src/H5Adeprec.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Module Info:	Datatype conversions for the H5T interface.
 */

/****************/
/* Module Setup */
/****************/

#include "H5Tmodule.h"          /* This source code file is part of the H5T module */


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5CXprivate.h"        /* API Contexts                         */
#include "H5Dprivate.h"		/* Datasets				*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5FLprivate.h"	/* Free Lists                           */
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5MMprivate.h"	/* Memory management			*/
#include "H5Pprivate.h"		/* Property lists			*/
#include "H5Tpkg.h"		/* Datatypes				*/


/****************/
/* Local Macros */
/****************/

/*
 * These macros are for the bodies of functions that convert buffers of one
 * atomic type to another using hardware.
 *
 * They all start with `H5T_CONV_' and end with two letters that represent the
 * source and destination types, respectively. The letters `s' and `S' refer to
 * signed integers while the letters `u' and `U' refer to unsigned integers, and
 * the letters `f' and `F' refer to floating-point values.
 *
 * The letter which is capitalized indicates that the corresponding type
 * (source or destination) is at least as large as the other type.
 *
 * Certain conversions may experience overflow conditions which arise when the
 * source value has a magnitude that cannot be represented by the destination
 * type.
 *
 * Suffix	Description
 * ------	-----------
 * sS:		Signed integers to signed integers where the destination is
 *		at least as wide as the source.	 This case cannot generate
 *		overflows.
 *
 * sU:		Signed integers to unsigned integers where the destination is
 *		at least as wide as the source.	 This case experiences
 *		overflows when the source value is negative.
 *
 * uS:		Unsigned integers to signed integers where the destination is
 *		at least as wide as the source.	 This case can experience
 *		overflows when the source and destination are the same size.
 *
 * uU:		Unsigned integers to unsigned integers where the destination
 *		is at least as wide as the source.  Overflows are not
 *		possible in this case.
 *
 * Ss:		Signed integers to signed integers where the source is at
 *		least as large as the destination.  Overflows can occur when
 *		the destination is narrower than the source.
 *
 * Su:		Signed integers to unsigned integers where the source is at
 *		least as large as the destination.  Overflows occur when the
 *		source value is negative and can also occur if the
 *		destination is narrower than the source.
 *
 * Us:		Unsigned integers to signed integers where the source is at
 *		least as large as the destination.  Overflows can occur for
 *		all sizes.
 *
 * Uu:		Unsigned integers to unsigned integers where the source is at
 *		least as large as the destination. Overflows can occur if the
 *		destination is narrower than the source.
 *
 * su:		Conversion from signed integers to unsigned integers where
 *		the source and destination are the same size. Overflow occurs
 *		when the source value is negative.
 *
 * us:		Conversion from unsigned integers to signed integers where
 *		the source and destination are the same size.  Overflow
 *		occurs when the source magnitude is too large for the
 *		destination.
 *
 * fF:		Floating-point values to floating-point values where the
 *              destination is at least as wide as the source.	 This case
 *              cannot generate overflows.
 *
 * Ff:		Floating-point values to floating-point values the source is at
 *		least as large as the destination.  Overflows can occur when
 *		the destination is narrower than the source.
 *
 * xF:          Integers to float-point(float or double) values where the destination
 *              is at least as wide as the source.  This case cannot generate
 *              overflows.
 *
 * Fx:          Float-point(float or double) values to integer where the source is
 *              at least as wide as the destination.  Overflow can occur
 *              when the source magnitude is too large for the destination.
 *
 * The macros take a subset of these arguments in the order listed here:
 *
 * CDATA:	A pointer to the H5T_cdata_t structure that was passed to the
 *		conversion function.
 *
 * STYPE:	The hid_t value for the source datatype.
 *
 * DTYPE:	The hid_t value for the destination datatype.
 *
 * BUF:		A pointer to the conversion buffer.
 *
 * NELMTS:	The number of values to be converted.
 *
 * ST:		The C name for source datatype (e.g., int)
 *
 * DT:		The C name for the destination datatype (e.g., signed char)
 *
 * D_MIN:	The minimum possible destination value.	 For unsigned
 *		destination types this should be zero.	For signed
 *		destination types it's a negative value with a magnitude that
 *		is usually one greater than D_MAX.  Source values which are
 *		smaller than D_MIN generate overflows.
 *
 * D_MAX:	The maximum possible destination value. Source values which
 *		are larger than D_MAX generate overflows.
 *
 * The macros are implemented with a generic programming technique, similar
 * to templates in C++.  The macro which defines the "core" part of the
 * conversion (which actually moves the data from the source to the destination)
 * is invoked inside the H5T_CONV "template" macro by "gluing" it together,
 * which allows the core conversion macro to be invoked as necessary.
 *
 * "Core" macros come in two flavors: one which calls the exception handling
 * routine and one which doesn't (the "_NOEX" variant).  The presence of the
 * exception handling routine is detected before the loop over the values and
 * the appropriate core routine loop is executed.
 *
 * The generic "core" macros are: (others are specific to particular conversion)
 *
 * Suffix	Description
 * ------	-----------
 * xX:		Generic Conversion where the destination is at least as
 *              wide as the source.  This case cannot generate overflows.
 *
 * Xx:		Generic signed conversion where the source is at least as large
 *              as the destination.  Overflows can occur when the destination is
 *              narrower than the source.
 *
 * Ux:		Generic conversion for the `Us', `Uu' & `us' cases
 *		Overflow occurs when the source magnitude is too large for the
 *		destination.
 *
 */
#define H5T_CONV_xX_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    *(D) = (DT)(*(S));							      \
}
#define H5T_CONV_xX_NOEX_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    *(D) = (DT)(*(S));							      \
}

/* Added a condition branch(else if (*(S) == (DT)(D_MAX))) which seems redundant.
 * It handles a special situation when the source is "float" and assigned the value
 * of "INT_MAX".  A compiler may do roundup making this value "INT_MAX+1".  However,
 * when do comparison "if (*(S) > (DT)(D_MAX))", the compiler may consider them
 * equal. In this case, do not return exception but make sure the maximum is assigned
 * to the destination.   SLU - 2005/06/29
 */
#define H5T_CONV_Xx_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    if (*(S) > (ST)(D_MAX)) {                                                 \
        H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI, \
                src_id, dst_id, S, D, cb_struct.user_data);                   \
        if(except_ret == H5T_CONV_UNHANDLED)                                  \
            /* Let compiler convert if case is ignored by user handler*/      \
            *(D) = (DT)(D_MAX);						      \
        else if(except_ret == H5T_CONV_ABORT)                                 \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception") \
        /* if(except_ret==H5T_CONV_HANDLED): Fall through, user handled it */ \
    } else if (*(S) < (ST)(D_MIN)) {                                          \
        H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_LOW, \
                src_id, dst_id, S, D, cb_struct.user_data);                   \
        if(except_ret == H5T_CONV_UNHANDLED)                                  \
            /* Let compiler convert if case is ignored by user handler*/      \
            *(D) = (DT)(D_MIN);						      \
        else if(except_ret == H5T_CONV_ABORT)                                 \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception") \
        /* if(except_ret==H5T_CONV_HANDLED): Fall through, user handled it */ \
    } else 								      \
        *(D) = (DT)(*(S));						      \
}
#define H5T_CONV_Xx_NOEX_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    if (*(S) > (ST)(D_MAX)) {                                                 \
        *(D) = (DT)(D_MAX);						      \
    } else if (*(S) < (ST)(D_MIN)) {                                          \
        *(D) = (DT)(D_MIN);						      \
    } else 								      \
        *(D) = (DT)(*(S));						      \
}

#define H5T_CONV_Ux_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    if (*(S) > (ST)(D_MAX)) {                                                 \
        H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI,               \
                src_id, dst_id, S, D, cb_struct.user_data);                   \
        if(except_ret == H5T_CONV_UNHANDLED)                                  \
            /* Let compiler convert if case is ignored by user handler*/      \
            *(D) = (DT)(D_MAX);						      \
        else if(except_ret == H5T_CONV_ABORT)                                 \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception") \
        /* if(except_ret==H5T_CONV_HANDLED): Fall through, user handled it */ \
    } else								      \
        *(D) = (DT)(*(S));						      \
}
#define H5T_CONV_Ux_NOEX_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    if (*(S) > (ST)(D_MAX)) {                                                 \
        *(D) = (DT)(D_MAX);						      \
    } else								      \
        *(D) = (DT)(*(S));						      \
}

#define H5T_CONV_sS(STYPE,DTYPE,ST,DT,D_MIN,D_MAX) {			      \
    HDcompile_assert(sizeof(ST)<=sizeof(DT));				      \
    H5T_CONV(H5T_CONV_xX, STYPE, DTYPE, ST, DT, D_MIN, D_MAX, N)              \
}

#define H5T_CONV_sU_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    if (*(S) < 0) {                                                           \
        H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_LOW,              \
                src_id, dst_id, S, D, cb_struct.user_data);                   \
        if(except_ret == H5T_CONV_UNHANDLED)                                  \
            /* Let compiler convert if case is ignored by user handler*/      \
            *(D) = 0;						              \
        else if(except_ret == H5T_CONV_ABORT)                                 \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception") \
        /* if(except_ret==H5T_CONV_HANDLED): Fall through, user handled it */ \
    } else								      \
        *(D) = (DT)(*(S));						      \
}
#define H5T_CONV_sU_NOEX_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    if(*(S) < 0)                                                              \
        *(D) = 0;						              \
    else								      \
        *(D) = (DT)(*(S));						      \
}

#define H5T_CONV_sU(STYPE,DTYPE,ST,DT,D_MIN,D_MAX) {			      \
    HDcompile_assert(sizeof(ST)<=sizeof(DT));				      \
    H5T_CONV(H5T_CONV_sU, STYPE, DTYPE, ST, DT, D_MIN, D_MAX, N)              \
}

/* Define to 1 if overflow is possible during conversion, 0 otherwise
 * Because destination is at least as wide as the source, this should only
 * occur between types of equal size */
#define H5T_CONV_uS_UCHAR_SHORT     0
#define H5T_CONV_uS_UCHAR_INT       0
#define H5T_CONV_uS_UCHAR_LONG      0
#define H5T_CONV_uS_UCHAR_LLONG     0
#if H5_SIZEOF_SHORT == H5_SIZEOF_INT
  #define H5T_CONV_uS_USHORT_INT    1
#else
  #define H5T_CONV_uS_USHORT_INT    0
#endif
#define H5T_CONV_uS_USHORT_LONG     0
#define H5T_CONV_uS_USHORT_LLONG    0
#if H5_SIZEOF_INT == H5_SIZEOF_LONG
  #define H5T_CONV_uS_UINT_LONG     1
#else
  #define H5T_CONV_uS_UINT_LONG     0
#endif
#define H5T_CONV_uS_UINT_LLONG      0
#if H5_SIZEOF_LONG == H5_SIZEOF_LONG_LONG
  #define H5T_CONV_uS_ULONG_LLONG   1
#else
  #define H5T_CONV_uS_ULONG_LLONG   0
#endif

/* Note. If an argument is stringified or concatenated, the prescan does not
 * occur. To expand the macro, then stringify or concatenate its expansion,
 * one macro must call another macro that does the stringification or
 * concatenation. */
#define H5T_CONV_uS_EVAL_TYPES(STYPE, DTYPE)                                  \
        H5_GLUE4(H5T_CONV_uS_, STYPE, _, DTYPE)

/* Called if overflow is possible */
#define H5T_CONV_uS_CORE_1(S, D, ST, DT, D_MIN, D_MAX)                        \
    if (*(S) > (DT)(D_MAX)) {                                                 \
        H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI,\
                src_id, dst_id, S, D, cb_struct.user_data);                   \
        if(except_ret == H5T_CONV_UNHANDLED)                                  \
            /* Let compiler convert if case is ignored by user handler */     \
            *(D) = (DT)(D_MAX);                                               \
        else if (except_ret == H5T_CONV_ABORT)                                \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL,                  \
                    "can't handle conversion exception")                      \
        /* if (except_ret==H5T_CONV_HANDLED): Fall through, user handled it */\
    } else                                                                    \
        *(D) = (DT)(*(S));

/* Called if no overflow is possible */
#define H5T_CONV_uS_CORE_0(S, D, ST, DT, D_MIN, D_MAX)                        \
    *(D) = (DT)(*(S));

#define H5T_CONV_uS_CORE_I(over, S, D, ST, DT, D_MIN, D_MAX)                  \
        H5_GLUE(H5T_CONV_uS_CORE_, over)(S, D, ST, DT, D_MIN, D_MAX)

#define H5T_CONV_uS_CORE(STYPE, DTYPE, S, D, ST, DT, D_MIN, D_MAX) {          \
        H5T_CONV_uS_CORE_I(H5T_CONV_uS_EVAL_TYPES(STYPE, DTYPE),              \
                S, D, ST, DT, D_MIN, D_MAX)                                   \
}

/* Called if overflow is possible */
#define H5T_CONV_uS_NOEX_CORE_1(S, D, ST, DT, D_MIN, D_MAX)                   \
    if (*(S) > (DT)(D_MAX))                                                   \
        *(D) = (D_MAX);                                                       \
    else                                                                      \
        *(D) = (DT)(*(S));

/* Called if no overflow is possible */
#define H5T_CONV_uS_NOEX_CORE_0(S, D, ST, DT, D_MIN, D_MAX)                   \
    *(D) = (DT)(*(S));

#define H5T_CONV_uS_NOEX_CORE_I(over, S, D, ST, DT, D_MIN, D_MAX)             \
        H5_GLUE(H5T_CONV_uS_NOEX_CORE_, over)(S, D, ST, DT, D_MIN, D_MAX)

#define H5T_CONV_uS_NOEX_CORE(STYPE, DTYPE, S, D, ST, DT, D_MIN, D_MAX) {     \
        H5T_CONV_uS_NOEX_CORE_I(H5T_CONV_uS_EVAL_TYPES(STYPE, DTYPE),         \
                S, D, ST, DT, D_MIN, D_MAX)                                   \
}

#define H5T_CONV_uS(STYPE, DTYPE, ST, DT, D_MIN, D_MAX) {                     \
    HDcompile_assert(sizeof(ST) <= sizeof(DT));                               \
    H5T_CONV(H5T_CONV_uS, STYPE, DTYPE, ST, DT, D_MIN, D_MAX, N)              \
}

#define H5T_CONV_uU(STYPE,DTYPE,ST,DT,D_MIN,D_MAX) {			      \
    HDcompile_assert(sizeof(ST)<=sizeof(DT));				      \
    H5T_CONV(H5T_CONV_xX, STYPE, DTYPE, ST, DT, D_MIN, D_MAX, N)              \
}

#define H5T_CONV_Ss(STYPE,DTYPE,ST,DT,D_MIN,D_MAX) {			      \
    HDcompile_assert(sizeof(ST)>=sizeof(DT));				      \
    H5T_CONV(H5T_CONV_Xx, STYPE, DTYPE, ST, DT, D_MIN, D_MAX, N)              \
}

#define H5T_CONV_Su_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    if(*(S) < 0) {                                                            \
        H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_LOW,              \
                src_id, dst_id, S, D, cb_struct.user_data);                   \
        if(except_ret == H5T_CONV_UNHANDLED)                                  \
            /* Let compiler convert if case is ignored by user handler*/      \
            *(D) = 0;						              \
        else if(except_ret == H5T_CONV_ABORT)                                 \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception") \
        /* if(except_ret==H5T_CONV_HANDLED): Fall through, user handled it */ \
    } else if (sizeof(ST)>sizeof(DT) && *(S) > (ST)(D_MAX)) {                 \
        H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI,               \
                src_id, dst_id, S, D, cb_struct.user_data);                   \
        if(except_ret == H5T_CONV_UNHANDLED)                                  \
            /* Let compiler convert if case is ignored by user handler*/      \
            *(D) = (DT)(D_MAX);						      \
        else if(except_ret == H5T_CONV_ABORT)                                 \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception") \
        /* if(except_ret==H5T_CONV_HANDLED): Fall through, user handled it */ \
    } else								      \
        *(D) = (DT)(*(S));						      \
}
#define H5T_CONV_Su_NOEX_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    if(*(S) < 0)                                                              \
        *(D) = 0;						              \
    else if (sizeof(ST)>sizeof(DT) && *(S) > (ST)(D_MAX))                     \
        *(D) = (DT)(D_MAX);						      \
    else								      \
        *(D) = (DT)(*(S));						      \
}

#define H5T_CONV_Su(STYPE,DTYPE,ST,DT,D_MIN,D_MAX) {			      \
    HDcompile_assert(sizeof(ST)>=sizeof(DT));				      \
    H5T_CONV(H5T_CONV_Su, STYPE, DTYPE, ST, DT, D_MIN, D_MAX, N)              \
}

#define H5T_CONV_Us(STYPE,DTYPE,ST,DT,D_MIN,D_MAX) {			      \
    HDcompile_assert(sizeof(ST)>=sizeof(DT));				      \
    H5T_CONV(H5T_CONV_Ux, STYPE, DTYPE, ST, DT, D_MIN, D_MAX, N)              \
}

#define H5T_CONV_Uu(STYPE,DTYPE,ST,DT,D_MIN,D_MAX) {			      \
    HDcompile_assert(sizeof(ST)>=sizeof(DT));				      \
    H5T_CONV(H5T_CONV_Ux, STYPE, DTYPE, ST, DT, D_MIN, D_MAX, N)              \
}

#define H5T_CONV_su_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    /* Assumes memory format of unsigned & signed integers is same */	      \
    if(*(S) < 0) {                                                            \
        H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_LOW,              \
                src_id, dst_id, S, D, cb_struct.user_data);                   \
        if(except_ret == H5T_CONV_UNHANDLED)                                  \
            /* Let compiler convert if case is ignored by user handler*/      \
            *(D) = 0;						              \
        else if(except_ret == H5T_CONV_ABORT)                                 \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception") \
        /* if(except_ret==H5T_CONV_HANDLED): Fall through, user handled it */ \
    } else								      \
        *(D) = (DT)(*(S));						      \
}
#define H5T_CONV_su_NOEX_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    /* Assumes memory format of unsigned & signed integers is same */	      \
    if(*(S) < 0)                                                              \
        *(D) = 0;						              \
    else								      \
        *(D) = (DT)(*(S));						      \
}

#define H5T_CONV_su(STYPE,DTYPE,ST,DT,D_MIN,D_MAX) {			      \
    HDcompile_assert(sizeof(ST)==sizeof(DT));				      \
    H5T_CONV(H5T_CONV_su, STYPE, DTYPE, ST, DT, D_MIN, D_MAX, N)              \
}

#define H5T_CONV_us_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    /* Assumes memory format of unsigned & signed integers is same */	      \
    if (*(S) > (ST)(D_MAX)) {                                                 \
        H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI,               \
                src_id, dst_id, S, D, cb_struct.user_data);                   \
        if(except_ret == H5T_CONV_UNHANDLED)                                  \
            /* Let compiler convert if case is ignored by user handler*/      \
            *(D) = (DT)(D_MAX);						      \
        else if(except_ret == H5T_CONV_ABORT)                                 \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception") \
        /* if(except_ret==H5T_CONV_HANDLED): Fall through, user handled it */ \
    } else								      \
        *(D) = (DT)(*(S));						      \
}
#define H5T_CONV_us_NOEX_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    /* Assumes memory format of unsigned & signed integers is same */	      \
    if(*(S) > (ST)(D_MAX))                                                    \
        *(D) = (DT)(D_MAX);						      \
    else								      \
        *(D) = (DT)(*(S));						      \
}

#define H5T_CONV_us(STYPE,DTYPE,ST,DT,D_MIN,D_MAX) {			      \
    HDcompile_assert(sizeof(ST)==sizeof(DT));				      \
    H5T_CONV(H5T_CONV_us, STYPE, DTYPE, ST, DT, D_MIN, D_MAX, N)              \
}

#define H5T_CONV_fF(STYPE,DTYPE,ST,DT,D_MIN,D_MAX) {			      \
    HDcompile_assert(sizeof(ST)<=sizeof(DT));				      \
    H5T_CONV(H5T_CONV_xX, STYPE, DTYPE, ST, DT, D_MIN, D_MAX, N)              \
}

/* Same as H5T_CONV_Xx_CORE, except that instead of using D_MAX and D_MIN
 * when an overflow occurs, use the 'float' infinity values.
 */
#define H5T_CONV_Ff_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    if(*(S) > (ST)(D_MAX)) {                                                  \
        H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI,               \
                src_id, dst_id, S, D, cb_struct.user_data);                   \
        if(except_ret == H5T_CONV_UNHANDLED)                                  \
            /* Let compiler convert if case is ignored by user handler*/      \
            *(D) = (H5T_NATIVE_FLOAT_POS_INF_g);		              \
        else if(except_ret == H5T_CONV_ABORT)                                 \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception") \
        /* if(except_ret==H5T_CONV_HANDLED): Fall through, user handled it */ \
    } else if (*(S) < (ST)(D_MIN)) {                                          \
        H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_LOW,              \
                src_id, dst_id, S, D, cb_struct.user_data);                   \
        if(except_ret == H5T_CONV_UNHANDLED)                                  \
            /* Let compiler convert if case is ignored by user handler*/      \
            *(D) = (H5T_NATIVE_FLOAT_NEG_INF_g);		              \
        else if(except_ret == H5T_CONV_ABORT)                                 \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception") \
        /* if(except_ret==H5T_CONV_HANDLED): Fall through, user handled it */ \
    } else								      \
        *(D) = (DT)(*(S));						      \
}
#define H5T_CONV_Ff_NOEX_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    if(*(S) > (ST)(D_MAX))                                                    \
        *(D) = (H5T_NATIVE_FLOAT_POS_INF_g);		                      \
    else if (*(S) < (ST)(D_MIN))                                              \
        *(D) = (H5T_NATIVE_FLOAT_NEG_INF_g);		                      \
    else								      \
        *(D) = (DT)(*(S));					              \
}

#define H5T_CONV_Ff(STYPE,DTYPE,ST,DT,D_MIN,D_MAX) {			      \
    HDcompile_assert(sizeof(ST)>=sizeof(DT));				      \
    H5T_CONV(H5T_CONV_Ff, STYPE, DTYPE, ST, DT, D_MIN, D_MAX, N)              \
}

#define H5T_HI_LO_BIT_SET(TYP, V, LO, HI) {                                   \
    unsigned count;                                                           \
    unsigned char p;                                                          \
    unsigned u;                                                               \
                                                                              \
    count = 0;                                                                \
    for(u = 0; u < sizeof(TYP); u++) {                                        \
        count = (((unsigned)sizeof(TYP) - 1) - u) * 8;                        \
        p = (unsigned char)((V) >> count);                                    \
        if(p > 0) {                                                           \
            if(p & 0x80)                                                      \
                count += 7;                                                   \
            else if(p & 0x40)                                                 \
                count += 6;                                                   \
            else if(p & 0x20)                                                 \
                count += 5;                                                   \
            else if(p & 0x10)                                                 \
                count += 4;                                                   \
            else if(p & 0x08)                                                 \
                count += 3;                                                   \
            else if(p & 0x04)                                                 \
                count += 2;                                                   \
            else if(p & 0x02)                                                 \
                count += 1;                                                   \
            break;                                                            \
        } /* end if */                                                        \
    } /* end for */                                                           \
                                                                              \
    HI = count;                                                               \
                                                                              \
    count = 0;                                                                \
    for(u = 0; u < sizeof(TYP); u++) {                                        \
        p = (unsigned char)((V) >> (u * 8));                                  \
        if(p > 0) {                                                           \
            count = u * 8;                                                    \
                                                                              \
            if(p & 0x01)                                                      \
                ;                                                             \
            else if(p & 0x02)                                                 \
                count += 1;                                                   \
            else if(p & 0x04)                                                 \
                count += 2;                                                   \
            else if(p & 0x08)                                                 \
                count += 3;                                                   \
            else if(p & 0x10)                                                 \
                count += 4;                                                   \
            else if(p & 0x20)                                                 \
                count += 5;                                                   \
            else if(p & 0x40)                                                 \
                count += 6;                                                   \
            else if(p & 0x80)                                                 \
                count += 7;                                                   \
            break;                                                            \
        } /* end if */                                                        \
    } /* end for */                                                           \
                                                                              \
    LO = count;                                                               \
}

#define H5T_CONV_xF_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    if (sprec > dprec) {						      \
        unsigned low_bit_pos, high_bit_pos;                                   \
                                                                              \
        /* Detect high & low bits set in source */                            \
        H5T_HI_LO_BIT_SET(ST, *(S), low_bit_pos, high_bit_pos)                \
                                                                              \
        /* Check for more bits of precision in src than available in dst */   \
        if((high_bit_pos - low_bit_pos) >= dprec) {			      \
            H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_PRECISION,          \
                    src_id, dst_id, S, D, cb_struct.user_data);               \
            if(except_ret == H5T_CONV_UNHANDLED)                              \
                /* Let compiler convert if case is ignored by user handler*/  \
                *(D) = (DT)(*(S));					      \
            else if(except_ret == H5T_CONV_ABORT)                             \
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception") \
            /* if(except_ret==H5T_CONV_HANDLED): Fall through, user handled it */ \
        }        							      \
        else                                                                  \
            *(D) = (DT)(*(S));						      \
    }        								      \
    else                                                                      \
        *(D) = (DT)(*(S));						      \
}
#define H5T_CONV_xF_NOEX_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    *(D) = (DT)(*(S));							      \
}

#define H5T_CONV_xF(STYPE,DTYPE,ST,DT,D_MIN,D_MAX) {			      \
    H5T_CONV(H5T_CONV_xF, STYPE, DTYPE, ST, DT, D_MIN, D_MAX, Y)                 \
}

/* Quincey added the condition branch (else if (*(S) != (ST)((DT)(*(S))))).
 * It handles a special situation when the source is "float" and assigned the value
 * of "INT_MAX".  Compilers do roundup making this value "INT_MAX+1".  This branch
 * is to check that situation and return exception for some compilers, mainly GCC.
 * The branch if (*(S) > (DT)(D_MAX) || (sprec < dprec && *(S) ==
 * (ST)(D_MAX))) is for some compilers like Sun, HP, IBM, and SGI where under
 * the same situation the "int" doesn't overflow.  SLU - 2005/9/12
 */
#define H5T_CONV_Fx_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    if(*(S) > (ST)(D_MAX) || (sprec < dprec && *(S) == (ST)(D_MAX))) {        \
        H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI, \
                src_id, dst_id, S, D, cb_struct.user_data);                   \
        if(except_ret == H5T_CONV_UNHANDLED)                                  \
            /* Let compiler convert if case is ignored by user handler*/      \
            *(D) = (DT)(D_MAX);						      \
        else if(except_ret == H5T_CONV_ABORT)                                 \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception") \
        /* if(except_ret==H5T_CONV_HANDLED): Fall through, user handled it */ \
    } else if (*(S) < (ST)(D_MIN)) {                                          \
        H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_LOW, \
                src_id, dst_id, S, D, cb_struct.user_data);                   \
        if(except_ret == H5T_CONV_UNHANDLED)                                  \
            /* Let compiler convert if case is ignored by user handler*/      \
            *(D) = (DT)(D_MIN);						      \
        else if(except_ret == H5T_CONV_ABORT)                                 \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception") \
        /* if(except_ret==H5T_CONV_HANDLED): Fall through, user handled it */ \
    } else if (*(S) != (ST)((DT)(*(S)))) {                                    \
        H5T_conv_ret_t except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_TRUNCATE, \
                src_id, dst_id, S, D, cb_struct.user_data);                   \
        if(except_ret == H5T_CONV_UNHANDLED)                                  \
            /* Let compiler convert if case is ignored by user handler*/      \
            *(D) = (DT)(*(S));						      \
        else if(except_ret == H5T_CONV_ABORT)                                 \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception") \
        /* if(except_ret==H5T_CONV_HANDLED): Fall through, user handled it */ \
    }        								      \
    else                                                                      \
        *(D) = (DT)(*(S));						      \
}
#define H5T_CONV_Fx_NOEX_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {			      \
    if(*(S) > (ST)(D_MAX))                                                    \
        *(D) = (DT)(D_MAX);						      \
    else if(*(S) < (ST)(D_MIN))                                               \
        *(D) = (DT)(D_MIN);						      \
    else                                                                      \
        *(D) = (DT)(*(S));					              \
}

#define H5T_CONV_Fx(STYPE,DTYPE,ST,DT,D_MIN,D_MAX) {			      \
    H5T_CONV(H5T_CONV_Fx, STYPE, DTYPE, ST, DT, D_MIN, D_MAX, Y)              \
}

/* Since all "no exception" cores do the same thing (assign the value in the
 * source location to the destination location, using casting), use one "core"
 * to do them all.
 */
#ifndef H5_WANT_DCONV_EXCEPTION
#define H5T_CONV_NO_EXCEPT_CORE(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) {		      \
    *(D) = (DT)(*(S));		        				      \
}
#endif /* H5_WANT_DCONV_EXCEPTION */


/* The main part of every integer hardware conversion macro */
#define H5T_CONV(GUTS,STYPE,DTYPE,ST,DT,D_MIN,D_MAX,PREC)  		      \
{                                                                             \
    herr_t      ret_value=SUCCEED;      /* Return value         */            \
                                                                              \
    FUNC_ENTER_PACKAGE                                                        \
                                                                              \
{                                                                             \
    size_t	elmtno;			/*element number		*/    \
    H5T_CONV_DECL_PREC(PREC)            /*declare precision variables, or not */ \
    void        *src_buf;		/*'raw' source buffer		*/    \
    void        *dst_buf;		/*'raw' destination buffer	*/    \
    ST	*src, *s;			/*source buffer			*/    \
    DT	*dst, *d;			/*destination buffer		*/    \
    H5T_t	*st, *dt;		/*datatype descriptors		*/    \
    ST	src_aligned;			/*source aligned type		*/    \
    DT	dst_aligned;			/*destination aligned type	*/    \
    hbool_t	s_mv, d_mv;		/*move data to align it?	*/    \
    ssize_t	s_stride, d_stride;	/*src and dst strides		*/    \
    size_t      safe;                   /*how many elements are safe to process in each pass */ \
    H5T_conv_cb_t       cb_struct;      /*conversion callback structure */    \
                                                                              \
    switch (cdata->command) {						      \
    case H5T_CONV_INIT:							      \
	/* Sanity check and initialize statistics */			      \
	cdata->need_bkg = H5T_BKG_NO;					      \
        if (NULL==(st=(H5T_t*)H5I_object(src_id)) || NULL==(dt=(H5T_t*)H5I_object(dst_id)))   \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL,		      \
                          "unable to dereference datatype object ID")	      \
	if (st->shared->size!=sizeof(ST) || dt->shared->size!=sizeof(DT))     \
	    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL,		      \
			  "disagreement about datatype size")		      \
	CI_ALLOC_PRIV	                                                      \
	break;								      \
									      \
    case H5T_CONV_FREE:							      \
	/* Print and free statistics */					      \
	CI_PRINT_STATS(STYPE,DTYPE);					      \
	CI_FREE_PRIV	                                                      \
	break;								      \
									      \
    case H5T_CONV_CONV:							      \
	/* Initialize source & destination strides */			      \
	if (buf_stride) {						      \
            HDassert(buf_stride >= sizeof(ST));				      \
            HDassert(buf_stride >= sizeof(DT));				      \
	    s_stride = d_stride = (ssize_t)buf_stride;			      \
	} else {							      \
            s_stride = sizeof(ST);					      \
            d_stride = sizeof(DT);					      \
        }								      \
									      \
	/* Is alignment required for source or dest? */			      \
	s_mv = H5T_NATIVE_##STYPE##_ALIGN_g>1 &&			      \
               ((size_t)buf%H5T_NATIVE_##STYPE##_ALIGN_g ||		      \
     /* Cray */ ((size_t)((ST*)buf)!=(size_t)buf) ||			      \
		(size_t)s_stride%H5T_NATIVE_##STYPE##_ALIGN_g);			      \
	d_mv = H5T_NATIVE_##DTYPE##_ALIGN_g>1 &&			      \
               ((size_t)buf%H5T_NATIVE_##DTYPE##_ALIGN_g ||		      \
     /* Cray */ ((size_t)((DT*)buf)!=(size_t)buf) ||			      \
                (size_t)d_stride%H5T_NATIVE_##DTYPE##_ALIGN_g);			      \
	CI_INC_SRC(s_mv)						      \
	CI_INC_DST(d_mv)						      \
	                                                                      \
        /* Get conversion exception callback property */                      \
        if(H5CX_get_dt_conv_cb(&cb_struct) < 0)                               \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "unable to get conversion exception callback") \
                                                                              \
        /* Get source and destination datatypes */			      \
        if(NULL == (st = (H5T_t *)H5I_object(src_id)) || NULL == (dt = (H5T_t *)H5I_object(dst_id))) \
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to dereference datatype object ID") \
									      \
        H5T_CONV_SET_PREC(PREC)            /*init precision variables, or not */ \
                                                                              \
        /* The outer loop of the type conversion macro, controlling which */  \
        /* direction the buffer is walked */				      \
        while (nelmts>0) {						      \
            /* Check if we need to go backwards through the buffer */	      \
            if(d_stride>s_stride) {					      \
                /* Compute the number of "safe" destination elements at */    \
                /* the end of the buffer (Those which don't overlap with */   \
                /* any source elements at the beginning of the buffer) */     \
                safe = nelmts - (((nelmts * (size_t)s_stride) + (size_t)(d_stride - 1)) / (size_t)d_stride);      \
									      \
                /* If we're down to the last few elements, just wrap up */    \
                /* with a "real" reverse copy */			      \
                if(safe<2) {						      \
                    src = (ST *)(src_buf = (void *)((uint8_t *)buf + (nelmts - 1) * (size_t)s_stride)); \
                    dst = (DT *)(dst_buf = (void *)((uint8_t *)buf + (nelmts - 1) * (size_t)d_stride)); \
                    s_stride = -s_stride;				      \
                    d_stride = -d_stride;				      \
									      \
                    safe=nelmts;					      \
                } /* end if */						      \
                else {							      \
                    src = (ST *)(src_buf = (void *)((uint8_t *)buf + (nelmts - safe) * (size_t)s_stride)); \
                    dst = (DT *)(dst_buf = (void *)((uint8_t *)buf + (nelmts - safe) * (size_t)d_stride)); \
                } /* end else */					      \
            } /* end if */						      \
            else {							      \
                /* Single forward pass over all data */			      \
                src = (ST *)(src_buf = buf);			              \
                dst = (DT *)(dst_buf = buf);			              \
                safe=nelmts;						      \
            } /* end else */						      \
                                                                              \
            /* Perform loop over elements to convert */			      \
            if (s_mv && d_mv) {						      \
                /* Alignment is required for both source and dest */	      \
                s = &src_aligned;					      \
                H5T_CONV_LOOP_OUTER(PRE_SALIGN,PRE_DALIGN,POST_SALIGN,POST_DALIGN,GUTS,STYPE,DTYPE,s,d,ST,DT,D_MIN,D_MAX) \
            } else if(s_mv) {						      \
                /* Alignment is required only for source */		      \
                s = &src_aligned;					      \
                H5T_CONV_LOOP_OUTER(PRE_SALIGN,PRE_DNOALIGN,POST_SALIGN,POST_DNOALIGN,GUTS,STYPE,DTYPE,s,dst,ST,DT,D_MIN,D_MAX) \
            } else if(d_mv) {						      \
                /* Alignment is required only for destination */	      \
                H5T_CONV_LOOP_OUTER(PRE_SNOALIGN,PRE_DALIGN,POST_SNOALIGN,POST_DALIGN,GUTS,STYPE,DTYPE,src,d,ST,DT,D_MIN,D_MAX) \
            } else {							      \
                /* Alignment is not required for both source and destination */ \
                H5T_CONV_LOOP_OUTER(PRE_SNOALIGN,PRE_DNOALIGN,POST_SNOALIGN,POST_DNOALIGN,GUTS,STYPE,DTYPE,src,dst,ST,DT,D_MIN,D_MAX) \
            }	 	 	 	 	 	 	 	      \
									      \
            /* Decrement number of elements left to convert */		      \
            nelmts-=safe;						      \
        } /* end while */						      \
        break;								      \
									      \
    default:								      \
	HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL,		      \
		      "unknown conversion command");			      \
    }									      \
}                                                                             \
									      \
done:                                                                         \
    FUNC_LEAVE_NOAPI(ret_value)                                               \
}

/* Declare the source & destination precision variables */
#define H5T_CONV_DECL_PREC(PREC) H5_GLUE(H5T_CONV_DECL_PREC_, PREC)

#define H5T_CONV_DECL_PREC_Y                                                  \
    size_t	sprec;			/*source precision		*/    \
    size_t	dprec;			/*destination precision		*/    \
    H5T_class_t tclass;                 /*datatype's class		*/

#define H5T_CONV_DECL_PREC_N            /*no precision variables        */

/* Initialize the source & destination precision variables */
#define H5T_CONV_SET_PREC(PREC) H5_GLUE(H5T_CONV_SET_PREC_, PREC)

#define H5T_CONV_SET_PREC_Y                                                   \
        /* Get source & destination precisions into a variable */	      \
        tclass = st->shared->type;					      \
        HDassert(tclass == H5T_INTEGER || tclass == H5T_FLOAT);		      \
        if(tclass == H5T_INTEGER)					      \
            sprec = st->shared->u.atomic.prec;				      \
        else								      \
            sprec = 1 + st->shared->u.atomic.u.f.msize;			      \
        tclass = dt->shared->type;					      \
        HDassert(tclass == H5T_INTEGER || tclass == H5T_FLOAT);		      \
        if(tclass == H5T_INTEGER)					      \
            dprec = dt->shared->u.atomic.prec;				      \
        else								      \
            dprec = 1 + dt->shared->u.atomic.u.f.msize;

#define H5T_CONV_SET_PREC_N             /*don't init precision variables */

/* Macro defining action on source data which needs to be aligned (before main action) */
#define H5T_CONV_LOOP_PRE_SALIGN(ST) {					      \
    H5MM_memcpy(&src_aligned, src, sizeof(ST));				      \
}

/* Macro defining action on source data which doesn't need to be aligned (before main action) */
#define H5T_CONV_LOOP_PRE_SNOALIGN(ST) {				      \
}

/* Macro defining action on destination data which needs to be aligned (before main action) */
#define H5T_CONV_LOOP_PRE_DALIGN(DT) {					      \
    d = &dst_aligned;							      \
}

/* Macro defining action on destination data which doesn't need to be aligned (before main action) */
#define H5T_CONV_LOOP_PRE_DNOALIGN(DT) {				      \
}

/* Macro defining action on source data which needs to be aligned (after main action) */
#define H5T_CONV_LOOP_POST_SALIGN(ST) {					      \
}

/* Macro defining action on source data which doesn't need to be aligned (after main action) */
#define H5T_CONV_LOOP_POST_SNOALIGN(ST) {				      \
}

/* Macro defining action on destination data which needs to be aligned (after main action) */
#define H5T_CONV_LOOP_POST_DALIGN(DT) {					      \
    H5MM_memcpy(dst, &dst_aligned, sizeof(DT));				      \
}

/* Macro defining action on destination data which doesn't need to be aligned (after main action) */
#define H5T_CONV_LOOP_POST_DNOALIGN(DT) {				      \
}

/* The outer wrapper for the type conversion loop, to check for an exception handling routine */
#define H5T_CONV_LOOP_OUTER(PRE_SALIGN_GUTS,PRE_DALIGN_GUTS,POST_SALIGN_GUTS,POST_DALIGN_GUTS,GUTS,STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) \
    if(cb_struct.func) {			                              \
        H5T_CONV_LOOP(PRE_SALIGN_GUTS,PRE_DALIGN_GUTS,POST_SALIGN_GUTS,POST_DALIGN_GUTS,GUTS,STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) \
    }                                                                         \
    else {                                                                    \
        H5T_CONV_LOOP(PRE_SALIGN_GUTS,PRE_DALIGN_GUTS,POST_SALIGN_GUTS,POST_DALIGN_GUTS,H5_GLUE(GUTS,_NOEX),STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) \
    }

/* The inner loop of the type conversion macro, actually converting the elements */
#define H5T_CONV_LOOP(PRE_SALIGN_GUTS,PRE_DALIGN_GUTS,POST_SALIGN_GUTS,POST_DALIGN_GUTS,GUTS,STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX) \
    for (elmtno=0; elmtno<safe; elmtno++) {				      \
        /* Handle source pre-alignment */				      \
        H5_GLUE(H5T_CONV_LOOP_,PRE_SALIGN_GUTS)(ST)			      \
                                                                              \
        /* Handle destination pre-alignment */				      \
        H5_GLUE(H5T_CONV_LOOP_,PRE_DALIGN_GUTS)(DT)			      \
                                                                              \
        /* ... user-defined stuff here -- the conversion ... */		      \
        H5T_CONV_LOOP_GUTS(GUTS,STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX)			      \
                                                                              \
        /* Handle source post-alignment */				      \
        H5_GLUE(H5T_CONV_LOOP_,POST_SALIGN_GUTS)(ST)			      \
                                                                              \
        /* Handle destination post-alignment */				      \
        H5_GLUE(H5T_CONV_LOOP_,POST_DALIGN_GUTS)(DT)			      \
                                                                              \
        /* Advance pointers */						      \
        src_buf = (void *)((uint8_t *)src_buf + s_stride);		      \
        src = (ST *)src_buf;						      \
        dst_buf = (void *)((uint8_t *)dst_buf + d_stride);		      \
        dst = (DT *)dst_buf;						      \
    }

/* Macro to call the actual "guts" of the type conversion, or call the "no exception" guts */
#ifdef H5_WANT_DCONV_EXCEPTION
#define H5T_CONV_LOOP_GUTS(GUTS,STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX)			      \
        /* ... user-defined stuff here -- the conversion ... */		      \
        H5_GLUE(GUTS,_CORE)(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX)
#else /* H5_WANT_DCONV_EXCEPTION */
#define H5T_CONV_LOOP_GUTS(GUTS,STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX)			      \
        H5_GLUE(H5T_CONV_NO_EXCEPT,_CORE)(STYPE,DTYPE,S,D,ST,DT,D_MIN,D_MAX)
#endif /* H5_WANT_DCONV_EXCEPTION */


#ifdef H5T_DEBUG

/* Print alignment statistics */
#   define CI_PRINT_STATS(STYPE,DTYPE) {				      \
    if (H5DEBUG(T) && ((H5T_conv_hw_t *)cdata->priv)->s_aligned) {	      \
	HDfprintf(H5DEBUG(T),						      \
		  "      %Hu src elements aligned on %lu-byte boundaries\n",  \
		  ((H5T_conv_hw_t *)cdata->priv)->s_aligned,		      \
		  (unsigned long)H5T_NATIVE_##STYPE##_ALIGN_g);		      \
    }									      \
    if (H5DEBUG(T) && ((H5T_conv_hw_t *)cdata->priv)->d_aligned) {	      \
	HDfprintf(H5DEBUG(T),						      \
		  "      %Hu dst elements aligned on %lu-byte boundaries\n",  \
		  ((H5T_conv_hw_t *)cdata->priv)->d_aligned,		      \
		  (unsigned long)H5T_NATIVE_##DTYPE##_ALIGN_g);		      \
    }									      \
}

/* Allocate private alignment structure for atomic types */
#   define CI_ALLOC_PRIV \
	if (NULL==(cdata->priv=H5MM_calloc(sizeof(H5T_conv_hw_t)))) {	      \
	    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,		      \
			  "memory allocation failed");			      \
	}

/* Free private alignment structure for atomic types */
#   define CI_FREE_PRIV                                 \
    if(cdata->priv!=NULL)                               \
        cdata->priv = H5MM_xfree(cdata->priv);

/* Increment source alignment counter */
#   define CI_INC_SRC(s)   if (s) ((H5T_conv_hw_t *)cdata->priv)->s_aligned += nelmts;

/* Increment destination alignment counter */
#   define CI_INC_DST(d)   if (d) ((H5T_conv_hw_t *)cdata->priv)->d_aligned += nelmts;
#else /* H5T_DEBUG */
#   define CI_PRINT_STATS(STYPE,DTYPE) /*void*/
#   define CI_ALLOC_PRIV cdata->priv=NULL;
#   define CI_FREE_PRIV  /* void */
#   define CI_INC_SRC(s) /* void */
#   define CI_INC_DST(d) /* void */
#endif /* H5T_DEBUG */

/* Swap two elements (I & J) of an array using a temporary variable */
#define H5_SWAP_BYTES(ARRAY,I,J) {uint8_t _tmp; _tmp=ARRAY[I]; ARRAY[I]=ARRAY[J]; ARRAY[J]=_tmp;}

/* Minimum size of variable-length conversion buffer */
#define H5T_VLEN_MIN_CONF_BUF_SIZE      4096

/******************/
/* Local Typedefs */
/******************/

/* Conversion data for H5T__conv_struct() */
typedef struct H5T_conv_struct_t {
    int	*src2dst;		/*mapping from src to dst member num */
    hid_t	*src_memb_id;		/*source member type ID's	     */
    hid_t	*dst_memb_id;		/*destination member type ID's	     */
    H5T_path_t	**memb_path;		/*conversion path for each member    */
    H5T_subset_info_t   subset_info;    /*info related to compound subsets   */
    unsigned            src_nmembs;     /*needed by free function            */
} H5T_conv_struct_t;

/* Conversion data for H5T__conv_enum() */
typedef struct H5T_enum_struct_t {
    int	base;			/*lowest `in' value		     */
    unsigned length;		/*num elements in arrays	     */
    int	*src2dst;		/*map from src to dst index	     */
} H5T_enum_struct_t;

/* Conversion data for the hardware conversion functions */
typedef struct H5T_conv_hw_t {
    size_t	s_aligned;		/*number source elements aligned     */
    size_t	d_aligned;		/*number destination elements aligned*/
} H5T_conv_hw_t;

/********************/
/* Package Typedefs */
/********************/


/********************/
/* Local Prototypes */
/********************/

static herr_t H5T_reverse_order(uint8_t *rev, uint8_t *s, size_t size, H5T_order_t order);


/*********************/
/* Public Variables */
/*********************/


/*********************/
/* Package Variables */
/*********************/


/*****************************/
/* Library Private Variables */
/*****************************/


/*******************/
/* Local Variables */
/*******************/

/* Declare a free list to manage pieces of vlen data */
H5FL_BLK_DEFINE_STATIC(vlen_seq);

/* Declare a free list to manage pieces of array data */
H5FL_BLK_DEFINE_STATIC(array_seq);

/* Declare a free list to manage pieces of reference data */
H5FL_BLK_DEFINE_STATIC(ref_seq);


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_noop
 *
 * Purpose:	The no-op conversion.  The library knows about this
 *		conversion without it being registered.
 *
 * Return: 	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Wednesday, January 14, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_noop(hid_t H5_ATTR_UNUSED src_id, hid_t H5_ATTR_UNUSED dst_id, H5T_cdata_t *cdata,
    size_t H5_ATTR_UNUSED nelmts, size_t H5_ATTR_UNUSED buf_stride,
    size_t H5_ATTR_UNUSED bkg_stride, void H5_ATTR_UNUSED *buf,
    void H5_ATTR_UNUSED *background)
{
    herr_t      ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            cdata->need_bkg = H5T_BKG_NO;
            break;

        case H5T_CONV_CONV:
            /* Nothing to convert */
            break;

        case H5T_CONV_FREE:
            break;

        default:
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    } /* end switch */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_noop() */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_order_opt
 *
 * Purpose:	Convert one type to another when byte order is the only
 *		difference. This is the optimized version of H5T__conv_order()
 *              for a handful of different sizes.
 *
 * Note:	This is a soft conversion function.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Friday, January 25, 2002
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_order_opt(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
                   size_t nelmts, size_t buf_stride,
                   size_t H5_ATTR_UNUSED bkg_stride, void *_buf,
                   void H5_ATTR_UNUSED *background)
{
    uint8_t	*buf = (uint8_t*)_buf;
    H5T_t	*src = NULL;
    H5T_t	*dst = NULL;
    size_t      i;
    herr_t      ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            /* Capability query */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
            if(src->shared->size != dst->shared->size ||
                    0 != src->shared->u.atomic.offset ||
                    0 != dst->shared->u.atomic.offset)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "conversion not supported")
            if((src->shared->type == H5T_REFERENCE && dst->shared->type != H5T_REFERENCE) ||
                    (dst->shared->type == H5T_REFERENCE && src->shared->type != H5T_REFERENCE))
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "conversion not supported")
            if(src->shared->type != H5T_REFERENCE &&
                    !((H5T_ORDER_BE == src->shared->u.atomic.order && H5T_ORDER_LE == dst->shared->u.atomic.order) ||
                      (H5T_ORDER_LE == src->shared->u.atomic.order && H5T_ORDER_BE == dst->shared->u.atomic.order)))
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "conversion not supported")
            if(src->shared->size != 1 && src->shared->size != 2 && src->shared->size != 4 &&
                    src->shared->size != 8 && src->shared->size != 16)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "conversion not supported")
            switch(src->shared->type) {
                case H5T_INTEGER:
                case H5T_BITFIELD:
                case H5T_REFERENCE:
                    /* nothing to check */
                    break;

                case H5T_FLOAT:
                    if(src->shared->u.atomic.u.f.sign != dst->shared->u.atomic.u.f.sign ||
                            src->shared->u.atomic.u.f.epos != dst->shared->u.atomic.u.f.epos ||
                            src->shared->u.atomic.u.f.esize != dst->shared->u.atomic.u.f.esize ||
                            src->shared->u.atomic.u.f.ebias != dst->shared->u.atomic.u.f.ebias ||
                            src->shared->u.atomic.u.f.mpos != dst->shared->u.atomic.u.f.mpos ||
                            src->shared->u.atomic.u.f.msize != dst->shared->u.atomic.u.f.msize ||
                            src->shared->u.atomic.u.f.norm != dst->shared->u.atomic.u.f.norm ||
                            src->shared->u.atomic.u.f.pad != dst->shared->u.atomic.u.f.pad)
                        HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "conversion not supported")
                    break;

                case H5T_NO_CLASS:
                case H5T_TIME:
                case H5T_STRING:
                case H5T_OPAQUE:
                case H5T_COMPOUND:
                case H5T_ENUM:
                case H5T_VLEN:
                case H5T_ARRAY:
                case H5T_NCLASSES:
                default:
                    HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "conversion not supported")
            }
            cdata->need_bkg = H5T_BKG_NO;
            break;

        case H5T_CONV_CONV:
            /* The conversion */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")

            /* Check for "no op" reference conversion */
            if(src->shared->type == H5T_REFERENCE) {
                /* Sanity check */
                if(dst->shared->type != H5T_REFERENCE)
                    HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a H5T_REFERENCE datatype")

                /* Check if we are on a little-endian machine (the order that
                 * the addresses in the file must be) and just get out now, there
                 * is no need to convert the object reference.  Yes, this is
                 * icky and non-portable, but I can't think of a better way to
                 * support allowing the objno in the H5O_info_t struct and the
                 * hobj_ref_t type to be compared directly without introducing a
                 * "native" hobj_ref_t datatype and I think that would break a
                 * lot of existing programs.  -QAK
                 */
                if(H5T_native_order_g == H5T_ORDER_LE)
                    break;
            } /* end if */

            buf_stride = buf_stride ? buf_stride : src->shared->size;
            switch(src->shared->size) {
                case 1:
                    /*no-op*/
                    break;

                case 2:
                    for(/*void*/; nelmts >= 20; nelmts -= 20) {
                        H5_SWAP_BYTES(buf, 0,   1); /*  0 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /*  1 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /*  2 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /*  3 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /*  4 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /*  5 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /*  6 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /*  7 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /*  8 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /*  9 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /* 10 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /* 11 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /* 12 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /* 13 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /* 14 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /* 15 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /* 16 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /* 17 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /* 18 */
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf, 0,   1); /* 19 */
                        buf += buf_stride;
                    } /* end for */
                    for(i = 0; i < nelmts; i++, buf += buf_stride)
                        H5_SWAP_BYTES(buf, 0, 1);
                    break;

                case 4:
                    for(/*void*/; nelmts >= 20; nelmts -= 20) {
                        H5_SWAP_BYTES(buf,  0,  3); /*  0 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /*  1 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /*  2 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /*  3 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /*  4 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /*  5 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /*  6 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /*  7 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /*  8 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /*  9 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /* 10 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /* 11 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /* 12 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /* 13 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /* 14 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /* 15 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /* 16 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /* 17 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /* 18 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  3); /* 19 */
                        H5_SWAP_BYTES(buf,  1,  2);
                        buf += buf_stride;
                    } /* end for */
                    for(i = 0; i < nelmts; i++, buf += buf_stride) {
                        H5_SWAP_BYTES(buf, 0, 3);
                        H5_SWAP_BYTES(buf, 1, 2);
                    } /* end for */
                    break;

                case 8:
                    for(/*void*/; nelmts >= 10; nelmts -= 10) {
                        H5_SWAP_BYTES(buf,  0,  7); /*  0 */
                        H5_SWAP_BYTES(buf,  1,  6);
                        H5_SWAP_BYTES(buf,  2,  5);
                        H5_SWAP_BYTES(buf,  3,  4);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  7); /*  1 */
                        H5_SWAP_BYTES(buf,  1,  6);
                        H5_SWAP_BYTES(buf,  2,  5);
                        H5_SWAP_BYTES(buf,  3,  4);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  7); /*  2 */
                        H5_SWAP_BYTES(buf,  1,  6);
                        H5_SWAP_BYTES(buf,  2,  5);
                        H5_SWAP_BYTES(buf,  3,  4);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  7); /*  3 */
                        H5_SWAP_BYTES(buf,  1,  6);
                        H5_SWAP_BYTES(buf,  2,  5);
                        H5_SWAP_BYTES(buf,  3,  4);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  7); /*  4 */
                        H5_SWAP_BYTES(buf,  1,  6);
                        H5_SWAP_BYTES(buf,  2,  5);
                        H5_SWAP_BYTES(buf,  3,  4);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  7); /*  5 */
                        H5_SWAP_BYTES(buf,  1,  6);
                        H5_SWAP_BYTES(buf,  2,  5);
                        H5_SWAP_BYTES(buf,  3,  4);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  7); /*  6 */
                        H5_SWAP_BYTES(buf,  1,  6);
                        H5_SWAP_BYTES(buf,  2,  5);
                        H5_SWAP_BYTES(buf,  3,  4);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  7); /*  7 */
                        H5_SWAP_BYTES(buf,  1,  6);
                        H5_SWAP_BYTES(buf,  2,  5);
                        H5_SWAP_BYTES(buf,  3,  4);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  7); /*  8 */
                        H5_SWAP_BYTES(buf,  1,  6);
                        H5_SWAP_BYTES(buf,  2,  5);
                        H5_SWAP_BYTES(buf,  3,  4);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,  0,  7); /*  9 */
                        H5_SWAP_BYTES(buf,  1,  6);
                        H5_SWAP_BYTES(buf,  2,  5);
                        H5_SWAP_BYTES(buf,  3,  4);
                        buf += buf_stride;
                    } /* end for */
                    for(i = 0; i < nelmts; i++, buf += buf_stride) {
                        H5_SWAP_BYTES(buf, 0, 7);
                        H5_SWAP_BYTES(buf, 1, 6);
                        H5_SWAP_BYTES(buf, 2, 5);
                        H5_SWAP_BYTES(buf, 3, 4);
                    } /* end for */
                    break;

                case 16:
                    for(/*void*/; nelmts >= 10; nelmts -= 10) {
                        H5_SWAP_BYTES(buf,   0,  15); /*  0 */
                        H5_SWAP_BYTES(buf,   1,  14);
                        H5_SWAP_BYTES(buf,   2,  13);
                        H5_SWAP_BYTES(buf,   3,  12);
                        H5_SWAP_BYTES(buf,   4,  11);
                        H5_SWAP_BYTES(buf,   5,  10);
                        H5_SWAP_BYTES(buf,   6,   9);
                        H5_SWAP_BYTES(buf,   7,   8);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,   0,  15); /*  1 */
                        H5_SWAP_BYTES(buf,   1,  14);
                        H5_SWAP_BYTES(buf,   2,  13);
                        H5_SWAP_BYTES(buf,   3,  12);
                        H5_SWAP_BYTES(buf,   4,  11);
                        H5_SWAP_BYTES(buf,   5,  10);
                        H5_SWAP_BYTES(buf,   6,   9);
                        H5_SWAP_BYTES(buf,   7,   8);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,   0,  15); /*  2 */
                        H5_SWAP_BYTES(buf,   1,  14);
                        H5_SWAP_BYTES(buf,   2,  13);
                        H5_SWAP_BYTES(buf,   3,  12);
                        H5_SWAP_BYTES(buf,   4,  11);
                        H5_SWAP_BYTES(buf,   5,  10);
                        H5_SWAP_BYTES(buf,   6,   9);
                        H5_SWAP_BYTES(buf,   7,   8);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,   0,  15); /*  3 */
                        H5_SWAP_BYTES(buf,   1,  14);
                        H5_SWAP_BYTES(buf,   2,  13);
                        H5_SWAP_BYTES(buf,   3,  12);
                        H5_SWAP_BYTES(buf,   4,  11);
                        H5_SWAP_BYTES(buf,   5,  10);
                        H5_SWAP_BYTES(buf,   6,   9);
                        H5_SWAP_BYTES(buf,   7,   8);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,   0,  15); /*  4 */
                        H5_SWAP_BYTES(buf,   1,  14);
                        H5_SWAP_BYTES(buf,   2,  13);
                        H5_SWAP_BYTES(buf,   3,  12);
                        H5_SWAP_BYTES(buf,   4,  11);
                        H5_SWAP_BYTES(buf,   5,  10);
                        H5_SWAP_BYTES(buf,   6,   9);
                        H5_SWAP_BYTES(buf,   7,   8);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,   0,  15); /*  5 */
                        H5_SWAP_BYTES(buf,   1,  14);
                        H5_SWAP_BYTES(buf,   2,  13);
                        H5_SWAP_BYTES(buf,   3,  12);
                        H5_SWAP_BYTES(buf,   4,  11);
                        H5_SWAP_BYTES(buf,   5,  10);
                        H5_SWAP_BYTES(buf,   6,   9);
                        H5_SWAP_BYTES(buf,   7,   8);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,   0,  15); /*  6 */
                        H5_SWAP_BYTES(buf,   1,  14);
                        H5_SWAP_BYTES(buf,   2,  13);
                        H5_SWAP_BYTES(buf,   3,  12);
                        H5_SWAP_BYTES(buf,   4,  11);
                        H5_SWAP_BYTES(buf,   5,  10);
                        H5_SWAP_BYTES(buf,   6,   9);
                        H5_SWAP_BYTES(buf,   7,   8);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,   0,  15); /*  7 */
                        H5_SWAP_BYTES(buf,   1,  14);
                        H5_SWAP_BYTES(buf,   2,  13);
                        H5_SWAP_BYTES(buf,   3,  12);
                        H5_SWAP_BYTES(buf,   4,  11);
                        H5_SWAP_BYTES(buf,   5,  10);
                        H5_SWAP_BYTES(buf,   6,   9);
                        H5_SWAP_BYTES(buf,   7,   8);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,   0,  15); /*  8 */
                        H5_SWAP_BYTES(buf,   1,  14);
                        H5_SWAP_BYTES(buf,   2,  13);
                        H5_SWAP_BYTES(buf,   3,  12);
                        H5_SWAP_BYTES(buf,   4,  11);
                        H5_SWAP_BYTES(buf,   5,  10);
                        H5_SWAP_BYTES(buf,   6,   9);
                        H5_SWAP_BYTES(buf,   7,   8);
                        buf += buf_stride;
                        H5_SWAP_BYTES(buf,   0,  15); /*  9 */
                        H5_SWAP_BYTES(buf,   1,  14);
                        H5_SWAP_BYTES(buf,   2,  13);
                        H5_SWAP_BYTES(buf,   3,  12);
                        H5_SWAP_BYTES(buf,   4,  11);
                        H5_SWAP_BYTES(buf,   5,  10);
                        H5_SWAP_BYTES(buf,   6,   9);
                        H5_SWAP_BYTES(buf,   7,   8);
                        buf += buf_stride;
                    } /* end for */
                    for(i = 0; i < nelmts; i++, buf += buf_stride) {
                        H5_SWAP_BYTES(buf, 0, 15);
                        H5_SWAP_BYTES(buf, 1, 14);
                        H5_SWAP_BYTES(buf, 2, 13);
                        H5_SWAP_BYTES(buf, 3, 12);
                        H5_SWAP_BYTES(buf, 4, 11);
                        H5_SWAP_BYTES(buf, 5, 10);
                        H5_SWAP_BYTES(buf, 6,  9);
                        H5_SWAP_BYTES(buf, 7,  8);
                    } /* end for */
                    break;

                default:
                    HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "invalid conversion size")
            } /* end switch */
            break;

        case H5T_CONV_FREE:
            /* Free private data */
            break;

        default:
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    } /* end switch */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_order_opt() */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_order
 *
 * Purpose:	Convert one type to another when byte order is the only
 *		difference.
 *
 * Note:	This is a soft conversion function.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Tuesday, January 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_order(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
	       size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride, void *_buf,
               void H5_ATTR_UNUSED *background)
{
    uint8_t	*buf = (uint8_t*)_buf;
    H5T_t	*src = NULL;
    H5T_t	*dst = NULL;
    size_t	i;
    size_t	j, md;
    herr_t      ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            /* Capability query */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) ||
                    NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
            if(src->shared->size != dst->shared->size || 0 != src->shared->u.atomic.offset ||
                    0 != dst->shared->u.atomic.offset ||
                    !((H5T_ORDER_BE == src->shared->u.atomic.order &&
                       H5T_ORDER_LE == dst->shared->u.atomic.order) ||
                      (H5T_ORDER_LE == src->shared->u.atomic.order &&
                       H5T_ORDER_BE == dst->shared->u.atomic.order)))
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "conversion not supported")
            switch(src->shared->type) {
                case H5T_INTEGER:
                case H5T_BITFIELD:
                    /* nothing to check */
                    break;

                case H5T_FLOAT:
                    if(src->shared->u.atomic.u.f.sign != dst->shared->u.atomic.u.f.sign ||
                            src->shared->u.atomic.u.f.epos != dst->shared->u.atomic.u.f.epos ||
                            src->shared->u.atomic.u.f.esize != dst->shared->u.atomic.u.f.esize ||
                            src->shared->u.atomic.u.f.ebias != dst->shared->u.atomic.u.f.ebias ||
                            src->shared->u.atomic.u.f.mpos != dst->shared->u.atomic.u.f.mpos ||
                            src->shared->u.atomic.u.f.msize != dst->shared->u.atomic.u.f.msize ||
                            src->shared->u.atomic.u.f.norm != dst->shared->u.atomic.u.f.norm ||
                            src->shared->u.atomic.u.f.pad != dst->shared->u.atomic.u.f.pad) {
                        HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "conversion not supported")
                    } /* end if */
                    break;

                case H5T_NO_CLASS:
                case H5T_TIME:
                case H5T_STRING:
                case H5T_OPAQUE:
                case H5T_COMPOUND:
                case H5T_REFERENCE:
                case H5T_ENUM:
                case H5T_VLEN:
                case H5T_ARRAY:
                case H5T_NCLASSES:
                default:
                    HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "conversion not supported")
            } /* end switch */
            cdata->need_bkg = H5T_BKG_NO;
            break;

        case H5T_CONV_CONV:
            /* The conversion */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")

            buf_stride = buf_stride ? buf_stride : src->shared->size;
            md = src->shared->size / 2;
            for(i = 0; i < nelmts; i++, buf += buf_stride)
                for(j = 0; j < md; j++)
                    H5_SWAP_BYTES(buf, j, src->shared->size - (j + 1));
            break;

        case H5T_CONV_FREE:
            /* Free private data */
            break;

        default:
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    } /* end switch */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_order() */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_b_b
 *
 * Purpose:	Convert from one bitfield to any other bitfield.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Thursday, May 20, 1999
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_b_b(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
	     size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride, void *_buf,
             void H5_ATTR_UNUSED *background)
{
    uint8_t	*buf = (uint8_t*)_buf;
    H5T_t	*src = NULL, *dst = NULL;	/*source and dest datatypes	*/
    ssize_t	direction;		/*direction of traversal	*/
    size_t	elmtno;			/*element number		*/
    size_t	olap;			/*num overlapping elements	*/
    size_t	half_size;		/*1/2 of total size for swapping*/
    uint8_t	*s, *sp, *d, *dp;	/*source and dest traversal ptrs*/
    uint8_t	dbuf[256];		/*temp destination buffer	*/
    size_t	msb_pad_offset;		/*offset for dest MSB padding	*/
    size_t	i;
    uint8_t     *src_rev=NULL;          /*order-reversed source buffer  */
    H5T_conv_cb_t       cb_struct = {NULL, NULL};      /*conversion callback structure */
    H5T_conv_ret_t      except_ret;     /*return of callback function   */
    hbool_t             reverse;        /*if reverse the order of destination        */
    herr_t      ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            /* Capability query */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) ||
                    NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
            if(H5T_ORDER_LE != src->shared->u.atomic.order &&
                    H5T_ORDER_BE != src->shared->u.atomic.order)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unsupported byte order")
            if(H5T_ORDER_LE != dst->shared->u.atomic.order &&
                    H5T_ORDER_BE != dst->shared->u.atomic.order)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unsupported byte order")
            cdata->need_bkg = H5T_BKG_NO;
            break;

        case H5T_CONV_FREE:
            break;

        case H5T_CONV_CONV:
            /* Get the datatypes */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")

            /*
             * Do we process the values from beginning to end or vice versa? Also,
             * how many of the elements have the source and destination areas
             * overlapping?
             */
            if(src->shared->size == dst->shared->size || buf_stride) {
                sp = dp = (uint8_t*)buf;
                direction = 1;
                olap = nelmts;
            } else if(src->shared->size >= dst->shared->size) {
                double olap_d = HDceil((double)(dst->shared->size) /
                                       (double)(src->shared->size - dst->shared->size));

                olap = (size_t)olap_d;
                sp = dp = (uint8_t*)buf;
                direction = 1;
            } else {
                double olap_d = HDceil((double)(src->shared->size) /
                                       (double)(dst->shared->size - src->shared->size));
                olap = (size_t)olap_d;
                sp = (uint8_t*)buf + (nelmts-1) * src->shared->size;
                dp = (uint8_t*)buf + (nelmts-1) * dst->shared->size;
                direction = -1;
            }

            /* Get conversion exception callback property */
            if(H5CX_get_dt_conv_cb(&cb_struct) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "unable to get conversion exception callback")

            /* Allocate space for order-reversed source buffer */
            src_rev = (uint8_t *)H5MM_calloc(src->shared->size);

            /* The conversion loop */
            H5_CHECK_OVERFLOW(buf_stride, size_t, ssize_t);
            H5_CHECK_OVERFLOW(src->shared->size, size_t, ssize_t);
            H5_CHECK_OVERFLOW(dst->shared->size, size_t, ssize_t);
            for(elmtno = 0; elmtno < nelmts; elmtno++) {

                /*
                 * If the source and destination buffers overlap then use a
                 * temporary buffer for the destination.
                 */
                if(direction > 0) {
                    s = sp;
                    d = elmtno < olap ? dbuf : dp;
                } /* end if */
                else {
                    s = sp;
                    d = (elmtno + olap) >= nelmts ? dbuf : dp;
                } /* end else */
#ifndef NDEBUG
                /* I don't quite trust the overlap calculations yet --rpm */
                if(d == dbuf)
                    HDassert((dp >= sp && dp < sp + src->shared->size) ||
                            (sp >= dp && sp < dp + dst->shared->size));
                else
                    HDassert((dp < sp && dp + dst->shared->size<=sp) ||
                            (sp < dp && sp + src->shared->size<=dp));
#endif

                /*
                 * Put the data in little endian order so our loops aren't so
                 * complicated.  We'll do all the conversion stuff assuming
                 * little endian and then we'll fix the order at the end.
                 */
                if(H5T_ORDER_BE == src->shared->u.atomic.order) {
                    half_size = src->shared->size / 2;
                    for(i = 0; i < half_size; i++) {
                        uint8_t tmp = s[src->shared->size - (i + 1)];
                        s[src->shared->size - (i + 1)] = s[i];
                        s[i] = tmp;
                    } /* end for */
                } /* end if */

                /* Initiate these variables */
                except_ret = H5T_CONV_UNHANDLED;
                reverse    = TRUE;

                /*
                 * Copy the significant part of the value. If the source is larger
                 * than the destination then invoke the overflow function or copy
                 * as many bits as possible. Zero extra bits in the destination.
                 */
                if(src->shared->u.atomic.prec > dst->shared->u.atomic.prec) {
                    /*overflow*/
                    if(cb_struct.func) { /*If user's exception handler is present, use it*/
                        H5T_reverse_order(src_rev, s, src->shared->size, src->shared->u.atomic.order); /*reverse order first*/
                        except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI, src_id, dst_id,
                                src_rev, d, cb_struct.user_data);
                    } /* end if */

                    if(except_ret == H5T_CONV_UNHANDLED) {
                        H5T__bit_copy(d, dst->shared->u.atomic.offset,
                                     s, src->shared->u.atomic.offset, dst->shared->u.atomic.prec);
                    } else if(except_ret == H5T_CONV_ABORT)
                        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                    else if(except_ret == H5T_CONV_HANDLED)
                        /*Don't reverse because user handles it*/
                        reverse = FALSE;
                } else {
                    H5T__bit_copy(d, dst->shared->u.atomic.offset,
                                 s, src->shared->u.atomic.offset,
                                 src->shared->u.atomic.prec);
                    H5T__bit_set(d, dst->shared->u.atomic.offset+src->shared->u.atomic.prec,
                                dst->shared->u.atomic.prec-src->shared->u.atomic.prec, FALSE);
                }

                /*
                 * Fill the destination padding areas.
                 */
                switch(dst->shared->u.atomic.lsb_pad) {
                    case H5T_PAD_ZERO:
                        H5T__bit_set(d, (size_t)0, dst->shared->u.atomic.offset, FALSE);
                        break;

                    case H5T_PAD_ONE:
                        H5T__bit_set(d, (size_t)0, dst->shared->u.atomic.offset, TRUE);
                        break;

                    case H5T_PAD_ERROR:
                    case H5T_PAD_BACKGROUND:
                    case H5T_NPAD:
                    default:
                        HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unsupported LSB padding")
                } /* end switch */
                msb_pad_offset = dst->shared->u.atomic.offset + dst->shared->u.atomic.prec;
                switch(dst->shared->u.atomic.msb_pad) {
                    case H5T_PAD_ZERO:
                        H5T__bit_set(d, msb_pad_offset, 8 * dst->shared->size - msb_pad_offset, FALSE);
                        break;

                    case H5T_PAD_ONE:
                        H5T__bit_set(d, msb_pad_offset, 8 * dst->shared->size - msb_pad_offset, TRUE);
                        break;

                    case H5T_PAD_ERROR:
                    case H5T_PAD_BACKGROUND:
                    case H5T_NPAD:
                    default:
                        HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unsupported MSB padding")
                } /* end switch */

                /*
                 * Put the destination in the correct byte order.  See note at
                 * beginning of loop.
                 */
                if(H5T_ORDER_BE == dst->shared->u.atomic.order && reverse) {
                    half_size = dst->shared->size / 2;
                    for(i = 0; i < half_size; i++) {
                        uint8_t tmp = d[dst->shared->size - (i + 1)];
                        d[dst->shared->size - (i + 1)] = d[i];
                        d[i] = tmp;
                    } /* end for */
                } /* end if */

                /*
                 * If we had used a temporary buffer for the destination then we
                 * should copy the value to the true destination buffer.
                 */
                if(d == dbuf)
                    H5MM_memcpy(dp, d, dst->shared->size);
                if(buf_stride) {
                    sp += direction * (ssize_t)buf_stride; /* Note that cast is checked with H5_CHECK_OVERFLOW, above */
                    dp += direction * (ssize_t)buf_stride; /* Note that cast is checked with H5_CHECK_OVERFLOW, above */
                } /* end if */
                else {
                    sp += direction * (ssize_t)src->shared->size; /* Note that cast is checked with H5_CHECK_OVERFLOW, above */
                    dp += direction * (ssize_t)dst->shared->size; /* Note that cast is checked with H5_CHECK_OVERFLOW, above */
                } /* end else */
            } /* end for */

            break;

        default:
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    } /* end switch */

done:
    if(src_rev)
        H5MM_free(src_rev);
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_b_b() */


/*-------------------------------------------------------------------------
 * Function:	H5T_conv_struct_free
 *
 * Purpose:	Free the private data structure used by the compound
 *      conversion functions.
 *
 * Return:	The result of H5MM_xfree(priv) (NULL)
 *
 * Programmer:	Neil Fortner
 *		Wednesday, October 1, 2008
 *
 *-------------------------------------------------------------------------
 */
static H5T_conv_struct_t *
H5T_conv_struct_free(H5T_conv_struct_t *priv)
{
    int         *src2dst = priv->src2dst;
    hid_t       *src_memb_id = priv->src_memb_id,
                *dst_memb_id = priv->dst_memb_id;
    unsigned    i;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    for(i = 0; i < priv->src_nmembs; i++)
        if(src2dst[i] >= 0) {
            int status;

            status = H5I_dec_ref(src_memb_id[i]);
            HDassert(status >= 0);
            status = H5I_dec_ref(dst_memb_id[src2dst[i]]);
            HDassert(status >= 0);
        } /* end if */

    H5MM_xfree(src2dst);
    H5MM_xfree(src_memb_id);
    H5MM_xfree(dst_memb_id);
    H5MM_xfree(priv->memb_path);

    FUNC_LEAVE_NOAPI((H5T_conv_struct_t *)H5MM_xfree(priv))
} /* end H5T_conv_struct_free() */


/*-------------------------------------------------------------------------
 * Function:	H5T_conv_struct_init
 *
 * Purpose:	Initialize the `priv' field of `cdata' with conversion
 *		information that is relatively constant.  If `priv' is
 *		already initialized then the member conversion functions
 *		are recalculated.
 *
 *		Priv fields are indexed by source member number or
 *		destination member number depending on whether the field
 *		contains information about the source datatype or the
 *		destination datatype (fields that contains the same
 *		information for both source and destination are indexed by
 *		source member number).  The src2dst[] priv array maps source
 *		member numbers to destination member numbers, but if the
 *		source member doesn't have a corresponding destination member
 *		then the src2dst[i]=-1.
 *
 *              Special optimization case when the source and destination
 *              members are a subset of each other, and the order is the same,
 *              and no conversion is needed.  For example:
 *                  struct source {            struct destination {
 *                      TYPE1 A;      -->          TYPE1 A;
 *                      TYPE2 B;      -->          TYPE2 B;
 *                      TYPE3 C;      -->          TYPE3 C;
 *                  };                             TYPE4 D;
 *                                                 TYPE5 E;
 *                                             };
 *              or
 *                  struct destination {       struct source {
 *                      TYPE1 A;      <--          TYPE1 A;
 *                      TYPE2 B;      <--          TYPE2 B;
 *                      TYPE3 C;      <--          TYPE3 C;
 *                  };                             TYPE4 D;
 *                                                 TYPE5 E;
 *                                             };
 *              The optimization is simply moving data to the appropriate
 *              places in the buffer.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Monday, January 26, 1998
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5T_conv_struct_init(H5T_t *src, H5T_t *dst, H5T_cdata_t *cdata)
{
    H5T_conv_struct_t	*priv = (H5T_conv_struct_t*)(cdata->priv);
    int		        *src2dst = NULL;
    unsigned            src_nmembs, dst_nmembs;
    unsigned		i, j;
    herr_t              ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    src_nmembs = src->shared->u.compnd.nmembs;
    dst_nmembs = dst->shared->u.compnd.nmembs;

    if(!priv) {
        /*
         * Allocate private data structure and arrays.
         */
        if(NULL == (priv = (H5T_conv_struct_t *)(cdata->priv=H5MM_calloc(sizeof(H5T_conv_struct_t)))) ||
                NULL == (priv->src2dst = (int *)H5MM_malloc(src_nmembs * sizeof(int))) ||
                NULL == (priv->src_memb_id = (hid_t *)H5MM_malloc(src_nmembs * sizeof(hid_t))) ||
                NULL == (priv->dst_memb_id = (hid_t *)H5MM_malloc(dst_nmembs * sizeof(hid_t))))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
        src2dst = priv->src2dst;
        priv->src_nmembs = src_nmembs;

        /* The flag of special optimization to indicate if source members and destination
         * members are a subset of each other.  Initialize it to FALSE */
        priv->subset_info.subset = H5T_SUBSET_FALSE;
        priv->subset_info.copy_size = 0;

        /*
         * Insure that members are sorted.
         */
        H5T__sort_value(src, NULL);
        H5T__sort_value(dst, NULL);

        /*
         * Build a mapping from source member number to destination member
         * number. If some source member is not a destination member then that
         * mapping element will be negative.  Also create atoms for each
         * source and destination member datatype so we can look up the
         * member datatype conversion functions later.
         */
        for(i = 0; i < src_nmembs; i++) {
            src2dst[i] = -1;
            for(j = 0; j < dst_nmembs; j++) {
                if(!HDstrcmp(src->shared->u.compnd.memb[i].name, dst->shared->u.compnd.memb[j].name)) {
                    H5_CHECKED_ASSIGN(src2dst[i], int, j, unsigned);
                    break;
                } /* end if */
            } /* end for */
            if(src2dst[i] >= 0) {
                hid_t	tid;
                H5T_t	*type;

                type = H5T_copy(src->shared->u.compnd.memb[i].type, H5T_COPY_ALL);
                tid = H5I_register(H5I_DATATYPE, type, FALSE);
                HDassert(tid >= 0);
                priv->src_memb_id[i] = tid;

                type = H5T_copy(dst->shared->u.compnd.memb[src2dst[i]].type, H5T_COPY_ALL);
                tid = H5I_register(H5I_DATATYPE, type, FALSE);
                HDassert(tid >= 0);
                priv->dst_memb_id[src2dst[i]] = tid;
            } /* end if */
        } /* end for */
    } /* end if */
    else {
        /* Restore sorted conditions for the datatypes */
        /* (Required for the src2dst array to be valid) */
        H5T__sort_value(src, NULL);
        H5T__sort_value(dst, NULL);
    } /* end else */

    /*
     * (Re)build the cache of member conversion functions and pointers to
     * their cdata entries.
     */
    src2dst = priv->src2dst;
    H5MM_xfree(priv->memb_path);
    if(NULL == (priv->memb_path = (H5T_path_t **)H5MM_malloc(src->shared->u.compnd.nmembs * sizeof(H5T_path_t*))))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")

    for(i = 0; i < src_nmembs; i++) {
        if(src2dst[i] >= 0) {
            H5T_path_t *tpath = H5T_path_find(src->shared->u.compnd.memb[i].type, dst->shared->u.compnd.memb[src2dst[i]].type);

            if(NULL == (priv->memb_path[i] = tpath)) {
                cdata->priv = H5T_conv_struct_free(priv);
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unable to convert member datatype")
            } /* end if */
        } /* end if */
    } /* end for */

    /* The compound conversion functions need a background buffer */
    cdata->need_bkg = H5T_BKG_YES;

    if(src_nmembs < dst_nmembs) {
        priv->subset_info.subset = H5T_SUBSET_SRC;
        for(i = 0; i < src_nmembs; i++) {
            /* If any of source members doesn't have counterpart in the same
                * order or there's conversion between members, don't do the
                * optimization.
                */
            if(src2dst[i] != (int)i || (src->shared->u.compnd.memb[i].offset != dst->shared->u.compnd.memb[i].offset) || (priv->memb_path[i])->is_noop == FALSE) {
                priv->subset_info.subset = H5T_SUBSET_FALSE;
                break;
            } /* end if */
        } /* end for */
        /* Compute the size of the data to be copied for each element.  It
            * may be smaller than either src or dst if there is extra space at
            * the end of src.
            */
        if(priv->subset_info.subset == H5T_SUBSET_SRC)
            priv->subset_info.copy_size = src->shared->u.compnd.memb[src_nmembs - 1].offset
                + src->shared->u.compnd.memb[src_nmembs - 1].size;
    } else if(dst_nmembs < src_nmembs) {
        priv->subset_info.subset = H5T_SUBSET_DST;
        for(i = 0; i < dst_nmembs; i++) {
            /* If any of source members doesn't have counterpart in the same order or
                * there's conversion between members, don't do the optimization. */
            if(src2dst[i] != (int)i || (src->shared->u.compnd.memb[i].offset != dst->shared->u.compnd.memb[i].offset) || (priv->memb_path[i])->is_noop == FALSE) {
                priv->subset_info.subset = H5T_SUBSET_FALSE;
                break;
            }
        } /* end for */
        /* Compute the size of the data to be copied for each element.  It
            * may be smaller than either src or dst if there is extra space at
            * the end of dst.
            */
        if(priv->subset_info.subset == H5T_SUBSET_DST)
            priv->subset_info.copy_size = dst->shared->u.compnd.memb[dst_nmembs-1].offset
                + dst->shared->u.compnd.memb[dst_nmembs-1].size;
    } else /* If the numbers of source and dest members are equal and no conversion is needed,
            * the case should have been handled as noop earlier in H5Dio.c. */
        {;}

    cdata->recalc = FALSE;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T_conv_struct_init() */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_struct_subset
 *
 * Purpose:     A quick way to return a field in a struct private in this
 *              file.  The flag SMEMBS_SUBSET indicates whether the source
 *              members are a subset of destination or the destination
 *              members are a subset of the source, and the order is the
 *              same, and no conversion is needed.  For example:
 *                  struct source {            struct destination {
 *                      TYPE1 A;      -->          TYPE1 A;
 *                      TYPE2 B;      -->          TYPE2 B;
 *                      TYPE3 C;      -->          TYPE3 C;
 *                  };                             TYPE4 D;
 *                                                 TYPE5 E;
 *                                             };
 *
 * Return:      A pointer to the subset info struct in p.  Points directly
 *              into the structure.
 *
 * Programmer:	Raymond Lu
 *		8 June 2007
 *
 *-------------------------------------------------------------------------
 */
H5T_subset_info_t *
H5T__conv_struct_subset(const H5T_cdata_t *cdata)
{
    H5T_conv_struct_t	*priv = NULL;

    FUNC_ENTER_PACKAGE_NOERR

    HDassert(cdata);
    HDassert(cdata->priv);

    priv = (H5T_conv_struct_t *)(cdata->priv);

    FUNC_LEAVE_NOAPI((H5T_subset_info_t *) &priv->subset_info)
} /* end H5T__conv_struct_subset() */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_struct
 *
 * Purpose:	Converts between compound datatypes.  This is a soft
 *		conversion function.  The algorithm is basically:
 *
 * 		For each element do
 *		  For I=1..NELMTS do
 *		    If sizeof destination type <= sizeof source type then
 *		      Convert member to destination type;
 *		    Move member as far left as possible;
 *
 *		  For I=NELMTS..1 do
 *		    If not destination type then
 *		      Convert member to destination type;
 *		    Move member to correct position in BKG
 *
 *		  Copy BKG to BUF
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Thursday, January 22, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_struct(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
    size_t buf_stride, size_t bkg_stride, void *_buf, void *_bkg)
{
    uint8_t	*buf = (uint8_t *)_buf;	/*cast for pointer arithmetic	*/
    uint8_t	*bkg = (uint8_t *)_bkg;	/*background pointer arithmetic	*/
    uint8_t     *xbuf = buf, *xbkg = bkg;   /*temp pointers into buf and bkg*/
    H5T_t	*src = NULL;		/*source datatype		*/
    H5T_t	*dst = NULL;		/*destination datatype		*/
    int	*src2dst = NULL;	/*maps src member to dst member	*/
    H5T_cmemb_t	*src_memb = NULL;	/*source struct member descript.*/
    H5T_cmemb_t	*dst_memb = NULL;	/*destination struct memb desc.	*/
    size_t	offset;			/*byte offset wrt struct	*/
    ssize_t	src_delta;	        /*source stride	*/
    ssize_t	bkg_delta;	        /*background stride	*/
    size_t	elmtno;
    unsigned	u;		        /*counters			*/
    int	        i;			/*counters			*/
    H5T_conv_struct_t *priv = (H5T_conv_struct_t *)(cdata->priv);
    herr_t      ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            /*
             * First, determine if this conversion function applies to the
             * conversion path SRC_ID-->DST_ID.  If not, return failure;
             * otherwise initialize the `priv' field of `cdata' with information
             * that remains (almost) constant for this conversion path.
             */
            if (NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a datatype")
            if(H5T_COMPOUND != src->shared->type)
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a H5T_COMPOUND datatype")
            if(H5T_COMPOUND != dst->shared->type) 
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a H5T_COMPOUND datatype")

            if(H5T_conv_struct_init(src, dst, cdata) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to initialize conversion data")
            break;

        case H5T_CONV_FREE:
            /*
             * Free the private conversion data.
             */
            cdata->priv = H5T_conv_struct_free(priv);
            break;

        case H5T_CONV_CONV:
            /*
             * Conversion.
             */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a datatype")
            HDassert(priv);
            HDassert(bkg && cdata->need_bkg);

            if(cdata->recalc && H5T_conv_struct_init(src, dst, cdata) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to initialize conversion data")

            /*
             * Insure that members are sorted.
             */
            H5T__sort_value(src, NULL);
            H5T__sort_value(dst, NULL);
            src2dst = priv->src2dst;

            /*
             * Direction of conversion and striding through background.
             */
            if(buf_stride) {
                H5_CHECKED_ASSIGN(src_delta, ssize_t, buf_stride, size_t);
                if(!bkg_stride) {
                    H5_CHECKED_ASSIGN(bkg_delta, ssize_t, dst->shared->size, size_t);
                } /* end if */
                else
                    H5_CHECKED_ASSIGN(bkg_delta, ssize_t, bkg_stride, size_t);
            } /* end if */
            else if(dst->shared->size <= src->shared->size) {
                H5_CHECKED_ASSIGN(src_delta, ssize_t, src->shared->size, size_t);
                H5_CHECKED_ASSIGN(bkg_delta, ssize_t, dst->shared->size, size_t);
            } /* end else-if */
            else {
                H5_CHECK_OVERFLOW(src->shared->size, size_t, ssize_t);
                src_delta = -(ssize_t)src->shared->size;
                H5_CHECK_OVERFLOW(dst->shared->size, size_t, ssize_t);
                bkg_delta = -(ssize_t)dst->shared->size;
                xbuf += (nelmts - 1) * src->shared->size;
                xbkg += (nelmts - 1) * dst->shared->size;
            } /* end else */

            /* Conversion loop... */
            for(elmtno = 0; elmtno < nelmts; elmtno++) {
                /*
                 * For each source member which will be present in the
                 * destination, convert the member to the destination type unless
                 * it is larger than the source type.  Then move the member to the
                 * left-most unoccupied position in the buffer.  This makes the
                 * data point as small as possible with all the free space on the
                 * right side.
                 */
                for(u = 0, offset = 0; u < src->shared->u.compnd.nmembs; u++) {
                    if(src2dst[u] < 0)
                        continue; /*subsetting*/
                    src_memb = src->shared->u.compnd.memb + u;
                    dst_memb = dst->shared->u.compnd.memb + src2dst[u];

                    if(dst_memb->size <= src_memb->size) {
                        if(H5T_convert(priv->memb_path[u], priv->src_memb_id[u],
                                priv->dst_memb_id[src2dst[u]],
                                (size_t)1, (size_t)0, (size_t)0, /*no striding (packed array)*/
                                xbuf + src_memb->offset, xbkg + dst_memb->offset) < 0)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to convert compound datatype member")
                        HDmemmove(xbuf + offset, xbuf + src_memb->offset, dst_memb->size);
                        offset += dst_memb->size;
                    } /* end if */
                    else {
                        HDmemmove (xbuf+offset, xbuf+src_memb->offset,
                                   src_memb->size);
                        offset += src_memb->size;
                    } /* end else */
                } /* end for */

                /*
                 * For each source member which will be present in the
                 * destination, convert the member to the destination type if it
                 * is larger than the source type (that is, has not been converted
                 * yet).  Then copy the member to the destination offset in the
                 * background buffer.
                 */
                H5_CHECK_OVERFLOW(src->shared->u.compnd.nmembs, size_t, int);
                for(i = (int)src->shared->u.compnd.nmembs - 1; i >= 0; --i) {
                    if(src2dst[i] < 0)
                        continue; /*subsetting*/
                    src_memb = src->shared->u.compnd.memb + i;
                    dst_memb = dst->shared->u.compnd.memb + src2dst[i];

                    if(dst_memb->size > src_memb->size) {
                        offset -= src_memb->size;
                        if(H5T_convert(priv->memb_path[i],
                                    priv->src_memb_id[i], priv->dst_memb_id[src2dst[i]],
                                    (size_t)1, (size_t)0, (size_t)0, /*no striding (packed array)*/
                                    xbuf + offset, xbkg + dst_memb->offset) < 0)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to convert compound datatype member")
                    } /* end if */
                    else
                        offset -= dst_memb->size;
                    HDmemmove(xbkg + dst_memb->offset, xbuf + offset, dst_memb->size);
                } /* end for */
                HDassert(0 == offset);

                /*
                 * Update pointers
                 */
                xbuf += src_delta;
                xbkg += bkg_delta;
            } /* end for */

            /* If the bkg_delta was set to -(dst->shared->size), make it positive now */
            if(buf_stride == 0 && dst->shared->size > src->shared->size)
                H5_CHECKED_ASSIGN(bkg_delta, ssize_t, dst->shared->size, size_t);

            /*
             * Copy the background buffer back into the in-place conversion
             * buffer.
             */
            for(xbuf = buf, xbkg = bkg, elmtno = 0; elmtno < nelmts; elmtno++) {
                HDmemmove(xbuf, xbkg, dst->shared->size);
                xbuf += buf_stride ? buf_stride : dst->shared->size;
                xbkg += bkg_delta;
            } /* end for */
            break;

        default:
            /* Some other command we don't know about yet.*/
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    } /* end switch */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_struct() */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_struct_opt
 *
 * Purpose:	Converts between compound datatypes in a manner more
 *		efficient than the general-purpose H5T__conv_struct()
 *		function.  This function isn't applicable if the destination
 *		is larger than the source type. This is a soft conversion
 *		function.  The algorithm is basically:
 *
 * 		For each member of the struct
 *		  If sizeof destination type <= sizeof source type then
 *		    Convert member to destination type for all elements
 *		    Move memb to BKG buffer for all elements
 *		  Else
 *		    Move member as far left as possible for all elements
 *
 *		For each member of the struct (in reverse order)
 *		  If not destination type then
 *		    Convert member to destination type for all elements
 *		    Move member to correct position in BKG for all elements
 *
 *		Copy BKG to BUF for all elements
 *
 *              Special case when the source and destination members
 *              are a subset of each other, and the order is the same, and no
 *              conversion is needed.  For example:
 *                  struct source {            struct destination {
 *                      TYPE1 A;      -->          TYPE1 A;
 *                      TYPE2 B;      -->          TYPE2 B;
 *                      TYPE3 C;      -->          TYPE3 C;
 *                  };                             TYPE4 D;
 *                                                 TYPE5 E;
 *                                             };
 *              The optimization is simply moving data to the appropriate
 *              places in the buffer.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Thursday, January 22, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_struct_opt(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t bkg_stride, void *_buf, void *_bkg)
{
    uint8_t	*buf = (uint8_t *)_buf;	/*cast for pointer arithmetic	*/
    uint8_t	*bkg = (uint8_t *)_bkg;	/*background pointer arithmetic	*/
    uint8_t	*xbuf = NULL;		/*temporary pointer into `buf'	*/
    uint8_t	*xbkg = NULL;		/*temporary pointer into `bkg'	*/
    H5T_t	*src = NULL;		/*source datatype		*/
    H5T_t	*dst = NULL;		/*destination datatype		*/
    int	*src2dst = NULL;		/*maps src member to dst member	*/
    H5T_cmemb_t	*src_memb = NULL;	/*source struct member descript.*/
    H5T_cmemb_t	*dst_memb = NULL;	/*destination struct memb desc.	*/
    size_t	offset;			/*byte offset wrt struct	*/
    size_t	elmtno;			/*element counter		*/
    size_t      copy_size;              /*size of element for copying   */
    H5T_conv_struct_t *priv = NULL;	/*private data			*/
    hbool_t     no_stride = FALSE;      /*flag to indicate no stride    */
    unsigned	u;			/*counters			*/
    int		i;			/*counters			*/
    herr_t      ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            /*
             * First, determine if this conversion function applies to the
             * conversion path SRC_ID-->DST_ID.  If not, return failure;
             * otherwise initialize the `priv' field of `cdata' with information
             * that remains (almost) constant for this conversion path.
             */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
            if(H5T_COMPOUND != src->shared->type)
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a H5T_COMPOUND datatype")
            if(H5T_COMPOUND != dst->shared->type) 
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a H5T_COMPOUND datatype")

            /* Initialize data which is relatively constant */
            if(H5T_conv_struct_init(src, dst, cdata) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to initialize conversion data")
            priv = (H5T_conv_struct_t *)(cdata->priv);
            src2dst = priv->src2dst;

            /*
             * If the destination type is not larger than the source type then
             * this conversion function is guaranteed to work (provided all
             * members can be converted also). Otherwise the determination is
             * quite a bit more complicated. Essentially we have to make sure
             * that there is always room in the source buffer to do the
             * conversion of a member in place. This is basically the same pair
             * of loops as in the actual conversion except it checks that there
             * is room for each conversion instead of actually doing anything.
             */
            if(dst->shared->size > src->shared->size) {
                for(u = 0, offset = 0; u < src->shared->u.compnd.nmembs; u++) {
                    if(src2dst[u] < 0)
                        continue;
                    src_memb = src->shared->u.compnd.memb + u;
                    dst_memb = dst->shared->u.compnd.memb + src2dst[u];
                    if(dst_memb->size > src_memb->size)
                        offset += src_memb->size;
                } /* end for */
                H5_CHECK_OVERFLOW(src->shared->u.compnd.nmembs, size_t, int);
                for(i = (int)src->shared->u.compnd.nmembs - 1; i >= 0; --i) {
                    if(src2dst[i] < 0)
                        continue;
                    src_memb = src->shared->u.compnd.memb + i;
                    dst_memb = dst->shared->u.compnd.memb + src2dst[i];
                    if(dst_memb->size > src_memb->size) {
                        offset -= src_memb->size;
                        if(dst_memb->size > src->shared->size-offset) {
                            cdata->priv = H5T_conv_struct_free(priv);
                            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "conversion is unsupported by this function")
                        } /* end if */
                    } /* end if */
                } /* end for */
            } /* end if */
            break;

        case H5T_CONV_FREE:
            /*
             * Free the private conversion data.
             */
            cdata->priv = H5T_conv_struct_free((H5T_conv_struct_t *)(cdata->priv));
            break;

        case H5T_CONV_CONV:
            /*
             * Conversion.
             */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")

            /* Update cached data if necessary */
            if(cdata->recalc && H5T_conv_struct_init(src, dst, cdata) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to initialize conversion data")
            priv = (H5T_conv_struct_t *)(cdata->priv);
            HDassert(priv);
            src2dst = priv->src2dst;
            HDassert(bkg && cdata->need_bkg);

            /*
             * Insure that members are sorted.
             */
            H5T__sort_value(src, NULL);
            H5T__sort_value(dst, NULL);

            /*
             * Calculate strides. If BUF_STRIDE is non-zero then convert one
             * data element at every BUF_STRIDE bytes through the main buffer
             * (BUF), leaving the result of each conversion at the same
             * location; otherwise assume the source and destination data are
             * packed tightly based on src->shared->size and dst->shared->size.  Also, if
             * BUF_STRIDE and BKG_STRIDE are both non-zero then place
             * background data into the BKG buffer at multiples of BKG_STRIDE;
             * otherwise assume BKG buffer is the packed destination datatype.
             */
            if(!buf_stride || !bkg_stride)
                bkg_stride = dst->shared->size;
            if(!buf_stride) {
                no_stride = TRUE;
                buf_stride = src->shared->size;
            } /* end if */

            if(priv->subset_info.subset == H5T_SUBSET_SRC || priv->subset_info.subset == H5T_SUBSET_DST) {
                /* If the optimization flag is set to indicate source members are a subset and
                 * in the top of the destination, simply copy the source members to background buffer.
                 */
                xbuf = buf;
                xbkg = bkg;
                copy_size = priv->subset_info.copy_size;

                for(elmtno = 0; elmtno < nelmts; elmtno++) {
                    HDmemmove(xbkg, xbuf, copy_size);

                    /* Update pointers */
                    xbuf += buf_stride;
                    xbkg += bkg_stride;
                } /* end for */
            } /* end if */
            else {
                /*
                 * For each member where the destination is not larger than the
                 * source, stride through all the elements converting only that member
                 * in each element and then copying the element to its final
                 * destination in the bkg buffer. Otherwise move the element as far
                 * left as possible in the buffer.
                 */
                for(u = 0, offset = 0; u < src->shared->u.compnd.nmembs; u++) {
                    if(src2dst[u] < 0)
                        continue; /*subsetting*/
                    src_memb = src->shared->u.compnd.memb + u;
                    dst_memb = dst->shared->u.compnd.memb + src2dst[u];

                    if(dst_memb->size <= src_memb->size) {
                        xbuf = buf + src_memb->offset;
                        xbkg = bkg + dst_memb->offset;
                        if(H5T_convert(priv->memb_path[u], priv->src_memb_id[u],
                                priv->dst_memb_id[src2dst[u]], nelmts,
                                buf_stride, bkg_stride, xbuf, xbkg) < 0)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to convert compound datatype member")
                        for(elmtno = 0; elmtno < nelmts; elmtno++) {
                            HDmemmove(xbkg, xbuf, dst_memb->size);
                            xbuf += buf_stride;
                            xbkg += bkg_stride;
                        } /* end for */
                    } /* end if */
                    else {
                        for(xbuf = buf, elmtno = 0; elmtno < nelmts; elmtno++) {
                            HDmemmove(xbuf + offset, xbuf + src_memb->offset, src_memb->size);
                            xbuf += buf_stride;
                        } /* end for */
                        offset += src_memb->size;
                    } /* end else */
                } /* end else */

                /*
                 * Work from right to left, converting those members that weren't
                 * converted in the previous loop (those members where the destination
                 * is larger than the source) and them to their final position in the
                 * bkg buffer.
                 */
                H5_CHECK_OVERFLOW(src->shared->u.compnd.nmembs, size_t, int);
                for(i = (int)src->shared->u.compnd.nmembs - 1; i >= 0; --i) {
                    if(src2dst[i] < 0)
                        continue;
                    src_memb = src->shared->u.compnd.memb + i;
                    dst_memb = dst->shared->u.compnd.memb + src2dst[i];

                    if(dst_memb->size > src_memb->size) {
                        offset -= src_memb->size;
                        xbuf = buf + offset;
                        xbkg = bkg + dst_memb->offset;
                        if(H5T_convert(priv->memb_path[i], priv->src_memb_id[i],
                                priv->dst_memb_id[src2dst[i]], nelmts,
                                buf_stride, bkg_stride, xbuf, xbkg) < 0)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to convert compound datatype member")
                        for(elmtno = 0; elmtno < nelmts; elmtno++) {
                            HDmemmove(xbkg, xbuf, dst_memb->size);
                            xbuf += buf_stride;
                            xbkg += bkg_stride;
                        } /* end for */
                    } /* end if */
                } /* end for */
            } /* end else */

            if(no_stride)
                buf_stride = dst->shared->size;

            /* Move background buffer into result buffer */
            for(xbuf = buf, xbkg = bkg, elmtno = 0; elmtno < nelmts; elmtno++) {
                HDmemmove(xbuf, xbkg, dst->shared->size);
                xbuf += buf_stride;
                xbkg += bkg_stride;
            } /* end for */
            break;

        default:
            /* Some other command we don't know about yet.*/
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    } /* end switch */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_struct_opt() */


/*-------------------------------------------------------------------------
 * Function:	H5T_conv_enum_init
 *
 * Purpose:	Initialize information for H5T__conv_enum().
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *              Monday, January  4, 1999
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5T_conv_enum_init(H5T_t *src, H5T_t *dst, H5T_cdata_t *cdata)
{
    H5T_enum_struct_t	*priv = NULL;	/*private conversion data	*/
    int		n;		/*src value cast as native int	*/
    int		domain[2] = {0, 0};	/*min and max source values	*/
    int		*map = NULL;	/*map from src value to dst idx	*/
    unsigned	length;		/*nelmts in map array		*/
    unsigned	i, j;		/*counters			*/
    herr_t      ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    cdata->need_bkg = H5T_BKG_NO;
    if(NULL == (priv = (H5T_enum_struct_t *)(cdata->priv = H5MM_calloc(sizeof(*priv)))))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
    if(0 == src->shared->u.enumer.nmembs)
	HGOTO_DONE(SUCCEED);

    /*
     * Check that the source symbol names are a subset of the destination
     * symbol names and build a map from source member index to destination
     * member index.
     */
    H5T__sort_name(src, NULL);
    H5T__sort_name(dst, NULL);
    if(NULL == (priv->src2dst = (int *)H5MM_malloc(src->shared->u.enumer.nmembs * sizeof(int))))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
    for(i = 0, j = 0;
             i < src->shared->u.enumer.nmembs && j < dst->shared->u.enumer.nmembs;
             i++, j++) {
	while(j < dst->shared->u.enumer.nmembs &&
	       HDstrcmp(src->shared->u.enumer.name[i], dst->shared->u.enumer.name[j]))
            j++;
	if(j >= dst->shared->u.enumer.nmembs)
	    HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "source type is not a subset of destination type")
	priv->src2dst[i] = (int)j;
    } /* end for */

    /*
     * The conversion function will use an O(log N) lookup method for each
     * value converted. However, if all of the following constraints are met
     * then we can build a perfect hash table and use an O(1) lookup method.
     *
     *	  A: The source datatype size matches one of our native datatype
     *	     sizes.
     *
     *	  B: After casting the source value bit pattern to a native type
     *	     the size of the range of values is less than 20% larger than
     *	     the number of values.
     *
     * If this special case is met then we use the source bit pattern cast as
     * a native integer type as an index into the `val2dst'. The values of
     * that array are the index numbers in the destination type or negative
     * if the entry is unused.
     *
     * (This optimized algorithm doesn't work when the byte orders are different.  
     * The code such as "n = *((int*)(src->shared->u.enumer.value+i*src->shared->size));"
     * can change the value significantly. i.g. if the source value is big-endian 0x0000000f,
     * executing the casting on little-endian machine will get a big number 0x0f000000.
     * Then it can't meet the condition 
     * "if(src->shared->u.enumer.nmembs<2 || (double)length/src->shared->u.enumer.nmembs<1.2)"
     * Because this is the optimized code, we won't fix it. It should still work in some 
     * situations. SLU - 2011/5/24) 
     */
    if(1 == src->shared->size || sizeof(short) == src->shared->size || sizeof(int) == src->shared->size) {
	for(i = 0; i < src->shared->u.enumer.nmembs; i++) {
	    if(1 == src->shared->size)
		n = *((signed char *)((uint8_t *)src->shared->u.enumer.value + i));
	    else if (sizeof(short) == src->shared->size)
		n = *((short *)((void *)((uint8_t *)src->shared->u.enumer.value + (i * src->shared->size))));
	    else
		n = *((int *)((void *)((uint8_t *)src->shared->u.enumer.value + (i * src->shared->size))));
	    if(0 == i) {
		domain[0] = domain[1] = n;
	    } else {
		domain[0] = MIN(domain[0], n);
		domain[1] = MAX(domain[1], n);
	    }
	} /* end for */

        HDassert(domain[1] >= domain[0]);
	length = (unsigned)(domain[1] - domain[0]) + 1;
	if(src->shared->u.enumer.nmembs < 2 ||
                (double)length / src->shared->u.enumer.nmembs < (double)(1.2f)) {
	    priv->base = domain[0];
	    priv->length = length;
	    if(NULL == (map = (int *)H5MM_malloc(length * sizeof(int))))
		HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
	    for(i = 0; i < length; i++)
                map[i] = -1; /*entry unused*/
	    for(i = 0; i < src->shared->u.enumer.nmembs; i++) {
		if(1 == src->shared->size)
		    n = *((signed char *)((uint8_t *)src->shared->u.enumer.value + i));
		else if(sizeof(short) == src->shared->size)
		    n = *((short *)((void *)((uint8_t *)src->shared->u.enumer.value + (i * src->shared->size))));
		else
		    n = *((int *)((void *)((uint8_t *)src->shared->u.enumer.value + (i * src->shared->size))));
		n -= priv->base;
		HDassert(n >= 0 && (unsigned)n < priv->length);
		HDassert(map[n] < 0);
		map[n] = priv->src2dst[i];
	    } /* end for */

	    /*
	     * Replace original src2dst array with our new one. The original
	     * was indexed by source member number while the new one is
	     * indexed by source values.
	     */
	    H5MM_xfree(priv->src2dst);
	    priv->src2dst = map;
	    HGOTO_DONE(SUCCEED);
	}
    }

    /* Sort source type by value and adjust src2dst[] appropriately */
    H5T__sort_value(src, priv->src2dst);

done:
    if (ret_value<0 && priv) {
	H5MM_xfree(priv->src2dst);
	H5MM_xfree(priv);
	cdata->priv = NULL;
    }
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_enum
 *
 * Purpose:	Converts one type of enumerated data to another.
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *              Monday, January  4, 1999
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_enum(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
    size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride, void *_buf,
    void H5_ATTR_UNUSED *bkg)
{
    uint8_t	*buf = (uint8_t*)_buf;	/*cast for pointer arithmetic	*/
    H5T_t	*src = NULL, *dst = NULL;	/*src and dst datatypes	*/
    uint8_t	*s = NULL, *d = NULL;	/*src and dst BUF pointers	*/
    ssize_t	src_delta, dst_delta;	/*conversion strides		*/
    int	n;			/*src value cast as native int	*/
    H5T_enum_struct_t *priv = (H5T_enum_struct_t*)(cdata->priv);
    H5T_conv_cb_t       cb_struct;      /*conversion callback structure */
    H5T_conv_ret_t      except_ret;     /*return of callback function   */
    size_t	i;			/*counters			*/
    herr_t      ret_value = SUCCEED;    /* Return value                 */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            /*
             * Determine if this conversion function applies to the conversion
             * path SRC_ID->DST_ID.  If not return failure; otherwise initialize
             * the `priv' field of `cdata' with information about the underlying
             * integer conversion.
             */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a datatype")
            if(H5T_ENUM != src->shared->type)
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a H5T_ENUM datatype")
            if(H5T_ENUM != dst->shared->type) 
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a H5T_ENUM datatype")

            if(H5T_conv_enum_init(src, dst, cdata) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to initialize private data")
            break;

        case H5T_CONV_FREE:
#ifdef H5T_DEBUG
            if (H5DEBUG(T)) {
                HDfprintf(H5DEBUG(T), "      Using %s mapping function%s\n",
                        priv->length?"O(1)":"O(log N)",
                        priv->length?"":", where N is the number of enum members");
            }
#endif
            if (priv) {
                H5MM_xfree(priv->src2dst);
                H5MM_xfree(priv);
            }
            cdata->priv = NULL;
            break;

        case H5T_CONV_CONV:
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
            if(H5T_ENUM != src->shared->type)
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a H5T_ENUM datatype")
            if(H5T_ENUM != dst->shared->type) 
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a H5T_ENUM datatype")

            /* priv->src2dst map was computed for certain sort keys. Make sure those same
             * sort keys are used here during conversion. See H5T_conv_enum_init(). But
             * we actually don't care about the source type's order when doing the O(1)
             * conversion algorithm, which is turned on by non-zero priv->length */
            H5T__sort_name(dst, NULL);
            if(!priv->length)
                H5T__sort_value(src, NULL);

            /*
             * Direction of conversion.
             */
            if(buf_stride) {
                H5_CHECK_OVERFLOW(buf_stride, size_t, ssize_t);
                src_delta = dst_delta = (ssize_t)buf_stride;
                s = d = buf;
            } else if(dst->shared->size <= src->shared->size) {
                H5_CHECKED_ASSIGN(src_delta, ssize_t, src->shared->size, size_t);
                H5_CHECKED_ASSIGN(dst_delta, ssize_t, dst->shared->size, size_t);
                s = d = buf;
            } else {
                H5_CHECK_OVERFLOW(src->shared->size, size_t, ssize_t);
                H5_CHECK_OVERFLOW(dst->shared->size, size_t, ssize_t);
                src_delta = -(ssize_t)src->shared->size;
                dst_delta = -(ssize_t)dst->shared->size;
                s = buf + (nelmts - 1) * src->shared->size;
                d = buf + (nelmts - 1) * dst->shared->size;
            }

            /* Get conversion exception callback property */
            if(H5CX_get_dt_conv_cb(&cb_struct) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "unable to get conversion exception callback")

            for(i = 0; i < nelmts; i++, s += src_delta, d += dst_delta) {
                if(priv->length) {
                    /* Use O(1) lookup */
                    /* (The casting won't work when the byte orders are different. i.g. if the source value
                     * is big-endian 0x0000000f, the direct casting "n = *((int*)s);" will make it a big
                     * number 0x0f000000 on little-endian machine. But we won't fix it because it's an 
                     * optimization code. Please also see the comment in the H5T_conv_enum_init() function.
                     * SLU - 2011/5/24)
                     */ 
                    if(1 == src->shared->size)
                        n = *((signed char*)s);
                    else if(sizeof(short) == src->shared->size)
                        n = *((short *)((void *)s));
                    else
                        n = *((int *)((void *)s));
                    n -= priv->base;
                    if(n < 0 || (unsigned)n >= priv->length || priv->src2dst[n] < 0) {
                        /*overflow*/
                        except_ret = H5T_CONV_UNHANDLED;
                        /*If user's exception handler is present, use it*/
                        if(cb_struct.func)
                            except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI, src_id, dst_id,
                                    s, d, cb_struct.user_data);

                        if(except_ret == H5T_CONV_UNHANDLED)
                            HDmemset(d, 0xff, dst->shared->size);
                        else if(except_ret == H5T_CONV_ABORT)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                    } else
                        H5MM_memcpy(d,
                                 (uint8_t *)dst->shared->u.enumer.value + ((unsigned)priv->src2dst[n] * dst->shared->size),
                                 dst->shared->size);
                } /* end if */
                else {
                    /* Use O(log N) lookup */
                    unsigned lt = 0;
                    unsigned rt = src->shared->u.enumer.nmembs;
                    unsigned md = 0;
                    int cmp;

                    while(lt < rt) {
                        md = (lt + rt) / 2;
                        cmp = HDmemcmp(s, (uint8_t *)src->shared->u.enumer.value + (md * src->shared->size),
                                       src->shared->size);
                        if(cmp < 0)
                            rt = md;
                        else if(cmp > 0)
                            lt = md + 1;
                        else
                            break;
                    } /* end while */
                    if(lt >= rt) {
                        except_ret = H5T_CONV_UNHANDLED;
                        /*If user's exception handler is present, use it*/
                        if(cb_struct.func)
                            except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI, src_id, dst_id,
                                    src, d, cb_struct.user_data);

                        if(except_ret == H5T_CONV_UNHANDLED)
                            HDmemset(d, 0xff, dst->shared->size);
                        else if(except_ret == H5T_CONV_ABORT)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                    } /* end if */
                    else {
                        HDassert(priv->src2dst[md] >= 0);
                        H5MM_memcpy(d,
                                 (uint8_t *)dst->shared->u.enumer.value + ((unsigned)priv->src2dst[md] * dst->shared->size),
                                 dst->shared->size);
                    } /* end else */
                } /* end else */
            }

            break;

        default:
            /* Some other command we don't know about yet.*/
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    } /* end switch */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_enum() */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_enum_numeric
 *
 * Purpose:	Converts enumerated data to a numeric type (integer or 
 *              floating-point number). This function is registered into 
 *              the conversion table twice in H5T_init_interface in H5T.c.  
 *              Once for enum-integer conversion. Once for enum-float conversion.
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Raymond Lu
 *              12 October 2012
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_enum_numeric(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
	      size_t H5_ATTR_UNUSED buf_stride, size_t H5_ATTR_UNUSED bkg_stride, void *_buf,
              void H5_ATTR_UNUSED *bkg)
{
    H5T_t	*src, *dst;		/*src and dst datatypes	*/
    H5T_t	*src_parent;		/*parent type for src           */
    hid_t       src_parent_id = -1;     /*ID for parent of the source   */
    H5T_path_t  *tpath;                 /* Conversion information       */
    herr_t      ret_value = SUCCEED;    /* Return value                 */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            /*
             * Determine if this conversion function applies to the conversion
             * path SRC_ID->DST_ID.  If not, return failure.
             */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a datatype")
            if(H5T_ENUM != src->shared->type)
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "source type is not a H5T_ENUM datatype")
            if(H5T_INTEGER != dst->shared->type && H5T_FLOAT != dst->shared->type)
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "destination is not an integer type")

            cdata->need_bkg = H5T_BKG_NO;
            break;

        case H5T_CONV_FREE:
            break;

        case H5T_CONV_CONV:
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")

            src_parent = src->shared->parent;

            if(NULL == (tpath = H5T_path_find(src_parent, dst))) {
                HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, FAIL, "unable to convert between src and dest datatype")
            } else if(!H5T_path_noop(tpath)) {
                if((src_parent_id = H5I_register(H5I_DATATYPE, H5T_copy(src_parent, H5T_COPY_ALL), FALSE)) < 0) 
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTREGISTER, FAIL, "unable to register types for conversion")

                /* Convert the data */
                if(H5T_convert(tpath, src_parent_id, dst_id, nelmts, buf_stride, bkg_stride, _buf, bkg) < 0)
                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "datatype conversion failed")
            }
            break;

        default:
            /* Some other command we don't know about yet.*/
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    } /* end switch */

done:
    /* Release the temporary datatype IDs used */
    if(src_parent_id >= 0)
        H5I_dec_ref(src_parent_id);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_enum_numeric() */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_vlen
 *
 * Purpose:	Converts between VL datatypes in memory and on disk.
 *		This is a soft conversion function.  The algorithm is
 *		basically:
 *
 *      	For every VL struct in the main buffer:
 *		  1. Allocate space for temporary dst VL data (reuse buffer
 *		     if possible)
 *                2. Copy VL data from src buffer into dst buffer
 *                3. Convert VL data into dst representation
 *                4. Allocate buffer in dst heap
 *		  5. Free heap objects storing old data
 *                6. Write dst VL data into dst heap
 *                7. Store (heap ID or pointer) and length in main dst buffer
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		Wednesday, May 26, 1999
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_vlen(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
    size_t buf_stride, size_t bkg_stride, void *buf, void *bkg)
{
    H5T_vlen_alloc_info_t vl_alloc_info;/* VL allocation info */
    H5T_path_t	*tpath = NULL;		/* Type conversion path		     */
    hbool_t     noop_conv = FALSE;      /* Flag to indicate a noop conversion */
    hbool_t     write_to_file = FALSE;  /* Flag to indicate writing to file */
    htri_t      parent_is_vlen;         /* Flag to indicate parent is vlen datatyp */
    size_t	bg_seq_len = 0;         /* The number of elements in the background sequence */
    hid_t   	tsrc_id = -1, tdst_id = -1;/*temporary type atoms	     */
    H5T_t	*src = NULL;		/*source datatype		     */
    H5T_t	*dst = NULL;		/*destination datatype		     */
    uint8_t	*s = NULL;		/*source buffer			*/
    uint8_t	*d = NULL;		/*destination buffer		*/
    uint8_t	*b = NULL;		/*background buffer		*/
    ssize_t	s_stride, d_stride;	/*src and dst strides		*/
    ssize_t	b_stride;	        /*bkg stride			*/
    size_t      safe;                   /*how many elements are safe to process in each pass */
    size_t	src_base_size, dst_base_size;/*source & destination base size*/
    void	*conv_buf = NULL;     	/*temporary conversion buffer 	     */
    size_t	conv_buf_size = 0;  	/*size of conversion buffer in bytes */
    void	*tmp_buf = NULL;     	/*temporary background buffer 	     */
    size_t	tmp_buf_size = 0;	/*size of temporary bkg buffer	     */
    hbool_t     nested = FALSE;         /*flag of nested VL case             */
    size_t	elmtno;			/*element number counter	     */
    herr_t      ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            /*
             * First, determine if this conversion function applies to the
             * conversion path SRC_ID-->DST_ID.  If not, return failure;
             * otherwise initialize the `priv' field of `cdata' with
             * information that remains (almost) constant for this
             * conversion path.
             */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a datatype")
            if(H5T_VLEN != src->shared->type)
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a H5T_VLEN datatype")
            if(H5T_VLEN != dst->shared->type)
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a H5T_VLEN datatype")
            if(H5T_VLEN_STRING == src->shared->u.vlen.type && H5T_VLEN_STRING == dst->shared->u.vlen.type) {
                if((H5T_CSET_ASCII == src->shared->u.vlen.cset && H5T_CSET_UTF8 == dst->shared->u.vlen.cset) 
                        || (H5T_CSET_ASCII == dst->shared->u.vlen.cset && H5T_CSET_UTF8 == src->shared->u.vlen.cset))
                    HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "The library doesn't convert between strings of ASCII and UTF")
            } /* end if */

            /* Variable-length types don't need a background buffer */
            cdata->need_bkg = H5T_BKG_NO;

            break;

        case H5T_CONV_FREE:
            /* QAK - Nothing to do currently */
            break;

        case H5T_CONV_CONV:
            /*
             * Conversion.
             */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")

            /* Initialize source & destination strides */
            if(buf_stride) {
                HDassert(buf_stride >= src->shared->size);
                HDassert(buf_stride >= dst->shared->size);
                H5_CHECK_OVERFLOW(buf_stride, size_t, ssize_t);
                s_stride = d_stride = (ssize_t)buf_stride;
            } /* end if */
            else {
                H5_CHECK_OVERFLOW(src->shared->size, size_t, ssize_t);
                H5_CHECK_OVERFLOW(dst->shared->size, size_t, ssize_t);
                s_stride = (ssize_t)src->shared->size;
                d_stride = (ssize_t)dst->shared->size;
            } /* end else */
            if(bkg) {
                if(bkg_stride)
                    b_stride = (ssize_t)bkg_stride;
                else
                    b_stride = d_stride;
            } /* end if */
            else
                b_stride = 0;

            /* Get the size of the base types in src & dst */
            src_base_size = H5T_get_size(src->shared->parent);
            dst_base_size = H5T_get_size(dst->shared->parent);

            /* Set up conversion path for base elements */
            if(NULL == (tpath = H5T_path_find(src->shared->parent, dst->shared->parent)))
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unable to convert between src and dest datatypes")
            else if(!H5T_path_noop(tpath)) {
                if((tsrc_id = H5I_register(H5I_DATATYPE, H5T_copy(src->shared->parent, H5T_COPY_ALL), FALSE)) < 0 ||
                        (tdst_id = H5I_register(H5I_DATATYPE, H5T_copy(dst->shared->parent, H5T_COPY_ALL), FALSE)) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTREGISTER, FAIL, "unable to register types for conversion")
            } /* end else-if */
            else
                noop_conv = TRUE;

            /* Check if we need a temporary buffer for this conversion */
            if((parent_is_vlen = H5T_detect_class(dst->shared->parent, H5T_VLEN, FALSE)) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_SYSTEM, FAIL, "internal error when detecting variable-length class")
            if(tpath->cdata.need_bkg || parent_is_vlen) {
                /* Set up initial background buffer */
                tmp_buf_size = MAX(src_base_size, dst_base_size);
                if(NULL == (tmp_buf = H5FL_BLK_CALLOC(vlen_seq,tmp_buf_size)))
                    HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL, "memory allocation failed for type conversion")
            } /* end if */

            /* Get the allocation info */
            if(H5CX_get_vlen_alloc_info(&vl_alloc_info) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "unable to retrieve VL allocation info")

            /* Set flags to indicate we are writing to or reading from the file */
            if(dst->shared->u.vlen.file != NULL)
                write_to_file = TRUE;

            /* Set the flag for nested VL case */
            if(write_to_file && parent_is_vlen && bkg != NULL)
                nested = TRUE;

            /* The outer loop of the type conversion macro, controlling which */
            /* direction the buffer is walked */
            while(nelmts > 0) {
                /* Check if we need to go backwards through the buffer */
                if(d_stride > s_stride) {
                    /* Sanity check */
                    HDassert(s_stride > 0);
                    HDassert(d_stride > 0);
                    HDassert(b_stride >= 0);

                    /* Compute the number of "safe" destination elements at */
                    /* the end of the buffer (Those which don't overlap with */
                    /* any source elements at the beginning of the buffer) */
                    safe = nelmts - (((nelmts * (size_t)s_stride) + ((size_t)d_stride - 1)) / (size_t)d_stride);

                    /* If we're down to the last few elements, just wrap up */
                    /* with a "real" reverse copy */
                    if(safe < 2) {
                        s = (uint8_t *)buf + (nelmts - 1) * (size_t)s_stride;
                        d = (uint8_t *)buf + (nelmts - 1) * (size_t)d_stride;
                        b = (uint8_t *)bkg + (nelmts - 1) * (size_t)b_stride;
                        s_stride = -s_stride;
                        d_stride = -d_stride;
                        b_stride = -b_stride;

                        safe = nelmts;
                    } /* end if */
                    else {
                        s = (uint8_t *)buf + (nelmts - safe) * (size_t)s_stride;
                        d = (uint8_t *)buf + (nelmts - safe) * (size_t)d_stride;
                        b = (uint8_t *)bkg + (nelmts - safe) * (size_t)b_stride;
                    } /* end else */
                } /* end if */
                else {
                    /* Single forward pass over all data */
                    s = d = (uint8_t *)buf;
                    b = (uint8_t *)bkg;
                    safe = nelmts;
                } /* end else */

                for(elmtno = 0; elmtno < safe; elmtno++) {
                    hbool_t is_nil;      /* Whether sequence is "nil" */

                    /* Check for "nil" source sequence */
                    if((*(src->shared->u.vlen.cls->isnull))(src->shared->u.vlen.file, s, &is_nil) < 0)
                        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "can't check if VL data is 'nil'")
                    else if(is_nil) {
                        /* Write "nil" sequence to destination location */
                        if((*(dst->shared->u.vlen.cls->setnull))(dst->shared->u.vlen.file, d, b) < 0)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_WRITEERROR, FAIL, "can't set VL data to 'nil'")
                    } /* end else-if */
                    else {
                        size_t 	seq_len;    /* The number of elements in the current sequence */

                        /* Get length of element sequences */
                        if((*(src->shared->u.vlen.cls->getlen))(src->shared->u.vlen.file, s, &seq_len) < 0)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "bad sequence length")

                        /* If we are reading from memory and there is no conversion, just get the pointer to sequence */
                        if(write_to_file && noop_conv) {
                            /* Get direct pointer to sequence */
                            if(NULL == (conv_buf = (*(src->shared->u.vlen.cls->getptr))(s)))
                                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid source pointer")
                        } /* end if */
                        else {
                            size_t	src_size, dst_size;     /*source & destination total size in bytes*/

                            src_size = seq_len * src_base_size;
                            dst_size = seq_len * dst_base_size;

                            /* Check if conversion buffer is large enough, resize if
                             * necessary.  If the SEQ_LEN is 0, allocate a minimal size buffer.
                             */
			    if(!seq_len && !conv_buf) {
                                conv_buf_size = ((1 / H5T_VLEN_MIN_CONF_BUF_SIZE) + 1) * H5T_VLEN_MIN_CONF_BUF_SIZE;
                                if(NULL == (conv_buf = H5FL_BLK_CALLOC(vlen_seq, conv_buf_size)))
                                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for type conversion")
			    } /* end if */
                            else if(conv_buf_size < MAX(src_size, dst_size)) {
                                /* Only allocate conversion buffer in H5T_VLEN_MIN_CONF_BUF_SIZE increments */
                                conv_buf_size = ((MAX(src_size, dst_size) / H5T_VLEN_MIN_CONF_BUF_SIZE) + 1) * H5T_VLEN_MIN_CONF_BUF_SIZE;
                                if(NULL == (conv_buf = H5FL_BLK_REALLOC(vlen_seq, conv_buf, conv_buf_size)))
                                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for type conversion")
                                HDmemset(conv_buf, 0, conv_buf_size);
                            } /* end else-if */

                            /* Read in VL sequence */
                            if((*(src->shared->u.vlen.cls->read))(src->shared->u.vlen.file, s, conv_buf, src_size) < 0)
                                HGOTO_ERROR(H5E_DATATYPE, H5E_READERROR, FAIL, "can't read VL data")
                        } /* end else */

                        if(!noop_conv) {
                            /* Check if temporary buffer is large enough, resize if necessary */
                            /* (Chain off the conversion buffer size) */
                            if(tmp_buf && tmp_buf_size < conv_buf_size) {
                                /* Set up initial background buffer */
                                tmp_buf_size = conv_buf_size;
                                if(NULL == (tmp_buf = H5FL_BLK_REALLOC(vlen_seq, tmp_buf, tmp_buf_size)))
                                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for type conversion")
                                HDmemset(tmp_buf, 0, tmp_buf_size);
                            } /* end if */

                            /* If we are writing and there is a nested VL type, read
                             * the sequence into the background buffer */
                            if(nested) {
                                /* Sanity check */
                                HDassert(write_to_file);

                                /* Get length of background element sequence */
                                if((*(dst->shared->u.vlen.cls->getlen))(dst->shared->u.vlen.file, b, &bg_seq_len) < 0)
                                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "bad sequence length")

                                /* Read sequence if length > 0 */
                                if(bg_seq_len > 0) {
                                    if(tmp_buf_size < (bg_seq_len * MAX(src_base_size, dst_base_size))) {
                                        tmp_buf_size = (bg_seq_len * MAX(src_base_size, dst_base_size));
                                        if(NULL == (tmp_buf = H5FL_BLK_REALLOC(vlen_seq, tmp_buf, tmp_buf_size)))
                                            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for type conversion")
                                        HDmemset(tmp_buf, 0, tmp_buf_size);
                                    } /* end if */

                                    /* Read in background VL sequence */
                                    if((*(dst->shared->u.vlen.cls->read))(dst->shared->u.vlen.file, b, tmp_buf, bg_seq_len * dst_base_size) < 0)
                                        HGOTO_ERROR(H5E_DATATYPE, H5E_READERROR, FAIL, "can't read VL data")
                                } /* end if */

                                /* If the sequence gets shorter, pad out the original sequence with zeros */
                                if(bg_seq_len < seq_len)
                                    HDmemset((uint8_t *)tmp_buf + dst_base_size * bg_seq_len, 0, (seq_len - bg_seq_len) * dst_base_size);
                            } /* end if */

                            /* Convert VL sequence */
                            if(H5T_convert(tpath, tsrc_id, tdst_id, seq_len, (size_t)0, (size_t)0, conv_buf, tmp_buf) < 0)
                                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "datatype conversion failed")
                        } /* end if */

                        /* Write sequence to destination location */
                        if((*(dst->shared->u.vlen.cls->write))(dst->shared->u.vlen.file, &vl_alloc_info, d, conv_buf, b, seq_len, dst_base_size) < 0)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_WRITEERROR, FAIL, "can't write VL data")

                        if(!noop_conv) {
                            /* For nested VL case, free leftover heap objects from the deeper level if the length of new data elements is shorter than the old data elements.*/
                            if(nested && seq_len < bg_seq_len) {
                                const uint8_t *tmp;
                                size_t u;

                                /* Sanity check */
                                HDassert(write_to_file);

                                tmp = (uint8_t *)tmp_buf + seq_len * dst_base_size;
                                for(u = seq_len; u < bg_seq_len; u++, tmp += dst_base_size) {
                                    /* Delete sequence in destination location */
                                    if((*(dst->shared->u.vlen.cls->del))(dst->shared->u.vlen.file, tmp) < 0)
                                        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREMOVE, FAIL, "unable to remove heap object")
                                } /* end for */
                            } /* end if */
                        } /* end if */
                    } /* end else */

                    /* Advance pointers */
                    s += s_stride;
                    d += d_stride;
                    b += b_stride;
                } /* end for */

                /* Decrement number of elements left to convert */
                nelmts -= safe;
            } /* end while */

            /* Release the temporary datatype IDs used */
            if(tsrc_id >= 0)
                H5I_dec_ref(tsrc_id);
            if(tdst_id >= 0)
                H5I_dec_ref(tdst_id);
            break;

        default:    /* Some other command we don't know about yet.*/
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    }   /* end switch */

done:
    /* If the conversion buffer doesn't need to be freed, reset its pointer */
    if(write_to_file && noop_conv)
        conv_buf = NULL;
    /* Release the conversion buffer (always allocated, except on errors) */
    if(conv_buf)
        conv_buf = H5FL_BLK_FREE(vlen_seq, conv_buf);
    /* Release the background buffer, if we have one */
    if(tmp_buf)
        tmp_buf = H5FL_BLK_FREE(vlen_seq, tmp_buf);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_vlen() */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_array
 *
 * Purpose:	Converts between array datatypes in memory and on disk.
 *		This is a soft conversion function.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		Monday, November 6, 2000
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_array(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
    size_t buf_stride, size_t bkg_stride, void *_buf, void H5_ATTR_UNUSED *_bkg)
{
    H5T_path_t	*tpath;		        /* Type conversion path		     */
    hid_t       tsrc_id = -1, tdst_id = -1;/*temporary type atoms	     */
    H5T_t	*src = NULL;	        /*source datatype		     */
    H5T_t	*dst = NULL;	        /*destination datatype		     */
    uint8_t	*sp, *dp;	        /*source and dest traversal ptrs     */
    ssize_t	src_delta, dst_delta;	/*source & destination stride	     */
    int	        direction;		/*direction of traversal	     */
    size_t	elmtno;			/*element number counter	     */
    unsigned    u;                      /* local index variable */
    void	*bkg_buf = NULL;     	/*temporary background buffer 	     */
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_PACKAGE

    switch (cdata->command) {
        case H5T_CONV_INIT:
            /*
             * First, determine if this conversion function applies to the
             * conversion path SRC_ID-->DST_ID.  If not, return failure;
             * otherwise initialize the `priv' field of `cdata' with
             * information that remains (almost) constant for this
             * conversion path.
             */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
            HDassert(H5T_ARRAY==src->shared->type);
            HDassert(H5T_ARRAY==dst->shared->type);

            /* Check the number and sizes of the dimensions */
            if(src->shared->u.array.ndims != dst->shared->u.array.ndims)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "array datatypes do not have the same number of dimensions")
            for(u = 0; u < src->shared->u.array.ndims; u++)
                if(src->shared->u.array.dim[u] != dst->shared->u.array.dim[u])
                    HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "array datatypes do not have the same sizes of dimensions")

            /* Array datatypes don't need a background buffer */
            cdata->need_bkg = H5T_BKG_NO;

            break;

        case H5T_CONV_FREE:
            /* QAK - Nothing to do currently */
            break;

        case H5T_CONV_CONV:
            /*
             * Conversion.
             */
            if (NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")

            /*
             * Do we process the values from beginning to end or vice
             * versa? Also, how many of the elements have the source and
             * destination areas overlapping?
             */
            if(src->shared->size >= dst->shared->size || buf_stride > 0) {
                sp = dp = (uint8_t*)_buf;
                direction = 1;
            } else {
                sp = (uint8_t*)_buf + (nelmts - 1) *
                     (buf_stride ? buf_stride : src->shared->size);
                dp = (uint8_t*)_buf + (nelmts - 1) *
                     (buf_stride ? buf_stride : dst->shared->size);
                direction = -1;
            }

            /*
             * Direction & size of buffer traversal.
             */
            H5_CHECK_OVERFLOW(buf_stride, size_t, ssize_t);
            H5_CHECK_OVERFLOW(src->shared->size, size_t, ssize_t);
            H5_CHECK_OVERFLOW(dst->shared->size, size_t, ssize_t);
            src_delta = (ssize_t)direction * (ssize_t)(buf_stride ? buf_stride : src->shared->size);
            dst_delta = (ssize_t)direction * (ssize_t)(buf_stride ? buf_stride : dst->shared->size);

            /* Set up conversion path for base elements */
            if(NULL == (tpath = H5T_path_find(src->shared->parent, dst->shared->parent))) {
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unable to convert between src and dest datatypes")
            } else if (!H5T_path_noop(tpath)) {
                if((tsrc_id = H5I_register(H5I_DATATYPE, H5T_copy(src->shared->parent, H5T_COPY_ALL), FALSE)) < 0 ||
                        (tdst_id = H5I_register(H5I_DATATYPE, H5T_copy(dst->shared->parent, H5T_COPY_ALL), FALSE)) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTREGISTER, FAIL, "unable to register types for conversion")
            }

            /* Check if we need a background buffer for this conversion */
            if(tpath->cdata.need_bkg) {
                size_t	bkg_buf_size;	        /*size of background buffer in bytes */

                /* Allocate background buffer */
                bkg_buf_size = src->shared->u.array.nelem * MAX(src->shared->size, dst->shared->size);
                if(NULL == (bkg_buf = H5FL_BLK_CALLOC(array_seq, bkg_buf_size)))
                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for type conversion")
            } /* end if */

            /* Perform the actual conversion */
            for(elmtno = 0; elmtno < nelmts; elmtno++) {
                /* Copy the source array into the correct location for the destination */
                HDmemmove(dp, sp, src->shared->size);

                /* Convert array */
                if(H5T_convert(tpath, tsrc_id, tdst_id, src->shared->u.array.nelem, (size_t)0, bkg_stride, dp, bkg_buf) < 0)
                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "datatype conversion failed")

                /* Advance the source & destination pointers */
                sp += src_delta;
                dp += dst_delta;
            } /* end for */

            /* Release the temporary datatype IDs used */
            if(tsrc_id >= 0)
                H5I_dec_ref(tsrc_id);
            if(tdst_id >= 0)
                H5I_dec_ref(tdst_id);
            break;

        default:    /* Some other command we don't know about yet.*/
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    } /* end switch */

done:
    /* Release the background buffer, if we have one */
    if(bkg_buf)
        bkg_buf = H5FL_BLK_FREE(array_seq, bkg_buf);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_array() */

/*-------------------------------------------------------------------------
 * Function:    H5T__conv_ref
 *
 * Purpose: Converts between reference datatypes in memory and on disk.
 *      This is a soft conversion function.
 *
 * Return:  Non-negative on success/Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ref(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
    size_t buf_stride, size_t bkg_stride, void *buf, void *bkg)
{
    H5T_t   *src = NULL;        /* source datatype                      */
    H5T_t   *dst = NULL;        /* destination datatype                 */
    uint8_t *s = NULL;          /* source buffer                        */
    uint8_t *d = NULL;          /* destination buffer                   */
    uint8_t *b = NULL;          /* background buffer                    */
    ssize_t s_stride, d_stride; /* src and dst strides                  */
    ssize_t b_stride;           /* bkg stride                           */
    size_t  safe;               /* how many elements are safe to process in each pass */
    void    *conv_buf = NULL;   /* temporary conversion buffer          */
    size_t  conv_buf_size = 0;  /* size of conversion buffer in bytes   */
    size_t  elmtno;             /* element number counter               */
    herr_t ret_value = SUCCEED; /* return value                         */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            /*
             * First, determine if this conversion function applies to the
             * conversion path SRC_ID-->DST_ID.  If not, return failure;
             * otherwise initialize the `priv' field of `cdata' with
             * information that remains (almost) constant for this
             * conversion path.
             */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a datatype")
            if(H5T_REFERENCE != src->shared->type)
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a H5T_REFERENCE datatype")
            if(H5T_REFERENCE != dst->shared->type)
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not a H5T_REFERENCE datatype")
            /* Only allow for source reference that is not an opaque type, destination must be opaque */
            if(!dst->shared->u.atomic.u.r.opaque)
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADTYPE, FAIL, "not an H5T_STD_REF datatype")

            /* Reference types don't need a background buffer */
            cdata->need_bkg = H5T_BKG_NO;
            break;

        case H5T_CONV_FREE:
            break;

        case H5T_CONV_CONV:
        {
            /*
             * Conversion.
             */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")

            HDassert(src->shared->u.atomic.u.r.cls);

            /* Initialize source & destination strides */
            if(buf_stride) {
                HDassert(buf_stride >= src->shared->size);
                HDassert(buf_stride >= dst->shared->size);
                H5_CHECK_OVERFLOW(buf_stride, size_t, ssize_t);
                s_stride = d_stride = (ssize_t)buf_stride;
            } /* end if */
            else {
                H5_CHECK_OVERFLOW(src->shared->size, size_t, ssize_t);
                H5_CHECK_OVERFLOW(dst->shared->size, size_t, ssize_t);
                s_stride = (ssize_t)src->shared->size;
                d_stride = (ssize_t)dst->shared->size;
            } /* end else */
            if(bkg) {
                if(bkg_stride)
                    b_stride = (ssize_t)bkg_stride;
                else
                    b_stride = d_stride;
            } /* end if */
            else
                b_stride = 0;

            /* The outer loop of the type conversion macro, controlling which */
            /* direction the buffer is walked */
            while(nelmts > 0) {
                /* Check if we need to go backwards through the buffer */
                if(d_stride > s_stride) {
                    /* Sanity check */
                    HDassert(s_stride > 0);
                    HDassert(d_stride > 0);
                    HDassert(b_stride >= 0);

                    /* Compute the number of "safe" destination elements at */
                    /* the end of the buffer (Those which don't overlap with */
                    /* any source elements at the beginning of the buffer) */
                    safe = nelmts - (((nelmts * (size_t)s_stride) + ((size_t)d_stride - 1)) / (size_t)d_stride);

                    /* If we're down to the last few elements, just wrap up */
                    /* with a "real" reverse copy */
                    if(safe < 2) {
                        s = (uint8_t *)buf + (nelmts - 1) * (size_t)s_stride;
                        d = (uint8_t *)buf + (nelmts - 1) * (size_t)d_stride;
                        b = (uint8_t *)bkg + (nelmts - 1) * (size_t)b_stride;
                        s_stride = -s_stride;
                        d_stride = -d_stride;
                        b_stride = -b_stride;

                        safe = nelmts;
                    } /* end if */
                    else {
                        s = (uint8_t *)buf + (nelmts - safe) * (size_t)s_stride;
                        d = (uint8_t *)buf + (nelmts - safe) * (size_t)d_stride;
                        b = (uint8_t *)bkg + (nelmts - safe) * (size_t)b_stride;
                    } /* end else */
                } /* end if */
                else {
                    /* Single forward pass over all data */
                    s = d = (uint8_t *)buf;
                    b = (uint8_t *)bkg;
                    safe = nelmts;
                } /* end else */

                for(elmtno = 0; elmtno < safe; elmtno++) {
                    size_t buf_size;
                    hbool_t dst_copy = FALSE;
                    hbool_t is_nil;     /* Whether reference is "nil" */

                    /* Check for "nil" source reference */
                    if((*(src->shared->u.atomic.u.r.cls->isnull))(src->shared->u.atomic.u.r.file, s, &is_nil) < 0)
                        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "can't check if reference data is 'nil'")

                    if(is_nil) {
                        /* Write "nil" reference to destination location */
                        if((*(dst->shared->u.atomic.u.r.cls->setnull))(dst->shared->u.atomic.u.r.file, d, b) < 0)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_WRITEERROR, FAIL, "can't set reference data to 'nil'")
                    } /* end else-if */
                    else {
                        /* Get size of references */
                        if(0 == (buf_size = src->shared->u.atomic.u.r.cls->getsize(
                                src->shared->u.atomic.u.r.file, s, src->shared->size,
                                dst->shared->u.atomic.u.r.file, &dst_copy)))
                            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "incorrect size")

                        /* Check if conversion buffer is large enough, resize if necessary. */
                        if(conv_buf_size < buf_size) {
                            conv_buf_size = buf_size;
                            if(NULL == (conv_buf = H5FL_BLK_REALLOC(ref_seq, conv_buf, conv_buf_size)))
                                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for type conversion")
                            HDmemset(conv_buf, 0, conv_buf_size);
                        } /* end if */

                        if(dst_copy && (src->shared->u.atomic.u.r.loc == H5T_LOC_DISK))
                            H5MM_memcpy(conv_buf, s, buf_size);
                        else {
                            /* Read reference */
                            if(src->shared->u.atomic.u.r.cls->read(
                                    src->shared->u.atomic.u.r.file, s, src->shared->size,
                                    dst->shared->u.atomic.u.r.file, conv_buf, buf_size) < 0)
                                HGOTO_ERROR(H5E_DATATYPE, H5E_READERROR, FAIL, "can't read reference data")
                        } /* end else */

                        if(dst_copy && (dst->shared->u.atomic.u.r.loc == H5T_LOC_DISK))
                            H5MM_memcpy(d, conv_buf, buf_size);
                        else {
                            /* Write reference to destination location */
                            if(dst->shared->u.atomic.u.r.cls->write(
                                    src->shared->u.atomic.u.r.file, conv_buf, buf_size, src->shared->u.atomic.u.r.rtype,
                                    dst->shared->u.atomic.u.r.file, d, dst->shared->size, b) < 0)
                                HGOTO_ERROR(H5E_DATATYPE, H5E_WRITEERROR, FAIL, "can't write reference data")
                        } /* end else */
                    } /* end else */

                    /* Advance pointers */
                    s += s_stride;
                    d += d_stride;
                    b += b_stride;
                } /* end for */

                /* Decrement number of elements left to convert */
                nelmts -= safe;
            } /* end while */
        } /* end case */
            break;

        default:    /* Some other command we don't know about yet.*/
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    }   /* end switch */

done:
    /* Release the conversion buffer (always allocated, except on errors) */
    if(conv_buf)
        conv_buf = H5FL_BLK_FREE(ref_seq, conv_buf);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_ref() */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_i_i
 *
 * Purpose:	Convert one integer type to another.  This is the catch-all
 *		function for integer conversions and is probably not
 *		particularly fast.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Wednesday, June 10, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_i_i(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
    size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride, void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_t	*src = NULL;		/*source datatype		*/
    H5T_t	*dst = NULL;		/*destination datatype		*/
    ssize_t	src_delta, dst_delta;	/*source & destination stride	*/
    int		direction;		/*direction of traversal	*/
    size_t	elmtno;			/*element number		*/
    size_t	half_size;		/*half the type size		*/
    size_t	olap;			/*num overlapping elements	*/
    uint8_t	*s, *sp, *d, *dp;	/*source and dest traversal ptrs*/
    uint8_t     *src_rev=NULL;          /*order-reversed source buffer  */
    uint8_t	dbuf[64];		/*temp destination buffer	*/
    size_t	first;
    ssize_t	sfirst;			/*a signed version of `first'	*/
    size_t	i;                      /*Local index variables         */
    H5T_conv_cb_t       cb_struct={NULL, NULL};      /*conversion callback structure */
    H5T_conv_ret_t      except_ret;     /*return of callback function   */
    hbool_t             reverse;        /*if reverse the order of destination        */
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
            if(H5T_ORDER_LE != src->shared->u.atomic.order && H5T_ORDER_BE != src->shared->u.atomic.order)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unsupported byte order")
            if(H5T_ORDER_LE != dst->shared->u.atomic.order && H5T_ORDER_BE != dst->shared->u.atomic.order)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unsupported byte order")
            if(dst->shared->size > sizeof dbuf)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "destination size is too large")
            cdata->need_bkg = H5T_BKG_NO;
            break;

        case H5T_CONV_FREE:
            break;

        case H5T_CONV_CONV:
            /* Get the datatypes */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")

            /*
             * Do we process the values from beginning to end or vice versa? Also,
             * how many of the elements have the source and destination areas
             * overlapping?
             */
            if (src->shared->size==dst->shared->size || buf_stride) {
                sp = dp = (uint8_t*)buf;
                direction = 1;
                olap = nelmts;
            } else if (src->shared->size>=dst->shared->size) {
                double olap_d = HDceil((double)(dst->shared->size)/
                                       (double)(src->shared->size-dst->shared->size));

                olap = (size_t)olap_d;
                sp = dp = (uint8_t*)buf;
                direction = 1;
            } else {
                double olap_d = HDceil((double)(src->shared->size)/
                                       (double)(dst->shared->size-src->shared->size));
                olap = (size_t)olap_d;
                sp = (uint8_t*)buf + (nelmts - 1) * src->shared->size;
                dp = (uint8_t*)buf + (nelmts - 1) * dst->shared->size;
                direction = -1;
            }

            /*
             * Direction & size of buffer traversal.
             */
            H5_CHECK_OVERFLOW(buf_stride, size_t, ssize_t);
            H5_CHECK_OVERFLOW(src->shared->size, size_t, ssize_t);
            H5_CHECK_OVERFLOW(dst->shared->size, size_t, ssize_t);
            src_delta = (ssize_t)direction * (ssize_t)(buf_stride ? buf_stride : src->shared->size);
            dst_delta = (ssize_t)direction * (ssize_t)(buf_stride ? buf_stride : dst->shared->size);

            /* Get conversion exception callback property */
            if(H5CX_get_dt_conv_cb(&cb_struct) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "unable to get conversion exception callback")

            /* Allocate space for order-reversed source buffer */
            src_rev = (uint8_t*)H5MM_calloc(src->shared->size);

            /* The conversion loop */
            for(elmtno = 0; elmtno < nelmts; elmtno++) {

                /*
                 * If the source and destination buffers overlap then use a
                 * temporary buffer for the destination.
                 */
                if(direction > 0) {
                    s = sp;
                    d = elmtno < olap ? dbuf : dp;
                } else {
                    s = sp;
                    d = elmtno + olap >= nelmts ? dbuf : dp;
                }
#ifndef NDEBUG
                /* I don't quite trust the overlap calculations yet --rpm */
                if (d==dbuf) {
                    HDassert((dp>=sp && dp<sp+src->shared->size) || (sp>=dp && sp<dp+dst->shared->size));
                } else {
                    HDassert((dp<sp && dp+dst->shared->size<=sp) || (sp<dp && sp+src->shared->size<=dp));
                }
#endif

                /*
                 * Put the data in little endian order so our loops aren't so
                 * complicated.  We'll do all the conversion stuff assuming
                 * little endian and then we'll fix the order at the end.
                 */
                if (H5T_ORDER_BE==src->shared->u.atomic.order) {
                    half_size = src->shared->size/2;
                    for (i=0; i<half_size; i++) {
                        uint8_t tmp = s[src->shared->size-(i+1)];
                        s[src->shared->size-(i+1)] = s[i];
                        s[i] = tmp;
                    }
                }

                /*
                 * What is the bit number for the msb bit of S which is set? The
                 * bit number is relative to the significant part of the number.
                 */
                sfirst = H5T__bit_find (s, src->shared->u.atomic.offset, src->shared->u.atomic.prec,
                                       H5T_BIT_MSB, TRUE);
                first = (size_t)sfirst;

                /* Set these variables to default */
                except_ret = H5T_CONV_UNHANDLED;
                reverse    = TRUE;

                if (sfirst<0) {
                    /*
                     * The source has no bits set and must therefore be zero.
                     * Set the destination to zero.
                     */
                    H5T__bit_set (d, dst->shared->u.atomic.offset, dst->shared->u.atomic.prec, FALSE);

                } else if (H5T_SGN_NONE==src->shared->u.atomic.u.i.sign &&
                           H5T_SGN_NONE==dst->shared->u.atomic.u.i.sign) {
                    /*
                     * Source and destination are both unsigned, but if the
                     * source has more precision bits than the destination then
                     * it's possible to overflow.  When overflow occurs the
                     * destination will be set to the maximum possible value.
                     */
                    if (src->shared->u.atomic.prec <= dst->shared->u.atomic.prec) {
                        H5T__bit_copy (d, dst->shared->u.atomic.offset, s, src->shared->u.atomic.offset,
                              src->shared->u.atomic.prec);
                        H5T__bit_set (d, dst->shared->u.atomic.offset+src->shared->u.atomic.prec,
                             dst->shared->u.atomic.prec-src->shared->u.atomic.prec, FALSE);
                    } else if (first>=dst->shared->u.atomic.prec) {
                        /*overflow*/
                        if(cb_struct.func) { /*If user's exception handler is present, use it*/
                            H5T_reverse_order(src_rev, s, src->shared->size, src->shared->u.atomic.order); /*reverse order first*/
                            except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI, src_id, dst_id,
                                    src_rev, d, cb_struct.user_data);
                        }

                        if(except_ret == H5T_CONV_UNHANDLED) {
                            H5T__bit_set (d, dst->shared->u.atomic.offset, dst->shared->u.atomic.prec, TRUE);
                        } else if(except_ret == H5T_CONV_ABORT)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                        else if(except_ret == H5T_CONV_HANDLED)
                            /*Don't reverse because user handles it already*/
                            reverse = FALSE;
                    } else {
                        H5T__bit_copy (d, dst->shared->u.atomic.offset, s, src->shared->u.atomic.offset,
                              dst->shared->u.atomic.prec);
                    }

                } else if (H5T_SGN_2==src->shared->u.atomic.u.i.sign &&
                           H5T_SGN_NONE==dst->shared->u.atomic.u.i.sign) {
                    /*
                     * If the source is signed and the destination isn't then we
                     * can have overflow if the source contains more bits than
                     * the destination (destination is set to the maximum
                     * possible value) or overflow if the source is negative
                     * (destination is set to zero).
                     */
                    if (first+1 == src->shared->u.atomic.prec) {
                        /*overflow - source is negative*/
                        if(cb_struct.func) { /*If user's exception handler is present, use it*/
                            H5T_reverse_order(src_rev, s, src->shared->size, src->shared->u.atomic.order); /*reverse order first*/
                            except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_LOW, src_id, dst_id,
                                    src_rev, d, cb_struct.user_data);
                        }

                        if(except_ret == H5T_CONV_UNHANDLED) {
                            H5T__bit_set (d, dst->shared->u.atomic.offset, dst->shared->u.atomic.prec, FALSE);
                        } else if(except_ret == H5T_CONV_ABORT)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                        else if(except_ret == H5T_CONV_HANDLED)
                            /*Don't reverse because user handles it already*/
                            reverse = FALSE;
                    } else if (src->shared->u.atomic.prec < dst->shared->u.atomic.prec) {
                        H5T__bit_copy (d, dst->shared->u.atomic.offset, s, src->shared->u.atomic.offset,
                              src->shared->u.atomic.prec-1);
                        H5T__bit_set (d, dst->shared->u.atomic.offset+src->shared->u.atomic.prec-1,
                             (dst->shared->u.atomic.prec-src->shared->u.atomic.prec)+1, FALSE);
                    } else if (first>=dst->shared->u.atomic.prec) {
                        /*overflow - source is positive*/
                        if(cb_struct.func) { /*If user's exception handler is present, use it*/
                            H5T_reverse_order(src_rev, s, src->shared->size, src->shared->u.atomic.order); /*reverse order first*/
                            except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI, src_id, dst_id,
                                    src_rev, d, cb_struct.user_data);
                        }

                        if(except_ret == H5T_CONV_UNHANDLED)
                            H5T__bit_set (d, dst->shared->u.atomic.offset, dst->shared->u.atomic.prec, TRUE);
                        else if(except_ret == H5T_CONV_ABORT)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                        else if(except_ret == H5T_CONV_HANDLED)
                            /*Don't reverse because user handles it already*/
                            reverse = FALSE;
                    } else {
                        H5T__bit_copy (d, dst->shared->u.atomic.offset, s, src->shared->u.atomic.offset,
                              dst->shared->u.atomic.prec);
                    }

                } else if (H5T_SGN_NONE==src->shared->u.atomic.u.i.sign &&
                           H5T_SGN_2==dst->shared->u.atomic.u.i.sign) {
                    /*
                     * If the source is not signed but the destination is then
                     * overflow can occur in which case the destination is set to
                     * the largest possible value (all bits set except the msb).
                     */
                    if (first+1 >= dst->shared->u.atomic.prec) {
                        /*overflow*/
                        if(cb_struct.func) { /*If user's exception handler is present, use it*/
                            H5T_reverse_order(src_rev, s, src->shared->size, src->shared->u.atomic.order); /*reverse order first*/
                            except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI, src_id, dst_id,
                                    src_rev, d, cb_struct.user_data);
                        }

                        if(except_ret == H5T_CONV_UNHANDLED) {
                            H5T__bit_set(d, dst->shared->u.atomic.offset, dst->shared->u.atomic.prec-1, TRUE);
                            H5T__bit_set(d, (dst->shared->u.atomic.offset + dst->shared->u.atomic.prec-1), (size_t)1, FALSE);
                        } else if(except_ret == H5T_CONV_ABORT)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                        else if(except_ret == H5T_CONV_HANDLED)
                            /*Don't reverse because user handles it already*/
                            reverse = FALSE;
                    } else if (src->shared->u.atomic.prec<dst->shared->u.atomic.prec) {
                        H5T__bit_copy (d, dst->shared->u.atomic.offset, s, src->shared->u.atomic.offset,
                              src->shared->u.atomic.prec);
                        H5T__bit_set (d, dst->shared->u.atomic.offset+src->shared->u.atomic.prec,
                             dst->shared->u.atomic.prec-src->shared->u.atomic.prec, FALSE);
                    } else {
                        H5T__bit_copy (d, dst->shared->u.atomic.offset, s, src->shared->u.atomic.offset,
                              dst->shared->u.atomic.prec);
                    }
                } else if (first+1 == src->shared->u.atomic.prec) {
                    /*
                     * Both the source and the destination are signed and the
                     * source value is negative.  We could experience overflow
                     * if the destination isn't wide enough in which case the
                     * destination is set to a negative number with the largest
                     * possible magnitude.
                     */
                    ssize_t sfz = H5T__bit_find (s, src->shared->u.atomic.offset,
                                    src->shared->u.atomic.prec-1, H5T_BIT_MSB, FALSE);
                    size_t fz = (size_t)sfz;

                    if (sfz>=0 && fz+1>=dst->shared->u.atomic.prec) {
                        /*overflow*/
                        if(cb_struct.func) { /*If user's exception handler is present, use it*/
                            H5T_reverse_order(src_rev, s, src->shared->size, src->shared->u.atomic.order); /*reverse order first*/
                            except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_LOW, src_id, dst_id,
                                    src_rev, d, cb_struct.user_data);
                        }

                        if(except_ret == H5T_CONV_UNHANDLED) {
                            H5T__bit_set(d, dst->shared->u.atomic.offset, dst->shared->u.atomic.prec-1, FALSE);
                            H5T__bit_set(d, (dst->shared->u.atomic.offset + dst->shared->u.atomic.prec-1), (size_t)1, TRUE);
                        } else if(except_ret == H5T_CONV_ABORT)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                        else if(except_ret == H5T_CONV_HANDLED)
                            /*Don't reverse because user handles it already*/
                            reverse = FALSE;
                    } else if (src->shared->u.atomic.prec<dst->shared->u.atomic.prec) {
                        H5T__bit_copy (d, dst->shared->u.atomic.offset, s, src->shared->u.atomic.offset, src->shared->u.atomic.prec);
                        H5T__bit_set (d, dst->shared->u.atomic.offset+src->shared->u.atomic.prec, dst->shared->u.atomic.prec-src->shared->u.atomic.prec, TRUE);
                    } else {
                        H5T__bit_copy (d, dst->shared->u.atomic.offset, s, src->shared->u.atomic.offset, dst->shared->u.atomic.prec);
                    }

                } else {
                    /*
                     * Source and destination are both signed but the source
                     * value is positive.  We could have an overflow in which
                     * case the destination is set to the largest possible
                     * positive value.
                     */
                    if (first+1>=dst->shared->u.atomic.prec) {
                        /*overflow*/
                        if(cb_struct.func) { /*If user's exception handler is present, use it*/
                            H5T_reverse_order(src_rev, s, src->shared->size, src->shared->u.atomic.order); /*reverse order first*/
                            except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI, src_id, dst_id, src_rev, d,
                                    cb_struct.user_data);
                        }

                        if(except_ret == H5T_CONV_UNHANDLED) {
                            H5T__bit_set(d, dst->shared->u.atomic.offset, dst->shared->u.atomic.prec-1, TRUE);
                            H5T__bit_set(d, (dst->shared->u.atomic.offset + dst->shared->u.atomic.prec-1), (size_t)1, FALSE);
                        } else if(except_ret == H5T_CONV_ABORT)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                        else if(except_ret == H5T_CONV_HANDLED)
                            /*Don't reverse because user handles it already*/
                            reverse = FALSE;
                    } else if (src->shared->u.atomic.prec<dst->shared->u.atomic.prec) {
                        H5T__bit_copy (d, dst->shared->u.atomic.offset, s, src->shared->u.atomic.offset,
                              src->shared->u.atomic.prec);
                        H5T__bit_set (d, dst->shared->u.atomic.offset+src->shared->u.atomic.prec,
                             dst->shared->u.atomic.prec-src->shared->u.atomic.prec, FALSE);
                    } else {
                        H5T__bit_copy (d, dst->shared->u.atomic.offset, s, src->shared->u.atomic.offset,
                              dst->shared->u.atomic.prec);
                    }
                }

                /*
                 * Set padding areas in destination.
                 */
                if (dst->shared->u.atomic.offset>0) {
                    HDassert(H5T_PAD_ZERO==dst->shared->u.atomic.lsb_pad || H5T_PAD_ONE==dst->shared->u.atomic.lsb_pad);
                    H5T__bit_set(d, (size_t)0, dst->shared->u.atomic.offset, (hbool_t)(H5T_PAD_ONE==dst->shared->u.atomic.lsb_pad));
                }
                if (dst->shared->u.atomic.offset+dst->shared->u.atomic.prec!=8*dst->shared->size) {
                    HDassert(H5T_PAD_ZERO==dst->shared->u.atomic.msb_pad || H5T_PAD_ONE==dst->shared->u.atomic.msb_pad);
                    H5T__bit_set (d, dst->shared->u.atomic.offset+dst->shared->u.atomic.prec,
                                 8*dst->shared->size - (dst->shared->u.atomic.offset+ dst->shared->u.atomic.prec),
                                 (hbool_t)(H5T_PAD_ONE==dst->shared->u.atomic.msb_pad));
                }

                /*
                 * Put the destination in the correct byte order.  See note at
                 * beginning of loop.
                 */
                if (H5T_ORDER_BE==dst->shared->u.atomic.order && reverse) {
                    half_size = dst->shared->size/2;
                    for (i=0; i<half_size; i++) {
                        uint8_t tmp = d[dst->shared->size-(i+1)];
                        d[dst->shared->size-(i+1)] = d[i];
                        d[i] = tmp;
                    }
                }

                /*
                 * If we had used a temporary buffer for the destination then we
                 * should copy the value to the true destination buffer.
                 */
                if(d==dbuf)
                    H5MM_memcpy(dp, d, dst->shared->size);

                /* Advance source & destination pointers by delta amounts */
                sp += src_delta;
                dp += dst_delta;
            } /* end for */

            break;

        default:
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    } /* end switch */

done:
    if(src_rev)
        H5MM_free(src_rev);
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_i_i() */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_f_f
 *
 * Purpose:	Convert one floating point type to another.  This is a catch
 *		all for floating point conversions and is probably not
 *		particularly fast!
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Tuesday, June 23, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_f_f(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
    size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride, void *buf, void H5_ATTR_UNUSED *bkg)
{
    /* Traversal-related variables */
    H5T_t	*src_p;			/*source datatype		*/
    H5T_t	*dst_p;			/*destination datatype		*/
    H5T_atomic_t src;			/*atomic source info		*/
    H5T_atomic_t dst;			/*atomic destination info	*/
    ssize_t	src_delta, dst_delta;	/*source & destination stride	*/
    int	direction;		        /*forward or backward traversal	*/
    size_t	elmtno;			/*element number		*/
    size_t	half_size;		/*half the type size		*/
    size_t      tsize;                  /*type size for swapping bytes  */
    size_t	olap;			/*num overlapping elements	*/
    ssize_t	bitno = 0;		/*bit number			*/
    uint8_t	*s, *sp, *d, *dp;	/*source and dest traversal ptrs*/
    uint8_t     *src_rev = NULL;        /*order-reversed source buffer  */
    uint8_t	dbuf[64];		/*temp destination buffer	*/
    uint8_t     tmp1, tmp2;             /*temp variables for swapping bytes*/

    /* Conversion-related variables */
    int64_t	expo;			/*exponent			*/
    hssize_t	expo_max;		/*maximum possible dst exponent	*/
    size_t	msize = 0;		/*useful size of mantissa in src*/
    size_t	mpos;			/*offset to useful mant is src	*/
    uint64_t    sign;                   /*source sign bit value         */
    size_t	mrsh;			/*amount to right shift mantissa*/
    hbool_t carry = FALSE;		/*carry after rounding mantissa	*/
    size_t	i;			/*miscellaneous counters	*/
    size_t	implied;		/*destination implied bits	*/
    hbool_t     denormalized = FALSE;   /*is either source or destination denormalized?*/
    H5T_conv_cb_t       cb_struct = {NULL, NULL};      /*conversion callback structure */
    H5T_conv_ret_t      except_ret;     /*return of callback function   */
    hbool_t             reverse;        /*if reverse the order of destination        */
    herr_t      ret_value = SUCCEED;    /*return value                 */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            if(NULL == (src_p = (H5T_t *)H5I_object(src_id)) || NULL == (dst_p = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
            src = src_p->shared->u.atomic;
            dst = dst_p->shared->u.atomic;
            if(H5T_ORDER_LE != src.order && H5T_ORDER_BE != src.order && H5T_ORDER_VAX != src.order)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unsupported byte order")
            if(H5T_ORDER_LE != dst.order && H5T_ORDER_BE != dst.order && H5T_ORDER_VAX != dst.order)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unsupported byte order")
            if(dst_p->shared->size > sizeof(dbuf))
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "destination size is too large")
            if(8 * sizeof(expo) - 1 < src.u.f.esize || 8 * sizeof(expo) - 1 < dst.u.f.esize)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "exponent field is too large")
            cdata->need_bkg = H5T_BKG_NO;
            break;

        case H5T_CONV_FREE:
            break;

        case H5T_CONV_CONV:
            /* Get the datatypes */
            if(NULL == (src_p = (H5T_t *)H5I_object(src_id)) || NULL == (dst_p = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
            src = src_p->shared->u.atomic;
            dst = dst_p->shared->u.atomic;
            expo_max = ((hssize_t)1 << dst.u.f.esize) - 1;

            /*
             * Do we process the values from beginning to end or vice versa? Also,
             * how many of the elements have the source and destination areas
             * overlapping?
             */
            if (src_p->shared->size==dst_p->shared->size || buf_stride) {
                sp = dp = (uint8_t*)buf;
                direction = 1;
                olap = nelmts;
            }
            else if (src_p->shared->size>=dst_p->shared->size) {
                double olap_d = HDceil((double)(dst_p->shared->size)/
                                       (double)(src_p->shared->size-dst_p->shared->size));
                olap = (size_t)olap_d;
                sp = dp = (uint8_t*)buf;
                direction = 1;
            }
            else {
                double olap_d = HDceil((double)(src_p->shared->size)/
                                       (double)(dst_p->shared->size-src_p->shared->size));
                olap = (size_t)olap_d;
                sp = (uint8_t*)buf + (nelmts-1) * src_p->shared->size;
                dp = (uint8_t*)buf + (nelmts-1) * dst_p->shared->size;
                direction = -1;
            }

            /*
             * Direction & size of buffer traversal.
             */
            H5_CHECK_OVERFLOW(buf_stride, size_t, ssize_t);
            H5_CHECK_OVERFLOW(src_p->shared->size, size_t, ssize_t);
            H5_CHECK_OVERFLOW(dst_p->shared->size, size_t, ssize_t);
            src_delta = (ssize_t)direction * (ssize_t)(buf_stride ? buf_stride : src_p->shared->size);
            dst_delta = (ssize_t)direction * (ssize_t)(buf_stride ? buf_stride : dst_p->shared->size);

            /* Get conversion exception callback property */
            if(H5CX_get_dt_conv_cb(&cb_struct) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "unable to get conversion exception callback")

            /* Allocate space for order-reversed source buffer */
            src_rev = (uint8_t*)H5MM_calloc(src_p->shared->size);

            /* The conversion loop */
            for (elmtno=0; elmtno<nelmts; elmtno++) {
                /* Set these variables to default */
                except_ret = H5T_CONV_UNHANDLED;
                reverse    = TRUE;

                /*
                 * If the source and destination buffers overlap then use a
                 * temporary buffer for the destination.
                 */
                if (direction>0) {
                    s = sp;
                    d = elmtno<olap ? dbuf : dp;
                }
                else {
                    s = sp;
                    d = elmtno+olap >= nelmts ? dbuf : dp;
                }
#ifndef NDEBUG
                /* I don't quite trust the overlap calculations yet --rpm */
                if (d==dbuf) {
                    HDassert((dp>=sp && dp<sp+src_p->shared->size) ||
                            (sp>=dp && sp<dp+dst_p->shared->size));
                }
                else {
                    HDassert((dp<sp && dp+dst_p->shared->size<=sp) ||
                            (sp<dp && sp+src_p->shared->size<=dp));
                }
#endif

                /*
                 * Put the data in little endian order so our loops aren't so
                 * complicated.  We'll do all the conversion stuff assuming
                 * little endian and then we'll fix the order at the end.
                 */
                if (H5T_ORDER_BE==src.order) {
                    half_size = src_p->shared->size/2;
                    for (i=0; i<half_size; i++) {
                        tmp1 = s[src_p->shared->size-(i+1)];
                        s[src_p->shared->size-(i+1)] = s[i];
                        s[i] = tmp1;
                    }
                }
                else if (H5T_ORDER_VAX==src.order) {
                    tsize = src_p->shared->size;
                    HDassert(0 == tsize % 2);

                    for (i = 0; i < tsize; i += 4) {
                        tmp1 = s[i];
                        tmp2 = s[i+1];

                        s[i] = s[(tsize-2)-i];
                        s[i+1] = s[(tsize-1)-i];

                        s[(tsize-2)-i] = tmp1;
                        s[(tsize-1)-i] = tmp2;
                    }
                }

                /*
                 * Find the sign bit value of the source.
                 */
                sign = H5T__bit_get_d(s, src.u.f.sign, (size_t)1);

                /*
                 * Check for special cases: +0, -0, +Inf, -Inf, NaN
                 */
                if (H5T__bit_find (s, src.u.f.mpos, src.u.f.msize,
                                  H5T_BIT_LSB, TRUE)<0) {
                    if (H5T__bit_find (s, src.u.f.epos, src.u.f.esize,
                                      H5T_BIT_LSB, TRUE)<0) {
                        /* +0 or -0 */
                        H5T__bit_copy (d, dst.u.f.sign, s, src.u.f.sign, (size_t)1);
                        H5T__bit_set (d, dst.u.f.epos, dst.u.f.esize, FALSE);
                        H5T__bit_set (d, dst.u.f.mpos, dst.u.f.msize, FALSE);
                        goto padding;
                    }
                    else if (H5T__bit_find (s, src.u.f.epos, src.u.f.esize,
                                             H5T_BIT_LSB, FALSE)<0) {
                        /* +Inf or -Inf */
                        if(cb_struct.func) { /*If user's exception handler is present, use it*/
                            /*reverse order first*/
                            H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                            if(sign)
                                except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_NINF,
                                    src_id, dst_id, src_rev, d, cb_struct.user_data);
                            else
                                except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_PINF,
                                    src_id, dst_id, src_rev, d, cb_struct.user_data);
                        }

                        if(except_ret == H5T_CONV_UNHANDLED) {
                            H5T__bit_copy (d, dst.u.f.sign, s, src.u.f.sign, (size_t)1);
                            H5T__bit_set (d, dst.u.f.epos, dst.u.f.esize, TRUE);
                            H5T__bit_set (d, dst.u.f.mpos, dst.u.f.msize, FALSE);
                            /*If the destination no implied mantissa bit, we'll need to set
                             *the 1st bit of mantissa to 1.  The Intel-Linux long double is
                             *this case.*/
                            if (H5T_NORM_NONE==dst.u.f.norm)
                                H5T__bit_set (d, dst.u.f.mpos+dst.u.f.msize-1, (size_t)1, TRUE);
                        }
                        else if(except_ret == H5T_CONV_HANDLED) {
                            /*No need to reverse the order of destination because user handles it*/
                            reverse = FALSE;
                            goto next;
                        }
                        else if(except_ret == H5T_CONV_ABORT)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")

                        goto padding;
                    }
                }
                else if (H5T_NORM_NONE==src.u.f.norm && H5T__bit_find (s, src.u.f.mpos, src.u.f.msize-1,
                                  H5T_BIT_LSB, TRUE)<0 && H5T__bit_find (s, src.u.f.epos, src.u.f.esize,
                                  H5T_BIT_LSB, FALSE)<0) {
                    /*This is a special case for the source of no implied mantissa bit.
                     *If the exponent bits are all 1s and only the 1st bit of mantissa
                     *is set to 1.  It's infinity. The Intel-Linux "long double" is this case.*/
                    /* +Inf or -Inf */
                    if(cb_struct.func) { /*If user's exception handler is present, use it*/
                        /*reverse order first*/
                        H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                        if(sign)
                            except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_NINF,
                                src_id, dst_id, src_rev, d, cb_struct.user_data);
                        else
                            except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_PINF,
                                src_id, dst_id, src_rev, d, cb_struct.user_data);
                    }

                    if(except_ret == H5T_CONV_UNHANDLED) {
                        H5T__bit_copy (d, dst.u.f.sign, s, src.u.f.sign, (size_t)1);
                        H5T__bit_set (d, dst.u.f.epos, dst.u.f.esize, TRUE);
                        H5T__bit_set (d, dst.u.f.mpos, dst.u.f.msize, FALSE);
                        /*If the destination no implied mantissa bit, we'll need to set
                         *the 1st bit of mantissa to 1.  The Intel-Linux long double is
                         *this case.*/
                        if (H5T_NORM_NONE==dst.u.f.norm)
                            H5T__bit_set (d, dst.u.f.mpos+dst.u.f.msize-1, (size_t)1, TRUE);
                    }
                    else if(except_ret == H5T_CONV_HANDLED) {
                        /*No need to reverse the order of destination because user handles it*/
                        reverse = FALSE;
                        goto next;
                    }
                    else if(except_ret == H5T_CONV_ABORT)
                        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")

                    goto padding;
                /* Temporary solution to handle VAX special values.
                 * Note that even though we don't support VAX anymore, we
                 * still need to handle legacy VAX files so this code must
                 * remain in place.
                 */
                }
                else if (H5T__bit_find (s, src.u.f.epos, src.u.f.esize,
                                         H5T_BIT_LSB, FALSE)<0) {
                    /* NaN */
                    if(cb_struct.func) { /*If user's exception handler is present, use it*/
                        /*reverse order first*/
                        H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                        except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_NAN,
                                src_id, dst_id, src_rev, d, cb_struct.user_data);
                    }

                    if(except_ret == H5T_CONV_UNHANDLED) {
                        /* There are many NaN values, so we just set all bits of
                         * the significand. */
                        H5T__bit_copy (d, dst.u.f.sign, s, src.u.f.sign, (size_t)1);
                        H5T__bit_set (d, dst.u.f.epos, dst.u.f.esize, TRUE);
                        H5T__bit_set(d, dst.u.f.mpos, dst.u.f.msize, TRUE);
                    }
                    else if(except_ret == H5T_CONV_HANDLED) {
                        /*No need to reverse the order of destination because user handles it*/
                        reverse = FALSE;
                        goto next;
                    }
                    else if(except_ret == H5T_CONV_ABORT)
                        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")

                    goto padding;
                }

                /*
                 * Get the exponent as an unsigned quantity from the section of
                 * the source bit field where it's located.	 Don't worry about
                 * the exponent bias yet.
                 */
                expo = (int64_t)H5T__bit_get_d(s, src.u.f.epos, src.u.f.esize);

                if (expo==0)
                   denormalized=TRUE;

                /*
                 * Set markers for the source mantissa, excluding the leading `1'
                 * (might be implied).
                 */
                implied = 1;
                mpos = src.u.f.mpos;
                mrsh = 0;
                if (0 == expo || H5T_NORM_NONE == src.u.f.norm) {
                    if ((bitno = H5T__bit_find(s, src.u.f.mpos, src.u.f.msize, H5T_BIT_MSB, TRUE)) > 0) {
                        msize = (size_t)bitno;
                    }
                    else if (0==bitno) {
                        msize = 1;
                        H5T__bit_set(s, src.u.f.mpos, (size_t)1, FALSE);
                    }
                }
                else if (H5T_NORM_IMPLIED==src.u.f.norm) {
                    msize = src.u.f.msize;
                }
                else {
                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "normalization method not implemented yet")
                }

                /*
                 * The sign for the destination is the same as the sign for the
                 * source in all cases.
                 */
                H5T__bit_copy (d, dst.u.f.sign, s, src.u.f.sign, (size_t)1);

                /*
                 * Calculate the true source exponent by adjusting according to
                 * the source exponent bias.
                 */
                if (0==expo || H5T_NORM_NONE==src.u.f.norm) {
                    HDassert(bitno>=0);
                    expo -= (int64_t)((src.u.f.ebias - 1) + (src.u.f.msize - (size_t)bitno));
                }
                else if (H5T_NORM_IMPLIED==src.u.f.norm) {
                    expo -= (int64_t)src.u.f.ebias;
                }
                else {
                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "normalization method not implemented yet")
                }

                /*
                 * If the destination is not normalized then right shift the
                 * mantissa by one.
                 */
                if (H5T_NORM_NONE==dst.u.f.norm)
                    mrsh++;

                /*
                 * Calculate the destination exponent by adding the destination
                 * bias and clipping by the minimum and maximum possible
                 * destination exponent values.
                 */
                expo += (int64_t)dst.u.f.ebias;

                if (expo < -(hssize_t)(dst.u.f.msize)) {
                    /* The exponent is way too small.  Result is zero. */
                    expo = 0;
                    H5T__bit_set(d, dst.u.f.mpos, dst.u.f.msize, FALSE);
                    msize = 0;
                }
                else if (expo<=0) {
                    /*
                     * The exponent is too small to fit in the exponent field,
                     * but by shifting the mantissa to the right we can
                     * accommodate that value.  The mantissa of course is no
                     * longer normalized.
                     */
                    mrsh += (size_t)(1 - expo);
                    expo = 0;
                    denormalized=TRUE;
                }
                else if (expo>=expo_max) {
                    /*
                     * The exponent is too large to fit in the available region
                     * or it results in the maximum possible value.	 Use positive
                     * or negative infinity instead unless the application
                     * specifies something else.  Before calling the overflow
                     * handler make sure the source buffer we hand it is in the
                     * original byte order.
                     */
                    if(cb_struct.func) { /*If user's exception handler is present, use it*/
                        /*reverse order first*/
                        H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                        except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI, src_id, dst_id,
                                src_rev, d, cb_struct.user_data);
                    }

                    if(except_ret == H5T_CONV_UNHANDLED) {
                        expo = expo_max;
                        H5T__bit_set(d, dst.u.f.mpos, dst.u.f.msize, FALSE);
                        msize = 0;
                    }
                    else if(except_ret == H5T_CONV_ABORT)
                        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                    else if(except_ret == H5T_CONV_HANDLED) {
                        reverse = FALSE;
                        goto next;
                    }
                }

                /*
                 * If the destination mantissa is smaller than the source
                 * mantissa then round the source mantissa. Rounding may cause a
                 * carry in which case the exponent has to be re-evaluated for
                 * overflow.  That is, if `carry' is clear then the implied
                 * mantissa bit is `1', else it is `10' binary.
                 */
                if (msize>0 && mrsh<=dst.u.f.msize && mrsh+msize>dst.u.f.msize) {
                    bitno = (ssize_t)(mrsh + msize - dst.u.f.msize);
                    HDassert(bitno >= 0 && (size_t)bitno <= msize);
                    /* If the 1st bit being cut off is set and source isn't denormalized.*/
                    if(H5T__bit_get_d(s, (mpos + (size_t)bitno) - 1, (size_t)1) && !denormalized) {
                        /* Don't do rounding if exponent is 111...110 and mantissa is 111...11.
                         * To do rounding and increment exponent in this case will create an infinity value.*/
                        if((H5T__bit_find(s, mpos + (size_t)bitno, msize - (size_t)bitno, H5T_BIT_LSB, FALSE) >= 0 || expo < expo_max - 1)) {
                            carry = H5T__bit_inc(s, mpos + (size_t)bitno - 1, 1 + msize - (size_t)bitno);
                            if(carry)
                                implied = 2;
                        }
                    }
                    else if(H5T__bit_get_d(s, (mpos + (size_t)bitno) - 1, (size_t)1) && denormalized)
                        /* For either source or destination, denormalized value doesn't increment carry.*/
                        H5T__bit_inc(s, mpos + (size_t)bitno - 1, 1 + msize - (size_t)bitno);
                }
                else
                    carry = FALSE;

                /*
                 * Write the mantissa to the destination
                 */
                if (mrsh>dst.u.f.msize+1) {
                    H5T__bit_set(d, dst.u.f.mpos, dst.u.f.msize, FALSE);
                }
                else if (mrsh==dst.u.f.msize+1) {
                    H5T__bit_set(d, dst.u.f.mpos+1, dst.u.f.msize-1, FALSE);
                    H5T__bit_set(d, dst.u.f.mpos, (size_t)1, TRUE);
                }
                else if (mrsh==dst.u.f.msize) {
                    H5T__bit_set(d, dst.u.f.mpos, dst.u.f.msize, FALSE);
                    H5T__bit_set_d(d, dst.u.f.mpos, MIN(2, dst.u.f.msize), (hsize_t)implied);
                }
                else {
                    if (mrsh>0) {
                        H5T__bit_set(d, dst.u.f.mpos+dst.u.f.msize-mrsh, mrsh,
                                    FALSE);
                        H5T__bit_set_d(d, dst.u.f.mpos+dst.u.f.msize-mrsh, (size_t)2,
                                      (hsize_t)implied);
                    }
                    if (mrsh+msize>=dst.u.f.msize) {
                        H5T__bit_copy(d, dst.u.f.mpos,
                                     s, (mpos+msize+mrsh-dst.u.f.msize),
                                     dst.u.f.msize-mrsh);
                    }
                    else {
                        H5T__bit_copy(d, dst.u.f.mpos+dst.u.f.msize-(mrsh+msize),
                                     s, mpos, msize);
                        H5T__bit_set(d, dst.u.f.mpos, dst.u.f.msize-(mrsh+msize),
                                    FALSE);
                    }
                }

                /* Write the exponent */
                if (carry) {
                    expo++;
                    if (expo>=expo_max) {
                        /*
                         * The exponent is too large to fit in the available
                         * region or it results in the maximum possible value.
                         * Use positive or negative infinity instead unless the
                         * application specifies something else.  Before
                         * calling the overflow handler make sure the source
                         * buffer we hand it is in the original byte order.
                         */
                        if(cb_struct.func) { /*If user's exception handler is present, use it*/
                            /*reverse order first*/
                            H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                            except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI, src_id, dst_id,
                                    src_rev, d, cb_struct.user_data);
                        }

                        if(except_ret == H5T_CONV_UNHANDLED) {
                            expo = expo_max;
                            H5T__bit_set(d, dst.u.f.mpos, dst.u.f.msize, FALSE);
                        }
                        else if(except_ret == H5T_CONV_ABORT)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                        else if(except_ret == H5T_CONV_HANDLED) {
                            reverse = FALSE;
                            goto next;
                        }
                    }
                }
                /*reset CARRY*/
                carry = FALSE;

                H5_CHECK_OVERFLOW(expo,hssize_t,hsize_t);
                H5T__bit_set_d(d, dst.u.f.epos, dst.u.f.esize, (hsize_t)expo);

            padding:

                /*
                 * Set external padding areas
                 */
                if (dst.offset>0) {
                    HDassert(H5T_PAD_ZERO==dst.lsb_pad || H5T_PAD_ONE==dst.lsb_pad);
                    H5T__bit_set (d, (size_t)0, dst.offset, (hbool_t)(H5T_PAD_ONE==dst.lsb_pad));
                }
                if (dst.offset+dst.prec!=8*dst_p->shared->size) {
                    HDassert(H5T_PAD_ZERO==dst.msb_pad || H5T_PAD_ONE==dst.msb_pad);
                    H5T__bit_set (d, dst.offset+dst.prec, 8*dst_p->shared->size - (dst.offset+dst.prec),
                         (hbool_t)(H5T_PAD_ONE==dst.msb_pad));
                }

                /*
                 * Put the destination in the correct byte order.  See note at
                 * beginning of loop.
                 */
                if (H5T_ORDER_BE==dst.order && reverse) {
                    half_size = dst_p->shared->size/2;
                    for (i=0; i<half_size; i++) {
                        uint8_t tmp = d[dst_p->shared->size-(i+1)];
                        d[dst_p->shared->size-(i+1)] = d[i];
                        d[i] = tmp;
                    }
                } else if (H5T_ORDER_VAX==dst.order && reverse) {
                    tsize = dst_p->shared->size;
                    HDassert(0 == tsize % 2);

                    for (i = 0; i < tsize; i += 4) {
                        tmp1 = d[i];
                        tmp2 = d[i+1];

                        d[i] = d[(tsize-2)-i];
                        d[i+1] = d[(tsize-1)-i];

                        d[(tsize-2)-i] = tmp1;
                        d[(tsize-1)-i] = tmp2;
                    }
                }

                /*
                 * If we had used a temporary buffer for the destination then we
                 * should copy the value to the true destination buffer.
                 */
            next:
                if(d == dbuf)
                    H5MM_memcpy(dp, d, dst_p->shared->size);

                /* Advance source & destination pointers by delta amounts */
                sp += src_delta;
                dp += dst_delta;
            }

            break;

        default:
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    } /* end switch */

done:
    if(src_rev)
        H5MM_free(src_rev);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_f_f() */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_s_s
 *
 * Purpose:	Convert one fixed-length string type to another.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Friday, August	7, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_s_s(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
    size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride, void *buf,
    void H5_ATTR_UNUSED *bkg)
{
    H5T_t	*src=NULL;		/*source datatype		*/
    H5T_t	*dst=NULL;		/*destination datatype		*/
    ssize_t	src_delta, dst_delta;	/*source & destination stride	*/
    int	        direction;		/*direction of traversal	*/
    size_t	elmtno;			/*element number		*/
    size_t	olap;			/*num overlapping elements	*/
    size_t	nchars=0;		/*number of characters copied	*/
    uint8_t	*s, *sp, *d, *dp;	/*src and dst traversal pointers*/
    uint8_t	*dbuf=NULL;		/*temp buf for overlap convers.	*/
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
            if(8 * src->shared->size != src->shared->u.atomic.prec || 8 * dst->shared->size != dst->shared->u.atomic.prec)
                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "bad precision")
            if(0 != src->shared->u.atomic.offset || 0 != dst->shared->u.atomic.offset)
                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "bad offset")
            if(H5T_CSET_ASCII != src->shared->u.atomic.u.s.cset && H5T_CSET_UTF8 != src->shared->u.atomic.u.s.cset)
                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "bad source character set")
            if(H5T_CSET_ASCII != dst->shared->u.atomic.u.s.cset && H5T_CSET_UTF8 != dst->shared->u.atomic.u.s.cset)
                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "bad destination character set")
            if((H5T_CSET_ASCII == src->shared->u.atomic.u.s.cset && H5T_CSET_UTF8 == dst->shared->u.atomic.u.s.cset) 
                    || (H5T_CSET_ASCII == dst->shared->u.atomic.u.s.cset && H5T_CSET_UTF8 == src->shared->u.atomic.u.s.cset))
                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "The library doesn't convert between strings of ASCII and UTF")
            if(src->shared->u.atomic.u.s.pad < 0 || src->shared->u.atomic.u.s.pad >= H5T_NSTR ||
                    dst->shared->u.atomic.u.s.pad < 0 || dst->shared->u.atomic.u.s.pad >= H5T_NSTR)
                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "bad character padding")
            cdata->need_bkg = H5T_BKG_NO;
            break;

        case H5T_CONV_FREE:
            break;

        case H5T_CONV_CONV:
            /* Get the datatypes */
            if(NULL == (src = (H5T_t *)H5I_object(src_id)) || NULL == (dst = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")

            /*
             * Do we process the values from beginning to end or vice versa? Also,
             * how many of the elements have the source and destination areas
             * overlapping?
             */
            if (src->shared->size==dst->shared->size || buf_stride) {
                /*
                 * When the source and destination are the same size we can do
                 * all the conversions in place.
                 */
                sp = dp = (uint8_t*)buf;
                direction = 1;
                olap = 0;
            } else if (src->shared->size>=dst->shared->size) {
                double olapd = HDceil((double)(dst->shared->size)/
                          (double)(src->shared->size-dst->shared->size));
                olap = (size_t)olapd;
                sp = dp = (uint8_t*)buf;
                direction = 1;
            } else {
                double olapd = HDceil((double)(src->shared->size)/
                          (double)(dst->shared->size-src->shared->size));
                olap = (size_t)olapd;
                sp = (uint8_t*)buf + (nelmts-1) * src->shared->size;
                dp = (uint8_t*)buf + (nelmts-1) * dst->shared->size;
                direction = -1;
            }

            /*
             * Direction & size of buffer traversal.
             */
            H5_CHECK_OVERFLOW(buf_stride, size_t, ssize_t);
            H5_CHECK_OVERFLOW(src->shared->size, size_t, ssize_t);
            H5_CHECK_OVERFLOW(dst->shared->size, size_t, ssize_t);
            src_delta = (ssize_t)direction * (ssize_t)(buf_stride ? buf_stride : src->shared->size);
            dst_delta = (ssize_t)direction * (ssize_t)(buf_stride ? buf_stride : dst->shared->size);

            /* Allocate the overlap buffer */
            if(NULL == (dbuf = (uint8_t *)H5MM_malloc(dst->shared->size)))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for string conversion")

            /* The conversion loop. */
            for(elmtno = 0; elmtno < nelmts; elmtno++) {

                /*
                 * If the source and destination buffers overlap then use a
                 * temporary buffer for the destination.
                 */
                if(direction > 0) {
                    s = sp;
                    d = elmtno < olap ? dbuf : dp;
                } else {
                    s = sp;
                    d = elmtno + olap >= nelmts ? dbuf : dp;
                }
#ifndef NDEBUG
                /* I don't quite trust the overlap calculations yet --rpm */
                if (src->shared->size==dst->shared->size || buf_stride) {
                    HDassert(s==d);
                } else if (d==dbuf) {
                    HDassert((dp>=sp && dp<sp+src->shared->size) ||
                       (sp>=dp && sp<dp+dst->shared->size));
                } else {
                    HDassert((dp<sp && dp+dst->shared->size<=sp) ||
                       (sp<dp && sp+src->shared->size<=dp));
                }
#endif

                /* Copy characters from source to destination */
                switch(src->shared->u.atomic.u.s.pad) {
                    case H5T_STR_NULLTERM:
                        for (nchars=0;
                             nchars<dst->shared->size && nchars<src->shared->size && s[nchars];
                             nchars++) {
                            d[nchars] = s[nchars];
                        }
                        break;

                    case H5T_STR_NULLPAD:
                        for (nchars=0;
                             nchars<dst->shared->size && nchars<src->shared->size && s[nchars];
                             nchars++) {
                            d[nchars] = s[nchars];
                        }
                        break;

                    case H5T_STR_SPACEPAD:
                        nchars = src->shared->size;
                        while (nchars>0 && ' '==s[nchars-1])
                            --nchars;
                        nchars = MIN(dst->shared->size, nchars);
                        if(d != s)
                            H5MM_memcpy(d, s, nchars);
                        break;

                    case H5T_STR_RESERVED_3:
                    case H5T_STR_RESERVED_4:
                    case H5T_STR_RESERVED_5:
                    case H5T_STR_RESERVED_6:
                    case H5T_STR_RESERVED_7:
                    case H5T_STR_RESERVED_8:
                    case H5T_STR_RESERVED_9:
                    case H5T_STR_RESERVED_10:
                    case H5T_STR_RESERVED_11:
                    case H5T_STR_RESERVED_12:
                    case H5T_STR_RESERVED_13:
                    case H5T_STR_RESERVED_14:
                    case H5T_STR_RESERVED_15:
                    case H5T_STR_ERROR:
                    default:
                        HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "source string padding method not supported")
                } /* end switch */

                /* Terminate or pad the destination */
                switch(dst->shared->u.atomic.u.s.pad) {
                    case H5T_STR_NULLTERM:
                        while(nchars < dst->shared->size)
                            d[nchars++] = '\0';
                        d[dst->shared->size - 1] = '\0';
                        break;

                    case H5T_STR_NULLPAD:
                        while(nchars < dst->shared->size)
                            d[nchars++] = '\0';
                        break;

                    case H5T_STR_SPACEPAD:
                        while(nchars < dst->shared->size)
                            d[nchars++] = ' ';
                        break;

                    case H5T_STR_RESERVED_3:
                    case H5T_STR_RESERVED_4:
                    case H5T_STR_RESERVED_5:
                    case H5T_STR_RESERVED_6:
                    case H5T_STR_RESERVED_7:
                    case H5T_STR_RESERVED_8:
                    case H5T_STR_RESERVED_9:
                    case H5T_STR_RESERVED_10:
                    case H5T_STR_RESERVED_11:
                    case H5T_STR_RESERVED_12:
                    case H5T_STR_RESERVED_13:
                    case H5T_STR_RESERVED_14:
                    case H5T_STR_RESERVED_15:
                    case H5T_STR_ERROR:
                    default:
                        HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "destination string padding method not supported")
                } /* end switch */

                /*
                 * If we used a temporary buffer for the destination then we
                 * should copy the value to the true destination buffer.
                 */
                if(d == dbuf)
                    H5MM_memcpy(dp, d, dst->shared->size);

                /* Advance source & destination pointers by delta amounts */
                sp += src_delta;
                dp += dst_delta;
            } /* end for */
            break;

        default:
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown converson command")
    } /* end switch */

done:
    H5MM_xfree(dbuf);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_s_s() */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_schar_uchar
 *
 * Purpose:	Converts `signed char' to `unsigned char'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Monday, November 16, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_schar_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_su(SCHAR, UCHAR, signed char, unsigned char, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uchar_schar
 *
 * Purpose:	Converts `unsigned char' to `signed char'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Monday, November 16, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uchar_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_us(UCHAR, SCHAR, unsigned char, signed char, -, SCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_schar_short
 *
 * Purpose:	Converts `signed char' to `short'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_schar_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sS(SCHAR, SHORT, signed char, short, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_schar_ushort
 *
 * Purpose:	Converts `signed char' to `unsigned short'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_schar_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sU(SCHAR, USHORT, signed char, unsigned short, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uchar_short
 *
 * Purpose:	Converts `unsigned char' to `short'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uchar_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uS(UCHAR, SHORT, unsigned char, short, -, SHRT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uchar_ushort
 *
 * Purpose:	Converts `unsigned char' to `unsigned short'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uchar_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uU(UCHAR, USHORT, unsigned char, unsigned short, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_schar_int
 *
 * Purpose:	Converts `signed char' to `int'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_schar_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sS(SCHAR, INT, signed char, int, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_schar_uint
 *
 * Purpose:	Converts `signed char' to `unsigned int'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_schar_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sU(SCHAR, UINT, signed char, unsigned, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uchar_int
 *
 * Purpose:	Converts `unsigned char' to `int'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uchar_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uS(UCHAR, INT, unsigned char, int, -, INT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uchar_uint
 *
 * Purpose:	Converts `unsigned char' to `unsigned int'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uchar_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uU(UCHAR, UINT, unsigned char, unsigned, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_schar_long
 *
 * Purpose:	Converts `signed char' to `long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_schar_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sS(SCHAR, LONG, signed char, long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_schar_ulong
 *
 * Purpose:	Converts `signed char' to `unsigned long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_schar_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sU(SCHAR, ULONG, signed char, unsigned long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uchar_long
 *
 * Purpose:	Converts `unsigned char' to `long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uchar_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uS(UCHAR, LONG, unsigned char, long, -, LONG_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uchar_ulong
 *
 * Purpose:	Converts `unsigned char' to `unsigned long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uchar_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uU(UCHAR, ULONG, unsigned char, unsigned long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_schar_llong
 *
 * Purpose:	Converts `signed char' to `long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_schar_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sS(SCHAR, LLONG, signed char, long long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_schar_ullong
 *
 * Purpose:	Converts `signed char' to `unsigned long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_schar_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sU(SCHAR, ULLONG, signed char, unsigned long long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uchar_llong
 *
 * Purpose:	Converts `unsigned char' to `long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uchar_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uS(UCHAR, LLONG, unsigned char, long long, -, LLONG_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uchar_ullong
 *
 * Purpose:	Converts `unsigned char' to `unsigned long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uchar_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uU(UCHAR, ULLONG, unsigned char, unsigned long long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_short_schar
 *
 * Purpose:	Converts `short' to `signed char'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_short_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Ss(SHORT, SCHAR, short, signed char, SCHAR_MIN, SCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_short_uchar
 *
 * Purpose:	Converts `short' to `unsigned char'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_short_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Su(SHORT, UCHAR, short, unsigned char, -, UCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ushort_schar
 *
 * Purpose:	Converts `unsigned short' to `signed char'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ushort_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Us(USHORT, SCHAR, unsigned short, signed char, -, SCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ushort_uchar
 *
 * Purpose:	Converts `unsigned short' to `unsigned char'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ushort_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Uu(USHORT, UCHAR, unsigned short, unsigned char, -, UCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_short_ushort
 *
 * Purpose:	Converts `short' to `unsigned short'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Monday, November 16, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_short_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_su(SHORT, USHORT, short, unsigned short, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ushort_short
 *
 * Purpose:	Converts `unsigned short' to `short'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Monday, November 16, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ushort_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_us(USHORT, SHORT, unsigned short, short, -, SHRT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_short_int
 *
 * Purpose:	Converts `short' to `int'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_short_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sS(SHORT, INT, short, int, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_short_uint
 *
 * Purpose:	Converts `short' to `unsigned int'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_short_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sU(SHORT, UINT, short, unsigned, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ushort_int
 *
 * Purpose:	Converts `unsigned short' to `int'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ushort_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uS(USHORT, INT, unsigned short, int, -, INT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ushort_uint
 *
 * Purpose:	Converts `unsigned short' to `unsigned int'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ushort_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uU(USHORT, UINT, unsigned short, unsigned, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_short_long
 *
 * Purpose:	Converts `short' to `long'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_short_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sS(SHORT, LONG, short, long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_short_ulong
 *
 * Purpose:	Converts `short' to `unsigned long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_short_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sU(SHORT, ULONG, short, unsigned long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ushort_long
 *
 * Purpose:	Converts `unsigned short' to `long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ushort_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uS(USHORT, LONG, unsigned short, long, -, LONG_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ushort_ulong
 *
 * Purpose:	Converts `unsigned short' to `unsigned long'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ushort_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uU(USHORT, ULONG, unsigned short, unsigned long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_short_llong
 *
 * Purpose:	Converts `short' to `long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_short_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sS(SHORT, LLONG, short, long long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_short_ullong
 *
 * Purpose:	Converts `short' to `unsigned long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_short_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sU(SHORT, ULLONG, short, unsigned long long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ushort_llong
 *
 * Purpose:	Converts `unsigned short' to `long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ushort_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uS(USHORT, LLONG, unsigned short, long long, -, LLONG_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ushort_ullong
 *
 * Purpose:	Converts `unsigned short' to `unsigned long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ushort_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uU(USHORT, ULLONG, unsigned short, unsigned long long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_int_schar
 *
 * Purpose:	Converts `int' to `signed char'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_int_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Ss(INT, SCHAR, int, signed char, SCHAR_MIN, SCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_int_uchar
 *
 * Purpose:	Converts `int' to `unsigned char'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_int_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Su(INT, UCHAR, int, unsigned char, -, UCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uint_schar
 *
 * Purpose:	Converts `unsigned int' to `signed char'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uint_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Us(UINT, SCHAR, unsigned, signed char, -, SCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uint_uchar
 *
 * Purpose:	Converts `unsigned int' to `unsigned char'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uint_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Uu(UINT, UCHAR, unsigned, unsigned char, -, UCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_int_short
 *
 * Purpose:	Converts `int' to `short'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_int_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Ss(INT, SHORT, int, short, SHRT_MIN, SHRT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_int_ushort
 *
 * Purpose:	Converts `int' to `unsigned short'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_int_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Su(INT, USHORT, int, unsigned short, -, USHRT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uint_short
 *
 * Purpose:	Converts `unsigned int' to `short'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uint_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Us(UINT, SHORT, unsigned, short, -, SHRT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uint_ushort
 *
 * Purpose:	Converts `unsigned int' to `unsigned short'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uint_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Uu(UINT, USHORT, unsigned, unsigned short, -, USHRT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_int_uint
 *
 * Purpose:	Converts `int' to `unsigned int'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Monday, November 16, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_int_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_su(INT, UINT, int, unsigned, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uint_int
 *
 * Purpose:	Converts `unsigned int' to `int'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Monday, November 16, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uint_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_us(UINT, INT, unsigned, int, -, INT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_int_long
 *
 * Purpose:	Converts `int' to `long'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_int_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sS(INT, LONG, int, long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_int_ulong
 *
 * Purpose:	Converts `int' to `unsigned long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_int_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sU(INT, LONG, int, unsigned long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uint_long
 *
 * Purpose:	Converts `unsigned int' to `long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uint_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uS(UINT, LONG, unsigned, long, -, LONG_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uint_ulong
 *
 * Purpose:	Converts `unsigned int' to `unsigned long'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uint_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uU(UINT, ULONG, unsigned, unsigned long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_int_llong
 *
 * Purpose:	Converts `int' to `long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_int_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sS(INT, LLONG, int, long long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_int_ullong
 *
 * Purpose:	Converts `int' to `unsigned long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_int_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sU(INT, ULLONG, int, unsigned long long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uint_llong
 *
 * Purpose:	Converts `unsigned int' to `long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uint_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uS(UINT, LLONG, unsigned, long long, -, LLONG_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uint_ullong
 *
 * Purpose:	Converts `unsigned int' to `unsigned long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uint_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uU(UINT, ULLONG, unsigned, unsigned long long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_long_schar
 *
 * Purpose:	Converts `long' to `signed char'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_long_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Ss(LONG, SCHAR, long, signed char, SCHAR_MIN, SCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_long_uchar
 *
 * Purpose:	Converts `long' to `unsigned char'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_long_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Su(LONG, UCHAR, long, unsigned char, -, UCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ulong_schar
 *
 * Purpose:	Converts `unsigned long' to `signed char'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ulong_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Us(ULONG, SCHAR, unsigned long, signed char, -, SCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ulong_uchar
 *
 * Purpose:	Converts `unsigned long' to `unsigned char'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ulong_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Uu(ULONG, UCHAR, unsigned long, unsigned char, -, UCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_long_short
 *
 * Purpose:	Converts `long' to `short'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_long_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Ss(LONG, SHORT, long, short, SHRT_MIN, SHRT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_long_ushort
 *
 * Purpose:	Converts `long' to `unsigned short'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_long_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Su(LONG, USHORT, long, unsigned short, -, USHRT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ulong_short
 *
 * Purpose:	Converts `unsigned long' to `short'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ulong_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Us(ULONG, SHORT, unsigned long, short, -, SHRT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ulong_ushort
 *
 * Purpose:	Converts `unsigned long' to `unsigned short'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ulong_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Uu(ULONG, USHORT, unsigned long, unsigned short, -, USHRT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_long_int
 *
 * Purpose:	Converts `long' to `int'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_long_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Ss(LONG, INT, long, int, INT_MIN, INT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_long_uint
 *
 * Purpose:	Converts `long' to `unsigned int'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_long_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Su(LONG, UINT, long, unsigned, -, UINT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ulong_int
 *
 * Purpose:	Converts `unsigned long' to `int'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ulong_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Us(ULONG, INT, unsigned long, int, -, INT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ulong_uint
 *
 * Purpose:	Converts `unsigned long' to `unsigned int'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ulong_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Uu(ULONG, UINT, unsigned long, unsigned, -, UINT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_long_ulong
 *
 * Purpose:	Converts `long' to `unsigned long'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Monday, November 16, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_long_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_su(LONG, ULONG, long, unsigned long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ulong_long
 *
 * Purpose:	Converts `unsigned long' to `long'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Monday, November 16, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ulong_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_us(ULONG, LONG, unsigned long, long, -, LONG_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_long_llong
 *
 * Purpose:	Converts `long' to `long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_long_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sS(LONG, LLONG, long, long long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_long_ullong
 *
 * Purpose:	Converts `long' to `unsigned long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_long_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_sU(LONG, ULLONG, long, unsigned long long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ulong_llong
 *
 * Purpose:	Converts `unsigned long' to `long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ulong_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uS(ULONG, LLONG, unsigned long, long long, -, LLONG_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ulong_ullong
 *
 * Purpose:	Converts `unsigned long' to `unsigned long long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ulong_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_uU(ULONG, ULLONG, unsigned long, unsigned long long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_llong_schar
 *
 * Purpose:	Converts `long long' to `signed char'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_llong_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Ss(LLONG, SCHAR, long long, signed char, SCHAR_MIN, SCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_llong_uchar
 *
 * Purpose:	Converts `long long' to `unsigned char'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_llong_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Su(LLONG, UCHAR, long long, unsigned char, -, UCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ullong_schar
 *
 * Purpose:	Converts `unsigned long long' to `signed char'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ullong_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Us(ULLONG, SCHAR, unsigned long long, signed char, -, SCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ullong_uchar
 *
 * Purpose:	Converts `unsigned long long' to `unsigned char'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ullong_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Uu(ULLONG, UCHAR, unsigned long long, unsigned char, -, UCHAR_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_llong_short
 *
 * Purpose:	Converts `long long' to `short'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_llong_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Ss(LLONG, SHORT, long long, short, SHRT_MIN, SHRT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_llong_ushort
 *
 * Purpose:	Converts `long long' to `unsigned short'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_llong_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Su(LLONG, USHORT, long long, unsigned short, -, USHRT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ullong_short
 *
 * Purpose:	Converts `unsigned long long' to `short'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ullong_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Us(ULLONG, SHORT, unsigned long long, short, -, SHRT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ullong_ushort
 *
 * Purpose:	Converts `unsigned long long' to `unsigned short'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ullong_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Uu(ULLONG, USHORT, unsigned long long, unsigned short, -, USHRT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_llong_int
 *
 * Purpose:	Converts `long long' to `int'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_llong_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Ss(LLONG, INT, long long, int, INT_MIN, INT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_llong_uint
 *
 * Purpose:	Converts `long long' to `unsigned int'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_llong_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Su(LLONG, UINT, long long, unsigned, -, UINT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ullong_int
 *
 * Purpose:	Converts `unsigned long long' to `int'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ullong_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Us(ULLONG, INT, unsigned long long, int, -, INT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ullong_uint
 *
 * Purpose:	Converts `unsigned long long' to `unsigned int'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ullong_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Uu(ULLONG, UINT, unsigned long long, unsigned, -, UINT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_llong_long
 *
 * Purpose:	Converts `long long' to `long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_llong_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Ss(LLONG, LONG, long long, long, LONG_MIN, LONG_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_llong_ulong
 *
 * Purpose:	Converts `long long' to `unsigned long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_llong_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Su(LLONG, ULONG, long long, unsigned long, -, ULONG_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ullong_long
 *
 * Purpose:	Converts `unsigned long long' to `long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ullong_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Us(ULLONG, LONG, unsigned long long, long, -, LONG_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ullong_ulong
 *
 * Purpose:	Converts `unsigned long long' to `unsigned long'
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Friday, November 13, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ullong_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Uu(ULLONG, ULONG, unsigned long long, unsigned long, -, ULONG_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_llong_ullong
 *
 * Purpose:	Converts `long long' to `unsigned long long'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Monday, November 16, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_llong_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_su(LLONG, ULLONG, long long, unsigned long long, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ullong_llong
 *
 * Purpose:	Converts `unsigned long long' to `long long'
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *		Monday, November 16, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ullong_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_us(ULLONG, LLONG, unsigned long long, long long, -, LLONG_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_float_double
 *
 * Purpose:	Convert native `float' to native `double' using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Tuesday, June 23, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_float_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_fF(FLOAT, DOUBLE, float, double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_float_ldouble
 *
 * Purpose:	Convert native `float' to native `long double' using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, Feb 25, 2005
 *
 *-------------------------------------------------------------------------
 */
#if H5_SIZEOF_LONG_DOUBLE != 0
herr_t
H5T__conv_float_ldouble (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_fF(FLOAT, LDOUBLE, float, long double, -, -);
}
#endif /* H5_SIZEOF_LONG_DOUBLE != 0 */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_double_float
 *
 * Purpose:	Convert native `double' to native `float' using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Tuesday, June 23, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_double_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Ff(DOUBLE, FLOAT, double, float, -FLT_MAX, FLT_MAX);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_double_ldouble
 *
 * Purpose:	Convert native `double' to native `long double' using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, Feb 25, 2005
 *
 *-------------------------------------------------------------------------
 */
#if H5_SIZEOF_LONG_DOUBLE != 0
herr_t
H5T__conv_double_ldouble (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_fF(DOUBLE, LDOUBLE, double, long double, -, -);
}
#endif /* H5_SIZEOF_LONG_DOUBLE != 0 */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ldouble_float
 *
 * Purpose:	Convert native `long double' to native `float' using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, Feb 25, 2005
 *
 *-------------------------------------------------------------------------
 */
#if H5_SIZEOF_LONG_DOUBLE != 0
herr_t
H5T__conv_ldouble_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Ff(LDOUBLE, FLOAT, long double, float, -FLT_MAX, FLT_MAX);
}
#endif /* H5_SIZEOF_LONG_DOUBLE != 0 */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ldouble_double
 *
 * Purpose:	Convert native `long double' to native `double' using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, Feb 25, 2005
 *
 *-------------------------------------------------------------------------
 */
#if H5_SIZEOF_LONG_DOUBLE != 0
herr_t
H5T__conv_ldouble_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_Ff(LDOUBLE, DOUBLE, long double, double, -DBL_MAX, DBL_MAX);
}
#endif /* H5_SIZEOF_LONG_DOUBLE != 0 */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_schar_float
 *
 * Purpose:	Convert native signed char to native float using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_schar_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(SCHAR, FLOAT, signed char, float, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_schar_double
 *
 * Purpose:	Convert native signed char to native double using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_schar_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(SCHAR, DOUBLE, signed char, double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_schar_ldouble
 *
 * Purpose:	Convert native signed char to native long double using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_schar_ldouble (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(SCHAR, LDOUBLE, signed char, long double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uchar_float
 *
 * Purpose:	Convert native unsigned char to native float using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uchar_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(UCHAR, FLOAT, unsigned char, float, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uchar_double
 *
 * Purpose:	Convert native unsigned char to native double using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uchar_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(UCHAR, DOUBLE, unsigned char, double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uchar_ldouble
 *
 * Purpose:	Convert native unsigned char to native long double using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uchar_ldouble (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(UCHAR, LDOUBLE, unsigned char, long double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_short_float
 *
 * Purpose:	Convert native short to native float using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_short_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(SHORT, FLOAT, short, float, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_short_double
 *
 * Purpose:	Convert native short to native double using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_short_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(SHORT, DOUBLE, short, double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_short_ldouble
 *
 * Purpose:	Convert native short to native long double using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_short_ldouble (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(SHORT, LDOUBLE, short, long double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ushort_float
 *
 * Purpose:	Convert native unsigned short to native float using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ushort_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(USHORT, FLOAT, unsigned short, float, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ushort_double
 *
 * Purpose:	Convert native unsigned short to native double using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ushort_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(USHORT, DOUBLE, unsigned short, double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ushort_ldouble
 *
 * Purpose:	Convert native unsigned short to native long double using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ushort_ldouble (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(USHORT, LDOUBLE, unsigned short, long double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_int_float
 *
 * Purpose:	Convert native integer to native float using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_int_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(INT, FLOAT, int, float, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_int_double
 *
 * Purpose:	Convert native integer to native double using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_int_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(INT, DOUBLE, int, double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_int_ldouble
 *
 * Purpose:	Convert native integer to native long double using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_int_ldouble (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(INT, LDOUBLE, int, long double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uint_float
 *
 * Purpose:	Convert native unsigned integer to native float using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uint_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(UINT, FLOAT, unsigned int, float, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uint_double
 *
 * Purpose:	Convert native unsigned integer to native double using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uint_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(UINT, DOUBLE, unsigned int, double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_uint_ldouble
 *
 * Purpose:	Convert native unsigned integer to native long double using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_uint_ldouble (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(UINT, LDOUBLE, unsigned int, long double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_long_float
 *
 * Purpose:	Convert native long to native float using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_long_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(LONG, FLOAT, long, float, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_long_double
 *
 * Purpose:	Convert native long to native double using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_long_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(LONG, DOUBLE, long, double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_long_ldouble
 *
 * Purpose:	Convert native long to native long double using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_long_ldouble (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(LONG, LDOUBLE, long, long double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ulong_float
 *
 * Purpose:	Convert native unsigned long to native float using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ulong_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(ULONG, FLOAT, unsigned long, float, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ulong_double
 *
 * Purpose:	Convert native unsigned long to native double using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ulong_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(ULONG, DOUBLE, unsigned long, double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ulong_ldouble
 *
 * Purpose:	Convert native unsigned long to native long double using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ulong_ldouble (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(ULONG, LDOUBLE, unsigned long, long double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_llong_float
 *
 * Purpose:	Convert native long long to native float using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_llong_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(LLONG, FLOAT, long long, float, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_llong_double
 *
 * Purpose:	Convert native long long to native double using hardware.
 *		This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_llong_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(LLONG, DOUBLE, long long, double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_llong_ldouble
 *
 * Purpose:	Convert native long long to native long double using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
#ifdef H5T_CONV_INTERNAL_LLONG_LDOUBLE
herr_t
H5T__conv_llong_ldouble (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(LLONG, LDOUBLE, long long, long double, -, -);
}
#endif /* H5T_CONV_INTERNAL_LLONG_LDOUBLE */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ullong_float
 *
 * Purpose:	Convert native unsigned long long to native float using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ullong_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(ULLONG, FLOAT, unsigned long long, float, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ullong_double
 *
 * Purpose:	Convert native unsigned long long to native double using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ullong_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(ULLONG, DOUBLE, unsigned long long, double, -, -);
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ullong_ldouble
 *
 * Purpose:	Convert native unsigned long long to native long double using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
#ifdef H5T_CONV_INTERNAL_ULLONG_LDOUBLE
herr_t
H5T__conv_ullong_ldouble (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
    H5T_CONV_xF(ULLONG, LDOUBLE, unsigned long long, long double, -, -);
}
#endif /*H5T_CONV_INTERNAL_ULLONG_LDOUBLE*/


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_float_schar
 *
 * Purpose:	Convert native float to native signed char using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_float_schar (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(FLOAT, SCHAR, float, signed char, SCHAR_MIN, SCHAR_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_float_uchar
 *
 * Purpose:	Convert native float to native unsigned char using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_float_uchar (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(FLOAT, UCHAR, float, unsigned char, 0, UCHAR_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_double_schar
 *
 * Purpose:	Convert native double to native signed char using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_double_schar (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(DOUBLE, SCHAR, double, signed char, SCHAR_MIN, SCHAR_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_double_uchar
 *
 * Purpose:	Convert native double to native unsigned char using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_double_uchar (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(DOUBLE, UCHAR, double, unsigned char, 0, UCHAR_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ldouble_schar
 *
 * Purpose:	Convert native long double to native signed char using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ldouble_schar (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(LDOUBLE, SCHAR, long double, signed char, SCHAR_MIN, SCHAR_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ldouble_uchar
 *
 * Purpose:	Convert native long double to native unsigned char using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ldouble_uchar (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(LDOUBLE, UCHAR, long double, unsigned char, 0, UCHAR_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_float_short
 *
 * Purpose:	Convert native float to native short using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_float_short (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(FLOAT, SHORT, float, short, SHRT_MIN, SHRT_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_float_ushort
 *
 * Purpose:	Convert native float to native unsigned short using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_float_ushort (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(FLOAT, USHORT, float, unsigned short, 0, USHRT_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_double_short
 *
 * Purpose:	Convert native double to native short using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_double_short (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(DOUBLE, SHORT, double, short, SHRT_MIN, SHRT_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_double_ushort
 *
 * Purpose:	Convert native double to native unsigned short using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_double_ushort (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(DOUBLE, USHORT, double, unsigned short, 0, USHRT_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ldouble_short
 *
 * Purpose:	Convert native long double to native short using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ldouble_short (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(LDOUBLE, SHORT, long double, short, SHRT_MIN, SHRT_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ldouble_ushort
 *
 * Purpose:	Convert native long double to native unsigned short using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ldouble_ushort (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(LDOUBLE, USHORT, long double, unsigned short, 0, USHRT_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_float_int
 *
 * Purpose:	Convert native float to native int using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_float_int (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(FLOAT, INT, float, int, INT_MIN, INT_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_float_uint
 *
 * Purpose:	Convert native float to native unsigned int using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_float_uint (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(FLOAT, UINT, float, unsigned int, 0, UINT_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_double_int
 *
 * Purpose:	Convert native double to native int using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_double_int (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(DOUBLE, INT, double, int, INT_MIN, INT_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_double_uint
 *
 * Purpose:	Convert native double to native unsigned int using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_double_uint (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(DOUBLE, UINT, double, unsigned int, 0, UINT_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ldouble_int
 *
 * Purpose:	Convert native long double to native int using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ldouble_int (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(LDOUBLE, INT, long double, int, INT_MIN, INT_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ldouble_uint
 *
 * Purpose:	Convert native long double to native unsigned int using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ldouble_uint (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(LDOUBLE, UINT, long double, unsigned int, 0, UINT_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_float_long
 *
 * Purpose:	Convert native float to native long using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_float_long (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(FLOAT, LONG, float, long, LONG_MIN, LONG_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_float_ulong
 *
 * Purpose:	Convert native float to native unsigned long using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_float_ulong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(FLOAT, ULONG, float, unsigned long, 0, ULONG_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_double_long
 *
 * Purpose:	Convert native double to native long using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_double_long (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(DOUBLE, LONG, double, long, LONG_MIN, LONG_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_double_ulong
 *
 * Purpose:	Convert native double to native unsigned long using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_double_ulong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(DOUBLE, ULONG, double, unsigned long, 0, ULONG_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ldouble_long
 *
 * Purpose:	Convert native long double to native long using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ldouble_long (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(LDOUBLE, LONG, long double, long, LONG_MIN, LONG_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ldouble_ulong
 *
 * Purpose:	Convert native long double to native unsigned long using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_ldouble_ulong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(LDOUBLE, ULONG, long double, unsigned long, 0, ULONG_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_float_llong
 *
 * Purpose:	Convert native float to native long long using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_float_llong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(FLOAT, LLONG, float, long long, LLONG_MIN, LLONG_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_float_ullong
 *
 * Purpose:	Convert native float to native unsigned long long using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_float_ullong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(FLOAT, ULLONG, float, unsigned long long, 0, ULLONG_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_double_llong
 *
 * Purpose:	Convert native double to native long long using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_double_llong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(DOUBLE, LLONG, double, long long, LLONG_MIN, LLONG_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_double_ullong
 *
 * Purpose:	Convert native double to native unsigned long long using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, November 7, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_double_ullong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(DOUBLE, ULLONG, double, unsigned long long, 0, ULLONG_MAX);
H5_GCC_DIAG_ON(float-equal)
}


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ldouble_llong
 *
 * Purpose:	Convert native long double to native long long using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
#ifdef H5T_CONV_INTERNAL_LDOUBLE_LLONG
herr_t
H5T__conv_ldouble_llong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(LDOUBLE, LLONG, long double, long long, LLONG_MIN, LLONG_MAX);
H5_GCC_DIAG_ON(float-equal)
}
#endif /*H5T_CONV_INTERNAL_LDOUBLE_LLONG*/


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_ldouble_ullong
 *
 * Purpose:	Convert native long double to native unsigned long long using
 *              hardware.  This is a fast special case.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Tuesday, Febuary 1, 2005
 *
 *-------------------------------------------------------------------------
 */
#if H5T_CONV_INTERNAL_LDOUBLE_ULLONG
herr_t
H5T__conv_ldouble_ullong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
    size_t nelmts, size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride,
    void *buf, void H5_ATTR_UNUSED *bkg)
{
H5_GCC_DIAG_OFF(float-equal)
    H5T_CONV_Fx(LDOUBLE, ULLONG, long double, unsigned long long, 0, ULLONG_MAX);
H5_GCC_DIAG_ON(float-equal)
}
#endif /*H5T_CONV_INTERNAL_LDOUBLE_ULLONG*/


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_f_i
 *
 * Purpose:	Convert one floating-point type to an integer.  This is
 *              the catch-all function for float-integer conversions and
 *              is probably not particularly fast.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Wednesday, Jan 21, 2004
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_f_i(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
    size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride, void *buf, void H5_ATTR_UNUSED *bkg)
{
    /* Traversal-related variables */
    H5T_t	*src_p;			/*source datatype		*/
    H5T_t	*dst_p;			/*destination datatype		*/
    H5T_atomic_t src;			/*atomic source info		*/
    H5T_atomic_t dst;			/*atomic destination info	*/
    int	direction;		        /*forward or backward traversal	*/
    size_t	elmtno;			/*element number		*/
    size_t	half_size;		/*half the type size		*/
    size_t      tsize;                  /*type size for swapping bytes  */
    size_t	olap;			/*num overlapping elements	*/
    uint8_t	*s, *sp, *d, *dp;	/*source and dest traversal ptrs*/
    uint8_t     *src_rev=NULL;          /*order-reversed source buffer  */
    uint8_t	dbuf[64];		/*temp destination buffer	*/
    uint8_t     tmp1, tmp2;             /*temp variables for swapping bytes*/

    /* Conversion-related variables */
    hssize_t	expo;			/*source exponent		*/
    hssize_t    sign;                   /*source sign bit value         */
    uint8_t     *int_buf=NULL;          /*buffer for temporary value    */
    size_t      buf_size;               /*buffer size for temporary value */
    size_t	i;			/*miscellaneous counters	*/
    size_t	first;                  /*first bit(MSB) in an integer  */
    ssize_t	sfirst;			/*a signed version of `first'	*/
    H5T_conv_cb_t       cb_struct={NULL, NULL};      /*conversion callback structure */
    hbool_t     truncated;              /*if fraction value is dropped  */
    hbool_t     reverse;                /*if reverse order of destination at the end */
    H5T_conv_ret_t      except_ret;     /*return of callback function   */
    herr_t      ret_value=SUCCEED;      /* Return value                 */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            if(NULL == (src_p = (H5T_t*)H5I_object(src_id)) || NULL == (dst_p = (H5T_t*)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
            src = src_p->shared->u.atomic;
            dst = dst_p->shared->u.atomic;
            if(H5T_ORDER_LE != src.order && H5T_ORDER_BE != src.order && H5T_ORDER_VAX != src.order)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unsupported byte order")
            if(dst_p->shared->size > sizeof(dbuf))
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "destination size is too large")
            if(8 * sizeof(expo) - 1 < src.u.f.esize)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "exponent field is too large")
            cdata->need_bkg = H5T_BKG_NO;
            break;

        case H5T_CONV_FREE:
            break;

        case H5T_CONV_CONV:
            /* Get the datatypes */
            if(NULL == (src_p = (H5T_t*)H5I_object(src_id)) || NULL == (dst_p = (H5T_t*)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
            src = src_p->shared->u.atomic;
            dst = dst_p->shared->u.atomic;

            /*
             * Do we process the values from beginning to end or vice versa? Also,
             * how many of the elements have the source and destination areas
             * overlapping?
             */
            if(src_p->shared->size==dst_p->shared->size || buf_stride) {
                sp = dp = (uint8_t*)buf;
                direction = 1;
                olap = nelmts;
            } else if (src_p->shared->size>=dst_p->shared->size) {
                double olap_d = HDceil((double)(dst_p->shared->size)/
                                       (double)(src_p->shared->size-dst_p->shared->size));
                olap = (size_t)olap_d;
                sp = dp = (uint8_t*)buf;
                direction = 1;
            } else {
                double olap_d = HDceil((double)(src_p->shared->size)/
                                       (double)(dst_p->shared->size-src_p->shared->size));
                olap = (size_t)olap_d;
                sp = (uint8_t*)buf + (nelmts-1) * src_p->shared->size;
                dp = (uint8_t*)buf + (nelmts-1) * dst_p->shared->size;
                direction = -1;
            }

            /* Allocate enough space for the buffer holding temporary
             * converted value
             */
            buf_size = (size_t) (HDpow((double)2.0f, (double)src.u.f.esize) / 8 + 1);
            int_buf = (uint8_t*)H5MM_calloc(buf_size);

            /* Get conversion exception callback property */
            if(H5CX_get_dt_conv_cb(&cb_struct) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "unable to get conversion exception callback")

            /* Allocate space for order-reversed source buffer */
            src_rev = (uint8_t*)H5MM_calloc(src_p->shared->size);

            /* The conversion loop */
            for(elmtno = 0; elmtno < nelmts; elmtno++) {
                /* Set these variables to default */
                except_ret = H5T_CONV_UNHANDLED;
                truncated  = FALSE;
                reverse    = TRUE;

                /*
                 * If the source and destination buffers overlap then use a
                 * temporary buffer for the destination.
                 */
                if(direction > 0) {
                    s = sp;
                    d = elmtno<olap ? dbuf : dp;
                } else {
                    s = sp;
                    d = elmtno+olap >= nelmts ? dbuf : dp;
                }
#ifndef NDEBUG
                /* I don't quite trust the overlap calculations yet --rpm */
                if (d==dbuf) {
                    HDassert((dp>=sp && dp<sp+src_p->shared->size) ||
                            (sp>=dp && sp<dp+dst_p->shared->size));
                } else {
                    HDassert((dp<sp && dp+dst_p->shared->size<=sp) ||
                            (sp<dp && sp+src_p->shared->size<=dp));
                }
#endif
                /*
                 * Put the data in little endian order so our loops aren't so
                 * complicated.  We'll do all the conversion stuff assuming
                 * little endian and then we'll fix the order at the end.
                 */
                if (H5T_ORDER_BE==src.order) {
                    half_size = src_p->shared->size/2;
                    for (i=0; i<half_size; i++) {
                        tmp1 = s[src_p->shared->size-(i+1)];
                        s[src_p->shared->size-(i+1)] = s[i];
                        s[i] = tmp1;
                    }
                } else if (H5T_ORDER_VAX==src.order) {
                    tsize = src_p->shared->size;
                    HDassert(0 == tsize % 2);

                    for (i = 0; i < tsize; i += 4) {
                        tmp1 = s[i];
                        tmp2 = s[i+1];

                        s[i] = s[(tsize-2)-i];
                        s[i+1] = s[(tsize-1)-i];

                        s[(tsize-2)-i] = tmp1;
                        s[(tsize-1)-i] = tmp2;
                    }
                }

                /*zero-set all destination bits*/
                H5T__bit_set (d, dst.offset, dst.prec, FALSE);

                /*
                 * Find the sign bit value of the source.
                 */
                sign = (hssize_t) H5T__bit_get_d(s, src.u.f.sign, (size_t)1);

                /*
                 * Check for special cases: +0, -0, +Inf, -Inf, NaN
                 */
                if (H5T__bit_find (s, src.u.f.mpos, src.u.f.msize,
                                  H5T_BIT_LSB, TRUE)<0) {
                    if (H5T__bit_find (s, src.u.f.epos, src.u.f.esize,
                                      H5T_BIT_LSB, TRUE)<0) {
                        /* +0 or -0 */
                        /* Set all bits to zero */
                        goto padding;
                    } else if (H5T__bit_find (s, src.u.f.epos, src.u.f.esize,
                                             H5T_BIT_LSB, FALSE)<0) {
                        /* +Infinity or -Infinity */
                        if(sign) { /* -Infinity */
                            if(cb_struct.func) { /*If user's exception handler is present, use it*/
                                /*reverse order first*/
                                H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                                except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_NINF,
                                        src_id, dst_id, src_rev, d, cb_struct.user_data);
                            }

                            if(except_ret == H5T_CONV_UNHANDLED) {
                                if (H5T_SGN_2==dst.u.i.sign)
                                    H5T__bit_set (d, dst.prec-1, (size_t)1, TRUE);
                            } else if(except_ret == H5T_CONV_HANDLED) {
                                /*No need to reverse the order of destination because user handles it*/
                                reverse = FALSE;
                                goto next;
                            } else if(except_ret == H5T_CONV_ABORT)
                                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                        } else { /* +Infinity */
                            if(cb_struct.func) { /*If user's exception handler is present, use it*/
                                /*reverse order first*/
                                H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                                except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_PINF,
                                        src_id, dst_id, src_rev, d, cb_struct.user_data);
                            }

                            if(except_ret == H5T_CONV_UNHANDLED) {
                                if (H5T_SGN_NONE==dst.u.i.sign)
                                    H5T__bit_set (d, dst.offset, dst.prec, TRUE);
                                else if (H5T_SGN_2==dst.u.i.sign)
                                    H5T__bit_set (d, dst.offset, dst.prec-1, TRUE);
                            } else if(except_ret == H5T_CONV_HANDLED) {
                                /*No need to reverse the order of destination because user handles it*/
                                reverse = FALSE;
                                goto next;
                            } else if(except_ret == H5T_CONV_ABORT)
                                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                        }
                        goto padding;
                    }
                } else if (H5T_NORM_NONE==src.u.f.norm && H5T__bit_find (s, src.u.f.mpos, src.u.f.msize-1,
                                  H5T_BIT_LSB, TRUE)<0 && H5T__bit_find (s, src.u.f.epos, src.u.f.esize,
                                  H5T_BIT_LSB, FALSE)<0) {
                    /*This is a special case for the source of no implied mantissa bit.
                     *If the exponent bits are all 1s and only the 1st bit of mantissa
                     *is set to 1.  It's infinity. The Intel-Linux "long double" is this case.*/
                    /* +Infinity or -Infinity */
                    if(sign) { /* -Infinity */
                        if(cb_struct.func) { /*If user's exception handler is present, use it*/
                            /*reverse order first*/
                            H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                            except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_NINF,
                                    src_id, dst_id, src_rev, d, cb_struct.user_data);
                        }

                        if(except_ret == H5T_CONV_UNHANDLED) {
                            if (H5T_SGN_2==dst.u.i.sign)
                                H5T__bit_set (d, dst.prec-1, (size_t)1, TRUE);
                        } else if(except_ret == H5T_CONV_HANDLED) {
                            /*No need to reverse the order of destination because user handles it*/
                            reverse = FALSE;
                            goto next;
                        } else if(except_ret == H5T_CONV_ABORT)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                    } else { /* +Infinity */
                        if(cb_struct.func) { /*If user's exception handler is present, use it*/
                            /*reverse order first*/
                            H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                            except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_PINF,
                                    src_id, dst_id, src_rev, d, cb_struct.user_data);
                        }

                        if(except_ret == H5T_CONV_UNHANDLED) {
                            if (H5T_SGN_NONE==dst.u.i.sign)
                                H5T__bit_set (d, dst.offset, dst.prec, TRUE);
                            else if (H5T_SGN_2==dst.u.i.sign)
                                H5T__bit_set (d, dst.offset, dst.prec-1, TRUE);
                        } else if(except_ret == H5T_CONV_HANDLED) {
                            /*No need to reverse the order of destination because user handles it*/
                            reverse = FALSE;
                            goto next;
                        } else if(except_ret == H5T_CONV_ABORT)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                    }
                    goto padding;
                } else if (H5T__bit_find (s, src.u.f.epos, src.u.f.esize,
                                         H5T_BIT_LSB, FALSE)<0) {
                    /* NaN */
                    if(cb_struct.func) { /*If user's exception handler is present, use it*/
                        /*reverse order first*/
                        H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                        except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_NAN,
                                src_id, dst_id, src_rev, d, cb_struct.user_data);
                    }

                    if(except_ret == H5T_CONV_UNHANDLED) {
                        /*Just set all bits to zero.*/
                        goto padding;
                    } else if(except_ret == H5T_CONV_HANDLED) {
                        /*No need to reverse the order of destination because user handles it*/
                        reverse = FALSE;
                        goto next;
                    } else if(except_ret == H5T_CONV_ABORT)
                        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")

                    goto padding;
                }

                /*
                 * Get the exponent as an unsigned quantity from the section of
                 * the source bit field where it's located.   Not expecting
                 * exponent to be greater than the maximal value of hssize_t.
                 */
                expo = (hssize_t) H5T__bit_get_d(s, src.u.f.epos, src.u.f.esize);

                /*
                 * Calculate the true source exponent by adjusting according to
                 * the source exponent bias.
                 */
                if (0==expo || H5T_NORM_NONE==src.u.f.norm) {
                    expo -= (hssize_t) (src.u.f.ebias-1);
                } else if (H5T_NORM_IMPLIED==src.u.f.norm) {
                    expo -= (hssize_t) src.u.f.ebias;
                } else {
                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "normalization method not implemented yet")
                }

                /*
                 * Get the mantissa as bit vector from the section of
                 * the source bit field where it's located.
                 * Keep the little-endian order in the buffer.
                 * A sequence 0x01020304 will be like in the buffer,
                 *      04      03      02      01
                 *      |       |       |       |
                 *      V       V       V       V
                 *    buf[0]  buf[1]  buf[2]  buf[3]
                 */
                H5T__bit_copy(int_buf, (size_t)0, s, src.u.f.mpos, src.u.f.msize);

                /*
                 * Restore the implicit bit for mantissa if it's implied.
                 * Equivalent to mantissa |= (hsize_t)1<<src.u.f.msize.
                 */
                if(H5T_NORM_IMPLIED == src.u.f.norm)
                    H5T__bit_inc(int_buf, src.u.f.msize, 8 * buf_size - src.u.f.msize);

                /*
                 * Shift mantissa part by exponent minus mantissa size(right shift),
                 * or by mantissa size minus exponent(left shift).  Example: Sequence
                 * 10...010111, expo=20, expo-msize=-3.  Right-shift the sequence, we get
                 * 00010...10.  The last three bits were dropped.
                 */
                H5T__bit_shift(int_buf, expo - (ssize_t)src.u.f.msize, (size_t)0, buf_size * 8);

                /*
                 * If expo is less than mantissa size, the frantional value is dropped off
                 * during conversion.  Set exception type to be "truncate"
                 */
                if ((size_t)expo < src.u.f.msize && cb_struct.func)
                    truncated = TRUE;

                /*
                 * What is the bit position for the most significant bit(MSB) of S
                 * which is set?  This is checked before converted to negative
                 * integer.
                 */
                sfirst = H5T__bit_find(int_buf, (size_t)0, 8 * buf_size, H5T_BIT_MSB, TRUE);
                first = (size_t)sfirst;

                if(sfirst < 0) {
                    /*
                     * The source has no bits set and must therefore be zero.
                     * Set the destination to zero - nothing to do.
                     */
                } else if (H5T_SGN_NONE==dst.u.i.sign) { /*destination is unsigned*/
                    /*
                     * Destination is unsigned.  Library's default way: If the source value
                     * is greater than the maximal destination value then it overflows, the
                     * destination will be set to the maximum possible value.  When the
                     * source is negative, underflow happens.  Set the destination to be
                     * zero(do nothing).  If user's exception handler is set, call it and
                     * let user handle it.
                     */
                    if(sign) { /*source is negative*/
                        if(cb_struct.func) { /*If user's exception handler is present, use it*/
                            /*reverse order first*/
                            H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                            except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_LOW,
                                    src_id, dst_id, src_rev, d, cb_struct.user_data);
                            if(except_ret == H5T_CONV_ABORT)
                                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                            else if(except_ret == H5T_CONV_HANDLED) {
                                /*No need to reverse the order of destination because user handles it*/
                                reverse = FALSE;
                                goto next;
                            }
                        }
                    } else { /*source is positive*/
                        if (first>=dst.prec) {
                            /*overflow*/
                            if(cb_struct.func) { /*If user's exception handler is present, use it*/
                                /*reverse order first*/
                                H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                                except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI,
                                        src_id, dst_id, src_rev, d, cb_struct.user_data);
                            }

                            if(except_ret == H5T_CONV_UNHANDLED)
                                H5T__bit_set (d, dst.offset, dst.prec, TRUE);
                            else if(except_ret == H5T_CONV_HANDLED) {
                                /*No need to reverse the order of destination because user handles it*/
                                reverse = FALSE;
                                goto next;
                            } else if(except_ret == H5T_CONV_ABORT)
                                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                        } else if (first <dst.prec) {
                            if(truncated && cb_struct.func) { /*If user's exception handler is present, use it*/
                                /*reverse order first*/
                                H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                                except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_TRUNCATE,
                                        src_id, dst_id, src_rev, d, cb_struct.user_data);
                            }

                            if(except_ret == H5T_CONV_UNHANDLED)
                                /*copy source value into it if case is ignored by user handler*/
                                H5T__bit_copy (d, dst.offset, int_buf, (size_t)0, first+1);
                            else if(except_ret == H5T_CONV_HANDLED) {
                                /*No need to reverse the order of destination because user handles it*/
                                reverse = FALSE;
                                goto next;
                            } else if(except_ret == H5T_CONV_ABORT)
                                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                        }
                    }
                } else if (H5T_SGN_2==dst.u.i.sign) {  /*Destination is signed*/
                    if(sign) { /*source is negative*/
                        if(first < dst.prec-1) {
                            if(truncated && cb_struct.func) { /*If user's exception handler is present, use it*/
                                /*reverse order first*/
                                H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                                except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_TRUNCATE,
                                        src_id, dst_id, src_rev, d, cb_struct.user_data);
                            }

                            if(except_ret == H5T_CONV_UNHANDLED) { /*If this case ignored by user handler*/
                                /*Convert to integer representation.  Equivalent to ~(value - 1).*/
                                H5T__bit_dec(int_buf, (size_t)0, 8 * buf_size);
                                H5T__bit_neg(int_buf, (size_t)0, 8 * buf_size);

                                /*copy source value into destination*/
                                H5T__bit_copy(d, dst.offset, int_buf, (size_t)0, dst.prec-1);
                                H5T__bit_set(d, (dst.offset + dst.prec-1), (size_t)1, TRUE);
                            } else if(except_ret == H5T_CONV_ABORT)
                                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                            else if(except_ret == H5T_CONV_HANDLED) {
                                /*No need to reverse the order of destination because user handles it*/
                                reverse = FALSE;
                                goto next;
                            }
                        } else {
                            /* if underflows and no callback, do nothing except turn on
                             * the sign bit because 0x80...00 is the biggest negative value.
                             */
                            if(cb_struct.func) { /*If user's exception handler is present, use it*/
                                /*reverse order first*/
                                H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                                except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_LOW,
                                        src_id, dst_id, src_rev, d, cb_struct.user_data);
                            }

                            if(except_ret == H5T_CONV_UNHANDLED)
                                H5T__bit_set(d, (dst.offset + dst.prec-1), (size_t)1, TRUE);
                            else if(except_ret == H5T_CONV_ABORT)
                                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                            else if(except_ret == H5T_CONV_HANDLED) {
                                /*No need to reverse the order of destination because user handles it*/
                                reverse = FALSE;
                                goto next;
                            }
                        }
                    } else { /*source is positive*/
                        if (first >= dst.prec-1) {
                            /*overflow*/
                            if(cb_struct.func) { /*If user's exception handler is present, use it*/
                                /*reverse order first*/
                                H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                                except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI,
                                        src_id, dst_id, src_rev, d, cb_struct.user_data);
                            }

                            if(except_ret == H5T_CONV_UNHANDLED)
                                H5T__bit_set(d, dst.offset, dst.prec-1, TRUE);
                            else if(except_ret == H5T_CONV_ABORT)
                                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                            else if(except_ret == H5T_CONV_HANDLED) {
                                /*No need to reverse the order of destination because user handles it*/
                                reverse = FALSE;
                                goto next;
                            }
                        } else if(first < dst.prec-1) {
                            if(truncated && cb_struct.func) { /*If user's exception handler is present, use it*/
                                /*reverse order first*/
                                H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order);
                                except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_TRUNCATE,
                                        src_id, dst_id, src_rev, d, cb_struct.user_data);
                            }

                            if(except_ret == H5T_CONV_UNHANDLED) {
                                /*copy source value into it if case is ignored by user handler*/
                                H5T__bit_copy (d, dst.offset, int_buf, (size_t)0, first+1);
                            } else if(except_ret == H5T_CONV_ABORT)
                                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                            else if(except_ret == H5T_CONV_HANDLED) {
                                /*No need to reverse the order of destination because user handles it*/
                                reverse = FALSE;
                                goto next;
                            }
                        }
                    }
                }

            padding:
                /*
                 * Set padding areas in destination.
                 */
                if (dst.offset>0) {
                    HDassert(H5T_PAD_ZERO==dst.lsb_pad || H5T_PAD_ONE==dst.lsb_pad);
                    H5T__bit_set(d, (size_t)0, dst.offset, (hbool_t)(H5T_PAD_ONE==dst.lsb_pad));
                }
                if (dst.offset+dst.prec!=8*dst_p->shared->size) {
                    HDassert(H5T_PAD_ZERO==dst.msb_pad || H5T_PAD_ONE==dst.msb_pad);
                    H5T__bit_set(d, dst.offset+dst.prec,
                                 8*dst_p->shared->size - (dst.offset+ dst.prec),
                                 (hbool_t)(H5T_PAD_ONE==dst.msb_pad));
                }

                /*
                 * Put the destination in the correct byte order.  See note at
                 * beginning of loop.
                 */
                if (H5T_ORDER_BE==dst.order && reverse) {
                    half_size = dst_p->shared->size/2;
                    for (i=0; i<half_size; i++) {
                        tmp1 = d[dst_p->shared->size-(i+1)];
                        d[dst_p->shared->size-(i+1)] = d[i];
                        d[i] = tmp1;
                    }
                }

            next:
                /*
                 * If we had used a temporary buffer for the destination then we
                 * should copy the value to the true destination buffer.
                 */
                if (d==dbuf)
                    H5MM_memcpy (dp, d, dst_p->shared->size);
                if (buf_stride) {
                    sp += direction * (ssize_t) buf_stride;
                    dp += direction * (ssize_t) buf_stride;
                } else {
                    sp += direction * (ssize_t) src_p->shared->size;
                    dp += direction * (ssize_t) dst_p->shared->size;
                }

                HDmemset(int_buf, 0, buf_size);
            }

            break;

        default:
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    } /* end switch */

done:
    if(int_buf)
        H5MM_xfree(int_buf);
    if(src_rev)
        H5MM_free(src_rev);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_f_i() */


/*-------------------------------------------------------------------------
 * Function:	H5T__conv_i_f
 *
 * Purpose:	Convert one integer type to a floating-point type.  This is
 *              the catch-all function for integer-float conversions and
 *              is probably not particularly fast.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *		Friday, Feb 6, 2004
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T__conv_i_f(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
    size_t buf_stride, size_t H5_ATTR_UNUSED bkg_stride, void *buf, void H5_ATTR_UNUSED *bkg)
{
    /* Traversal-related variables */
    H5T_t	*src_p;			/*source datatype		*/
    H5T_t	*dst_p;			/*destination datatype		*/
    H5T_atomic_t src;			/*atomic source info		*/
    H5T_atomic_t dst;			/*atomic destination info	*/
    int	direction;		/*forward or backward traversal	*/
    size_t	elmtno;			/*element number		*/
    size_t	half_size;		/*half the type size		*/
    size_t      tsize;                  /*type size for swapping bytes  */
    size_t	olap;			/*num overlapping elements	*/
    uint8_t	*s, *sp, *d, *dp;	/*source and dest traversal ptrs*/
    uint8_t     *src_rev = NULL;        /*order-reversed source buffer  */
    uint8_t	dbuf[64];		/*temp destination buffer	*/
    uint8_t     tmp1, tmp2;             /*temp variables for swapping bytes*/

    /* Conversion-related variables */
    hsize_t	expo;			/*destination exponent		*/
    hsize_t	expo_max;		/*maximal possible exponent value       */
    size_t      sign;                   /*source sign bit value         */
    hbool_t     is_max_neg;             /*source is maximal negative value*/
    hbool_t     do_round;               /*whether there is roundup      */
    uint8_t     *int_buf = NULL;        /*buffer for temporary value    */
    size_t      buf_size;               /*buffer size for temporary value */
    size_t	i;			/*miscellaneous counters	*/
    size_t	first;                  /*first bit(MSB) in an integer  */
    ssize_t	sfirst;			/*a signed version of `first'	*/
    H5T_conv_cb_t       cb_struct = {NULL, NULL};      /*conversion callback structure */
    H5T_conv_ret_t      except_ret;     /*return of callback function   */
    hbool_t             reverse;        /*if reverse the order of destination   */
    herr_t      ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_PACKAGE

    switch(cdata->command) {
        case H5T_CONV_INIT:
            if(NULL == (src_p = (H5T_t *)H5I_object(src_id)) || NULL == (dst_p = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
            src = src_p->shared->u.atomic;
            dst = dst_p->shared->u.atomic;
            if(H5T_ORDER_LE != dst.order && H5T_ORDER_BE != dst.order && H5T_ORDER_VAX != dst.order)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unsupported byte order")
            if(dst_p->shared->size > sizeof(dbuf))
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "destination size is too large")
            if(8 * sizeof(expo) - 1 < src.u.f.esize)
                HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "exponent field is too large")
            cdata->need_bkg = H5T_BKG_NO;
            break;

        case H5T_CONV_FREE:
            break;

        case H5T_CONV_CONV:
            /* Get the datatypes */
            if(NULL == (src_p = (H5T_t *)H5I_object(src_id)) || NULL == (dst_p = (H5T_t *)H5I_object(dst_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
            src = src_p->shared->u.atomic;
            dst = dst_p->shared->u.atomic;

            /*
             * Do we process the values from beginning to end or vice versa? Also,
             * how many of the elements have the source and destination areas
             * overlapping?
             */
            if (src_p->shared->size==dst_p->shared->size || buf_stride) {
                sp = dp = (uint8_t*)buf;
                direction = 1;
                olap = nelmts;
            } else if (src_p->shared->size>=dst_p->shared->size) {
                double olap_d = HDceil((double)(dst_p->shared->size)/
                                       (double)(src_p->shared->size-dst_p->shared->size));
                olap = (size_t)olap_d;
                sp = dp = (uint8_t*)buf;
                direction = 1;
            } else {
                double olap_d = HDceil((double)(src_p->shared->size)/
                                       (double)(dst_p->shared->size-src_p->shared->size));
                olap = (size_t)olap_d;
                sp = (uint8_t*)buf + (nelmts-1) * src_p->shared->size;
                dp = (uint8_t*)buf + (nelmts-1) * dst_p->shared->size;
                direction = -1;
            }

            /* Allocate enough space for the buffer holding temporary
             * converted value
             */
            buf_size = (src.prec > dst.u.f.msize ? src.prec : dst.u.f.msize)/8 + 1;
            int_buf = (uint8_t*)H5MM_calloc(buf_size);

            /* Get conversion exception callback property */
            if(H5CX_get_dt_conv_cb(&cb_struct) < 0)
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "unable to get conversion exception callback")

            /* Allocate space for order-reversed source buffer */
            src_rev = (uint8_t*)H5MM_calloc(src_p->shared->size);

            /* The conversion loop */
            for (elmtno=0; elmtno<nelmts; elmtno++) {
                /* Set these variables to default */
                except_ret = H5T_CONV_UNHANDLED;
                reverse    = TRUE;

                /* Make sure these variables are reset to 0. */
                sign = 0;               /*source sign bit value         */
                is_max_neg = 0;         /*source is maximal negative value*/
                do_round = 0;           /*whether there is roundup      */
                sfirst = 0;

                /*
                 * If the source and destination buffers overlap then use a
                 * temporary buffer for the destination.
                 */
                if (direction>0) {
                    s = sp;
                    d = elmtno<olap ? dbuf : dp;
                } else {
                    s = sp;
                    d = elmtno+olap >= nelmts ? dbuf : dp;
                }
#ifndef NDEBUG
                /* I don't quite trust the overlap calculations yet --rpm */
                if (d==dbuf) {
                    HDassert((dp>=sp && dp<sp+src_p->shared->size) ||
                            (sp>=dp && sp<dp+dst_p->shared->size));
                } else {
                    HDassert((dp<sp && dp+dst_p->shared->size<=sp) ||
                            (sp<dp && sp+src_p->shared->size<=dp));
                }
#endif

                /* Put the data in little endian order so our loops aren't so
                 * complicated.  We'll do all the conversion stuff assuming
                 * little endian and then we'll fix the order at the end.
                 */
                if (H5T_ORDER_BE==src.order) {
                    half_size = src_p->shared->size/2;
                    for (i=0; i<half_size; i++) {
                        tmp1 = s[src_p->shared->size-(i+1)];
                        s[src_p->shared->size-(i+1)] = s[i];
                        s[i] = tmp1;
                    }
                }

                /* Zero-set all destination bits*/
                H5T__bit_set (d, dst.offset, dst.prec, FALSE);

                /* Copy source into a temporary buffer */
                H5T__bit_copy(int_buf, (size_t)0, s, src.offset, src.prec);

                /* Find the sign bit value of the source */
                if(H5T_SGN_2 == src.u.i.sign)
                    sign = (size_t)H5T__bit_get_d(int_buf, src.prec - 1, (size_t)1);

                /* What is the bit position(starting from 0 as first one) for the most significant
                 * bit(MSB) of S which is set?
                 */
                if(H5T_SGN_2 == src.u.i.sign) {
                    sfirst = H5T__bit_find(int_buf, (size_t)0, src.prec - 1, H5T_BIT_MSB, TRUE);
                    if(sign && sfirst < 0)
                        /* The case 0x80...00, which is negative with maximal value */
                        is_max_neg = 1;
                } else if(H5T_SGN_NONE == src.u.i.sign)
                    sfirst = H5T__bit_find(int_buf, (size_t)0, src.prec, H5T_BIT_MSB, TRUE);

                /* Handle special cases here.  Integer is zero */
                if(!sign && sfirst < 0)
                    goto padding;

                /* Convert source integer if it's negative */
                if(H5T_SGN_2 == src.u.i.sign && sign) {
                    if(!is_max_neg) {
                        /* Equivalent to ~(i - 1) */
                        H5T__bit_dec(int_buf, (size_t)0, buf_size * 8);
                        H5T__bit_neg(int_buf, (size_t)0, buf_size * 8);
                        sfirst = H5T__bit_find(int_buf, (size_t)0, src.prec - 1, H5T_BIT_MSB, TRUE);
                    } else {
                        /* If it's maximal negative number 0x80...000, treat it as if it overflowed
                         * (create a carry) to help conversion.  i.e. a character type number 0x80
                         * is treated as 0x100.
                         */
                        sfirst = (ssize_t)(src.prec - 1);
                        is_max_neg = 0;
                    }
                    if(sfirst < 0)
                        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "zero bit not found")

                    /* Sign bit has been negated if bit vector isn't 0x80...00.  Set all bits in front of
                     * sign bit to 0 in the temporary buffer because they're all negated from the previous
                     * step.
                     */
                    H5T__bit_set(int_buf, src.prec, (buf_size * 8) - src.prec, 0);

                    /* Set sign bit in destination */
                    H5T__bit_set_d(d, dst.u.f.sign, (size_t)1, (hsize_t)sign);
                } /* end if */

                first = (size_t)sfirst;

                /* Calculate the true destination exponent by adjusting according to
                 * the destination exponent bias.  Implied and non-implied normalization
                 * should be the same.
                 */
                if (H5T_NORM_NONE==dst.u.f.norm || H5T_NORM_IMPLIED==dst.u.f.norm) {
                    expo = first + dst.u.f.ebias;
                }
                else {
                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "normalization method not implemented yet")
                }

                /* Handle mantissa part here */
                if (H5T_NORM_IMPLIED==dst.u.f.norm) {
                    /* Imply first bit */
                    H5T__bit_set(int_buf, first, (size_t)1, 0);
       		}
            else if (H5T_NORM_NONE==dst.u.f.norm) {
                first++;
		}

                /* Roundup for mantissa */
                if(first > dst.u.f.msize) {
                    /* If the bit sequence is bigger than the mantissa part, there'll be some
                     * precision loss.  Let user's handler deal with the case if it's present
                     */
                    if(cb_struct.func) {
                        H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order); /*reverse order first*/
                        except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_PRECISION, src_id, dst_id,
                                src_rev, d, cb_struct.user_data);
                    }

                    if(except_ret == H5T_CONV_HANDLED) {
                        reverse = FALSE;
                        goto padding;
                    }
                    else if(except_ret == H5T_CONV_ABORT)
                        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")

                    /* If user's exception handler does deal with it, we do it by dropping off the
                     * extra bits at the end and do rounding.  If we have .50...0(decimal) after radix
                     * point, we do roundup when the least significant digit before radix is odd, we do
                     * rounddown if it's even.
                     */

                    /* Check 1st dropoff bit, see if it's set. */
                    if(H5T__bit_get_d(int_buf, ((first - dst.u.f.msize) - 1), (size_t)1)) {
                    	/* Check all bits after 1st dropoff bit, see if any of them is set. */
                        if(((first - dst.u.f.msize) - 1) > 0 && H5T__bit_get_d(int_buf, (size_t)0, ((first - dst.u.f.msize) - 1)))
                            do_round = 1;
                        else {  /* The .50...0 case */
                            /* Check if the least significant bit is odd. */
                            if(H5T__bit_get_d(int_buf, (first - dst.u.f.msize), (size_t)1))
                               do_round = 1;
                        }
		    }

                    /* Right shift to drop off extra bits */
                    H5T__bit_shift(int_buf, (ssize_t)(dst.u.f.msize - first), (size_t)0, buf_size * 8);

                    if(do_round) {
                        H5T__bit_inc(int_buf, (size_t)0, buf_size * 8);
                        do_round = 0;

			/* If integer is like 0x0ff...fff and we need to round up the
			 * last f, we get 0x100...000.  Treat this special case here.
			 */
                    	if(H5T__bit_get_d(int_buf, dst.u.f.msize, (size_t)1)) {
                	    if (H5T_NORM_IMPLIED==dst.u.f.norm) {
			        /* The bit at this 1's position was impled already, so this
			         * number should be 0x200...000.  We need to increment the
			         * exponent in this case.
			         */
			    	expo++;
       			    } else if (H5T_NORM_NONE==dst.u.f.norm) {
				/* Right shift 1 bit to let the carried 1 fit in the mantissa,
				 * and increment exponent by 1.
				 */
                                H5T__bit_shift(int_buf, (ssize_t)-1, (size_t)0, buf_size * 8);
			 	expo++;
			    }
			}
                    }
                } else {
                    /* The bit sequence can fit mantissa part.  Left shift to fit in from high-order of
		     * bit position. */
                    H5T__bit_shift(int_buf, (ssize_t)(dst.u.f.msize - first), (size_t)0, dst.u.f.msize);
                }


                /* Check if the exponent is too big */
                expo_max = (hsize_t) (HDpow((double)2.0f, (double)dst.u.f.esize) - 1);

                if(expo > expo_max) {  /*overflows*/
                    if(cb_struct.func) { /*user's exception handler.  Reverse back source order*/
                        H5T_reverse_order(src_rev, s, src_p->shared->size, src_p->shared->u.atomic.order); /*reverse order first*/
                        except_ret = (cb_struct.func)(H5T_CONV_EXCEPT_RANGE_HI, src_id, dst_id,
                                src_rev, d, cb_struct.user_data);

                        if(except_ret == H5T_CONV_ABORT)
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCONVERT, FAIL, "can't handle conversion exception")
                        else if(except_ret == H5T_CONV_HANDLED) {
                            reverse = FALSE;
                            goto padding;
                        }
                    } else {
                        /*make destination infinity by setting exponent to maximal number and
                         *mantissa to zero.*/
                        expo = expo_max;
                        HDmemset(int_buf, 0, buf_size);
                    }
                }

                if(except_ret == H5T_CONV_UNHANDLED) {
                    /* Set exponent in destination */
                    H5T__bit_set_d(d, dst.u.f.epos, dst.u.f.esize, expo);

                    /* Copy mantissa into destination */
                    H5T__bit_copy(d, dst.u.f.mpos, int_buf, (size_t)0, (buf_size * 8) > dst.u.f.msize ? dst.u.f.msize : buf_size * 8);
                }

            padding:
                /*
                 * Set padding areas in destination.
                 */
                if(dst.offset > 0) {
                    HDassert(H5T_PAD_ZERO == dst.lsb_pad || H5T_PAD_ONE == dst.lsb_pad);
                    H5T__bit_set(d, (size_t)0, dst.offset, (hbool_t)(H5T_PAD_ONE==dst.lsb_pad));
                }
                if(dst.offset + dst.prec != 8 * dst_p->shared->size) {
                    HDassert(H5T_PAD_ZERO == dst.msb_pad || H5T_PAD_ONE == dst.msb_pad);
                    H5T__bit_set(d, dst.offset + dst.prec,
                                 8 * dst_p->shared->size - (dst.offset + dst.prec),
                                 (hbool_t)(H5T_PAD_ONE == dst.msb_pad));
                }

                /*
                 * Put the destination in the correct byte order.  See note at
                 * beginning of loop.
                 */
                if (H5T_ORDER_BE==dst.order && reverse) {
                    half_size = dst_p->shared->size/2;
                    for (i=0; i<half_size; i++) {
                        uint8_t tmp = d[dst_p->shared->size-(i+1)];
                        d[dst_p->shared->size-(i+1)] = d[i];
                        d[i] = tmp;
                    }
                } else if (H5T_ORDER_VAX==dst.order && reverse) {
                    tsize = dst_p->shared->size;
                    HDassert(0 == tsize % 2);

                    for (i = 0; i < tsize; i += 4) {
                        tmp1 = d[i];
                        tmp2 = d[i+1];

                        d[i] = d[(tsize-2)-i];
                        d[i+1] = d[(tsize-1)-i];

                        d[(tsize-2)-i] = tmp1;
                        d[(tsize-1)-i] = tmp2;
                    }
                }

                /*
                 * If we had used a temporary buffer for the destination then we
                 * should copy the value to the true destination buffer.
                 */
                if (d==dbuf)
                    H5MM_memcpy (dp, d, dst_p->shared->size);
                if (buf_stride) {
                    sp += direction * (ssize_t) buf_stride;
                    dp += direction * (ssize_t) buf_stride;
                } else {
                    sp += direction * (ssize_t) src_p->shared->size;
                    dp += direction * (ssize_t) dst_p->shared->size;
                }

                HDmemset(int_buf, 0, buf_size);
            }

            break;

        default:
            HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "unknown conversion command")
    } /* end switch */

done:
    if(int_buf)
        H5MM_xfree(int_buf);
    if(src_rev)
        H5MM_free(src_rev);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T__conv_i_f() */


/*-------------------------------------------------------------------------
 * Function:	H5T_reverse_order
 *
 * Purpose:	Internal assisting function to reverse the order of
 *              a sequence of byte when it's big endian or VAX order.
 *              The byte sequence simulates the endian order.
 *
 * Return:      Success:        A pointer to the reversed byte sequence
 *
 *              Failure:        Null
 *
 * Programmer:	Raymond Lu
 *		April 26, 2004
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5T_reverse_order(uint8_t *rev, uint8_t *s, size_t size, H5T_order_t order)
{
    size_t      i;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    HDassert(s);
    HDassert(size);

    if (H5T_ORDER_VAX == order) {
        for (i = 0; i < size; i += 2) {
            rev[i] = s[(size - 2) - i];
            rev[i + 1] = s[(size - 1) - i];
        }
    } else if (H5T_ORDER_BE == order) {
        for (i=0; i<size; i++)
            rev[size-(i+1)] = s[i];
    } else {
        for (i=0; i<size; i++)
            rev[i] = s[i];
    }

    FUNC_LEAVE_NOAPI(SUCCEED)
}


/*-------------------------------------------------------------------------
 * Function:    H5T_reclaim
 *
 * Purpose: Frees the buffers allocated for storing variable-length data
 *          in memory. Only frees the VL data in the selection defined in the
 *          dataspace.
 *
 * Return:  Non-negative on success/Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T_reclaim(hid_t type_id, H5S_t *space, void *buf)
{
    H5T_t *type;                /* Datatype */
    H5S_sel_iter_op_t dset_op;  /* Operator for iteration */
    H5T_vlen_alloc_info_t vl_alloc_info;   /* VL allocation info */
    herr_t ret_value = FAIL;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Check args */
    HDassert(H5I_DATATYPE == H5I_get_type(type_id));
    HDassert(space);
    HDassert(buf);

    if(NULL == (type = (H5T_t *)H5I_object_verify(type_id, H5I_DATATYPE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an valid base datatype")

    /* Get the allocation info */
    if(H5CX_get_vlen_alloc_info(&vl_alloc_info) < 0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "unable to retrieve VL allocation info")

    /* Call H5S_select_iterate with args, etc. */
    dset_op.op_type = H5S_SEL_ITER_OP_LIB;
    dset_op.u.lib_op = H5T_reclaim_cb;

    ret_value = H5S_select_iterate(buf, type, space, &dset_op, &vl_alloc_info);

done:
    FUNC_LEAVE_NOAPI(ret_value)
}   /* end H5T_reclaim() */


/*-------------------------------------------------------------------------
 * Function:    H5T_reclaim_cb
 *
 * Purpose: Iteration callback to reclaim conversion allocated memory for a
 *          buffer element.
 *
 * Return:  Non-negative on success/Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T_reclaim_cb(void *elem, const H5T_t *dt, unsigned H5_ATTR_UNUSED ndim,
    const hsize_t H5_ATTR_UNUSED *point, void *op_data)
{
    herr_t ret_value = SUCCEED;     /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Sanity check */
    HDassert(elem);
    HDassert(dt);

    if(dt->shared->type == H5T_REFERENCE) {
        if(H5T_ref_reclaim(elem, dt) < 0)
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTFREE, FAIL, "can't reclaim ref elements")
    } else {
        HDassert(op_data);

        /* Allow vlen reclaim to recurse into that routine */
        if(H5T_vlen_reclaim(elem, dt, (H5T_vlen_alloc_info_t *)op_data) < 0)
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTFREE, FAIL, "can't reclaim vlen elements")
    }

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T_reclaim_cb() */
	Commit message (Expand)	Author	Age	Files	Lines
*	Squashed commit of the token_refactoring branch:	Dana Robinson	2020-01-16	1	-10/+10

*	Fix some places where H5P_DEFAULT gets passed down to a VOL connector	Jordan Henderson	2020-01-03	1	-3/+6

*	Refactor all the 'H5VL_*_optional' callbacks to move the type of operation out	Quincey Koziol	2019-12-20	1	-2/+2

*	Refactor attribute creation parameters to move parameters out of creation	Quincey Koziol	2019-04-25	1	-12/+1

*	Moved private native VOL connector functions to H5VLnative_private.h.	Dana Robinson	2018-12-20	1	-1/+2

*	Moved the optional enums to H5VLnative.h and converted to an int	Dana Robinson	2018-12-18	1	-0/+1

*	Moved the native VOL connector's optional enums to the	Dana Robinson	2018-12-15	1	-2/+2

*	Switch loc_params to VOL callbacks to pass struct by pointer instead of by	Quincey Koziol	2018-11-22	1	-4/+4

*	Switch switch remainder of API routines to use VOL callbacks.	Quincey Koziol	2018-11-10	1	-10/+15

*	Switch driver \| plugin => connector.	Quincey Koziol	2018-11-04	1	-6/+6

*	Refactor and standardize object VOL callbacks.	Quincey Koziol	2018-11-01	1	-2/+1

*	Convert attribute VOL callbacks to a standard form that sets up the wrapper	Quincey Koziol	2018-10-29	1	-11/+8

*	Merge branch 'develop' of https://bitbucket.hdfgroup.org/scm/hdffv/hdf5 into ...	Quincey Koziol	2018-10-25	1	-10/+10
\|\
\| *	Updates to the VOL ID and object API calls.	Dana Robinson	2018-10-17	1	-7/+7

* \|	Squashed commit of private branch changes to support stackable VOL plugins.	Quincey Koziol	2018-10-25	1	-10/+10
\|/
*	VOL FEATURE	Dana Robinson	2018-10-10	1	-78/+86

*	Remainder of vol_normalization changes (dataset, attribute, files, objects).	Dana Robinson	2018-09-24	1	-65/+66

*	Removed 'VOL' versions of FUNC_ENTER macros as well as empty functions	Dana Robinson	2018-09-18	1	-1/+1

*	Merge branch 'develop' of https://bitbucket.hdfgroup.org/scm/hdffv/hdf5 into ...	Quincey Koziol	2018-04-29	1	-42/+37
\|\
\| *	Remove redundant 'is_collective' parameter from H5CX_set_loc.	Quincey Koziol	2018-03-27	1	-1/+1

\| *	Cleanup API context function usage.	Quincey Koziol	2018-03-19	1	-42/+3

\| *	Add API context interface and use it throughout the library.	Quincey Koziol	2018-03-15	1	-35/+71

\| *	Merge pull request #426 in HDFFV/hdf5 from ~LRKNOX/hdf5_lrk:hdf5_1_10 to hdf5...	Larry Knox	2017-04-25	1	-6/+4

* \|	Checkpoint normalization against incoming hyperslab / selection / dataspace	Quincey Koziol	2017-03-28	1	-1/+1
\|/
*	[svn-r29081] - merge in the phdf5_metadata_opt/ branch with the collective me...	Mohamad Chaarawi	2016-02-10	1	-5/+5

*	[svn-r28950] - remove META_FLUSH_COLLECTIVELY property for delayed sanity che...	Mohamad Chaarawi	2016-01-21	1	-4/+4

*	[svn-r27768] Description:	Quincey Koziol	2015-09-14	1	-50/+2

*	[svn-r25766] Description:	Quincey Koziol	2014-11-03	1	-1/+1

*	[svn-r25721] The return type of H5A_create was changed from hid_t to H5A_t *	Albert Cheng	2014-10-20	1	-1/+1

*	[svn-r25468] some code refactoring to align trunk with VOL branch.	Mohamad Chaarawi	2014-07-22	1	-1/+6

*	[svn-r25273] Description:	Quincey Koziol	2014-06-13	1	-1/+1

*	[svn-r24998] Description:	Quincey Koziol	2014-04-09	1	-0/+24

*	[svn-r22582] Description:	Quincey Koziol	2012-07-16	1	-6/+6

*	[svn-r21919] Description:	Quincey Koziol	2012-02-09	1	-6/+6

*	[svn-r20885] Description:	Quincey Koziol	2011-05-20	1	-1/+1

*	[svn-r18564] Description:	Quincey Koziol	2010-04-15	1	-0/+13

*	[svn-r15485] Purpose: Allow library to shut down properly when objects have r...	Neil Fortner	2008-08-19	1	-2/+2

*	[svn-r14903] Undoing change committed in r14902.	Scot Breitenfeld	2008-04-30	1	-0/+2

*	[svn-r14902] Merged fortran_1_8 branch changes r14505:14901 into the trunk. N...	Scot Breitenfeld	2008-04-30	1	-2/+0

*	[svn-r14720] Description:	Quincey Koziol	2008-03-11	1	-0/+2

*	[svn-r14222] Description:	Quincey Koziol	2007-10-30	1	-42/+0

*	[svn-r14219] Description:	Quincey Koziol	2007-10-30	1	-43/+0

*	[svn-r14187] Description:	Quincey Koziol	2007-10-04	1	-6/+11

*	[svn-r14185] Description:	Quincey Koziol	2007-10-04	1	-1/+1

*	[svn-r14184] Description:	Quincey Koziol	2007-10-04	1	-1/+5

*	[svn-r14183] Description:	Quincey Koziol	2007-10-04	1	-1/+1

*	[svn-r14180] Description:	Quincey Koziol	2007-10-04	1	-8/+8

*	[svn-r14163] Description:	Quincey Koziol	2007-09-27	1	-4/+8

*	[svn-r14162] Description:	Quincey Koziol	2007-09-27	1	-5/+9

*	[svn-r13475] There's a configure issue linking szip's shared libraries when r...	Mike McGreevy	2007-03-08	1	-5/+5