path: root/src/H5T.c

/****************************************************************************
* NCSA HDF                                                                 *
* Software Development Group                                               *
* National Center for Supercomputing Applications                          *
* University of Illinois at Urbana-Champaign                               *
* 605 E. Springfield, Champaign IL 61820                                   *
*                                                                          *
* For conditions of distribution and use, see the accompanying             *
* hdf/COPYING file.                                                        *
*                                                                          *
****************************************************************************/

#ifdef RCSID
static char             RcsId[] = "@(#)$Revision$";
#endif

#define H5T_PACKAGE             /*suppress error about including H5Tpkg   */

#include <H5private.h>          /*generic functions                       */
#include <H5Aprivate.h>         /*atom functions                  */
#include <H5Eprivate.h>         /*error handling                  */
#include <H5Mprivate.h>         /*meta data                               */
#include <H5MMprivate.h>        /*memory management                       */
#include <H5Pprivate.h>         /*data space                              */
#include <H5Tpkg.h>             /*data-type functions                     */

#define PABLO_MASK      H5T_mask

#define H5T_COMPND_INC  64      /*typical max numb of members per struct */

/* Interface initialization */
static intn             interface_initialize_g = FALSE;
#define INTERFACE_INIT H5T_init_interface
static void             H5T_term_interface(void);

/* Predefined types */
hid_t                   H5T_NATIVE_CHAR_g = FAIL;
hid_t                   H5T_NATIVE_UCHAR_g = FAIL;
hid_t                   H5T_NATIVE_SHORT_g = FAIL;
hid_t                   H5T_NATIVE_USHORT_g = FAIL;
hid_t                   H5T_NATIVE_INT_g = FAIL;
hid_t                   H5T_NATIVE_UINT_g = FAIL;
hid_t                   H5T_NATIVE_LONG_g = FAIL;
hid_t                   H5T_NATIVE_LLONG_g = FAIL;
hid_t                   H5T_NATIVE_ULLONG_g = FAIL;
hid_t                   H5T_NATIVE_HYPER_g = FAIL;
hid_t                   H5T_NATIVE_UHYPER_g = FAIL;
hid_t                   H5T_NATIVE_INT8_g = FAIL;
hid_t                   H5T_NATIVE_UINT8_g = FAIL;
hid_t                   H5T_NATIVE_INT16_g = FAIL;
hid_t                   H5T_NATIVE_UINT16_g = FAIL;
hid_t                   H5T_NATIVE_INT32_g = FAIL;
hid_t                   H5T_NATIVE_UINT32_g = FAIL;
hid_t                   H5T_NATIVE_INT64_g = FAIL;
hid_t                   H5T_NATIVE_UINT64_g = FAIL;
hid_t                   H5T_NATIVE_ULONG_g = FAIL;
hid_t                   H5T_NATIVE_FLOAT_g = FAIL;
hid_t                   H5T_NATIVE_DOUBLE_g = FAIL;
hid_t                   H5T_NATIVE_TIME_g = FAIL;
hid_t                   H5T_NATIVE_STRING_g = FAIL;
hid_t                   H5T_NATIVE_BITFIELD_g = FAIL;
hid_t                   H5T_NATIVE_OPAQUE_g = FAIL;

/* The path database */
static intn             H5T_npath_g = 0;        /*num paths defined     */
static intn             H5T_apath_g = 0;        /*num slots allocated   */
static H5T_path_t      *H5T_path_g = NULL;      /*path array            */

/* The soft conversion function master list */
static intn             H5T_nsoft_g = 0;        /*num soft funcs defined */
static intn             H5T_asoft_g = 0;        /*num slots allocated   */
static H5T_soft_t      *H5T_soft_g = NULL;      /*master soft list      */

/*--------------------------------------------------------------------------
NAME
   H5T_init_interface -- Initialize interface-specific information
USAGE
    herr_t H5T_init_interface()
   
RETURNS
   SUCCEED/FAIL
DESCRIPTION
    Initializes any interface-specific data or routines.

--------------------------------------------------------------------------*/
herr_t
H5T_init_interface(void)
{
    H5T_t                  *dt = NULL;
    herr_t                  ret_value = SUCCEED;

    interface_initialize_g = TRUE;
    FUNC_ENTER(H5T_init_interface, FAIL);

    /* Initialize the atom group for the file IDs */
    if ((ret_value = H5A_init_group(H5_DATATYPE, H5A_DATATYPEID_HASHSIZE,
				    H5T_RESERVED_ATOMS,
				    (herr_t (*)(void *)) H5T_close)) != FAIL) {
        ret_value = H5_add_exit(&H5T_term_interface);
    }
    /*
     * Initialize pre-defined data types that depend on the architecture.
     */
    ret_value = H5T_init();

    /*
     * Initialize pre-define data types that can be derived from
     * architecture-dependent types.
     */

    /* INT8 */
    H5T_NATIVE_INT8_g = H5Tcopy(H5T_NATIVE_INT_g);
    H5Tset_size(H5T_NATIVE_INT8_g, 1);
    H5Tset_precision(H5T_NATIVE_INT8_g, 8);
    H5Tlock(H5T_NATIVE_INT8_g);

    /* UINT8 */
    H5T_NATIVE_UINT8_g = H5Tcopy(H5T_NATIVE_UINT_g);
    H5Tset_size(H5T_NATIVE_UINT8_g, 1);
    H5Tset_precision(H5T_NATIVE_UINT8_g, 8);
    H5Tlock(H5T_NATIVE_UINT8_g);

    /* INT16 */
    H5T_NATIVE_INT16_g = H5Tcopy(H5T_NATIVE_INT_g);
    H5Tset_size(H5T_NATIVE_INT16_g, 2);
    H5Tset_precision(H5T_NATIVE_INT16_g, 16);
    H5Tlock(H5T_NATIVE_INT16_g);

    /* UINT16 */
    H5T_NATIVE_UINT16_g = H5Tcopy(H5T_NATIVE_UINT_g);
    H5Tset_size(H5T_NATIVE_UINT16_g, 2);
    H5Tset_precision(H5T_NATIVE_UINT16_g, 16);
    H5Tlock(H5T_NATIVE_UINT16_g);

    /* INT32 */
    H5T_NATIVE_INT32_g = H5Tcopy(H5T_NATIVE_INT_g);
    H5Tset_size(H5T_NATIVE_INT32_g, 4);
    H5Tset_precision(H5T_NATIVE_INT32_g, 32);
    H5Tlock(H5T_NATIVE_INT32_g);

    /* UINT32 */
    H5T_NATIVE_UINT32_g = H5Tcopy(H5T_NATIVE_UINT_g);
    H5Tset_size(H5T_NATIVE_UINT32_g, 4);
    H5Tset_precision(H5T_NATIVE_UINT32_g, 32);
    H5Tlock(H5T_NATIVE_UINT32_g);

    /* INT64 */
    H5T_NATIVE_INT64_g = H5Tcopy(H5T_NATIVE_INT_g);
    H5Tset_size(H5T_NATIVE_INT64_g, 8);
    H5Tset_precision(H5T_NATIVE_INT64_g, 64);
    H5Tlock(H5T_NATIVE_INT64_g);

    /* UINT64 */
    H5T_NATIVE_UINT64_g = H5Tcopy(H5T_NATIVE_UINT_g);
    H5Tset_size(H5T_NATIVE_UINT64_g, 8);
    H5Tset_precision(H5T_NATIVE_UINT64_g, 64);
    H5Tlock(H5T_NATIVE_UINT64_g);

    /*
     * Initialize pre-defined data types that don't depend on architecture.
     */

    /* TIME */
    dt = H5MM_xcalloc(1, sizeof(H5T_t));
    dt->locked = TRUE;
    dt->type = H5T_TIME;
    dt->size = 1;
    dt->u.atomic.order = H5Tget_order(H5T_NATIVE_INT_g);
    dt->u.atomic.offset = 0;
    dt->u.atomic.prec = 8 * dt->size;
    dt->u.atomic.lsb_pad = H5T_PAD_ZERO;
    dt->u.atomic.msb_pad = H5T_PAD_ZERO;
    if ((H5T_NATIVE_TIME_g = H5A_register(H5_DATATYPE, dt)) < 0) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL,
                      "can't initialize H5T layer");
    }
    /* STRING */
    dt = H5MM_xcalloc(1, sizeof(H5T_t));
    dt->locked = TRUE;
    dt->type = H5T_STRING;
    dt->size = 1;
    dt->u.atomic.order = H5T_ORDER_NONE;
    dt->u.atomic.offset = 0;
    dt->u.atomic.prec = 8 * dt->size;
    dt->u.atomic.lsb_pad = H5T_PAD_ZERO;
    dt->u.atomic.msb_pad = H5T_PAD_ZERO;
    dt->u.atomic.u.s.cset = H5T_CSET_ASCII;
    dt->u.atomic.u.s.pad = H5T_STR_NULL;
    if ((H5T_NATIVE_STRING_g = H5A_register(H5_DATATYPE, dt)) < 0) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL,
                      "can't initialize H5T layer");
    }
    /* BITFIELD */
    dt = H5MM_xcalloc(1, sizeof(H5T_t));
    dt->locked = TRUE;
    dt->type = H5T_BITFIELD;
    dt->size = 1;
    dt->u.atomic.order = H5Tget_order(H5T_NATIVE_INT_g);
    dt->u.atomic.offset = 0;
    dt->u.atomic.prec = 8 * dt->size;
    dt->u.atomic.lsb_pad = H5T_PAD_ZERO;
    dt->u.atomic.msb_pad = H5T_PAD_ZERO;
    if ((H5T_NATIVE_BITFIELD_g = H5A_register(H5_DATATYPE, dt)) < 0) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL,
                      "unable to initialize H5T layer");
    }
    /* OPAQUE */
    dt = H5MM_xcalloc(1, sizeof(H5T_t));
    dt->locked = TRUE;
    dt->type = H5T_OPAQUE;
    dt->size = 1;
    dt->u.atomic.order = H5T_ORDER_NONE;
    dt->u.atomic.offset = 0;
    dt->u.atomic.prec = 8 * dt->size;
    dt->u.atomic.lsb_pad = H5T_PAD_ZERO;
    dt->u.atomic.msb_pad = H5T_PAD_ZERO;
    if ((H5T_NATIVE_OPAQUE_g = H5A_register(H5_DATATYPE, dt)) < 0) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL,
                      "unable to initialize H5T layer");
    }
    /*
     * Define aliases.
     */
    H5T_NATIVE_HYPER_g = H5Tcopy(H5T_NATIVE_LLONG_g);
    H5Tlock(H5T_NATIVE_HYPER_g);

    H5T_NATIVE_UHYPER_g = H5Tcopy(H5T_NATIVE_ULLONG_g);
    H5Tlock(H5T_NATIVE_UHYPER_g);

    /*
     * Register conversion functions beginning with the most general and
     * ending with the most specific.
     */

    if (H5Tregister_soft(H5T_INTEGER, H5T_INTEGER, H5T_conv_order) < 0) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL,
                      "unable to register conversion function");
    }
    if (H5Tregister_soft(H5T_FLOAT, H5T_FLOAT, H5T_conv_order) < 0) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL,
                      "unable to register conversion function");
    }
    FUNC_LEAVE(ret_value);
}

/*--------------------------------------------------------------------------
 NAME
    H5T_term_interface
 PURPOSE
    Terminate various H5T objects
 USAGE
    void H5T_term_interface()
 RETURNS
    SUCCEED/FAIL
 DESCRIPTION
    Release the atom group and any other resources allocated.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
     Can't report errors...
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
static void
H5T_term_interface(void)
{
    H5A_destroy_group(H5_DATATYPE);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tcreate
 *
 * Purpose:     Create a new type and initialize it to reasonable values.
 *              The type is a member of type class TYPE and is SIZE bytes.
 *
 * Return:      Success:        A new type identifier.
 *
 *              Failure:        FAIL
 *
 * Errors:
 *              ARGS      BADVALUE      Invalid size. 
 *              DATATYPE  CANTINIT      Can't create type. 
 *              DATATYPE  CANTREGISTER  Can't register data type atom. 
 *
 * Programmer:  Robb Matzke
 *              Friday, December  5, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Tcreate(H5T_class_t type, size_t size)
{
    H5T_t                  *dt = NULL;
    hid_t                   ret_value = FAIL;

    FUNC_ENTER(H5Tcreate, FAIL);

    /* check args */
    if (size <= 0) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid size");
    }
    /* create the type */
    if (NULL == (dt = H5T_create(type, size))) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "can't create type");
    }
    /* Make it an atom */
    if ((ret_value = H5A_register(H5_DATATYPE, dt)) < 0) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL,
                      "can't register data type atom");
    }
    FUNC_LEAVE(ret_value);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tcopy
 *
 * Purpose:     Copies a data type.  The resulting data type is not locked.
 *              The data type should be closed when no longer needed by
 *              calling H5Tclose().
 *
 * Return:      Success:        The ID of a new data type.
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Tuesday, December  9, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Tcopy(hid_t type_id)
{
    H5T_t                  *dt = NULL;
    H5T_t                  *new_dt = NULL;
    hid_t                   ret_value = FAIL;

    FUNC_ENTER(H5Tcopy, FAIL);
    H5ECLEAR;

    /* check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    }
    /* copy */
    if (NULL == (new_dt = H5T_copy(dt))) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "can't copy");
    }
    /* atomize result */
    if ((ret_value = H5A_register(H5_DATATYPE, new_dt)) < 0) {
        H5T_close(new_dt);
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL,
                      "can't register data type atom");
    }
    FUNC_LEAVE(ret_value);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tclose
 *
 * Purpose:     Frees a data type and all associated memory.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Tuesday, December  9, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tclose(hid_t type_id)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tclose, FAIL);
    H5ECLEAR;

    /* check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    }
    if (dt->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "predefined data type");
    }
    /* When the reference count reaches zero the resources are freed */
    if (H5A_dec_ref(type_id) < 0) {
        HRETURN_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "problem freeing id");
    }
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tequal
 *
 * Purpose:     Determines if two data types are equal.
 *
 * Return:      Success:        TRUE if equal, FALSE if unequal
 *
 *              Failure:        FAIL
 *
 * Errors:
 *
 * Programmer:  Robb Matzke
 *              Wednesday, December 10, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hbool_t
H5Tequal(hid_t type1_id, hid_t type2_id)
{
    const H5T_t            *dt1 = NULL;
    const H5T_t            *dt2 = NULL;
    hbool_t                 ret_value = FAIL;

    FUNC_ENTER(H5Tequal, FAIL);

    /* check args */
    if (H5_DATATYPE != H5A_group(type1_id) ||
        NULL == (dt1 = H5A_object(type1_id)) ||
        H5_DATATYPE != H5A_group(type2_id) ||
        NULL == (dt2 = H5A_object(type2_id))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    }
    ret_value = (0 == H5T_cmp(dt1, dt2));

    FUNC_LEAVE(ret_value);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tlock
 *
 * Purpose:     Locks a type, making it read only and non-destructable.  This
 *              is normally done by the library for predefined data types so
 *              the application doesn't inadvertently change or delete a
 *              predefined type.
 *
 *              Once a data type is locked it can never be unlocked.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Friday, January  9, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tlock(hid_t type_id)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tlock, FAIL);

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    }
    dt->locked = TRUE;
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_class
 *
 * Purpose:     Returns the data type class identifier for data type TYPE_ID.
 *
 * Return:      Success:        One of the non-negative data type class
 *                              constants.
 *
 *              Failure:        H5T_NO_CLASS (-1, same as FAIL)
 *
 * Programmer:  Robb Matzke
 *              Monday, December  8, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_class_t
H5Tget_class(hid_t type_id)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tget_class, H5T_NO_CLASS);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, H5T_NO_CLASS, "not a data type");
    }
    FUNC_LEAVE(dt->type);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_size
 *
 * Purpose:     Determines the total size of a data type in bytes.
 *
 * Return:      Success:        Size of the data type in bytes.  The size of
 *                              data type is the size of an instance of that
 *                              data type.
 *
 *              Failure:        0 (valid data types are never zero size)
 *
 * Programmer:  Robb Matzke
 *              Monday, December  8, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
size_t
H5Tget_size(hid_t type_id)
{
    H5T_t                  *dt = NULL;
    size_t                  size;

    FUNC_ENTER(H5Tget_size, 0);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not a data type");
    }
    /* size */
    size = H5T_get_size(dt);

    FUNC_LEAVE(size);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tset_size
 *
 * Purpose:     Sets the total size in bytes for an atomic data type (this
 *              operation is not permitted on compound data types).  If the
 *              size is decreased so that the significant bits of the data
 *              type extend beyond the edge of the new size, then the
 *              `offset' property is decreased toward zero.  If the `offset'
 *              becomes zero and the significant bits of the data type still
 *              hang over the edge of the new size, then the number of
 *              significant bits is decreased.
 *
 *              Adjusting the size of an H5T_STRING automatically sets the
 *              precision to 8*size.
 *
 *              All data types have a positive size.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_size(hid_t type_id, size_t size)
{
    H5T_t                  *dt = NULL;
    size_t                  prec, offset;

    FUNC_ENTER(H5Tset_size, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        !H5T_is_atomic(dt)) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an atomic data type");
    }
    if (dt->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
    }
    if (size <= 0) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "size must be positive");
    }
    offset = dt->u.atomic.offset;
    prec = dt->u.atomic.prec;

    /* Decrement the offset and precision if necessary */
    if (prec > 8 * size)
        offset = 0;
    else if (offset + prec > 8 * size)
        offset = 8 * size - prec;
    if (prec > 8 * size)
        prec = 8 * size;

    /* Make sure that other values are still okay */
    switch (dt->type) {
    case H5T_INTEGER:
    case H5T_TIME:
    case H5T_BITFIELD:
        /* nothing to check */
        break;

    case H5T_STRING:
        prec = 8 * size;
        offset = 0;
        break;

    case H5T_FLOAT:
        /*
         * The sign, mantissa, and exponent fields should be adjusted first
         * when decreasing the size of a floating point type.
         */
        if (dt->u.atomic.u.f.sign >= prec ||
            dt->u.atomic.u.f.epos + dt->u.atomic.u.f.esize > prec ||
            dt->u.atomic.u.f.mpos + dt->u.atomic.u.f.msize > prec) {
            HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                        "adjust sign, mantissa, and exponent fields first");
        }
        break;

    case H5T_OPAQUE:
        /*
         * The significant bits of an opaque type are not allowed to change
         * implicitly.
         */
        if (prec != dt->u.atomic.prec) {
            HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                          "unable to change precision of an opaque type");
        }
        break;

    default:
        assert("not implemented yet" && 0);
    }

    /* Commit */
    dt->size = size;
    dt->u.atomic.offset = offset;
    dt->u.atomic.prec = prec;

    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_order
 *
 * Purpose:     Returns the byte order of an atomic data type.
 *
 * Return:      Success:        A byte order constant
 *
 *              Failure:        H5T_ORDER_ERROR (-1, same as FAIL)
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_order_t
H5Tget_order(hid_t type_id)
{
    H5T_t                  *dt = NULL;
    H5T_order_t             order;

    FUNC_ENTER(H5Tget_order, H5T_ORDER_ERROR);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        !H5T_is_atomic(dt)) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, H5T_ORDER_ERROR,
                      "not an atomic data type");
    }
    /* order */
    order = dt->u.atomic.order;

    FUNC_LEAVE(order);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tset_order
 *
 * Purpose:     Sets the byte order for an atomic data type.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_order(hid_t type_id, H5T_order_t order)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tset_order, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        !H5T_is_atomic(dt)) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an atomic data type");
    }
    if (dt->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
    }
    if (order < 0 || order > H5T_ORDER_NONE) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "illegal byte order");
    }
    /* order */
    dt->u.atomic.order = order;
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_precision
 *
 * Purpose:     Gets the precision of an atomic data type.  The precision is
 *              the number of significant bits which, unless padding is
 *              present, is 8 times larger than the value returned by
 *              H5Tget_size().
 *
 * Return:      Success:        Number of significant bits
 *
 *              Failure:        0 (all atomic types have at least one
 *                              significant bit)
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
size_t
H5Tget_precision(hid_t type_id)
{
    H5T_t                  *dt = NULL;
    size_t                  prec;

    FUNC_ENTER(H5Tget_precision, 0);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        !H5T_is_atomic(dt)) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not an atomic data type");
    }
    /* precision */
    prec = dt->u.atomic.prec;

    FUNC_LEAVE(prec);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tset_precision
 *
 * Purpose:     Sets the precision of an atomic data type.  The precision is
 *              the number of significant bits which, unless padding is
 *              present, is 8 times larger than the value returned by
 *              H5Tget_size().
 *
 *              If the precision is increased then the offset is decreased
 *              and then the size is increased to insure that significant
 *              bits do not "hang over" the edge of the data type.
 *
 *              Changing the precision of an H5T_STRING automatically changes
 *              the size as well.  The precision must be a multiple of 8.
 *
 *              When decreasing the precision of a floating point type, set
 *              the locations and sizes of the sign, mantissa, and exponent
 *              fields first.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_precision(hid_t type_id, size_t prec)
{
    H5T_t                  *dt = NULL;
    size_t                  offset, size;

    FUNC_ENTER(H5Tset_prec, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        !H5T_is_atomic(dt)) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an atomic data type");
    }
    if (dt->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
    }
    if (prec <= 0) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                      "precision must be positive");
    }
    /* Adjust the offset and size */
    offset = dt->u.atomic.offset;
    size = dt->size;
    if (prec > 8 * size)
        offset = 0;
    else if (offset + prec > 8 * size)
        offset = 8 * size - prec;
    if (prec > 8 * size)
        size = (prec + 7) / 8;

    /* Check that things are still kosher */
    switch (dt->type) {
    case H5T_INTEGER:
    case H5T_TIME:
    case H5T_BITFIELD:
    case H5T_OPAQUE:
        /* nothing to check */
        break;

    case H5T_STRING:
        if (prec % 8) {
            HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                          "precision for this type must be a multiple of 8");
        }
        offset = 0;
        size = prec / 8;
        break;

    case H5T_FLOAT:
        /*
         * The sign, mantissa, and exponent fields should be adjusted first
         * when decreasing the precision of a floating point type.
         */
        if (dt->u.atomic.u.f.sign >= prec ||
            dt->u.atomic.u.f.epos + dt->u.atomic.u.f.esize > prec ||
            dt->u.atomic.u.f.mpos + dt->u.atomic.u.f.msize > prec) {
            HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                        "adjust sign, mantissa, and exponent fields first");
        }
        break;

    default:
        assert("not implemented yet" && 0);
    }

    /* Commit */
    dt->size = size;
    dt->u.atomic.offset = offset;
    dt->u.atomic.prec = prec;

    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_offset
 *
 * Purpose:     Retrieves the bit offset of the first significant bit.  The
 *              signficant bits of an atomic datum can be offset from the
 *              beginning of the memory for that datum by an amount of
 *              padding. The `offset' property specifies the number of bits
 *              of padding that appear to the "right of" the value.  That is,
 *              if we have a 32-bit datum with 16-bits of precision having
 *              the value 0x1122 then it will be layed out in memory as (from
 *              small byte address toward larger byte addresses):
 *
 *                  Big      Big       Little   Little
 *                  Endian   Endian    Endian   Endian
 *                  offset=0 offset=16 offset=0 offset=16
 *
 *              0:  [ pad]   [0x11]    [0x22]   [ pad]
 *              1:  [ pad]   [0x22]    [0x11]   [ pad]
 *              2:  [0x11]   [ pad]    [ pad]   [0x22]
 *              3:  [0x22]   [ pad]    [ pad]   [0x11]
 *
 * Return:      Success:        The offset
 *
 *              Failure:        0
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
size_t
H5Tget_offset(hid_t type_id)
{
    H5T_t                  *dt = NULL;
    size_t                  offset;

    FUNC_ENTER(H5Tget_offset, 0);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        !H5T_is_atomic(dt)) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not an atomic data type");
    }
    /* offset */
    offset = dt->u.atomic.offset;

    FUNC_LEAVE(offset);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tset_offset
 *
 * Purpose:     Sets the bit offset of the first significant bit.  The
 *              signficant bits of an atomic datum can be offset from the
 *              beginning of the memory for that datum by an amount of
 *              padding. The `offset' property specifies the number of bits
 *              of padding that appear to the "right of" the value.  That is,
 *              if we have a 32-bit datum with 16-bits of precision having
 *              the value 0x1122 then it will be layed out in memory as (from
 *              small byte address toward larger byte addresses):
 *
 *                  Big      Big       Little   Little
 *                  Endian   Endian    Endian   Endian
 *                  offset=0 offset=16 offset=0 offset=16
 *
 *              0:  [ pad]   [0x11]    [0x22]   [ pad]
 *              1:  [ pad]   [0x22]    [0x11]   [ pad]
 *              2:  [0x11]   [ pad]    [ pad]   [0x22]
 *              3:  [0x22]   [ pad]    [ pad]   [0x11]
 *
 *              If the offset is incremented then the total size is
 *              incremented also if necessary to prevent significant bits of
 *              the value from hanging over the edge of the data type.
 *
 *              The offset of an H5T_STRING cannot be set to anything but
 *              zero. 
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_offset(hid_t type_id, size_t offset)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tset_offset, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        !H5T_is_atomic(dt)) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an atomic data type");
    }
    if (dt->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
    }
    if (H5T_STRING == dt->type && offset != 0) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                      "offset must be zero for this type");
    }
    /* Adjust the size */
    if (offset + dt->u.atomic.prec > 8 * dt->size) {
        dt->size = (offset + dt->u.atomic.prec + 7) / 8;
    }
    /* Commit */
    dt->u.atomic.offset = offset;

    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_pad
 *
 * Purpose:     Gets the least significant pad type and the most significant
 *              pad type and returns their values through the LSB and MSB
 *              arguments, either of which may be the null pointer.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Friday, January  9, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tget_pad(hid_t type_id, H5T_pad_t *lsb /*out */ , H5T_pad_t *msb /*out */ )
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tget_pad, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        !H5T_is_atomic(dt)) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an atomic data type");
    }
    /* Get values */
    if (lsb)
        *lsb = dt->u.atomic.lsb_pad;
    if (msb)
        *msb = dt->u.atomic.msb_pad;

    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tset_pad
 *
 * Purpose:     Sets the LSB and MSB pad types.
 *
 * Return:      Success:        
 *
 *              Failure:        
 *
 * Programmer:  Robb Matzke
 *              Friday, January  9, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_pad(hid_t type_id, H5T_pad_t lsb, H5T_pad_t msb)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tset_pad, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        !H5T_is_atomic(dt)) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an atomic data type");
    }
    if (dt->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
    }
    if (lsb < 0 || lsb >= H5T_NPAD || msb < 0 || msb >= H5T_NPAD) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid pad type");
    }
    dt->u.atomic.lsb_pad = lsb;
    dt->u.atomic.msb_pad = msb;

    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_sign
 *
 * Purpose:     Retrieves the sign type for an integer type.
 *
 * Return:      Success:        The sign type.
 *
 *              Failure:        H5T_SGN_ERROR (-1, same as FAIL)
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_sign_t
H5Tget_sign(hid_t type_id)
{
    H5T_t                  *dt = NULL;
    H5T_sign_t              sign;

    FUNC_ENTER(H5Tget_sign, H5T_SGN_ERROR);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_INTEGER != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, H5T_SGN_ERROR,
                      "not an integer data type");
    }
    /* sign */
    sign = dt->u.atomic.u.i.sign;

    FUNC_LEAVE(sign);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tset_sign
 *
 * Purpose:     Sets the sign property for an integer.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_sign(hid_t type_id, H5T_sign_t sign)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tset_sign, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_INTEGER != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an integer data type");
    }
    if (dt->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
    }
    if (sign < 0 || sign >= H5T_NSGN) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "illegal sign type");
    }
    /* sign */
    dt->u.atomic.u.i.sign = sign;
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_fields
 *
 * Purpose:     Returns information about the locations of the various bit
 *              fields of a floating point data type.  The field positions
 *              are bit positions in the significant region of the data type.
 *              Bits are numbered with the least significant bit number zero.
 *
 *              Any (or even all) of the arguments can be null pointers.
 *
 * Return:      Success:        SUCCEED, field locations and sizes are
 *                              returned through the arguments.
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tget_fields(hid_t type_id, size_t *spos /*out */ ,
              size_t *epos /*out */ , size_t *esize /*out */ ,
              size_t *mpos /*out */ , size_t *msize /*out */ )
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tget_fields, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_FLOAT != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL,
                      "not a floating-point data type");
    }
    /* Get values */
    if (spos)
        *spos = dt->u.atomic.u.f.sign;
    if (epos)
        *epos = dt->u.atomic.u.f.epos;
    if (esize)
        *esize = dt->u.atomic.u.f.esize;
    if (mpos)
        *mpos = dt->u.atomic.u.f.mpos;
    if (msize)
        *msize = dt->u.atomic.u.f.msize;

    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tset_fields
 *
 * Purpose:     Sets the locations and sizes of the various floating point
 *              bit fields.  The field positions are bit positions in the
 *              significant region of the data type.  Bits are numbered with
 *              the least significant bit number zero.
 *
 *              Fields are not allowed to extend beyond the number of bits of
 *              precision, nor are they allowed to overlap with one another.
 *              
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_fields(hid_t type_id, size_t spos, size_t epos, size_t esize,
              size_t mpos, size_t msize)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tset_fields, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_FLOAT != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL,
                      "not a floating-point data type");
    }
    if (dt->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
    }
    if (epos < 0 || epos + esize > dt->u.atomic.prec) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                      "exponent bit field size/location is invalid");
    }
    if (mpos < 0 || mpos + msize > dt->u.atomic.prec) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                      "mantissa bit field size/location is invalid");
    }
    if (spos < 0 || spos >= dt->u.atomic.prec) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                      "sign location is not valid");
    }
    /* Check for overlap */
    if (spos >= epos && spos < epos + esize) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                      "sign bit appears within exponent field");
    }
    if (spos >= mpos && spos < mpos + msize) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                      "sign bit appears within mantissa field");
    }
    if ((mpos < epos && mpos + msize > epos) ||
        (epos < mpos && epos + esize > mpos)) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                      "exponent and mantissa fields overlap");
    }
    /* Commit */
    dt->u.atomic.u.f.sign = spos;
    dt->u.atomic.u.f.epos = epos;
    dt->u.atomic.u.f.mpos = mpos;
    dt->u.atomic.u.f.esize = esize;
    dt->u.atomic.u.f.msize = msize;

    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_ebias
 *
 * Purpose:     Retrieves the exponent bias of a floating-point type.
 *
 * Return:      Success:        The bias
 *
 *              Failure:        0
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
size_t
H5Tget_ebias(hid_t type_id)
{
    H5T_t                  *dt = NULL;
    size_t                  ebias;

    FUNC_ENTER(H5Tget_ebias, 0);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_FLOAT != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, 0,
                      "not a floating-point data type");
    }
    /* bias */
    ebias = dt->u.atomic.u.f.ebias;

    FUNC_LEAVE(ebias);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tset_ebias
 *
 * Purpose:     Sets the exponent bias of a floating-point type.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_ebias(hid_t type_id, size_t ebias)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tset_ebias, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_FLOAT != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL,
                      "not a floating-point data type");
    }
    if (dt->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
    }
    dt->u.atomic.u.f.ebias = ebias;

    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_norm
 *
 * Purpose:     Returns the mantisssa normalization of a floating-point data
 *              type.
 *
 * Return:      Success:        Normalization ID
 *
 *              Failure:        H5T_NORM_ERROR (-1, same as FAIL)
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_norm_t
H5Tget_norm(hid_t type_id)
{
    H5T_t                  *dt = NULL;
    H5T_norm_t              norm;

    FUNC_ENTER(H5Tget_norm, H5T_NORM_ERROR);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_FLOAT != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, H5T_NORM_ERROR,
                      "not a floating-point data type");
    }
    /* norm */
    norm = dt->u.atomic.u.f.norm;

    FUNC_LEAVE(norm);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tset_norm
 *
 * Purpose:     Sets the mantissa normalization method for a floating point
 *              data type.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_norm(hid_t type_id, H5T_norm_t norm)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tset_norm, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_FLOAT != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL,
                      "not a floating-point data type");
    }
    if (dt->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
    }
    if (norm < 0 || norm > H5T_NORM_NONE) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "illegal normalization");
    }
    /* norm */
    dt->u.atomic.u.f.norm = norm;
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_inpad
 *
 * Purpose:     If any internal bits of a floating point type are unused
 *              (that is, those significant bits which are not part of the
 *              sign, exponent, or mantissa) then they will be filled
 *              according to the value of this property.
 *
 * Return:      Success:        The internal padding type.
 *
 *              Failure:        H5T_PAD_ERROR (-1, same as FAIL)
 *
 * Programmer:  Robb Matzke
 *              Friday, January  9, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_pad_t
H5Tget_inpad(hid_t type_id)
{
    H5T_t                  *dt = NULL;
    H5T_pad_t               pad;

    FUNC_ENTER(H5Tget_inpad, H5T_PAD_ERROR);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_FLOAT != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, H5T_PAD_ERROR,
                      "not a floating-point data type");
    }
    /* pad */
    pad = dt->u.atomic.u.f.pad;

    FUNC_LEAVE(pad);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tset_inpad
 *
 * Purpose:     If any internal bits of a floating point type are unused
 *              (that is, those significant bits which are not part of the
 *              sign, exponent, or mantissa) then they will be filled
 *              according to the value of this property.
 *
 * Return:      Success:        
 *
 *              Failure:        
 *
 * Programmer:  Robb Matzke
 *              Friday, January  9, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_inpad(hid_t type_id, H5T_pad_t pad)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tset_inpad, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_FLOAT != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL,
                      "not a floating-point data type");
    }
    if (dt->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
    }
    if (pad < 0 || pad >= H5T_NPAD) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                      "illegal internal pad type");
    }
    /* pad */
    dt->u.atomic.u.f.pad = pad;
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_cset
 *
 * Purpose:     HDF5 is able to distinguish between character sets of
 *              different nationalities and to convert between them to the
 *              extent possible.
 *              
 * Return:      Success:        The character set of an H5T_STRING type.
 *
 *              Failure:        H5T_CSET_ERROR (-1, same as FAIL)
 *
 * Programmer:  Robb Matzke
 *              Friday, January  9, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_cset_t
H5Tget_cset(hid_t type_id)
{
    H5T_t                  *dt = NULL;
    H5T_cset_t              cset;

    FUNC_ENTER(H5Tget_cset, H5T_CSET_ERROR);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_STRING != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, H5T_CSET_ERROR,
                      "not a string data type");
    }
    /* result */
    cset = dt->u.atomic.u.s.cset;

    FUNC_LEAVE(cset);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tset_cset
 *
 * Purpose:     HDF5 is able to distinguish between character sets of
 *              different nationalities and to convert between them to the
 *              extent possible.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Friday, January  9, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_cset(hid_t type_id, H5T_cset_t cset)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tset_cset, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_STRING != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a string data type");
    }
    if (dt->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
    }
    if (cset < 0 || cset >= H5T_NCSET) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                      "illegal character set type");
    }
    /* set */
    dt->u.atomic.u.s.cset = cset;
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_strpad
 *
 * Purpose:     The method used to store character strings differs with the
 *              programming language: C usually null terminates strings while
 *              Fortran left-justifies and space-pads strings.  This property
 *              defines the storage mechanism for the string.
 *              
 * Return:      Success:        The character set of an H5T_STRING type.
 *
 *              Failure:        H5T_STR_ERROR (-1, same as FAIL)
 *
 * Programmer:  Robb Matzke
 *              Friday, January  9, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_str_t
H5Tget_strpad(hid_t type_id)
{
    H5T_t                  *dt = NULL;
    H5T_str_t               strpad;

    FUNC_ENTER(H5Tget_strpad, H5T_STR_ERROR);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_STRING != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, H5T_STR_ERROR,
                      "not a string data type");
    }
    /* result */
    strpad = dt->u.atomic.u.s.pad;

    FUNC_LEAVE(strpad);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tset_strpad
 *
 * Purpose:     The method used to store character strings differs with the
 *              programming language: C usually null terminates strings while
 *              Fortran left-justifies and space-pads strings.  This property
 *              defines the storage mechanism for the string.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Friday, January  9, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tset_strpad(hid_t type_id, H5T_str_t strpad)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tset_strpad, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_STRING != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a string data type");
    }
    if (dt->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
    }
    if (strpad < 0 || strpad >= H5T_NSTR) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "illegal string pad type");
    }
    /* set */
    dt->u.atomic.u.s.pad = strpad;
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_nmembers
 *
 * Purpose:     Determines how many members compound data type TYPE_ID has.
 *
 * Return:      Success:        Number of members defined in a compound data
 *                              type.
 *
 *              Failure:        FAIL
 *
 * Errors:
 *
 * Programmer:  Robb Matzke
 *              Monday, December  8, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
intn
H5Tget_nmembers(hid_t type_id)
{

    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tget_num_members, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_COMPOUND != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a compound data type");
    }
    FUNC_LEAVE(dt->u.compnd.nmembs);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_member_name
 *
 * Purpose:     Returns the name of a member of a compound data type.
 *              Members are stored in no particular order with numbers 0
 *              through N-1 where N is the value returned by
 *              H5Tget_nmembers().
 *
 * Return:      Success:        Ptr to a string allocated with malloc().  The
 *                              caller is responsible for freeing the string.
 *
 *              Failure:        NULL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
char                   *
H5Tget_member_name(hid_t type_id, int membno)
{
    H5T_t                  *dt = NULL;
    char                   *s = NULL;

    FUNC_ENTER(H5Tget_member_name, NULL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_COMPOUND != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a compound data type");
    }
    if (membno < 0 || membno >= dt->u.compnd.nmembs) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "invalid member number");
    }
    s = H5MM_xstrdup(dt->u.compnd.memb[membno].name);
    FUNC_LEAVE(s);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_member_offset
 *
 * Purpose:     Returns the byte offset of the beginning of a member with
 *              respect to the beginning of the compound data type datum.
 *
 * Return:      Success:        Byte offset.
 *
 *              Failure:        Zero. Zero is a valid offset, but this
 *                              function will fail only if a call to
 *                              H5Tget_member_dims() fails with the same
 *                              arguments.
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
size_t
H5Tget_member_offset(hid_t type_id, int membno)
{
    H5T_t                  *dt = NULL;
    size_t                  offset = 0;

    FUNC_ENTER(H5Tget_member_offset, 0);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_COMPOUND != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not a compound data type");
    }
    if (membno < 0 || membno >= dt->u.compnd.nmembs) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, 0, "invalid member number");
    }
    offset = dt->u.compnd.memb[membno].offset;
    FUNC_LEAVE(offset);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_member_dims
 *
 * Purpose:     Returns the dimensionality of the member.  The dimensions and
 *              permuation vector are returned through arguments DIMS and
 *              PERM, both arrays of at least four elements.  Either (or even
 *              both) may be null pointers.
 *
 * Return:      Success:        A value between zero and four, inclusive.
 *
 *              Failure:        -1
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
int
H5Tget_member_dims(hid_t type_id, int membno,
                   int dims[] /*out */ , int perm[] /*out */ )
{
    H5T_t                  *dt = NULL;
    intn                    ndims, i;

    FUNC_ENTER(H5Tget_member_dims, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_COMPOUND != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a compound data type");
    }
    if (membno < 0 || membno >= dt->u.compnd.nmembs) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid member number");
    }
    ndims = dt->u.compnd.memb[membno].ndims;
    for (i = 0; i < ndims; i++) {
        if (dims[i])
            dims[i] = dt->u.compnd.memb[membno].dim[i];
        if (perm[i])
            perm[i] = dt->u.compnd.memb[membno].perm[i];
    }

    FUNC_LEAVE(ndims);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tget_member_type
 *
 * Purpose:     Returns the data type of the specified member.  The caller
 *              should invoke H5Tclose() to release resources associated with
 *              the type.
 *
 * Return:      Success:        An OID of a copy of the member data type;
 *                              modifying the returned data type does not
 *                              modify the member type.
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Tget_member_type(hid_t type_id, int membno)
{
    H5T_t                  *dt = NULL, *memb_dt = NULL;
    hid_t                   memb_type_id;

    FUNC_ENTER(H5Tget_member_type, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_COMPOUND != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a compound data type");
    }
    if (membno < 0 || membno >= dt->u.compnd.nmembs) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid member number");
    }
    /* Copy data type into an atom */
    if (NULL == (memb_dt = H5T_copy(&(dt->u.compnd.memb[membno].type)))) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL,
                      "unable to copy member data type");
    }
    if ((memb_type_id = H5A_register(H5_DATATYPE, memb_dt)) < 0) {
        H5T_close(memb_dt);
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL,
                      "can't register data type atom");
    }
    FUNC_LEAVE(memb_type_id);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tinsert
 *
 * Purpose:     Adds another member to the compound data type PARENT_ID.  The
 *              new member has a NAME which must be unique within the
 *              compound data type. The OFFSET argument defines the start of
 *              the member in an instance of the compound data type, and
 *              MEMBER_ID is the type of the new member.
 *
 * Note:        All members of a compound data type must be atomic; a
 *              compound data type cannot have a member which is a compound
 *              data type.
 *
 * Return:      Success:        SUCCEED, the PARENT_ID compound data type is
 *                              modified to include a copy of the member type
 *                              MEMBER_ID.
 *
 *              Failure:        FAIL
 *
 * Errors:
 *
 * Programmer:  Robb Matzke
 *              Monday, December  8, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tinsert(hid_t parent_id, const char *name, off_t offset, hid_t member_id)
{
    H5T_t                  *parent = NULL;      /*the compound parent data type */
    H5T_t                  *member = NULL;      /*the atomic member type        */

    FUNC_ENTER(H5Tinsert, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(parent_id) ||
        NULL == (parent = H5A_object(parent_id)) ||
        H5T_COMPOUND != parent->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a compound data type");
    }
    if (parent->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "parent type read-only");
    }
    if (!name || !*name) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no member name");
    }
    if (H5_DATATYPE != H5A_group(member_id) ||
        NULL == (member = H5A_object(member_id))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    }
    if (H5T_insert(parent, name, offset, member) < 0) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINSERT, FAIL,
                      "can't insert member");
    }
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tpack
 *
 * Purpose:     Recursively removes padding from within a compound data type
 *              to make it more efficient (space-wise) to store that data.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tpack(hid_t type_id)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5Tpack, FAIL);
    H5ECLEAR;

    /* Check args */
    if (H5_DATATYPE != H5A_group(type_id) ||
        NULL == (dt = H5A_object(type_id)) ||
        H5T_COMPOUND != dt->type) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a compound data type");
    }
    if (dt->locked) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "data type is read-only");
    }
    if (H5T_pack(dt) < 0) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL,
                      "unable to pack compound data type");
    }
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tregister_hard
 *
 * Purpose:     Register a hard conversion function for a data type
 *              conversion path.  The path is specified by the source and
 *              destination data types SRC_ID and DST_ID.  A conversion path
 *              can only have one hard function, so FUNC replaces any
 *              previous hard function.
 *
 *              If FUNC is the null pointer then any hard function registered
 *              for this path is removed from this path.  The soft functions
 *              are then used when determining which conversion function is
 *              appropriate for this path.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Friday, January  9, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tregister_hard(hid_t src_id, hid_t dst_id, H5T_conv_t func)
{
    H5T_t                  *src = NULL;
    H5T_t                  *dst = NULL;
    H5T_path_t             *path = NULL;

    FUNC_ENTER(H5Tregister_hard, FAIL);

    /* Check args */
    if (H5_DATATYPE != H5A_group(src_id) ||
        NULL == (src = H5A_object(src_id)) ||
        H5_DATATYPE != H5A_group(dst_id) ||
        NULL == (dst = H5A_object(dst_id))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
    }
    /* Locate or create a new conversion path */
    if (NULL == (path = H5T_path_find(src, dst, TRUE))) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL,
                      "unable to locate/allocate conversion path");
    }
    /* Initialize the hard function */
    path->hard = func;
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tregister_soft
 *
 * Purpose:     Registers a soft conversion function by adding it to the end
 *              of the master soft list and replacing the soft function in
 *              all applicable existing conversion paths.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Tuesday, January 13, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tregister_soft(H5T_class_t src_cls, H5T_class_t dst_cls, H5T_conv_t func)
{
    intn                    i;
    hid_t                   src_id, dst_id;

    FUNC_ENTER(H5Tregister_soft, FAIL);

    /* Check args */
    if (src_cls < 0 || src_cls >= H5T_NCLASSES ||
        dst_cls < 0 || dst_cls >= H5T_NCLASSES) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                      "illegal source or destination data type class");
    }
    if (!func) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL,
                      "no soft conversion function specified");
    }
    /* Add function to end of master list */
    if (H5T_nsoft_g >= H5T_asoft_g) {
        H5T_asoft_g = MAX(32, 2 * H5T_asoft_g);
        H5T_soft_g = H5MM_xrealloc(H5T_soft_g, H5T_asoft_g * sizeof(H5T_soft_t));
    }
    H5T_soft_g[H5T_nsoft_g].src = src_cls;
    H5T_soft_g[H5T_nsoft_g].dst = dst_cls;
    H5T_soft_g[H5T_nsoft_g].func = func;
    H5T_nsoft_g++;

    /* Replace soft functions of all appropriate paths */
    for (i = 0; i < H5T_npath_g; i++) {
        H5T_path_t             *path = H5T_path_g + i;

        /*
         * Type conversion functions are app-level, so we need to convert the
         * data type temporarily to an object id before we query the functions
         * capabilities.
         */
        if (path->src->type != src_cls || path->dst->type != dst_cls)
            continue;
        if ((src_id = H5A_register(H5_DATATYPE, H5T_copy(path->src))) < 0 ||
        (dst_id = H5A_register(H5_DATATYPE, H5T_copy(path->dst))) < 0) {
            HRETURN_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL,
                          "unable to register data types for conv query");
        }
        if ((func) (src_id, dst_id, 0, NULL, NULL) >= 0) {
            path->soft = func;
        }
        H5A_dec_ref(src_id);
        H5A_dec_ref(dst_id);
        H5ECLEAR;
    }

    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tunregister
 *
 * Purpose:     Removes FUNC from all conversion paths.  If FUNC is
 *              registered as the soft conversion function of a path then it
 *              is replaced with some other soft conversion function from the
 *              master soft list if one applies.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Tuesday, January 13, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Tunregister(H5T_conv_t func)
{
    intn                    i, j;
    H5T_path_t             *path = NULL;
    hid_t                   src_id, dst_id;

    FUNC_ENTER(H5Tunregister, FAIL);

    /* Check args */
    if (!func) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no conversion function");
    }
    /* Remove function from master soft list */
    for (i = H5T_nsoft_g - 1; i >= 0; --i) {
        if (H5T_soft_g[i].func == func) {
            HDmemmove(H5T_soft_g + i, H5T_soft_g + i + 1,
                      (H5T_nsoft_g - (i + 1)) * sizeof(H5T_soft_t));
            --H5T_nsoft_g;
        }
    }

    /* Remove function from all conversion paths */
    for (i = 0; i < H5T_npath_g; i++) {
        path = H5T_path_g + i;

        /* Reset hard function */
        if (path->hard == func) {
            path->hard = NULL;
        }
        /* Reset soft function */
        if (path->soft == func) {
            path->soft = NULL;
            for (j = H5T_nsoft_g - 1; j >= 0 && !path->soft; --j) {
                if (path->src->type != H5T_soft_g[j].src ||
                    path->dst->type != H5T_soft_g[j].dst) {
                    continue;
                }
                /*
                 * Conversion functions are app-level, so temporarily create
                 * object id's for the data types.
                 */
                if ((src_id = H5A_register(H5_DATATYPE,
					   H5T_copy(path->src))) < 0 ||
                    (dst_id = H5A_register(H5_DATATYPE,
					   H5T_copy(path->dst))) < 0) {
                    HRETURN_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL,
                                  "unable to register conv types for query");
                }
                if ((H5T_soft_g[j].func) (src_id, dst_id, 0, NULL, NULL) >= 0) {
                    path->soft = H5T_soft_g[j].func;
                }
                H5A_dec_ref(src_id);
                H5A_dec_ref(dst_id);
                H5ECLEAR;
            }
        }
    }

    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5Tfind
 *
 * Purpose:     Finds a conversion function that can handle a conversion from
 *              type SRC_ID to type DST_ID.
 *
 * Return:      Success:        A pointer to a suitable conversion function.
 *
 *              Failure:        NULL
 *
 * Programmer:  Robb Matzke
 *              Tuesday, January 13, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_conv_t
H5Tfind(hid_t src_id, hid_t dst_id)
{
    H5T_conv_t              ret_value = NULL;
    H5T_t                  *src = NULL, *dst = NULL;

    FUNC_ENTER(H5Tfind, NULL);

    /* Check args */
    if (H5_DATATYPE != H5A_group(src_id) ||
        NULL == (src = H5A_object(src_id)) ||
        H5_DATATYPE != H5A_group(dst_id) ||
        NULL == (dst = H5A_object(dst_id))) {
        HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a data type");
    }
    /* Find it */
    if (NULL == (ret_value = H5T_find(src, dst))) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_NOTFOUND, NULL,
                      "conversion function not found");
    }
    FUNC_LEAVE(ret_value);
}

/*-------------------------------------------------------------------------
 * API functions are above; library-private functions are below...
 *------------------------------------------------------------------------- 
 */

/*-------------------------------------------------------------------------
 * Function:    H5T_create
 *
 * Purpose:     Creates a new data type and initializes it to reasonable
 *              values.  The new data type is SIZE bytes and an instance of
 *              the class TYPE.
 *
 * Return:      Success:        Pointer to the new type.
 *
 *              Failure:        NULL
 *
 * Programmer:  Robb Matzke
 *              Friday, December  5, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_t                  *
H5T_create(H5T_class_t type, size_t size)
{
    H5T_t                  *dt = NULL;

    FUNC_ENTER(H5T_create, NULL);

    assert(size > 0);

    switch (type) {
    case H5T_INTEGER:
    case H5T_FLOAT:
    case H5T_TIME:
    case H5T_STRING:
    case H5T_BITFIELD:
    case H5T_OPAQUE:
        HRETURN_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, NULL,
                      "type class is not appropriate - use H5Tcopy()");

    case H5T_COMPOUND:
        dt = H5MM_xcalloc(1, sizeof(H5T_t));
        dt->type = type;
        break;

    default:
        HRETURN_ERROR(H5E_INTERNAL, H5E_UNSUPPORTED, NULL,
                      "unknown data type class");
    }

    dt->size = size;
    FUNC_LEAVE(dt);
}

/*-------------------------------------------------------------------------
 * Function:    H5T_copy
 *
 * Purpose:     Copies datatype OLD_DT.  The resulting data type is not
 *              locked.
 *
 * Return:      Success:        Pointer to a new copy of the OLD_DT argument.
 *
 *              Failure:        NULL
 *
 * Programmer:  Robb Matzke
 *              Thursday, December  4, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_t                  *
H5T_copy(const H5T_t *old_dt)
{
    H5T_t                  *new_dt = NULL;
    intn                    i;
    char                   *s;

    FUNC_ENTER(H5T_copy, NULL);

    /* check args */
    assert(old_dt);

    /* copy */
    new_dt = H5MM_xcalloc(1, sizeof(H5T_t));
    *new_dt = *old_dt;
    new_dt->locked = FALSE;

    if (H5T_COMPOUND == new_dt->type) {
        new_dt->u.compnd.memb = H5MM_xmalloc(new_dt->u.compnd.nmembs *
                                             sizeof(H5T_member_t));
        HDmemcpy(new_dt->u.compnd.memb, old_dt->u.compnd.memb,
                 new_dt->u.compnd.nmembs * sizeof(H5T_member_t));
        for (i = 0; i < new_dt->u.compnd.nmembs; i++) {
            s = new_dt->u.compnd.memb[i].name;
            new_dt->u.compnd.memb[i].name = H5MM_xstrdup(s);
        }
    }
    FUNC_LEAVE(new_dt);
}

/*-------------------------------------------------------------------------
 * Function:    H5T_close
 *
 * Purpose:     Frees a data type and all associated memory.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Monday, December  8, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T_close(H5T_t *dt)
{
    intn                    i;

    FUNC_ENTER(H5T_close, FAIL);

    assert(dt);
    assert(!dt->locked);

    if (dt && H5T_COMPOUND == dt->type) {
        for (i = 0; i < dt->u.compnd.nmembs; i++) {
            H5MM_xfree(dt->u.compnd.memb[i].name);
        }
        H5MM_xfree(dt->u.compnd.memb);
        H5MM_xfree(dt);

    } else if (dt) {
        H5MM_xfree(dt);
    }
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5T_is_atomic
 *
 * Purpose:     Determines if a data type is an atomic type.
 *
 * Return:      Success:        TRUE, FALSE
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hbool_t
H5T_is_atomic(const H5T_t *dt)
{
    FUNC_ENTER(H5T_is_atomic, FAIL);

    assert(dt);

    FUNC_LEAVE(H5T_COMPOUND == dt->type ? FALSE : TRUE);
}

/*-------------------------------------------------------------------------
 * Function:    H5T_get_size
 *
 * Purpose:     Determines the total size of a data type in bytes.
 *
 * Return:      Success:        Size of the data type in bytes.  The size of
 *                              the data type is the size of an instance of
 *                              that data type.
 *
 *              Failure:        0 (valid data types are never zero size)
 *
 * Programmer:  Robb Matzke
 *              Tuesday, December  9, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
size_t
H5T_get_size(const H5T_t *dt)
{
    FUNC_ENTER(H5T_get_size, 0);

    /* check args */
    assert(dt);

    FUNC_LEAVE(dt->size);
}

/*-------------------------------------------------------------------------
 * Function:    H5T_insert
 *
 * Purpose:     Adds a new MEMBER to the compound data type PARENT.  The new
 *              member will have a NAME that is unique within PARENT and an
 *              instance of PARENT will have the member begin at byte offset
 *              OFFSET from the beginning.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Monday, December  8, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T_insert(H5T_t *parent, const char *name, off_t offset, const H5T_t *member)
{
    intn                    i;
    H5T_t                  *tmp = NULL;

    FUNC_ENTER(H5T_insert, FAIL);

    /* check args */
    assert(parent && H5T_COMPOUND == parent->type);
    assert(!parent->locked);
    assert(member);
    assert(name && *name);

    /* Does NAME already exist in PARENT? */
    for (i = 0; i < parent->u.compnd.nmembs; i++) {
        if (!HDstrcmp(parent->u.compnd.memb[i].name, name)) {
            HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINSERT, FAIL,
                          "member name is not unique");
        }
    }

    /* Does the new member overlap any existing member ? */
    for (i = 0; i < parent->u.compnd.nmembs; i++) {
        if ((offset < parent->u.compnd.memb[i].offset &&
             offset + member->size > parent->u.compnd.memb[i].offset) ||
            (parent->u.compnd.memb[i].offset < offset &&
             parent->u.compnd.memb[i].offset +
             parent->u.compnd.memb[i].type.size > offset)) {
            HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINSERT, FAIL,
                          "member overlaps with another member");
        }
    }

    /* Increase member array if necessary */
    if (parent->u.compnd.nmembs >= parent->u.compnd.nalloc) {
        parent->u.compnd.nalloc += H5T_COMPND_INC;
        parent->u.compnd.memb = H5MM_xrealloc(parent->u.compnd.memb,
                                              (parent->u.compnd.nalloc *
                                               sizeof(H5T_member_t)));
    }
    /* Add member to end of member array */
    i = parent->u.compnd.nmembs;
    parent->u.compnd.memb[i].name = H5MM_xstrdup(name);
    parent->u.compnd.memb[i].offset = offset;
    parent->u.compnd.memb[i].ndims = 0;         /*defaults to scalar */

    tmp = H5T_copy(member);
    parent->u.compnd.memb[i].type = *tmp;
    H5MM_xfree(tmp);

    parent->u.compnd.nmembs++;
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5T_pack
 *
 * Purpose:     Recursively packs a compound data type by removing padding
 *              bytes. This is done in place (that is, destructively).
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T_pack(H5T_t *dt)
{
    int                     i;
    size_t                  offset;

    FUNC_ENTER(H5T_pack, FAIL);

    assert(dt);
    assert(!dt->locked);

    if (H5T_COMPOUND == dt->type) {
        /* Recursively pack the members */
        for (i = 0; i < dt->u.compnd.nmembs; i++) {
            if (H5T_pack(&(dt->u.compnd.memb[i].type)) < 0) {
                HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL,
                              "unable to pack part of a compound data type");
            }
        }

        /* Remove padding between members */
        H5T_sort_by_offset(dt);
        for (i = 0, offset = 0; i < dt->u.compnd.nmembs; i++) {
            dt->u.compnd.memb[i].offset = offset;
            offset += dt->u.compnd.memb[i].type.size;
        }

        /* Change total size */
        dt->size = MAX(1, offset);
    }
    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5T_sort_by_offset
 *
 * Purpose:     Sorts the members of a compound data type by their offsets.
 *              This even works for locked data types since it doesn't change
 *              the value of the type.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T_sort_by_offset(H5T_t *dt)
{
    int                     i, j, nmembs;
    hbool_t                 swapped;

    FUNC_ENTER(H5T_sort_by_offset, FAIL);

    /* Check args */
    assert(dt);
    assert(H5T_COMPOUND == dt->type);

    /* Use a bubble sort because we can short circuit */
    nmembs = dt->u.compnd.nmembs;
    for (i = nmembs - 1, swapped = TRUE; i > 0 && swapped; --i) {
        for (j = 0, swapped = FALSE; j < i; j++) {
            if (dt->u.compnd.memb[j].offset > dt->u.compnd.memb[j + 1].offset) {
                H5T_member_t            tmp = dt->u.compnd.memb[j];
                dt->u.compnd.memb[j] = dt->u.compnd.memb[j + 1];
                dt->u.compnd.memb[j + 1] = tmp;
                swapped = 1;
            }
        }
    }

#ifndef NDEBUG
    /* I never trust a sort :-) */
    for (i = 0; i < dt->u.compnd.nmembs - 1; i++) {
        assert(dt->u.compnd.memb[i].offset < dt->u.compnd.memb[i + 1].offset);
    }
#endif

    FUNC_LEAVE(SUCCEED);
}

/*-------------------------------------------------------------------------
 * Function:    H5T_cmp
 *
 * Purpose:     Compares two data types.
 *
 * Return:      Success:        0 if DT1 and DT2 are equal.
 *                              <0 if DT1 is less than DT2.
 *                              >0 if DT1 is greater than DT2.
 *
 *              Failure:        0, never fails
 *
 * Programmer:  Robb Matzke
 *              Wednesday, December 10, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
intn
H5T_cmp(const H5T_t *dt1, const H5T_t *dt2)
{
    intn                   *idx1 = NULL, *idx2 = NULL;
    intn                    ret_value = 0;
    intn                    i, j, tmp;
    hbool_t                 swapped;

    FUNC_ENTER(H5T_equal, 0);

    /* check args */
    assert(dt1);
    assert(dt2);

    /* the easy case */
    if (dt1 == dt2)
        HGOTO_DONE(0);

    /* compare */
    if (dt1->type < dt2->type)
        HGOTO_DONE(-1);
    if (dt1->type > dt2->type)
        HGOTO_DONE(1);

    if (dt1->size < dt2->size)
        HGOTO_DONE(-1);
    if (dt1->size > dt2->size)
        HGOTO_DONE(1);

    if (H5T_COMPOUND == dt1->type) {
        /*
         * Compound data types...
         */
        if (dt1->u.compnd.nmembs < dt2->u.compnd.nmembs)
            HGOTO_DONE(-1);
        if (dt1->u.compnd.nmembs > dt2->u.compnd.nmembs)
            HGOTO_DONE(1);

        /* Build an index for each type so the names are sorted */
        idx1 = H5MM_xmalloc(dt1->u.compnd.nmembs * sizeof(intn));
        idx2 = H5MM_xmalloc(dt1->u.compnd.nmembs * sizeof(intn));
        for (i = 0; i < dt1->u.compnd.nmembs; i++)
            idx1[i] = idx2[i] = i;
        for (i = dt1->u.compnd.nmembs - 1, swapped = TRUE; swapped && i >= 0; --i) {
            for (j = 0, swapped = FALSE; j < i; j++) {
                if (HDstrcmp(dt1->u.compnd.memb[idx1[j]].name,
                             dt1->u.compnd.memb[idx1[j + 1]].name) > 0) {
                    tmp = idx1[j];
                    idx1[j] = idx1[j + 1];
                    idx1[j + 1] = tmp;
                    swapped = TRUE;
                }
            }
        }
        for (i = dt1->u.compnd.nmembs - 1, swapped = TRUE; swapped && i >= 0; --i) {
            for (j = 0, swapped = FALSE; j < i; j++) {
                if (HDstrcmp(dt2->u.compnd.memb[idx2[j]].name,
                             dt2->u.compnd.memb[idx2[j + 1]].name) > 0) {
                    tmp = idx2[j];
                    idx2[j] = idx2[j + 1];
                    idx2[j + 1] = tmp;
                    swapped = TRUE;
                }
            }
        }

#ifndef NDEBUG
        /* I don't quite trust the code above yet :-)  --RPM */
        for (i = 0; i < dt1->u.compnd.nmembs; i++) {
            assert(HDstrcmp(dt1->u.compnd.memb[idx1[i]].name,
                            dt1->u.compnd.memb[idx1[i + 1]].name));
            assert(HDstrcmp(dt2->u.compnd.memb[idx2[i]].name,
                            dt2->u.compnd.memb[idx2[i + 1]].name));
        }
#endif

        /* Compare the members */
        for (i = 0; i < dt1->u.compnd.nmembs; i++) {
            tmp = HDstrcmp(dt1->u.compnd.memb[idx1[i]].name,
                           dt2->u.compnd.memb[idx2[i]].name);
            if (tmp < 0)
                HGOTO_DONE(-1);
            if (tmp > 0)
                HGOTO_DONE(1);

            if (dt1->u.compnd.memb[idx1[i]].offset <
                dt2->u.compnd.memb[idx2[i]].offset)
                HGOTO_DONE(-1);
            if (dt1->u.compnd.memb[idx1[i]].offset >
                dt2->u.compnd.memb[idx2[i]].offset)
                HGOTO_DONE(1);

            if (dt1->u.compnd.memb[idx1[i]].ndims <
                dt2->u.compnd.memb[idx2[i]].ndims)
                HGOTO_DONE(-1);
            if (dt1->u.compnd.memb[idx1[i]].ndims >
                dt2->u.compnd.memb[idx2[i]].ndims)
                HGOTO_DONE(1);

            for (j = 0; j < dt1->u.compnd.memb[idx1[i]].ndims; j++) {
                if (dt1->u.compnd.memb[idx1[i]].dim[j] <
                    dt2->u.compnd.memb[idx2[i]].dim[j])
                    HGOTO_DONE(-1);
                if (dt1->u.compnd.memb[idx1[i]].dim[j] >
                    dt2->u.compnd.memb[idx2[i]].dim[j])
                    HGOTO_DONE(1);
            }

            for (j = 0; j < dt1->u.compnd.memb[idx1[i]].ndims; j++) {
                if (dt1->u.compnd.memb[idx1[i]].perm[j] <
                    dt2->u.compnd.memb[idx2[i]].perm[j])
                    HGOTO_DONE(-1);
                if (dt1->u.compnd.memb[idx1[i]].perm[j] >
                    dt2->u.compnd.memb[idx2[i]].perm[j])
                    HGOTO_DONE(1);
            }

            tmp = H5T_cmp(&(dt1->u.compnd.memb[idx1[i]].type),
                          &(dt2->u.compnd.memb[idx2[i]].type));
            if (tmp < 0)
                HGOTO_DONE(-1);
            if (tmp > 0)
                HGOTO_DONE(1);
        }

    } else {
        /*
         * Atomic data types...
         */
        if (dt1->u.atomic.order < dt2->u.atomic.order)
            HGOTO_DONE(-1);
        if (dt1->u.atomic.order > dt2->u.atomic.order)
            HGOTO_DONE(1);

        if (dt1->u.atomic.prec < dt2->u.atomic.prec)
            HGOTO_DONE(-1);
        if (dt1->u.atomic.prec > dt2->u.atomic.prec)
            HGOTO_DONE(1);

        if (dt1->u.atomic.offset < dt2->u.atomic.offset)
            HGOTO_DONE(-1);
        if (dt1->u.atomic.offset > dt2->u.atomic.offset)
            HGOTO_DONE(1);

        if (dt1->u.atomic.lsb_pad < dt2->u.atomic.lsb_pad)
            HGOTO_DONE(-1);
        if (dt1->u.atomic.lsb_pad > dt2->u.atomic.lsb_pad)
            HGOTO_DONE(1);

        if (dt1->u.atomic.msb_pad < dt2->u.atomic.msb_pad)
            HGOTO_DONE(-1);
        if (dt1->u.atomic.msb_pad > dt2->u.atomic.msb_pad)
            HGOTO_DONE(1);

        switch (dt1->type) {
        case H5T_INTEGER:
            if (dt1->u.atomic.u.i.sign < dt2->u.atomic.u.i.sign)
                HGOTO_DONE(-1);
            if (dt1->u.atomic.u.i.sign > dt2->u.atomic.u.i.sign)
                HGOTO_DONE(1);
            break;

        case H5T_FLOAT:
            if (dt1->u.atomic.u.f.sign < dt2->u.atomic.u.f.sign)
                HGOTO_DONE(-1);
            if (dt1->u.atomic.u.f.sign > dt2->u.atomic.u.f.sign)
                HGOTO_DONE(1);

            if (dt1->u.atomic.u.f.epos < dt2->u.atomic.u.f.epos)
                HGOTO_DONE(-1);
            if (dt1->u.atomic.u.f.epos > dt2->u.atomic.u.f.epos)
                HGOTO_DONE(1);

            if (dt1->u.atomic.u.f.esize <
                dt2->u.atomic.u.f.esize)
                HGOTO_DONE(-1);
            if (dt1->u.atomic.u.f.esize >
                dt2->u.atomic.u.f.esize)
                HGOTO_DONE(1);

            if (dt1->u.atomic.u.f.ebias <
                dt2->u.atomic.u.f.ebias)
                HGOTO_DONE(-1);
            if (dt1->u.atomic.u.f.ebias >
                dt2->u.atomic.u.f.ebias)
                HGOTO_DONE(1);

            if (dt1->u.atomic.u.f.mpos < dt2->u.atomic.u.f.mpos)
                HGOTO_DONE(-1);
            if (dt1->u.atomic.u.f.mpos > dt2->u.atomic.u.f.mpos)
                HGOTO_DONE(1);

            if (dt1->u.atomic.u.f.msize <
                dt2->u.atomic.u.f.msize)
                HGOTO_DONE(-1);
            if (dt1->u.atomic.u.f.msize >
                dt2->u.atomic.u.f.msize)
                HGOTO_DONE(1);

            if (dt1->u.atomic.u.f.norm < dt2->u.atomic.u.f.norm)
                HGOTO_DONE(-1);
            if (dt1->u.atomic.u.f.norm > dt2->u.atomic.u.f.norm)
                HGOTO_DONE(1);

            if (dt1->u.atomic.u.f.pad < dt2->u.atomic.u.f.pad)
                HGOTO_DONE(-1);
            if (dt1->u.atomic.u.f.pad > dt2->u.atomic.u.f.pad)
                HGOTO_DONE(1);

            break;

        case H5T_TIME:
            /*void */
            break;

        case H5T_STRING:
            if (dt1->u.atomic.u.s.cset < dt1->u.atomic.u.s.cset)
                HGOTO_DONE(-1);
            if (dt1->u.atomic.u.s.cset > dt1->u.atomic.u.s.cset)
                HGOTO_DONE(1);

            if (dt1->u.atomic.u.s.pad < dt1->u.atomic.u.s.pad)
                HGOTO_DONE(-1);
            if (dt1->u.atomic.u.s.pad > dt1->u.atomic.u.s.pad)
                HGOTO_DONE(1);

            break;

        case H5T_BITFIELD:
            /*void */
            break;

        case H5T_OPAQUE:
            /*void */
            break;

        default:
            assert("not implemented yet" && 0);
        }
    }

  done:
    H5MM_xfree(idx1);
    H5MM_xfree(idx2);

    FUNC_LEAVE(ret_value);
}

/*-------------------------------------------------------------------------
 * Function:    H5T_find
 *
 * Purpose:     Finds a conversion function for the specified path.
 *
 * Return:      Success:        A pointer to an appropriate conversion
 *                              function.
 *
 *              Failure:        NULL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January 14, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_conv_t
H5T_find(const H5T_t *src, const H5T_t *dst)
{
    H5T_path_t             *path = NULL;
    H5T_conv_t              ret_value = NULL;

    FUNC_ENTER(H5T_find, NULL);

    /* Check args */
    assert(src);
    assert(dst);

    /* No-op case */
    if (0 == H5T_cmp(src, dst))
        HRETURN(H5T_conv_noop);

    /* Find it */
    if (NULL == (path = H5T_path_find(src, dst, TRUE))) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL,
                      "unable to create conversion path");
    }
    ret_value = path->hard;
    if (!ret_value)
        ret_value = path->soft;

    if (!ret_value) {
        HRETURN_ERROR(H5E_DATATYPE, H5E_NOTFOUND, NULL,
                      "no conversion function for that path");
    }
    FUNC_LEAVE(ret_value);
}

/*-------------------------------------------------------------------------
 * Function:    H5T_path_find
 *
 * Purpose:     Finds the path which converts type SRC_ID to type DST_ID.  If
 *              the path isn't found and CREATE is non-zero then a new path
 *              is created.
 *
 * Return:      Success:        Pointer to the path, valid until the path
 *                              database is modified.
 *
 *              Failure:        NULL
 *
 * Programmer:  Robb Matzke
 *              Tuesday, January 13, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
H5T_path_t             *
H5T_path_find(const H5T_t *src, const H5T_t *dst, hbool_t create)
{
    intn                    lt = 0;     /*left edge (inclusive)         */
    intn                    rt = H5T_npath_g;   /*right edge (exclusive)        */
    intn                    md = 0;     /*middle                        */
    intn                    cmp = -1;   /*comparison result             */
    H5T_path_t             *path = NULL;        /*path found                    */
    int                     i;
    hid_t                   src_id, dst_id;

    FUNC_ENTER(H5T_path_find, NULL);

    /* Check args */
    assert(src);
    assert(dst);

    /* Binary search */
    while (lt < rt) {
        md = (lt + rt) / 2;

        cmp = H5T_cmp(src, H5T_path_g[md].src);
        if (0 == cmp)
            cmp = H5T_cmp(dst, H5T_path_g[md].dst);

        if (cmp < 0) {
            rt = md;
        } else if (cmp > 0) {
            lt = md + 1;
        } else {
            HRETURN(H5T_path_g + md);
        }
    }

    /* Insert */
    if (create) {
        if (H5T_npath_g >= H5T_apath_g) {
            H5T_apath_g = MAX(64, 2 * H5T_apath_g);
            H5T_path_g = H5MM_xrealloc(H5T_path_g,
                                       H5T_apath_g * sizeof(H5T_path_t));
        }
        if (cmp > 0)
            md++;

        /* make room */
        HDmemmove(H5T_path_g + md + 1, H5T_path_g + md,
                  (H5T_npath_g - md) * sizeof(H5T_path_t));
        H5T_npath_g++;

        /* insert */
        path = H5T_path_g + md;
        HDmemset(path, 0, sizeof(H5T_path_t));
        path->src = H5T_copy(src);
        path->dst = H5T_copy(dst);

        /* Locate soft function */
        for (i = H5T_nsoft_g - 1; i >= 0 && !path->soft; --i) {
            if (src->type != H5T_soft_g[i].src || dst->type != H5T_soft_g[i].dst) {
                continue;
            }
            if ((src_id=H5A_register(H5_DATATYPE, H5T_copy(path->src))) < 0 ||
                (dst_id=H5A_register(H5_DATATYPE, H5T_copy(path->dst))) < 0) {
                HRETURN_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, NULL,
                              "unable to register conv types for query");
            }
            if ((H5T_soft_g[i].func) (src_id, dst_id, 0, NULL, NULL) >= 0) {
                path->soft = H5T_soft_g[i].func;
            }
            H5A_dec_ref(src_id);
            H5A_dec_ref(dst_id);
            H5ECLEAR;
        }
    }
    FUNC_LEAVE(path);
}

/*-------------------------------------------------------------------------
 * Function:    H5T_debug
 *
 * Purpose:     Prints information about a data type.
 *
 * Return:      Success:        SUCCEED
 *
 *              Failure:        FAIL
 *
 * Programmer:  Robb Matzke
 *              Wednesday, January  7, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5T_debug(H5T_t *dt, FILE * stream)
{
    const char             *s = "";
    int                     i, j;
    uint64                  tmp;

    FUNC_ENTER(H5T_debug, FAIL);

    /* Check args */
    assert(dt);
    assert(stream);

    switch (dt->type) {
    case H5T_INTEGER:
        s = "int";
        break;
    case H5T_FLOAT:
        s = "float";
        break;
    case H5T_TIME:
        s = "time";
        break;
    case H5T_STRING:
        s = "str";
        break;
    case H5T_BITFIELD:
        s = "bits";
        break;
    case H5T_OPAQUE:
        s = "opaque";
        break;
    case H5T_COMPOUND:
        s = "struct";
        break;
    default:
        s = "";
        break;
    }

    fprintf(stream, "%s%s {nbytes=%d",
            s, dt->locked ? "[!]" : "", dt->size);

    if (H5T_is_atomic(dt)) {
        switch (dt->u.atomic.order) {
        case H5T_ORDER_BE:
            s = "BE";
            break;
        case H5T_ORDER_LE:
            s = "LE";
            break;
        case H5T_ORDER_VAX:
            s = "VAX";
            break;
        case H5T_ORDER_NONE:
            s = "NONE";
            break;
        default:
            s = "order?";
            break;
        }
        fprintf(stream, ", %s", s);

        if (dt->u.atomic.offset) {
            fprintf(stream, ", offset=%lu",
                    (unsigned long) (dt->u.atomic.offset));
        }
        if (dt->u.atomic.prec != 8 * dt->size) {
            fprintf(stream, ", prec=%lu",
                    (unsigned long) (dt->u.atomic.prec));
        }
        switch (dt->type) {
        case H5T_INTEGER:
            switch (dt->u.atomic.u.i.sign) {
            case H5T_SGN_NONE:
                s = "unsigned";
                break;
            case H5T_SGN_2:
                s = NULL;
                break;
            default:
                s = "sign?";
                break;
            }
            if (s)
                fprintf(stream, ", %s", s);
            break;

        case H5T_FLOAT:
            switch (dt->u.atomic.u.f.norm) {
            case H5T_NORM_IMPLIED:
                s = "implied";
                break;
            case H5T_NORM_MSBSET:
                s = "msbset";
                break;
            case H5T_NORM_NONE:
                s = "no-norm";
                break;
            default:
                s = "norm?";
                break;
            }
            fprintf(stream, ", sign=%lu+1",
                    (unsigned long) (dt->u.atomic.u.f.sign));
            fprintf(stream, ", mant=%lu+%lu (%s)",
                    (unsigned long) (dt->u.atomic.u.f.mpos),
                    (unsigned long) (dt->u.atomic.u.f.msize), s);
            fprintf(stream, ", exp=%lu+%lu",
                    (unsigned long) (dt->u.atomic.u.f.epos),
                    (unsigned long) (dt->u.atomic.u.f.esize));
            tmp = dt->u.atomic.u.f.ebias >> 32;
            if (tmp) {
                uintn                   hi = tmp;
                uintn                   lo = dt->u.atomic.u.f.ebias & 0xffffffff;
                fprintf(stream, " bias=0x%08x%08x", hi, lo);
            } else {
                uintn                   lo = dt->u.atomic.u.f.ebias & 0xffffffff;
                fprintf(stream, " bias=0x%08x", lo);
            }
            break;

        default:
            /* No additional info */
            break;
        }
    } else {
        for (i = 0; i < dt->u.compnd.nmembs; i++) {
            fprintf(stream, "\n\"%s\" @%lu",
                    dt->u.compnd.memb[i].name,
                    (unsigned long) (dt->u.compnd.memb[i].offset));
            if (dt->u.compnd.memb[i].ndims) {
                fprintf(stream, "[");
                for (j = 0; j < dt->u.compnd.memb[i].ndims; j++) {
                    fprintf(stream, "%s%d", j ? ", " : "",
                            dt->u.compnd.memb[i].dim[j]);
                }
                fprintf(stream, "]");
            }
            fprintf(stream, " ");
            H5T_debug(&(dt->u.compnd.memb[i].type), stream);
        }
        fprintf(stream, "\n");
    }
    fprintf(stream, "}");

    FUNC_LEAVE(SUCCEED);
}