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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the files COPYING and Copyright.html. COPYING can be found at the root *
* of the source code distribution tree; Copyright.html can be found at the *
* root level of an installed copy of the electronic HDF5 document set and *
* is linked from the top-level documents page. It can also be found at *
* http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Module Info: This module contains the functionality for setting & querying
* the datatype offset for the H5T interface.
*/
#define H5T_PACKAGE /*suppress error about including H5Tpkg */
#include "H5private.h" /*generic functions */
#include "H5Eprivate.h" /*error handling */
#include "H5Iprivate.h" /*ID functions */
#include "H5Tpkg.h" /*data-type functions */
#define PABLO_MASK H5Toffset_mask
/* Interface initialization */
static int interface_initialize_g = 0;
#define INTERFACE_INIT H5T_init_offset_interface
static herr_t H5T_init_offset_interface(void);
/* Static local functions */
static herr_t H5T_set_offset(H5T_t *dt, size_t offset);
/*--------------------------------------------------------------------------
NAME
H5T_init_offset_interface -- Initialize interface-specific information
USAGE
herr_t H5T_init_offset_interface()
RETURNS
Non-negative on success/Negative on failure
DESCRIPTION
Initializes any interface-specific data or routines. (Just calls
H5T_init_iterface currently).
--------------------------------------------------------------------------*/
static herr_t
H5T_init_offset_interface(void)
{
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5T_init_offset_interface);
FUNC_LEAVE_NOAPI(H5T_init());
} /* H5T_init_offset_interface() */
/*-------------------------------------------------------------------------
* 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 (non-negative)
*
* Failure: Negative
*
* Programmer: Robb Matzke
* Wednesday, January 7, 1998
*
* Modifications:
* Robb Matzke, 22 Dec 1998
* Also works for derived data types.
*
*-------------------------------------------------------------------------
*/
int
H5Tget_offset(hid_t type_id)
{
H5T_t *dt = NULL;
int ret_value;
FUNC_ENTER_API(H5Tget_offset, -1);
H5TRACE1("Is","i",type_id);
/* Check args */
if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)))
HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an atomic data type");
while (dt->shared->parent)
dt = dt->shared->parent; /*defer to parent*/
if (H5T_COMPOUND==dt->shared->type || H5T_OPAQUE==dt->shared->type)
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "operation not defined for specified data type");
/* Offset */
assert(H5T_IS_ATOMIC(dt->shared));
ret_value = (int)dt->shared->u.atomic.offset;
done:
FUNC_LEAVE_API(ret_value);
}
/*-------------------------------------------------------------------------
* 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: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Wednesday, January 7, 1998
*
* Modifications:
* Robb Matzke, 22 Dec 1998
* Moved real work to a private function.
*
*-------------------------------------------------------------------------
*/
herr_t
H5Tset_offset(hid_t type_id, size_t offset)
{
H5T_t *dt = NULL;
herr_t ret_value=SUCCEED; /* Return value */
FUNC_ENTER_API(H5Tset_offset, FAIL);
H5TRACE2("e","iz",type_id,offset);
/* Check args */
if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)))
HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an atomic data type");
if (H5T_STATE_TRANSIENT!=dt->shared->state)
HGOTO_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
if (H5T_STRING == dt->shared->type && offset != 0)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "offset must be zero for this type");
if (H5T_ENUM==dt->shared->type && dt->shared->u.enumer.nmembs>0)
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "operation not allowed after members are defined");
if (H5T_COMPOUND==dt->shared->type || H5T_REFERENCE==dt->shared->type || H5T_OPAQUE==dt->shared->type)
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "operation not defined for this datatype");
/* Do the real work */
if (H5T_set_offset(dt, offset)<0)
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to set offset");
done:
FUNC_LEAVE_API(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5T_set_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: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Wednesday, January 7, 1998
*
* Modifications:
* Robb Matzke, 22 Dec 1998
* Also works for derived data types.
*
*-------------------------------------------------------------------------
*/
static herr_t
H5T_set_offset(H5T_t *dt, size_t offset)
{
herr_t ret_value=SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5T_set_offset, FAIL);
/* Check args */
assert(dt);
assert(H5T_STRING!=dt->shared->type || 0==offset);
assert(H5T_REFERENCE!=dt->shared->type);
assert(H5T_OPAQUE!=dt->shared->type);
assert(H5T_COMPOUND!=dt->shared->type);
assert(!(H5T_ENUM==dt->shared->type && 0==dt->shared->u.enumer.nmembs));
if (dt->shared->parent) {
if (H5T_set_offset(dt->shared->parent, offset)<0)
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to set offset for base type");
/* Adjust size of datatype appropriately */
if(dt->shared->type==H5T_ARRAY)
dt->shared->size = dt->shared->parent->shared->size * dt->shared->u.array.nelem;
else if(dt->shared->type!=H5T_VLEN)
dt->shared->size = dt->shared->parent->shared->size;
} else {
if (offset+dt->shared->u.atomic.prec > 8*dt->shared->size)
dt->shared->size = (offset + dt->shared->u.atomic.prec + 7) / 8;
dt->shared->u.atomic.offset = offset;
}
done:
FUNC_LEAVE_NOAPI(ret_value);
}
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