ba087ce2b5
header file, FUNC_ENTER / LEAVE, etc). Removed remaining personal email addresses from library source code (still needs cleaned from other directories). Misc. warning, style, and whitespace cleanup.
277 lines
9.6 KiB
C
277 lines
9.6 KiB
C
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by The HDF Group. *
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* Copyright by the Board of Trustees of the University of Illinois. *
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* All rights reserved. *
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* *
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* This file is part of HDF5. The full HDF5 copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the COPYING file, which can be found at the root of the source code *
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* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
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* If you do not have access to either file, you may request a copy from *
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* help@hdfgroup.org. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/*
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* Module Info: This module contains the functionality for setting & querying
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* the datatype precision for the H5T interface.
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*/
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#include "H5Tmodule.h" /* This source code file is part of the H5T module */
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#include "H5private.h" /* Generic Functions */
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#include "H5Eprivate.h" /* Error handling */
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#include "H5Iprivate.h" /* IDs */
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#include "H5Tpkg.h" /* Datatypes */
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/* Static local functions */
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static herr_t H5T__set_precision(const H5T_t *dt, size_t prec);
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/*-------------------------------------------------------------------------
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* Function: H5Tget_precision
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*
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* Purpose: Gets the precision of a datatype. The precision is
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* the number of significant bits which, unless padding is
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* present, is 8 times larger than the value returned by
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* H5Tget_size().
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*
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* Return: Success: Number of significant bits
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*
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* Failure: 0 (all atomic types have at least one
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* significant bit)
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*
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* Programmer: Robb Matzke
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* Wednesday, January 7, 1998
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*
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*-------------------------------------------------------------------------
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*/
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size_t
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H5Tget_precision(hid_t type_id)
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{
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H5T_t *dt;
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size_t ret_value;
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FUNC_ENTER_API(0)
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H5TRACE1("z", "i", type_id);
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/* Check args */
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if (NULL == (dt = (H5T_t *)H5I_object_verify(type_id,H5I_DATATYPE)))
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HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not a datatype")
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/* Get precision */
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if((ret_value = H5T_get_precision(dt)) == 0)
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HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, 0, "cant't get precision for specified datatype")
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done:
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FUNC_LEAVE_API(ret_value)
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} /* end H5Tget_precision() */
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/*-------------------------------------------------------------------------
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* Function: H5T_get_precision
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*
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* Purpose: Gets the precision of a datatype. The precision is
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* the number of significant bits which, unless padding is
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* present, is 8 times larger than the value returned by
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* H5Tget_size().
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*
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* Return: Success: Number of significant bits
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* Failure: 0 (all atomic types have at least one
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* significant bit)
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*
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* Programmer: Quincey Koziol
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* Wednesday, October 17, 2007
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*
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*-------------------------------------------------------------------------
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*/
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size_t
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H5T_get_precision(const H5T_t *dt)
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{
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size_t ret_value = 0; /* Return value */
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FUNC_ENTER_NOAPI(0)
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/* Defer to parent*/
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while(dt->shared->parent)
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dt = dt->shared->parent;
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if(!H5T_IS_ATOMIC(dt->shared))
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HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, 0, "operation not defined for specified datatype")
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/* Precision */
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ret_value = dt->shared->u.atomic.prec;
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done:
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FUNC_LEAVE_NOAPI(ret_value)
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} /* end H5T_get_precision() */
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/*-------------------------------------------------------------------------
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* Function: H5Tset_precision
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*
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* Purpose: Sets the precision of a datatype. The precision is
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* the number of significant bits which, unless padding is
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* present, is 8 times larger than the value returned by
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* H5Tget_size().
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*
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* If the precision is increased then the offset is decreased
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* and then the size is increased to insure that significant
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* bits do not "hang over" the edge of the datatype.
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*
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* The precision property of strings is read-only.
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*
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* When decreasing the precision of a floating point type, set
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* the locations and sizes of the sign, mantissa, and exponent
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* fields first.
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*
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* Return: Non-negative on success/Negative on failure
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*
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* Programmer: Robb Matzke
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* Wednesday, January 7, 1998
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*
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*-------------------------------------------------------------------------
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*/
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herr_t
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H5Tset_precision(hid_t type_id, size_t prec)
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{
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H5T_t *dt = NULL;
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herr_t ret_value=SUCCEED; /* Return value */
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FUNC_ENTER_API(FAIL)
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H5TRACE2("e", "iz", type_id, prec);
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/* Check args */
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if (NULL == (dt = (H5T_t *)H5I_object_verify(type_id,H5I_DATATYPE)))
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HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
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if (H5T_STATE_TRANSIENT!=dt->shared->state)
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HGOTO_ERROR(H5E_ARGS, H5E_CANTSET, FAIL, "datatype is read-only")
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if (NULL != dt->vol_obj)
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HGOTO_ERROR(H5E_ARGS, H5E_CANTSET, FAIL, "datatype is committed")
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if (prec == 0)
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HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "precision must be positive")
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if (H5T_ENUM==dt->shared->type && dt->shared->u.enumer.nmembs>0)
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HGOTO_ERROR(H5E_DATATYPE, H5E_CANTSET, FAIL, "operation not allowed after members are defined")
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if (H5T_STRING==dt->shared->type)
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HGOTO_ERROR(H5E_ARGS, H5E_UNSUPPORTED, FAIL, "precision for this type is read-only")
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if (H5T_COMPOUND==dt->shared->type || H5T_OPAQUE==dt->shared->type)
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HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "operation not defined for specified datatype")
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/* Do the work */
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if (H5T__set_precision(dt, prec)<0)
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HGOTO_ERROR(H5E_DATATYPE, H5E_CANTSET, FAIL, "unable to set precision")
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done:
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FUNC_LEAVE_API(ret_value)
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}
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/*-------------------------------------------------------------------------
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* Function: H5T__set_precision
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*
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* Purpose: Sets the precision of a datatype. The precision is
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* the number of significant bits which, unless padding is
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* present, is 8 times larger than the value returned by
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* H5Tget_size().
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*
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* If the precision is increased then the offset is decreased
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* and then the size is increased to insure that significant
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* bits do not "hang over" the edge of the datatype.
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*
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* The precision property of strings is read-only.
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*
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* When decreasing the precision of a floating point type, set
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* the locations and sizes of the sign, mantissa, and exponent
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* fields first.
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*
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* Return: Non-negative on success/Negative on failure
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*
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* Programmer: Robb Matzke
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* Wednesday, January 7, 1998
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*
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*-------------------------------------------------------------------------
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*/
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static herr_t
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H5T__set_precision(const H5T_t *dt, size_t prec)
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{
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size_t offset, size;
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herr_t ret_value=SUCCEED; /* Return value */
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FUNC_ENTER_STATIC
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/* Check args */
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HDassert(dt);
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HDassert(prec>0);
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HDassert(H5T_OPAQUE!=dt->shared->type);
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HDassert(H5T_COMPOUND!=dt->shared->type);
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HDassert(H5T_STRING!=dt->shared->type);
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HDassert(!(H5T_ENUM==dt->shared->type && 0==dt->shared->u.enumer.nmembs));
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if (dt->shared->parent) {
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if (H5T__set_precision(dt->shared->parent, prec)<0)
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HGOTO_ERROR(H5E_DATATYPE, H5E_CANTSET, FAIL, "unable to set precision for base type")
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/* Adjust size of datatype appropriately */
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if(dt->shared->type==H5T_ARRAY)
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dt->shared->size = dt->shared->parent->shared->size * dt->shared->u.array.nelem;
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else if(dt->shared->type!=H5T_VLEN)
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dt->shared->size = dt->shared->parent->shared->size;
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} else {
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if (H5T_IS_ATOMIC(dt->shared)) {
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/* Adjust the offset and size */
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offset = dt->shared->u.atomic.offset;
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size = dt->shared->size;
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if (prec > 8*size)
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offset = 0;
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else if (offset+prec > 8 * size)
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offset = 8 * size - prec;
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if (prec > 8*size)
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size = (prec+7) / 8;
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/* Check that things are still kosher */
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switch (dt->shared->type) {
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case H5T_INTEGER:
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case H5T_TIME:
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case H5T_BITFIELD:
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/* nothing to check */
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break;
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case H5T_FLOAT:
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/*
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* The sign, mantissa, and exponent fields should be adjusted
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* first when decreasing the precision of a floating point
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* type.
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*/
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if (dt->shared->u.atomic.u.f.sign >= prec+offset ||
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dt->shared->u.atomic.u.f.epos + dt->shared->u.atomic.u.f.esize > prec+offset ||
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dt->shared->u.atomic.u.f.mpos + dt->shared->u.atomic.u.f.msize > prec+offset)
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HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "adjust sign, mantissa, and exponent fields first")
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break;
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case H5T_NO_CLASS:
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case H5T_STRING:
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case H5T_OPAQUE:
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case H5T_COMPOUND:
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case H5T_REFERENCE:
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case H5T_ENUM:
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case H5T_VLEN:
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case H5T_ARRAY:
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case H5T_NCLASSES:
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default:
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HGOTO_ERROR(H5E_ARGS, H5E_UNSUPPORTED, FAIL, "operation not defined for datatype class")
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} /* end switch */
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/* Commit */
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dt->shared->size = size;
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dt->shared->u.atomic.offset = offset;
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dt->shared->u.atomic.prec = prec;
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} /* end if */
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else
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HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "operation not defined for specified datatype")
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} /* end else */
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done:
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FUNC_LEAVE_NOAPI(ret_value)
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}
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