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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 precision for the H5T interface.
*/
#define H5T_PACKAGE /*suppress error about including H5Tpkg */
/* Interface initialization */
#define H5_INTERFACE_INIT_FUNC H5T_init_precis_interface
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5Iprivate.h" /* IDs */
#include "H5Tpkg.h" /* Datatypes */
/* Static local functions */
static herr_t H5T_set_precision(const H5T_t *dt, size_t prec);
/*--------------------------------------------------------------------------
NAME
H5T_init_precis_interface -- Initialize interface-specific information
USAGE
herr_t H5T_init_precis_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_precis_interface(void)
{
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5T_init_precis_interface)
FUNC_LEAVE_NOAPI(H5T_init())
} /* H5T_init_precis_interface() */
/*-------------------------------------------------------------------------
* Function: H5Tget_precision
*
* Purpose: Gets the precision of a datatype. 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:
* Robb Matzke, 22 Dec 1998
* Also works for derived datatypes.
*
*-------------------------------------------------------------------------
*/
size_t
H5Tget_precision(hid_t type_id)
{
H5T_t *dt = NULL;
size_t ret_value;
FUNC_ENTER_API(H5Tget_precision, 0)
H5TRACE1("z","i",type_id);
/* Check args */
if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)))
HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not a datatype")
while (dt->shared->parent)
dt = dt->shared->parent; /*defer to parent*/
if (!H5T_IS_ATOMIC(dt->shared))
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, 0, "operation not defined for specified datatype")
/* Precision */
ret_value = dt->shared->u.atomic.prec;
done:
FUNC_LEAVE_API(ret_value)
}
/*-------------------------------------------------------------------------
* Function: H5Tset_precision
*
* Purpose: Sets the precision of a datatype. 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 datatype.
*
* The precision property of strings is read-only.
*
* When decreasing the precision of a floating point type, set
* the locations and sizes of the sign, mantissa, and exponent
* fields first.
*
* 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_precision(hid_t type_id, size_t prec)
{
H5T_t *dt = NULL;
herr_t ret_value=SUCCEED; /* Return value */
FUNC_ENTER_API(H5Tset_precision, FAIL)
H5TRACE2("e","iz",type_id,prec);
/* Check args */
if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)))
HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
if (H5T_STATE_TRANSIENT!=dt->shared->state)
HGOTO_ERROR(H5E_ARGS, H5E_CANTSET, FAIL, "datatype is read-only")
if (prec == 0)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "precision must be positive")
if (H5T_ENUM==dt->shared->type && dt->shared->u.enumer.nmembs>0)
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTSET, FAIL, "operation not allowed after members are defined")
if (H5T_STRING==dt->shared->type)
HGOTO_ERROR(H5E_ARGS, H5E_UNSUPPORTED, FAIL, "precision for this type is read-only")
if (H5T_COMPOUND==dt->shared->type || H5T_OPAQUE==dt->shared->type)
HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "operation not defined for specified datatype")
/* Do the work */
if (H5T_set_precision(dt, prec)<0)
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTSET, FAIL, "unable to set precision")
done:
FUNC_LEAVE_API(ret_value)
}
/*-------------------------------------------------------------------------
* Function: H5T_set_precision
*
* Purpose: Sets the precision of a datatype. 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 datatype.
*
* The precision property of strings is read-only.
*
* When decreasing the precision of a floating point type, set
* the locations and sizes of the sign, mantissa, and exponent
* fields first.
*
* 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 datatypes.
*
*-------------------------------------------------------------------------
*/
static herr_t
H5T_set_precision(const H5T_t *dt, size_t prec)
{
size_t offset, size;
herr_t ret_value=SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5T_set_precision, FAIL)
/* Check args */
assert(dt);
assert(prec>0);
assert(H5T_OPAQUE!=dt->shared->type);
assert(H5T_COMPOUND!=dt->shared->type);
assert(H5T_STRING!=dt->shared->type);
assert(!(H5T_ENUM==dt->shared->type && 0==dt->shared->u.enumer.nmembs));
if (dt->shared->parent) {
if (H5T_set_precision(dt->shared->parent, prec)<0)
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTSET, FAIL, "unable to set precision 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 (H5T_IS_ATOMIC(dt->shared)) {
/* Adjust the offset and size */
offset = dt->shared->u.atomic.offset;
size = dt->shared->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->shared->type) {
case H5T_INTEGER:
case H5T_TIME:
case H5T_BITFIELD:
/* nothing to check */
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->shared->u.atomic.u.f.sign >= prec ||
dt->shared->u.atomic.u.f.epos + dt->shared->u.atomic.u.f.esize > prec ||
dt->shared->u.atomic.u.f.mpos + dt->shared->u.atomic.u.f.msize > prec)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "adjust sign, mantissa, and exponent fields first")
break;
default:
HGOTO_ERROR(H5E_ARGS, H5E_UNSUPPORTED, FAIL, "operation not defined for datatype class")
} /* end switch */ /*lint !e788 All appropriate cases are covered */
/* Commit */
dt->shared->size = size;
dt->shared->u.atomic.offset = offset;
dt->shared->u.atomic.prec = prec;
} /* end if */
else
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "operation not defined for specified datatype")
} /* end else */
done:
FUNC_LEAVE_NOAPI(ret_value)
}
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