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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the 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://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include "hdf5.h"
#include "h5tools.h"
/*-------------------------------------------------------------------------
* print a warning message
*-------------------------------------------------------------------------
*/
static void print_warning(const char *dname, const char *fname)
{
fprintf(stderr,
"warning: dataset <%s> cannot be read, %s filter is not available\n",
dname, fname);
}
/*-------------------------------------------------------------------------
* Function: h5tools_canreadf
*
* Purpose: check if the dataset creation property list has filters that
* are not registered in the current configuration
* 1) the external filters GZIP and SZIP might not be available
* 2) the internal filters might be turned off
*
* Return: 1, can read, 0, cannot, -1 error
*
* Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
*
* Date: March 1, 2004
*
*-------------------------------------------------------------------------
*/
int h5tools_canreadf(const char* name, /* object name, serves also as boolean print */
hid_t dcpl_id) /* dataset creation property list */
{
int nfilters; /* number of filters */
H5Z_filter_t filtn; /* filter identification number */
int i; /* index */
int udfilter_avail; /* index */
/* get information about filters */
if ((nfilters = H5Pget_nfilters(dcpl_id)) < 0)
return -1;
/* if we do not have filters, we can read the dataset safely */
if (!nfilters)
return 1;
/* check availability of filters */
for (i = 0; i < nfilters; i++) {
if ((filtn = H5Pget_filter2(dcpl_id, (unsigned) i, 0, 0, 0, (size_t) 0, 0, NULL)) < 0)
return -1;
switch (filtn) {
/*-------------------------------------------------------------------------
* user defined filter
*-------------------------------------------------------------------------
*/
default:
if ((udfilter_avail = H5Zfilter_avail(filtn)) < 0)
return -1;
else if (udfilter_avail == 0) {
if (name)
print_warning(name, "user defined");
return 0;
}
break;
/*-------------------------------------------------------------------------
* H5Z_FILTER_DEFLATE 1 , deflation like gzip
*-------------------------------------------------------------------------
*/
case H5Z_FILTER_DEFLATE:
#ifndef H5_HAVE_FILTER_DEFLATE
if (name)
print_warning(name,"deflate");
return 0;
#endif
break;
/*-------------------------------------------------------------------------
* H5Z_FILTER_SZIP 4 , szip compression
*-------------------------------------------------------------------------
*/
case H5Z_FILTER_SZIP:
#ifndef H5_HAVE_FILTER_SZIP
if (name)
print_warning(name,"SZIP");
return 0;
#endif
break;
/*-------------------------------------------------------------------------
* H5Z_FILTER_SHUFFLE 2 , shuffle the data
*-------------------------------------------------------------------------
*/
case H5Z_FILTER_SHUFFLE:
break;
/*-------------------------------------------------------------------------
* H5Z_FILTER_FLETCHER32 3 , fletcher32 checksum of EDC
*-------------------------------------------------------------------------
*/
case H5Z_FILTER_FLETCHER32:
break;
/*-------------------------------------------------------------------------
* H5Z_FILTER_NBIT
*-------------------------------------------------------------------------
*/
case H5Z_FILTER_NBIT:
break;
/*-------------------------------------------------------------------------
* H5Z_FILTER_SCALEOFFSET
*-------------------------------------------------------------------------
*/
case H5Z_FILTER_SCALEOFFSET:
break;
}/*switch*/
}/*for*/
return 1;
}
/*-------------------------------------------------------------------------
* Function: h5tools_canwritef
*
* Purpose: check if the filter is available and can write data.
* At this time, all filters that are available can write data,
* except SZIP, which may be configured decoder-only.
*
* Return: 1, can write, 0, cannot, -1 error
*
* Programmer:
*
* Date: October 5, 2004
*
*-------------------------------------------------------------------------
*/
int h5tools_can_encode(H5Z_filter_t filtn) {
switch (filtn) {
/* user defined filter */
default:
return 0;
case H5Z_FILTER_DEFLATE:
#ifndef H5_HAVE_FILTER_DEFLATE
return 0;
#endif
break;
case H5Z_FILTER_SZIP:
#ifndef H5_HAVE_FILTER_SZIP
return 0;
#else
{
unsigned int filter_config_flags;
if (H5Zget_filter_info(filtn, &filter_config_flags) < 0)
return -1;
if ((filter_config_flags
& (H5Z_FILTER_CONFIG_ENCODE_ENABLED | H5Z_FILTER_CONFIG_DECODE_ENABLED)) == 0) {
/* filter present but neither encode nor decode is supported (???) */
return -1;
}
else if ((filter_config_flags
& (H5Z_FILTER_CONFIG_ENCODE_ENABLED | H5Z_FILTER_CONFIG_DECODE_ENABLED)) == H5Z_FILTER_CONFIG_DECODE_ENABLED) {
/* decoder only: read but not write */
return 0;
}
else if ((filter_config_flags
& (H5Z_FILTER_CONFIG_ENCODE_ENABLED | H5Z_FILTER_CONFIG_DECODE_ENABLED)) == H5Z_FILTER_CONFIG_ENCODE_ENABLED) {
/* encoder only: write but not read (???) */
return -1;
}
else if ((filter_config_flags
& (H5Z_FILTER_CONFIG_ENCODE_ENABLED | H5Z_FILTER_CONFIG_DECODE_ENABLED))
== (H5Z_FILTER_CONFIG_ENCODE_ENABLED | H5Z_FILTER_CONFIG_DECODE_ENABLED)) {
return 1;
}
}
#endif
break;
case H5Z_FILTER_SHUFFLE:
break;
case H5Z_FILTER_FLETCHER32:
break;
case H5Z_FILTER_NBIT:
break;
case H5Z_FILTER_SCALEOFFSET:
break;
}/*switch*/
return 1;
}
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