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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. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include "hdf5.h"
/*-------------------------------------------------------------------------
* print a warning message
*-------------------------------------------------------------------------
*/
static void print_warning(const char *dname, const char *fname)
{
printf("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 have_deflate=0; /* assume initially we do not have filters */
int have_szip=0;
int have_shuffle=0;
int have_fletcher=0;
#ifdef H5_HAVE_FILTER_DEFLATE
have_deflate=1;
#endif
#ifdef H5_HAVE_FILTER_SZIP
have_szip=1;
#endif
#ifdef H5_HAVE_FILTER_SHUFFLE
have_shuffle=1;
#endif
#ifdef H5_HAVE_FILTER_FLETCHER32
have_fletcher=1;
#endif
/* 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_filter(dcpl_id,(unsigned)i,0,0,0,0,0))<0)
return -1;
switch (filtn)
{
default:
break;
/*-------------------------------------------------------------------------
* H5Z_FILTER_DEFLATE 1 , deflation like gzip
*-------------------------------------------------------------------------
*/
case H5Z_FILTER_DEFLATE:
if (!have_deflate)
{
if (name)
print_warning(name,"deflate");
return 0;
}
break;
/*-------------------------------------------------------------------------
* H5Z_FILTER_SZIP 4 , szip compression
*-------------------------------------------------------------------------
*/
case H5Z_FILTER_SZIP:
if (!have_szip)
{
if (name)
print_warning(name,"SZIP");
return 0;
}
break;
/*-------------------------------------------------------------------------
* H5Z_FILTER_SHUFFLE 2 , shuffle the data
*-------------------------------------------------------------------------
*/
case H5Z_FILTER_SHUFFLE:
if (!have_szip)
{
if (name)
print_warning(name,"shuffle");
return 0;
}
break;
/*-------------------------------------------------------------------------
* H5Z_FILTER_FLETCHER32 3 , fletcher32 checksum of EDC
*-------------------------------------------------------------------------
*/
case H5Z_FILTER_FLETCHER32:
if (!have_fletcher)
{
if (name)
print_warning(name,"fletcher32");
return 0;
}
break;
}/*switch*/
}/*for*/
return 1;
}
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