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/* -*- c-file-style: "stroustrup" -*- */
#include "hdf5.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
//! <!-- [filter] -->
size_t
filter(unsigned int flags, size_t cd_nelmts, const unsigned int cd_values[], size_t nbytes, size_t *buf_size,
void **buf)
{
buf_size = 0;
if (flags & H5Z_FLAG_REVERSE) {
// read data, e.g., decompress data
// ...
}
else {
// write data, e.g., compress data
// ...
}
return nbytes;
}
//! <!-- [filter] -->
int
main(void)
{
int ret_val = EXIT_SUCCESS;
//! <!-- [create] -->
{
__label__ fail_register;
H5Z_class_t cls;
cls.version = H5Z_CLASS_T_VERS;
cls.id = 256;
cls.encoder_present = 1;
cls.decoder_present = 1;
cls.name = "Identity filter";
cls.can_apply = NULL;
cls.set_local = NULL;
cls.filter = &filter;
// register the filter
if (H5Zregister(&cls) < 0) {
ret_val = EXIT_FAILURE;
goto fail_register;
}
// do something with filter
// ...
// unregister the filter if no longer required
// ...
fail_register:;
}
//! <!-- [create] -->
//! <!-- [read] -->
{
__label__ fail_avail;
H5Z_filter_t flt = H5Z_FILTER_DEFLATE;
unsigned flags = 0;
// check if the deflate filter is available
if (H5Zfilter_avail(flt) < 0) {
ret_val = EXIT_FAILURE;
goto fail_avail;
}
// retrieve the deflate filter info
if (H5Zget_filter_info(flt, &flags) < 0) {
ret_val = EXIT_FAILURE;
goto fail_avail;
}
// check if the deflate encoder or decoder is enabled
if (H5Z_FILTER_CONFIG_ENCODE_ENABLED & flags)
printf("Deflate encoder enabled.\n");
if (H5Z_FILTER_CONFIG_DECODE_ENABLED & flags)
printf("Deflate decoder enabled.\n");
fail_avail:;
}
//! <!-- [read] -->
//! <!-- [update] -->
{
// N/A
} //! <!-- [update] -->
//! <!-- [delete] -->
{
// unregister the identity filter
if (H5Zunregister(256) < 0) {
ret_val = EXIT_FAILURE;
}
}
//! <!-- [delete] -->
assert(ret_val == EXIT_SUCCESS);
return ret_val;
}
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