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