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/*
* Copyright (C) 1998 NCSA
* All rights reserved.
*
* Programmer: Robb Matzke <matzke@llnl.gov>
* Thursday, April 16, 1998
*/
#ifndef _H5Zpublic_H
#define _H5Zpublic_H
/*
* Filter identifiers. Values 0 through 255 are for filters defined by the
* HDF5 library. Values 256 through 511 are available for testing new
* filters. Subsequent values should be obtained from the HDF5 development
* team at hdf5dev@ncsa.uiuc.edu. These values will never change because they
* appear in the HDF5 files.
*/
typedef int H5Z_filter_t;
#define H5Z_FILTER_ERROR (-1) /*no filter */
#define H5Z_FILTER_NONE 0 /*reserved indefinitely */
#define H5Z_FILTER_DEFLATE 1 /*deflation like gzip */
#define H5Z_FILTER_SHUFFLE 2 /* shuffle the data */
#define H5Z_FILTER_RESERVED 256 /*filter ids below this value are reserved */
#define H5Z_FILTER_MAX 65535 /*maximum filter id */
/* Flags for filter definition */
#define H5Z_FLAG_DEFMASK 0x00ff /*definition flag mask */
#define H5Z_FLAG_OPTIONAL 0x0001 /*filter is optional */
/* Additional flags for filter invocation */
#define H5Z_FLAG_INVMASK 0xff00 /*invocation flag mask */
#define H5Z_FLAG_REVERSE 0x0100 /*reverse direction; read */
#ifdef __cplusplus
extern "C" {
#endif
/*
* A filter gets definition flags and invocation flags (defined above), the
* client data array and size defined when the filter was added to the
* pipeline, the size in bytes of the data on which to operate, and pointers
* to a buffer and its allocated size.
*
* The filter should store the result in the supplied buffer if possible,
* otherwise it can allocate a new buffer, freeing the original. The
* allocated size of the new buffer should be returned through the BUF_SIZE
* pointer and the new buffer through the BUF pointer.
*
* The return value from the filter is the number of bytes in the output
* buffer. If an error occurs then the function should return zero and leave
* all pointer arguments unchanged.
*/
typedef size_t (*H5Z_func_t)(unsigned int flags, size_t cd_nelmts,
const unsigned int cd_values[], size_t nbytes,
size_t *buf_size, void **buf);
H5_DLL herr_t H5Zregister(H5Z_filter_t id, const char *comment,
H5Z_func_t filter);
H5_DLL herr_t H5Zunregister(H5Z_filter_t id);
H5_DLL htri_t H5Zfilter_avail(H5Z_filter_t id);
#ifdef __cplusplus
}
#endif
#endif
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