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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. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* 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_FLETCHER32 3 /*fletcher32 checksum of EDC */
#define H5Z_FILTER_SZIP 4 /*szip compression */
#define H5Z_FILTER_RESERVED 256 /*filter ids below this value are reserved */
#define H5Z_FILTER_MAX 65535 /*maximum filter id */
#define H5Z_MAX_NFILTERS 32 /* Maximum number of filters allowed in a pipeline (should probably be allowed to be an unlimited amount) */
/* Flags for filter definition */
#define H5Z_FLAG_DEFMASK 0x00ff /*definition flag mask */
#define H5Z_FLAG_MANDATORY 0x0000 /*filter is mandatory */
#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 */
#define H5Z_FLAG_SKIP_EDC 0x0200 /*skip EDC filters for read */
/* Special parameters for szip compression */
#ifdef H5_HAVE_FILTER_SZIP
#define H5_SZIP_RAW_OPTION_MASK 128
#define H5_SZIP_NN_OPTION_MASK 32
#endif /* H5_HAVE_FILTER_SZIP */
/* Values to decide if EDC is enabled for reading data */
typedef enum H5Z_EDC_t {
H5Z_ERROR_EDC = -1, /* error value */
H5Z_DISABLE_EDC = 0,
H5Z_ENABLE_EDC = 1,
H5Z_NO_EDC = 2 /* must be the last */
} H5Z_EDC_t;
/* Return values for filter callback function */
typedef enum H5Z_cb_return_t {
H5Z_CB_ERROR = -1,
H5Z_CB_FAIL = 0, /* I/O should fail if filter fails. */
H5Z_CB_CONT = 1, /* I/O continues if filter fails. */
H5Z_CB_NO = 2
} H5Z_cb_return_t;
/* Filter callback function definition */
typedef H5Z_cb_return_t (*H5Z_filter_func_t)(H5Z_filter_t filter, void* buf,
size_t buf_size, void* op_data);
/* Structure for filter callback property */
typedef struct H5Z_cb_t {
H5Z_filter_func_t func;
void* op_data;
} H5Z_cb_t;
#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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