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72 lines
2.9 KiB
C
72 lines
2.9 KiB
C
/*
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This is a simple Reed-Solomon encoder
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(C) Cliff Hones 2004
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the project nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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*/
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/* vim: set ts=4 sw=4 et : */
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#ifndef __REEDSOL_H
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#define __REEDSOL_H
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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typedef struct {
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const unsigned char *logt; /* These are static */
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const unsigned char *alog;
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unsigned char rspoly[256];
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int nsym;
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} rs_t;
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typedef struct {
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unsigned int *logt; /* These are malloced */
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unsigned int *alog;
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unsigned short rspoly[4096]; /* 12-bit max - needs to be enlarged if > 12-bit used */
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int nsym;
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} rs_uint_t;
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INTERNAL void rs_init_gf(rs_t *rs, const unsigned int prime_poly);
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INTERNAL void rs_init_code(rs_t *rs, const int nsym, int index);
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INTERNAL void rs_encode(const rs_t *rs, const int datalen, const unsigned char *data, unsigned char *res);
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INTERNAL void rs_encode_uint(const rs_t *rs, const int datalen, const unsigned int *data, unsigned int *res);
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/* No free needed as log tables static */
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INTERNAL int rs_uint_init_gf(rs_uint_t *rs_uint, const unsigned int prime_poly, const int logmod);
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INTERNAL void rs_uint_init_code(rs_uint_t *rs_uint, const int nsym, int index);
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INTERNAL void rs_uint_encode(const rs_uint_t *rs_uint, const int datalen, const unsigned int *data,
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unsigned int *res);
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INTERNAL void rs_uint_free(rs_uint_t *rs_uint);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __REEDSOL_H */
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