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 Sourcecode: vdmfec version 1.01.0-11.0-2

# fec.h

/*
* fec.c -- forward error correction based on Vandermonde matrices
* 980614
* (C) 1997-98 Luigi Rizzo (luigi@iet.unipi.it)
*
* Portions derived from code by Phil Karn (karn@ka9q.ampr.org),
* Robert Morelos-Zaragoza (robert@spectra.eng.hawaii.edu) and Hari
* Thirumoorthy (harit@spectra.eng.hawaii.edu), Aug 1995
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:

* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
*    copyright notice, this list of conditions and the following
*    disclaimer in the documentation and/or other materials
*    provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/

/*
* The following parameter defines how many bits are used for
* field elements. The code supports any value from 2 to 16
* but fastest operation is achieved with 8 bit elements
* This is the only parameter you may want to change.
*/
#ifndef GF_BITS
#define GF_BITS  8      /* code over GF(2**GF_BITS) - change to suit */
#endif

#define GF_SIZE ((1 << GF_BITS) - 1)    /* powers of \alpha */

void *fec_new(int k, int n);
void fec_free(void *p);

void fec_encode(void *code, u_char **src, u_char *dst, int index, int sz);
int fec_decode(void *code, u_char **pkt, int *index, int sz);


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