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50 lines
2.1 KiB
C
50 lines
2.1 KiB
C
// Reed-Solomon encoding/erasure decoding
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// Implementation of the algorithms described in
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// Efficient erasure decoding of Reed-Solomon codes
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// http://arxiv.org/abs/0901.1886v1
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// (c) 2009 Frederic didier.
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// Any feedback is very welcome. For any question, comments,
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// see http://algo.epfl.ch/~didier/reed_solomon.html or email
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// frederic.didier@epfl.ch
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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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//
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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
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials
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// provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS
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// BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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// OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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// TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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// OF SUCH DAMAGE.
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// type used to store one field symbol
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// With short int, we can work up to GF(16)
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// If one wants to work on bigger fied, replace this by int.
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typedef unsigned short symbol;
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typedef unsigned char byte;
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// Common initialisation functions
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extern void code_init(int n_field, int n_walsh);
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extern void code_clear();
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extern void encode_init(int K);
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extern void fast_encode(int N, int K, int S, symbol *data, symbol *packets);
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extern void fast_decode(int K, int S, int *positions, symbol *data, symbol *packets);
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