50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* $Id$
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*
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* Provides routines for encoding and decoding the extended Golay
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* (24,12,8) code.
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*
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* This implementation will detect up to 4 errors in a codeword (without
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* being able to correct them); it will correct up to 3 errors.
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*
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* We use guint32s to hold the 24-bit codewords, with the data part in
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* the bottom 12 bits and the parity in bits 12-23.
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*
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __GOLAY_H__
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#define __GOLAY_H__
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/* encodes a 12-bit word to a 24-bit codeword
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*/
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guint32 golay_encode(guint w);
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/* return a mask showing the bits which are in error in a received
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* 24-bit codeword, or -1 if 4 errors were detected.
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*/
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gint32 golay_errors(guint32 codeword);
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/* decode a received codeword. Up to 3 errors are corrected for; 4
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errors are detected as uncorrectable (return -1); 5 or more errors
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cause an incorrect correction.
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*/
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gint golay_decode(guint32 w);
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#endif
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