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/* $Id$
*
* Provides routines for encoding and decoding the extended Golay
* (24,12,8) code.
*
* This implementation will detect up to 4 errors in a codeword (without
* being able to correct them); it will correct up to 3 errors.
*
* We use guint32s to hold the 24-bit codewords, with the data part in
* the bottom 12 bits and the parity in bits 12-23.
*
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef __GOLAY_H__
#define __GOLAY_H__
/* encodes a 12-bit word to a 24-bit codeword
*/
guint32 golay_encode(guint w);
/* return a mask showing the bits which are in error in a received
* 24-bit codeword, or -1 if 4 errors were detected.
*/
gint32 golay_errors(guint32 codeword);
/* decode a received codeword. Up to 3 errors are corrected for; 4
errors are detected as uncorrectable (return -1); 5 or more errors
cause an incorrect correction.
*/
gint golay_decode(guint32 w);
#endif
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