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golay.h

/* $Id: golay.h 22603 2007-08-23 17:25:22Z richardv $
 *
 * 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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