crc16.h revision c4dcb1c10ae5e3d523823fe0a2c84d0841ca2ea1 
19e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek/*
29e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek *	crc16.h - CRC-16 routine
39e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek *
49e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek * Implements the standard CRC-16:
59e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek *   Width 16
69e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek *   Poly  0x8005 (x16 + x15 + x2 + 1)
79e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek *   Init  0
89e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek *
99e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek * Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
109e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek *
119e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek * This source code is licensed under the GNU General Public License,
129e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek * Version 2. See the file COPYING for more details.
139e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek */
149e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek
159e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek#ifndef __CRC16_H
169e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek#define __CRC16_H
179e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek
189e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek#include <ext2fs/ext2_types.h>
19993f1c72913417be7c534ec7a634363cdfc84fa5Ted Kremenek
20993f1c72913417be7c534ec7a634363cdfc84fa5Ted Kremenek/* for an unknown reason, PPC treats __u16 as signed and keeps doing sign
21993f1c72913417be7c534ec7a634363cdfc84fa5Ted Kremenek * extension on the value.  Instead, use only the low 16 bits of an
2222ab7a4d900ed53285fd0b6720e7b43af84724d8Zhongxing Xu * unsigned int for holding the CRC value to avoid this.
23a693d4fa7a6dc31b23837cf38cba7aa2af8f00f3Ted Kremenek */
249e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenektypedef unsigned int crc16_t;
259e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek
26dc0a25d9bff956cdbe54ea0bfc8fbbe3ceb4eb92Zhongxing Xuextern crc16_t ext2fs_crc16(crc16_t crc, const void *buffer, unsigned int len);
27dc0a25d9bff956cdbe54ea0bfc8fbbe3ceb4eb92Zhongxing Xu
289e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek#endif /* __CRC16_H */
299e24049bef26b6289cce9ac9b483c5cbb096e3aeTed Kremenek