diff options
Diffstat (limited to 'wsutil/crc8.c')
| -rw-r--r-- | wsutil/crc8.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/wsutil/crc8.c b/wsutil/crc8.c index 1fbf045c70..d667f57e90 100644 --- a/wsutil/crc8.c +++ b/wsutil/crc8.c @@ -65,7 +65,79 @@ static const guint8 crc8_precompiled_2F[256] = 0x8F, 0xA0, 0xD1, 0xFE, 0x33, 0x1C, 0x6D, 0x42 }; +/* @brief Precompiled table for CRC8 values for the polynom 0x37 */ +static const unsigned char crc8_precompiled_37[256] = +{ + 0x00, 0x37, 0x6e, 0x59, 0xdc, 0xeb, 0xb2, 0x85, + 0x8f, 0xb8, 0xe1, 0xd6, 0x53, 0x64, 0x3d, 0x0a, + 0x29, 0x1e, 0x47, 0x70, 0xf5, 0xc2, 0x9b, 0xac, + 0xa6, 0x91, 0xc8, 0xff, 0x7a, 0x4d, 0x14, 0x23, + 0x52, 0x65, 0x3c, 0x0b, 0x8e, 0xb9, 0xe0, 0xd7, + 0xdd, 0xea, 0xb3, 0x84, 0x01, 0x36, 0x6f, 0x58, + 0x7b, 0x4c, 0x15, 0x22, 0xa7, 0x90, 0xc9, 0xfe, + 0xf4, 0xc3, 0x9a, 0xad, 0x28, 0x1f, 0x46, 0x71, + 0xa4, 0x93, 0xca, 0xfd, 0x78, 0x4f, 0x16, 0x21, + 0x2b, 0x1c, 0x45, 0x72, 0xf7, 0xc0, 0x99, 0xae, + 0x8d, 0xba, 0xe3, 0xd4, 0x51, 0x66, 0x3f, 0x08, + 0x02, 0x35, 0x6c, 0x5b, 0xde, 0xe9, 0xb0, 0x87, + 0xf6, 0xc1, 0x98, 0xaf, 0x2a, 0x1d, 0x44, 0x73, + 0x79, 0x4e, 0x17, 0x20, 0xa5, 0x92, 0xcb, 0xfc, + 0xdf, 0xe8, 0xb1, 0x86, 0x03, 0x34, 0x6d, 0x5a, + 0x50, 0x67, 0x3e, 0x09, 0x8c, 0xbb, 0xe2, 0xd5, + 0x7f, 0x48, 0x11, 0x26, 0xa3, 0x94, 0xcd, 0xfa, + 0xf0, 0xc7, 0x9e, 0xa9, 0x2c, 0x1b, 0x42, 0x75, + 0x56, 0x61, 0x38, 0x0f, 0x8a, 0xbd, 0xe4, 0xd3, + 0xd9, 0xee, 0xb7, 0x80, 0x05, 0x32, 0x6b, 0x5c, + 0x2d, 0x1a, 0x43, 0x74, 0xf1, 0xc6, 0x9f, 0xa8, + 0xa2, 0x95, 0xcc, 0xfb, 0x7e, 0x49, 0x10, 0x27, + 0x04, 0x33, 0x6a, 0x5d, 0xd8, 0xef, 0xb6, 0x81, + 0x8b, 0xbc, 0xe5, 0xd2, 0x57, 0x60, 0x39, 0x0e, + 0xdb, 0xec, 0xb5, 0x82, 0x07, 0x30, 0x69, 0x5e, + 0x54, 0x63, 0x3a, 0x0d, 0x88, 0xbf, 0xe6, 0xd1, + 0xf2, 0xc5, 0x9c, 0xab, 0x2e, 0x19, 0x40, 0x77, + 0x7d, 0x4a, 0x13, 0x24, 0xa1, 0x96, 0xcf, 0xf8, + 0x89, 0xbe, 0xe7, 0xd0, 0x55, 0x62, 0x3b, 0x0c, + 0x06, 0x31, 0x68, 0x5f, 0xda, 0xed, 0xb4, 0x83, + 0xa0, 0x97, 0xce, 0xf9, 0x7c, 0x4b, 0x12, 0x25, + 0x2f, 0x18, 0x41, 0x76, 0xf3, 0xc4, 0x9d, 0xaa, +}; +/* @brief Precompiled table for CRC8 values for the polynom 0x3B */ +static const unsigned char crc8_precompiled_3b[256] = +{ + 0x00, 0x3b, 0x76, 0x4d, 0xec, 0xd7, 0x9a, 0xa1, + 0xe3, 0xd8, 0x95, 0xae, 0x0f, 0x34, 0x79, 0x42, + 0xfd, 0xc6, 0x8b, 0xb0, 0x11, 0x2a, 0x67, 0x5c, + 0x1e, 0x25, 0x68, 0x53, 0xf2, 0xc9, 0x84, 0xbf, + 0xc1, 0xfa, 0xb7, 0x8c, 0x2d, 0x16, 0x5b, 0x60, + 0x22, 0x19, 0x54, 0x6f, 0xce, 0xf5, 0xb8, 0x83, + 0x3c, 0x07, 0x4a, 0x71, 0xd0, 0xeb, 0xa6, 0x9d, + 0xdf, 0xe4, 0xa9, 0x92, 0x33, 0x08, 0x45, 0x7e, + 0xb9, 0x82, 0xcf, 0xf4, 0x55, 0x6e, 0x23, 0x18, + 0x5a, 0x61, 0x2c, 0x17, 0xb6, 0x8d, 0xc0, 0xfb, + 0x44, 0x7f, 0x32, 0x09, 0xa8, 0x93, 0xde, 0xe5, + 0xa7, 0x9c, 0xd1, 0xea, 0x4b, 0x70, 0x3d, 0x06, + 0x78, 0x43, 0x0e, 0x35, 0x94, 0xaf, 0xe2, 0xd9, + 0x9b, 0xa0, 0xed, 0xd6, 0x77, 0x4c, 0x01, 0x3a, + 0x85, 0xbe, 0xf3, 0xc8, 0x69, 0x52, 0x1f, 0x24, + 0x66, 0x5d, 0x10, 0x2b, 0x8a, 0xb1, 0xfc, 0xc7, + 0x49, 0x72, 0x3f, 0x04, 0xa5, 0x9e, 0xd3, 0xe8, + 0xaa, 0x91, 0xdc, 0xe7, 0x46, 0x7d, 0x30, 0x0b, + 0xb4, 0x8f, 0xc2, 0xf9, 0x58, 0x63, 0x2e, 0x15, + 0x57, 0x6c, 0x21, 0x1a, 0xbb, 0x80, 0xcd, 0xf6, + 0x88, 0xb3, 0xfe, 0xc5, 0x64, 0x5f, 0x12, 0x29, + 0x6b, 0x50, 0x1d, 0x26, 0x87, 0xbc, 0xf1, 0xca, + 0x75, 0x4e, 0x03, 0x38, 0x99, 0xa2, 0xef, 0xd4, + 0x96, 0xad, 0xe0, 0xdb, 0x7a, 0x41, 0x0c, 0x37, + 0xf0, 0xcb, 0x86, 0xbd, 0x1c, 0x27, 0x6a, 0x51, + 0x13, 0x28, 0x65, 0x5e, 0xff, 0xc4, 0x89, 0xb2, + 0x0d, 0x36, 0x7b, 0x40, 0xe1, 0xda, 0x97, 0xac, + 0xee, 0xd5, 0x98, 0xa3, 0x02, 0x39, 0x74, 0x4f, + 0x31, 0x0a, 0x47, 0x7c, 0xdd, 0xe6, 0xab, 0x90, + 0xd2, 0xe9, 0xa4, 0x9f, 0x3e, 0x05, 0x48, 0x73, + 0xcc, 0xf7, 0xba, 0x81, 0x20, 0x1b, 0x56, 0x6d, + 0x2f, 0x14, 0x59, 0x62, 0xc3, 0xf8, 0xb5, 0x8e, +}; /** Calculates a CRC8 checksum for the given buffer with the polynom * stored in the crc_table * @param buf a pointer to a buffer of the given length @@ -97,6 +169,40 @@ guint8 crc8_0x2F(guint8 *buf, guint32 len, guint8 seed) return crc8_precompiled(buf, len, seed, crc8_precompiled_2F); } +/** Calculates a CRC8 checksum for the given buffer with the polynom + * 0x37 using the precompiled CRC table + * @param buf a pointer to a buffer of the given length + * @param len the length of the given buffer + * @param seed The seed to use. + * @return the CRC8 checksum for the buffer + */ +guint8 crc8_0x37(guint8 *buf, guint32 len, guint8 seed) +{ + guint8 crc = seed; + while (len-- > 0) + { + crc = crc8_precompiled_37[(crc ^ *buf++)]; + } + return (crc); +} + +/** Calculates a CRC8 checksum for the given buffer with the polynom + * 0x3B using the precompiled CRC table + * @param buf a pointer to a buffer of the given length + * @param len the length of the given buffer + * @param seed The seed to use. + * @return the CRC8 checksum for the buffer + */ +guint8 crc8_0x3B(guint8 *buf, guint32 len, guint8 seed) +{ + guint8 crc = seed; + while (len-- > 0) + { + crc = crc8_precompiled_3b[(crc ^ *buf++)]; + } + return (crc); +} + /* * Editor modelines - http://www.wireshark.org/tools/modelines.html * |