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Diffstat (limited to '')
| -rw-r--r-- | wsutil/crc8.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/wsutil/crc8.c b/wsutil/crc8.c new file mode 100644 index 0000000..ae15026 --- /dev/null +++ b/wsutil/crc8.c @@ -0,0 +1,204 @@ +/* crc8.c + * Implementation CRC-8 declarations and routines + * + * 2011 Roland Knall <rknall@gmail.com> + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + + +#include "config.h" + +#include <wsutil/crc8.h> + +/* @brief Precompiled table for CRC8 values for the polynom 0x2F */ +static const uint8_t crc8_precompiled_2F[256] = +{ + 0x00, 0x2F, 0x5E, 0x71, 0xBC, 0x93, 0xE2, 0xCD, + 0x57, 0x78, 0x09, 0x26, 0xEB, 0xC4, 0xB5, 0x9A, + 0xAE, 0x81, 0xF0, 0xDF, 0x12, 0x3D, 0x4C, 0x63, + 0xF9, 0xD6, 0xA7, 0x88, 0x45, 0x6A, 0x1B, 0x34, + 0x73, 0x5C, 0x2D, 0x02, 0xCF, 0xE0, 0x91, 0xBE, + 0x24, 0x0B, 0x7A, 0x55, 0x98, 0xB7, 0xC6, 0xE9, + 0xDD, 0xF2, 0x83, 0xAC, 0x61, 0x4E, 0x3F, 0x10, + 0x8A, 0xA5, 0xD4, 0xFB, 0x36, 0x19, 0x68, 0x47, + 0xE6, 0xC9, 0xB8, 0x97, 0x5A, 0x75, 0x04, 0x2B, + 0xB1, 0x9E, 0xEF, 0xC0, 0x0D, 0x22, 0x53, 0x7C, + 0x48, 0x67, 0x16, 0x39, 0xF4, 0xDB, 0xAA, 0x85, + 0x1F, 0x30, 0x41, 0x6E, 0xA3, 0x8C, 0xFD, 0xD2, + 0x95, 0xBA, 0xCB, 0xE4, 0x29, 0x06, 0x77, 0x58, + 0xC2, 0xED, 0x9C, 0xB3, 0x7E, 0x51, 0x20, 0x0F, + 0x3B, 0x14, 0x65, 0x4A, 0x87, 0xA8, 0xD9, 0xF6, + 0x6C, 0x43, 0x32, 0x1D, 0xD0, 0xFF, 0x8E, 0xA1, + 0xE3, 0xCC, 0xBD, 0x92, 0x5F, 0x70, 0x01, 0x2E, + 0xB4, 0x9B, 0xEA, 0xC5, 0x08, 0x27, 0x56, 0x79, + 0x4D, 0x62, 0x13, 0x3C, 0xF1, 0xDE, 0xAF, 0x80, + 0x1A, 0x35, 0x44, 0x6B, 0xA6, 0x89, 0xF8, 0xD7, + 0x90, 0xBF, 0xCE, 0xE1, 0x2C, 0x03, 0x72, 0x5D, + 0xC7, 0xE8, 0x99, 0xB6, 0x7B, 0x54, 0x25, 0x0A, + 0x3E, 0x11, 0x60, 0x4F, 0x82, 0xAD, 0xDC, 0xF3, + 0x69, 0x46, 0x37, 0x18, 0xD5, 0xFA, 0x8B, 0xA4, + 0x05, 0x2A, 0x5B, 0x74, 0xB9, 0x96, 0xE7, 0xC8, + 0x52, 0x7D, 0x0C, 0x23, 0xEE, 0xC1, 0xB0, 0x9F, + 0xAB, 0x84, 0xF5, 0xDA, 0x17, 0x38, 0x49, 0x66, + 0xFC, 0xD3, 0xA2, 0x8D, 0x40, 0x6F, 0x1E, 0x31, + 0x76, 0x59, 0x28, 0x07, 0xCA, 0xE5, 0x94, 0xBB, + 0x21, 0x0E, 0x7F, 0x50, 0x9D, 0xB2, 0xC3, 0xEC, + 0xD8, 0xF7, 0x86, 0xA9, 0x64, 0x4B, 0x3A, 0x15, + 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 + * @param len the length of the given buffer + * @param seed The seed to use. + * @param crc_table a table storing 256 entries for crc8 checksums + * @return the CRC8 checksum for the buffer + */ +static uint8_t crc8_precompiled(const uint8_t *buf, uint32_t len, uint8_t seed, const uint8_t crc_table[]) +{ + uint8_t crc; + + crc = seed; + while(len-- > 0) + crc = crc_table[(uint8_t)(*buf++) ^ crc]; + + return crc; +} + +/** Calculates a CRC8 checksum for the given buffer with the polynom + * 0x2F 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 + */ +uint8_t crc8_0x2F(const uint8_t *buf, uint32_t len, uint8_t 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 + */ +uint8_t crc8_0x37(const uint8_t *buf, uint32_t len, uint8_t seed) +{ + uint8_t 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 + */ +uint8_t crc8_0x3B(const uint8_t *buf, uint32_t len, uint8_t seed) +{ + uint8_t crc = seed; + while (len-- > 0) + { + crc = crc8_precompiled_3b[(crc ^ *buf++)]; + } + return (crc); +} + +/* + * Editor modelines - https://www.wireshark.org/tools/modelines.html + * + * Local variables: + * c-basic-offset: 4 + * tab-width: 8 + * indent-tabs-mode: nil + * End: + * + * vi: set shiftwidth=4 tabstop=8 expandtab: + * :indentSize=4:tabSize=8:noTabs=true: + */ |