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| Commit | Line | Data |
|---|---|---|
| 3e7cbae7 ID |
1 | /* |
| 2 | * crc-itu-t.c | |
| 3 | * | |
| 4 | * This source code is licensed under the GNU General Public License, | |
| 5 | * Version 2. See the file COPYING for more details. | |
| 6 | */ | |
| 7 | ||
| 8 | #include <linux/types.h> | |
| 9 | #include <linux/module.h> | |
| 10 | #include <linux/crc-itu-t.h> | |
| 11 | ||
| 12 | /** CRC table for the CRC ITU-T V.41 0x0x1021 (x^16 + x^12 + x^15 + 1) */ | |
| 13 | const u16 crc_itu_t_table[256] = { | |
| 14 | 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, | |
| 15 | 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, | |
| 16 | 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, | |
| 17 | 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, | |
| 18 | 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, | |
| 19 | 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, | |
| 20 | 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, | |
| 21 | 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, | |
| 22 | 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, | |
| 23 | 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, | |
| 24 | 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, | |
| 25 | 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, | |
| 26 | 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, | |
| 27 | 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, | |
| 28 | 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, | |
| 29 | 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, | |
| 30 | 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, | |
| 31 | 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, | |
| 32 | 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, | |
| 33 | 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, | |
| 34 | 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, | |
| 35 | 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, | |
| 36 | 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, | |
| 37 | 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, | |
| 38 | 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, | |
| 39 | 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, | |
| 40 | 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, | |
| 41 | 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, | |
| 42 | 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, | |
| 43 | 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, | |
| 44 | 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, | |
| 45 | 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 | |
| 46 | }; | |
| 47 | ||
| 48 | EXPORT_SYMBOL(crc_itu_t_table); | |
| 49 | ||
| 50 | /** | |
| 51 | * crc_itu_t - Compute the CRC-ITU-T for the data buffer | |
| 52 | * | |
| 53 | * @crc: previous CRC value | |
| 54 | * @buffer: data pointer | |
| 55 | * @len: number of bytes in the buffer | |
| 56 | * | |
| 57 | * Returns the updated CRC value | |
| 58 | */ | |
| 59 | u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len) | |
| 60 | { | |
| 61 | while (len--) | |
| 62 | crc = crc_itu_t_byte(crc, *buffer++); | |
| 63 | return crc; | |
| 64 | } | |
| 65 | EXPORT_SYMBOL(crc_itu_t); | |
| 66 | ||
| 67 | MODULE_DESCRIPTION("CRC ITU-T V.41 calculations"); | |
| 68 | MODULE_LICENSE("GPL"); | |
| 69 |