| Ivo van Doorn | 3e7cbae | 2006-06-12 16:17:04 +0200 | [diff] [blame] | 1 | /* |
| 2 | * crc-itu-t.h - CRC ITU-T V.41 routine |
| 3 | * |
| 4 | * Implements the standard CRC ITU-T V.41: |
| 5 | * Width 16 |
| 6 | * Poly 0x0x1021 (x^16 + x^12 + x^15 + 1) |
| 7 | * Init 0 |
| 8 | * |
| 9 | * This source code is licensed under the GNU General Public License, |
| 10 | * Version 2. See the file COPYING for more details. |
| 11 | */ |
| 12 | |
| 13 | #ifndef CRC_ITU_T_H |
| 14 | #define CRC_ITU_T_H |
| 15 | |
| 16 | #include <linux/types.h> |
| 17 | |
| 18 | extern u16 const crc_itu_t_table[256]; |
| 19 | |
| 20 | extern u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len); |
| 21 | |
| 22 | static inline u16 crc_itu_t_byte(u16 crc, const u8 data) |
| 23 | { |
| 24 | return (crc << 8) ^ crc_itu_t_table[((crc >> 8) ^ data) & 0xff]; |
| 25 | } |
| 26 | |
| 27 | #endif /* CRC_ITU_T_H */ |
| 28 | |