| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | /* |
| 3 | * crc-itu-t.h - CRC ITU-T V.41 routine |
| 4 | * |
| 5 | * Implements the standard CRC ITU-T V.41: |
| 6 | * Width 16 |
| 7 | * Poly 0x1021 (x^16 + x^12 + x^15 + 1) |
| 8 | * Init 0 |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | #ifndef CRC_ITU_T_H |
| 12 | #define CRC_ITU_T_H |
| 13 | |
| 14 | #include <linux/types.h> |
| 15 | |
| 16 | extern u16 const crc_itu_t_table[256]; |
| 17 | |
| 18 | extern u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len); |
| 19 | |
| 20 | static inline u16 crc_itu_t_byte(u16 crc, const u8 data) |
| 21 | { |
| 22 | return (crc << 8) ^ crc_itu_t_table[((crc >> 8) ^ data) & 0xff]; |
| 23 | } |
| 24 | |
| 25 | #endif /* CRC_ITU_T_H */ |
| 26 | |