1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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^5 + 1) |
8 | * Init 0 |
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 | |
27 | |