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40b0b3f8 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
3e7cbae7 ID |
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 | |
94268fcd | 7 | * Poly 0x1021 (x^16 + x^12 + x^15 + 1) |
3e7cbae7 | 8 | * Init 0 |
3e7cbae7 ID |
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 |