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3e7cbae7 ID |
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 | |
94268fcd | 6 | * Poly 0x1021 (x^16 + x^12 + x^15 + 1) |
3e7cbae7 ID |
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 |