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1e154bdb JA |
1 | /* |
2 | * crc7.c | |
3 | * | |
4 | * This source code is licensed under the GNU General Public License, | |
5 | * Version 2. See the file COPYING for more details. | |
6 | */ | |
7 | ||
8 | #include "crc7.h" | |
9 | ||
10 | /* Table for CRC-7 (polynomial x^7 + x^3 + 1) */ | |
11 | const unsigned char crc7_syndrome_table[256] = { | |
12 | 0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f, | |
13 | 0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77, | |
14 | 0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26, | |
15 | 0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e, | |
16 | 0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d, | |
17 | 0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45, | |
18 | 0x2b, 0x22, 0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14, | |
19 | 0x63, 0x6a, 0x71, 0x78, 0x47, 0x4e, 0x55, 0x5c, | |
20 | 0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49, 0x52, 0x5b, | |
21 | 0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13, | |
22 | 0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42, | |
23 | 0x35, 0x3c, 0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a, | |
24 | 0x56, 0x5f, 0x44, 0x4d, 0x72, 0x7b, 0x60, 0x69, | |
25 | 0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33, 0x28, 0x21, | |
26 | 0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70, | |
27 | 0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38, | |
28 | 0x41, 0x48, 0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e, | |
29 | 0x09, 0x00, 0x1b, 0x12, 0x2d, 0x24, 0x3f, 0x36, | |
30 | 0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75, 0x6e, 0x67, | |
31 | 0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f, | |
32 | 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c, | |
33 | 0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04, | |
34 | 0x6a, 0x63, 0x78, 0x71, 0x4e, 0x47, 0x5c, 0x55, | |
35 | 0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f, 0x14, 0x1d, | |
36 | 0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a, | |
37 | 0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52, | |
38 | 0x3c, 0x35, 0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03, | |
39 | 0x74, 0x7d, 0x66, 0x6f, 0x50, 0x59, 0x42, 0x4b, | |
40 | 0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a, 0x21, 0x28, | |
41 | 0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60, | |
42 | 0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31, | |
43 | 0x46, 0x4f, 0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79 | |
44 | }; | |
45 | ||
25dfa848 | 46 | unsigned char fio_crc7(const unsigned char *buffer, unsigned int len) |
1e154bdb JA |
47 | { |
48 | unsigned char crc = 0; | |
49 | ||
50 | while (len--) | |
51 | crc = crc7_byte(crc, *buffer++); | |
52 | return crc; | |
53 | } |