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1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2015 Aurelien Jacobs <aurel@gnuage.org> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <config.h> | |
21 | #include <stdint.h> | |
22 | #include <libsigrok/libsigrok.h> | |
23 | #include "libsigrok-internal.h" | |
24 | ||
25 | SR_PRIV uint16_t sr_crc16(uint16_t crc, const uint8_t *buffer, int len) | |
26 | { | |
27 | int i; | |
28 | ||
29 | if (!buffer || len < 0) | |
30 | return crc; | |
31 | ||
32 | while (len--) { | |
33 | crc ^= *buffer++; | |
34 | for (i = 0; i < 8; i++) { | |
35 | int carry = crc & 1; | |
36 | crc >>= 1; | |
37 | if (carry) | |
38 | crc ^= 0xA001; | |
39 | } | |
40 | } | |
41 | ||
42 | return crc; | |
43 | } |