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Commit | Line | Data |
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1 | /* | |
2 | * Copyright (c) 2013 Google, Inc | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0+ | |
5 | */ | |
6 | ||
7 | #include "linux/crc8.h" | |
8 | ||
9 | #define POLY (0x1070U << 3) | |
10 | ||
11 | static unsigned char _crc8(unsigned short data) | |
12 | { | |
13 | int i; | |
14 | ||
15 | for (i = 0; i < 8; i++) { | |
16 | if (data & 0x8000) | |
17 | data = data ^ POLY; | |
18 | data = data << 1; | |
19 | } | |
20 | ||
21 | return (unsigned char)(data >> 8); | |
22 | } | |
23 | ||
24 | unsigned int crc8(unsigned int crc, const unsigned char *vptr, int len) | |
25 | { | |
26 | int i; | |
27 | ||
28 | for (i = 0; i < len; i++) | |
29 | crc = _crc8((crc ^ vptr[i]) << 8); | |
30 | ||
31 | return crc; | |
32 | } |