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0b73ce30 BM |
1 | /* |
2 | * CRC16 (CCITT) Checksum Algorithm | |
3 | * | |
4 | * Copyright (c) 2021 Wind River Systems, Inc. | |
5 | * | |
6 | * Author: | |
7 | * Bin Meng <bin.meng@windriver.com> | |
8 | * | |
9 | * From Linux kernel v5.10 include/linux/crc-ccitt.h | |
10 | * | |
11 | * SPDX-License-Identifier: GPL-2.0 | |
12 | */ | |
13 | ||
9c092804 MA |
14 | #ifndef CRC_CCITT_H |
15 | #define CRC_CCITT_H | |
0b73ce30 BM |
16 | |
17 | extern uint16_t const crc_ccitt_table[256]; | |
18 | extern uint16_t const crc_ccitt_false_table[256]; | |
19 | ||
f703f1ef PMD |
20 | uint16_t crc_ccitt(uint16_t crc, const uint8_t *buffer, size_t len); |
21 | uint16_t crc_ccitt_false(uint16_t crc, const uint8_t *buffer, size_t len); | |
0b73ce30 BM |
22 | |
23 | static inline uint16_t crc_ccitt_byte(uint16_t crc, const uint8_t c) | |
24 | { | |
25 | return (crc >> 8) ^ crc_ccitt_table[(crc ^ c) & 0xff]; | |
26 | } | |
27 | ||
28 | static inline uint16_t crc_ccitt_false_byte(uint16_t crc, const uint8_t c) | |
29 | { | |
30 | return (crc << 8) ^ crc_ccitt_false_table[(crc >> 8) ^ c]; | |
31 | } | |
32 | ||
9c092804 | 33 | #endif /* CRC_CCITT_H */ |