34 lines
841 B
C
34 lines
841 B
C
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/*
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* CRC16 (CCITT) Checksum Algorithm
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*
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* Copyright (c) 2021 Wind River Systems, Inc.
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*
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* Author:
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* Bin Meng <bin.meng@windriver.com>
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*
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* From Linux kernel v5.10 include/linux/crc-ccitt.h
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#ifndef _CRC_CCITT_H
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#define _CRC_CCITT_H
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extern uint16_t const crc_ccitt_table[256];
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extern uint16_t const crc_ccitt_false_table[256];
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extern uint16_t crc_ccitt(uint16_t crc, const uint8_t *buffer, size_t len);
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extern uint16_t crc_ccitt_false(uint16_t crc, const uint8_t *buffer, size_t len);
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static inline uint16_t crc_ccitt_byte(uint16_t crc, const uint8_t c)
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{
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return (crc >> 8) ^ crc_ccitt_table[(crc ^ c) & 0xff];
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}
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static inline uint16_t crc_ccitt_false_byte(uint16_t crc, const uint8_t c)
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{
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return (crc << 8) ^ crc_ccitt_false_table[(crc >> 8) ^ c];
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}
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#endif /* _CRC_CCITT_H */
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