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