https://github.com/torvalds/linux
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Tip revision: 9cb1fd0efd195590b828b9b865421ad345a4a145 authored by Linus Torvalds on 24 May 2020, 22:32:54 UTC
Linux 5.7-rc7
Tip revision: 9cb1fd0
crc-ccitt.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_CRC_CCITT_H
#define _LINUX_CRC_CCITT_H

#include <linux/types.h>

extern u16 const crc_ccitt_table[256];
extern u16 const crc_ccitt_false_table[256];

extern u16 crc_ccitt(u16 crc, const u8 *buffer, size_t len);
extern u16 crc_ccitt_false(u16 crc, const u8 *buffer, size_t len);

static inline u16 crc_ccitt_byte(u16 crc, const u8 c)
{
	return (crc >> 8) ^ crc_ccitt_table[(crc ^ c) & 0xff];
}

static inline u16 crc_ccitt_false_byte(u16 crc, const u8 c)
{
    return (crc << 8) ^ crc_ccitt_false_table[(crc >> 8) ^ c];
}

#endif /* _LINUX_CRC_CCITT_H */
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