[linux-block.git] / include / linux / 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 */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _LINUX_CRC_CCITT_H
1da177e4 LT	3	#define _LINUX_CRC_CCITT_H
1da177e4 LT	4
	5	#include <linux/types.h>
	6
	7	extern u16 const crc_ccitt_table[256];
0d85adb5	8	extern u16 const crc_ccitt_false_table[256];
1da177e4 LT	9
1da177e4 LT	10	extern u16 crc_ccitt(u16 crc, const u8 *buffer, size_t len);
0d85adb5	11	extern u16 crc_ccitt_false(u16 crc, const u8 *buffer, size_t len);
1da177e4 LT	12
	13	static inline u16 crc_ccitt_byte(u16 crc, const u8 c)
	14	{
	15	return (crc >> 8) ^ crc_ccitt_table[(crc ^ c) & 0xff];
	16	}
	17
0d85adb5 AM	18	static inline u16 crc_ccitt_false_byte(u16 crc, const u8 c)
	19	{
	20	return (crc << 8) ^ crc_ccitt_false_table[(crc >> 8) ^ c];
	21	}
	22
1da177e4	23	#endif /* _LINUX_CRC_CCITT_H */