[linux-block.git] / include / linux / crc-itu-t.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *	crc-itu-t.h - CRC ITU-T V.41 routine
 *
 * Implements the standard CRC ITU-T V.41:
 *   Width 16
 *   Poly  0x1021 (x^16 + x^12 + x^5 + 1)
 *   Init  0
 */

#ifndef CRC_ITU_T_H
#define CRC_ITU_T_H

#include <linux/types.h>

extern u16 const crc_itu_t_table[256];

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

static inline u16 crc_itu_t_byte(u16 crc, const u8 data)
{
	return (crc << 8) ^ crc_itu_t_table[((crc >> 8) ^ data) & 0xff];
}

#endif /* CRC_ITU_T_H */
Commit	Line	Data
40b0b3f8	1	/* SPDX-License-Identifier: GPL-2.0-only */
3e7cbae7 ID	2	/*
	3	* crc-itu-t.h - CRC ITU-T V.41 routine
	4	*
	5	* Implements the standard CRC ITU-T V.41:
	6	* Width 16
77991645	7	* Poly 0x1021 (x^16 + x^12 + x^5 + 1)
3e7cbae7	8	* Init 0
3e7cbae7 ID	9	*/
	10
	11	#ifndef CRC_ITU_T_H
	12	#define CRC_ITU_T_H
	13
	14	#include <linux/types.h>
	15
	16	extern u16 const crc_itu_t_table[256];
	17
	18	extern u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len);
	19
	20	static inline u16 crc_itu_t_byte(u16 crc, const u8 data)
	21	{
	22	return (crc << 8) ^ crc_itu_t_table[((crc >> 8) ^ data) & 0xff];
	23	}
	24
	25	#endif /* CRC_ITU_T_H */
	26