[people/ms/u-boot.git] / lib / crc8.c

/*
 * Copyright (c) 2013 Google, Inc
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include "linux/crc8.h"

#define POLY	(0x1070U << 3)

static unsigned char _crc8(unsigned short data)
{
	int i;

	for (i = 0; i < 8; i++) {
		if (data & 0x8000)
			data = data ^ POLY;
		data = data << 1;
	}

	return (unsigned char)(data >> 8);
}

unsigned int crc8(unsigned int crc, const unsigned char *vptr, int len)
{
	int i;

	for (i = 0; i < len; i++)
		crc = _crc8((crc ^ vptr[i]) << 8);

	return crc;
}
Commit	Line	Data
60d18d3f SG	1	/*
	2	* Copyright (c) 2013 Google, Inc
	3	*
	4	* SPDX-License-Identifier: GPL-2.0+
	5	*/
	6
	7	#include "linux/crc8.h"
	8
456ecd08 SR	9	#define POLY (0x1070U << 3)
	10
	11	static unsigned char _crc8(unsigned short data)
60d18d3f	12	{
456ecd08 SR	13	int i;
	14
	15	for (i = 0; i < 8; i++) {
	16	if (data & 0x8000)
	17	data = data ^ POLY;
	18	data = data << 1;
60d18d3f SG	19	}
60d18d3f SG	20
456ecd08 SR	21	return (unsigned char)(data >> 8);
	22	}
	23
	24	unsigned int crc8(unsigned int crc, const unsigned char *vptr, int len)
	25	{
	26	int i;
	27
	28	for (i = 0; i < len; i++)
	29	crc = _crc8((crc ^ vptr[i]) << 8);
	30
	31	return crc;
60d18d3f	32	}