[J-u-boot.git] / lib / crc8.c

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

#ifdef USE_HOSTCC
#include <arpa/inet.h>
#endif
#include <u-boot/crc.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;
}

void crc8_wd_buf(const unsigned char *input, unsigned int len,
		 unsigned char output[1], unsigned int chunk_sz)
{
	*output = crc8(0, input, len);
}
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
60d18d3f SG	2	/*
60d18d3f SG	3	* Copyright (c) 2013 Google, Inc
60d18d3f SG	4	*/
60d18d3f SG	5
c3a4d1c3 SG	6	#ifdef USE_HOSTCC
c3a4d1c3 SG	7	#include <arpa/inet.h>
c3a4d1c3 SG	8	#endif
c3a4d1c3 SG	9	#include <u-boot/crc.h>
60d18d3f	10
456ecd08 SR	11	#define POLY (0x1070U << 3)
	12
	13	static unsigned char _crc8(unsigned short data)
60d18d3f	14	{
456ecd08 SR	15	int i;
	16
	17	for (i = 0; i < 8; i++) {
	18	if (data & 0x8000)
	19	data = data ^ POLY;
	20	data = data << 1;
60d18d3f SG	21	}
60d18d3f SG	22
456ecd08 SR	23	return (unsigned char)(data >> 8);
	24	}
	25
	26	unsigned int crc8(unsigned int crc, const unsigned char *vptr, int len)
	27	{
	28	int i;
	29
	30	for (i = 0; i < len; i++)
	31	crc = _crc8((crc ^ vptr[i]) << 8);
	32
	33	return crc;
60d18d3f	34	}
6f1b27a7 SG	35
	36	void crc8_wd_buf(const unsigned char *input, unsigned int len,
	37	unsigned char output[1], unsigned int chunk_sz)
	38	{
	39	*output = crc8(0, input, len);
	40	}