crc8.c
492 Bytes
/*
* 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;
}