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/* Copyright 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "common.h"
#include "crc8.h"
inline uint8_t crc8(const uint8_t *data, int len)
{
return crc8_arg(data, len, 0);
}
uint8_t crc8_arg(const uint8_t *data, int len, uint8_t previous_crc)
{
unsigned crc = previous_crc << 8;
int i, j;
for (j = len; j; j--, data++) {
crc ^= (*data << 8);
for (i = 8; i; i--) {
if (crc & 0x8000)
crc ^= (0x1070 << 3);
crc <<= 1;
}
}
return (uint8_t)(crc >> 8);
}
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