u-boot/lib/crc8.c
Simon Glass c3a4d1c3ee common: Drop linux/crc8.h
We have an existing U-Boot header for the one function that this defines.
Use that instead of the linux/ one. Move over the nice comment.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:23:07 -05:00

37 lines
563 B
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2013 Google, Inc
*/
#ifdef USE_HOSTCC
#include <arpa/inet.h>
#else
#include <common.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;
}