mirror of
https://github.com/Telecominfraproject/OpenCellular.git
synced 2025-11-24 02:05:01 +00:00
0c3ba249ab
This reduces the number of exported header files to the minimum needed by
the existing userspace utilities and firmware implementations.
BUG=chromium:221544
BRANCH=none
TEST=manual, trybots
CQ-DEPEND=CL:47019,CL:47022,CL:47023
sudo FEATURES=test emerge vboot_reference
FEATURES=test emerge-$BOARD \
vboot_reference \
chromeos-cryptohome \
chromeos-installer \
chromeos-u-boot \
peach-u-boot \
depthcharge
Change-Id: I2946cc2dbaf5459a6c5eca92ca57d546498e6d85
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/47021
Reviewed-by: Randall Spangler <rspangler@chromium.org>
31 lines
678 B
C
31 lines
678 B
C
/* Copyright (c) 2013 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 "sysincludes.h"
|
|
|
|
#include "crc8.h"
|
|
|
|
/**
|
|
* Return CRC-8 of the data, using x^8 + x^2 + x + 1 polynomial. A table-based
|
|
* algorithm would be faster, but for only a few bytes it isn't worth the code
|
|
* size. */
|
|
uint8_t Crc8(const void *vptr, int len)
|
|
{
|
|
const uint8_t *data = vptr;
|
|
unsigned crc = 0;
|
|
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);
|
|
}
|