58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
/****************************************************************************
|
|
* libs/libc/misc/lib_crc8table.c
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <sys/types.h>
|
|
#include <stdint.h>
|
|
|
|
#include <nuttx/crc8.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: crc8table
|
|
*
|
|
* Description:
|
|
* Return a 8-bit CRC of the contents of the 'src' buffer, length 'len'
|
|
* using a CRC with crc table used for calculation.
|
|
*
|
|
****************************************************************************/
|
|
|
|
uint8_t crc8table(const uint8_t table[256], const uint8_t *src,
|
|
size_t len, uint8_t crc8val)
|
|
{
|
|
size_t i;
|
|
|
|
crc8val ^= 0xff;
|
|
for (i = 0; i < len; i++)
|
|
{
|
|
crc8val = table[crc8val ^ src[i]];
|
|
}
|
|
|
|
return crc8val ^ 0xff;
|
|
}
|