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87d84e437a
Add crc32_ieee() and crc32_ieeepart() that produce CRC32 values
compatible with Linux/zlib. The difference from the existing crc32():
crc32(): init=0, no final XOR (NuttX native)
crc32_ieee(): init=0xFFFFFFFF, final XOR 0xFFFFFFFF (Linux/zlib)
The existing crc32() and crc32part() are unchanged to avoid breaking
existing callers (bbsram, sbram, etc.).
New functions:
crc32_ieee(src, len) - full CRC, Linux-compatible
crc32_ieeepart(src, len, crcval) - incremental CRC, Linux-compatible
Verified on sim:nsh against known Linux zlib test vectors:
crc32_ieee("hello") = 0x3610a686 (Linux: 0x3610a686) PASS
crc32_ieee("123456789") = 0xcbf43926 (Linux: 0xcbf43926) PASS
crc32_ieee("") = 0x00000000 (Linux: 0x00000000) PASS
crc32_ieeepart incremental = 0xcbf43926 PASS
crc32("hello") = 0xf032519b (unchanged) PASS
Signed-off-by: hanzhijian <hanzhijian@zepp.com>
148 lines
5 KiB
C
148 lines
5 KiB
C
/****************************************************************************
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* include/nuttx/crc32.h
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_CRC32_H
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#define __INCLUDE_NUTTX_CRC32_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/types.h>
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#include <stdint.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Append full suffix to avoid the penitential symbol collision */
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#define crc32 crc32full
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Name: crc32part
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*
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* Description:
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* Continue CRC calculation on a part of the buffer.
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*
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****************************************************************************/
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uint32_t crc32part(FAR const uint8_t *src, size_t len, uint32_t crc32val);
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/****************************************************************************
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* Name: crc32
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*
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* Description:
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* Return a 32-bit CRC of the contents of the 'src' buffer, length 'len'
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*
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****************************************************************************/
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uint32_t crc32(FAR const uint8_t *src, size_t len);
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/****************************************************************************
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* Name: crc32h04c11db7_part
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*
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* Description:
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* Continue CRC calculation on a part of the buffer
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* using the 0x04c11db7 polynomial.
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*
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****************************************************************************/
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uint32_t crc32h04c11db7_part(FAR const uint8_t *src,
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size_t len, uint32_t crc32val);
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/****************************************************************************
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* Name: crc32h04c11db7
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*
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* Description:
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* Return a 32-bit CRC of the contents of the 'src' buffer, length 'len'
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* using the 0x04c11db7 polynomial.
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*
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****************************************************************************/
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uint32_t crc32h04c11db7(FAR const uint8_t *src, size_t len);
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/****************************************************************************
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* Name: crc32hf4acfb13_part
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*
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* Description:
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* Continue CRC calculation on a part of the buffer
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* using the 0xF4ACFB13 polynomial.
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*
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****************************************************************************/
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uint32_t crc32hf4acfb13_part(FAR const uint8_t *src,
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size_t len, uint32_t crc32val);
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/****************************************************************************
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* Name: crc32hf4acfb13
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*
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* Description:
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* Return a 32-bit CRC of the contents of the 'src' buffer, length 'len'
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* using the 0xF4ACFB13 polynomial.
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*
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****************************************************************************/
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uint32_t crc32hf4acfb13(FAR const uint8_t *src, size_t len);
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/****************************************************************************
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* Name: crc32_ieeepart
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*
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* Description:
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* Continue IEEE CRC32 calculation on a part of the buffer.
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* Compatible with Linux/zlib crc32(). Uses init value 0xFFFFFFFF and
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* final XOR with 0xFFFFFFFF.
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*
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****************************************************************************/
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uint32_t crc32_ieeepart(FAR const uint8_t *src,
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size_t len, uint32_t crc32val);
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/****************************************************************************
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* Name: crc32_ieee
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*
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* Description:
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* Return an IEEE-standard 32-bit CRC compatible with Linux/zlib crc32().
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* Uses init value 0xFFFFFFFF and final XOR with 0xFFFFFFFF.
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*
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****************************************************************************/
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uint32_t crc32_ieee(FAR const uint8_t *src, size_t len);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_NUTTX_CRC32_H */
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