crc32.h

См. документацию.

/*
 *  CMSIS2000
 *  CMSIS-like sources for LPC2xxx series MCUs
 *
 *  (C) Copyright 2011-2012, Dmitriy Cherepanov, All Rights Reserved
 *
 *  Version: 0.0.7
 *  Date of the Last Update:  2013-03-04
 *  
 *  Permission is hereby granted, free of charge, to any person obtaining a copy
 *  of this software and associated documentation files (the "Software"), to
 *  deal in the Software without restriction, including without limitation the
 *  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 *  sell copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in
 *  all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 *  IN THE SOFTWARE.
 *
 *  Do not be lasy! For the latest version see http://irtos.sourceforge.net .
 *
 *  
#*/
/*----------------------------------------------------------------------------*/
/** Begin CRC calculation.
 * \return CRC calc start value
*/

#define crc32_init()    ((uint32_t)0xffffffff)
/*----------------------------------------------------------------------------*/
/** Finish CRC calculation
 * \par crc current CRC value
 * \return end CRC value
 */
#define crc32_end(crc)  (((uint32_t)(crc)) ^ ((uint32_t)0xffffffff))
/*----------------------------------------------------------------------------*/
/***\brief crc32_update
        Calculate CRC value one at a time
        the CRC area, and passing value to get the CRC
        \par crc previous CRC
        \par val8 curr data
        \return new CRC
*/
uint32_t crc32_update(uint32_t crc_in, uint8_t val8);
/*----------------------------------------------------------------------------*/
/***\brief crc32_no_comp
        Calculate CRC for array of bytes without complement to ones.

        \par crc previous CRC (if no previous set is to 0!)
        \par data curr data ptr
        \par len curr data length

        \return returned value          calculated  CRC
*/
uint32_t crc32_no_comp (uint32_t curr_crc, const uint8_t *data8, size_t len);

/*----------------------------------------------------------------------------*/
/***\brief crc32
        Calculate CRC for array of bytes

        \par crc previous CRC (if no previous set is to 0!)
        \par data curr data ptr
        \par len curr data length

        \return returned value          calculated  CRC
*/
static inline uint32_t crc32 (uint32_t curr_crc, const uint8_t *data, size_t len)
{
return (crc32_end(
                crc32_no_comp( curr_crc ^ crc32_init(),
                                data,len)
                )
        );
}