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/**
* crc32 calculation routines.
*
* Copyright (c) 2005 by Andrew de Quincey <adq_dvb@lidskialf.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef _UCSI_CRC32_H
#define _UCSI_CRC32_H 1
#include <stdint.h>
#ifdef __cplusplus
extern "C"
{
#endif
#define CRC32_INIT (~0)
extern uint32_t crc32tbl[];
/**
* Calculate a CRC32 over a piece of data.
*
* @param crc Current CRC value (use CRC32_INIT for first call).
* @param buf Buffer to calculate over.
* @param len Number of bytes.
* @return Calculated CRC.
*/
static inline uint32_t crc32(uint32_t crc, uint8_t* buf, size_t len)
{
size_t i;
for (i=0; i< len; i++) {
crc = (crc << 8) ^ crc32tbl[((crc >> 24) ^ buf[i]) & 0xff];
}
return crc;
}
#ifdef __cplusplus
}
#endif
#endif
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