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