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libavutil/crc.h

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00001 /*
00002  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #ifndef AVUTIL_CRC_H
00022 #define AVUTIL_CRC_H
00023 
00024 #include <stdint.h>
00025 #include <stddef.h>
00026 #include "attributes.h"
00027 
00028 typedef uint32_t AVCRC;
00029 
00030 typedef enum {
00031     AV_CRC_8_ATM,
00032     AV_CRC_16_ANSI,
00033     AV_CRC_16_CCITT,
00034     AV_CRC_32_IEEE,
00035     AV_CRC_32_IEEE_LE,  /*< reversed bitorder version of AV_CRC_32_IEEE */
00036     AV_CRC_MAX,         /*< Not part of public API! Do not use outside libavutil. */
00037 }AVCRCId;
00038 
00039 int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size);
00040 const AVCRC *av_crc_get_table(AVCRCId crc_id);
00041 uint32_t av_crc(const AVCRC *ctx, uint32_t start_crc, const uint8_t *buffer, size_t length) av_pure;
00042 
00043 #endif /* AVUTIL_CRC_H */
00044 

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