crc.h

См. документацию.

/*
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
 
#ifndef AVUTIL_CRC_H
#define AVUTIL_CRC_H
 
#include <stdint.h>
#include <stddef.h>
#include "attributes.h"
#include "version.h"
 
typedef uint32_t AVCRC;
 
typedef enum {
    AV_CRC_8_ATM,
    AV_CRC_16_ANSI,
    AV_CRC_16_CCITT,
    AV_CRC_32_IEEE,
    AV_CRC_32_IEEE_LE,  /*< reversed bitorder version of AV_CRC_32_IEEE */
    AV_CRC_16_ANSI_LE,  /*< reversed bitorder version of AV_CRC_16_ANSI */
    AV_CRC_24_IEEE,
    AV_CRC_8_EBU,
    AV_CRC_MAX,         /*< Not part of public API! Do not use outside libavutil. */
}AVCRCId;
 
int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size);
 
const AVCRC *av_crc_get_table(AVCRCId crc_id);
 
uint32_t av_crc(const AVCRC *ctx, uint32_t crc,
                const uint8_t *buffer, size_t length) av_pure;
 
#endif /* AVUTIL_CRC_H */