1 /*

     2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>

     3  *

     4  * This file is part of Libav.

     5  *

     6  * Libav is free software; you can redistribute it and/or

     7  * modify it under the terms of the GNU Lesser General Public

     8  * License as published by the Free Software Foundation; either

     9  * version 2.1 of the License, or (at your option) any later version.

    10  *

    11  * Libav is distributed in the hope that it will be useful,

    12  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    14  * Lesser General Public License for more details.

    15  *

    16  * You should have received a copy of the GNU Lesser General Public

    17  * License along with Libav; if not, write to the Free Software

    18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

    19  */

    20 

    21 #ifndef AVUTIL_CRC_H

    22 #define AVUTIL_CRC_H

    23 

    24 #include <stdint.h>

    25 #include <stddef.h>

    26 #include "attributes.h"

    27 

    28 typedef uint32_t AVCRC;

    29 

    30 typedef enum {

    31     AV_CRC_8_ATM,

    32     AV_CRC_16_ANSI,

    33     AV_CRC_16_CCITT,

    34     AV_CRC_32_IEEE,

    35     AV_CRC_32_IEEE_LE,  /*< reversed bitorder version of AV_CRC_32_IEEE */

    36     AV_CRC_MAX,         /*< Not part of public API! Do not use outside libavutil. */

    37 }AVCRCId;

    38 

    39 int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size);

    40 const AVCRC *av_crc_get_table(AVCRCId crc_id);

    41 uint32_t av_crc(const AVCRC *ctx, uint32_t start_crc, const uint8_t *buffer, size_t length) av_pure;

    42 

    43 #endif /* AVUTIL_CRC_H */