1 /*

     2  * copyright (c) 2006 Mans Rullgard

     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_ADLER32_H

    22 #define AVUTIL_ADLER32_H

    23 

    24 #include <stdint.h>

    25 #include "attributes.h"

    26 

    27 /**

    28  * @ingroup lavu_crypto

    29  * Calculate the Adler32 checksum of a buffer.

    30  *

    31  * Passing the return value to a subsequent av_adler32_update() call

    32  * allows the checksum of multiple buffers to be calculated as though

    33  * they were concatenated.

    34  *

    35  * @param adler initial checksum value

    36  * @param buf   pointer to input buffer

    37  * @param len   size of input buffer

    38  * @return      updated checksum

    39  */

    40 unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf,

    41                                 unsigned int len) av_pure;

    42 

    43 #endif /* AVUTIL_ADLER32_H */