/*

 * copyright (c) 2006 Mans Rullgard

 *

 * This file is part of Libav.

 *

 * Libav 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.

 *

 * Libav 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 Libav; if not, write to the Free Software

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

 */

#ifndef AVUTIL_ADLER32_H

#define AVUTIL_ADLER32_H

#include <stdint.h>

#include "attributes.h"

/**

 * @ingroup lavu_crypto

 * Calculate the Adler32 checksum of a buffer.

 *

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

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

 * they were concatenated.

 *

 * @param adler initial checksum value

 * @param buf   pointer to input buffer

 * @param len   size of input buffer

 * @return      updated checksum

 */

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

                                unsigned int len) av_pure;

#endif /* AVUTIL_ADLER32_H */