adler32.h 1.4 KB
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/*
 * copyright (c) 2006 Mans Rullgard
 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * 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
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

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#ifndef AVUTIL_ADLER32_H
#define AVUTIL_ADLER32_H
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#include <stdint.h>
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#include "attributes.h"
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/**
 * 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
 */
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unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf,
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                                unsigned int len) av_pure;
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#endif /* AVUTIL_ADLER32_H */