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2134
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1 /*
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2 * copyright (c) 2006 Mans Rullgard
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3 *
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4 * This file is part of FFmpeg.
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5 *
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6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
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8 * License as published by the Free Software Foundation; either
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9 * version 2.1 of the License, or (at your option) any later version.
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10 *
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11 * FFmpeg is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * Lesser General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU Lesser General Public
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17 * License along with FFmpeg; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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19 */
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20
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21 #ifndef AVUTIL_ADLER32_H
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22 #define AVUTIL_ADLER32_H
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23
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24 #include <stdint.h>
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25 #include "attributes.h"
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26
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27 /**
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28 * @ingroup lavu_crypto
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29 * Calculate the Adler32 checksum of a buffer.
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30 *
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31 * Passing the return value to a subsequent av_adler32_update() call
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32 * allows the checksum of multiple buffers to be calculated as though
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33 * they were concatenated.
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34 *
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35 * @param adler initial checksum value
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36 * @param buf pointer to input buffer
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37 * @param len size of input buffer
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38 * @return updated checksum
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39 */
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40 unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf,
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41 unsigned int len) av_pure;
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42
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43 #endif /* AVUTIL_ADLER32_H */
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