integer.h 1.73 KB
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/*
 * arbitrary precision integers
 * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
 *
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 * This file is part of FFmpeg.
 *
 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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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 *
 */
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/**
 * @file integer.h
 * arbitrary precision integers
 * @author Michael Niedermayer <michaelni@gmx.at>
 */
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#ifndef INTEGER_H
#define INTEGER_H

#define AV_INTEGER_SIZE 8

typedef struct AVInteger{
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    uint16_t v[AV_INTEGER_SIZE];
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} AVInteger;

AVInteger av_add_i(AVInteger a, AVInteger b);
AVInteger av_sub_i(AVInteger a, AVInteger b);
int av_log2_i(AVInteger a);
AVInteger av_mul_i(AVInteger a, AVInteger b);
int av_cmp_i(AVInteger a, AVInteger b);
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/**
 * bitwise shift.
 * @param s the number of bits by which the value should be shifted right, may be negative for shifting left
 */
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AVInteger av_shr_i(AVInteger a, int s);
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/**
 * returns a % b.
 * @param quot a/b will be stored here
 */
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AVInteger av_mod_i(AVInteger *quot, AVInteger a, AVInteger b);
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/**
 * returns a/b.
 */
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AVInteger av_div_i(AVInteger a, AVInteger b);
AVInteger av_int2i(int64_t a);
int64_t av_i2int(AVInteger a);

#endif // INTEGER_H