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/*
* arbitrary precision integers
* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

/**
* @file
* arbitrary precision integers
* @author Michael Niedermayer <michaelni@gmx.at>
*/

#ifndef AVUTIL_INTEGER_H
#define AVUTIL_INTEGER_H

#include <stdint.h>
#include "common.h"

#define AV_INTEGER_SIZE 8

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

AVInteger av_add_i(AVInteger a, AVInteger b) av_const;
AVInteger av_sub_i(AVInteger a, AVInteger b) av_const;

/**
* Return the rounded-down value of the base 2 logarithm of the given
* AVInteger. This is simply the index of the most significant bit
* which is 1, or 0 if all bits are 0.
*/
int av_log2_i(AVInteger a) av_const;
AVInteger av_mul_i(AVInteger a, AVInteger b) av_const;

/**
* Return 0 if a==b, 1 if a>b and -1 if a<b.
*/
int av_cmp_i(AVInteger a, AVInteger b) av_const;

/**
* bitwise shift
* @param s the number of bits by which the value should be shifted right,
may be negative for shifting left
*/
AVInteger av_shr_i(AVInteger a, int s) av_const;

/**
* Return a % b.
* @param quot a/b will be stored here.
*/
AVInteger av_mod_i(AVInteger *quot, AVInteger a, AVInteger b);

/**
* Return a/b.
*/
AVInteger av_div_i(AVInteger a, AVInteger b) av_const;

/**
* Convert the given int64_t to an AVInteger.
*/
AVInteger av_int2i(int64_t a) av_const;

/**
* Convert the given AVInteger to an int64_t.
* If the AVInteger is too large to fit into an int64_t,
* then only the least significant 64 bits will be used.
*/
int64_t av_i2int(AVInteger a) av_const;

#endif /* AVUTIL_INTEGER_H */
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