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83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/*
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* arbitrary precision integers
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* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* 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
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* 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
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* 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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*/
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/**
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* @file integer.h
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* arbitrary precision integers
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* @author Michael Niedermayer <michaelni@gmx.at>
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*/
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#ifndef INTEGER_H
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#define INTEGER_H
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#define AV_INTEGER_SIZE 8
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typedef struct AVInteger{
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uint16_t v[AV_INTEGER_SIZE];
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} AVInteger;
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AVInteger av_add_i(AVInteger a, AVInteger b);
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AVInteger av_sub_i(AVInteger a, AVInteger b);
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/**
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* returns the rounded down value of the logarithm of base 2 of the given AVInteger.
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* this is simply the index of the most significant bit which is 1. Or 0 of all bits are 0
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*/
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int av_log2_i(AVInteger a);
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AVInteger av_mul_i(AVInteger a, AVInteger b);
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/**
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* returns 0 if a==b, 1 if a>b and -1 if a<b.
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*/
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int av_cmp_i(AVInteger a, AVInteger b);
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/**
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* bitwise shift.
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* @param s the number of bits by which the value should be shifted right, may be negative for shifting left
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*/
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AVInteger av_shr_i(AVInteger a, int s);
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/**
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* returns a % b.
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* @param quot a/b will be stored here
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*/
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AVInteger av_mod_i(AVInteger *quot, AVInteger a, AVInteger b);
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/**
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* returns a/b.
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*/
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AVInteger av_div_i(AVInteger a, AVInteger b);
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/**
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* converts the given int64_t to an AVInteger.
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*/
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AVInteger av_int2i(int64_t a);
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/**
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* converts the given AVInteger to an int64_t.
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* if the AVInteger is too large to fit into an int64_t,
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* then only the least significant 64bit will be used
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*/
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int64_t av_i2int(AVInteger a);
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#endif // INTEGER_H
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