1/* 2 * arbitrary precision integers 3 * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file 24 * arbitrary precision integers 25 * @author Michael Niedermayer <michaelni@gmx.at> 26 */ 27 28#ifndef AVUTIL_INTEGER_H 29#define AVUTIL_INTEGER_H 30 31#include <stdint.h> 32#include "common.h" 33 34#define AV_INTEGER_SIZE 8 35 36typedef struct AVInteger{ 37 uint16_t v[AV_INTEGER_SIZE]; 38} AVInteger; 39 40AVInteger av_add_i(AVInteger a, AVInteger b) av_const; 41AVInteger av_sub_i(AVInteger a, AVInteger b) av_const; 42 43/** 44 * Returns the rounded-down value of the base 2 logarithm of the given 45 * AVInteger. This is simply the index of the most significant bit 46 * which is 1, or 0 if all bits are 0. 47 */ 48int av_log2_i(AVInteger a) av_const; 49AVInteger av_mul_i(AVInteger a, AVInteger b) av_const; 50 51/** 52 * Returns 0 if a==b, 1 if a>b and -1 if a<b. 53 */ 54int av_cmp_i(AVInteger a, AVInteger b) av_const; 55 56/** 57 * bitwise shift 58 * @param s the number of bits by which the value should be shifted right, 59 may be negative for shifting left 60 */ 61AVInteger av_shr_i(AVInteger a, int s) av_const; 62 63/** 64 * Returns a % b. 65 * @param quot a/b will be stored here. 66 */ 67AVInteger av_mod_i(AVInteger *quot, AVInteger a, AVInteger b); 68 69/** 70 * Returns a/b. 71 */ 72AVInteger av_div_i(AVInteger a, AVInteger b) av_const; 73 74/** 75 * Converts the given int64_t to an AVInteger. 76 */ 77AVInteger av_int2i(int64_t a) av_const; 78 79/** 80 * Converts the given AVInteger to an int64_t. 81 * If the AVInteger is too large to fit into an int64_t, 82 * then only the least significant 64 bits will be used. 83 */ 84int64_t av_i2int(AVInteger a) av_const; 85 86#endif /* AVUTIL_INTEGER_H */ 87