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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 "attributes.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 */