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  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.  
  36. typedef struct AVInteger{
  37.     uint16_t v[AV_INTEGER_SIZE];
  38. } AVInteger;
  39.  
  40. AVInteger av_add_i(AVInteger a, AVInteger b) av_const;
  41. AVInteger av_sub_i(AVInteger a, AVInteger b) av_const;
  42.  
  43. /**
  44.  * Return 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.  */
  48. int av_log2_i(AVInteger a) av_const;
  49. AVInteger av_mul_i(AVInteger a, AVInteger b) av_const;
  50.  
  51. /**
  52.  * Return 0 if a==b, 1 if a>b and -1 if a<b.
  53.  */
  54. int 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.  */
  61. AVInteger av_shr_i(AVInteger a, int s) av_const;
  62.  
  63. /**
  64.  * Return a % b.
  65.  * @param quot a/b will be stored here.
  66.  */
  67. AVInteger av_mod_i(AVInteger *quot, AVInteger a, AVInteger b);
  68.  
  69. /**
  70.  * Return a/b.
  71.  */
  72. AVInteger av_div_i(AVInteger a, AVInteger b) av_const;
  73.  
  74. /**
  75.  * Convert the given int64_t to an AVInteger.
  76.  */
  77. AVInteger av_int2i(int64_t a) av_const;
  78.  
  79. /**
  80.  * Convert 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.  */
  84. int64_t av_i2int(AVInteger a) av_const;
  85.  
  86. #endif /* AVUTIL_INTEGER_H */
  87.