summaryrefslogtreecommitdiff
path: root/libavutil/integer.h
blob: 2a6f8b0279d9a80b889a2af35c035d2f5fce180a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
/*
 * 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 integer.h
 * arbitrary precision integers
 * @author Michael Niedermayer <michaelni@gmx.at>
 */

#ifndef INTEGER_H
#define INTEGER_H

#include <stdint.h>

#define AV_INTEGER_SIZE 8

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

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

/**
 * returns the rounded down value of the logarithm of base 2 of the given AVInteger.
 * this is simply the index of the most significant bit which is 1. Or 0 of all bits are 0
 */
int av_log2_i(AVInteger a);
AVInteger av_mul_i(AVInteger a, AVInteger b);

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

/**
 * 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);

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

/**
 * returns a/b.
 */
AVInteger av_div_i(AVInteger a, AVInteger b);

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

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

#endif // INTEGER_H