blob: 45f733c04c2b7400b83c535de4f17c32e8425cf8
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 |