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