FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/leb.h
Date: 2024-07-17 14:05:47
Exec Total Coverage
Lines: 20 20 100.0%
Functions: 2 2 100.0%
Branches: 10 10 100.0%

Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /**
20 * @file
21 * leb128 handling implementations
22 */
23
24 #ifndef AVCODEC_LEB_H
25 #define AVCODEC_LEB_H
26
27 #include "get_bits.h"
28
29 /**
30 * Read a unsigned integer coded as a variable number of up to eight
31 * little-endian bytes, where the MSB in a byte signals another byte
32 * must be read.
33 * All coded bits are read, but values > UINT_MAX are truncated.
34 */
35 13215 static inline unsigned get_leb(GetBitContext *s) {
36 13215 int more, i = 0;
37 13215 unsigned leb = 0;
38
39 do {
40 15688 int byte = get_bits(s, 8);
41 15688 unsigned bits = byte & 0x7f;
42 15688 more = byte & 0x80;
43
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15688 if (i <= 4)
44 15624 leb |= bits << (i * 7);
45
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15688 if (++i == 8)
46 21 break;
47
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15667 } while (more);
48
49 13215 return leb;
50 }
51
52 /**
53 * Read a unsigned integer coded as a variable number of up to eight
54 * little-endian bytes, where the MSB in a byte signals another byte
55 * must be read.
56 */
57 3478 static inline int64_t get_leb128(GetBitContext *gb) {
58 3478 int64_t ret = 0;
59
60
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4183 for (int i = 0; i < 8; i++) {
61 4177 int byte = get_bits(gb, 8);
62 4177 ret |= (int64_t)(byte & 0x7f) << (i * 7);
63
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4177 if (!(byte & 0x80))
64 3472 break;
65 }
66
67 3478 return ret;
68 }
69
70 #endif /* AVCODEC_LEB_H */
71