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
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 */
37 unsigned leb = 0;
38
39 do {
41 unsigned bits =
byte & 0x7f;
42 more = byte & 0x80;
44 leb |=
bits << (
i * 7);
46 break;
47 } while (more);
48
49 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 */
59
60 for (
int i = 0;
i < 8;
i++) {
63 if (!(byte & 0x80))
64 break;
65 }
66
68 }
69
70 #endif /* AVCODEC_LEB_H */