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1 | /* |
2 | * Copyright (C) 2007 The FFmpeg Project | |
3 | * | |
4 | * This file is part of FFmpeg. | |
5 | * | |
6 | * FFmpeg is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * FFmpeg is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with FFmpeg; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include "libavutil/intreadwrite.h" | |
22 | #include "xiph.h" | |
23 | ||
f6fa7814 | 24 | int avpriv_split_xiph_headers(const uint8_t *extradata, int extradata_size, |
2ba45a60 DM |
25 | int first_header_size, uint8_t *header_start[3], |
26 | int header_len[3]) | |
27 | { | |
28 | int i; | |
29 | ||
30 | if (extradata_size >= 6 && AV_RB16(extradata) == first_header_size) { | |
31 | int overall_len = 6; | |
32 | for (i=0; i<3; i++) { | |
33 | header_len[i] = AV_RB16(extradata); | |
34 | extradata += 2; | |
35 | header_start[i] = extradata; | |
36 | extradata += header_len[i]; | |
37 | if (overall_len > extradata_size - header_len[i]) | |
38 | return -1; | |
39 | overall_len += header_len[i]; | |
40 | } | |
41 | } else if (extradata_size >= 3 && extradata_size < INT_MAX - 0x1ff && extradata[0] == 2) { | |
42 | int overall_len = 3; | |
43 | extradata++; | |
44 | for (i=0; i<2; i++, extradata++) { | |
45 | header_len[i] = 0; | |
46 | for (; overall_len < extradata_size && *extradata==0xff; extradata++) { | |
47 | header_len[i] += 0xff; | |
48 | overall_len += 0xff + 1; | |
49 | } | |
50 | header_len[i] += *extradata; | |
51 | overall_len += *extradata; | |
52 | if (overall_len > extradata_size) | |
53 | return -1; | |
54 | } | |
55 | header_len[2] = extradata_size - overall_len; | |
56 | header_start[0] = extradata; | |
57 | header_start[1] = header_start[0] + header_len[0]; | |
58 | header_start[2] = header_start[1] + header_len[1]; | |
59 | } else { | |
60 | return -1; | |
61 | } | |
62 | return 0; | |
63 | } |