1 /*
2 * WebP parser
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 /**
22 * @file
23 * WebP parser
24 */
25
28
30
36
38 const uint8_t **poutbuf, int *poutbuf_size,
39 const uint8_t *buf, int buf_size)
40 {
45
47 *poutbuf_size = 0;
48
49 restart:
50 if (
ctx->pc.frame_start_found <= 8) {
51 for (;
i < buf_size;
i++) {
53 if (
ctx->pc.frame_start_found == 0) {
56 if (
ctx->fsize > 15 &&
ctx->fsize <= UINT32_MAX - 10) {
57 ctx->pc.frame_start_found = 1;
59 }
60 }
61 }
else if (
ctx->pc.frame_start_found == 8) {
63 ctx->pc.frame_start_found = 0;
64 continue;
65 }
66 ctx->pc.frame_start_found++;
67 ctx->remaining_size =
ctx->fsize +
i - 15;
68 if (
ctx->pc.index +
i > 15) {
71 break;
72 } else {
74 goto restart;
75 }
76 }
else if (
ctx->pc.frame_start_found)
77 ctx->pc.frame_start_found++;
78 }
80 } else {
81 if (
ctx->remaining_size) {
83 ctx->remaining_size -=
i;
84 if (
ctx->remaining_size)
86
87 ctx->pc.frame_start_found = 0;
88 goto restart;
89 }
90 }
91
94 return buf_size;
95
97 ctx->pc.frame_start_found =
FFMAX(
ctx->pc.frame_start_found -
i - 1, 0);
98 else
99 ctx->pc.frame_start_found = 0;
100
101 *poutbuf = buf;
102 *poutbuf_size = buf_size;
103
104 return next;
105 }
106
112 };