blob: 1863830abe1bd48100984db1469d8e92f0eb5225
1 | /* |
2 | * Copyright (c) 2012 Nicolas George |
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 License |
8 | * 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 |
14 | * GNU Lesser General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU Lesser General Public License |
17 | * along with FFmpeg; if not, write to the Free Software Foundation, Inc., |
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
19 | */ |
20 | |
21 | #include <string.h> |
22 | #include "libavutil/avstring.h" |
23 | #include "libavutil/base64.h" |
24 | #include "url.h" |
25 | |
26 | typedef struct { |
27 | const uint8_t *data; |
28 | void *tofree; |
29 | size_t size; |
30 | size_t pos; |
31 | } DataContext; |
32 | |
33 | static av_cold int data_open(URLContext *h, const char *uri, int flags) |
34 | { |
35 | DataContext *dc = h->priv_data; |
36 | const char *data, *opt, *next; |
37 | char *ddata; |
38 | int ret, base64 = 0; |
39 | size_t in_size; |
40 | |
41 | /* data:content/type[;base64],payload */ |
42 | |
43 | av_strstart(uri, "data:", &uri); |
44 | data = strchr(uri, ','); |
45 | if (!data) { |
46 | av_log(h, AV_LOG_ERROR, "No ',' delimiter in URI\n"); |
47 | return AVERROR(EINVAL); |
48 | } |
49 | opt = uri; |
50 | while (opt < data) { |
51 | next = av_x_if_null(memchr(opt, ';', data - opt), data); |
52 | if (opt == uri) { |
53 | if (!memchr(opt, '/', next - opt)) { /* basic validity check */ |
54 | av_log(h, AV_LOG_ERROR, "Invalid content-type '%.*s'\n", |
55 | (int)(next - opt), opt); |
56 | return AVERROR(EINVAL); |
57 | } |
58 | av_log(h, AV_LOG_VERBOSE, "Content-type: %.*s\n", |
59 | (int)(next - opt), opt); |
60 | } else { |
61 | if (!av_strncasecmp(opt, "base64", next - opt)) { |
62 | base64 = 1; |
63 | } else { |
64 | av_log(h, AV_LOG_VERBOSE, "Ignoring option '%.*s'\n", |
65 | (int)(next - opt), opt); |
66 | } |
67 | } |
68 | opt = next + 1; |
69 | } |
70 | |
71 | data++; |
72 | in_size = strlen(data); |
73 | if (base64) { |
74 | size_t out_size = 3 * (in_size / 4) + 1; |
75 | |
76 | if (out_size > INT_MAX || !(ddata = av_malloc(out_size))) |
77 | return AVERROR(ENOMEM); |
78 | if ((ret = av_base64_decode(ddata, data, out_size)) < 0) { |
79 | av_free(ddata); |
80 | av_log(h, AV_LOG_ERROR, "Invalid base64 in URI\n"); |
81 | return ret; |
82 | } |
83 | dc->data = dc->tofree = ddata; |
84 | dc->size = ret; |
85 | } else { |
86 | dc->data = data; |
87 | dc->size = in_size; |
88 | } |
89 | return 0; |
90 | } |
91 | |
92 | static av_cold int data_close(URLContext *h) |
93 | { |
94 | DataContext *dc = h->priv_data; |
95 | |
96 | av_freep(&dc->tofree); |
97 | return 0; |
98 | } |
99 | |
100 | static int data_read(URLContext *h, unsigned char *buf, int size) |
101 | { |
102 | DataContext *dc = h->priv_data; |
103 | |
104 | if (dc->pos >= dc->size) |
105 | return AVERROR_EOF; |
106 | size = FFMIN(size, dc->size - dc->pos); |
107 | memcpy(buf, dc->data + dc->pos, size); |
108 | dc->pos += size; |
109 | return size; |
110 | } |
111 | |
112 | const URLProtocol ff_data_protocol = { |
113 | .name = "data", |
114 | .url_open = data_open, |
115 | .url_close = data_close, |
116 | .url_read = data_read, |
117 | .priv_data_size = sizeof(DataContext), |
118 | }; |
119 |