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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 | 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 | }; |