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/avutil.h"
24 #include "libavutil/base64.h"
25 #include "url.h"
26
27 typedef struct {
28 const uint8_t *data;
29 void *tofree;
30 size_t size;
31 size_t pos;
32 } DataContext;
33
data_open(URLContext *h, const char *uri, int flags)34 static av_cold int data_open(URLContext *h, const char *uri, int flags)
35 {
36 DataContext *dc = h->priv_data;
37 const char *data, *opt, *next;
38 char *ddata;
39 int ret, base64 = 0;
40 size_t in_size;
41
42 /* data:content/type[;base64],payload */
43
44 av_strstart(uri, "data:", &uri);
45 data = strchr(uri, ',');
46 if (!data) {
47 av_log(h, AV_LOG_ERROR, "No ',' delimiter in URI\n");
48 return AVERROR(EINVAL);
49 }
50 opt = uri;
51 while (opt < data) {
52 next = av_x_if_null(memchr(opt, ';', data - opt), data);
53 if (opt == uri) {
54 if (!memchr(opt, '/', next - opt)) { /* basic validity check */
55 av_log(h, AV_LOG_ERROR, "Invalid content-type '%.*s'\n",
56 (int)(next - opt), opt);
57 return AVERROR(EINVAL);
58 }
59 av_log(h, AV_LOG_VERBOSE, "Content-type: %.*s\n",
60 (int)(next - opt), opt);
61 } else {
62 if (!av_strncasecmp(opt, "base64", next - opt)) {
63 base64 = 1;
64 } else {
65 av_log(h, AV_LOG_VERBOSE, "Ignoring option '%.*s'\n",
66 (int)(next - opt), opt);
67 }
68 }
69 opt = next + 1;
70 }
71
72 data++;
73 in_size = strlen(data);
74 if (base64) {
75 size_t out_size = 3 * (in_size / 4) + 1;
76
77 if (out_size > INT_MAX || !(ddata = av_malloc(out_size)))
78 return AVERROR(ENOMEM);
79 if ((ret = av_base64_decode(ddata, data, out_size)) < 0) {
80 av_free(ddata);
81 av_log(h, AV_LOG_ERROR, "Invalid base64 in URI\n");
82 return ret;
83 }
84 dc->data = dc->tofree = ddata;
85 dc->size = ret;
86 } else {
87 dc->data = data;
88 dc->size = in_size;
89 }
90 return 0;
91 }
92
data_close(URLContext *h)93 static av_cold int data_close(URLContext *h)
94 {
95 DataContext *dc = h->priv_data;
96
97 av_freep(&dc->tofree);
98 return 0;
99 }
100
data_read(URLContext *h, unsigned char *buf, int size)101 static int data_read(URLContext *h, unsigned char *buf, int size)
102 {
103 DataContext *dc = h->priv_data;
104
105 if (dc->pos >= dc->size)
106 return AVERROR_EOF;
107 size = FFMIN(size, dc->size - dc->pos);
108 memcpy(buf, dc->data + dc->pos, size);
109 dc->pos += size;
110 return size;
111 }
112
113 const URLProtocol ff_data_protocol = {
114 .name = "data",
115 .url_open = data_open,
116 .url_close = data_close,
117 .url_read = data_read,
118 .priv_data_size = sizeof(DataContext),
119 };
120