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gopher.c
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1 /*
2  * Gopher protocol
3  *
4  * Copyright (c) 2009 Toshimitsu Kimura
5  *
6  * based on libavformat/http.c, Copyright (c) 2000, 2001 Fabrice Bellard
7  *
8  * This file is part of FFmpeg.
9  *
10  * FFmpeg is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public
12  * License as published by the Free Software Foundation; either
13  * version 2.1 of the License, or (at your option) any later version.
14  *
15  * FFmpeg is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  * Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public
21  * License along with FFmpeg; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
25 #include "libavutil/avstring.h"
26 #include "avformat.h"
27 #include "internal.h"
28 #include "network.h"
29 #include "url.h"
30 
31 typedef struct GopherContext {
34 
35 static int gopher_write(URLContext *h, const uint8_t *buf, int size)
36 {
38  return ffurl_write(s->hd, buf, size);
39 }
40 
41 static int gopher_connect(URLContext *h, const char *path)
42 {
43  char buffer[1024];
44 
45  if (!*path) return AVERROR(EINVAL);
46  switch (*++path) {
47  case '5':
48  case '9':
49  path = strchr(path, '/');
50  if (!path) return AVERROR(EINVAL);
51  break;
52  default:
54  "Gopher protocol type '%c' not supported yet!\n",
55  *path);
56  return AVERROR(EINVAL);
57  }
58 
59  /* send gopher sector */
60  snprintf(buffer, sizeof(buffer), "%s\r\n", path);
61 
62  if (gopher_write(h, buffer, strlen(buffer)) < 0)
63  return AVERROR(EIO);
64 
65  return 0;
66 }
67 
69 {
71  if (s->hd) {
72  ffurl_close(s->hd);
73  s->hd = NULL;
74  }
75  return 0;
76 }
77 
78 static int gopher_open(URLContext *h, const char *uri, int flags)
79 {
81  char hostname[1024], auth[1024], path[1024], buf[1024];
82  int port, err;
83 
84  h->is_streamed = 1;
85 
86  /* needed in any case to build the host string */
87  av_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
88  path, sizeof(path), uri);
89 
90  if (port < 0)
91  port = 70;
92 
93  ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port, NULL);
94 
95  s->hd = NULL;
96  err = ffurl_open(&s->hd, buf, AVIO_FLAG_READ_WRITE,
98  if (err < 0)
99  goto fail;
100 
101  if ((err = gopher_connect(h, path)) < 0)
102  goto fail;
103  return 0;
104  fail:
105  gopher_close(h);
106  return err;
107 }
108 
109 static int gopher_read(URLContext *h, uint8_t *buf, int size)
110 {
111  GopherContext *s = h->priv_data;
112  int len = ffurl_read(s->hd, buf, size);
113  return len;
114 }
115 
116 
118  .name = "gopher",
119  .url_open = gopher_open,
120  .url_read = gopher_read,
121  .url_write = gopher_write,
122  .url_close = gopher_close,
123  .priv_data_size = sizeof(GopherContext),
125 };