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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;
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 };
static int gopher_open(URLContext *h, const char *uri, int flags)
Definition: gopher.c:78
void av_url_split(char *proto, int proto_size, char *authorization, int authorization_size, char *hostname, int hostname_size, int *port_ptr, char *path, int path_size, const char *url)
Split a URL string into components.
Definition: utils.c:4461
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options, const char *whitelist, const char *blacklist, URLContext *parent)
Create an URLContext for accessing to the resource indicated by url, and open it. ...
Definition: avio.c:309
#define URL_PROTOCOL_FLAG_NETWORK
Definition: url.h:34
URLContext * hd
Definition: gopher.c:32
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int ffurl_write(URLContext *h, const unsigned char *buf, int size)
Write size bytes from buf to the resource accessed by h.
Definition: avio.c:421
int is_streamed
true if streamed (no seek possible), default = false
Definition: url.h:45
AVIOInterruptCB interrupt_callback
Definition: url.h:47
static int gopher_read(URLContext *h, uint8_t *buf, int size)
Definition: gopher.c:109
uint8_t
static int flags
Definition: log.c:57
static int gopher_connect(URLContext *h, const char *path)
Definition: gopher.c:41
ptrdiff_t size
Definition: opengl_enc.c:101
#define av_log(a,...)
const char * protocol_whitelist
Definition: url.h:49
#define AVERROR(e)
Definition: error.h:43
#define fail()
Definition: checkasm.h:84
int ff_url_join(char *str, int size, const char *proto, const char *authorization, const char *hostname, int port, const char *fmt,...)
Definition: url.c:36
const char * protocol_blacklist
Definition: url.h:50
void * buf
Definition: avisynth_c.h:690
Definition: url.h:38
#define AVIO_FLAG_READ_WRITE
read-write pseudo flag
Definition: avio.h:608
static int gopher_close(URLContext *h)
Definition: gopher.c:68
void * priv_data
Definition: url.h:41
const URLProtocol ff_gopher_protocol
Definition: gopher.c:117
#define snprintf
Definition: snprintf.h:34
const char * name
Definition: url.h:54
int ffurl_close(URLContext *h)
Definition: avio.c:467
Main libavformat public API header.
int len
static int gopher_write(URLContext *h, const uint8_t *buf, int size)
Definition: gopher.c:35
unbuffered private I/O API
int ffurl_read(URLContext *h, unsigned char *buf, int size)
Read up to size bytes from the resource accessed by h, and store the read bytes in buf...
Definition: avio.c:407
GLuint buffer
Definition: opengl_enc.c:102