libavformat/gopher.c

   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 Libav.
   9  *
  10  * Libav 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  * Libav 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 Libav; 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 {
  32     URLContext *hd;
  33 } GopherContext;
  34
  35 static int gopher_write(URLContext *h, const uint8_t *buf, int size)
  36 {
  37     GopherContext *s = h->priv_data;
  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:
  53             av_log(h, AV_LOG_WARNING,
  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
  68 static int gopher_close(URLContext *h)
  69 {
  70     GopherContext *s = h->priv_data;
  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 {
  80     GopherContext *s = h->priv_data;
  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,
  97                      &h->interrupt_callback, 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
 117 URLProtocol ff_gopher_protocol = {
 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),
 124     .flags          = URL_PROTOCOL_FLAG_NETWORK,
 125 };