/*
  * Gopher protocol
  *
  * Copyright (c) 2009 Toshimitsu Kimura
  *
  * based on libavformat/http.c, Copyright (c) 2000, 2001 Fabrice Bellard
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "libavutil/avstring.h"
 #include "avformat.h"

 #include "internal.h"

 #include "network.h"

 #include "url.h"

 
 typedef struct {
     URLContext *hd;
 } GopherContext;
 

 static int gopher_write(URLContext *h, const uint8_t *buf, int size)

 {
     GopherContext *s = h->priv_data;

     return ffurl_write(s->hd, buf, size);

 }
 
 static int gopher_connect(URLContext *h, const char *path)
 {
     char buffer[1024];
 
     if (!*path) return AVERROR(EINVAL);
     switch (*++path) {
         case '5':
         case '9':
             path = strchr(path, '/');
             if (!path) return AVERROR(EINVAL);
             break;
         default:

             av_log(h, AV_LOG_WARNING,

                    "Gopher protocol type '%c' not supported yet!\n",
                    *path);
             return AVERROR(EINVAL);
     }
 
     /* send gopher sector */
     snprintf(buffer, sizeof(buffer), "%s\r\n", path);
 
     if (gopher_write(h, buffer, strlen(buffer)) < 0)
         return AVERROR(EIO);
 
     return 0;
 }
 
 static int gopher_close(URLContext *h)
 {
     GopherContext *s = h->priv_data;
     if (s->hd) {

         ffurl_close(s->hd);

         s->hd = NULL;
     }
     return 0;
 }
 
 static int gopher_open(URLContext *h, const char *uri, int flags)
 {

     GopherContext *s = h->priv_data;

     char hostname[1024], auth[1024], path[1024], buf[1024];
     int port, err;
 
     h->is_streamed = 1;
 
     /* needed in any case to build the host string */

     av_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,

                  path, sizeof(path), uri);

 
     if (port < 0)
         port = 70;
 

     ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port, NULL);

 
     s->hd = NULL;

     err = ffurl_open(&s->hd, buf, AVIO_FLAG_READ_WRITE,
                      &h->interrupt_callback, NULL);

     if (err < 0)
         goto fail;
 
     if ((err = gopher_connect(h, path)) < 0)
         goto fail;
     return 0;
  fail:
     gopher_close(h);
     return err;
 }
 
 static int gopher_read(URLContext *h, uint8_t *buf, int size)
 {
     GopherContext *s = h->priv_data;

     int len = ffurl_read(s->hd, buf, size);

     return len;
 }
 
 

 URLProtocol ff_gopher_protocol = {

     .name           = "gopher",
     .url_open       = gopher_open,
     .url_read       = gopher_read,
     .url_write      = gopher_write,
     .url_close      = gopher_close,

     .priv_data_size = sizeof(GopherContext),

     .flags          = URL_PROTOCOL_FLAG_NETWORK,

 };