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 31typedef struct { 32 URLContext *hd; 33} GopherContext; 34 35static 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 41static 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 68static 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 78static 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 109static 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 117URLProtocol 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}; 126