| 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 { |
| 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 | }; |