PeerStreamer

/*

 * Gopher protocol

 *

 * Copyright (c) 2009 Toshimitsu Kimura

 *

 * based on libavformat/http.c, Copyright (c) 2000, 2001 Fabrice Bellard

 *

 * This file is part of Libav.

 *

 * Libav 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.

 *

 * Libav 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 Libav; 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(NULL, 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;

    }

    av_freep(&h->priv_data);

    return 0;

}

static int gopher_open(URLContext *h, const char *uri, int flags)

{

    GopherContext *s;

    char hostname[1024], auth[1024], path[1024], buf[1024];

    int port, err;

    h->is_streamed = 1;

    s = av_malloc(sizeof(GopherContext));

    if (!s) {

        return AVERROR(ENOMEM);

    }

    h->priv_data = s;

    /* 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_RDWR);

    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 = {

    "gopher",

    gopher_open,

    gopher_read,

    gopher_write,

    NULL, /*seek*/

    gopher_close,

};