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/*
* GopherConnection.java
* Copyright (C) 2003 The Free Software Foundation
*
* This file is part of GNU inetlib, a library.
*
* GNU inetlib is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNU inetlib 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Linking this library statically or dynamically with other modules is
* making a combined work based on this library. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obliged to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
package gnu.inet.gopher;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import gnu.inet.util.CRLFInputStream;
import gnu.inet.util.MessageInputStream;
/**
* A gopher client.
*
* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
*/
public class GopherConnection
{
/**
* The default gopher port.
*/
public static final int DEFAULT_PORT = 80;
protected Socket socket;
protected InputStream in;
protected OutputStream out;
/**
* Creates a new connection to the gopher server at the specified
* hostname.
* @param hostname the hostname
*/
public GopherConnection(String host)
throws IOException
{
this(host, DEFAULT_PORT);
}
/**
* Creates a new connection to the gopher server at the specified
* hostname with the specified non-standard port.
* @param hostname the hostname
* @param port the non-standard port to use
*/
public GopherConnection(String host, int port)
throws IOException
{
if (port <= 0)
{
port = DEFAULT_PORT;
}
socket = new Socket(host, port);
in = socket.getInputStream();
out = socket.getOutputStream();
}
/**
* Returns the directory listing for this gopher server.
* When all entries have been read from the listing, the connection will
* be closed.
*/
public DirectoryListing list()
throws IOException
{
byte[] CRLF = { 0x0d, 0x0a };
out.write(CRLF);
out.flush();
InputStream listStream = new CRLFInputStream(in);
listStream = new MessageInputStream(listStream);
return new DirectoryListing(listStream);
}
/**
* Returns the resource identified by the specified selector.
* If the resource is text-based, it will need to be wrapped in a
* CRLFInputStream.
*/
public InputStream get(String selector)
throws IOException
{
byte[] chars = selector.getBytes("US-ASCII");
byte[] line = new byte[chars.length + 2];
System.arraycopy(chars, 0, line, 0, chars.length);
line[chars.length] = 0x0d;
line[chars.length + 1] = 0x0a;
out.write(line);
out.flush();
return in;
}
}
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