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/*
* $Id: GopherConnection.java,v 1.3 2004/06/07 20:12:50 dog Exp $
* 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
*
* As a special exception, if you link this library with other files to
* produce an executable, this library does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* This exception does not however invalidate any other reasons why the
* executable file might be covered by the GNU General Public License.
*/
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>
* @version $Revision: 1.3 $ $Date: 2004/06/07 20:12:50 $
*/
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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