content: package net.sf.runjva.sourceforge.jsocks.protocol;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.net.InetAddress;
  import java.net.UnknownHostException;
  
  /**
   * Abstract class which describes SOCKS4/5 response/request.
   */
  public abstract class ProxyMessage {
  
  	/** Host as an IP address */
  	public InetAddress ip = null;
  
  	/** SOCKS version, or version of the response for SOCKS4 */
  	public int version;
  
  	/** Port field of the request/response */
  	public int port;
  
  	/** Request/response code as an int */
  	public int command;
  
  	/** Host as string. */
  	public String host = null;
  
  	/** User field for SOCKS4 request messages */
  	public String user = null;
  
  	ProxyMessage(int command, InetAddress ip, int port) {
  		this.command = command;
  		this.ip = ip;
  		this.port = port;
  	}
  
  	ProxyMessage() {
  	}
  
  	/**
  	 * Initialises Message from the stream. Reads server response from given
  	 * stream.
  	 * 
  	 * @param in
  	 *            Input stream to read response from.
  	 * @throws SocksException
  	 *             If server response code is not SOCKS_SUCCESS(0), or if any
  	 *             error with protocol occurs.
  	 * @throws IOException
  	 *             If any error happens with I/O.
  	 */
  	public abstract void read(InputStream in) throws SocksException,
  			IOException;
  
  	/**
  	 * Initialises Message from the stream. Reads server response or client
  	 * request from given stream.
  	 * 
  	 * @param in
  	 *            Input stream to read response from.
  	 * @param client_mode
  	 *            If true read server response, else read client request.
  	 * @throws SocksException
  	 *             If server response code is not SOCKS_SUCCESS(0) and reading
  	 *             in client mode, or if any error with protocol occurs.
  	 * @throws IOException
  	 *             If any error happens with I/O.
  	 */
  	public abstract void read(InputStream in, boolean client_mode)
  			throws SocksException, IOException;
  
  	/**
  	 * Writes the message to the stream.
  	 * 
  	 * @param out
  	 *            Output stream to which message should be written.
  	 */
  	public abstract void write(OutputStream out) throws SocksException,
  			IOException;
  
  	/**
  	 * Get the Address field of this message as InetAddress object.
  	 * 
  	 * @return Host address or null, if one can't be determined.
  	 */
  	public InetAddress getInetAddress() throws UnknownHostException {
  		return ip;
  	}
  
  	/**
  	 * Get string representaion of this message.
  	 * 
  	 * @return string representation of this message.
  	 */
  	public String toString() {
  		return "Proxy Message:\n" + "Version:" + version + "\n" + "Command:"
  				+ command + "\n" + "IP:     " + ip + "\n" + "Port:   " + port
  				+ "\n" + "User:   " + user + "\n";
  	}
  
  	// Package methods
  	// ////////////////
  
  	static final String bytes2IPV4(byte[] addr, int offset) {
  		String hostName = "" + (addr[offset] & 0xFF);
  		for (int i = offset + 1; i < offset + 4; i++) {
  			hostName += "." + (addr[i] & 0xFF);
  		}
  		return hostName;
  	}
  
  	static final String bytes2IPV6(byte[] addr, int offset) {
  		// Have no idea how they look like!
  		return null;
  	}
  
  }
  