/*
 * File    : PRUDPPacketReplyConnect.java
 * Created : 20-Jan-2004
 * By      : parg
 * 
 * Azureus - a Java Bittorrent client
 *
 * This program 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.
 *
 * This program 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 ( see the LICENSE file ).
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package com.aelitis.azureus.core.dht.transport.udp.impl;

/**
 * @author parg
 *
 */

import java.util.*;

import java.io.*;
import java.net.InetSocketAddress;

import com.aelitis.azureus.core.dht.transport.DHTTransportContact;
import com.aelitis.azureus.core.dht.transport.udp.impl.packethandler.DHTUDPPacketNetworkHandler;

public class 
DHTUDPPacketReplyQueryStorage
	extends DHTUDPPacketReply
{
	private int					random_id;
	private int					header_length;
	private List<byte[]>		response;
	
	public
	DHTUDPPacketReplyQueryStorage(
		DHTTransportUDPImpl		transport,
		int						trans_id,
		long					conn_id,
		DHTTransportContact		local_contact,
		DHTTransportContact		remote_contact )
	{
		super( transport, DHTUDPPacketHelper.ACT_REPLY_QUERY_STORE, trans_id, conn_id, local_contact, remote_contact );
	}
	
	protected
	DHTUDPPacketReplyQueryStorage(
		DHTUDPPacketNetworkHandler		network_handler,
		InetSocketAddress				originator,
		DataInputStream					is,
		int								trans_id )
	
		throws IOException
	{
		super( network_handler, originator, is, DHTUDPPacketHelper.ACT_REPLY_QUERY_STORE, trans_id );
		
		short size = is.readShort();
		
		response = new ArrayList<byte[]>( size );
		
		if ( size > 0 ){

			header_length = is.readByte()&0xff;
			
			byte[]	bitmap = new byte[size+7/8];

			is.read( bitmap );
			
			int	pos		= 0;
			
			int	current	= 0;
			
			for (int i=0;i<size;i++){
			
				if ( i % 8 == 0 ){
					
					current = bitmap[pos++]&0xff;
				}
				
				if (( current&0x80)!=0 ){
					
					byte[]	x = new byte[header_length];
					
					is.read( x );
					
					response.add( x );
					
				}else{
					
					response.add( null );
				}
				
				current <<= 1;
			}
		}
	}
	
	public void
	serialise(
		DataOutputStream	os )
	
		throws IOException
	{
		super.serialise(os);
		
		int	size = response.size();
		
		os.writeShort( size );

		if ( size > 0 ){
			
			os.writeByte( header_length );
			
			byte[]	bitmap = new byte[size+7/8];
			
			int	bitmap_pos		= 0;
			int	current_byte	= 0;
			int	pos 			= 0;
			
			for ( byte[] x: response ){
				
				current_byte = current_byte << 1;
				
				if ( x != null){
					
					current_byte += 1;
				}
				
				if (( pos %8 ) == 7 ){
					
					bitmap[bitmap_pos++] = (byte)current_byte;
					
					current_byte = 0;
				}
				
				pos++;
			}
			
			if (( pos % 8 ) != 0 ){
				
				bitmap[bitmap_pos++] = (byte)(current_byte << (8 - (pos % 8)));
			}
			
			os.write( bitmap );
			
			for ( byte[] x: response ){

				if ( x != null ){
				
					os.write( x );
				}
			}
		}
	}
	
	protected void
	setRandomID(
		int		id )
	{
		random_id	= id;
	}
	
	protected int
	getRandomID()
	{
		return( random_id );
	}
	
	protected void
	setResponse(
		int				_header_length,
		List<byte[]>	_response )
	{
		header_length	= _header_length;
		response		= _response;
	}
	
	protected List<byte[]>
	getResponse()
	{
		return( response );
	}
}
