Package org.jmule.core.jkad.routingtable

Source Code of org.jmule.core.jkad.routingtable.NodesDat

/*
*  JMule - Java file sharing client
*  Copyright (C) 2007-2008 JMule team ( jmule@jmule.org / http://jmule.org )
*
*  Any parts of this program derived from other projects, or contributed
*  by third-party developers are copyrighted by their respective authors.
*
*  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.
*
*  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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*
*/
package org.jmule.core.jkad.routingtable;

import static org.jmule.core.jkad.JKadConstants.NODES_DAT_VERSION;
import static org.jmule.core.utils.Convert.intToShort;
import static org.jmule.core.utils.Misc.getByteBuffer;

import java.io.FileOutputStream;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.LinkedList;
import java.util.List;

import org.jmule.core.jkad.ClientID;
import org.jmule.core.jkad.ContactAddress;
import org.jmule.core.jkad.IPAddress;
import org.jmule.core.jkad.JKadUDPKey;
import org.jmule.core.jkad.utils.Utils;
import org.jmule.core.utils.Convert;

/**
* Created on Dec 29, 2008
* @author binary256
* @version $Revision: 1.4 $
* Last changed by $Author: binary255 $ on $Date: 2009/10/25 12:15:05 $
*/
public class NodesDat {

  /**
   *
   * @param fileName
   * @return
   */
  public static List<KadContact> loadFile(String fileName) {
    List<KadContact> result = new LinkedList<KadContact>();
   
    try {
      FileChannel channel = new RandomAccessFile(fileName,"rw").getChannel();
     
      ByteBuffer data = getByteBuffer(4);
      channel.position(4); // skip 'old' contacts count field
     
      channel.read(data); // nodes.dat version
     
      data.position(0);
      channel.read(data);
     
      int totalContacts = data.getInt(0);
     
      for(int i = 1 ; i <= totalContacts ; i++) {
       
        data = getByteBuffer(16);
        channel.read(data);
        ClientID contact_id = new ClientID(data.array());
        data = getByteBuffer(4);
        channel.read(data);
        byte[] ip = data.array().clone();
        //ip = Convert.reverseArray(ip);
        IPAddress address = new IPAddress(ip);
       
        data = getByteBuffer(2);
        channel.read(data);
        short udp_port = data.getShort(0);
       
        data = getByteBuffer(2);
        channel.read(data);
        short tcp_port = data.getShort(0);
       
        data = getByteBuffer(1);
        channel.read(data);
        byte contact_version = data.get(0);
       
        data = getByteBuffer(4);
        channel.read(data);
       
        ByteBuffer data2 = getByteBuffer(4);
        channel.read(data2);
       
        JKadUDPKey udp_key = new JKadUDPKey(data.array(), data2.array());
       
        data = getByteBuffer(1);
        channel.read(data);

        if (Utils.isGoodAddress(address)) {
          KadContact contact = new KadContact(contact_id, new ContactAddress(address, Convert.shortToInt(udp_port)), Convert.shortToInt(tcp_port), contact_version, udp_key, data.get(0)==1 ? true : false);
         
          result.add(contact);
        }
      }
     
      channel.close();
    }catch(Throwable t) {
      t.printStackTrace();
    }
   
    return result;
  }
 
  /**
   *
   * @param fileName
   * @param contactList
   */
  public static void writeFile(String fileName, List<KadContact> contactList) {
    try {
      FileChannel channel = new FileOutputStream(fileName).getChannel();
      ByteBuffer data = getByteBuffer(4);
     
      channel.write(data);
     
      data.position(0);
      data.put(NODES_DAT_VERSION);
      data.position(0);
      channel.write(data);
     
      data.position(0);
      data.putInt(contactList.size());
      data.position(0);
      channel.write(data);
     
      for(KadContact contact : contactList) {
        data = getByteBuffer(16);
        data.put(contact.getContactID().toByteArray());
        data.position(0);
        channel.write(data);
       
        data = getByteBuffer(4);
        data.put(contact.getIPAddress().getAddress());
        data.position(0);
        channel.write(data);
       
        data  = getByteBuffer(2);
        data.putShort(intToShort(contact.getUDPPort()));
        data.position(0);
        channel.write(data);
       
        data  = getByteBuffer(2);
        data.putShort(intToShort(contact.getTCPPort()));
        data.position(0);
        channel.write(data);
       
        data  = getByteBuffer(1);
        data.put(contact.getVersion());
        data.position(0);
        channel.write(data);
       
        // write key
        JKadUDPKey key = contact.getKadUDPKey();
        if (key == null) {
          data  = getByteBuffer(4 + 4);
          data.position(0);
          channel.write(data);
        } else {
          data  = getByteBuffer(4 + 4);
          data.put(key.getKey());
          data.put(key.getAddress().getAddress());
          data.position(0);
          channel.write(data);
        }
       
        data = getByteBuffer(1);
        data.put((byte)(contact.isIPVerified() ? 1 : 0));
        data.position(0);
        channel.write(data);
      }
     
      channel.close();
    } catch (Throwable t) {
      t.printStackTrace();
    }
  }
 
}
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