Someone

package net.sf.l2j.gameserver;

import java.nio.ByteBuffer;

import net.sf.l2j.gameserver.clientpackets.ClientBasePacket;

/**
 * This interface can be implemented by custom extensions to l2j to get packets
 * before the normal processing of PacketHandler
 * 
 * @version $Revision: $ $Date: $
 * @author  galun
 */
public interface CustomPacketHandlerInterface {

    /**
     * interface for a custom packethandler to ckeck received packets
     * PacketHandler will take care of the packet if this function returns null. 
     * @param data the packet
     * @param client the ClientThread
     * @return a ClientBasePacket if the packet has been processed, null otherwise
     */
    public ClientBasePacket handlePacket(ByteBuffer data, ClientThread client);
}


Index: /home/jru199/trunk/L2_GameServer_c4/java/net/sf/l2j/gameserver/PacketHandler.java
===================================================================
--- /home/jru199/trunk/L2_GameServer_c4/java/net/sf/l2j/gameserver/PacketHandler.java	(revision 1898)
+++ /home/jru199/trunk/L2_GameServer_c4/java/net/sf/l2j/gameserver/PacketHandler.java	(working copy)
@@ -19,6 +19,7 @@
 package net.sf.l2j.gameserver; 
  
 import java.nio.ByteBuffer; 
+import java.util.LinkedList; 
 import java.util.logging.Logger; 
  
 import net.sf.l2j.Config; 
@@ -34,6 +35,7 @@
 public class PacketHandler 
 { 
 	private static Logger _log = Logger.getLogger(PacketHandler.class.getName()); 
+    private static LinkedList<CustomPacketHandlerInterface> customhandlers = new LinkedList<CustomPacketHandlerInterface>(); 
  
 	private PacketHandler() 
 	{ 
@@ -39,7 +41,14 @@
 	{ 
 	} 
 	 
-	 
+	public static void addCustomHandler(CustomPacketHandlerInterface handler) { 
+	    customhandlers.add(handler);    
+	} 
+ 
+    public static void removeCustomHandler(CustomPacketHandlerInterface handler) { 
+        customhandlers.remove(handler);    
+    } 
+ 
 	public static ClientBasePacket handlePacket(ByteBuffer data, ClientThread client) 
 	{ 
 		ClientBasePacket msg = null; 
@@ -44,7 +53,14 @@
 	{ 
 		ClientBasePacket msg = null; 
 		int id = data.get() & 0xff; 
-		 
+ 
+        for (CustomPacketHandlerInterface handler : customhandlers) { 
+            msg = handler.handlePacket(data, client); 
+            if (msg != null) 
+                break; 
+        } 
+ 
+        if (msg == null) 
 		switch(id) 
 		{ 
 			case 0x00: