ClientPacketHandler.java

package portables.client.network;

import cpw.mods.fml.common.eventhandler.SubscribeEvent;
import cpw.mods.fml.common.network.FMLNetworkEvent.ClientCustomPacketEvent;
import io.netty.buffer.ByteBufInputStream;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.item.ItemStack;
import net.minecraft.network.NetHandlerPlayServer;

public class ClientPacketHandler
{
	@SubscribeEvent
	public void onServerPacket(ClientCustomPacketEvent event)
	{
		try
		{
			EntityPlayerMP player = ((NetHandlerPlayServer) event.handler).playerEntity;
			ByteBufInputStream bbis = new ByteBufInputStream(event.packet.payload());
			ItemStack currentItem = player.getCurrentEquippedItem();
			byte packetId = bbis.readByte();
		} catch (Exception e)
		{
			e.printStackTrace();
		}
	}
}