Added support for Packets for ItemStacks

src/com/builtbroken/minecraft/network/ISimpleItemPacketReceiver.java

@@ -0,0 +1,11 @@
+package com.builtbroken.minecraft.network;
+
+import com.google.common.io.ByteArrayDataInput;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.ItemStack;
+
+public interface ISimpleItemPacketReceiver
+{
+    public boolean simplePacket(EntityPlayer player, ItemStack stack, String id, ByteArrayDataInput data);
+}

src/com/builtbroken/minecraft/network/ISimplePacketReceiver.java

@@ -16,5 +16,6 @@ public interface ISimplePacketReceiver
      * @param data - data from the packet, after location has been read
      * @param player - player that the packet was sent to or came from
      * @return true if the packet was used */
-    public boolean simplePacket(String id, ByteArrayDataInput data, Player player);
+    public boolean simplePacket(String id, ByteArrayDataInput data, Player player);    
+    
 }

src/com/builtbroken/minecraft/network/PacketHandler.java

@@ -44,6 +44,7 @@ public class PacketHandler implements IPacketHandler
         registerManager(new PacketManagerTile());
         registerManager(PacketManagerKeyEvent.instance());
         registerManager(new PacketManagerEntity());
+        registerManager(new PacketManagerItem());
     }
 
     public static void registerManager(IPacketManager manager)

src/com/builtbroken/minecraft/network/PacketManagerItem.java

@@ -0,0 +1,96 @@
+package com.builtbroken.minecraft.network;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.ItemStack;
+import net.minecraft.network.INetworkManager;
+import net.minecraft.network.packet.Packet;
+import net.minecraft.network.packet.Packet250CustomPayload;
+
+import com.google.common.io.ByteArrayDataInput;
+
+import cpw.mods.fml.common.network.Player;
+
+/** Helps update the server or client with general information about an item. Should mostly be used
+ * for GUIs or render effects.
+ * 
+ * @author DarkGuardsman */
+public class PacketManagerItem implements IPacketManager
+{
+    static int packetID = 0;
+
+    @Override
+    public int getID()
+    {
+        return packetID;
+    }
+
+    @Override
+    public void setID(int maxID)
+    {
+        packetID = maxID;
+    }
+
+    @Override
+    public void handlePacket(INetworkManager network, Packet250CustomPayload packet, Player player, ByteArrayDataInput data)
+    {
+        try
+        {
+            EntityPlayer entityPlayer = (EntityPlayer) player;
+            String id = data.readUTF();
+            int slot = data.readInt();
+            ItemStack stack = null;
+            if (slot >= 0)
+            {
+                stack = entityPlayer.inventory.getStackInSlot(slot);
+            }
+            else if (slot == -1)
+            {
+                stack = entityPlayer.getHeldItem();
+            }
+            if (stack != null & stack.getItem() != null)
+            {
+                if (stack.getItem() instanceof ISimpleItemPacketReceiver)
+                {
+                    ((ISimpleItemPacketReceiver) stack.getItem()).simplePacket(entityPlayer, stack, id, data);
+                }
+            }
+        }
+        catch (Exception e)
+        {
+            System.out.println("[CoreLibrary] Error reading packet for item data");
+            e.printStackTrace();
+        }
+    }
+
+    @SuppressWarnings("resource")
+    public static Packet getPacket(EntityPlayer player, String channelName, String id, int slot, Object... dataToSend)
+    {
+        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
+        DataOutputStream data = new DataOutputStream(bytes);
+
+        try
+        {
+            data.writeInt(packetID);
+            data.writeUTF(id);
+            data.writeInt(slot);
+            data = PacketHandler.instance.encodeDataStream(data, dataToSend);
+
+            Packet250CustomPayload packet = new Packet250CustomPayload();
+            packet.channel = channelName;
+            packet.data = bytes.toByteArray();
+            packet.length = packet.data.length;
+
+            return packet;
+        }
+        catch (IOException e)
+        {
+            System.out.println("Failed to create packet.");
+            e.printStackTrace();
+        }
+        return null;
+    }
+}