Add BufferedPacket

Add PacketProtocol.getOutgoingId(Packet) to get id from BufferedPacket
Change TcpPacketCodec.encode to use Packet instance instead of its class

src/main/java/com/github/steveice10/packetlib/packet/BufferedPacket.java

@@ -0,0 +1,36 @@
+package com.github.steveice10.packetlib.packet;
+
+import com.github.steveice10.packetlib.io.NetInput;
+import com.github.steveice10.packetlib.io.NetOutput;
+
+import java.io.EOFException;
+import java.io.IOException;
+
+public class BufferedPacket implements Packet {
+    private Class<? extends Packet> packetClass;
+    private byte[] buf;
+
+    public BufferedPacket(Class<? extends Packet> packetClass, byte[] buf) {
+        this.packetClass = packetClass;
+        this.buf = buf;
+    }
+
+    public Class<? extends Packet> getPacketClass() {
+        return packetClass;
+    }
+
+    @Override
+    public void read(NetInput in) throws IOException {
+        throw new EOFException("BufferedPacket can not be read");
+    }
+
+    @Override
+    public void write(NetOutput out) throws IOException {
+        out.writeBytes(buf);
+    }
+
+    @Override
+    public boolean isPriority() {
+        return true;
+    }
+}

src/main/java/com/github/steveice10/packetlib/packet/PacketProtocol.java

@@ -132,15 +132,30 @@ public abstract class PacketProtocol {
     /**
      * Gets the registered id of an outgoing packet class.
      *
-     * @param packet Class of the packet to get the id for.
+     * @param packetClass Class of the packet to get the id for.
      * @return The packet's registered id.
      * @throws IllegalArgumentException If the packet is not registered.
      */
-    public final int getOutgoingId(Class<? extends Packet> packet) {
-        if(!this.outgoing.containsKey(packet) || this.outgoing.get(packet) == null) {
-            throw new IllegalArgumentException("Unregistered outgoing packet class: " + packet.getName());
+    public final int getOutgoingId(Class<? extends Packet> packetClass) {
+        if(!this.outgoing.containsKey(packetClass) || this.outgoing.get(packetClass) == null) {
+            throw new IllegalArgumentException("Unregistered outgoing packet class: " + packetClass.getName());
         }
 
-        return this.outgoing.get(packet);
+        return this.outgoing.get(packetClass);
+    }
+
+    /**
+     * Gets the registered id of an outgoing {@link Packet} instance.
+     *
+     * @param packet Instance of {@link Packet} to get the id for.
+     * @return The packet's registered id.
+     * @throws IllegalArgumentException If the packet is not registered.
+     */
+    public final int getOutgoingId(Packet packet) {
+        if(packet instanceof BufferedPacket) {
+            return getOutgoingId(((BufferedPacket)packet).getPacketClass());
+        }
+
+        return getOutgoingId(packet.getClass());
     }
 }

src/main/java/com/github/steveice10/packetlib/tcp/TcpPacketCodec.java

@@ -23,7 +23,7 @@ public class TcpPacketCodec extends ByteToMessageCodec<Packet> {
     @Override
     public void encode(ChannelHandlerContext ctx, Packet packet, ByteBuf buf) throws Exception {
         NetOutput out = new ByteBufNetOutput(buf);
-        this.session.getPacketProtocol().getPacketHeader().writePacketId(out, this.session.getPacketProtocol().getOutgoingId(packet.getClass()));
+        this.session.getPacketProtocol().getPacketHeader().writePacketId(out, this.session.getPacketProtocol().getOutgoingId(packet));
         packet.write(out);
     }