Add support for legacy mod packet IDs (such as 211). May fix issue #32

ProtocolLib/src/main/java/com/comphenix/protocol/PacketType.java

@@ -631,6 +631,29 @@ public class PacketType implements Serializable {
 		return getLookup().getFromCurrent(protocol, sender, packetId) != null;
 	}
 	
+	/**
+	 * Retrieve a packet type from a legacy ID.
+	 * <p>
+	 * If no associated packet type could be found, a new will be registered under LEGACY.
+	 * @param id - the legacy ID.
+	 * @param sender - the sender of the packet, or NULL if unknown.
+	 * @return The packet type.
+	 * @throws IllegalArgumentException If the sender is NULL and the packet doesn't exist.
+	 */
+	public static PacketType fromLegacy(int id, Sender sender) {
+		PacketType type = getLookup().getFromLegacy(id);
+		
+		if (type == null) {
+			if (sender == null)
+				throw new IllegalArgumentException("Cannot find legacy packet " + id);
+			type = newLegacy(sender, id);
+			
+			// As below
+			scheduleRegister(type, "Dynamic-" + UUID.randomUUID().toString());
+		}
+		return type;
+	}
+	
 	/**
 	 * Retrieve a packet type from a protocol, sender and packet ID.
 	 * <p>

ProtocolLib/src/main/java/com/comphenix/protocol/injector/PacketFilterManager.java

@@ -1018,7 +1018,7 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 	@Override
 	@Deprecated
 	public int getPacketID(Object packet) {
-		return getPacketType(packet).getLegacyId();
+		return PacketRegistry.getPacketID(packet.getClass());
 	}
 
 	@Override

ProtocolLib/src/main/java/com/comphenix/protocol/injector/packet/PacketRegistry.java

@@ -396,11 +396,25 @@ public class PacketRegistry {
 	 * @return The packet type, or NULL if not found.
 	 */
 	public static PacketType getPacketType(Class<?> packet) {
+		return getPacketType(packet, null);
+	}
+	
+	/**
+	 * Retrieve the packet type of a given packet.
+	 * @param packet - the class of the packet.
+	 * @param sender - the sender of the packet, or NULL.
+	 * @return The packet type, or NULL if not found.
+	 */
+	public static PacketType getPacketType(Class<?> packet, Sender sender) {
 		initialize();
 		
-		if (NETTY != null)
+		if (NETTY != null) {
 			return NETTY.getPacketClassLookup().get(packet);
+		} else {
 			final int id = LEGACY.getPacketID(packet);
-		return PacketType.hasLegacy(id) ? PacketType.findLegacy(id) : null;
+			
+			return PacketType.hasLegacy(id) ? 
+					PacketType.fromLegacy(id, sender) : null;
+		}
 	}
 }