Adding support for Spigot MCPC 1.2.5.

Very buggy indeed.

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

@@ -270,7 +270,7 @@ public class CommandFilter extends CommandBase {
 	}
 
 	/*
-	 * Description: Adds or removes a simple packet listener.
+	 * Description: Adds or removes a simple packet filter.
        Usage:       /<command> add|remove name [packet IDs]
 	 */
 	@Override

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

@@ -340,6 +340,8 @@ class CommandPacket extends CommandBase {
 			supported.addAll(Packets.Client.getSupported());
 		else if (side.isForServer())
 			supported.addAll(Packets.Server.getSupported());
+		
+		System.out.println("Supported for " + side + ": " + supported);
 		return supported;
 	}
 	

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

@@ -229,7 +229,7 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 				reporter.reportWarning(this, "Cannot load server and client packet list.", e);
 			}
 
-		} catch (IllegalAccessException e) {
+		} catch (FieldAccessException e) {
 			reporter.reportWarning(this, "Unable to initialize packet injector.", e);
 		}
 	}
@@ -757,7 +757,14 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 		if (!MinecraftReflection.isPacketClass(packet))
 			throw new IllegalArgumentException("The given object " + packet + " is not a packet.");
 		
-		return PacketRegistry.getPacketToID().get(packet.getClass());
+		Integer id = PacketRegistry.getPacketToID().get(packet.getClass());
+		
+		if (id != null) {
+			return id;
+		} else {
+			throw new IllegalArgumentException(
+					"Unable to find associated packet of " + packet + ": Lookup returned NULL.");
+		}
 	}
 	
 	@Override

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

@@ -8,6 +8,7 @@ import com.comphenix.protocol.error.ErrorReporter;
 import com.comphenix.protocol.injector.ListenerInvoker;
 import com.comphenix.protocol.injector.PacketFilterManager;
 import com.comphenix.protocol.injector.player.PlayerInjectionHandler;
+import com.comphenix.protocol.reflect.FieldAccessException;
 import com.google.common.base.Preconditions;
 
 /**
@@ -100,9 +101,9 @@ public class PacketInjectorBuilder {
 	 * <p>
 	 * Note that any non-null builder parameters must be set.
 	 * @return The created injector.
-	 * @throws IllegalAccessException If anything goes wrong in terms of reflection.
+	 * @throws FieldAccessException If anything goes wrong in terms of reflection.
 	 */
-	public PacketInjector buildInjector() throws IllegalAccessException {
+	public PacketInjector buildInjector() throws FieldAccessException {
 		initializeDefaults();
 		return new ProxyPacketInjector(classLoader, invoker, playerInjection, reporter);
 	}

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

@@ -25,10 +25,15 @@ import java.util.Set;
 
 import net.sf.cglib.proxy.Factory;
 
+import com.comphenix.protocol.ProtocolLibrary;
 import com.comphenix.protocol.reflect.FieldAccessException;
 import com.comphenix.protocol.reflect.FieldUtils;
 import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.comphenix.protocol.reflect.fuzzy.FuzzyClassContract;
+import com.comphenix.protocol.reflect.fuzzy.FuzzyFieldContract;
+import com.comphenix.protocol.reflect.fuzzy.FuzzyMethodContract;
 import com.comphenix.protocol.utility.MinecraftReflection;
+import com.comphenix.protocol.wrappers.TroveWrapper;
 import com.google.common.base.Objects;
 import com.google.common.collect.ImmutableSet;
 
@@ -39,6 +44,8 @@ import com.google.common.collect.ImmutableSet;
  */
 @SuppressWarnings("rawtypes")
 public class PacketRegistry {
+	private static final int MIN_SERVER_PACKETS = 5;
+	private static final int MIN_CLIENT_PACKETS = 5;
 
 	// Fuzzy reflection
 	private static FuzzyReflection packetRegistry;
@@ -67,6 +74,14 @@ public class PacketRegistry {
 			try {
 				Field packetsField = getPacketRegistry().getFieldByType("packetsField", Map.class);
 				packetToID = (Map<Class, Integer>) FieldUtils.readStaticField(packetsField, true);
+			} catch (IllegalArgumentException e) {
+				// Spigot 1.2.5 MCPC workaround
+				try {
+					packetToID = getSpigotWrapper();
+				} catch (Exception e2) {
+					// Very bad indeed
+					throw new IllegalArgumentException(e.getMessage() + "; Spigot workaround failed.", e2);
+				}
 				
 			} catch (IllegalAccessException e) {
 				throw new RuntimeException("Unable to retrieve the packetClassToIdMap", e);
@@ -76,6 +91,40 @@ public class PacketRegistry {
 		return packetToID;
 	}
 	
+	private static Map<Class, Integer> getSpigotWrapper() throws IllegalAccessException {
+		// If it talks like a duck, etc.
+		// Perhaps it would be nice to have a proper duck typing library as well
+		FuzzyClassContract mapLike = FuzzyClassContract.newBuilder().
+				method(FuzzyMethodContract.newBuilder().
+						nameExact("size").returnTypeExact(int.class)).
+				method(FuzzyMethodContract.newBuilder().
+						nameExact("put").parameterCount(2)).
+				method(FuzzyMethodContract.newBuilder().
+						nameExact("get").parameterCount(1)).
+				build();
+		
+		Field packetsField = getPacketRegistry().getField(
+				FuzzyFieldContract.newBuilder().typeMatches(mapLike).build());
+		Object troveMap = FieldUtils.readStaticField(packetsField, true);
+		
+		// Check for stupid no_entry_values
+		try {
+			Field field = FieldUtils.getField(troveMap.getClass(), "no_entry_value", true);
+			Integer value = (Integer) FieldUtils.readField(field, troveMap, true);
+			
+			if (value >= 0 && value < 256) {
+				// Someone forgot to set the no entry value. Let's help them.
+				FieldUtils.writeField(field, troveMap, -1);
+			}
+		} catch (IllegalArgumentException e) {
+			// Whatever
+			ProtocolLibrary.getErrorReporter().reportWarning(PacketRegistry.class, "Unable to correct no entry value.", e);
+		}
+		
+		// We'll assume this a Trove map
+		return TroveWrapper.getDecoratedMap(troveMap);
+	}
+	
 	/**
 	 * Retrieve the cached fuzzy reflection instance allowing access to the packet registry.
 	 * @return Reflected packet registry.
@@ -109,6 +158,10 @@ public class PacketRegistry {
 	 */
 	public static Set<Integer> getServerPackets() throws FieldAccessException {
 		initializeSets();
+		
+		// Sanity check. This is impossible!
+		if (serverPackets != null && serverPackets.size() < MIN_SERVER_PACKETS) 
+			throw new FieldAccessException("Server packet list is empty. Seems to be unsupported");
 		return serverPackets;
 	}
 	
@@ -119,6 +172,10 @@ public class PacketRegistry {
 	 */
 	public static Set<Integer> getClientPackets() throws FieldAccessException {
 		initializeSets();
+		
+		// As above
+		if (clientPackets != null && clientPackets.size() < MIN_CLIENT_PACKETS) 
+			throw new FieldAccessException("Client packet list is empty. Seems to be unsupported");
 		return clientPackets;
 	}
 	
@@ -140,6 +197,14 @@ public class PacketRegistry {
 					serverPackets = ImmutableSet.copyOf(serverPacketsRef);
 					clientPackets = ImmutableSet.copyOf(clientPacketsRef);
 					
+					// Check sizes
+					if (serverPackets.size() < MIN_SERVER_PACKETS)
+						ProtocolLibrary.getErrorReporter().reportWarning(
+							PacketRegistry.class, "Too few server packets detected: " + serverPackets.size());
+					if (clientPackets.size() < MIN_CLIENT_PACKETS)
+						ProtocolLibrary.getErrorReporter().reportWarning(
+							PacketRegistry.class, "Too few client packets detected: " + clientPackets.size());
+					
 				} else {
 					throw new FieldAccessException("Cannot retrieve packet client/server sets.");
 				}

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

@@ -37,6 +37,7 @@ import com.comphenix.protocol.events.PacketContainer;
 import com.comphenix.protocol.events.PacketEvent;
 import com.comphenix.protocol.injector.ListenerInvoker;
 import com.comphenix.protocol.injector.player.PlayerInjectionHandler;
+import com.comphenix.protocol.reflect.FieldAccessException;
 import com.comphenix.protocol.reflect.FieldUtils;
 import com.comphenix.protocol.reflect.FuzzyReflection;
 import com.comphenix.protocol.reflect.MethodInfo;
@@ -49,6 +50,85 @@ import com.comphenix.protocol.utility.MinecraftReflection;
  * @author Kristian
  */
 class ProxyPacketInjector implements PacketInjector {
+	/**
+	 * Represents a way to update the packet ID to class lookup table.
+	 * @author Kristian
+	 */
+	private static interface PacketClassLookup {
+		public void setLookup(int packetID, Class<?> clazz);
+	}
+	
+	private static class IntHashMapLookup implements PacketClassLookup {
+		// The "put" method that associates a packet ID with a packet class
+		private Method putMethod;
+		private Object intHashMap;
+		
+		public IntHashMapLookup() throws IllegalAccessException {
+			initialize();
+		}
+		
+		@Override
+		public void setLookup(int packetID, Class<?> clazz) {
+			try {
+				putMethod.invoke(intHashMap, packetID, clazz);
+			} catch (IllegalArgumentException e) {
+				throw new RuntimeException("Illegal argument.", e);
+			} catch (IllegalAccessException e) {
+				throw new RuntimeException("Cannot access method.", e);
+			} catch (InvocationTargetException e) {
+				throw new RuntimeException("Exception occured in IntHashMap.put.", e);
+			}
+		}
+
+		private void initialize() throws IllegalAccessException {
+			if (intHashMap == null) {
+				// We're looking for the first static field with a Minecraft-object. This should be a IntHashMap.
+				Field intHashMapField = FuzzyReflection.fromClass(MinecraftReflection.getPacketClass(), true).
+						getFieldByType(MinecraftReflection.getMinecraftObjectRegex());
+				
+				try {
+					intHashMap = FieldUtils.readField(intHashMapField, (Object) null, true);
+				} catch (IllegalArgumentException e) {
+					throw new RuntimeException("Minecraft is incompatible.", e);
+				}
+				
+				// Now, get the "put" method.
+				putMethod = FuzzyReflection.fromObject(intHashMap).
+						getMethodByParameters("put", int.class, Object.class);
+			}
+		}
+	}
+	
+	private static class ArrayLookup implements PacketClassLookup {
+		private Class<?>[] array;
+		
+		public ArrayLookup() throws IllegalAccessException {
+			initialize();
+		}
+		
+		@Override
+		public void setLookup(int packetID, Class<?> clazz) {
+			array[packetID] = clazz;
+		}
+
+		private void initialize() throws IllegalAccessException {
+			FuzzyReflection reflection = FuzzyReflection.fromClass(MinecraftReflection.getPacketClass());
+			
+			// Is there a Class array with 256 elements instead?
+			for (Field field : reflection.getFieldListByType(Class[].class)) {
+				Class<?>[] test = (Class<?>[]) FieldUtils.readField(field, (Object)null);
+				
+				if (test.length == 256) {
+					array = test;
+					return;
+				}
+			}
+			throw new IllegalArgumentException(
+					"Unable to find an array with the type " + Class[].class + 
+					" in " + MinecraftReflection.getPacketClass());
+		}
+	}
+	
 	/**
 	 * Matches the readPacketData(DataInputStream) method in Packet.
 	 */
@@ -58,9 +138,7 @@ class ProxyPacketInjector implements PacketInjector {
 			parameterCount(1).
 			build();
 	
-	// The "put" method that associates a packet ID with a packet class
+	private static PacketClassLookup lookup;
-	private static Method putMethod;
-	private static Object intHashMap;
 	
 	// The packet filter manager
 	private ListenerInvoker manager;
@@ -78,7 +156,7 @@ class ProxyPacketInjector implements PacketInjector {
 	private CallbackFilter filter;
 			
 	public ProxyPacketInjector(ClassLoader classLoader, ListenerInvoker manager, 
-						  PlayerInjectionHandler playerInjection, ErrorReporter reporter) throws IllegalAccessException {
+						  PlayerInjectionHandler playerInjection, ErrorReporter reporter) throws FieldAccessException {
 		
 		this.classLoader = classLoader;
 		this.manager = manager;
@@ -100,20 +178,21 @@ class ProxyPacketInjector implements PacketInjector {
 		}
 	}
 	
-	private void initialize() throws IllegalAccessException {
+	private void initialize() throws FieldAccessException {
-		if (intHashMap == null) {
+		if (lookup == null) {
-			// We're looking for the first static field with a Minecraft-object. This should be a IntHashMap.
+			try {
-			Field intHashMapField = FuzzyReflection.fromClass(MinecraftReflection.getPacketClass(), true).
+				lookup = new IntHashMapLookup();
-					getFieldByType(MinecraftReflection.getMinecraftObjectRegex());
+			} catch (Exception e1) {
 				
 				try { 
-				intHashMap = FieldUtils.readField(intHashMapField, (Object) null, true);
+					lookup = new ArrayLookup();
-			} catch (IllegalArgumentException e) {
+				} catch (Exception e2) {
-				throw new RuntimeException("Minecraft is incompatible.", e);
+					// Wow
+					throw new FieldAccessException(e1.getMessage() + ". Workaround failed too.", e2);
+				}
 			}
 			
-			// Now, get the "put" method.
+			// Should work fine now
-			putMethod = FuzzyReflection.fromObject(intHashMap).getMethodByParameters("put", int.class, Object.class);
 		}
 	}
 	
@@ -173,21 +252,12 @@ class ProxyPacketInjector implements PacketInjector {
 		// Add a static reference
 		Enhancer.registerStaticCallbacks(proxy, new Callback[] { NoOp.INSTANCE, modifierReadPacket, modifierRest });
 		
-		try {
 		// Override values
 		previous.put(packetID, old);
 		registry.put(proxy, packetID);
 		overwritten.put(packetID, proxy);
-			putMethod.invoke(intHashMap, packetID, proxy);
+		lookup.setLookup(packetID, proxy);
 		return true;
-			
-		} catch (IllegalArgumentException e) {
-			throw new RuntimeException("Illegal argument.", e);
-		} catch (IllegalAccessException e) {
-			throw new RuntimeException("Cannot access method.", e);
-		} catch (InvocationTargetException e) {
-			throw new RuntimeException("Exception occured in IntHashMap.put.", e);
-		}
 	}
 	
 	@Override
@@ -200,25 +270,14 @@ class ProxyPacketInjector implements PacketInjector {
 		Map<Integer, Class> previous = PacketRegistry.getPreviousPackets();
 		Map<Integer, Class> overwritten = PacketRegistry.getOverwrittenPackets();
 		
-		// Use the old class definition
-		try {
 		Class old = previous.get(packetID);
 		Class proxy = PacketRegistry.getPacketClassFromID(packetID);
 		
-			putMethod.invoke(intHashMap, packetID, old);
+		lookup.setLookup(packetID, old);
 		previous.remove(packetID);
 		registry.remove(proxy);
 		overwritten.remove(packetID);
 		return true;
-			
-			// Handle some problems
-		} catch (IllegalArgumentException e) {
-			return false;
-		} catch (IllegalAccessException e) {
-			throw new RuntimeException("Cannot access method.", e);
-		} catch (InvocationTargetException e) {
-			throw new RuntimeException("Exception occured in IntHashMap.put.", e);
-		}
 	}
 	
 	@Override

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/TroveWrapper.java

@@ -0,0 +1,104 @@
+package com.comphenix.protocol.wrappers;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import javax.annotation.Nonnull;
+
+import com.comphenix.protocol.reflect.FieldAccessException;
+import com.comphenix.protocol.reflect.fuzzy.AbstractFuzzyMatcher;
+import com.comphenix.protocol.reflect.fuzzy.FuzzyMatchers;
+
+/**
+ * Wrap a GNU Trove Collection class with an equivalent Java Collection class.
+ * @author Kristian
+ */
+public class TroveWrapper {
+	private volatile static Class<?> decorators;
+	
+	/**
+	 * Retrieve a Java wrapper for the corresponding Trove map.
+	 * @param troveMap - the trove map to wrap.
+	 * @return The wrapped GNU Trove map.
+	 * @throws IllegalStateException If GNU Trove cannot be found in the class map.
+	 * @throws IllegalArgumentException If troveMap is NULL.
+	 * @throws FieldAccessException Error in wrapper method or lack of reflection permissions.
+	 */
+	public static <TKey, TValue> Map<TKey, TValue> getDecoratedMap(@Nonnull Object troveMap) {
+		@SuppressWarnings("unchecked")
+		Map<TKey, TValue> result = (Map<TKey, TValue>) getDecorated(troveMap);
+		return result;
+	}
+	
+	/**
+	 * Retrieve a Java wrapper for the corresponding Trove set.
+	 * @param troveSet - the trove set to wrap.
+	 * @return The wrapped GNU Trove set.
+	 * @throws IllegalStateException If GNU Trove cannot be found in the class map.
+	 * @throws IllegalArgumentException If troveSet is NULL.
+	 * @throws FieldAccessException Error in wrapper method or lack of reflection permissions.
+	 */
+	public static <TValue> Set<TValue> getDecoratedSet(@Nonnull Object troveSet) {
+		@SuppressWarnings("unchecked")
+		Set<TValue> result = (Set<TValue>) getDecorated(troveSet);
+		return result;
+	}
+	
+	/**
+	 * Retrieve a Java wrapper for the corresponding Trove list.
+	 * @param troveList - the trove list to wrap.
+	 * @return The wrapped GNU Trove list.
+	 * @throws IllegalStateException If GNU Trove cannot be found in the class map.
+	 * @throws IllegalArgumentException If troveList is NULL.
+	 * @throws FieldAccessException Error in wrapper method or lack of reflection permissions.
+	 */
+	public static <TValue> List<TValue> getDecoratedList(@Nonnull Object troveList) {
+		@SuppressWarnings("unchecked")
+		List<TValue> result = (List<TValue>) getDecorated(troveList);
+		return result;
+	}
+	
+	private static Object getDecorated(@Nonnull Object trove) {
+		if (trove == null)
+			throw new IllegalArgumentException("trove instance cannot be non-null.");
+		
+		AbstractFuzzyMatcher<Class<?>> match = FuzzyMatchers.matchSuper(trove.getClass());
+		
+		if (decorators == null) {
+			try {
+				// Attempt to get decorator class
+				decorators = TroveWrapper.class.getClassLoader().loadClass("gnu.trove.TDecorators");
+			} catch (ClassNotFoundException e) {
+				throw new IllegalStateException("Cannot find TDecorators in Gnu Trove.", e);
+			}
+		}
+		
+		// Find an appropriate wrapper method in TDecorators
+		for (Method method : decorators.getMethods()) {
+			Class<?>[] types = method.getParameterTypes();
+			
+			if (types.length == 1 && match.isMatch(types[0], null)) {
+				try {
+					Object result = method.invoke(null, trove);
+					
+					if (result == null)
+						throw new FieldAccessException("Wrapper returned NULL.");
+					else
+						return result;
+					
+				} catch (IllegalArgumentException e) {
+					throw new FieldAccessException("Cannot invoke wrapper method.", e);
+				} catch (IllegalAccessException e) {
+					throw new FieldAccessException("Illegal access.", e);
+				} catch (InvocationTargetException e) {
+					throw new FieldAccessException("Error in invocation.", e);
+				}
+			}
+		}
+		
+		throw new IllegalArgumentException("Cannot find decorator for " + trove + " (" + trove.getClass() + ")");
+	}
+}