Adding a converter for block fields.

ProtocolLib/src/main/java/com/comphenix/protocol/events/PacketContainer.java

@@ -39,6 +39,8 @@ import javax.annotation.Nullable;
 import net.minecraft.util.com.mojang.authlib.GameProfile;
 import net.minecraft.util.io.netty.buffer.ByteBuf;
 import net.minecraft.util.io.netty.buffer.UnpooledByteBufAllocator;
+
+import org.bukkit.Material;
 import org.bukkit.World;
 import org.bukkit.WorldType;
 import org.bukkit.entity.Entity;
@@ -486,6 +488,20 @@ public class PacketContainer implements Serializable {
 		);
 	}
 	
+	
+	/**
+	 * Retrieves a read/write structure for block fields.
+	 * <p>
+	 * This modifier will automatically marshall between Material and the
+	 * internal Minecraft Block.
+	 * @return A modifier for GameProfile fields.
+	 */
+	public StructureModifier<Material> getBlocks() {
+		// Convert to and from the Bukkit wrapper
+		return structureModifier.<Material>withType(
+				MinecraftReflection.getBlockClass(), BukkitConverters.getBlockConverter());
+	}
+	
 	/**
 	 * Retrieves a read/write structure for game profiles in Minecraft 1.7.2.
 	 * <p>
@@ -526,7 +542,7 @@ public class PacketContainer implements Serializable {
 	}
 	
 	/**
-	 * Retrieve a read/write structure for the Protocol enum.
+	 * Retrieve a read/write structure for the Protocol enum in 1.7.2.
 	 * @return A modifier for Protocol enum fields.
 	 */
 	public StructureModifier<Protocol> getProtocols() {
@@ -536,7 +552,7 @@ public class PacketContainer implements Serializable {
 	}
 	
 	/**
-	 * Retrieve a read/write structure for the ClientCommand enum.
+	 * Retrieve a read/write structure for the ClientCommand enum in 1.7.2.
 	 * @return A modifier for ClientCommand enum fields.
 	 */
 	public StructureModifier<ClientCommand> getClientCommands() {
@@ -546,7 +562,7 @@ public class PacketContainer implements Serializable {
 	}
 
 	/**
-	 * Retrieve a read/write structure for the ChatVisibility enum.
+	 * Retrieve a read/write structure for the ChatVisibility enum in 1.7.2.
 	 * @return A modifier for ChatVisibility enum fields.
 	 */
 	public StructureModifier<ChatVisibility> getChatVisibilities() {
@@ -556,7 +572,7 @@ public class PacketContainer implements Serializable {
 	}
 	
 	/**
-	 * Retrieve a read/write structure for the Difficulty enum.
+	 * Retrieve a read/write structure for the Difficulty enum in 1.7.2.
 	 * @return A modifier for Difficulty enum fields.
 	 */
 	public StructureModifier<Difficulty> getDifficulties() {
@@ -566,7 +582,7 @@ public class PacketContainer implements Serializable {
 	}
 	
 	/**
-	 * Retrieve a read/write structure for the EntityUse enum.
+	 * Retrieve a read/write structure for the EntityUse enum in 1.7.2.
 	 * @return A modifier for EntityUse enum fields.
 	 */
 	public StructureModifier<EntityUseAction> getEntityUseActions() {
@@ -576,7 +592,7 @@ public class PacketContainer implements Serializable {
 	}
 	
 	/**
-	 * Retrieve a read/write structure for the NativeGameMode enum.
+	 * Retrieve a read/write structure for the NativeGameMode enum in 1.7.2.
 	 * @return A modifier for NativeGameMode enum fields.
 	 */
 	public StructureModifier<NativeGameMode> getGamemodes() {

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

@@ -21,12 +21,14 @@ import java.lang.ref.WeakReference;
 import java.lang.reflect.Array;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 
+import org.bukkit.Material;
 import org.bukkit.World;
 import org.bukkit.WorldType;
 import org.bukkit.entity.Entity;
@@ -35,7 +37,6 @@ import org.bukkit.potion.PotionEffect;
 import org.bukkit.potion.PotionEffectType;
 
 import com.comphenix.protocol.PacketType;
-import com.comphenix.protocol.PacketType.Protocol;
 import com.comphenix.protocol.ProtocolLibrary;
 import com.comphenix.protocol.ProtocolManager;
 import com.comphenix.protocol.injector.PacketConstructor;
@@ -44,6 +45,9 @@ import com.comphenix.protocol.reflect.EquivalentConverter;
 import com.comphenix.protocol.reflect.FieldAccessException;
 import com.comphenix.protocol.reflect.FuzzyReflection;
 import com.comphenix.protocol.reflect.StructureModifier;
+import com.comphenix.protocol.reflect.accessors.Accessors;
+import com.comphenix.protocol.reflect.accessors.MethodAccessor;
+import com.comphenix.protocol.reflect.fuzzy.FuzzyMethodContract;
 import com.comphenix.protocol.reflect.instances.DefaultInstances;
 import com.comphenix.protocol.utility.MinecraftReflection;
 import com.comphenix.protocol.wrappers.nbt.NbtBase;
@@ -73,6 +77,10 @@ public class BukkitConverters {
 	private static Method worldTypeName;
 	private static Method worldTypeGetType;
 	
+	// Used to get block instances
+	private static MethodAccessor GET_BLOCK;
+	private static MethodAccessor GET_BLOCK_ID;
+	
 	// Used for potion effect conversion
 	private static volatile Constructor<?> mobEffectConstructor;
 	private static volatile StructureModifier<Object> mobEffectModifier;
@@ -586,7 +594,44 @@ public class BukkitConverters {
 		};
 	}
 	
+	/**
+	 * Retrieve a converter for block instances.
+	 * @return A converter for block instances.
+	 */
+	public static EquivalentConverter<Material> getBlockConverter() {
+		// Initialize if we have't already
+		if (GET_BLOCK == null || GET_BLOCK_ID == null) {
+			Class<?> block = MinecraftReflection.getBlockClass();
 			
+			FuzzyMethodContract getIdContract = FuzzyMethodContract.newBuilder().
+					parameterExactArray(block).
+					requireModifier(Modifier.STATIC).
+					build();
+			FuzzyMethodContract getBlockContract = FuzzyMethodContract.newBuilder().
+					parameterExactArray(int.class).
+					requireModifier(Modifier.STATIC).
+					build();
+			GET_BLOCK = Accessors.getMethodAccessor(FuzzyReflection.fromClass(block).getMethod(getBlockContract));
+			GET_BLOCK_ID = Accessors.getMethodAccessor(FuzzyReflection.fromClass(block).getMethod(getIdContract));
+		}
+		
+		return new IgnoreNullConverter<Material>() {
+			@Override
+			protected Object getGenericValue(Class<?> genericType, Material specific) {
+				return GET_BLOCK.invoke(null, specific.getId());
+			}
+			
+			@Override
+			protected Material getSpecificValue(Object generic) {
+				return Material.getMaterial((Integer) GET_BLOCK_ID.invoke(null, generic));
+			}
+			
+			@Override
+			public Class<Material> getSpecificType() {
+				return Material.class;
+			}
+		};
+	}
 	
 	/**
 	 * Retrieve the converter used to convert between a PotionEffect and the equivalent NMS Mobeffect.

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

@@ -6,7 +6,6 @@ import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
-import java.nio.ByteBuffer;
 import java.util.List;
 
 import javax.imageio.ImageIO;

ProtocolLib/src/test/java/com/comphenix/protocol/events/PacketContainerTest.java

@@ -379,6 +379,14 @@ public class PacketContainerTest {
 				ToStringBuilder.reflectionToString(clonedSnapshot, ToStringStyle.SHORT_PREFIX_STYLE));
 	}
 	
+	@Test
+	public void testBlocks() {
+		PacketContainer blockAction = new PacketContainer(PacketType.Play.Server.BLOCK_ACTION);
+		blockAction.getBlocks().write(0, Material.STONE);
+		
+		assertEquals(Material.STONE, blockAction.getBlocks().read(0));
+	}
+
 	@SuppressWarnings("deprecation")
 	@Test
 	public void testPotionEffect() {