firework boost, set metatype to the newer class

common/src/main/java/us/myles/ViaVersion/api/minecraft/metadata/types/MetaType1_14.java

@@ -18,14 +18,15 @@ public enum MetaType1_14 implements MetaType {
     Slot(6, Type.FLAT_VAR_INT_ITEM),
     Boolean(7, Type.BOOLEAN),
     Vector3F(8, Type.ROTATION),
-    Position(9, Type.POSITION),
+    Position(9, Type.POSITION1_14),
-    OptPosition(10, Type.OPTIONAL_POSITION),
+    OptPosition(10, Type.OPTIONAL_POSITION_1_14),
     Direction(11, Type.VAR_INT),
     OptUUID(12, Type.OPTIONAL_UUID),
     BlockID(13, Type.VAR_INT),
     NBTTag(14, Type.NBT),
     PARTICLE(15, Protocol1_13_2To1_13_1.PARTICLE_TYPE),
     VillagerData(16, Type.VILLAGER_DATA),
+    OptVarInt(17, Type.OPTIONAL_VAR_INT),
     Discontinued(99, null);
 
     private final int typeID;

common/src/main/java/us/myles/ViaVersion/api/type/Type.java

@@ -50,6 +50,7 @@ public abstract class Type<T> implements ByteBufReader<T>, ByteBufWriter<T> {
     /* Variable Types */
     public static final Type<Integer> VAR_INT = new VarIntType();
     public static final Type<Integer[]> VAR_INT_ARRAY = new ArrayType<>(Type.VAR_INT);
+    public static final Type<Integer> OPTIONAL_VAR_INT = new OptionalVarIntType();
     public static final Type<Long> VAR_LONG = new VarLongType();
     public static final Type<Long[]> VAR_LONG_ARRAY = new ArrayType<>(Type.VAR_LONG);
     /* Special Types */
@@ -65,6 +66,7 @@ public abstract class Type<T> implements ByteBufReader<T>, ByteBufWriter<T> {
     public static final Type<UUID> OPTIONAL_UUID = new OptUUIDType();
     public static final Type<String> OPTIONAL_CHAT = new OptionalChatType();
     public static final Type<Position> OPTIONAL_POSITION = new OptPositionType();
+    public static final Type<Position> OPTIONAL_POSITION_1_14 = new OptPosition1_14Type();
 
     public static final Type<Item> ITEM = new ItemType();
     public static final Type<Item[]> ITEM_ARRAY = new ItemArrayType();

common/src/main/java/us/myles/ViaVersion/api/type/types/minecraft/OptPosition1_14Type.java

@@ -0,0 +1,25 @@
+package us.myles.ViaVersion.api.type.types.minecraft;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.minecraft.Position;
+import us.myles.ViaVersion.api.type.Type;
+
+public class OptPosition1_14Type extends Type<Position> {
+    public OptPosition1_14Type() {
+        super(Position.class);
+    }
+
+    @Override
+    public Position read(ByteBuf buffer) throws Exception {
+        boolean present = buffer.readBoolean();
+        if (!present) return null;
+        return Type.POSITION1_14.read(buffer);
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Position object) throws Exception {
+        buffer.writeBoolean(object != null);
+        if (object != null)
+            Type.POSITION1_14.write(buffer, object);
+    }
+}

common/src/main/java/us/myles/ViaVersion/api/type/types/minecraft/OptionalVarIntType.java

@@ -0,0 +1,23 @@
+package us.myles.ViaVersion.api.type.types.minecraft;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+
+public class OptionalVarIntType extends Type<Integer> {
+    public OptionalVarIntType() {
+        super(Integer.class);
+    }
+
+    @Override
+    public Integer read(ByteBuf buffer) throws Exception {
+        int read = Type.VAR_INT.read(buffer);
+        if (read == 0) return null;
+        return read - 1;
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Integer object) throws Exception {
+        if (object == null) Type.VAR_INT.write(buffer, 0);
+        else Type.VAR_INT.write(buffer, object + 1);
+    }
+}

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13_2to1_13_1/packets/EntityPackets.java

@@ -2,7 +2,6 @@ package us.myles.ViaVersion.protocols.protocol1_13_2to1_13_1.packets;
 
 import us.myles.ViaVersion.api.PacketWrapper;
 import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
-import us.myles.ViaVersion.api.minecraft.metadata.types.MetaType1_13;
 import us.myles.ViaVersion.api.minecraft.metadata.types.MetaType1_13_2;
 import us.myles.ViaVersion.api.protocol.Protocol;
 import us.myles.ViaVersion.api.remapper.PacketHandler;
@@ -15,6 +14,15 @@ import us.myles.ViaVersion.packets.State;
 public class EntityPackets {
 
     public static void register(Protocol protocol) {
+        final PacketHandler metaTypeHandler = new PacketHandler() {
+            @Override
+            public void handle(PacketWrapper wrapper) throws Exception {
+                for (Metadata metadata : wrapper.get(Types1_13_2.METADATA_LIST, 0)) {
+                    metadata.setMetaType(MetaType1_13_2.byId(metadata.getMetaType().getTypeID()));
+                }
+            }
+        };
+
         // Spawn mob packet
         protocol.registerOutgoing(State.PLAY, 0x3, 0x3, new PacketRemapper() {
             @Override
@@ -33,16 +41,7 @@ public class EntityPackets {
                 map(Type.SHORT); // 11 - Velocity Z
                 map(Types1_13.METADATA_LIST, Types1_13_2.METADATA_LIST); // 12 - Metadata
 
-                handler(new PacketHandler() {
+                handler(metaTypeHandler);
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        for (Metadata metadata : wrapper.get(Types1_13_2.METADATA_LIST, 0)) {
-                            if (metadata.getMetaType() == MetaType1_13.Slot) {
-                                metadata.setMetaType(MetaType1_13_2.Slot);
-                            }
-                        }
-                    }
-                });
             }
         });
 
@@ -59,16 +58,7 @@ public class EntityPackets {
                 map(Type.BYTE); // 6 - Pitch
                 map(Types1_13.METADATA_LIST, Types1_13_2.METADATA_LIST); // 7 - Metadata
 
-                handler(new PacketHandler() {
+                handler(metaTypeHandler);
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        for (Metadata metadata : wrapper.get(Types1_13_2.METADATA_LIST, 0)) {
-                            if (metadata.getMetaType() == MetaType1_13.Slot) {
-                                metadata.setMetaType(MetaType1_13_2.Slot);
-                            }
-                        }
-                    }
-                });
             }
         });
 
@@ -80,16 +70,7 @@ public class EntityPackets {
                 map(Type.VAR_INT); // 0 - Entity ID
                 map(Types1_13.METADATA_LIST, Types1_13_2.METADATA_LIST); // 1 - Metadata list
 
-                handler(new PacketHandler() {
+                handler(metaTypeHandler);
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        for (Metadata metadata : wrapper.get(Types1_13_2.METADATA_LIST, 0)) {
-                            if (metadata.getMetaType() == MetaType1_13.Slot) {
-                                metadata.setMetaType(MetaType1_13_2.Slot);
-                            }
-                        }
-                    }
-                });
             }
         });
     }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/MetadataRewriter.java

@@ -20,8 +20,11 @@ public class MetadataRewriter {
         for (Metadata metadata : new ArrayList<>(metadatas)) {
             try {
                 // Handle new MetaTypes
-                if (metadata.getMetaType().getTypeID() > 4)
+                if (metadata.getMetaType().getTypeID() > 4) {
                     metadata.setMetaType(MetaType1_13.byId(metadata.getMetaType().getTypeID() + 1));
+                } else {
+                    metadata.setMetaType(MetaType1_13.byId(metadata.getMetaType().getTypeID()));
+                }
 
                 // Handle String -> Chat DisplayName
                 if (metadata.getId() == 2) {

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_14to1_13_2/MetadataRewriter.java

@@ -6,7 +6,6 @@ import us.myles.ViaVersion.api.entities.Entity1_14Types;
 import us.myles.ViaVersion.api.minecraft.VillagerData;
 import us.myles.ViaVersion.api.minecraft.item.Item;
 import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
-import us.myles.ViaVersion.api.minecraft.metadata.types.MetaType1_13_2;
 import us.myles.ViaVersion.api.minecraft.metadata.types.MetaType1_14;
 import us.myles.ViaVersion.protocols.protocol1_14to1_13_2.packets.InventoryPackets;
 import us.myles.ViaVersion.protocols.protocol1_14to1_13_2.storage.EntityTracker;
@@ -19,11 +18,13 @@ public class MetadataRewriter {
     public static void handleMetadata(int entityId, Entity1_14Types.EntityType type, List<Metadata> metadatas, UserConnection connection) {
         for (Metadata metadata : new ArrayList<>(metadatas)) {
             try {
+                metadata.setMetaType(MetaType1_14.byId(metadata.getMetaType().getTypeID()));
+
                 EntityTracker tracker = connection.get(EntityTracker.class);
                 // 1.13 changed item to flat item (no data)
-                if (metadata.getMetaType() == MetaType1_13_2.Slot) {
+                if (metadata.getMetaType() == MetaType1_14.Slot) {
                     InventoryPackets.toClient((Item) metadata.getValue());
-                } else if (metadata.getMetaType() == MetaType1_13_2.BlockID) {
+                } else if (metadata.getMetaType() == MetaType1_14.BlockID) {
                     // Convert to new block id
                     int data = (int) metadata.getValue();
                     metadata.setValue(Protocol1_14To1_13_2.getNewBlockStateId(data));
@@ -59,8 +60,8 @@ public class MetadataRewriter {
 
                 if (type.is(Entity1_14Types.EntityType.FIREWORKS_ROCKET)) {
                     if (metadata.getId() == 7) {
-                        metadata.setValue(tracker.getUUID(((Number) metadata.getValue()).intValue()).orNull());
+                        if (metadata.getValue().equals(0)) metadata.setValue(null); // https://bugs.mojang.com/browse/MC-111480
-                        metadata.setMetaType(MetaType1_14.OptUUID);
+                        metadata.setMetaType(MetaType1_14.OptVarInt);
                     }
                 }
             } catch (Exception e) {