Various API changes to LegacyBlockItemRewriter (#703)

common/src/main/java/com/viaversion/viabackwards/api/rewriters/BackwardsStructuredItemRewriter.java

@@ -67,7 +67,7 @@ public class BackwardsStructuredItemRewriter<C extends ClientboundPacketType, S
 
         // Save original id, set remapped id
         final CompoundTag tag = createCustomTag(item);
-        tag.putInt(nbtTagName + "|id", item.identifier());
+        tag.putInt(getNbtTagName() + "|id", item.identifier());
         item.setIdentifier(mappedItem.getId());
 
         // Add custom model data
@@ -95,7 +95,7 @@ public class BackwardsStructuredItemRewriter<C extends ClientboundPacketType, S
 
         final CompoundTag tag = customTag(item);
         if (tag != null) {
-            final Tag originalId = tag.remove(nbtTagName + "|id");
+            final Tag originalId = tag.remove(getNbtTagName() + "|id");
             if (originalId instanceof IntTag) {
                 item.setIdentifier(((NumberTag) originalId).asInt());
             }

common/src/main/java/com/viaversion/viabackwards/api/rewriters/ItemRewriter.java

@@ -91,7 +91,7 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
         }
 
         // Save original id, set remapped id
-        item.tag().putInt(nbtTagName + "|id", item.identifier());
+        item.tag().putInt(getNbtTagName() + "|id", item.identifier());
         item.setIdentifier(data.getId());
 
         // Add custom model data
@@ -105,7 +105,7 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
         }
         if (!display.contains("Name")) {
             display.put("Name", new StringTag(data.getJsonName()));
-            display.put(nbtTagName + "|customName", new ByteTag());
+            display.put(getNbtTagName() + "|customName", new ByteTag());
         }
         return item;
     }
@@ -116,7 +116,7 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
 
         super.handleItemToServer(item);
         if (item.tag() != null) {
-            Tag originalId = item.tag().remove(nbtTagName + "|id");
+            Tag originalId = item.tag().remove(getNbtTagName() + "|id");
             if (originalId instanceof IntTag) {
                 item.setIdentifier(((NumberTag) originalId).asInt());
             }

common/src/main/java/com/viaversion/viabackwards/api/rewriters/ItemRewriterBase.java

@@ -32,13 +32,13 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 public abstract class ItemRewriterBase<C extends ClientboundPacketType, S extends ServerboundPacketType,
     T extends BackwardsProtocol<C, ?, ?, S>> extends ItemRewriter<C, S, T> {
 
-    protected final String nbtTagName;
     protected final boolean jsonNameFormat;
+    protected final String protocolName;
 
     protected ItemRewriterBase(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType, Type<Item> mappedItemType, Type<Item[]> mappedItemArrayType, boolean jsonFormat) {
         super(protocol, itemType, itemArrayType, mappedItemType, mappedItemArrayType);
         this.jsonNameFormat = jsonFormat;
-        nbtTagName = "VB|" + protocol.getClass().getSimpleName();
+        protocolName = protocol.getClass().getSimpleName();
     }
 
     protected ItemRewriterBase(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType, boolean jsonNameFormat) {
@@ -55,12 +55,12 @@ public abstract class ItemRewriterBase<C extends ClientboundPacketType, S extend
     }
 
     protected boolean hasBackupTag(CompoundTag displayTag, String tagName) {
-        return displayTag.contains(nbtTagName + "|o" + tagName);
+        return displayTag.contains(getNbtTagName() + "|o" + tagName);
     }
 
     protected void saveStringTag(CompoundTag displayTag, StringTag original, String name) {
         // Multiple places might try to backup data
-        String backupName = nbtTagName + "|o" + name;
+        String backupName = getNbtTagName() + "|o" + name;
         if (!displayTag.contains(backupName)) {
             displayTag.putString(backupName, original.getValue());
         }
@@ -68,7 +68,7 @@ public abstract class ItemRewriterBase<C extends ClientboundPacketType, S extend
 
     protected void saveListTag(CompoundTag displayTag, ListTag<?> original, String name) {
         // Multiple places might try to backup data
-        String backupName = nbtTagName + "|o" + name;
+        String backupName = getNbtTagName() + "|o" + name;
         if (!displayTag.contains(backupName)) {
             displayTag.put(backupName, original.copy());
         }
@@ -80,7 +80,7 @@ public abstract class ItemRewriterBase<C extends ClientboundPacketType, S extend
         CompoundTag display = item.tag().getCompoundTag("display");
         if (display != null) {
             // Remove custom name / restore original name
-            if (display.remove(nbtTagName + "|customName") != null) {
+            if (display.remove(getNbtTagName() + "|customName") != null) {
                 display.remove("Name");
             } else {
                 restoreStringTag(display, "Name");
@@ -92,20 +92,20 @@ public abstract class ItemRewriterBase<C extends ClientboundPacketType, S extend
     }
 
     protected void restoreStringTag(CompoundTag tag, String tagName) {
-        Tag original = tag.remove(nbtTagName + "|o" + tagName);
+        Tag original = tag.remove(getNbtTagName() + "|o" + tagName);
         if (original instanceof StringTag) {
             tag.putString(tagName, ((StringTag) original).getValue());
         }
     }
 
     protected void restoreListTag(CompoundTag tag, String tagName) {
-        Tag original = tag.remove(nbtTagName + "|o" + tagName);
+        Tag original = tag.remove(getNbtTagName() + "|o" + tagName);
         if (original instanceof ListTag) {
             tag.put(tagName, ((ListTag<?>) original).copy());
         }
     }
 
     public String getNbtTagName() {
-        return nbtTagName;
+        return "VB|" + protocolName;
     }
 }

common/src/main/java/com/viaversion/viabackwards/api/rewriters/LegacyBlockItemRewriter.java

@@ -23,13 +23,17 @@ import com.viaversion.viabackwards.api.data.MappedLegacyBlockItem;
 import com.viaversion.viabackwards.api.data.BackwardsMappingDataLoader;
 import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data.BlockColors;
 import com.viaversion.viabackwards.utils.Block;
+import com.viaversion.viaversion.api.minecraft.BlockChangeRecord;
 import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
 import com.viaversion.viaversion.api.minecraft.chunks.ChunkSection;
 import com.viaversion.viaversion.api.minecraft.chunks.DataPalette;
 import com.viaversion.viaversion.api.minecraft.chunks.PaletteType;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_12;
 import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
 import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectMap;
 import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectOpenHashMap;
@@ -43,26 +47,27 @@ import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
 import com.viaversion.viaversion.util.ComponentUtil;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Optional;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public abstract class LegacyBlockItemRewriter<C extends ClientboundPacketType, S extends ServerboundPacketType,
     T extends BackwardsProtocol<C, ?, ?, S>> extends ItemRewriterBase<C, S, T> {
 
-    private static final Map<String, Int2ObjectMap<MappedLegacyBlockItem>> LEGACY_MAPPINGS = new HashMap<>();
+    protected final Int2ObjectMap<MappedLegacyBlockItem> replacementData = new Int2ObjectOpenHashMap<>(8); // Raw id -> mapped data
-    protected final Int2ObjectMap<MappedLegacyBlockItem> replacementData; // Raw id -> mapped data
 
-    static {
+    protected LegacyBlockItemRewriter(T protocol, String name) {
-        JsonObject jsonObject = BackwardsMappingDataLoader.INSTANCE.loadFromDataDir("legacy-mappings.json");
+        super(protocol, Type.ITEM1_8, Type.ITEM1_8_SHORT_ARRAY, false);
-        for (Map.Entry<String, JsonElement> entry : jsonObject.entrySet()) {
+        final JsonObject jsonObject = readMappingsFile("item-mappings-" + name + ".json");
-            Int2ObjectMap<MappedLegacyBlockItem> mappings = new Int2ObjectOpenHashMap<>(8);
+        for (Map.Entry<String, JsonElement> dataEntry : jsonObject.entrySet()) {
-            LEGACY_MAPPINGS.put(entry.getKey(), mappings);
+            addMapping(dataEntry.getKey(), dataEntry.getValue().getAsJsonObject(), replacementData);
-            for (Map.Entry<String, JsonElement> dataEntry : entry.getValue().getAsJsonObject().entrySet()) {
-                addMapping(dataEntry.getKey(), dataEntry.getValue().getAsJsonObject(), mappings);
-            }
         }
     }
 
-    private static void addMapping(String key, JsonObject object, Int2ObjectMap<MappedLegacyBlockItem> mappings) {
+    protected JsonObject readMappingsFile(final String name) {
+        return BackwardsMappingDataLoader.INSTANCE.loadFromDataDir(name);
+    }
+
+    private void addMapping(String key, JsonObject object, Int2ObjectMap<MappedLegacyBlockItem> mappings) {
         int id = object.getAsJsonPrimitive("id").getAsInt();
         JsonPrimitive jsonData = object.getAsJsonPrimitive("data");
         short data = jsonData != null ? jsonData.getAsShort() : 0;
@@ -104,9 +109,36 @@ public abstract class LegacyBlockItemRewriter<C extends ClientboundPacketType, S
         }
     }
 
-    protected LegacyBlockItemRewriter(T protocol) {
+    public void registerBlockChange(C packetType) {
-        super(protocol, Type.ITEM1_8, Type.ITEM1_8_SHORT_ARRAY, false);
+        protocol.registerClientbound(packetType, new PacketHandlers() {
-        replacementData = LEGACY_MAPPINGS.get(protocol.getClass().getSimpleName().split("To")[1].replace("_", "."));
+            @Override
+            public void register() {
+                map(Type.POSITION1_8); // 0 - Block Position
+                map(Type.VAR_INT); // 1 - Block
+
+                handler(wrapper -> {
+                    int idx = wrapper.get(Type.VAR_INT, 0);
+                    wrapper.set(Type.VAR_INT, 0, handleBlockID(idx));
+                });
+            }
+        });
+    }
+
+    public void registerMultiBlockChange(C packetType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.INT); // 0 - Chunk X
+                map(Type.INT); // 1 - Chunk Z
+                map(Type.BLOCK_CHANGE_RECORD_ARRAY);
+
+                handler(wrapper -> {
+                    for (BlockChangeRecord record : wrapper.get(Type.BLOCK_CHANGE_RECORD_ARRAY, 0)) {
+                        record.setBlockId(handleBlockID(record.getBlockId()));
+                    }
+                });
+            }
+        });
     }
 
     @Override
@@ -141,7 +173,7 @@ public abstract class LegacyBlockItemRewriter<C extends ClientboundPacketType, S
             if (nameTag == null) {
                 nameTag = new StringTag(data.getName());
                 display.put("Name", nameTag);
-                display.put(nbtTagName + "|customName", new ByteTag());
+                display.put(getNbtTagName() + "|customName", new ByteTag());
             }
 
             // Handle colors
@@ -163,6 +195,20 @@ public abstract class LegacyBlockItemRewriter<C extends ClientboundPacketType, S
         return (b.getId() << 4 | (b.getData() & 15));
     }
 
+    public PacketHandler getFallingBlockHandler() {
+        return wrapper -> {
+            final Optional<EntityTypes1_12.ObjectType> type = EntityTypes1_12.ObjectType.findById(wrapper.get(Type.BYTE, 0));
+            if (type.isPresent() && type.get() == EntityTypes1_12.ObjectType.FALLING_BLOCK) {
+                final int objectData = wrapper.get(Type.INT, 0);
+
+                final Block block = handleBlock(objectData & 4095, objectData >> 12 & 15);
+                if (block == null) return;
+
+                wrapper.set(Type.INT, 0, block.getId() | block.getData() << 12);
+            }
+        };
+    }
+
     public @Nullable Block handleBlock(int blockId, int data) {
         MappedLegacyBlockItem settings = getMappedBlockItem(blockId, data);
         if (settings == null || !settings.isBlock()) return null;

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_10to1_11/packets/BlockItemPackets1_11.java

@@ -49,11 +49,14 @@ public class BlockItemPackets1_11 extends LegacyBlockItemRewriter<ClientboundPac
     private LegacyEnchantmentRewriter enchantmentRewriter;
 
     public BlockItemPackets1_11(Protocol1_10To1_11 protocol) {
-        super(protocol);
+        super(protocol, "1.11");
     }
 
     @Override
     protected void registerPackets() {
+        registerBlockChange(ClientboundPackets1_9_3.BLOCK_CHANGE);
+        registerMultiBlockChange(ClientboundPackets1_9_3.MULTI_BLOCK_CHANGE);
+
         protocol.registerClientbound(ClientboundPackets1_9_3.SET_SLOT, new PacketHandlers() {
             @Override
             public void register() {
@@ -187,34 +190,6 @@ public class BlockItemPackets1_11 extends LegacyBlockItemRewriter<ClientboundPac
             }
         });
 
-        protocol.registerClientbound(ClientboundPackets1_9_3.BLOCK_CHANGE, new PacketHandlers() {
-            @Override
-            public void register() {
-                map(Type.POSITION1_8); // 0 - Block Position
-                map(Type.VAR_INT); // 1 - Block
-
-                handler(wrapper -> {
-                    int idx = wrapper.get(Type.VAR_INT, 0);
-                    wrapper.set(Type.VAR_INT, 0, handleBlockID(idx));
-                });
-            }
-        });
-
-        protocol.registerClientbound(ClientboundPackets1_9_3.MULTI_BLOCK_CHANGE, new PacketHandlers() {
-            @Override
-            public void register() {
-                map(Type.INT); // 0 - Chunk X
-                map(Type.INT); // 1 - Chunk Z
-                map(Type.BLOCK_CHANGE_RECORD_ARRAY);
-
-                handler(wrapper -> {
-                    for (BlockChangeRecord record : wrapper.get(Type.BLOCK_CHANGE_RECORD_ARRAY, 0)) {
-                        record.setBlockId(handleBlockID(record.getBlockId()));
-                    }
-                });
-            }
-        });
-
         protocol.registerClientbound(ClientboundPackets1_9_3.BLOCK_ENTITY_DATA, new PacketHandlers() {
             @Override
             public void register() {
@@ -305,7 +280,7 @@ public class BlockItemPackets1_11 extends LegacyBlockItemRewriter<ClientboundPac
             return tag;
         });
 
-        enchantmentRewriter = new LegacyEnchantmentRewriter(nbtTagName);
+        enchantmentRewriter = new LegacyEnchantmentRewriter(getNbtTagName());
         enchantmentRewriter.registerEnchantment(71, "§cCurse of Vanishing");
         enchantmentRewriter.registerEnchantment(10, "§cCurse of Binding");
 
@@ -343,10 +318,10 @@ public class BlockItemPackets1_11 extends LegacyBlockItemRewriter<ClientboundPac
         // Rewrite spawn eggs (id checks are done in the method itself)
         EntityIdRewriter.toServerItem(item, true);
 
-        if (tag.getListTag(nbtTagName + "|ench") != null) {
+        if (tag.getListTag(getNbtTagName() + "|ench") != null) {
             enchantmentRewriter.rewriteEnchantmentsToServer(tag, false);
         }
-        if (tag.getListTag(nbtTagName + "|StoredEnchantments") != null) {
+        if (tag.getListTag(getNbtTagName() + "|StoredEnchantments") != null) {
             enchantmentRewriter.rewriteEnchantmentsToServer(tag, true);
         }
         return item;

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_10to1_11/packets/EntityPackets1_11.java

@@ -24,11 +24,9 @@ import com.viaversion.viabackwards.api.rewriters.LegacyEntityRewriter;
 import com.viaversion.viabackwards.protocol.protocol1_10to1_11.PotionSplashHandler;
 import com.viaversion.viabackwards.protocol.protocol1_10to1_11.Protocol1_10To1_11;
 import com.viaversion.viabackwards.protocol.protocol1_10to1_11.storage.ChestedHorseStorage;
-import com.viaversion.viabackwards.utils.Block;
 import com.viaversion.viaversion.api.data.entity.StoredEntityData;
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
-import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_12;
 import com.viaversion.viaversion.api.minecraft.metadata.Metadata;
 import com.viaversion.viaversion.api.minecraft.metadata.types.MetaType1_9;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
@@ -36,7 +34,6 @@ import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.types.version.Types1_9;
 import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
 import java.util.List;
-import java.util.Optional;
 
 public class EntityPackets1_11 extends LegacyEntityRewriter<ClientboundPackets1_9_3, Protocol1_10To1_11> {
 
@@ -86,21 +83,7 @@ public class EntityPackets1_11 extends LegacyEntityRewriter<ClientboundPackets1_
                 handler(getObjectTrackerHandler());
                 handler(getObjectRewriter(id -> EntityTypes1_11.ObjectType.findById(id).orElse(null)));
 
-                // Handle FallingBlock blocks
+                handler(protocol.getItemRewriter().getFallingBlockHandler());
-                handler(wrapper -> {
-                    Optional<EntityTypes1_12.ObjectType> type = EntityTypes1_12.ObjectType.findById(wrapper.get(Type.BYTE, 0));
-                    if (type.isPresent() && type.get() == EntityTypes1_12.ObjectType.FALLING_BLOCK) {
-                        int objectData = wrapper.get(Type.INT, 0);
-                        int objType = objectData & 4095;
-                        int data = objectData >> 12 & 15;
-
-                        Block block = protocol.getItemRewriter().handleBlock(objType, data);
-                        if (block == null)
-                            return;
-
-                        wrapper.set(Type.INT, 0, block.getId() | block.getData() << 12);
-                    }
-                });
             }
         });
 

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11_1to1_12/packets/BlockItemPackets1_12.java

@@ -43,11 +43,14 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 public class BlockItemPackets1_12 extends LegacyBlockItemRewriter<ClientboundPackets1_12, ServerboundPackets1_9_3, Protocol1_11_1To1_12> {
 
     public BlockItemPackets1_12(Protocol1_11_1To1_12 protocol) {
-        super(protocol);
+        super(protocol, "1.12");
     }
 
     @Override
     protected void registerPackets() {
+        registerBlockChange(ClientboundPackets1_12.BLOCK_CHANGE);
+        registerMultiBlockChange(ClientboundPackets1_12.MULTI_BLOCK_CHANGE);
+
         protocol.registerClientbound(ClientboundPackets1_12.MAP_DATA, new PacketHandlers() {
             @Override
             public void register() {
@@ -159,34 +162,6 @@ public class BlockItemPackets1_12 extends LegacyBlockItemRewriter<ClientboundPac
             handleChunk(chunk);
         });
 
-        protocol.registerClientbound(ClientboundPackets1_12.BLOCK_CHANGE, new PacketHandlers() {
-            @Override
-            public void register() {
-                map(Type.POSITION1_8); // 0 - Block Position
-                map(Type.VAR_INT); // 1 - Block
-
-                handler(wrapper -> {
-                    int idx = wrapper.get(Type.VAR_INT, 0);
-                    wrapper.set(Type.VAR_INT, 0, handleBlockID(idx));
-                });
-            }
-        });
-
-        protocol.registerClientbound(ClientboundPackets1_12.MULTI_BLOCK_CHANGE, new PacketHandlers() {
-            @Override
-            public void register() {
-                map(Type.INT); // 0 - Chunk X
-                map(Type.INT); // 1 - Chunk Z
-                map(Type.BLOCK_CHANGE_RECORD_ARRAY);
-
-                handler(wrapper -> {
-                    for (BlockChangeRecord record : wrapper.get(Type.BLOCK_CHANGE_RECORD_ARRAY, 0)) {
-                        record.setBlockId(handleBlockID(record.getBlockId()));
-                    }
-                });
-            }
-        });
-
         protocol.registerClientbound(ClientboundPackets1_12.BLOCK_ENTITY_DATA, new PacketHandlers() {
             @Override
             public void register() {

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11_1to1_12/packets/EntityPackets1_12.java

@@ -22,7 +22,6 @@ import com.viaversion.viabackwards.api.rewriters.LegacyEntityRewriter;
 import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.Protocol1_11_1To1_12;
 import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data.ParrotStorage;
 import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data.ShoulderTracker;
-import com.viaversion.viabackwards.utils.Block;
 import com.viaversion.viaversion.api.data.entity.StoredEntityData;
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_12;
@@ -36,7 +35,6 @@ import com.viaversion.viaversion.libs.gson.JsonElement;
 import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
 import com.viaversion.viaversion.protocols.protocol1_12to1_11_1.ClientboundPackets1_12;
 import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
-import java.util.Optional;
 
 public class EntityPackets1_12 extends LegacyEntityRewriter<ClientboundPackets1_12, Protocol1_11_1To1_12> {
 
@@ -63,22 +61,7 @@ public class EntityPackets1_12 extends LegacyEntityRewriter<ClientboundPackets1_
                 handler(getObjectTrackerHandler());
                 handler(getObjectRewriter(id -> EntityTypes1_12.ObjectType.findById(id).orElse(null)));
 
-                // Handle FallingBlock blocks
+                handler(protocol.getItemRewriter().getFallingBlockHandler());
-                handler(wrapper -> {
-                    Optional<EntityTypes1_12.ObjectType> type = EntityTypes1_12.ObjectType.findById(wrapper.get(Type.BYTE, 0));
-                    if (type.isPresent() && type.get() == EntityTypes1_12.ObjectType.FALLING_BLOCK) {
-                        int objectData = wrapper.get(Type.INT, 0);
-                        int objType = objectData & 4095;
-                        int data = objectData >> 12 & 15;
-
-                        Block block = protocol.getItemRewriter().handleBlock(objType, data);
-                        if (block == null) {
-                            return;
-                        }
-
-                        wrapper.set(Type.INT, 0, block.getId() | block.getData() << 12);
-                    }
-                });
             }
         });
 

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11to1_11_1/packets/ItemPackets1_11_1.java

@@ -33,7 +33,7 @@ public class ItemPackets1_11_1 extends LegacyBlockItemRewriter<ClientboundPacket
     private LegacyEnchantmentRewriter enchantmentRewriter;
 
     public ItemPackets1_11_1(Protocol1_11To1_11_1 protocol) {
-        super(protocol);
+        super(protocol, "1.11.1");
     }
 
     @Override
@@ -84,7 +84,7 @@ public class ItemPackets1_11_1 extends LegacyBlockItemRewriter<ClientboundPacket
 
     @Override
     protected void registerRewrites() {
-        enchantmentRewriter = new LegacyEnchantmentRewriter(nbtTagName);
+        enchantmentRewriter = new LegacyEnchantmentRewriter(getNbtTagName());
         enchantmentRewriter.registerEnchantment(22, "§7Sweeping Edge");
     }
 
@@ -113,10 +113,10 @@ public class ItemPackets1_11_1 extends LegacyBlockItemRewriter<ClientboundPacket
         CompoundTag tag = item.tag();
         if (tag == null) return item;
 
-        if (tag.getListTag(nbtTagName + "|ench") != null) {
+        if (tag.getListTag(getNbtTagName() + "|ench") != null) {
             enchantmentRewriter.rewriteEnchantmentsToServer(tag, false);
         }
-        if (tag.getListTag(nbtTagName + "|StoredEnchantments") != null) {
+        if (tag.getListTag(getNbtTagName() + "|StoredEnchantments") != null) {
             enchantmentRewriter.rewriteEnchantmentsToServer(tag, true);
         }
         return item;

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/packets/BlockItemPackets1_13.java

@@ -71,7 +71,7 @@ public class BlockItemPackets1_13 extends com.viaversion.viabackwards.api.rewrit
 
     public BlockItemPackets1_13(Protocol1_12_2To1_13 protocol) {
         super(protocol, null, null);
-        extraNbtTag = "VB|" + protocol.getClass().getSimpleName() + "|2";
+        extraNbtTag = getNbtTagName() + "|2";
     }
 
     public static boolean isDamageable(int id) {

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_19_4to1_20/packets/BlockItemPackets1_20.java

@@ -166,7 +166,7 @@ public final class BlockItemPackets1_20 extends ItemRewriter<ClientboundPackets1
                 final String pattern = Key.stripMinecraftNamespace(patternTag.getValue());
                 if (NEW_TRIM_PATTERNS.contains(pattern)) {
                     tag.remove("Trim");
-                    tag.put(nbtTagName + "|Trim", trimTag);
+                    tag.put(getNbtTagName() + "|Trim", trimTag);
                 }
             }
         }
@@ -184,7 +184,7 @@ public final class BlockItemPackets1_20 extends ItemRewriter<ClientboundPackets1
         // Add back original trim tag
         final Tag trimTag;
         final CompoundTag tag = item.tag();
-        if (tag != null && (trimTag = tag.remove(nbtTagName + "|Trim")) != null) {
+        if (tag != null && (trimTag = tag.remove(getNbtTagName() + "|Trim")) != null) {
             tag.put("Trim", trimTag);
         }
         return item;

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_9_4to1_10/packets/BlockItemPackets1_10.java

@@ -33,11 +33,14 @@ import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ServerboundPac
 public class BlockItemPackets1_10 extends LegacyBlockItemRewriter<ClientboundPackets1_9_3, ServerboundPackets1_9_3, Protocol1_9_4To1_10> {
 
     public BlockItemPackets1_10(Protocol1_9_4To1_10 protocol) {
-        super(protocol);
+        super(protocol, "1.10");
     }
 
     @Override
     protected void registerPackets() {
+        registerBlockChange(ClientboundPackets1_9_3.BLOCK_CHANGE);
+        registerMultiBlockChange(ClientboundPackets1_9_3.MULTI_BLOCK_CHANGE);
+
         registerSetSlot(ClientboundPackets1_9_3.SET_SLOT);
         registerWindowItems(ClientboundPackets1_9_3.WINDOW_ITEMS);
 
@@ -83,36 +86,6 @@ public class BlockItemPackets1_10 extends LegacyBlockItemRewriter<ClientboundPac
             handleChunk(chunk);
         });
 
-        // Block Change Packet
-        protocol.registerClientbound(ClientboundPackets1_9_3.BLOCK_CHANGE, new PacketHandlers() {
-            @Override
-            public void register() {
-                map(Type.POSITION1_8); // 0 - Block Position
-                map(Type.VAR_INT); // 1 - Block
-
-                handler(wrapper -> {
-                    int idx = wrapper.get(Type.VAR_INT, 0);
-                    wrapper.set(Type.VAR_INT, 0, handleBlockID(idx));
-                });
-            }
-        });
-
-        // Multi Block Change Packet
-        protocol.registerClientbound(ClientboundPackets1_9_3.MULTI_BLOCK_CHANGE, new PacketHandlers() {
-            @Override
-            public void register() {
-                map(Type.INT); // 0 - Chunk X
-                map(Type.INT); // 1 - Chunk Z
-                map(Type.BLOCK_CHANGE_RECORD_ARRAY);
-
-                handler(wrapper -> {
-                    for (BlockChangeRecord record : wrapper.get(Type.BLOCK_CHANGE_RECORD_ARRAY, 0)) {
-                        record.setBlockId(handleBlockID(record.getBlockId()));
-                    }
-                });
-            }
-        });
-
         // Rewrite metadata items
         protocol.getEntityRewriter().filter().handler((event, meta) -> {
             if (meta.metaType().type().equals(Type.ITEM1_8)) // Is Item

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_9_4to1_10/packets/EntityPackets1_10.java

@@ -22,11 +22,9 @@ import com.viaversion.viabackwards.api.entities.storage.EntityData;
 import com.viaversion.viabackwards.api.entities.storage.WrappedMetadata;
 import com.viaversion.viabackwards.api.rewriters.LegacyEntityRewriter;
 import com.viaversion.viabackwards.protocol.protocol1_9_4to1_10.Protocol1_9_4To1_10;
-import com.viaversion.viabackwards.utils.Block;
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_10;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
-import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_12;
 import com.viaversion.viaversion.api.minecraft.metadata.Metadata;
 import com.viaversion.viaversion.api.minecraft.metadata.types.MetaType1_9;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
@@ -34,7 +32,6 @@ import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.types.version.Types1_9;
 import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
 import java.util.List;
-import java.util.Optional;
 
 public class EntityPackets1_10 extends LegacyEntityRewriter<ClientboundPackets1_9_3, Protocol1_9_4To1_10> {
 
@@ -61,21 +58,7 @@ public class EntityPackets1_10 extends LegacyEntityRewriter<ClientboundPackets1_
                 handler(getObjectTrackerHandler());
                 handler(getObjectRewriter(id -> EntityTypes1_11.ObjectType.findById(id).orElse(null)));
 
-                // Handle FallingBlock blocks
+                handler(protocol.getItemRewriter().getFallingBlockHandler());
-                handler(wrapper -> {
-                    Optional<EntityTypes1_12.ObjectType> type = EntityTypes1_12.ObjectType.findById(wrapper.get(Type.BYTE, 0));
-                    if (type.isPresent() && type.get() == EntityTypes1_12.ObjectType.FALLING_BLOCK) {
-                        int objectData = wrapper.get(Type.INT, 0);
-                        int objType = objectData & 4095;
-                        int data = objectData >> 12 & 15;
-
-                        Block block = protocol.getItemRewriter().handleBlock(objType, data);
-                        if (block == null)
-                            return;
-
-                        wrapper.set(Type.INT, 0, block.getId() | block.getData() << 12);
-                    }
-                });
             }
         });
 

common/src/main/resources/assets/viabackwards/data/item-mappings-1.10.json

@@ -0,0 +1,33 @@
+{
+  "255": {
+    "id": 217,
+    "name": "1.10 Structure Block"
+  },
+  "217": {
+    "id": 287,
+    "name": "1.10 Structure Void",
+    "block": true
+  },
+  "213": {
+    "id": 159,
+    "data": 1,
+    "name": "1.10 Magma Block",
+    "block": true
+  },
+  "214": {
+    "id": 159,
+    "data": 14,
+    "name": "1.10 Nether Wart Block",
+    "block": true
+  },
+  "215": {
+    "id": 112,
+    "name": "1.10 Red Nether Bricks",
+    "block": true
+  },
+  "216": {
+    "id": 155,
+    "name": "1.10 Bone Block",
+    "block": true
+  }
+}

common/src/main/resources/assets/viabackwards/data/item-mappings-1.11.1.json

@@ -0,0 +1,6 @@
+{
+  "452": {
+    "id": 265,
+    "name": "1.11.1 Iron Nugget"
+  }
+}

common/src/main/resources/assets/viabackwards/data/item-mappings-1.11.json

@@ -0,0 +1,21 @@
+{
+  "218": {
+    "id": 23,
+    "data": -1,
+    "name": "1.11 Observer",
+    "block": true
+  },
+  "449": {
+    "id": 418,
+    "name": "1.11 Totem of Undying"
+  },
+  "450": {
+    "id": 433,
+    "name": "1.11 Shulker Shell"
+  },
+  "219-234": {
+    "id": 158,
+    "name": "1.11 %color% Shulker Box",
+    "block": true
+  }
+}

common/src/main/resources/assets/viabackwards/data/item-mappings-1.12.json

@@ -0,0 +1,27 @@
+{
+  "251": {
+    "id": 159,
+    "data": -1,
+    "name": "1.12 %vb_color% Concrete",
+    "block": true
+  },
+  "252": {
+    "id": 35,
+    "data": -1,
+    "name": "1.12 %vb_color% Concrete Powder",
+    "block": true
+  },
+  "453": {
+    "id": 340,
+    "name": "1.12 Knowledge Book"
+  },
+  "355": {
+    "id": 355,
+    "name": "1.12 %vb_color% Bed"
+  },
+  "235-250": {
+    "id": 159,
+    "name": "1.12 %color% Glazed Terracotta",
+    "block": true
+  }
+}

common/src/main/resources/assets/viabackwards/data/legacy-mappings.json

@@ -1,89 +0,0 @@
-{
-  "1.12": {
-    "251": {
-      "id": 159,
-      "data": -1,
-      "name": "1.12 %vb_color% Concrete",
-      "block": true
-    },
-    "252": {
-      "id": 35,
-      "data": -1,
-      "name": "1.12 %vb_color% Concrete Powder",
-      "block": true
-    },
-    "453": {
-      "id": 340,
-      "name": "1.12 Knowledge Book"
-    },
-    "355": {
-      "id": 355,
-      "name": "1.12 %vb_color% Bed"
-    },
-    "235-250": {
-      "id": 159,
-      "name": "1.12 %color% Glazed Terracotta",
-      "block": true
-    }
-  },
-  "1.11.1": {
-    "452": {
-      "id": 265,
-      "name": "1.11.1 Iron Nugget"
-    }
-  },
-  "1.11": {
-    "218": {
-      "id": 23,
-      "data": -1,
-      "name": "1.11 Observer",
-      "block": true
-    },
-    "449": {
-      "id": 418,
-      "name": "1.11 Totem of Undying"
-    },
-    "450": {
-      "id": 433,
-      "name": "1.11 Shulker Shell"
-    },
-    "219-234": {
-      "id": 158,
-      "name": "1.11 %color% Shulker Box",
-      "block": true
-    }
-  },
-  "1.10": {
-    "255": {
-      "id": 217,
-      "name": "1.10 Structure Block"
-    },
-    "217": {
-      "id": 287,
-      "name": "1.10 Structure Void",
-      "block": true
-    },
-    "213": {
-      "id": 159,
-      "data": 1,
-      "name": "1.10 Magma Block",
-      "block": true
-    },
-    "214": {
-      "id": 159,
-      "data": 14,
-      "name": "1.10 Nether Wart Block",
-      "block": true
-    },
-    "215": {
-      "id": 112,
-      "name": "1.10 Red Nether Bricks",
-      "block": true
-    },
-    "216": {
-      "id": 155,
-      "name": "1.10 Bone Block",
-      "block": true
-    }
-  }
-}