Start working on 24w09a

api/src/main/java/com/viaversion/viaversion/api/data/MappingData.java

@@ -115,5 +115,7 @@ public interface MappingData {
 
     @Nullable FullMappings getRecipeSerializerMappings();
 
+    FullMappings getItemDataSerializerMappings();
+
     @Nullable Mappings getPaintingMappings();
 }

api/src/main/java/com/viaversion/viaversion/api/data/MappingDataBase.java

@@ -45,6 +45,7 @@ public class MappingDataBase implements MappingData {
     protected FullMappings argumentTypeMappings;
     protected FullMappings entityMappings;
     protected FullMappings recipeSerializerMappings;
+    protected FullMappings itemDataSerializerMappings;
     protected ParticleMappings particleMappings;
     protected Mappings blockMappings;
     protected Mappings blockStateMappings;
@@ -86,6 +87,7 @@ public class MappingDataBase implements MappingData {
             entityMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "entities");
             argumentTypeMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "argumenttypes");
             recipeSerializerMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "recipe_serializers");
+            itemDataSerializerMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "item_serializers");
 
             final ListTag unmappedParticles = unmappedIdentifierData.get("particles");
             final ListTag mappedParticles = mappedIdentifierData.get("particles");
@@ -238,6 +240,11 @@ public class MappingDataBase implements MappingData {
         return argumentTypeMappings;
     }
 
+    @Override
+    public @Nullable FullMappings getItemDataSerializerMappings() {
+        return itemDataSerializerMappings;
+    }
+
     @Override
     public @Nullable Mappings getPaintingMappings() {
         return paintingMappings;

api/src/main/java/com/viaversion/viaversion/api/minecraft/Particle.java

@@ -24,11 +24,12 @@ package com.viaversion.viaversion.api.minecraft;
 
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
 import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.util.IdHolder;
 import io.netty.buffer.ByteBuf;
 import java.util.ArrayList;
 import java.util.List;
 
-public final class Particle {
+public final class Particle implements IdHolder {
     private final List<ParticleData<?>> arguments = new ArrayList<>(4);
     private int id;
 
@@ -36,10 +37,16 @@ public final class Particle {
         this.id = id;
     }
 
+    @Deprecated
     public int getId() {
         return id;
     }
 
+    @Override
+    public int id() {
+        return id;
+    }
+
     public void setId(final int id) {
         this.id = id;
     }

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/DataItem.java

@@ -24,7 +24,10 @@ package com.viaversion.viaversion.api.minecraft.item;
 
 import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
 import com.google.gson.annotations.SerializedName;
+import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
 import java.util.Objects;
+import java.util.Optional;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class DataItem implements Item {
@@ -91,6 +94,11 @@ public class DataItem implements Item {
         this.tag = tag;
     }
 
+    @Override
+    public Int2ObjectMap<Optional<ItemData<?>>> itemData() {
+        return new Int2ObjectOpenHashMap<>();
+    }
+
     @Override
     public Item copy() {
         return new DataItem(identifier, amount, data, tag);

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/DynamicItem.java

@@ -0,0 +1,114 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item;
+
+import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import java.util.Optional;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class DynamicItem implements Item {
+    private final Int2ObjectMap<Optional<ItemData<?>>> data;
+    private int identifier;
+    private byte amount;
+
+    public DynamicItem() {
+        this(0, (byte) 0, new Int2ObjectOpenHashMap<>());
+    }
+
+    public DynamicItem(int identifier, byte amount, Int2ObjectMap<Optional<ItemData<?>>> data) {
+        this.identifier = identifier;
+        this.amount = amount;
+        this.data = data;
+    }
+
+    @Override
+    public int identifier() {
+        return identifier;
+    }
+
+    @Override
+    public void setIdentifier(int identifier) {
+        this.identifier = identifier;
+    }
+
+    @Override
+    public int amount() {
+        return amount;
+    }
+
+    @Override
+    public void setAmount(int amount) {
+        if (amount > Byte.MAX_VALUE || amount < Byte.MIN_VALUE) {
+            throw new IllegalArgumentException("Invalid item amount: " + amount);
+        }
+        this.amount = (byte) amount;
+    }
+
+    @Override
+    public @Nullable CompoundTag tag() {
+        return null;
+    }
+
+    @Override
+    public void setTag(@Nullable CompoundTag tag) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Int2ObjectMap<Optional<ItemData<?>>> itemData() {
+        return data;
+    }
+
+    public void addData(ItemData<?> data) {
+        this.data.put(data.id(), Optional.of(data));
+    }
+
+    public void addMarkerData(int id) {
+        this.data.put(id, Optional.empty());
+    }
+
+    @Override
+    public Item copy() {
+        return new DynamicItem(identifier, amount, data);
+    }
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        final DynamicItem that = (DynamicItem) o;
+        if (identifier != that.identifier) return false;
+        if (amount != that.amount) return false;
+        return data.equals(that.data);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = data.hashCode();
+        result = 31 * result + identifier;
+        result = 31 * result + amount;
+        return result;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/Item.java

@@ -23,6 +23,8 @@
 package com.viaversion.viaversion.api.minecraft.item;
 
 import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+import java.util.Optional;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public interface Item {
@@ -88,6 +90,8 @@ public interface Item {
      */
     void setTag(@Nullable CompoundTag tag);
 
+    Int2ObjectMap<Optional<ItemData<?>>> itemData();
+
     /**
      * Returns a copy of the item.
      *

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/ItemData.java

@@ -0,0 +1,78 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item;
+
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.util.IdHolder;
+import com.viaversion.viaversion.util.Unit;
+import io.netty.buffer.ByteBuf;
+
+public final class ItemData<T> implements IdHolder {
+
+    private final Type<T> type;
+    private T value;
+    private int id;
+
+    public ItemData(final Type<T> type, final T value, final int id) {
+        this.type = type;
+        this.value = value;
+        this.id = id;
+    }
+
+    public static ItemData<?> empty(final int id) {
+        return new ItemData<>(Type.UNIT, Unit.INSTANCE, id);
+    }
+
+    public boolean isEmpty() {
+        return type == Type.UNIT;
+    }
+
+    public void setValue(final T value) {
+        if (value != null && !type.getOutputClass().isAssignableFrom(value.getClass())) {
+            throw new IllegalArgumentException("Item data type and value are incompatible. Type=" + type
+                + ", value=" + value + " (" + value.getClass().getSimpleName() + ")");
+        }
+        this.value = value;
+    }
+
+    public void write(final ByteBuf buffer) throws Exception {
+        type.write(buffer, value);
+    }
+
+    public void setId(final int id) {
+        this.id = id;
+    }
+
+    public Type<T> type() {
+        return type;
+    }
+
+    public T value() {
+        return value;
+    }
+
+    @Override
+    public int id() {
+        return id;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/BannerPattern.java

@@ -0,0 +1,62 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.ArrayType;
+import io.netty.buffer.ByteBuf;
+
+public final class BannerPattern {
+
+    public static final Type<BannerPattern> TYPE = new Type<BannerPattern>(BannerPattern.class) {
+        @Override
+        public BannerPattern read(final ByteBuf buffer) throws Exception {
+            final int pattern = Type.VAR_INT.readPrimitive(buffer);
+            final int color = Type.VAR_INT.readPrimitive(buffer);
+            return new BannerPattern(pattern, color);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final BannerPattern value) throws Exception {
+            Type.VAR_INT.writePrimitive(buffer, value.pattern);
+            Type.VAR_INT.writePrimitive(buffer, value.color);
+        }
+    };
+    public static final Type<BannerPattern[]> ARRAY_TYPE = new ArrayType<>(TYPE);
+
+    private final int pattern;
+    private final int color;
+
+    public BannerPattern(final int pattern, final int color) {
+        this.pattern = pattern;
+        this.color = color;
+    }
+
+    public int pattern() {
+        return this.pattern;
+    }
+
+    public int color() {
+        return this.color;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/Bee.java

@@ -0,0 +1,71 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.ArrayType;
+import io.netty.buffer.ByteBuf;
+
+public final class Bee {
+
+    public static final Type<Bee> TYPE = new Type<Bee>(Bee.class) {
+        @Override
+        public Bee read(final ByteBuf buffer) throws Exception {
+            final CompoundTag entityData = Type.COMPOUND_TAG.read(buffer);
+            final int ticksInHive = Type.VAR_INT.readPrimitive(buffer);
+            final int minTicksInHive = Type.VAR_INT.readPrimitive(buffer);
+            return new Bee(entityData, ticksInHive, minTicksInHive);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final Bee value) throws Exception {
+            Type.COMPOUND_TAG.write(buffer, value.entityData);
+            Type.VAR_INT.writePrimitive(buffer, value.ticksInHive);
+            Type.VAR_INT.writePrimitive(buffer, value.minTicksInHive);
+        }
+    };
+    public static final Type<Bee[]> ARRAY_TYPE = new ArrayType<>(TYPE);
+
+    private final CompoundTag entityData;
+    private final int ticksInHive;
+    private final int minTicksInHive;
+
+    public Bee(CompoundTag entityData, int ticksInHive, int minTicksInHive) {
+        this.entityData = entityData;
+        this.ticksInHive = ticksInHive;
+        this.minTicksInHive = minTicksInHive;
+    }
+
+    public CompoundTag entityData() {
+        return entityData;
+    }
+
+    public int ticksInHive() {
+        return ticksInHive;
+    }
+
+    public int minTicksInHive() {
+        return minTicksInHive;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/BlockStateProperties.java

@@ -0,0 +1,62 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.type.Type;
+import io.netty.buffer.ByteBuf;
+import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
+import java.util.Map;
+
+public final class BlockStateProperties {
+
+    public static final Type<BlockStateProperties> TYPE = new Type<BlockStateProperties>(BlockStateProperties.class) {
+        @Override
+        public BlockStateProperties read(final ByteBuf buffer) throws Exception {
+            final int size = Type.VAR_INT.readPrimitive(buffer);
+            final Map<String, String> properties = new Object2ObjectOpenHashMap<>(size);
+            for (int i = 0; i < size; i++) {
+                properties.put(Type.STRING.read(buffer), Type.STRING.read(buffer));
+            }
+            return new BlockStateProperties(properties);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final BlockStateProperties value) throws Exception {
+            Type.VAR_INT.writePrimitive(buffer, value.properties.size());
+            for (final Map.Entry<String, String> entry : value.properties.entrySet()) {
+                Type.STRING.write(buffer, entry.getKey());
+                Type.STRING.write(buffer, entry.getValue());
+            }
+        }
+    };
+
+    private final Map<String, String> properties;
+
+    public BlockStateProperties(final Map<String, String> properties) {
+        this.properties = properties;
+    }
+
+    public Map<String, String> properties() {
+        return properties;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/DyedColor.java

@@ -0,0 +1,60 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.type.Type;
+import io.netty.buffer.ByteBuf;
+
+public final class DyedColor {
+
+    public static final Type<DyedColor> TYPE = new Type<DyedColor>(DyedColor.class) {
+        @Override
+        public DyedColor read(final ByteBuf buffer) {
+            final int rgb = buffer.readInt();
+            final boolean showInTooltip = buffer.readBoolean();
+            return new DyedColor(rgb, showInTooltip);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final DyedColor value) {
+            buffer.writeInt(value.rgb);
+            buffer.writeBoolean(value.showInTooltip);
+        }
+    };
+
+    private final int rgb;
+    private final boolean showInTooltip;
+
+    public DyedColor(final int rgb, final boolean showInTooltip) {
+        this.rgb = rgb;
+        this.showInTooltip = showInTooltip;
+    }
+
+    public int rgb() {
+        return this.rgb;
+    }
+
+    public boolean showInTooltip() {
+        return this.showInTooltip;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/Enchantments.java

@@ -0,0 +1,72 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.type.Type;
+import io.netty.buffer.ByteBuf;
+import it.unimi.dsi.fastutil.ints.Int2IntMap;
+import it.unimi.dsi.fastutil.ints.Int2IntOpenHashMap;
+
+public final class Enchantments {
+
+    public static final Type<Enchantments> TYPE = new Type<Enchantments>(Enchantments.class) {
+        @Override
+        public Enchantments read(final ByteBuf buffer) {
+            final Int2IntMap enchantments = new Int2IntOpenHashMap();
+            final int size = Type.VAR_INT.readPrimitive(buffer);
+            for (int i = 0; i < size; i++) {
+                final int id = Type.VAR_INT.readPrimitive(buffer);
+                final int level = Type.VAR_INT.readPrimitive(buffer);
+                enchantments.put(id, level);
+            }
+
+            return new Enchantments(enchantments, buffer.readBoolean());
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final Enchantments value) {
+            Type.VAR_INT.writePrimitive(buffer, value.enchantments.size());
+            for (final Int2IntMap.Entry entry : value.enchantments.int2IntEntrySet()) {
+                Type.VAR_INT.writePrimitive(buffer, entry.getIntValue());
+                Type.VAR_INT.writePrimitive(buffer, entry.getIntValue());
+            }
+            buffer.writeBoolean(value.showInTooltip());
+        }
+    };
+
+    private final Int2IntMap enchantments;
+    private final boolean showInTooltip;
+
+    public Enchantments(final Int2IntMap enchantments, final boolean showInTooltip) {
+        this.enchantments = enchantments;
+        this.showInTooltip = showInTooltip;
+    }
+
+    public Int2IntMap enchantments() {
+        return enchantments;
+    }
+
+    public boolean showInTooltip() {
+        return showInTooltip;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/GameProfile.java

@@ -0,0 +1,106 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.type.Type;
+import io.netty.buffer.ByteBuf;
+import java.util.UUID;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public final class GameProfile {
+
+    public static final Type<GameProfile> TYPE = new Type<GameProfile>(GameProfile.class) {
+        @Override
+        public GameProfile read(final ByteBuf buffer) throws Exception {
+            final String name = Type.STRING.read(buffer);
+            final UUID id = Type.OPTIONAL_UUID.read(buffer);
+            final int propertyCount = Type.VAR_INT.readPrimitive(buffer);
+            final Property[] properties = new Property[propertyCount];
+            for (int i = 0; i < propertyCount; i++) {
+                final String propertyName = Type.STRING.read(buffer);
+                final String propertyValue = Type.STRING.read(buffer);
+                final String propertySignature = Type.OPTIONAL_STRING.read(buffer);
+                properties[i] = new Property(propertyName, propertyValue, propertySignature);
+            }
+            return new GameProfile(name, id, properties);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final GameProfile value) throws Exception {
+            Type.STRING.write(buffer, value.name);
+            Type.OPTIONAL_UUID.write(buffer, value.id);
+            Type.VAR_INT.writePrimitive(buffer, value.properties.length);
+            for (final Property property : value.properties) {
+                Type.STRING.write(buffer, property.name);
+                Type.STRING.write(buffer, property.value);
+                Type.OPTIONAL_STRING.write(buffer, property.signature);
+            }
+        }
+    };
+
+    private final String name;
+    private final UUID id;
+    private final Property[] properties;
+
+    public GameProfile(final String name, @Nullable final UUID id, final Property[] properties) {
+        this.name = name;
+        this.id = id;
+        this.properties = properties;
+    }
+
+    public String name() {
+        return name;
+    }
+
+    public @Nullable UUID id() {
+        return id;
+    }
+
+    public Property[] properties() {
+        return properties;
+    }
+
+    public static final class Property {
+        private final String name;
+        private final String value;
+        private final String signature;
+
+        public Property(final String name, final String value, @Nullable final String signature) {
+            this.name = name;
+            this.value = value;
+            this.signature = signature;
+        }
+
+        public String name() {
+            return name;
+        }
+
+        public String value() {
+            return value;
+        }
+
+        public @Nullable String signature() {
+            return signature;
+        }
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/LodestoneTarget.java

@@ -0,0 +1,61 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.minecraft.GlobalPosition;
+import com.viaversion.viaversion.api.type.Type;
+import io.netty.buffer.ByteBuf;
+
+public final class LodestoneTarget {
+
+    public static final Type<LodestoneTarget> TYPE = new Type<LodestoneTarget>(LodestoneTarget.class) {
+        @Override
+        public LodestoneTarget read(final ByteBuf buffer) throws Exception {
+            final GlobalPosition position = Type.GLOBAL_POSITION.read(buffer);
+            final boolean tracked = buffer.readBoolean();
+            return new LodestoneTarget(position, tracked);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final LodestoneTarget value) throws Exception {
+            Type.GLOBAL_POSITION.write(buffer, value.position);
+            buffer.writeBoolean(value.tracked);
+        }
+    };
+
+    private final GlobalPosition position;
+    private final boolean tracked;
+
+    public LodestoneTarget(final GlobalPosition position, final boolean tracked) {
+        this.position = position;
+        this.tracked = tracked;
+    }
+
+    public GlobalPosition pos() {
+        return this.position;
+    }
+
+    public boolean tracked() {
+        return this.tracked;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/WrittenBook.java

@@ -0,0 +1,84 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.type.Type;
+import io.netty.buffer.ByteBuf;
+
+public final class WrittenBook {
+
+    public static final Type<WrittenBook> TYPE = new Type<WrittenBook>(WrittenBook.class) {
+        @Override
+        public WrittenBook read(final ByteBuf buffer) throws Exception {
+            final String title = Type.STRING.read(buffer);
+            final String author = Type.STRING.read(buffer);
+            final int generation = Type.VAR_INT.readPrimitive(buffer);
+            final String[] pages = Type.STRING_ARRAY.read(buffer);
+            final boolean resolved = buffer.readBoolean();
+            return new WrittenBook(title, author, generation, pages, resolved);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final WrittenBook value) throws Exception {
+            Type.STRING.write(buffer, value.title);
+            Type.STRING.write(buffer, value.author);
+            Type.VAR_INT.writePrimitive(buffer, value.generation);
+            Type.STRING_ARRAY.write(buffer, value.pages);
+            buffer.writeBoolean(value.resolved);
+        }
+    };
+
+    private final String title;
+    private final String author;
+    private final int generation;
+    private final String[] pages;
+    private final boolean resolved;
+
+    public WrittenBook(final String title, final String author, final int generation, final String[] pages, final boolean resolved) {
+        this.title = title;
+        this.author = author;
+        this.generation = generation;
+        this.pages = pages;
+        this.resolved = resolved;
+    }
+
+    public String title() {
+        return title;
+    }
+
+    public String author() {
+        return author;
+    }
+
+    public int generation() {
+        return generation;
+    }
+
+    public String[] pages() {
+        return pages;
+    }
+
+    public boolean resolved() {
+        return resolved;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/metadata/MetaType.java

@@ -22,6 +22,7 @@
  */
 package com.viaversion.viaversion.api.minecraft.metadata;
 
+import com.google.common.base.Preconditions;
 import com.viaversion.viaversion.api.type.Type;
 
 public interface MetaType {
@@ -49,6 +50,7 @@ public interface MetaType {
         private final Type<?> type;
 
         MetaTypeImpl(final int typeId, final Type<?> type) {
+            Preconditions.checkNotNull(type);
             this.typeId = typeId;
             this.type = type;
         }

api/src/main/java/com/viaversion/viaversion/api/minecraft/metadata/types/MetaTypes1_20_5.java

@@ -25,6 +25,7 @@ package com.viaversion.viaversion.api.minecraft.metadata.types;
 import com.viaversion.viaversion.api.minecraft.metadata.MetaType;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+import com.viaversion.viaversion.api.type.types.version.Types1_20_5;
 
 public final class MetaTypes1_20_5 extends AbstractMetaTypes {
 
@@ -35,7 +36,7 @@ public final class MetaTypes1_20_5 extends AbstractMetaTypes {
     public final MetaType stringType = add(4, Type.STRING);
     public final MetaType componentType = add(5, Type.TAG);
     public final MetaType optionalComponentType = add(6, Type.OPTIONAL_TAG);
-    public final MetaType itemType = add(7, Type.ITEM1_20_2);
+    public final MetaType itemType = add(7, Types1_20_5.ITEM);
     public final MetaType booleanType = add(8, Type.BOOLEAN);
     public final MetaType rotationType = add(9, Type.ROTATION);
     public final MetaType positionType = add(10, Type.POSITION1_14);

api/src/main/java/com/viaversion/viaversion/api/protocol/version/ProtocolVersion.java

@@ -83,7 +83,7 @@ public class ProtocolVersion implements Comparable<ProtocolVersion> {
     public static final ProtocolVersion v1_20 = register(763, "1.20/1.20.1", new SubVersionRange("1.20", 0, 1));
     public static final ProtocolVersion v1_20_2 = register(764, "1.20.2");
     public static final ProtocolVersion v1_20_3 = register(765, "1.20.3/1.20.4", new SubVersionRange("1.20", 3, 4));
-    public static final ProtocolVersion v1_20_5 = register(766, 177, "1.20.5");
+    public static final ProtocolVersion v1_20_5 = register(766, 178, "1.20.5");
     public static final ProtocolVersion unknown = new ProtocolVersion(VersionType.SPECIAL, -1, -1, "UNKNOWN", null);
 
     public static ProtocolVersion register(int version, String name) {

api/src/main/java/com/viaversion/viaversion/api/type/Type.java

@@ -56,6 +56,7 @@ import com.viaversion.viaversion.api.type.types.ShortByteArrayType;
 import com.viaversion.viaversion.api.type.types.ShortType;
 import com.viaversion.viaversion.api.type.types.StringType;
 import com.viaversion.viaversion.api.type.types.UUIDType;
+import com.viaversion.viaversion.api.type.types.UnitType;
 import com.viaversion.viaversion.api.type.types.UnsignedByteType;
 import com.viaversion.viaversion.api.type.types.UnsignedShortType;
 import com.viaversion.viaversion.api.type.types.VarIntArrayType;
@@ -87,6 +88,7 @@ import com.viaversion.viaversion.api.type.types.block.VarLongBlockChangeRecordTy
 import com.viaversion.viaversion.api.type.types.math.Vector3fType;
 import com.viaversion.viaversion.api.type.types.math.VectorType;
 import com.viaversion.viaversion.api.type.types.misc.VillagerDataType;
+import com.viaversion.viaversion.util.Unit;
 import java.util.UUID;
 
 /**
@@ -96,6 +98,8 @@ import java.util.UUID;
  */
 public abstract class Type<T> implements ByteBufReader<T>, ByteBufWriter<T> {
 
+    public static final Type<Unit> UNIT = new UnitType();
+
     public static final ByteType BYTE = new ByteType();
     public static final UnsignedByteType UNSIGNED_BYTE = new UnsignedByteType();
     public static final Type<byte[]> BYTE_ARRAY_PRIMITIVE = new ByteArrayType();
@@ -149,6 +153,7 @@ public abstract class Type<T> implements ByteBufReader<T>, ByteBufWriter<T> {
     public static final Type<CompoundTag> COMPOUND_TAG = new CompoundTagType();
     public static final Type<CompoundTag> OPTIONAL_COMPOUND_TAG = new CompoundTagType.OptionalCompoundTagType();
     public static final Type<Tag> TAG = new TagType();
+    public static final Type<Tag[]> TAG_ARRAY = new ArrayType<>(TAG);
     public static final Type<Tag> OPTIONAL_TAG = new TagType.OptionalTagType();
     @Deprecated/*(forRemoval=true)*/
     public static final Type<CompoundTag> NBT = NAMED_COMPOUND_TAG;

api/src/main/java/com/viaversion/viaversion/api/type/types/UnitType.java

@@ -0,0 +1,43 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.type.types;
+
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.util.Unit;
+import io.netty.buffer.ByteBuf;
+
+public final class UnitType extends Type<Unit> {
+
+    public UnitType() {
+        super(Unit.class);
+    }
+
+    @Override
+    public Unit read(final ByteBuf buffer) throws Exception {
+        return Unit.INSTANCE;
+    }
+
+    @Override
+    public void write(final ByteBuf buffer, final Unit value) throws Exception {
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/type/types/item/ItemDataType.java

@@ -0,0 +1,89 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.type.types.item;
+
+import com.viaversion.viaversion.api.data.FullMappings;
+import com.viaversion.viaversion.api.minecraft.item.ItemData;
+import com.viaversion.viaversion.api.protocol.Protocol;
+import com.viaversion.viaversion.api.type.Type;
+import io.netty.buffer.ByteBuf;
+import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+
+public class ItemDataType extends Type<ItemData<?>> {
+
+    private final Int2ObjectMap<Type<?>> types = new Int2ObjectOpenHashMap<>();
+
+    public ItemDataType() {
+        super(ItemData.class);
+    }
+
+    @Override
+    public void write(final ByteBuf buffer, final ItemData<?> object) throws Exception {
+        Type.VAR_INT.writePrimitive(buffer, object.id());
+        object.write(buffer);
+    }
+
+    @Override
+    public ItemData<?> read(final ByteBuf buffer) throws Exception {
+        final int id = Type.VAR_INT.readPrimitive(buffer);
+        final Type<?> type = this.types.get(id);
+        if (type != null) {
+            return readItemData(buffer, type, id);
+        }
+        throw new IllegalArgumentException("Unknown item data type id: " + id);
+    }
+
+    private <T> ItemData<T> readItemData(final ByteBuf buffer, final Type<T> type, final int id) throws Exception {
+        return new ItemData<>(type, type.read(buffer), id);
+    }
+
+    public DataFiller filler(final Protocol<?, ?, ?, ?> protocol) {
+        return filler(protocol, true);
+    }
+
+    public DataFiller filler(final Protocol<?, ?, ?, ?> protocol, final boolean useMappedNames) {
+        return new DataFiller(protocol, useMappedNames);
+    }
+
+    public final class DataFiller {
+
+        private final FullMappings mappings;
+        private final boolean useMappedNames;
+
+        private DataFiller(final Protocol<?, ?, ?, ?> protocol, final boolean useMappedNames) {
+            this.mappings = protocol.getMappingData().getItemDataSerializerMappings();
+            this.useMappedNames = useMappedNames;
+        }
+
+        public DataFiller reader(final String identifier, final Type<?> reader) {
+            types.put(useMappedNames ? mappings.mappedId(identifier) : mappings.id(identifier), reader);
+            return this;
+        }
+
+        public DataFiller reader(final int id, final Type<?> type) {
+            types.put(id, type);
+            return this;
+        }
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/type/types/item/ItemType1_20_5.java

@@ -0,0 +1,111 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.type.types.item;
+
+import com.viaversion.viaversion.api.minecraft.item.DynamicItem;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.minecraft.item.ItemData;
+import com.viaversion.viaversion.api.type.Type;
+import io.netty.buffer.ByteBuf;
+import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import java.util.Optional;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class ItemType1_20_5 extends Type<Item> {
+
+    private final Type<ItemData<?>> dataType;
+
+    public ItemType1_20_5(final Type<ItemData<?>> itemDataType) {
+        super(Item.class);
+        this.dataType = itemDataType;
+    }
+
+    @Override
+    public @Nullable Item read(final ByteBuf buffer) throws Exception {
+        final byte amount = buffer.readByte();
+        if (amount <= 0) {
+            return null;
+        }
+
+        final int id = Type.VAR_INT.readPrimitive(buffer);
+        final Int2ObjectMap<Optional<ItemData<?>>> data = readData(buffer);
+        return new DynamicItem(id, amount, data);
+    }
+
+    private Int2ObjectMap<Optional<ItemData<?>>> readData(final ByteBuf buffer) throws Exception {
+        final int valuesSize = Type.VAR_INT.readPrimitive(buffer);
+        final int markersSize = Type.VAR_INT.readPrimitive(buffer);
+        if (valuesSize == 0 && markersSize == 0) {
+            return new Int2ObjectOpenHashMap<>();
+        }
+
+        final Int2ObjectMap<Optional<ItemData<?>>> map = new Int2ObjectOpenHashMap<>(valuesSize + markersSize);
+        for (int i = 0; i < valuesSize; i++) {
+            final ItemData<?> value = dataType.read(buffer);
+            map.put(value.id(), Optional.of(value));
+        }
+
+        for (int i = 0; i < markersSize; i++) {
+            final int key = Type.VAR_INT.readPrimitive(buffer);
+            map.put(key, Optional.empty());
+        }
+        return map;
+    }
+
+    @Override
+    public void write(final ByteBuf buffer, @Nullable final Item object) throws Exception {
+        if (object == null) {
+            buffer.writeByte(0);
+            return;
+        }
+
+        buffer.writeByte(object.amount());
+        Type.VAR_INT.writePrimitive(buffer, object.identifier());
+
+        final Int2ObjectMap<Optional<ItemData<?>>> data = object.itemData();
+        int valuesSize = 0;
+        int markersSize = 0;
+        for (final Int2ObjectMap.Entry<Optional<ItemData<?>>> entry : data.int2ObjectEntrySet()) {
+            if (entry.getValue().isPresent()) {
+                valuesSize++;
+            } else {
+                markersSize++;
+            }
+        }
+
+        Type.VAR_INT.writePrimitive(buffer, valuesSize);
+        Type.VAR_INT.writePrimitive(buffer, markersSize);
+
+        for (final Int2ObjectMap.Entry<Optional<ItemData<?>>> entry : data.int2ObjectEntrySet()) {
+            if (entry.getValue().isPresent()) {
+                dataType.write(buffer, entry.getValue().get());
+            }
+        }
+        for (final Int2ObjectMap.Entry<Optional<ItemData<?>>> entry : data.int2ObjectEntrySet()) {
+            if (!entry.getValue().isPresent()) {
+                Type.VAR_INT.writePrimitive(buffer, entry.getIntKey());
+            }
+        }
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/type/types/misc/DynamicType.java

@@ -0,0 +1,96 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.type.types.misc;
+
+import com.viaversion.viaversion.api.data.FullMappings;
+import com.viaversion.viaversion.api.protocol.Protocol;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.util.IdHolder;
+import io.netty.buffer.ByteBuf;
+import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+
+public abstract class DynamicType<T extends IdHolder> extends Type<T> {
+
+    protected final Int2ObjectMap<DataReader<T>> readers;
+
+    protected DynamicType(final Int2ObjectMap<DataReader<T>> readers, final Class<T> outputClass) {
+        super(outputClass.getSimpleName(), outputClass);
+        this.readers = readers;
+    }
+
+    protected DynamicType(final Class<T> outputClass) {
+        this(new Int2ObjectOpenHashMap<>(), outputClass);
+    }
+
+    public DataFiller filler(final Protocol<?, ?, ?, ?> protocol) {
+        return filler(protocol, true);
+    }
+
+    public DataFiller filler(final Protocol<?, ?, ?, ?> protocol, final boolean useMappedNames) {
+        return new DataFiller(protocol, useMappedNames);
+    }
+
+    protected void readData(final ByteBuf buffer, final T value) throws Exception {
+        final DataReader<T> reader = readers.get(value.id());
+        if (reader != null) {
+            reader.read(buffer, value);
+        }
+    }
+
+    public final class DataFiller {
+
+        private final FullMappings mappings;
+        private final boolean useMappedNames;
+
+        private DataFiller(final Protocol<?, ?, ?, ?> protocol, final boolean useMappedNames) {
+            this.mappings = mappings(protocol);
+            this.useMappedNames = useMappedNames;
+        }
+
+        public DataFiller reader(final String identifier, final DataReader<T> reader) {
+            readers.put(useMappedNames ? mappings.mappedId(identifier) : mappings.id(identifier), reader);
+            return this;
+        }
+
+        public DataFiller reader(final int id, final DataReader<T> reader) {
+            readers.put(id, reader);
+            return this;
+        }
+    }
+
+    protected abstract FullMappings mappings(Protocol<?, ?, ?, ?> protocol);
+
+    @FunctionalInterface
+    public interface DataReader<T> {
+
+        /**
+         * Reads a value from the buffer and adds it to the data.
+         *
+         * @param buf   buffer
+         * @param value value
+         * @throws Exception if an error occurs during buffer reading
+         */
+        void read(ByteBuf buf, T value) throws Exception;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/type/types/misc/ParticleType.java

@@ -23,40 +23,23 @@
 package com.viaversion.viaversion.api.type.types.misc;
 
 import com.viaversion.viaversion.api.Via;
-import com.viaversion.viaversion.api.data.ParticleMappings;
+import com.viaversion.viaversion.api.data.FullMappings;
 import com.viaversion.viaversion.api.minecraft.Particle;
 import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.util.Key;
 import io.netty.buffer.ByteBuf;
-import it.unimi.dsi.fastutil.ints.Int2ObjectArrayMap;
-import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 
-public class ParticleType extends Type<Particle> {
-
-    private final Int2ObjectMap<ParticleReader> readers;
-
-    public ParticleType(final Int2ObjectMap<ParticleReader> readers) {
-        super("Particle", Particle.class);
-        this.readers = readers;
-    }
+public class ParticleType extends DynamicType<Particle> {
 
     public ParticleType() {
-        this(new Int2ObjectArrayMap<>());
-    }
-
-    public ParticleTypeFiller filler(final Protocol<?, ?, ?, ?> protocol) {
-        return filler(protocol, true);
-    }
-
-    public ParticleTypeFiller filler(final Protocol<?, ?, ?, ?> protocol, final boolean useMappedNames) {
-        return new ParticleTypeFiller(protocol, useMappedNames);
+        super(Particle.class);
     }
 
     @Override
     public void write(final ByteBuf buffer, final Particle object) throws Exception {
-        Type.VAR_INT.writePrimitive(buffer, object.getId());
+        Type.VAR_INT.writePrimitive(buffer, object.id());
         for (final Particle.ParticleData<?> data : object.getArguments()) {
             data.write(buffer);
         }
@@ -70,32 +53,30 @@ public class ParticleType extends Type<Particle> {
         return particle;
     }
 
-    public void readData(final ByteBuf buffer, final Particle particle) throws Exception {
-        final ParticleReader reader = readers.get(particle.getId());
-        if (reader != null) {
-            reader.read(buffer, particle);
-        }
+    @Override
+    protected FullMappings mappings(final Protocol<?, ?, ?, ?> protocol) {
+        return protocol.getMappingData().getParticleMappings();
     }
 
-    public static ParticleReader itemHandler(final Type<Item> itemType) {
+    public static DataReader<Particle> itemHandler(final Type<Item> itemType) {
         return (buf, particle) -> particle.add(itemType, itemType.read(buf));
     }
 
     public static final class Readers {
 
-        public static final ParticleReader BLOCK = (buf, particle) -> {
+        public static final DataReader<Particle> BLOCK = (buf, particle) -> {
             particle.add(Type.VAR_INT, Type.VAR_INT.readPrimitive(buf)); // Flat Block
         };
-        public static final ParticleReader ITEM1_13 = itemHandler(Type.ITEM1_13);
-        public static final ParticleReader ITEM1_13_2 = itemHandler(Type.ITEM1_13_2);
-        public static final ParticleReader ITEM1_20_2 = itemHandler(Type.ITEM1_20_2);
-        public static final ParticleReader DUST = (buf, particle) -> {
+        public static final DataReader<Particle> ITEM1_13 = itemHandler(Type.ITEM1_13);
+        public static final DataReader<Particle> ITEM1_13_2 = itemHandler(Type.ITEM1_13_2);
+        public static final DataReader<Particle> ITEM1_20_2 = itemHandler(Type.ITEM1_20_2);
+        public static final DataReader<Particle> DUST = (buf, particle) -> {
             particle.add(Type.FLOAT, Type.FLOAT.readPrimitive(buf)); // Red 0-1
             particle.add(Type.FLOAT, Type.FLOAT.readPrimitive(buf)); // Green 0-1
             particle.add(Type.FLOAT, Type.FLOAT.readPrimitive(buf)); // Blue 0-1
             particle.add(Type.FLOAT, Type.FLOAT.readPrimitive(buf)); // Scale 0.01-4
         };
-        public static final ParticleReader DUST_TRANSITION = (buf, particle) -> {
+        public static final DataReader<Particle> DUST_TRANSITION = (buf, particle) -> {
             particle.add(Type.FLOAT, Type.FLOAT.readPrimitive(buf)); // Red 0-1
             particle.add(Type.FLOAT, Type.FLOAT.readPrimitive(buf)); // Green 0-1
             particle.add(Type.FLOAT, Type.FLOAT.readPrimitive(buf)); // Blue 0-1
@@ -104,7 +85,7 @@ public class ParticleType extends Type<Particle> {
             particle.add(Type.FLOAT, Type.FLOAT.readPrimitive(buf)); // Green
             particle.add(Type.FLOAT, Type.FLOAT.readPrimitive(buf)); // Blue
         };
-        public static final ParticleReader VIBRATION = (buf, particle) -> {
+        public static final DataReader<Particle> VIBRATION = (buf, particle) -> {
             particle.add(Type.POSITION1_14, Type.POSITION1_14.read(buf)); // From block pos
 
             String resourceLocation = Type.STRING.read(buf);
@@ -120,7 +101,7 @@ public class ParticleType extends Type<Particle> {
             }
             particle.add(Type.VAR_INT, Type.VAR_INT.readPrimitive(buf)); // Arrival in ticks
         };
-        public static final ParticleReader VIBRATION1_19 = (buf, particle) -> {
+        public static final DataReader<Particle> VIBRATION1_19 = (buf, particle) -> {
             String resourceLocation = Type.STRING.read(buf);
             particle.add(Type.STRING, resourceLocation);
 
@@ -135,7 +116,7 @@ public class ParticleType extends Type<Particle> {
             }
             particle.add(Type.VAR_INT, Type.VAR_INT.readPrimitive(buf)); // Arrival in ticks
         };
-        public static final ParticleReader VIBRATION1_20_3 = (buf, particle) -> {
+        public static final DataReader<Particle> VIBRATION1_20_3 = (buf, particle) -> {
             final int sourceTypeId = Type.VAR_INT.readPrimitive(buf);
             particle.add(Type.VAR_INT, sourceTypeId);
             if (sourceTypeId == 0) { // Block
@@ -148,45 +129,11 @@ public class ParticleType extends Type<Particle> {
             }
             particle.add(Type.VAR_INT, Type.VAR_INT.readPrimitive(buf)); // Arrival in ticks
         };
-        public static final ParticleReader SCULK_CHARGE = (buf, particle) -> {
+        public static final DataReader<Particle> SCULK_CHARGE = (buf, particle) -> {
             particle.add(Type.FLOAT, Type.FLOAT.readPrimitive(buf)); // Roll
         };
-        public static final ParticleReader SHRIEK = (buf, particle) -> {
+        public static final DataReader<Particle> SHRIEK = (buf, particle) -> {
             particle.add(Type.VAR_INT, Type.VAR_INT.readPrimitive(buf)); // Delay
         };
     }
-
-    public final class ParticleTypeFiller {
-
-        private final ParticleMappings mappings;
-        private final boolean useMappedNames;
-
-        private ParticleTypeFiller(final Protocol<?, ?, ?, ?> protocol, final boolean useMappedNames) {
-            this.mappings = protocol.getMappingData().getParticleMappings();
-            this.useMappedNames = useMappedNames;
-        }
-
-        public ParticleTypeFiller reader(final String identifier, final ParticleReader reader) {
-            readers.put(useMappedNames ? mappings.mappedId(identifier) : mappings.id(identifier), reader);
-            return this;
-        }
-
-        public ParticleTypeFiller reader(final int id, final ParticleReader reader) {
-            readers.put(id, reader);
-            return this;
-        }
-    }
-
-    @FunctionalInterface
-    public interface ParticleReader {
-
-        /**
-         * Reads particle data from the buffer and adds it to the particle data.
-         *
-         * @param buf      buffer
-         * @param particle particle
-         * @throws Exception if an error occurs during buffer reading
-         */
-        void read(ByteBuf buf, Particle particle) throws Exception;
-    }
 }

api/src/main/java/com/viaversion/viaversion/api/type/types/version/Types1_20_5.java

@@ -22,9 +22,13 @@
  */
 package com.viaversion.viaversion.api.type.types.version;
 
+import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.minecraft.metadata.Metadata;
 import com.viaversion.viaversion.api.minecraft.metadata.types.MetaTypes1_20_5;
 import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.ArrayType;
+import com.viaversion.viaversion.api.type.types.item.ItemType1_20_5;
+import com.viaversion.viaversion.api.type.types.item.ItemDataType;
 import com.viaversion.viaversion.api.type.types.metadata.MetaListType;
 import com.viaversion.viaversion.api.type.types.metadata.MetadataType;
 import com.viaversion.viaversion.api.type.types.misc.ParticleType;
@@ -32,7 +36,12 @@ import java.util.List;
 
 public final class Types1_20_5 {
 
-    public static final ParticleType PARTICLE = new ParticleType(); // Only safe to use after protocol loading
+    // Only safe to use after protocol loading
+    public static final ParticleType PARTICLE = new ParticleType();
+    public static final ItemDataType ITEM_DATA = new ItemDataType();
+    public static final Type<Item> ITEM = new ItemType1_20_5(ITEM_DATA);
+    public static final Type<Item[]> ITEM_ARRAY = new ArrayType<>(ITEM);
+
     public static final MetaTypes1_20_5 META_TYPES = new MetaTypes1_20_5(PARTICLE);
     public static final Type<Metadata> METADATA = new MetadataType(META_TYPES);
     public static final Type<List<Metadata>> METADATA_LIST = new MetaListType(METADATA);

api/src/main/java/com/viaversion/viaversion/util/IdHolder.java

@@ -0,0 +1,28 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.util;
+
+public interface IdHolder {
+
+    int id();
+}

api/src/main/java/com/viaversion/viaversion/util/Key.java

@@ -22,8 +22,13 @@
  */
 package com.viaversion.viaversion.util;
 
+import java.util.regex.Pattern;
+
 public final class Key {
 
+    private static final Pattern PATTERN = Pattern.compile("([0-9a-z_.-]*:)?[0-9a-z_/.-]*");
+    private static final int MINECRAFT_NAMESPACE_LENGTH = "minecraft:".length();
+
     public static String stripNamespace(final String identifier) {
         int index = identifier.indexOf(':');
         if (index == -1) {
@@ -34,13 +39,17 @@ public final class Key {
 
     public static String stripMinecraftNamespace(final String identifier) {
         if (identifier.startsWith("minecraft:")) {
-            return identifier.substring(10);
-        } else if (identifier.startsWith(":")) {
+            return identifier.substring(MINECRAFT_NAMESPACE_LENGTH);
+        } else if (!identifier.isEmpty() && identifier.charAt(0) == ':') {
             return identifier.substring(1);
         }
         return identifier;
     }
 
+    public static boolean equals(final String firstIdentifier, final String secondIdentifier) {
+        return stripNamespace(firstIdentifier).equals(stripNamespace(secondIdentifier));
+    }
+
     public static String namespaced(final String identifier) {
         final int index = identifier.indexOf(':');
         if (index == -1) {
@@ -52,7 +61,6 @@ public final class Key {
     }
 
     public static boolean isValid(final String identifier) {
-        return identifier.matches("([0-9a-z_.-]*:)?[0-9a-z_/.-]*");
+        return PATTERN.matcher(identifier).matches();
     }
-
 }

api/src/main/java/com/viaversion/viaversion/util/Unit.java

@@ -0,0 +1,28 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.util;
+
+public enum Unit {
+
+    INSTANCE
+}

common/src/main/java/com/viaversion/viaversion/data/entity/StoredEntityDataImpl.java

@@ -19,12 +19,12 @@ package com.viaversion.viaversion.data.entity;
 
 import com.viaversion.viaversion.api.data.entity.StoredEntityData;
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import java.util.HashMap;
 import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public final class StoredEntityDataImpl implements StoredEntityData {
-    private final Map<Class<?>, Object> storedObjects = new ConcurrentHashMap<>();
+    private final Map<Class<?>, Object> storedObjects = new HashMap<>();
     private final EntityType type;
 
     public StoredEntityDataImpl(EntityType type) {

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_19_3to1_19_1/rewriter/RecipeRewriter1_19_3.java

@@ -17,6 +17,7 @@
  */
 package com.viaversion.viaversion.protocols.protocol1_19_3to1_19_1.rewriter;
 
+import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
@@ -48,7 +49,8 @@ public class RecipeRewriter1_19_3<C extends ClientboundPacketType> extends Recip
         wrapper.passthrough(Type.STRING); // Group
         wrapper.passthrough(Type.VAR_INT); // Crafting book category
         handleIngredients(wrapper);
-        rewrite(wrapper.passthrough(itemType())); // Result
+        final Item result = rewrite(wrapper.read(itemType()));
+        wrapper.write(mappedItemType(), result);
     }
 
     @Override
@@ -59,7 +61,8 @@ public class RecipeRewriter1_19_3<C extends ClientboundPacketType> extends Recip
         for (int i = 0; i < ingredients; i++) {
             handleIngredient(wrapper);
         }
-        rewrite(wrapper.passthrough(itemType())); // Result
+        final Item result = rewrite(wrapper.read(itemType()));
+        wrapper.write(mappedItemType(), result);
     }
 
     @Override
@@ -67,7 +70,8 @@ public class RecipeRewriter1_19_3<C extends ClientboundPacketType> extends Recip
         wrapper.passthrough(Type.STRING); // Group
         wrapper.passthrough(Type.VAR_INT); // Crafting book category
         handleIngredient(wrapper);
-        rewrite(wrapper.passthrough(itemType())); // Result
+        final Item result = rewrite(wrapper.read(itemType()));
+        wrapper.write(mappedItemType(), result);
         wrapper.passthrough(Type.FLOAT); // EXP
         wrapper.passthrough(Type.VAR_INT); // Cooking time
     }

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_3to1_20_2/rewriter/RecipeRewriter1_20_3.java

@@ -38,7 +38,9 @@ public class RecipeRewriter1_20_3<C extends ClientboundPacketType> extends Recip
         for (int i = 0; i < ingredients; i++) {
             handleIngredient(wrapper);
         }
-        rewrite(wrapper.passthrough(itemType())); // Result
+
+        final Item item = rewrite(wrapper.read(itemType())); // Result
+        wrapper.write(mappedItemType(), item);
         wrapper.passthrough(Type.BOOLEAN); // Show notification
     }
 

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/Protocol1_20_5To1_20_3.java

@@ -22,11 +22,19 @@ import com.viaversion.viaversion.api.data.MappingData;
 import com.viaversion.viaversion.api.data.MappingDataBase;
 import com.viaversion.viaversion.api.minecraft.RegistryType;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_20_5;
+import com.viaversion.viaversion.api.minecraft.item.data.BannerPattern;
+import com.viaversion.viaversion.api.minecraft.item.data.Bee;
+import com.viaversion.viaversion.api.minecraft.item.data.BlockStateProperties;
+import com.viaversion.viaversion.api.minecraft.item.data.DyedColor;
+import com.viaversion.viaversion.api.minecraft.item.data.GameProfile;
+import com.viaversion.viaversion.api.minecraft.item.data.LodestoneTarget;
+import com.viaversion.viaversion.api.minecraft.item.data.WrittenBook;
 import com.viaversion.viaversion.api.protocol.AbstractProtocol;
 import com.viaversion.viaversion.api.protocol.packet.State;
 import com.viaversion.viaversion.api.protocol.packet.provider.PacketTypesProvider;
 import com.viaversion.viaversion.api.protocol.packet.provider.SimplePacketTypesProvider;
 import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.minecraft.item.data.Enchantments;
 import com.viaversion.viaversion.api.type.types.misc.ParticleType;
 import com.viaversion.viaversion.api.type.types.version.Types1_20_5;
 import com.viaversion.viaversion.data.entity.EntityTrackerBase;
@@ -111,6 +119,48 @@ public final class Protocol1_20_5To1_20_3 extends AbstractProtocol<ClientboundPa
             .reader("vibration", ParticleType.Readers.VIBRATION1_20_3)
             .reader("sculk_charge", ParticleType.Readers.SCULK_CHARGE)
             .reader("shriek", ParticleType.Readers.SHRIEK);
+        Types1_20_5.ITEM_DATA.filler(this)
+            .reader("damage", Type.VAR_INT)
+            .reader("unbreakable", Type.BOOLEAN)
+            .reader("custom_name", Type.TAG)
+            .reader("lore", Type.TAG_ARRAY)
+            .reader("enchantments", Enchantments.TYPE)
+            .reader("can_place_on", Type.UNIT) // TODO
+            .reader("can_break", Type.UNIT) // TODO
+            .reader("attribute_modifiers", Type.UNIT) // TODO
+            .reader("custom_model_data", Type.VAR_INT)
+            .reader("hide_additional_tooltip", Type.UNIT)
+            .reader("repair_cost", Type.VAR_INT)
+            .reader("creative_slot_lock", Type.UNIT)
+            .reader("enchantment_glint_override", Type.BOOLEAN)
+            .reader("intangible_projectile", Type.UNIT)
+            .reader("stored_enchantments", Enchantments.TYPE)
+            .reader("dyed_color", DyedColor.TYPE)
+            .reader("map_color", Type.INT)
+            .reader("map_id", Type.VAR_INT)
+            .reader("map_post_processing", Type.VAR_INT)
+            .reader("charged_projectiles", Types1_20_5.ITEM_ARRAY)
+            .reader("bundle_contents", Types1_20_5.ITEM_ARRAY)
+            .reader("potion_contents", Type.UNIT) // TODO
+            .reader("suspicious_stew_effects", Type.UNIT) // TODO
+            .reader("writable_book_content", Type.STRING_ARRAY)
+            .reader("written_book_content", WrittenBook.TYPE)
+            .reader("trim", Type.UNIT) // TODO
+            .reader("entity_data", Type.COMPOUND_TAG)
+            .reader("bucket_entity_data", Type.COMPOUND_TAG)
+            .reader("block_entity_data", Type.COMPOUND_TAG)
+            .reader("instrument", Type.VAR_INT) // TODO
+            .reader("lodestone_target", LodestoneTarget.TYPE)
+            .reader("firework_explosion", Type.UNIT) // TODO
+            .reader("fireworks", Type.UNIT) // TODO
+            .reader("profile", GameProfile.TYPE)
+            .reader("note_block_sound", Type.STRING)
+            .reader("banner_patterns", BannerPattern.ARRAY_TYPE)
+            .reader("base_color", Type.VAR_INT)
+            .reader("pot_decorations", Types1_20_5.ITEM_ARRAY)
+            .reader("container", Types1_20_5.ITEM_ARRAY)
+            .reader("block_state", BlockStateProperties.TYPE)
+            .reader("bees", Bee.ARRAY_TYPE);
 
         tagRewriter.addTag(RegistryType.ITEM, "minecraft:dyeable", 853, 854, 855, 856, 1120);
     }

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/BlockItemPacketRewriter1_20_5.java

@@ -18,9 +18,14 @@
 package com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.rewriter;
 
 import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import com.github.steveice10.opennbt.tag.builtin.NumberTag;
+import com.viaversion.viaversion.api.Via;
 import com.viaversion.viaversion.api.data.ParticleMappings;
 import com.viaversion.viaversion.api.minecraft.Particle;
+import com.viaversion.viaversion.api.minecraft.item.DataItem;
+import com.viaversion.viaversion.api.minecraft.item.DynamicItem;
 import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.minecraft.item.ItemData;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.types.chunk.ChunkType1_20_2;
 import com.viaversion.viaversion.api.type.types.version.Types1_20_3;
@@ -34,11 +39,13 @@ import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.packet.Serverb
 import com.viaversion.viaversion.rewriter.BlockRewriter;
 import com.viaversion.viaversion.rewriter.ItemRewriter;
 import com.viaversion.viaversion.util.Key;
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<ClientboundPacket1_20_3, ServerboundPacket1_20_5, Protocol1_20_5To1_20_3> {
 
     public BlockItemPacketRewriter1_20_5(final Protocol1_20_5To1_20_3 protocol) {
-        super(protocol, Type.ITEM1_20_2, Type.ITEM1_20_2_ARRAY);
+        super(protocol, Type.ITEM1_20_2, Type.ITEM1_20_2_ARRAY, Types1_20_5.ITEM, Types1_20_5.ITEM_ARRAY);
     }
 
     @Override
@@ -88,7 +95,7 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
                 particle.add(Type.VAR_INT, protocol.getMappingData().getNewBlockStateId(blockStateId));
             } else if (mappings.isItemParticle(particleId)) {
                 final Item item = handleItemToClient(wrapper.read(Type.ITEM1_20_2));
-                particle.add(Type.ITEM1_20_2, item);
+                particle.add(Types1_20_5.ITEM, item);
             }
 
             wrapper.write(Types1_20_5.PARTICLE, particle);
@@ -120,9 +127,13 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
             wrapper.passthrough(Type.VAR_INT); // Container id
             final int size = wrapper.passthrough(Type.VAR_INT);
             for (int i = 0; i < size; i++) {
-                handleItemToClient(wrapper.passthrough(Type.ITEM1_20_2)); // Input
-                handleItemToClient(wrapper.passthrough(Type.ITEM1_20_2)); // Output
-                handleItemToClient(wrapper.passthrough(Type.ITEM1_20_2)); // Second Item
+                final Item input = handleItemToClient(wrapper.read(Type.ITEM1_20_2));
+                final Item output = handleItemToClient(wrapper.read(Type.ITEM1_20_2));
+                final Item secondItem = handleItemToClient(wrapper.read(Type.ITEM1_20_2));
+                wrapper.write(Types1_20_5.ITEM, input);
+                wrapper.write(Types1_20_5.ITEM, output);
+                wrapper.write(Types1_20_5.ITEM, secondItem);
+
                 wrapper.passthrough(Type.BOOLEAN); // Trade disabled
                 wrapper.passthrough(Type.INT); // Number of tools uses
                 wrapper.passthrough(Type.INT); // Maximum number of trade uses
@@ -135,7 +146,17 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
             }
         });
 
-        final RecipeRewriter1_20_3<ClientboundPacket1_20_3> recipeRewriter = new RecipeRewriter1_20_3<>(protocol);
+        final RecipeRewriter1_20_3<ClientboundPacket1_20_3> recipeRewriter = new RecipeRewriter1_20_3<ClientboundPacket1_20_3>(protocol) {
+            @Override
+            protected Type<Item> mappedItemType() {
+                return Types1_20_5.ITEM;
+            }
+
+            @Override
+            protected Type<Item[]> mappedItemArrayType() {
+                return Types1_20_5.ITEM_ARRAY;
+            }
+        };
         protocol.registerClientbound(ClientboundPackets1_20_3.DECLARE_RECIPES, wrapper -> {
             final int size = wrapper.passthrough(Type.VAR_INT);
             for (int i = 0; i < size; i++) {
@@ -148,4 +169,53 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
             }
         });
     }
+
+    @Override
+    public @Nullable Item handleItemToClient(@Nullable final Item item) {
+        if (item == null) return null;
+
+        super.handleItemToClient(item);
+
+        final CompoundTag tag = item.tag();
+        final DynamicItem dynamicItem = new DynamicItem(item.identifier(), (byte) item.amount(), new Int2ObjectOpenHashMap<>());
+        if (tag == null) {
+            return dynamicItem;
+        }
+
+        // Rewrite nbt to new data structures
+        final NumberTag damage = tag.getNumberTag("Damage");
+        if (damage != null) {
+            addData(dynamicItem, "damage", Type.VAR_INT, damage.asInt());
+        }
+
+        final NumberTag repairCost = tag.getNumberTag("RepairCost");
+        if (repairCost != null) {
+            addData(dynamicItem, "repair_cost", Type.VAR_INT, repairCost.asInt());
+        }
+        return dynamicItem;
+    }
+
+    private <T> void addData(final DynamicItem item, final String serializer, final Type<T> type, final T value) {
+        final int id = serializerId(serializer);
+        if (id == -1) {
+            Via.getPlatform().getLogger().severe("Could not find item data serializer for type " + type);
+            return;
+        }
+
+        item.addData(new ItemData<>(type, value, id));
+    }
+
+    private int serializerId(final String type) {
+        return protocol.getMappingData().getItemDataSerializerMappings().mappedId(type);
+    }
+
+    @Override
+    public @Nullable Item handleItemToServer(@Nullable final Item item) {
+        if (item == null) return null;
+
+        super.handleItemToServer(item);
+
+        final CompoundTag tag = new CompoundTag();
+        return new DataItem(item.identifier(), (byte) item.amount(), (short) 0, tag);
+    }
 }

common/src/main/java/com/viaversion/viaversion/rewriter/ItemRewriter.java

@@ -23,6 +23,7 @@ import com.viaversion.viaversion.api.minecraft.Particle;
 import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
 import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
@@ -33,12 +34,20 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 public class ItemRewriter<C extends ClientboundPacketType, S extends ServerboundPacketType,
     T extends Protocol<C, ?, ?, S>> extends RewriterBase<T> implements com.viaversion.viaversion.api.rewriter.ItemRewriter<T> {
     private final Type<Item> itemType;
+    private final Type<Item> mappedItemType;
     private final Type<Item[]> itemArrayType;
+    private final Type<Item[]> mappedItemArrayType;
 
-    public ItemRewriter(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType) {
+    public ItemRewriter(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType, Type<Item> mappedItemType, Type<Item[]> mappedItemArrayType) {
         super(protocol);
         this.itemType = itemType;
         this.itemArrayType = itemArrayType;
+        this.mappedItemType = mappedItemType;
+        this.mappedItemArrayType = mappedItemArrayType;
+    }
+
+    public ItemRewriter(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType) {
+        this(protocol, itemType, itemArrayType, itemType, itemArrayType);
     }
 
     // These two methods always return the same item instance *for now*
@@ -66,8 +75,13 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
             @Override
             public void register() {
                 map(Type.UNSIGNED_BYTE); // Window id
-                map(itemArrayType); // Items
-                handler(itemArrayToClientHandler(itemArrayType));
+                handler(wrapper -> {
+                    Item[] items = wrapper.read(itemArrayType);
+                    wrapper.write(mappedItemArrayType, items);
+                    for (Item item : items) {
+                        handleItemToClient(item);
+                    }
+                });
             }
         });
     }
@@ -79,12 +93,13 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
                 map(Type.UNSIGNED_BYTE); // Window id
                 map(Type.VAR_INT); // State id
                 handler(wrapper -> {
-                    Item[] items = wrapper.passthrough(itemArrayType);
+                    Item[] items = wrapper.read(itemArrayType);
+                    wrapper.write(mappedItemArrayType, items);
                     for (Item item : items) {
                         handleItemToClient(item);
                     }
 
-                    handleItemToClient(wrapper.passthrough(itemType)); // Carried item
+                    handleClientboundItem(wrapper);
                 });
             }
         });
@@ -115,8 +130,7 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
             public void register() {
                 map(Type.UNSIGNED_BYTE); // Window id
                 map(Type.SHORT); // Slot id
-                map(itemType); // Item
-                handler(itemToClientHandler(itemType));
+                handler(wrapper -> handleClientboundItem(wrapper));
             }
         });
     }
@@ -128,8 +142,7 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
                 map(Type.UNSIGNED_BYTE); // Window id
                 map(Type.VAR_INT); // State id
                 map(Type.SHORT); // Slot id
-                map(itemType); // Item
-                handler(itemToClientHandler(itemType));
+                handler(wrapper -> handleClientboundItem(wrapper));
             }
         });
     }
@@ -139,11 +152,9 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
         protocol.registerClientbound(packetType, new PacketHandlers() {
             @Override
             public void register() {
-                map(Type.VAR_INT); // 0 - Entity ID
-                map(Type.VAR_INT); // 1 - Slot ID
-                map(itemType); // 2 - Item
-
-                handler(itemToClientHandler(itemType));
+                map(Type.VAR_INT); // Entity ID
+                map(Type.VAR_INT); // Slot ID
+                handler(wrapper -> handleClientboundItem(wrapper));
             }
         });
     }
@@ -160,7 +171,7 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
                     do {
                         slot = wrapper.passthrough(Type.BYTE);
                         // & 0x7F into an extra variable if slot is needed
-                        handleItemToClient(wrapper.passthrough(itemType));
+                        handleClientboundItem(wrapper);
                     } while (slot < 0);
                 });
             }
@@ -172,8 +183,7 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
             @Override
             public void register() {
                 map(Type.SHORT); // 0 - Slot
-                map(itemType); // 1 - Clicked Item
-                handler(itemToServerHandler(itemType));
+                handler(wrapper -> handleServerboundItem(wrapper));
             }
         });
     }
@@ -187,9 +197,7 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
                 map(Type.BYTE); // 2 - Button
                 map(Type.SHORT); // 3 - Action number
                 map(Type.VAR_INT); // 4 - Mode
-                map(itemType); // 5 - Clicked Item
-
-                handler(itemToServerHandler(itemType));
+                handler(wrapper -> handleServerboundItem(wrapper));
             }
         });
     }
@@ -209,11 +217,11 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
                     int length = wrapper.passthrough(Type.VAR_INT);
                     for (int i = 0; i < length; i++) {
                         wrapper.passthrough(Type.SHORT); // Slot
-                        handleItemToServer(wrapper.passthrough(itemType));
+                        handleServerboundItem(wrapper);
                     }
 
                     // Carried item
-                    handleItemToServer(wrapper.passthrough(itemType));
+                    handleServerboundItem(wrapper);
                 });
             }
         });
@@ -232,11 +240,11 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
             wrapper.passthrough(Type.VAR_INT);
             int size = wrapper.passthrough(Type.UNSIGNED_BYTE);
             for (int i = 0; i < size; i++) {
-                handleItemToClient(wrapper.passthrough(itemType)); // Input
-                handleItemToClient(wrapper.passthrough(itemType)); // Output
+                handleClientboundItem(wrapper); // Input
+                handleClientboundItem(wrapper); // Output
 
                 if (wrapper.passthrough(Type.BOOLEAN)) { // Has second item
-                    handleItemToClient(wrapper.passthrough(itemType)); // Second Item
+                    handleClientboundItem(wrapper); // Second item
                 }
 
                 wrapper.passthrough(Type.BOOLEAN); // Trade disabled
@@ -257,9 +265,9 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
             wrapper.passthrough(Type.VAR_INT); // Container id
             int size = wrapper.passthrough(Type.VAR_INT);
             for (int i = 0; i < size; i++) {
-                handleItemToClient(wrapper.passthrough(itemType)); // Input
-                handleItemToClient(wrapper.passthrough(itemType)); // Output
-                handleItemToClient(wrapper.passthrough(itemType)); // Second Item
+                handleClientboundItem(wrapper); // Input
+                handleClientboundItem(wrapper); // Output
+                handleClientboundItem(wrapper); // Second item
 
                 wrapper.passthrough(Type.BOOLEAN); // Trade disabled
                 wrapper.passthrough(Type.INT); // Number of tools uses
@@ -278,9 +286,9 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
             wrapper.passthrough(Type.VAR_INT); // Container id
             int size = wrapper.passthrough(Type.VAR_INT);
             for (int i = 0; i < size; i++) {
-                handleItemToClient(wrapper.passthrough(itemType)); // Input
-                handleItemToClient(wrapper.passthrough(itemType)); // Output
-                handleItemToClient(wrapper.passthrough(itemType)); // Second Item
+                handleClientboundItem(wrapper); // Input
+                handleClientboundItem(wrapper); // Output
+                handleClientboundItem(wrapper); // Second item
 
                 wrapper.passthrough(Type.BOOLEAN); // Trade disabled
                 wrapper.passthrough(Type.INT); // Number of tools uses
@@ -310,7 +318,7 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
                 if (wrapper.passthrough(Type.BOOLEAN)) {
                     wrapper.passthrough(Type.COMPONENT); // Title
                     wrapper.passthrough(Type.COMPONENT); // Description
-                    handleItemToClient(wrapper.passthrough(itemType)); // Icon
+                    handleClientboundItem(wrapper); // Icon
                     wrapper.passthrough(Type.VAR_INT); // Frame type
                     int flags = wrapper.passthrough(Type.INT); // Flags
                     if ((flags & 1) != 0) {
@@ -354,7 +362,7 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
                 if (wrapper.passthrough(Type.BOOLEAN)) {
                     wrapper.passthrough(componentType); // Title
                     wrapper.passthrough(componentType); // Description
-                    handleItemToClient(wrapper.passthrough(itemType)); // Icon
+                    handleClientboundItem(wrapper); // Icon
                     wrapper.passthrough(Type.VAR_INT); // Frame type
                     int flags = wrapper.passthrough(Type.INT); // Flags
                     if ((flags & 1) != 0) {
@@ -501,7 +509,7 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
                 int data = wrapper.read(Type.VAR_INT);
                 wrapper.write(Type.VAR_INT, protocol.getMappingData().getNewBlockStateId(data));
             } else if (mappings.isItemParticle(id)) {
-                handleItemToClient(wrapper.passthrough(itemType));
+                handleClientboundItem(wrapper);
             }
 
             int mappedId = protocol.getMappingData().getNewParticleId(id);
@@ -528,6 +536,16 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
         return wrapper -> handleItemToServer(wrapper.get(type, 0));
     }
 
+    private void handleClientboundItem(final PacketWrapper wrapper) throws Exception {
+        final Item item = handleItemToClient(wrapper.read(itemType));
+        wrapper.write(mappedItemType, item);
+    }
+
+    private void handleServerboundItem(final PacketWrapper wrapper) throws Exception {
+        final Item item = handleItemToServer(wrapper.read(mappedItemType));
+        wrapper.write(itemType, item);
+    }
+
     protected void rewriteParticle(Particle particle) {
         ParticleMappings mappings = protocol.getMappingData().getParticleMappings();
         int id = particle.getId();

common/src/main/java/com/viaversion/viaversion/rewriter/RecipeRewriter.java

@@ -95,19 +95,23 @@ public class RecipeRewriter<C extends ClientboundPacketType> {
         for (int i = 0; i < ingredientsNo; i++) {
             handleIngredient(wrapper);
         }
-        rewrite(wrapper.passthrough(itemType())); // Result
+
+        final Item result = rewrite(wrapper.read(itemType()));
+        wrapper.write(mappedItemType(), result);
     }
 
     public void handleCraftingShapeless(PacketWrapper wrapper) throws Exception {
         wrapper.passthrough(Type.STRING); // Group
         handleIngredients(wrapper);
-        rewrite(wrapper.passthrough(itemType())); // Result
+        final Item result = rewrite(wrapper.read(itemType()));
+        wrapper.write(mappedItemType(), result);
     }
 
     public void handleSmelting(PacketWrapper wrapper) throws Exception {
         wrapper.passthrough(Type.STRING); // Group
         handleIngredient(wrapper);
-        rewrite(wrapper.passthrough(itemType())); // Result
+        final Item result = rewrite(wrapper.read(itemType()));
+        wrapper.write(mappedItemType(), result);
         wrapper.passthrough(Type.FLOAT); // EXP
         wrapper.passthrough(Type.VAR_INT); // Cooking time
     }
@@ -115,13 +119,15 @@ public class RecipeRewriter<C extends ClientboundPacketType> {
     public void handleStonecutting(PacketWrapper wrapper) throws Exception {
         wrapper.passthrough(Type.STRING); // Group
         handleIngredient(wrapper);
-        rewrite(wrapper.passthrough(itemType())); // Result
+        final Item result = rewrite(wrapper.read(itemType()));
+        wrapper.write(mappedItemType(), result);
     }
 
     public void handleSmithing(PacketWrapper wrapper) throws Exception {
         handleIngredient(wrapper); // Base
         handleIngredient(wrapper); // Addition
-        rewrite(wrapper.passthrough(itemType())); // Result
+        final Item result = rewrite(wrapper.read(itemType()));
+        wrapper.write(mappedItemType(), result);
     }
 
     public void handleSimpleRecipe(final PacketWrapper wrapper) throws Exception {
@@ -132,7 +138,8 @@ public class RecipeRewriter<C extends ClientboundPacketType> {
         handleIngredient(wrapper); // Template
         handleIngredient(wrapper); // Base
         handleIngredient(wrapper); // Additions
-        rewrite(wrapper.passthrough(itemType())); // Result
+        final Item result = rewrite(wrapper.read(itemType()));
+        wrapper.write(mappedItemType(), result);
     }
 
     public void handleSmithingTrim(final PacketWrapper wrapper) throws Exception {
@@ -141,16 +148,19 @@ public class RecipeRewriter<C extends ClientboundPacketType> {
         handleIngredient(wrapper); // Additions
     }
 
-    protected void rewrite(@Nullable Item item) {
+    protected @Nullable Item rewrite(@Nullable Item item) {
         if (protocol.getItemRewriter() != null) {
-            protocol.getItemRewriter().handleItemToClient(item);
+            return protocol.getItemRewriter().handleItemToClient(item);
         }
+        return item;
     }
 
     protected void handleIngredient(final PacketWrapper wrapper) throws Exception {
-        final Item[] items = wrapper.passthrough(itemArrayType());
-        for (final Item item : items) {
-            rewrite(item);
+        final Item[] items = wrapper.read(itemArrayType());
+        wrapper.write(mappedItemArrayType(), items);
+        for (int i = 0; i < items.length; i++) {
+            Item item = items[i];
+            items[i] = rewrite(item);
         }
     }
 
@@ -174,4 +184,12 @@ public class RecipeRewriter<C extends ClientboundPacketType> {
     protected Type<Item[]> itemArrayType() {
         return Type.ITEM1_13_2_ARRAY;
     }
+
+    protected Type<Item> mappedItemType() {
+        return itemType();
+    }
+
+    protected Type<Item[]> mappedItemArrayType() {
+        return itemArrayType();
+    }
 }

gradle.properties

@@ -1,5 +1,5 @@
 # Project properties - we put these here so they can be modified without causing a recompile of the build scripts
-projectVersion=4.10.0-24w07a-SNAPSHOT
+projectVersion=4.10.0-24w09a-SNAPSHOT
 
 # Smile emoji
 mcVersions=1.20.4, 1.20.3, 1.20.2, 1.20.1, 1.20, 1.19.4, 1.19.3, 1.19.2, 1.19.1, 1.19, 1.18.2, 1.18.1, 1.18, 1.17.1, 1.17, 1.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1, 1.16, 1.15.2, 1.15.1, 1.15, 1.14.4, 1.14.3, 1.14.2, 1.14.1, 1.14, 1.13.2, 1.13.1, 1.13, 1.12.2, 1.12.1, 1.12, 1.11.2, 1.11.1, 1.11, 1.10.2, 1.10.1, 1.10, 1.9.4, 1.9.3, 1.9.2, 1.9.1, 1.9, 1.8.9