ViaRewind 4.1.3

Signed-off-by: Florian Reuth <git@florianreuth.de>

.github/workflows/build.yml

@@ -10,13 +10,16 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # 6.0.2
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           persist-credentials: false
       - name: Set up Gradle
-        uses: gradle/actions/setup-gradle@50e97c2cd7a37755bbfafc9c5b7cafaece252f6e # 6.1.0
+        uses: gradle/actions/setup-gradle@3f131e8634966bd73d06cc69884922b02e6faf92 # v6.2.0
+        with:
+          cache-disabled: false
+          cache-provider: basic
       - name: Set up JDK 17
-        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # 5.2.0
+        uses: actions/setup-java@ad2b38190b15e4d6bdf0c97fb4fca8412226d287 # v5.3.0
         with:
           distribution: 'temurin'
           java-version: 17
@@ -24,7 +27,7 @@ jobs:
       - name: Build with Gradle
         run: ./gradlew build
       - name: Upload Artifacts to GitHub
-        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # 7.0.0
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: Artifacts
           path: build/libs/

.github/workflows/publish.yml

@@ -15,13 +15,16 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # 6.0.2
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           persist-credentials: false
       - name: Set up Gradle
-        uses: gradle/actions/setup-gradle@50e97c2cd7a37755bbfafc9c5b7cafaece252f6e # 6.1.0
+        uses: gradle/actions/setup-gradle@3f131e8634966bd73d06cc69884922b02e6faf92 # v6.2.0
+        with:
+          cache-disabled: false
+          cache-provider: basic
       - name: Set up JDK 17
-        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # 5.2.0
+        uses: actions/setup-java@ad2b38190b15e4d6bdf0c97fb4fca8412226d287 # v5.3.0
         with:
           distribution: 'temurin'
           java-version: 17

build.gradle.kts

@@ -24,8 +24,8 @@ allprojects {
 subprojects {
 
     dependencies {
-        compileOnly("com.viaversion:viaversion:5.7.2")
-        compileOnly("com.viaversion:viabackwards:5.7.2")
+        compileOnly("com.viaversion:viaversion:5.11.0")
+        compileOnly("com.viaversion:viabackwards:5.11.0")
     }
 
     tasks {

common/src/main/java/com/viaversion/viarewind/api/compression/ThreadLocalCompressionProvider.java

@@ -0,0 +1,157 @@
+/*
+ * This file is part of ViaRewind - https://github.com/ViaVersion/ViaRewind
+ * Copyright (C) 2018-2026 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viarewind.api.compression;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufAllocator;
+
+import java.util.zip.DataFormatException;
+import java.util.zip.Deflater;
+import java.util.zip.Inflater;
+
+/**
+ * A ThreadLocal-based compression provider that either uses Velocity's native compression
+ * or falls back to Java's built-in compression (Deflater/Inflater).
+ */
+public final class ThreadLocalCompressionProvider {
+
+    private static final boolean VELOCITY_NATIVES_AVAILABLE;
+
+    static {
+        boolean velocityAvailable = false;
+        try {
+            Class.forName("com.velocitypowered.natives.compression.VelocityCompressor");
+            velocityAvailable = true;
+        } catch (final ClassNotFoundException ignored) {
+        }
+        VELOCITY_NATIVES_AVAILABLE = velocityAvailable;
+    }
+
+    // ThreadLocal for Java's Deflater (used when Velocity natives are not available)
+    private static final ThreadLocal<Deflater> JAVA_DEFLATER = ThreadLocal.withInitial(Deflater::new);
+
+    // ThreadLocal for Java's Inflater (used when Velocity natives are not available)
+    private static final ThreadLocal<Inflater> JAVA_INFLATER = ThreadLocal.withInitial(Inflater::new);
+
+    private ThreadLocalCompressionProvider() {
+    }
+
+    /**
+     * Compresses data from the source buffer into the destination buffer.
+     *
+     * @param source      the source buffer containing uncompressed data
+     * @param destination the destination buffer to write compressed data to
+     * @throws DataFormatException if compression fails
+     */
+    public static void deflate(final ByteBuf source, final ByteBuf destination) throws DataFormatException {
+        if (VELOCITY_NATIVES_AVAILABLE) {
+            deflateVelocity(source, destination);
+        } else {
+            deflateJava(source, destination);
+        }
+    }
+
+
+    /**
+     * Decompresses data from the source buffer into the destination buffer.
+     *
+     * @param source        the source buffer containing compressed data
+     * @param destination   the destination buffer to write decompressed data to
+     * @param expectedSize  the expected size of the decompressed data
+     * @throws DataFormatException if decompression fails
+     */
+    public static void inflate(final ByteBuf source, final ByteBuf destination, final int expectedSize) throws DataFormatException {
+        if (VELOCITY_NATIVES_AVAILABLE) {
+            inflateVelocity(source, destination, expectedSize);
+        } else {
+            inflateJava(source, destination, expectedSize);
+        }
+    }
+
+    // Java native implementation
+
+    private static void deflateJava(final ByteBuf source, final ByteBuf destination) throws DataFormatException {
+        ByteBuf temp = source;
+        if (!source.hasArray()) {
+            temp = ByteBufAllocator.DEFAULT.heapBuffer().writeBytes(source);
+        } else {
+            source.retain();
+        }
+        ByteBuf output = ByteBufAllocator.DEFAULT.heapBuffer();
+        try {
+            final Deflater deflater = JAVA_DEFLATER.get();
+            deflater.setInput(temp.array(), temp.arrayOffset() + temp.readerIndex(), temp.readableBytes());
+            deflater.finish();
+
+            while (!deflater.finished()) {
+                output.ensureWritable(4096);
+                output.writerIndex(output.writerIndex() + deflater.deflate(output.array(), output.arrayOffset() + output.writerIndex(), output.writableBytes()));
+            }
+            destination.writeBytes(output);
+        } finally {
+            output.release();
+            temp.release();
+            JAVA_DEFLATER.get().reset();
+        }
+    }
+
+
+    private static void inflateJava(final ByteBuf source, final ByteBuf destination, final int expectedSize) throws DataFormatException {
+        ByteBuf temp = source;
+        if (!source.hasArray()) {
+            temp = ByteBufAllocator.DEFAULT.heapBuffer().writeBytes(source);
+        } else {
+            source.retain();
+        }
+        ByteBuf output = ByteBufAllocator.DEFAULT.heapBuffer(expectedSize, expectedSize);
+        try {
+            final Inflater inflater = JAVA_INFLATER.get();
+            inflater.setInput(temp.array(), temp.arrayOffset() + temp.readerIndex(), temp.readableBytes());
+            output.writerIndex(output.writerIndex() + inflater.inflate(output.array(), output.arrayOffset(), expectedSize));
+            destination.writeBytes(output);
+        } finally {
+            output.release();
+            temp.release();
+            JAVA_INFLATER.get().reset();
+        }
+    }
+
+    // Velocity native implementation
+    private static void deflateVelocity(final ByteBuf source, final ByteBuf destination) throws DataFormatException {
+        VelocityHolder.deflate(source, destination);
+    }
+
+    private static void inflateVelocity(final ByteBuf source, final ByteBuf destination, final int expectedSize) throws DataFormatException {
+        VelocityHolder.inflate(source, destination, expectedSize);
+    }
+
+    private static final class VelocityHolder {
+
+        private static final ThreadLocal<com.velocitypowered.natives.compression.VelocityCompressor> COMPRESSOR =
+                ThreadLocal.withInitial(() -> com.velocitypowered.natives.util.Natives.compress.get().create(-1));
+
+        static void deflate(final ByteBuf source, final ByteBuf destination) throws DataFormatException {
+            COMPRESSOR.get().deflate(source, destination);
+        }
+
+        static void inflate(final ByteBuf source, final ByteBuf destination, final int expectedSize) throws DataFormatException {
+            COMPRESSOR.get().inflate(source, destination, expectedSize);
+        }
+    }
+}
+

common/src/main/java/com/viaversion/viarewind/api/data/RewindMappingData.java

@@ -20,6 +20,10 @@ package com.viaversion.viarewind.api.data;
 import com.viaversion.nbt.tag.CompoundTag;
 import com.viaversion.viabackwards.api.data.BackwardsMappingData;
 import com.viaversion.viarewind.ViaRewind;
+import com.viaversion.viaversion.api.data.FullMappings;
+import com.viaversion.viaversion.api.data.LegacyFullStringMappingsBase;
+import com.viaversion.viaversion.api.data.MappingDataLoader;
+import com.viaversion.viaversion.api.data.Mappings;
 import java.util.logging.Logger;
 
 public class RewindMappingData extends BackwardsMappingData {
@@ -37,4 +41,9 @@ public class RewindMappingData extends BackwardsMappingData {
     protected CompoundTag readMappingsFile(String name) {
         return RewindMappingDataLoader.INSTANCE.loadNBTFromDir(name);
     }
+
+    @Override
+    protected FullMappings createFullMappings(MappingDataLoader.IdentifiersPair identifiersPair, Mappings mappings) {
+        return new LegacyFullStringMappingsBase(identifiersPair, mappings);
+    }
 }

common/src/main/java/com/viaversion/viarewind/api/type/chunk/BulkChunkType1_7_6.java

@@ -17,11 +17,13 @@
  */
 package com.viaversion.viarewind.api.type.chunk;
 
+import com.viaversion.viarewind.api.compression.ThreadLocalCompressionProvider;
 import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
 import com.viaversion.viaversion.api.type.Type;
 import io.netty.buffer.ByteBuf;
 
-import java.util.zip.Deflater;
+import java.util.zip.DataFormatException;
+
 
 public class BulkChunkType1_7_6 extends Type<Chunk[]> {
 
@@ -63,40 +65,47 @@ public class BulkChunkType1_7_6 extends Type<Chunk[]> {
             );
         }
 
-        final byte[] data = new byte[totalSize];
-        int offset = 0;
+        final ByteBuf uncompressed = buffer.alloc().buffer(totalSize);
 
-        for (int i = 0; i < chunkCount; i++) {
-            Chunk chunk = chunks[i];
-            boolean biomes = chunk.isFullChunk() && chunk.getBiomeData() != null;
-
-            offset = ChunkType1_7_6.serialize(
-                chunk,
-                data,
-                offset,
-                addBitMasks[i],
-                anySkyLight,
-                biomes
-            );
-        }
-
-        buffer.writeShort(chunkCount);
-
-        final Deflater deflater = new Deflater();
-        byte[] compressedData;
-        int compressedSize;
         try {
-            deflater.setInput(data, 0, data.length);
-            deflater.finish();
-            compressedData = new byte[data.length];
-            compressedSize = deflater.deflate(compressedData);
-        } finally {
-            deflater.end();
-        }
+            for (int i = 0; i < chunkCount; i++) {
+                Chunk chunk = chunks[i];
+                boolean biomes = chunk.isFullChunk() && chunk.getBiomeData() != null;
 
-        buffer.writeInt(compressedSize);
-        buffer.writeBoolean(anySkyLight);
-        buffer.writeBytes(compressedData, 0, compressedSize);
+                ChunkType1_7_6.serialize(
+                    chunk,
+                    uncompressed,
+                    addBitMasks[i],
+                    anySkyLight,
+                    biomes
+                );
+            }
+
+            buffer.writeShort(chunkCount);
+
+            // Reserve 4 bytes for the compressed size
+            final int sizeIndex = buffer.writerIndex();
+            buffer.writeInt(0); // Placeholder for compressed size
+
+            buffer.writeBoolean(anySkyLight);
+
+            // Write compressed data directly to output buffer
+            final int compressedStart = buffer.writerIndex();
+            try {
+                ThreadLocalCompressionProvider.deflate(uncompressed, buffer);
+            } catch (DataFormatException e) {
+                throw new RuntimeException("Failed to compress bulk chunk data", e);
+            }
+            final int compressedSize = buffer.writerIndex() - compressedStart;
+
+            // Go back and write the compressed size
+            final int endIndex = buffer.writerIndex();
+            buffer.writerIndex(sizeIndex);
+            buffer.writeInt(compressedSize);
+            buffer.writerIndex(endIndex);
+        } finally {
+            uncompressed.release();
+        }
 
         for (int i = 0; i < chunkCount; i++) {
             Chunk chunk = chunks[i];

common/src/main/java/com/viaversion/viarewind/api/type/chunk/ChunkType1_7_6.java

@@ -17,13 +17,15 @@
  */
 package com.viaversion.viarewind.api.type.chunk;
 
+import com.viaversion.viarewind.api.compression.ThreadLocalCompressionProvider;
 import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
 import com.viaversion.viaversion.api.minecraft.chunks.ChunkSection;
 import com.viaversion.viaversion.api.minecraft.chunks.DataPalette;
 import com.viaversion.viaversion.api.minecraft.chunks.PaletteType;
 import com.viaversion.viaversion.api.type.Type;
 import io.netty.buffer.ByteBuf;
-import java.util.zip.Deflater;
+
+import java.util.zip.DataFormatException;
 
 import static com.viaversion.viaversion.api.minecraft.chunks.ChunkSection.SIZE;
 import static com.viaversion.viaversion.api.minecraft.chunks.ChunkSectionLight.LIGHT_LENGTH;
@@ -49,33 +51,41 @@ public class ChunkType1_7_6 extends Type<Chunk> {
         final boolean biomes = chunk.isFullChunk() && chunk.getBiomeData() != null;
 
         final int size = calcSize(bitmask, addBitmask, hasSkyLight, biomes);
-        final byte[] data = new byte[size];
+        final ByteBuf uncompressed = buffer.alloc().buffer(size);
 
-        serialize(chunk, data, 0, addBitmask, hasSkyLight, biomes);
-
-        buffer.writeInt(chunk.getX());
-        buffer.writeInt(chunk.getZ());
-        buffer.writeBoolean(chunk.isFullChunk());
-        buffer.writeShort(bitmask);
-        buffer.writeShort(addBitmask);
-
-        final Deflater deflater = new Deflater();
-        byte[] compressedData;
-        int compressedSize;
         try {
-            deflater.setInput(data, 0, data.length);
-            deflater.finish();
-            compressedData = new byte[data.length];
-            compressedSize = deflater.deflate(compressedData);
-        } finally {
-            deflater.end();
-        }
+            serialize(chunk, uncompressed, addBitmask, hasSkyLight, biomes);
 
-        buffer.writeInt(compressedSize);
-        buffer.writeBytes(compressedData, 0, compressedSize);
+            buffer.writeInt(chunk.getX());
+            buffer.writeInt(chunk.getZ());
+            buffer.writeBoolean(chunk.isFullChunk());
+            buffer.writeShort(bitmask);
+            buffer.writeShort(addBitmask);
+
+            // Reserve 4 bytes for the compressed size
+            final int sizeIndex = buffer.writerIndex();
+            buffer.writeInt(0); // Placeholder for compressed size
+
+            // Write compressed data directly to output buffer
+            final int compressedStart = buffer.writerIndex();
+            try {
+                ThreadLocalCompressionProvider.deflate(uncompressed, buffer);
+            } catch (DataFormatException e) {
+                throw new RuntimeException("Failed to compress chunk data", e);
+            }
+            final int compressedSize = buffer.writerIndex() - compressedStart;
+
+            // Go back and write the compressed size
+            final int endIndex = buffer.writerIndex();
+            buffer.writerIndex(sizeIndex);
+            buffer.writeInt(compressedSize);
+            buffer.writerIndex(endIndex);
+        } finally {
+            uncompressed.release();
+        }
     }
 
-    public static int serialize(Chunk chunk, byte[] output, int offset, int addBitmask, boolean writeSkyLight, boolean biomes) {
+    public static void serialize(Chunk chunk, ByteBuf output, int addBitmask, boolean writeSkyLight, boolean biomes) {
         final ChunkSection[] sections = chunk.getSections();
         final int bitmask = chunk.getBitmask();
 
@@ -85,7 +95,7 @@ public class ChunkType1_7_6 extends Type<Chunk> {
                 final DataPalette palette = section.palette(PaletteType.BLOCKS);
                 for (int j = 0; j < SIZE; j++) {
                     final int block = palette.idAt(j);
-                    output[offset++] = (byte) ((block >> 4) & 0xFF);
+                    output.writeByte((block >> 4) & 0xFF);
                 }
             }
         }
@@ -97,7 +107,7 @@ public class ChunkType1_7_6 extends Type<Chunk> {
                 for (int j = 0; j < ChunkSection.SIZE; j += 2) {
                     final int meta1 = palette.idAt(j) & 0xF;
                     final int meta2 = palette.idAt(j + 1) & 0xF;
-                    output[offset++] = (byte) (meta1 | (meta2 << 4));
+                    output.writeByte(meta1 | (meta2 << 4));
                 }
             }
         }
@@ -105,8 +115,7 @@ public class ChunkType1_7_6 extends Type<Chunk> {
         for (int i = 0; i < 16; i++) {
             if ((bitmask & (1 << i)) != 0) {
                 final byte[] blockLight = sections[i].getLight().getBlockLight();
-                System.arraycopy(blockLight, 0, output, offset, LIGHT_LENGTH);
-                offset += LIGHT_LENGTH;
+                output.writeBytes(blockLight);
             }
         }
 
@@ -115,9 +124,11 @@ public class ChunkType1_7_6 extends Type<Chunk> {
                 if ((bitmask & (1 << i)) != 0) {
                     if (sections[i].getLight().hasSkyLight()) {
                         final byte[] skyLight = sections[i].getLight().getSkyLight();
-                        System.arraycopy(skyLight, 0, output, offset, LIGHT_LENGTH);
+                        output.writeBytes(skyLight);
+                    } else {
+                        // Write empty skylight data
+                        output.writeZero(LIGHT_LENGTH);
                     }
-                    offset += LIGHT_LENGTH;
                 }
             }
         }
@@ -130,7 +141,7 @@ public class ChunkType1_7_6 extends Type<Chunk> {
                     for (int j = 0; j < SIZE; j += 2) {
                         final int add1 = (palette.idAt(j) >> 12) & 0xF;
                         final int add2 = (palette.idAt(j + 1) >> 12) & 0xF;
-                        output[offset++] = (byte) (add1 | (add2 << 4));
+                        output.writeByte(add1 | (add2 << 4));
                     }
                 }
             }
@@ -139,11 +150,9 @@ public class ChunkType1_7_6 extends Type<Chunk> {
         if (biomes && chunk.getBiomeData() != null) {
             final int[] biomeData = chunk.getBiomeData();
             for (int biome : biomeData) {
-                output[offset++] = (byte) biome;
+                output.writeByte(biome);
             }
         }
-
-        return offset;
     }
 
     public static int calcSize(int bitmask, int addBitmask, boolean hasSkyLight, boolean biomes) {

common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/data/ChatNewlineRewriter.java

@@ -26,6 +26,18 @@ import java.util.List;
 import java.util.Map;
 
 public class ChatNewlineRewriter {
+    private static final String[] STYLE_KEYS = {
+            "color",
+            "bold",
+            "italic",
+            "underlined",
+            "strikethrough",
+            "obfuscated",
+            "clickEvent",
+            "hoverEvent",
+            "insertion"
+    };
+
     public static List<JsonObject> splitChatComponentByNewline(JsonElement element) {
         return splitChatComponentByNewline(element, new JsonObject());
     }
@@ -47,8 +59,28 @@ public class ChatNewlineRewriter {
         }
 
         if (element.isJsonArray()) {
+            List<JsonObject> currentLine = new ArrayList<>();
+            JsonObject siblingStyle = inheritedStyle;
+            boolean foundRoot = false;
+
             for (JsonElement child : element.getAsJsonArray()) {
-                results.addAll(splitChatComponentByNewline(child, inheritedStyle));
+                List<JsonObject> splitParts = splitChatComponentByNewline(child, siblingStyle);
+                for (int i = 0; i < splitParts.size(); i++) {
+                    currentLine.add(splitParts.get(i));
+                    if (i < splitParts.size() - 1) {
+                        results.add(mergeLine(currentLine));
+                        currentLine.clear();
+                    }
+                }
+
+                if (!foundRoot && child != null && !child.isJsonNull()) {
+                    siblingStyle = rootStyle(inheritedStyle, child);
+                    foundRoot = true;
+                }
+            }
+
+            if (!currentLine.isEmpty()) {
+                results.add(mergeLine(currentLine));
             }
             return results;
         }
@@ -60,13 +92,7 @@ public class ChatNewlineRewriter {
         JsonObject obj = element.getAsJsonObject();
 
         // Build the style for this node: inherit first, then override with this object's style
-        JsonObject currentStyle = inheritedStyle.deepCopy();
-        for (Map.Entry<String, JsonElement> entry : obj.entrySet()) {
-            String key = entry.getKey();
-            if (!"text".equals(key) && !"extra".equals(key)) {
-                currentStyle.add(key, entry.getValue());
-            }
-        }
+        JsonObject currentStyle = mergeStyle(inheritedStyle, obj);
 
         // Gather components in order: base text then extra array
         List<JsonElement> ordered = new ArrayList<>();
@@ -81,12 +107,19 @@ public class ChatNewlineRewriter {
 
         // If there is no text/extra, return a single object with the style
         if (ordered.isEmpty()) {
-            results.add(currentStyle);
+            JsonObject baseComponent = copyComponentWithoutExtra(obj, currentStyle);
+            results.add(baseComponent != null ? baseComponent : currentStyle);
             return results;
         }
 
         // Build lines by concatenating split pieces
         List<JsonObject> currentLine = new ArrayList<>();
+        if (!obj.has("text")) {
+            JsonObject baseComponent = copyComponentWithoutExtra(obj, currentStyle);
+            if (baseComponent != null) {
+                currentLine.add(baseComponent);
+            }
+        }
         for (JsonElement part : ordered) {
             if (part == null || part.isJsonNull()) {
                 continue;
@@ -127,6 +160,55 @@ public class ChatNewlineRewriter {
         return results;
     }
 
+    private static JsonObject rootStyle(JsonObject inheritedStyle, JsonElement element) {
+        if (element == null || element.isJsonNull()) {
+            return inheritedStyle;
+        }
+        if (element.isJsonObject()) {
+            return mergeStyle(inheritedStyle, element.getAsJsonObject());
+        }
+        if (element.isJsonArray()) {
+            for (JsonElement child : element.getAsJsonArray()) {
+                if (child != null && !child.isJsonNull()) {
+                    return rootStyle(inheritedStyle, child);
+                }
+            }
+        }
+        return inheritedStyle;
+    }
+
+    private static JsonObject mergeStyle(JsonObject inheritedStyle, JsonObject obj) {
+        JsonObject currentStyle = inheritedStyle.deepCopy();
+        for (String key : STYLE_KEYS) {
+            if (obj.has(key)) {
+                currentStyle.add(key, obj.get(key).deepCopy());
+            }
+        }
+        return currentStyle;
+    }
+
+    private static JsonObject copyComponentWithoutExtra(JsonObject obj, JsonObject currentStyle) {
+        JsonObject component = currentStyle.deepCopy();
+        for (Map.Entry<String, JsonElement> entry : obj.entrySet()) {
+            String key = entry.getKey();
+            if ("extra".equals(key) || isStyleKey(key)) {
+                continue;
+            }
+
+            component.add(key, entry.getValue().deepCopy());
+        }
+        return component.size() == currentStyle.size() ? null : component;
+    }
+
+    private static boolean isStyleKey(String key) {
+        for (String styleKey : STYLE_KEYS) {
+            if (styleKey.equals(key)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     private static JsonObject mergeLine(List<JsonObject> lineParts) {
         if (lineParts.isEmpty()) {
             JsonObject empty = new JsonObject();
@@ -139,11 +221,14 @@ public class ChatNewlineRewriter {
             return first;
         }
 
+        JsonObject merged = new JsonObject();
+        merged.addProperty("text", "");
+
         JsonArray extra = new JsonArray();
-        for (int i = 1; i < lineParts.size(); i++) {
-            extra.add(lineParts.get(i));
+        for (JsonObject linePart : lineParts) {
+            extra.add(linePart);
         }
-        first.add("extra", extra);
-        return first;
+        merged.add("extra", extra);
+        return merged;
     }
 }

common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/provider/CompressionHandlerProvider.java

@@ -20,7 +20,6 @@ package com.viaversion.viarewind.protocol.v1_8to1_7_6_10.provider;
 import com.viaversion.viarewind.protocol.v1_8to1_7_6_10.storage.CompressionStatusTracker;
 import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.api.platform.providers.Provider;
-import io.netty.channel.ChannelHandler;
 
 public abstract class CompressionHandlerProvider implements Provider {
 
@@ -28,23 +27,6 @@ public abstract class CompressionHandlerProvider implements Provider {
 
     public abstract void onTransformPacket(UserConnection user);
 
-    /**
-     * Creates the compression encoder
-     *
-     * @param compressor A nullable object that may present a native backend for compression (if available)
-     * @param threshold  The compression threshold
-     * @return The encoder
-     */
-    public abstract ChannelHandler getEncoder(Object compressor, int threshold);
-
-    /**
-     * Creates the compression decoder
-     *
-     * @param compressor A nullable object that may present a native backend for compression (if available)
-     * @param threshold  The compression threshold
-     * @return The decoder
-     */
-    public abstract ChannelHandler getDecoder(Object compressor, int threshold);
 
     public boolean isRemoveCompression(UserConnection user) {
         return user.get(CompressionStatusTracker.class).removeCompression;

common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/provider/compression/CompressionDecoder.java

@@ -17,18 +17,15 @@
  */
 package com.viaversion.viarewind.protocol.v1_8to1_7_6_10.provider.compression;
 
+import com.viaversion.viarewind.api.compression.ThreadLocalCompressionProvider;
 import com.viaversion.viaversion.api.type.Types;
 import io.netty.buffer.ByteBuf;
-import io.netty.buffer.ByteBufAllocator;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.DecoderException;
 import io.netty.handler.codec.MessageToMessageDecoder;
 import java.util.List;
-import java.util.zip.DataFormatException;
-import java.util.zip.Inflater;
 
 public class CompressionDecoder extends MessageToMessageDecoder<ByteBuf> {
-    private final Inflater inflater = new Inflater();
 
     private int threshold;
 
@@ -58,25 +55,12 @@ public class CompressionDecoder extends MessageToMessageDecoder<ByteBuf> {
             throw new DecoderException("Badly compressed packet - size of " + outLength + " is larger than protocol maximum of " + 2097152);
         }
 
-        inflate(ctx, in, outLength, out);
-    }
-
-    protected void inflate(final ChannelHandlerContext ctx, final ByteBuf source, final int outLength, final List<Object> out) throws DataFormatException {
-        ByteBuf temp = source;
-        if (!source.hasArray()) {
-            temp = ByteBufAllocator.DEFAULT.heapBuffer().writeBytes(source);
-        } else {
-            source.retain();
-        }
-        ByteBuf output = ByteBufAllocator.DEFAULT.heapBuffer(outLength, outLength);
+        ByteBuf output = ctx.alloc().buffer(outLength);
         try {
-            this.inflater.setInput(temp.array(), temp.arrayOffset() + temp.readerIndex(), temp.readableBytes());
-            output.writerIndex(output.writerIndex() + this.inflater.inflate(output.array(), output.arrayOffset(), outLength));
+            ThreadLocalCompressionProvider.inflate(in, output, outLength);
             out.add(output.retain());
         } finally {
             output.release();
-            temp.release();
-            this.inflater.reset();
         }
     }
 

common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/provider/compression/CompressionEncoder.java

@@ -17,16 +17,13 @@
  */
 package com.viaversion.viarewind.protocol.v1_8to1_7_6_10.provider.compression;
 
+import com.viaversion.viarewind.api.compression.ThreadLocalCompressionProvider;
 import com.viaversion.viaversion.api.type.Types;
 import io.netty.buffer.ByteBuf;
-import io.netty.buffer.ByteBufAllocator;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.MessageToByteEncoder;
-import java.util.zip.DataFormatException;
-import java.util.zip.Deflater;
 
 public class CompressionEncoder extends MessageToByteEncoder<ByteBuf> {
-    private final Deflater deflater = new Deflater();
 
     private int threshold;
 
@@ -48,32 +45,7 @@ public class CompressionEncoder extends MessageToByteEncoder<ByteBuf> {
         }
 
         Types.VAR_INT.writePrimitive(out, frameLength);
-
-        deflate(in, out);
-    }
-
-    protected void deflate(final ByteBuf source, final ByteBuf destination) throws DataFormatException {
-        ByteBuf temp = source;
-        if (!source.hasArray()) {
-            temp = ByteBufAllocator.DEFAULT.heapBuffer().writeBytes(source);
-        } else {
-            source.retain();
-        }
-        ByteBuf output = ByteBufAllocator.DEFAULT.heapBuffer();
-        try {
-            this.deflater.setInput(temp.array(), temp.arrayOffset() + temp.readerIndex(), temp.readableBytes());
-            deflater.finish();
-
-            while (!deflater.finished()) {
-                output.ensureWritable(4096);
-                output.writerIndex(output.writerIndex() + this.deflater.deflate(output.array(), output.arrayOffset() + output.writerIndex(), output.writableBytes()));
-            }
-            destination.writeBytes(output);
-        } finally {
-            output.release();
-            temp.release();
-            this.deflater.reset();
-        }
+        ThreadLocalCompressionProvider.deflate(in, out);
     }
 
 }

common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/provider/compression/TrackingCompressionHandlerProvider.java

@@ -21,28 +21,12 @@ import com.viaversion.viarewind.ViaRewind;
 import com.viaversion.viarewind.api.minecraft.netty.EmptyChannelHandler;
 import com.viaversion.viarewind.api.minecraft.netty.ForwardMessageToByteEncoder;
 import com.viaversion.viarewind.protocol.v1_8to1_7_6_10.provider.CompressionHandlerProvider;
-import com.viaversion.viarewind.protocol.v1_8to1_7_6_10.provider.compression.velocity.VelocityCompressionDecoder;
-import com.viaversion.viarewind.protocol.v1_8to1_7_6_10.provider.compression.velocity.VelocityCompressionEncoder;
 import com.viaversion.viaversion.api.Via;
 import com.viaversion.viaversion.api.connection.UserConnection;
-import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelPipeline;
 
 public class TrackingCompressionHandlerProvider extends CompressionHandlerProvider {
 
-    // Use Velocity's compression backend if ViaRewind is loaded on a Velocity server or a custom server software
-    // is shipping them in the classpath.
-    private static boolean velocityNatives;
-
-    static {
-        try {
-            Class.forName("com.velocitypowered.natives.compression.VelocityCompressor");
-            velocityNatives = true;
-        } catch (final ClassNotFoundException ignored) {
-            velocityNatives = false;
-        }
-    }
-
     @Override
     public void setCompressionThreshold(UserConnection user, int threshold) {
         final ChannelPipeline pipeline = user.getChannel().pipeline();
@@ -51,17 +35,12 @@ public class TrackingCompressionHandlerProvider extends CompressionHandlerProvid
             return;
         }
 
-        Object compressor = null;
-        if (velocityNatives) {
-            compressor = com.velocitypowered.natives.util.Natives.compress.get().create(-1);
-        }
-
         final String compressHandlerName = ViaRewind.getPlatform().compressHandlerName();
         final CompressionEncoder encoder = (CompressionEncoder) pipeline.get(compressHandlerName);
         if (encoder != null) {
             encoder.setThreshold(threshold);
         } else {
-            pipeline.addBefore(Via.getManager().getInjector().getEncoderName(), compressHandlerName, getEncoder(compressor, threshold));
+            pipeline.addBefore(Via.getManager().getInjector().getEncoderName(), compressHandlerName, new CompressionEncoder(threshold));
         }
 
         final String decompressHandlerName = ViaRewind.getPlatform().decompressHandlerName();
@@ -69,7 +48,7 @@ public class TrackingCompressionHandlerProvider extends CompressionHandlerProvid
         if (decoder != null) {
             decoder.setThreshold(threshold);
         } else {
-            pipeline.addBefore(Via.getManager().getInjector().getDecoderName(), decompressHandlerName, getDecoder(compressor, threshold));
+            pipeline.addBefore(Via.getManager().getInjector().getDecoderName(), decompressHandlerName, new CompressionDecoder(threshold));
         }
     }
 
@@ -96,22 +75,5 @@ public class TrackingCompressionHandlerProvider extends CompressionHandlerProvid
         }
     }
 
-    @Override
-    public ChannelHandler getEncoder(final Object compressor, int threshold) {
-        if (velocityNatives) {
-            return new VelocityCompressionEncoder(threshold, (com.velocitypowered.natives.compression.VelocityCompressor) compressor);
-        } else {
-            return new CompressionEncoder(threshold);
-        }
-    }
-
-    @Override
-    public ChannelHandler getDecoder(final Object compressor, int threshold) {
-        if (velocityNatives) {
-            return new VelocityCompressionDecoder(threshold, (com.velocitypowered.natives.compression.VelocityCompressor) compressor);
-        } else {
-            return new CompressionDecoder(threshold);
-        }
-    }
 
 }

common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/provider/compression/velocity/VelocityCompressionDecoder.java

@@ -1,47 +0,0 @@
-/*
- * This file is part of ViaRewind - https://github.com/ViaVersion/ViaRewind
- * Copyright (C) 2018-2026 ViaVersion and contributors
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package com.viaversion.viarewind.protocol.v1_8to1_7_6_10.provider.compression.velocity;
-
-import com.velocitypowered.natives.compression.VelocityCompressor;
-import com.viaversion.viarewind.protocol.v1_8to1_7_6_10.provider.compression.CompressionDecoder;
-import io.netty.buffer.ByteBuf;
-import io.netty.channel.ChannelHandlerContext;
-import java.util.List;
-import java.util.zip.DataFormatException;
-
-public final class VelocityCompressionDecoder extends CompressionDecoder {
-
-    private final VelocityCompressor compressor;
-
-    public VelocityCompressionDecoder(final int threshold, final VelocityCompressor compressor) {
-        super(threshold);
-        this.compressor = compressor;
-    }
-
-    @Override
-    protected void inflate(final ChannelHandlerContext ctx, final ByteBuf source, final int outLength, final List<Object> out) throws DataFormatException {
-        ByteBuf output = ctx.alloc().buffer(outLength);
-        try {
-            this.compressor.inflate(source, output, outLength);
-            out.add(output.retain());
-        } finally {
-            output.release();
-        }
-    }
-
-}

common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/provider/compression/velocity/VelocityCompressionEncoder.java

@@ -1,39 +0,0 @@
-/*
- * This file is part of ViaRewind - https://github.com/ViaVersion/ViaRewind
- * Copyright (C) 2018-2026 ViaVersion and contributors
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package com.viaversion.viarewind.protocol.v1_8to1_7_6_10.provider.compression.velocity;
-
-import com.velocitypowered.natives.compression.VelocityCompressor;
-import com.viaversion.viarewind.protocol.v1_8to1_7_6_10.provider.compression.CompressionEncoder;
-import io.netty.buffer.ByteBuf;
-import java.util.zip.DataFormatException;
-
-public final class VelocityCompressionEncoder extends CompressionEncoder {
-
-    private final VelocityCompressor compressor;
-
-    public VelocityCompressionEncoder(final int threshold, final VelocityCompressor compressor) {
-        super(threshold);
-        this.compressor = compressor;
-    }
-
-    @Override
-    protected void deflate(final ByteBuf source, final ByteBuf destination) throws DataFormatException {
-        this.compressor.deflate(source, destination);
-    }
-
-}

common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/rewriter/PlayerPacketRewriter1_8.java

@@ -48,6 +48,7 @@ import com.viaversion.viaversion.api.rewriter.RewriterBase;
 import com.viaversion.viaversion.api.type.Types;
 import com.viaversion.viaversion.libs.gson.JsonElement;
 import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.libs.gson.JsonPrimitive;
 import com.viaversion.viaversion.protocols.v1_8to1_9.packet.ClientboundPackets1_8;
 import com.viaversion.viaversion.protocols.v1_8to1_9.packet.ServerboundPackets1_8;
 import com.viaversion.viaversion.util.ComponentUtil;
@@ -511,7 +512,13 @@ public class PlayerPacketRewriter1_8 extends RewriterBase<Protocol1_8To1_7_6_10>
                 String username = message.split(" ")[1];
                 final GameProfileStorage storage = wrapper.user().get(GameProfileStorage.class);
 
-                final GameProfileStorage.GameProfile profile = storage.get(username, true);
+                // Multiple players with the same name may exist. This will only represent
+                // fake players so it's fine to just pick the first one.
+                List<GameProfileStorage.GameProfile> profiles = storage.get(username, true);
+                if (profiles.isEmpty()) {
+                    return;
+                }
+                final GameProfileStorage.GameProfile profile = profiles.get(0);
                 if (profile != null && profile.uuid != null) {
                     wrapper.cancel();
 
@@ -529,9 +536,6 @@ public class PlayerPacketRewriter1_8 extends RewriterBase<Protocol1_8To1_7_6_10>
                 map(Types.BYTE, Types.VAR_INT); // Mode
                 handler(wrapper -> {
                     final int mode = wrapper.get(Types.VAR_INT, 1);
-                    if (mode != 0) {
-                        return;
-                    }
                     final EntityTracker1_8 tracker = wrapper.user().getEntityTracker(Protocol1_8To1_7_6_10.class);
                     final int entityId = tracker.getHologramIdWithExtra(wrapper.get(Types.VAR_INT, 0));
                     final PlayerSessionStorage position = wrapper.user().get(PlayerSessionStorage.class);
@@ -541,6 +545,11 @@ public class PlayerPacketRewriter1_8 extends RewriterBase<Protocol1_8To1_7_6_10>
                     }
 
                     wrapper.set(Types.VAR_INT, 0, entityId);
+
+                    if (mode != 0) {
+                        return;
+                    }
+
                     final AABB boundingBox = tracker.getHolograms().get(entityId).getBoundingBox();
 
                     Vector3d pos = new Vector3d(position.getPosX(), position.getPosY() + 1.8, position.getPosZ());
@@ -608,6 +617,16 @@ public class PlayerPacketRewriter1_8 extends RewriterBase<Protocol1_8To1_7_6_10>
             protected void register() {
                 map(Types.VAR_INT); // Status
                 map(RewindTypes.U_BYTE_POSITION, Types.BLOCK_POSITION1_8); // Position
+                handler(wrapper -> {
+                    // 1.7 uses 255 as "no face"
+                    // 1.8 changed this to only be in the range EnumFacing range (0-5) and uses DOWN when no face is used
+                    // This properly rewrites invalid values to the 1.8 equivalent
+                    int face = wrapper.read(Types.UNSIGNED_BYTE);
+                    if (face > 5) {
+                        face = 0;
+                    }
+                    wrapper.write(Types.UNSIGNED_BYTE, (short) face);
+                });
             }
         });
 
@@ -770,6 +789,8 @@ public class PlayerPacketRewriter1_8 extends RewriterBase<Protocol1_8To1_7_6_10>
             }
         });
 
+        // 1.7.10 custom payload constructor (String, ByteBuf) uses byteBuf.array(), so it sends the whole backing array capacity, not only the written bytes
+        // After reading the proper packet data we discard the remaining bytes
         protocol.registerServerbound(ServerboundPackets1_7_2_5.CUSTOM_PAYLOAD, new PacketHandlers() {
             @Override
             public void register() {
@@ -780,7 +801,27 @@ public class PlayerPacketRewriter1_8 extends RewriterBase<Protocol1_8To1_7_6_10>
                     switch (channel) {
                         case "MC|TrSel": {
                             wrapper.passthrough(Types.INT);
-                            wrapper.read(Types.REMAINING_BYTES); // unused data ???
+                            wrapper.read(Types.REMAINING_BYTES); // Discard remaining bytes
+                            break;
+                        }
+                        case "MC|AdvCdm": {
+                            final byte commandBlockType = wrapper.passthrough(Types.BYTE);
+                            if (commandBlockType == 0) { // Block
+                                wrapper.passthrough(Types.INT); // X
+                                wrapper.passthrough(Types.INT); // Y
+                                wrapper.passthrough(Types.INT); // Z
+                            } else if (commandBlockType == 1) { // Minecart
+                                wrapper.passthrough(Types.INT); // Entity id
+                            }
+                            wrapper.passthrough(Types.STRING); // Command
+                            wrapper.write(Types.BOOLEAN, true); // Track output, added in 1.8, default to true
+                            wrapper.read(Types.REMAINING_BYTES); // Discard remaining bytes
+                            break;
+                        }
+                        case "MC|Beacon": {
+                            wrapper.passthrough(Types.INT); // Primary effect
+                            wrapper.passthrough(Types.INT); // Secondary effect
+                            wrapper.read(Types.REMAINING_BYTES); // Discard remaining bytes
                             break;
                         }
                         case "MC|ItemName": {
@@ -797,17 +838,28 @@ public class PlayerPacketRewriter1_8 extends RewriterBase<Protocol1_8To1_7_6_10>
                         }
                         case "MC|BEdit":
                         case "MC|BSign": {
+                            final boolean signBook = channel.equals("MC|BSign");
                             final Item book = wrapper.read(RewindTypes.COMPRESSED_NBT_ITEM);
-                            CompoundTag tag = book.tag();
-                            if (tag != null && tag.contains("pages")) {
-                                ListTag<StringTag> pages = tag.getListTag("pages", StringTag.class);
-                                for (int i = 0; i < pages.size(); i++) {
-                                    StringTag page = pages.get(i);
-                                    String value = page.getValue();
-                                    value = ComponentUtil.legacyToJsonString(value);
-                                    page.setValue(value);
+                            wrapper.read(Types.REMAINING_BYTES); // Discard remaining bytes
+
+                            if (book == null) {
+                                wrapper.write(Types.ITEM1_8, null);
+                                break;
+                            }
+
+                            final CompoundTag tag = book.tag();
+                            if (signBook && tag != null && tag.contains("pages")) {
+                                final ListTag<StringTag> pages = tag.getListTag("pages", StringTag.class);
+                                if (pages != null) {
+                                    for (int i = 0; i < pages.size(); i++) {
+                                        final StringTag page = pages.get(i);
+                                        String value = page.getValue();
+                                        value = new JsonPrimitive(value).toString();
+                                        page.setValue(value);
+                                    }
                                 }
                             }
+                            protocol.getItemRewriter().handleItemToServer(wrapper.user(), book);
                             wrapper.write(Types.ITEM1_8, book);
                             break;
                         }

common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/storage/EntityTracker1_8.java

@@ -22,6 +22,7 @@ import com.viaversion.viarewind.protocol.v1_7_6_10to1_7_2_5.packet.ServerboundPa
 import com.viaversion.viarewind.protocol.v1_8to1_7_6_10.Protocol1_8To1_7_6_10;
 import com.viaversion.viarewind.protocol.v1_8to1_7_6_10.data.VirtualHologramEntity;
 import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.data.entity.TrackedEntity;
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_8;
 import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
@@ -68,17 +69,15 @@ public class EntityTracker1_8 extends EntityTrackerBase {
     }
 
     @Override
-    public void addEntity(int id, EntityType type) {
-        super.addEntity(id, type);
+    public TrackedEntity addEntity(int id, EntityType type) {
         if (type == EntityTypes1_8.EntityType.ARMOR_STAND) {
             holograms.put(id, new VirtualHologramEntity(user(), id));
         }
+        return super.addEntity(id, type);
     }
 
     @Override
-    public void removeEntity(int entityId) {
-        super.removeEntity(entityId);
-
+    public TrackedEntity removeEntity(int entityId) {
         final VirtualHologramEntity hologram = holograms.get(entityId);
         if (hologram != null) {
             hologram.deleteEntity();
@@ -95,6 +94,7 @@ public class EntityTracker1_8 extends EntityTrackerBase {
             entityUUIDToId.removeInt(playerId);
             user().get(PlayerSessionStorage.class).getPlayerEquipment().remove(playerId);
         }
+        return super.removeEntity(entityId);
     }
 
     @Override
@@ -222,17 +222,16 @@ public class EntityTracker1_8 extends EntityTrackerBase {
 
     public void checkNametagVisbility(final String username) {
         final GameProfileStorage profileStorage = user().get(GameProfileStorage.class);
-        final GameProfileStorage.GameProfile profile = profileStorage.get(username, false);
-        if (profile == null) {
-            return;
-        }
+        final List<GameProfileStorage.GameProfile> profiles = profileStorage.get(username, false);
 
-        final int entityId = getPlayerEntityId(profile.uuid);
-        if (entityId == -1) {
-            return;
-        }
+        for (GameProfileStorage.GameProfile profile : profiles) {
+            final int entityId = getPlayerEntityId(profile.uuid);
+            if (entityId == -1) {
+                return;
+            }
 
-        checkNametagVisibility(entityId);
+            checkNametagVisibility(entityId);
+        }
     }
 
     private boolean isPlayerNametagHidden(final int entityId) {

common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/storage/GameProfileStorage.java

@@ -17,6 +17,10 @@
  */
 package com.viaversion.viarewind.protocol.v1_8to1_7_6_10.storage;
 
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.ListMultimap;
+import com.google.common.collect.Multimap;
 import com.viaversion.nbt.tag.CompoundTag;
 import com.viaversion.nbt.tag.ListTag;
 import com.viaversion.nbt.tag.StringTag;
@@ -34,6 +38,7 @@ import java.util.UUID;
 
 public class GameProfileStorage extends StoredObject {
     private final Map<UUID, GameProfile> properties = new HashMap<>();
+    private final ListMultimap<String, GameProfile> nameToProfile = ArrayListMultimap.create();
 
     public GameProfileStorage(UserConnection user) {
         super(user);
@@ -42,6 +47,7 @@ public class GameProfileStorage extends StoredObject {
     public GameProfile put(UUID uuid, String name, String displayName, int ping, int gamemode) {
         GameProfile gameProfile = new GameProfile(uuid, name, displayName, ping, gamemode);
         properties.put(uuid, gameProfile);
+        nameToProfile.put(name, gameProfile);
         return gameProfile;
     }
 
@@ -49,19 +55,9 @@ public class GameProfileStorage extends StoredObject {
         return properties.get(uuid);
     }
 
-    public GameProfile get(String name, boolean ignoreCase) {
+    public List<GameProfile> get(String name, boolean ignoreCase) {
         if (ignoreCase) name = name.toLowerCase();
-
-        for (GameProfile profile : properties.values()) {
-            if (profile.name == null) continue;
-
-            String n = ignoreCase ? profile.name.toLowerCase() : profile.name;
-
-            if (n.equals(name)) {
-                return profile;
-            }
-        }
-        return null;
+        return nameToProfile.get(name);
     }
 
     public List<GameProfile> getAllWithPrefix(String prefix, boolean ignoreCase) {
@@ -81,7 +77,11 @@ public class GameProfileStorage extends StoredObject {
     }
 
     public GameProfile remove(UUID uuid) {
-        return properties.remove(uuid);
+        GameProfile removedProfile = properties.remove(uuid);
+        if (removedProfile != null) {
+            nameToProfile.get(removedProfile.name).remove(removedProfile);
+        }
+        return removedProfile;
     }
 
 

common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/storage/ScoreboardTracker.java

@@ -140,37 +140,43 @@ public class ScoreboardTracker extends StoredObject {
     public String sendTeamForScore(String score) {
         if (score.length() <= 16) return score;
         if (scoreTeams.containsKey(score)) return scoreTeams.get(score).name;
-        int l = 16;
-        int i = Math.min(16, score.length() - 16);
-        String name = score.substring(i, i + l);
-        while (scoreTeamNames.contains(name) || teams.containsKey(name)) {
-            i--;
-            while (score.length() - l - i > 16) {
-                l--;
-                if (l < 1) return score;
-                i = Math.min(16, score.length() - l);
+
+        // Find the longest window score[i, i+l) that:
+        // - is not already claimed as a team name
+        // - keeps prefix (score[0,i)) at most 16 chars i <= 16
+        // - keeps suffix (score[i+l, end)) at most 16 chars score.length()-l-i <= 16
+        for (int l = 16; l >= 1; l--) {
+            final int iMax = Math.min(16, score.length() - l);
+            final int iMin = Math.max(0, score.length() - l - 16);
+            for (int i = iMax; i >= iMin; i--) {
+                final String name = score.substring(i, i + l);
+                if (scoreTeamNames.contains(name) || teams.containsKey(name)) {
+                    continue;
+                }
+
+                final String prefix = score.substring(0, i);
+                final String suffix = i + l >= score.length() ? "" : score.substring(i + l);
+
+                final ScoreTeam scoreTeam = new ScoreTeam(name, prefix, suffix);
+                scoreTeams.put(score, scoreTeam);
+                scoreTeamNames.add(name);
+
+                final PacketWrapper teamPacket = PacketWrapper.create(ClientboundPackets1_7_2_5.SET_PLAYER_TEAM, getUser());
+                teamPacket.write(Types.STRING, name);
+                teamPacket.write(Types.BYTE, (byte) 0);
+                teamPacket.write(Types.STRING, "ViaRewind");
+                teamPacket.write(Types.STRING, prefix);
+                teamPacket.write(Types.STRING, suffix);
+                teamPacket.write(Types.BYTE, (byte) 0);
+                teamPacket.write(Types.SHORT, (short) 1);
+                teamPacket.write(Types.STRING, name);
+                teamPacket.send(Protocol1_8To1_7_6_10.class);
+
+                return name;
             }
-            name = score.substring(i, i + l);
         }
-        String prefix = score.substring(0, i);
-        String suffix = i + l >= score.length() ? "" : score.substring(i + l);
 
-        ScoreTeam scoreTeam = new ScoreTeam(name, prefix, suffix);
-        scoreTeams.put(score, scoreTeam);
-        scoreTeamNames.add(name);
-
-        PacketWrapper teamPacket = PacketWrapper.create(ClientboundPackets1_7_2_5.SET_PLAYER_TEAM, getUser());
-        teamPacket.write(Types.STRING, name);
-        teamPacket.write(Types.BYTE, (byte) 0);
-        teamPacket.write(Types.STRING, "ViaRewind");
-        teamPacket.write(Types.STRING, prefix);
-        teamPacket.write(Types.STRING, suffix);
-        teamPacket.write(Types.BYTE, (byte) 0);
-        teamPacket.write(Types.SHORT, (short) 1);
-        teamPacket.write(Types.STRING, name);
-        teamPacket.send(Protocol1_8To1_7_6_10.class);
-
-        return name;
+        return score;
     }
 
     public String removeTeamForScore(String score) {

common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/task/WorldBorderUpdateTask.java

@@ -35,6 +35,9 @@ public class WorldBorderUpdateTask implements Runnable {
     public void run() {
         for (UserConnection connection : Via.getManager().getConnectionManager().getConnections()) {
             final WorldBorderEmulator worldBorderEmulatorTracker = connection.get(WorldBorderEmulator.class);
+            if (worldBorderEmulatorTracker == null) {
+                continue;
+            }
             if (!worldBorderEmulatorTracker.isInit()) continue;
 
             final PlayerSessionStorage playerSession = connection.get(PlayerSessionStorage.class);

common/src/main/java/com/viaversion/viarewind/protocol/v1_9to1_8/rewriter/BlockItemPacketRewriter1_9.java

@@ -19,6 +19,7 @@ package com.viaversion.viarewind.protocol.v1_9to1_8.rewriter;
 
 import com.viaversion.nbt.tag.ByteTag;
 import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.IntTag;
 import com.viaversion.nbt.tag.ListTag;
 import com.viaversion.nbt.tag.StringTag;
 import com.viaversion.nbt.tag.Tag;
@@ -194,6 +195,7 @@ public class BlockItemPacketRewriter1_9 extends VRBlockItemRewriter<ClientboundP
     @Override
     public Item handleItemToClient(UserConnection connection, Item item) {
         if (item == null) return null;
+        final int originalId = item.identifier();
         super.handleItemToClient(connection, item);
 
         CompoundTag tag = item.tag();
@@ -280,6 +282,32 @@ public class BlockItemPacketRewriter1_9 extends VRBlockItemRewriter<ClientboundP
             });
         }
 
+        // Colors the fake leather armor for an elytra gray
+        if (originalId == 443) {
+            if (tag == null) {
+                item.setTag(tag = new CompoundTag());
+            }
+            CompoundTag display = tag.getCompoundTag("display");
+            if (display == null) {
+                tag.put("display", display = new CompoundTag());
+            }
+            display.put("color", new IntTag(0x737373)); // Gray
+            tag.put(nbtTagName() + "|noDisplay", new ByteTag(true));
+        }
+
+        // Makes the fake banner for a shield brown if it has no banner patterns
+        if (originalId == 442) {
+            final CompoundTag blockEntityTag = tag == null ? null : tag.getCompoundTag("BlockEntityTag");
+            final ListTag<CompoundTag> patterns = blockEntityTag == null ? null : blockEntityTag.getListTag("Patterns", CompoundTag.class);
+            if (patterns == null || patterns.isEmpty()) {
+                item.setData((short) 3); // Brown
+                if (tag == null) {
+                    item.setTag(tag = new CompoundTag());
+                }
+                tag.put(nbtTagName() + "|noData", new ByteTag(true));
+            }
+        }
+
         return item;
     }
 
@@ -322,6 +350,9 @@ public class BlockItemPacketRewriter1_9 extends VRBlockItemRewriter<ClientboundP
         if (tag == null) {
             return item;
         }
+        if (tag.remove(nbtTagName() + "|noData") != null) {
+            item.setData((short) 0);
+        }
         final Tag noDisplayTag = tag.remove(nbtTagName() + "|noDisplay");
         if (noDisplayTag != null) {
             tag.remove("display");

common/src/main/java/com/viaversion/viarewind/protocol/v1_9to1_8/rewriter/PlayerPacketRewriter1_9.java

@@ -334,7 +334,12 @@ public class PlayerPacketRewriter1_9 extends RewriterBase<Protocol1_9To1_8> {
             final PlayerPositionTracker storage = wrapper.user().get(PlayerPositionTracker.class);
             storage.sendAnimations();
             if (storage.getConfirmId() != -1) {
-                if (storage.getPosX() == x && storage.getPosY() == y && storage.getPosZ() == z && storage.getYaw() == yaw && storage.getPitch() == pitch) {
+                // 1.7 uses resynced hitbox minY for y however this can have small floating point error due to the calculations it does to get there on teleport confirm
+                // This Y error gets propagated from 1.7 to 1.8 to 1.9 which causes teleport confirmation to not properly be detected
+                // This fixes it similarly to how anticheats detect teleports: https://github.com/GrimAnticheat/Grim/blob/67aa3a9483a9b2a6987d594092697b4104c781f0/common/src/main/java/ac/grim/grimac/manager/SetbackTeleportUtil.java#L315
+                boolean closeEnoughY = Math.abs(storage.getPosY() - y) <= 1e-7;
+
+                if (storage.getPosX() == x && closeEnoughY && storage.getPosZ() == z && storage.getYaw() == yaw && storage.getPitch() == pitch) {
                     final PacketWrapper confirmTeleport = PacketWrapper.create(ServerboundPackets1_9.ACCEPT_TELEPORTATION, wrapper.user());
                     confirmTeleport.write(Types.VAR_INT, storage.getConfirmId());
                     confirmTeleport.sendToServer(Protocol1_9To1_8.class);

common/src/main/java/com/viaversion/viarewind/protocol/v1_9to1_8/rewriter/WorldPacketRewriter1_9.java

@@ -92,9 +92,12 @@ public class WorldPacketRewriter1_9 extends RewriterBase<Protocol1_9To1_8> {
                     String name = wrapper.get(Types.STRING, 0);
                     name = protocol.getMappingData().getMappedNamedSound(name);
                     if (name == null) {
-                        wrapper.cancel();
-                    } else {
+                        return;
+                    }
+                    if (!name.isEmpty()) {
                         wrapper.set(Types.STRING, 0, name);
+                    } else {
+                        wrapper.cancel();
                     }
                 });
                 read(Types.VAR_INT); // Sound category

common/src/main/java/com/viaversion/viarewind/protocol/v1_9to1_8/storage/EntityTracker1_9.java

@@ -18,6 +18,7 @@
 package com.viaversion.viarewind.protocol.v1_9to1_8.storage;
 
 import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.data.entity.TrackedEntity;
 import com.viaversion.viaversion.api.minecraft.Vector;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_9;
 import com.viaversion.viaversion.data.entity.EntityTrackerBase;
@@ -41,14 +42,14 @@ public class EntityTracker1_9 extends EntityTrackerBase {
     }
 
     @Override
-    public void removeEntity(int id) {
+    public TrackedEntity removeEntity(int id) {
         vehicles.remove(id);
         offsets.remove(id);
         status.remove(id);
 
         vehicles.forEach((vehicle, passengers) -> passengers.rem(id));
         vehicles.int2ObjectEntrySet().removeIf(entry -> entry.getValue().isEmpty());
-        super.removeEntity(id);
+        return super.removeEntity(id);
     }
 
     public void resetEntityOffset(final int id) {

common/src/main/java/com/viaversion/viarewind/protocol/v1_9to1_8/storage/WindowTracker.java

@@ -52,11 +52,11 @@ public class WindowTracker extends StoredObject {
         openWindow.write(Types.UNSIGNED_BYTE, windowId);
         openWindow.write(Types.STRING, "minecraft:brewing_stand");
 
-        TextComponent title = new StringComponent().
-            append(new TranslationComponent("container.brewing")).
-            append(new StringComponent(": " + TextFormatting.DARK_GRAY)).
-            append(new StringComponent(amount + " " + TextFormatting.DARK_RED)).
-            append(new TranslationComponent("item.blazePowder.name", TextFormatting.DARK_RED));
+        TextComponent title = new StringComponent()
+            .append(new TranslationComponent("container.brewing"))
+            .append(new StringComponent(": ").formatted(TextFormatting.DARK_GRAY))
+            .append(new StringComponent(amount + " ").formatted(TextFormatting.DARK_RED))
+            .append(new TranslationComponent("item.blazePowder.name").formatted(TextFormatting.DARK_RED));
 
         openWindow.write(Types.COMPONENT, TextComponentSerializer.V1_8.serializeJson(title));
         openWindow.write(Types.UNSIGNED_BYTE, (short) 420);

common/src/main/java/com/viaversion/viarewind/protocol/v1_9to1_8/task/CooldownIndicatorTask.java

@@ -26,7 +26,11 @@ public class CooldownIndicatorTask implements Runnable {
     @Override
     public void run() {
         for (UserConnection connection : Via.getManager().getConnectionManager().getConnections()) {
-            connection.get(CooldownStorage.class).tick(connection);
+            final CooldownStorage cooldown = connection.get(CooldownStorage.class);
+            if (cooldown == null) {
+                continue;
+            }
+            cooldown.tick(connection);
         }
     }
 }

common/src/main/java/com/viaversion/viarewind/protocol/v1_9to1_8/task/LevitationUpdateTask.java

@@ -36,6 +36,9 @@ public class LevitationUpdateTask implements Runnable {
         }
         for (UserConnection connection : Via.getManager().getConnectionManager().getConnections()) {
             final LevitationStorage levitation = connection.get(LevitationStorage.class);
+            if (levitation == null) {
+                continue;
+            }
             if (!levitation.isActive()) {
                 continue;
             }

fabric/src/main/resources/fabric.mod.json

@@ -24,7 +24,7 @@
   },
   "depends": {
     "viafabric": ">=0.4.14",
-    "viabackwards": ">=5.7.2"
+    "viabackwards": ">=5.11.0"
   },
   "custom": {
     "modmenu:api": true,

gradle.properties

@@ -7,7 +7,7 @@ org.gradle.configuration-cache=true
 project_jvm_version=17
 
 project_group=com.viaversion
-project_version=4.1.0-SNAPSHOT
+project_version=4.1.3
 project_description=ViaVersion addon to allow 1.8.x and 1.7.x clients on newer server versions.
 
 publishing_dev_id=florianreuth
@@ -15,6 +15,6 @@ publishing_dev_name=Florian Reuth
 publishing_dev_mail=git@florianreuth.de
 
 # Modrinth/Hangar Publishing
-minecraft_versions=26.1.2, 26.1.1, 26.1, 1.21.11, 1.21.10, 1.21.9, 1.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4, 1.21.3, 1.21.2, 1.21.1, 1.21, 1.20.6, 1.20.5, 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, 1.8.8
-minecraft_version_range=1.8-26.1.2
+minecraft_versions=26.2, 26.1.2, 26.1.1, 26.1, 1.21.11, 1.21.10, 1.21.9, 1.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4, 1.21.3, 1.21.2, 1.21.1, 1.21, 1.20.6, 1.20.5, 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, 1.8.8
+minecraft_version_range=1.8-26.2
 velocity_version=3.4-3.5

gradle/wrapper/gradle-wrapper.properties

@@ -1,8 +1,10 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionSha256Sum=2ab2958f2a1e51120c326cad6f385153bb11ee93b3c216c5fccebfdfbb7ec6cb
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-bin.zip
+distributionSha256Sum=bbaeb2fef8710818cf0e261201dab964c572f92b942812df0c3620d62a529a01
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.6.0-bin.zip
 networkTimeout=10000
+retries=0
+retryBackOffMs=500
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew

@@ -20,7 +20,7 @@
 
 ##############################################################################
 #
-#   Gradle start up script for POSIX generated by Gradle.
+#   gradlew start up script for POSIX generated by Gradle.
 #
 #   Important for running:
 #
@@ -29,7 +29,7 @@
 #       bash, then to run this script, type that shell name before the whole
 #       command line, like:
 #
-#           ksh Gradle
+#           ksh gradlew
 #
 #       Busybox and similar reduced shells will NOT work, because this script
 #       requires all of these POSIX shell features:
@@ -57,7 +57,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/2d6327017519d23b96af35865dc997fcb544fb40/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/3d91ce3b8caaf77ad09f381f43615b715b53f72c/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.

gradlew.bat

@@ -19,12 +19,12 @@
 @if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
 @rem
-@rem  Gradle startup script for Windows
+@rem  gradlew startup script for Windows
 @rem
 @rem ##########################################################################
 
-@rem Set local scope for the variables with windows NT shell
-if "%OS%"=="Windows_NT" setlocal
+@rem Set local scope for the variables, and ensure extensions are enabled
+setlocal EnableExtensions
 
 set DIRNAME=%~dp0
 if "%DIRNAME%"=="" set DIRNAME=.
@@ -51,7 +51,7 @@ echo. 1>&2
 echo Please set the JAVA_HOME variable in your environment to match the 1>&2
 echo location of your Java installation. 1>&2
 
-goto fail
+"%COMSPEC%" /c exit 1
 
 :findJavaFromJavaHome
 set JAVA_HOME=%JAVA_HOME:"=%
@@ -65,29 +65,18 @@ echo. 1>&2
 echo Please set the JAVA_HOME variable in your environment to match the 1>&2
 echo location of your Java installation. 1>&2
 
-goto fail
+"%COMSPEC%" /c exit 1
 
 :execute
 @rem Setup the command line
 
 
 
-@rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+@rem Execute gradlew
+@rem endlocal doesn't take effect until after the line is parsed and variables are expanded
+@rem which allows us to clear the local environment before executing the java command
+endlocal & "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %* & call :exitWithErrorLevel
 
-:end
-@rem End local scope for the variables with windows NT shell
-if %ERRORLEVEL% equ 0 goto mainEnd
-
-:fail
-rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
-rem the _cmd.exe /c_ return code!
-set EXIT_CODE=%ERRORLEVEL%
-if %EXIT_CODE% equ 0 set EXIT_CODE=1
-if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
-exit /b %EXIT_CODE%
-
-:mainEnd
-if "%OS%"=="Windows_NT" endlocal
-
-:omega
+:exitWithErrorLevel
+@rem Use "%COMSPEC%" /c exit to allow operators to work properly in scripts
+"%COMSPEC%" /c exit %ERRORLEVEL%

sponge/src/main/resources/META-INF/sponge_plugins.json

@@ -36,11 +36,11 @@
       },
       {
         "id": "viaversion",
-        "version": "[5.7.2,)"
+        "version": "[5.11.0,)"
       },
       {
         "id": "viabackwards",
-        "version": "[5.7.2,)"
+        "version": "[5.11.0,)"
       }
     ]
   },