Merge branch 'master' into EasyDev

# Conflicts:
#	SpigotCore_18/build.gradle
#	SpigotCore_19/build.gradle

SpigotCore_14/build.gradle

@@ -44,6 +44,8 @@ sourceSets {
 
 dependencies {
     implementation project(":SpigotCore_Main")
+    compileOnly project(":SpigotCore_8")
+    compileOnly project(":SpigotCore_9")
 
     compileOnly swdep("Spigot-1.14")
     compileOnly swdep("WorldEdit-1.15")

SpigotCore_14/src/de/steamwar/techhider/BlockIds14.java

@@ -0,0 +1,52 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import net.minecraft.server.v1_14_R1.*;
+import org.bukkit.Material;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class BlockIds14 implements BlockIds {
+    @Override
+    public int materialToId(Material material) {
+        return Block.getCombinedId(IRegistry.BLOCK.get(new MinecraftKey(material.name().toLowerCase())).getBlockData());
+    }
+
+    @Override
+    public Set<Integer> materialToAllIds(Material material) {
+        Set<Integer> ids = new HashSet<>();
+        for(IBlockData data : IRegistry.BLOCK.get(new MinecraftKey(material.name().toLowerCase())).getStates().a()) {
+            ids.add(Block.getCombinedId(data));
+        }
+
+        if(material == Material.WATER){
+            Fluid water = FluidTypes.WATER.a(false);
+            for(IBlockData data : Block.REGISTRY_ID){
+                if(data.p() == water){
+                    ids.add(Block.getCombinedId(data));
+                }
+            }
+        }
+
+        return ids;
+    }
+}

SpigotCore_14/src/de/steamwar/techhider/ChunkHider14.java

@@ -0,0 +1,141 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.UnpooledByteBufAllocator;
+
+import java.nio.ByteBuffer;
+import java.nio.LongBuffer;
+import java.util.Set;
+
+public class ChunkHider14 extends ChunkHider9 {
+
+    @Override
+    protected byte[] dataHider(int obfuscationTarget, Set<Integer> obfuscate, byte[] data, Integer primaryBitMask) {
+        ByteBuf buffer = UnpooledByteBufAllocator.DEFAULT.directBuffer(data.length + 100);
+        int i = 0;
+
+        while(primaryBitMask != 0){
+            while((primaryBitMask & 1) == 0){
+                primaryBitMask >>= 1;
+            }
+
+            buffer.writeBytes(data, i, 2); // Block count
+            i += 2;
+            byte bitsPerBlock = data[i++];
+            buffer.writeByte(bitsPerBlock);
+
+            if(bitsPerBlock < 9){
+                int paletteLength = ProtocolUtils.readVarInt(data, i);
+                int paletteLengthLength = ProtocolUtils.readVarIntLength(data, i);
+                buffer.writeBytes(data, i, paletteLengthLength);
+                i += paletteLengthLength;
+                for(int actPaletteId = 0; actPaletteId < paletteLength; actPaletteId++){
+                    int blockId = ProtocolUtils.readVarInt(data, i);
+                    int actPaletteLength = ProtocolUtils.readVarIntLength(data, i);
+
+                    if(obfuscate.contains(blockId)){
+                        buffer.writeBytes(ProtocolUtils.writeVarInt(obfuscationTarget));
+                    }else{
+                        buffer.writeBytes(data, i, actPaletteLength);
+                    }
+                    i += actPaletteLength;
+                }
+
+                //We modify only the chunk palette for performance reasons
+                int dataArrayLength = ProtocolUtils.readVarInt(data, i);
+                int dataArrayLengthLength = ProtocolUtils.readVarIntLength(data, i);
+                buffer.writeBytes(data, i, dataArrayLength * 8 + dataArrayLengthLength);
+                i += dataArrayLengthLength;
+                i += dataArrayLength * 8;
+            }else{
+                //Full Chunk/no palette, so the chunk has to be crawled through
+                int dataArrayLength = ProtocolUtils.readVarInt(data, i);
+                int dataArrayLengthLength = ProtocolUtils.readVarIntLength(data, i);
+                buffer.writeBytes(data, i, dataArrayLengthLength);
+                i += dataArrayLengthLength;
+
+                ByteBuffer source = ByteBuffer.wrap(data, i, dataArrayLength * 8);
+                VariableValueArray values = new VariableValueArray(bitsPerBlock, dataArrayLength, source.asLongBuffer());
+
+                for(int pos = 0; pos < 4096; pos++){
+                    if(obfuscate.contains(values.get(pos))){
+                        values.set(pos, obfuscationTarget);
+                    }
+                }
+
+                for(long l : values.backing)
+                    buffer.writeLong(l);
+
+                i += dataArrayLength * 8;
+            }
+
+            primaryBitMask >>= 1;
+        }
+        buffer.writeBytes(data, i, data.length - i); // MC appends a 0 byte at the end if there is a full chunk, idk why
+
+        data = new byte[buffer.readableBytes()];
+        buffer.readBytes(data);
+        return data;
+    }
+
+    private static final class VariableValueArray {
+        private final long[] backing;
+        private final int bitsPerValue;
+        private final long valueMask;
+
+        public VariableValueArray(int bitsPerEntry, int dataArrayLength, LongBuffer buffer) {
+            this.bitsPerValue = bitsPerEntry;
+            this.backing = new long[dataArrayLength];
+            buffer.get(backing);
+            this.valueMask = (1L << this.bitsPerValue) - 1;
+        }
+
+        public int get(int index) {
+            index *= bitsPerValue;
+            int i0 = index >> 6;
+            int i1 = index & 0x3f;
+
+            long value = backing[i0] >>> i1;
+
+            // The value is divided over two long values
+            if (i1 + bitsPerValue > 64) {
+                value |= backing[++i0] << 64 - i1;
+            }
+
+            return (int) (value & valueMask);
+        }
+
+        public void set(int index, int value) {
+            index *= bitsPerValue;
+            int i0 = index >> 6;
+            int i1 = index & 0x3f;
+
+            backing[i0] = this.backing[i0] & ~(this.valueMask << i1) | (value & valueMask) << i1;
+            int i2 = i1 + bitsPerValue;
+            // The value is divided over two long values
+            if (i2 > 64) {
+                i0++;
+                backing[i0] = backing[i0] & -(1L << i2 - 64) | value >> 64 - i1;
+            }
+        }
+    }
+}

SpigotCore_14/src/de/steamwar/techhider/ProtocolWrapper14.java

@@ -0,0 +1,50 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import com.comphenix.tinyprotocol.Reflection;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+
+import java.util.Set;
+import java.util.function.BiFunction;
+import java.util.function.UnaryOperator;
+
+public class ProtocolWrapper14 extends ProtocolWrapper8 {
+
+    @Override
+    public BiFunction<Player, Object, Object> blockBreakHiderGenerator(Class<?> blockBreakPacket, Object obfuscationTarget, Set<Material> obfuscate, TechHider.BypassEvaluator bypass) {
+        UnaryOperator<Object> blockBreakCloner = ProtocolUtils.shallowCloneGenerator(blockBreakPacket);
+        Reflection.FieldAccessor<?> blockBreakPosition = Reflection.getField(blockBreakPacket, TechHider.blockPosition, 0);
+        Reflection.FieldAccessor<?> blockBreakBlockData = Reflection.getField(blockBreakPacket, TechHider.iBlockData, 0);
+
+        return (p, packet) -> {
+            Object pos = blockBreakPosition.get(packet);
+            if(bypass.bypass(p, ProtocolUtils.posToChunk(TechHider.blockPositionX.get(pos)), ProtocolUtils.posToChunk(TechHider.blockPositionZ.get(pos))))
+                return packet;
+
+            if(ProtocolWrapper.impl.iBlockDataHidden(obfuscate, blockBreakBlockData.get(packet))){
+                packet = blockBreakCloner.apply(packet);
+                blockBreakBlockData.set(packet, obfuscationTarget);
+            }
+            return packet;
+        };
+    }
+}

SpigotCore_15/src/de/steamwar/techhider/BlockIds15.java

@@ -0,0 +1,52 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import net.minecraft.server.v1_15_R1.*;
+import org.bukkit.Material;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class BlockIds15 implements BlockIds {
+    @Override
+    public int materialToId(Material material) {
+        return Block.getCombinedId(IRegistry.BLOCK.get(new MinecraftKey(material.name().toLowerCase())).getBlockData());
+    }
+
+    @Override
+    public Set<Integer> materialToAllIds(Material material) {
+        Set<Integer> ids = new HashSet<>();
+        for(IBlockData data : IRegistry.BLOCK.get(new MinecraftKey(material.name().toLowerCase())).getStates().a()) {
+            ids.add(Block.getCombinedId(data));
+        }
+
+        if(material == Material.WATER){
+            Fluid water = FluidTypes.WATER.a(false);
+            for(IBlockData data : Block.REGISTRY_ID){
+                if(data.getFluid() == water){
+                    ids.add(Block.getCombinedId(data));
+                }
+            }
+        }
+
+        return ids;
+    }
+}

SpigotCore_18/build.gradle

@@ -49,5 +49,8 @@ dependencies {
     compileOnly swdep("WorldEdit-1.15")
 
     compileOnly 'org.spigotmc:spigot-api:1.18-R0.1-SNAPSHOT'
+    compileOnly 'com.mojang:datafixerupper:4.0.26'
+    compileOnly 'io.netty:netty-all:4.1.68.Final'
+    compileOnly 'com.mojang:authlib:1.5.25'
     compileOnly swdep("Spigot-1.18")
 }

SpigotCore_18/src/de/steamwar/techhider/BlockIds18.java

@@ -0,0 +1,57 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import net.minecraft.core.IRegistry;
+import net.minecraft.resources.MinecraftKey;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.state.IBlockData;
+import net.minecraft.world.level.material.Fluid;
+import net.minecraft.world.level.material.FluidTypes;
+import org.bukkit.Material;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class BlockIds18 implements BlockIds {
+    @Override
+    public int materialToId(Material material) {
+        return Block.i(IRegistry.U.a(new MinecraftKey(material.name().toLowerCase())).n());
+    }
+
+    @Override
+    public Set<Integer> materialToAllIds(Material material) {
+        Set<Integer> ids = new HashSet<>();
+        for(IBlockData data : IRegistry.U.a(new MinecraftKey(material.name().toLowerCase())).m().a()){
+            ids.add(Block.i(data));
+        }
+
+        if(material == Material.WATER){
+            Fluid water = FluidTypes.c.h();
+            for(IBlockData data : Block.o) {
+                if(data.o() == water) {
+                    ids.add(Block.i(data));
+                }
+            }
+        }
+
+        return ids;
+    }
+}

SpigotCore_18/src/de/steamwar/techhider/ChunkHider18.java

@@ -0,0 +1,154 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import com.comphenix.tinyprotocol.Reflection;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.UnpooledByteBufAllocator;
+import net.minecraft.core.IRegistry;
+import net.minecraft.network.protocol.game.ClientboundLevelChunkPacketData;
+import net.minecraft.network.protocol.game.ClientboundLevelChunkWithLightPacket;
+import net.minecraft.util.SimpleBitStorage;
+import net.minecraft.world.level.block.entity.TileEntityTypes;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+
+import java.nio.ByteBuffer;
+import java.util.List;
+import java.util.Set;
+import java.util.function.BiFunction;
+import java.util.function.IntFunction;
+import java.util.function.UnaryOperator;
+import java.util.stream.Collectors;
+
+public class ChunkHider18 implements ChunkHider {
+    @Override
+    public Class<?> mapChunkPacket() {
+        return ClientboundLevelChunkWithLightPacket.class;
+    }
+
+    private static final UnaryOperator<Object> chunkPacketCloner = ProtocolUtils.shallowCloneGenerator(ClientboundLevelChunkWithLightPacket.class);
+    private static final UnaryOperator<Object> chunkDataCloner = ProtocolUtils.shallowCloneGenerator(ClientboundLevelChunkPacketData.class);
+
+    private static final Reflection.FieldAccessor<Integer> chunkX = Reflection.getField(ClientboundLevelChunkWithLightPacket.class, int.class, 0);
+    private static final Reflection.FieldAccessor<Integer> chunkZ = Reflection.getField(ClientboundLevelChunkWithLightPacket.class, int.class, 1);
+    private static final Reflection.FieldAccessor<ClientboundLevelChunkPacketData> chunkData = Reflection.getField(ClientboundLevelChunkWithLightPacket.class, ClientboundLevelChunkPacketData.class, 0);
+
+    private static final Reflection.FieldAccessor<byte[]> dataField = Reflection.getField(ClientboundLevelChunkPacketData.class, byte[].class, 0);
+    private static final Reflection.FieldAccessor<List> tileEntities = Reflection.getField(ClientboundLevelChunkPacketData.class, List.class, 0);
+    public static final Class<?> tileEntity = Reflection.getClass("net.minecraft.network.protocol.game.ClientboundLevelChunkPacketData$a");
+    protected static final Reflection.FieldAccessor<TileEntityTypes> entityType = Reflection.getField(tileEntity, TileEntityTypes.class, 0);
+
+    @Override
+    public BiFunction<Player, Object, Object> chunkHiderGenerator(TechHider.BypassEvaluator bypass, int obfuscationTarget, Set<Integer> obfuscate, Set<String> hiddenBlockEntities) {
+        return (p, packet) -> {
+            if(bypass.bypass(p, chunkX.get(packet), chunkZ.get(packet)))
+                return packet;
+
+            packet = chunkPacketCloner.apply(packet);
+            Object data = chunkDataCloner.apply(chunkData.get(packet));
+
+            tileEntities.set(data, ((List<?>)tileEntities.get(data)).stream().filter(te -> tileEntityVisible(hiddenBlockEntities, te)).collect(Collectors.toList()));
+
+            World world = p.getWorld();
+            int sections = (world.getMaxHeight() - world.getMinHeight()) / 16;
+            dataField.set(data, dataHider(obfuscationTarget, obfuscate, dataField.get(data), sections));
+
+            chunkData.set(packet, data);
+            return packet;
+        };
+    }
+
+    protected boolean tileEntityVisible(Set<String> hiddenBlockEntities, Object tile) {
+        return !hiddenBlockEntities.contains(IRegistry.aa.b(entityType.get(tile)).a());
+    }
+
+    private byte[] dataHider(int obfuscationTarget, Set<Integer> obfuscate, byte[] data, int sections) {
+        ByteBuf buffer = UnpooledByteBufAllocator.DEFAULT.directBuffer(data.length + 100);
+        int i = 0;
+
+        while(sections-- > 0) {
+            buffer.writeBytes(data, i, 2); // Block count
+            i += 2;
+
+            i = containerWalker(data, buffer, i, 15, blockId -> obfuscate.contains(blockId) ? obfuscationTarget : blockId, (curI, dataArrayLength, bitsPerBlock) -> {
+                if(bitsPerBlock < 15) {
+                    buffer.writeBytes(data, curI, dataArrayLength * 8);
+                } else {
+                    ByteBuffer source = ByteBuffer.wrap(data, curI, dataArrayLength * 8);
+                    long[] array = new long[dataArrayLength];
+                    source.asLongBuffer().get(array);
+                    SimpleBitStorage values = new SimpleBitStorage(bitsPerBlock, 4096, array);
+
+                    for (int pos = 0; pos < 4096; pos++) {
+                        if (obfuscate.contains(values.a(pos))) {
+                            values.b(pos, obfuscationTarget);
+                        }
+                    }
+
+                    for (long l : values.a())
+                        buffer.writeLong(l);
+                }
+            });
+            i = containerWalker(data, buffer, i, 6, value -> value, (curI, dataArrayLength, bitsPerBlock) -> buffer.writeBytes(data, curI, dataArrayLength * 8));
+        }
+        buffer.writeBytes(data, i, data.length - i); // MC appends a 0 byte at the end if there is a full chunk, idk why
+
+        byte[] outdata = new byte[buffer.readableBytes()];
+        buffer.readBytes(outdata);
+        return outdata;
+    }
+
+    private int containerWalker(byte[] data, ByteBuf buffer, int i, int globalPalette, IntFunction<Integer> palette, TriConsumer<Integer, Integer, Byte> dataArray) {
+        byte bitsPerBlock = data[i++];
+        buffer.writeByte(bitsPerBlock);
+
+        if(bitsPerBlock == 0) {
+            int paletteValue = ProtocolUtils.readVarInt(data, i);
+            i += ProtocolUtils.readVarIntLength(data, i);
+            buffer.writeBytes(ProtocolUtils.writeVarInt(palette.apply(paletteValue)));
+        }else if(bitsPerBlock < globalPalette) {
+            int paletteLength = ProtocolUtils.readVarInt(data, i);
+            int paletteLengthLength = ProtocolUtils.readVarIntLength(data, i);
+            buffer.writeBytes(data, i, paletteLengthLength);
+            i += paletteLengthLength;
+
+            for(int actPaletteId = 0; actPaletteId < paletteLength; actPaletteId++) {
+                int paletteValue = ProtocolUtils.readVarInt(data, i);
+                i += ProtocolUtils.readVarIntLength(data, i);
+                buffer.writeBytes(ProtocolUtils.writeVarInt(palette.apply(paletteValue)));
+            }
+        }
+
+        int dataArrayLength = ProtocolUtils.readVarInt(data, i);
+        int dataArrayLengthLength = ProtocolUtils.readVarIntLength(data, i);
+        buffer.writeBytes(data, i, dataArrayLengthLength);
+        i += dataArrayLengthLength;
+
+        dataArray.accept(i, dataArrayLength, bitsPerBlock);
+        i += dataArrayLength * 8;
+
+        return i;
+    }
+
+    private interface TriConsumer<X, Y, Z> {
+        void accept(X x, Y y, Z z);
+    }
+}

SpigotCore_18/src/de/steamwar/techhider/ProtocolWrapper18.java

@@ -0,0 +1,77 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import com.comphenix.tinyprotocol.Reflection;
+import net.minecraft.core.IRegistry;
+import net.minecraft.core.SectionPosition;
+import net.minecraft.network.protocol.game.PacketPlayOutBlockBreak;
+import net.minecraft.world.level.block.entity.TileEntityTypes;
+import net.minecraft.world.level.block.state.IBlockData;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+
+import java.util.Set;
+import java.util.function.BiFunction;
+import java.util.function.UnaryOperator;
+
+public class ProtocolWrapper18 implements ProtocolWrapper {
+
+    private static final Reflection.FieldAccessor<SectionPosition> multiBlockChangeChunk = Reflection.getField(TechHider.multiBlockChangePacket, SectionPosition.class, 0);
+    private static final Reflection.FieldAccessor<IBlockData[]> multiBlockChangeBlocks = Reflection.getField(TechHider.multiBlockChangePacket, IBlockData[].class, 0);
+    private static final BiFunction<Object, UnaryOperator<Object>, Object> iBlockDataArrayCloner = ProtocolUtils.arrayCloneGenerator(TechHider.iBlockData);
+    @Override
+    public BiFunction<Player, Object, Object> multiBlockChangeGenerator(Object obfuscationTarget, Set<Material> obfuscate, TechHider.BypassEvaluator bypass) {
+        return (p, packet) -> {
+            Object chunkCoords = multiBlockChangeChunk.get(packet);
+            if(bypass.bypass(p, TechHider.blockPositionX.get(chunkCoords), TechHider.blockPositionZ.get(chunkCoords)))
+                return packet;
+
+            packet = TechHider.multiBlockChangeCloner.apply(packet);
+            multiBlockChangeBlocks.set(packet, iBlockDataArrayCloner.apply(multiBlockChangeBlocks.get(packet), block -> ProtocolWrapper.impl.iBlockDataHidden(obfuscate, block) ? obfuscationTarget : block));
+            return packet;
+        };
+    }
+
+    private static final Reflection.FieldAccessor<TileEntityTypes> tileEntityType = Reflection.getField(TechHider.tileEntityDataPacket, TileEntityTypes.class, 0);
+    @Override
+    public boolean unfilteredTileEntityDataAction(Object packet) {
+        return tileEntityType.get(packet) != TileEntityTypes.h;
+    }
+
+    @Override
+    public BiFunction<Player, Object, Object> blockBreakHiderGenerator(Class<?> blockBreakPacket, Object obfuscationTarget, Set<Material> obfuscate, TechHider.BypassEvaluator bypass) {
+        return (p, packet) -> {
+            PacketPlayOutBlockBreak breakPacket = (PacketPlayOutBlockBreak) packet;
+            if(bypass.bypass(p, ProtocolUtils.posToChunk(TechHider.blockPositionX.get(breakPacket.b())), ProtocolUtils.posToChunk(TechHider.blockPositionZ.get(breakPacket.b()))))
+                return packet;
+
+            if(!ProtocolWrapper.impl.iBlockDataHidden(obfuscate, breakPacket.c()))
+                return packet;
+
+            return new PacketPlayOutBlockBreak(breakPacket.b(), (IBlockData) obfuscationTarget, breakPacket.d(), breakPacket.a());
+        };
+    }
+
+    @Override
+    public boolean iBlockDataHidden(Set<Material> obfuscate, Object iBlockData) {
+        return obfuscate.contains(Material.getMaterial(IRegistry.U.b(((IBlockData) iBlockData).b()).a().toUpperCase()));
+    }
+}

SpigotCore_19/build.gradle

@@ -45,10 +45,12 @@ sourceSets {
 dependencies {
     implementation project(":SpigotCore_Main")
     implementation project(":SpigotCore_14")
+    compileOnly project(":SpigotCore_18")
 
     compileOnly swdep("WorldEdit-1.15")
 
     compileOnly 'org.spigotmc:spigot-api:1.19-R0.1-SNAPSHOT'
     compileOnly 'com.mojang:brigadier:1.0.18'
+    compileOnly 'com.mojang:datafixerupper:4.0.26'
     compileOnly swdep("Spigot-1.19")
 }

SpigotCore_19/src/de/steamwar/techhider/BlockIds19.java

@@ -0,0 +1,57 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import net.minecraft.core.IRegistry;
+import net.minecraft.resources.MinecraftKey;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.state.IBlockData;
+import net.minecraft.world.level.material.Fluid;
+import net.minecraft.world.level.material.FluidTypes;
+import org.bukkit.Material;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class BlockIds19 implements BlockIds {
+    @Override
+    public int materialToId(Material material) {
+        return Block.i(IRegistry.V.a(new MinecraftKey(material.name().toLowerCase())).m());
+    }
+
+    @Override
+    public Set<Integer> materialToAllIds(Material material) {
+        Set<Integer> ids = new HashSet<>();
+        for(IBlockData data : IRegistry.V.a(new MinecraftKey(material.name().toLowerCase())).k().a()){
+            ids.add(Block.i(data));
+        }
+
+        if(material == Material.WATER){
+            Fluid water = FluidTypes.c.h();
+            for(IBlockData data : Block.o) {
+                if(data.p() == water) {
+                    ids.add(Block.i(data));
+                }
+            }
+        }
+
+        return ids;
+    }
+}

SpigotCore_19/src/de/steamwar/techhider/ChunkHider19.java

@@ -0,0 +1,31 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import net.minecraft.core.IRegistry;
+
+import java.util.Set;
+
+public class ChunkHider19 extends ChunkHider18 {
+    @Override
+    protected boolean tileEntityVisible(Set<String> hiddenBlockEntities, Object tile) {
+        return !hiddenBlockEntities.contains(IRegistry.ab.b(entityType.get(tile)).a());
+    }
+}

SpigotCore_19/src/de/steamwar/techhider/ProtocolWrapper19.java

@@ -0,0 +1,67 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import com.comphenix.tinyprotocol.Reflection;
+import net.minecraft.core.IRegistry;
+import net.minecraft.core.SectionPosition;
+import net.minecraft.world.level.block.entity.TileEntityTypes;
+import net.minecraft.world.level.block.state.IBlockData;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+
+import java.util.Set;
+import java.util.function.BiFunction;
+import java.util.function.UnaryOperator;
+
+public class ProtocolWrapper19 implements ProtocolWrapper {
+
+    private static final Reflection.FieldAccessor<SectionPosition> multiBlockChangeChunk = Reflection.getField(TechHider.multiBlockChangePacket, SectionPosition.class, 0);
+    private static final Reflection.FieldAccessor<IBlockData[]> multiBlockChangeBlocks = Reflection.getField(TechHider.multiBlockChangePacket, IBlockData[].class, 0);
+    private static final BiFunction<Object, UnaryOperator<Object>, Object> iBlockDataArrayCloner = ProtocolUtils.arrayCloneGenerator(TechHider.iBlockData);
+    @Override
+    public BiFunction<Player, Object, Object> multiBlockChangeGenerator(Object obfuscationTarget, Set<Material> obfuscate, TechHider.BypassEvaluator bypass) {
+        return (p, packet) -> {
+            Object chunkCoords = multiBlockChangeChunk.get(packet);
+            if(bypass.bypass(p, TechHider.blockPositionX.get(chunkCoords), TechHider.blockPositionZ.get(chunkCoords)))
+                return packet;
+
+            packet = TechHider.multiBlockChangeCloner.apply(packet);
+            multiBlockChangeBlocks.set(packet, iBlockDataArrayCloner.apply(multiBlockChangeBlocks.get(packet), block -> ProtocolWrapper.impl.iBlockDataHidden(obfuscate, block) ? obfuscationTarget : block));
+            return packet;
+        };
+    }
+
+    private static final Reflection.FieldAccessor<TileEntityTypes> tileEntityType = Reflection.getField(TechHider.tileEntityDataPacket, TileEntityTypes.class, 0);
+    @Override
+    public boolean unfilteredTileEntityDataAction(Object packet) {
+        return tileEntityType.get(packet) != TileEntityTypes.h;
+    }
+
+    @Override
+    public BiFunction<Player, Object, Object> blockBreakHiderGenerator(Class<?> blockBreakPacket, Object obfuscationTarget, Set<Material> obfuscate, TechHider.BypassEvaluator bypass) {
+        return null;
+    }
+
+    @Override
+    public boolean iBlockDataHidden(Set<Material> obfuscate, Object iBlockData) {
+        return obfuscate.contains(Material.getMaterial(IRegistry.V.b(((IBlockData) iBlockData).b()).a().toUpperCase()));
+    }
+}

SpigotCore_8/src/de/steamwar/techhider/BlockIds8.java

@@ -0,0 +1,38 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import org.bukkit.Material;
+
+import java.util.Collections;
+import java.util.Set;
+
+public class BlockIds8 implements BlockIds {
+    @Override
+    @SuppressWarnings("deprecation")
+    public int materialToId(Material material) {
+        return material.getId() << 4;
+    }
+
+    @Override
+    public Set<Integer> materialToAllIds(Material material) {
+        return Collections.singleton(materialToId(material));
+    }
+}

SpigotCore_8/src/de/steamwar/techhider/ChunkHider8.java

@@ -0,0 +1,40 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import com.comphenix.tinyprotocol.Reflection;
+import org.bukkit.entity.Player;
+
+import java.util.Set;
+import java.util.function.BiFunction;
+
+public class ChunkHider8 implements ChunkHider {
+
+    protected static final Class<?> mapChunkPacket = Reflection.getClass("{nms}.PacketPlayOutMapChunk");
+    @Override
+    public Class<?> mapChunkPacket() {
+        return mapChunkPacket;
+    }
+
+    @Override
+    public BiFunction<Player, Object, Object> chunkHiderGenerator(TechHider.BypassEvaluator bypass, int obfuscationTarget, Set<Integer> obfuscate, Set<String> hiddenBlockEntities) {
+        return null;
+    }
+}

SpigotCore_8/src/de/steamwar/techhider/ProtocolWrapper8.java

@@ -0,0 +1,76 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import com.comphenix.tinyprotocol.Reflection;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+
+import java.util.Set;
+import java.util.function.BiFunction;
+import java.util.function.UnaryOperator;
+
+public class ProtocolWrapper8 implements ProtocolWrapper {
+    private static final Class<?> chunkCoordinateIntPair = Reflection.getClass("{nms}.ChunkCoordIntPair");
+    private static final Reflection.FieldAccessor<?> multiBlockChangeChunk = Reflection.getField(TechHider.multiBlockChangePacket, chunkCoordinateIntPair, 0);
+    private static final Reflection.FieldAccessor<Integer> chunkCoordinateX = Reflection.getField(chunkCoordinateIntPair, int.class, 0);
+    private static final Reflection.FieldAccessor<Integer> chunkCoordinateZ = Reflection.getField(chunkCoordinateIntPair, int.class, 1);
+    private static final Class<?> multiBlockChangeInfo = Reflection.getClass("{nms}.PacketPlayOutMultiBlockChange$MultiBlockChangeInfo");
+    private static final Reflection.ConstructorInvoker multiBlockChangeInfoConstructor = Reflection.getConstructor(multiBlockChangeInfo, TechHider.multiBlockChangePacket, short.class, TechHider.iBlockData);
+    private static final BiFunction<Object, UnaryOperator<Object>, Object> multiBlockChangeInfoArrayCloner = ProtocolUtils.arrayCloneGenerator(multiBlockChangeInfo);
+    private static final Reflection.FieldAccessor<?> multiBlockChangeInfoBlock = Reflection.getField(multiBlockChangeInfo, TechHider.iBlockData, 0);
+    private static final Reflection.FieldAccessor<?> multiBlockChangeInfoPos = Reflection.getField(multiBlockChangeInfo, short.class, 0);
+    private static final Class<?> multiBlockChangeInfoArray = Reflection.getClass("[L{nms}.PacketPlayOutMultiBlockChange$MultiBlockChangeInfo;");
+    private static final Reflection.FieldAccessor<?> multiBlockChangeInfos = Reflection.getField(TechHider.multiBlockChangePacket, multiBlockChangeInfoArray, 0);
+    @Override
+    public BiFunction<Player, Object, Object> multiBlockChangeGenerator(Object obfuscationTarget, Set<Material> obfuscate, TechHider.BypassEvaluator bypass) {
+        return (p, packet) -> {
+            Object chunkCoords = multiBlockChangeChunk.get(packet);
+            if(bypass.bypass(p, chunkCoordinateX.get(chunkCoords), chunkCoordinateZ.get(chunkCoords)))
+                return packet;
+
+            Object modpacket = TechHider.multiBlockChangeCloner.apply(packet);
+            multiBlockChangeInfos.set(modpacket, multiBlockChangeInfoArrayCloner.apply(multiBlockChangeInfos.get(modpacket), mbci -> {
+                if(ProtocolWrapper.impl.iBlockDataHidden(obfuscate, multiBlockChangeInfoBlock.get(mbci)))
+                    return multiBlockChangeInfoConstructor.invoke(modpacket, multiBlockChangeInfoPos.get(mbci), obfuscationTarget);
+                return mbci;
+            }));
+            return modpacket;
+        };
+    }
+
+    private static final Reflection.FieldAccessor<Integer> tileEntityDataAction = Reflection.getField(TechHider.tileEntityDataPacket, int.class, 0);
+    @Override
+    public boolean unfilteredTileEntityDataAction(Object packet) {
+        return tileEntityDataAction.get(packet) != 9;
+    }
+
+    @Override
+    public BiFunction<Player, Object, Object> blockBreakHiderGenerator(Class<?> blockBreakPacket, Object obfuscationTarget, Set<Material> obfuscate, TechHider.BypassEvaluator bypass) {
+        return null;
+    }
+
+    private static final Reflection.MethodInvoker getBlockByBlockData = Reflection.getTypedMethod(TechHider.iBlockData, null, TechHider.block);
+    private static final Reflection.MethodInvoker getMaterialByBlock = Reflection.getTypedMethod(TechHider.craftMagicNumbers, "getMaterial", Material.class, TechHider.block);
+    @Override
+    public boolean iBlockDataHidden(Set<Material> obfuscate, Object iBlockData) {
+        return obfuscate.contains((Material) getMaterialByBlock.invoke(null, getBlockByBlockData.invoke(iBlockData)));
+    }
+}

SpigotCore_9/build.gradle

@@ -44,6 +44,7 @@ sourceSets {
 
 dependencies {
     implementation project(":SpigotCore_Main")
+    compileOnly project(":SpigotCore_8")
 
     compileOnly swdep("Spigot-1.9")
 }

SpigotCore_9/src/de/steamwar/techhider/ChunkHider9.java

@@ -0,0 +1,108 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import com.comphenix.tinyprotocol.Reflection;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.UnpooledByteBufAllocator;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+
+import java.util.List;
+import java.util.Set;
+import java.util.function.BiFunction;
+import java.util.function.UnaryOperator;
+import java.util.logging.Level;
+import java.util.stream.Collectors;
+
+public class ChunkHider9 extends ChunkHider8 {
+
+    private static final UnaryOperator<Object> mapChunkCloner = ProtocolUtils.shallowCloneGenerator(mapChunkPacket);
+
+    private static final Reflection.FieldAccessor<Integer> mapChunkX = Reflection.getField(mapChunkPacket, int.class, 0);
+    private static final Reflection.FieldAccessor<Integer> mapChunkZ = Reflection.getField(mapChunkPacket, int.class, 1);
+    private static final Reflection.FieldAccessor<Integer> mapChunkBitMask = Reflection.getField(mapChunkPacket, int.class, 2);
+    private static final Reflection.FieldAccessor<List> mapChunkBlockEntities = Reflection.getField(mapChunkPacket, List.class, 0);
+    private static final Reflection.FieldAccessor<byte[]> mapChunkData = Reflection.getField(mapChunkPacket, byte[].class, 0);
+
+    private static final Class<?> nbtTagCompound = Reflection.getClass("{nms.nbt}.NBTTagCompound");
+    private static final Reflection.MethodInvoker nbtTagGetString = Reflection.getTypedMethod(nbtTagCompound, null, String.class, String.class);
+
+    @Override
+    public BiFunction<Player, Object, Object> chunkHiderGenerator(TechHider.BypassEvaluator bypass, int obfuscationTarget, Set<Integer> obfuscate, Set<String> hiddenBlockEntities) {
+        return (p, packet) -> {
+            if(bypass.bypass(p, mapChunkX.get(packet), mapChunkZ.get(packet)))
+                return packet;
+
+            packet = mapChunkCloner.apply(packet);
+            mapChunkBlockEntities.set(packet, ((List<?>)mapChunkBlockEntities.get(packet)).stream().filter(
+                    nbttag -> !hiddenBlockEntities.contains((String) nbtTagGetString.invoke(nbttag, "id"))
+            ).collect(Collectors.toList()));
+
+            byte[] data = dataHider(obfuscationTarget, obfuscate, mapChunkData.get(packet), mapChunkBitMask.get(packet));
+            mapChunkData.set(packet, data);
+
+            return packet;
+        };
+    }
+
+    protected byte[] dataHider(int obfuscationTarget, Set<Integer> obfuscate, byte[] data, Integer primaryBitMask) {
+        ByteBuf buffer = UnpooledByteBufAllocator.DEFAULT.directBuffer(data.length + 100);
+        int i = 0;
+
+        while(i < data.length){
+            byte bitsPerBlock = data[i++];
+            buffer.writeByte(bitsPerBlock);
+
+            if(bitsPerBlock != 13){
+                int paletteLength = ProtocolUtils.readVarInt(data, i);
+                int paletteLengthLength = ProtocolUtils.readVarIntLength(data, i);
+                buffer.writeBytes(data, i, paletteLengthLength);
+                i += paletteLengthLength;
+
+                for(int actPaletteId = 0; actPaletteId < paletteLength; actPaletteId++){
+                    int entry = ProtocolUtils.readVarInt(data, i);
+                    i += ProtocolUtils.readVarIntLength(data, i);
+
+                    if(obfuscate.contains(entry)){
+                        entry = obfuscationTarget;
+                    }
+                    buffer.writeBytes(ProtocolUtils.writeVarInt(entry));
+                }
+            }else{
+                buffer.writeByte(data[++i]); //Empty palette
+                Bukkit.getLogger().log(Level.SEVERE, "Full chunk occured");
+            }
+
+            int dataArrayLength = ProtocolUtils.readVarInt(data, i);
+            int dataArrayLengthLength = ProtocolUtils.readVarIntLength(data, i);
+            buffer.writeBytes(data, i, dataArrayLength*8 + dataArrayLengthLength);
+            i += dataArrayLengthLength;
+            i += dataArrayLength * 8;
+
+            buffer.writeBytes(data, i, 4096);
+            i += 4096; //Skylight (Not in Nether/End!!!) 2048 + Blocklight 2048
+        }
+
+        data = new byte[buffer.readableBytes()];
+        buffer.readBytes(data);
+        return data;
+    }
+}

SpigotCore_Main/src/de/steamwar/techhider/BlockIds.java

@@ -0,0 +1,33 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import de.steamwar.core.Core;
+import de.steamwar.core.VersionDependent;
+import org.bukkit.Material;
+
+import java.util.Set;
+
+public interface BlockIds {
+    BlockIds impl = VersionDependent.getVersionImpl(Core.getInstance());
+
+    int materialToId(Material material);
+    Set<Integer> materialToAllIds(Material material);
+}

SpigotCore_Main/src/de/steamwar/techhider/ChunkHider.java

@@ -0,0 +1,34 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2022  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import de.steamwar.core.Core;
+import de.steamwar.core.VersionDependent;
+import org.bukkit.entity.Player;
+
+import java.util.Set;
+import java.util.function.BiFunction;
+
+public interface ChunkHider {
+    ChunkHider impl = VersionDependent.getVersionImpl(Core.getInstance());
+
+    Class<?> mapChunkPacket();
+    BiFunction<Player, Object, Object> chunkHiderGenerator(TechHider.BypassEvaluator bypass, int obfuscationTarget, Set<Integer> obfuscate, Set<String> hiddenBlockEntities);
+}

SpigotCore_Main/src/de/steamwar/techhider/ProtocolUtils.java

@@ -0,0 +1,164 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2022  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import com.comphenix.tinyprotocol.Reflection;
+import com.comphenix.tinyprotocol.TinyProtocol;
+import com.google.common.primitives.Bytes;
+import org.bukkit.Bukkit;
+
+import java.lang.reflect.Array;
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.BiConsumer;
+import java.util.function.BiFunction;
+import java.util.function.UnaryOperator;
+
+public class ProtocolUtils {
+    private ProtocolUtils() {}
+
+    public static void broadcastPacket(Object packet) {
+        Bukkit.getOnlinePlayers().stream().map(TinyProtocol.instance::getChannel).filter(TinyProtocol.instance::hasInjected).forEach(channel -> TinyProtocol.instance.sendPacket(channel, packet));
+    }
+
+    public static BiFunction<Object, UnaryOperator<Object>, Object> arrayCloneGenerator(Class<?> elementClass) {
+        return (array, worker) -> {
+            int length = Array.getLength(array);
+            Object result = Array.newInstance(elementClass, length);
+
+            for(int i = 0; i < length; i++)
+                Array.set(result, i, worker.apply(Array.get(array, i)));
+
+            return result;
+        };
+    }
+
+    public static UnaryOperator<Object> shallowCloneGenerator(Class<?> clazz) {
+        BiConsumer<Object, Object> filler = shallowFill(clazz);
+
+        return source -> {
+            Object clone = Reflection.newInstance(clazz);
+            filler.accept(source, clone);
+            return clone;
+        };
+    }
+
+    private static BiConsumer<Object, Object> shallowFill(Class<?> clazz) {
+        if(clazz == null)
+            return (source, clone) -> {};
+
+        BiConsumer<Object, Object> superFiller = shallowFill(clazz.getSuperclass());
+
+        Field[] fds = clazz.getDeclaredFields();
+        List<Field> fields = new ArrayList<>();
+        for(Field field : fds) {
+            if (Modifier.isStatic(field.getModifiers()))
+                continue;
+
+            field.setAccessible(true);
+            fields.add(field);
+        }
+
+        return (source, clone) -> {
+            superFiller.accept(source, clone);
+            try {
+                for(Field field : fields) {
+                    field.set(clone, field.get(source));
+                }
+            } catch (IllegalAccessException e) {
+                throw new IllegalStateException("Could not set field", e);
+            }
+
+        };
+    }
+
+    public static int posToChunk(int c){
+        int chunk = c / 16;
+        if(c<0)
+            chunk--;
+        return chunk;
+    }
+
+    public static int readVarInt(byte[] array, int startPos) {
+        int numRead = 0;
+        int result = 0;
+        byte read;
+        do {
+            read = array[startPos + numRead];
+            int value = (read & 0b01111111);
+            result |= (value << (7 * numRead));
+
+            numRead++;
+            if (numRead > 5) {
+                break;
+            }
+        } while ((read & 0b10000000) != 0);
+
+        return result;
+    }
+
+    public static int readVarIntLength(byte[] array, int startPos) {
+        int numRead = 0;
+        byte read;
+        do {
+            read = array[startPos + numRead];
+            numRead++;
+            if (numRead > 5) {
+                break;
+            }
+        } while ((read & 0b10000000) != 0);
+
+        return numRead;
+    }
+
+    public static byte[] writeVarInt(int value) {
+        List<Byte> buffer = new ArrayList<>(5);
+        do {
+            byte temp = (byte)(value & 0b01111111);
+            // Note: >>> means that the sign bit is shifted with the rest of the number rather than being left alone
+            value >>>= 7;
+            if (value != 0) {
+                temp |= 0b10000000;
+            }
+            buffer.add(temp);
+        } while (value != 0);
+        return Bytes.toArray(buffer);
+    }
+
+    public static class ChunkPos{
+        final int x;
+        final int z;
+
+        public ChunkPos(int x, int z){
+            this.x = x;
+            this.z = z;
+        }
+
+        public final int x(){
+            return x;
+        }
+
+        public final int z(){
+            return z;
+        }
+    }
+}

SpigotCore_Main/src/de/steamwar/techhider/ProtocolWrapper.java

@@ -0,0 +1,41 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import de.steamwar.core.Core;
+import de.steamwar.core.VersionDependent;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+
+import java.util.Set;
+import java.util.function.BiFunction;
+
+public interface ProtocolWrapper {
+    ProtocolWrapper impl = VersionDependent.getVersionImpl(Core.getInstance());
+
+
+    boolean unfilteredTileEntityDataAction(Object packet);
+
+    BiFunction<Player, Object, Object> blockBreakHiderGenerator(Class<?> blockBreakPacket, Object obfuscationTarget, Set<Material> obfuscate, TechHider.BypassEvaluator bypass);
+
+    BiFunction<Player, Object, Object> multiBlockChangeGenerator(Object obfuscationTarget, Set<Material> obfuscate, TechHider.BypassEvaluator bypass);
+
+    boolean iBlockDataHidden(Set<Material> obfuscate, Object iBlockData);
+}

SpigotCore_Main/src/de/steamwar/techhider/TechHider.java

@@ -0,0 +1,128 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2021  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.techhider;
+
+import com.comphenix.tinyprotocol.Reflection;
+import com.comphenix.tinyprotocol.TinyProtocol;
+import de.steamwar.core.Core;
+import org.bukkit.GameMode;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+
+import java.util.*;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.function.UnaryOperator;
+import java.util.stream.Collectors;
+
+public class TechHider {
+
+    public static final Class<?> blockPosition = Reflection.getClass("{nms.core}.BlockPosition");
+    private static final Class<?> baseBlockPosition = Reflection.getClass("{nms.core}.BaseBlockPosition");
+    public static final Reflection.FieldAccessor<Integer> blockPositionX = Reflection.getField(baseBlockPosition, int.class, 0);
+    public static final Reflection.FieldAccessor<Integer> blockPositionZ = Reflection.getField(baseBlockPosition, int.class, 2);
+
+    public static final Class<?> iBlockData = Reflection.getClass("{nms.world.level.block.state}.IBlockData");
+    public static final Class<?> block = Reflection.getClass("{nms.world.level.block}.Block");
+    private static final Reflection.MethodInvoker getBlockDataByBlock = Reflection.getTypedMethod(block, null, iBlockData);
+
+    public static final Class<?> craftMagicNumbers = Reflection.getClass("{obc}.util.CraftMagicNumbers");
+    private static final Reflection.MethodInvoker getBlockByMaterial = Reflection.getTypedMethod(craftMagicNumbers, "getBlock", block, Material.class);
+
+    private final Map<Class<?>, BiFunction<Player, Object, Object>> techhiders = new HashMap<>();
+    private final BypassEvaluator bypass;
+    private final Object obfuscationTarget;
+    private final Set<Material> obfuscate;
+
+    public TechHider(BypassEvaluator bypass, Material obfuscationTarget, Set<Material> obfuscate, Set<String> hiddenBlockEntities) {
+        this.bypass = bypass;
+        this.obfuscate = obfuscate;
+        this.obfuscationTarget = getBlockDataByBlock.invoke(getBlockByMaterial.invoke(null, obfuscationTarget));
+
+        techhiders.put(blockActionPacket, this::blockActionHider);
+        techhiders.put(blockChangePacket, this::blockChangeHider);
+        techhiders.put(tileEntityDataPacket, this::tileEntityDataHider);
+        techhiders.put(multiBlockChangePacket,ProtocolWrapper.impl.multiBlockChangeGenerator(obfuscationTarget, obfuscate, bypass));
+        techhiders.put(ChunkHider.impl.mapChunkPacket(), ChunkHider.impl.chunkHiderGenerator(bypass, BlockIds.impl.materialToId(obfuscationTarget), obfuscate.stream().flatMap(m -> BlockIds.impl.materialToAllIds(m).stream()).collect(Collectors.toSet()), hiddenBlockEntities));
+
+        if(Core.getVersion() > 12 && Core.getVersion() < 19) {
+            Class<?> blockBreakClass = Reflection.getClass("{nms.network.protocol.game}.PacketPlayOutBlockBreak");
+            techhiders.put(blockBreakClass, ProtocolWrapper.impl.blockBreakHiderGenerator(blockBreakClass, obfuscationTarget, obfuscate, bypass));
+        }
+
+        if(Core.getVersion() > 8){
+            techhiders.put(Reflection.getClass("{nms.network.protocol.game}.PacketPlayInUseItem"), (p, packet) -> p.getGameMode() == GameMode.SPECTATOR ? null : packet);
+        }
+        techhiders.put(Reflection.getClass("{nms.network.protocol.game}.PacketPlayInUseEntity"), (p, packet) -> p.getGameMode() == GameMode.SPECTATOR ? null : packet);
+
+    }
+
+    public void enable() {
+        techhiders.forEach(TinyProtocol.instance::addFilter);
+    }
+
+    public void disable() {
+        techhiders.forEach(TinyProtocol.instance::removeFilter);
+    }
+
+    public static final Class<?> multiBlockChangePacket = Reflection.getClass("{nms.network.protocol.game}.PacketPlayOutMultiBlockChange");
+    public static final UnaryOperator<Object> multiBlockChangeCloner = ProtocolUtils.shallowCloneGenerator(TechHider.multiBlockChangePacket);
+
+    private static final Class<?> blockChangePacket = Reflection.getClass("{nms.network.protocol.game}.PacketPlayOutBlockChange");
+    private static final Function<Object, Object> blockChangeCloner = ProtocolUtils.shallowCloneGenerator(blockChangePacket);
+    private static final Reflection.FieldAccessor<?> blockChangePosition = Reflection.getField(blockChangePacket, blockPosition, 0);
+    private static final Reflection.FieldAccessor<?> blockChangeBlockData = Reflection.getField(blockChangePacket, iBlockData, 0);
+    private Object blockChangeHider(Player p, Object packet) {
+        Object pos = blockChangePosition.get(packet);
+        if(bypass.bypass(p, ProtocolUtils.posToChunk(blockPositionX.get(pos)), ProtocolUtils.posToChunk(blockPositionZ.get(pos))))
+            return packet;
+
+        if(ProtocolWrapper.impl.iBlockDataHidden(obfuscate, blockChangeBlockData.get(packet))) {
+            packet = blockChangeCloner.apply(packet);
+            blockChangeBlockData.set(packet, obfuscationTarget);
+        }
+        return packet;
+    }
+
+    private static final Class<?> blockActionPacket = Reflection.getClass("{nms.network.protocol.game}.PacketPlayOutBlockAction");
+    private static final Reflection.FieldAccessor<?> blockActionPosition = Reflection.getField(blockActionPacket, blockPosition, 0);
+    private Object blockActionHider(Player p, Object packet) {
+        Object pos = blockActionPosition.get(packet);
+        if(bypass.bypass(p, ProtocolUtils.posToChunk(blockPositionX.get(pos)), ProtocolUtils.posToChunk(blockPositionZ.get(pos))))
+            return packet;
+        return null;
+    }
+
+    public static final Class<?> tileEntityDataPacket = Reflection.getClass("{nms.network.protocol.game}.PacketPlayOutTileEntityData");
+    private static final Reflection.FieldAccessor<?> tileEntityDataPosition = Reflection.getField(tileEntityDataPacket, blockPosition, 0);
+    private Object tileEntityDataHider(Player p, Object packet) {
+        Object pos = tileEntityDataPosition.get(packet);
+        if(bypass.bypass(p, ProtocolUtils.posToChunk(blockPositionX.get(pos)), ProtocolUtils.posToChunk(blockPositionZ.get(pos))))
+            return packet;
+
+        if(ProtocolWrapper.impl.unfilteredTileEntityDataAction(packet))
+            return packet;
+        return null;
+    }
+
+    public interface BypassEvaluator {
+        boolean bypass(Player p, int chunkX, int chunkZ);
+    }
+}