Working full chunk techhider workaround

Signed-off-by: Lixfel <agga-games@gmx.de>

FightSystem_15/src/de/steamwar/fightsystem/utils/TechHider_15.java

@@ -6,6 +6,9 @@ import com.comphenix.protocol.events.PacketAdapter;
 import com.comphenix.protocol.events.PacketContainer;
 import com.comphenix.protocol.events.PacketEvent;
 import com.comphenix.protocol.reflect.StructureModifier;
+import com.comphenix.protocol.wrappers.ChunkCoordIntPair;
+import com.comphenix.protocol.wrappers.MultiBlockChangeInfo;
+import com.comphenix.protocol.wrappers.WrappedBlockData;
 import com.comphenix.protocol.wrappers.nbt.NbtBase;
 import com.comphenix.protocol.wrappers.nbt.NbtCompound;
 import de.steamwar.fightsystem.Config;
@@ -13,10 +16,15 @@ import de.steamwar.fightsystem.IFightSystem;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.UnpooledByteBufAllocator;
 import net.minecraft.server.v1_15_R1.PacketPlayOutMapChunk;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.World;
 import org.bukkit.craftbukkit.v1_15_R1.CraftChunk;
 import org.bukkit.craftbukkit.v1_15_R1.entity.CraftPlayer;
 import org.bukkit.entity.Player;
 
+import java.lang.reflect.InvocationTargetException;
+import java.util.ArrayList;
 import java.util.List;
 
 import static de.steamwar.fightsystem.utils.ITechHider.bypass;
@@ -24,6 +32,9 @@ import static de.steamwar.fightsystem.utils.ITechHider.bypass;
 public class TechHider_15 {
     private TechHider_15(){}
 
+    private static final World WORLD = Bukkit.getWorlds().get(0);
+    private static final WrappedBlockData WRAPPED_BLOCK_DATA = WrappedBlockData.createData(ITechHider.obfuscateMaterial);
+
     static void reloadChunk(Player p, ITechHider.ChunkPos chunk){
         ((CraftPlayer)p).getHandle().playerConnection.sendPacket(new PacketPlayOutMapChunk(((CraftChunk)p.getWorld().getChunkAt(chunk.x(), chunk.z())).getHandle(), 65535));
     }
@@ -76,16 +87,17 @@ public class TechHider_15 {
                 changed = false;
                 StructureModifier<byte[]> byteArray = cached.getByteArrays();
                 int primaryBitMask = ints.read(2);
-                int numChunkSections = 0;
-                while(primaryBitMask != 0){
-                    numChunkSections += primaryBitMask & 1;
-                    primaryBitMask >>= 1;
-                }
                 byte [] data = byteArray.read(0);
                 ByteBuf buffer = UnpooledByteBufAllocator.DEFAULT.directBuffer(data.length + 100);
                 int i = 0;
 
-                while(numChunkSections > 0){
+                int chunkY = 0;
+                while(primaryBitMask != 0){
+                    while((primaryBitMask & 1) == 0){
+                        primaryBitMask >>= 1;
+                        chunkY++;
+                    }
+
                     buffer.writeBytes(data, i, 2); // Block count
                     i += 2;
                     byte bitsPerBlock = data[i++];
@@ -123,11 +135,13 @@ public class TechHider_15 {
                         i += dataArrayLength * 8;
                     }else{
                         //Full Chunk/no palette, so the chunk has to be crawled through
+                        //This didn't work, so workaround with MultiBlockChange-Packets was created
                         int dataArrayLength = ITechHider.readVarInt(data, i);
                         int dataArrayLengthLength = ITechHider.readVarIntLength(data, i);
-                        buffer.writeBytes(data, i, dataArrayLengthLength);
+                        buffer.writeBytes(data, i, dataArrayLengthLength + dataArrayLength * 8);
-                        i += dataArrayLengthLength;
+                        i += dataArrayLengthLength + dataArrayLength * 8;
 
+                        /*
                         ByteBuf chunkData = UnpooledByteBufAllocator.DEFAULT.directBuffer(dataArrayLength * 8);
                         chunkData.writeBytes(data, i, dataArrayLength * 8);
 
@@ -153,7 +167,6 @@ public class TechHider_15 {
                                 if(Config.HiddenBlocks.contains(blockId))
                                     blockId = Config.ObfuscateWith;
 
-                                //TODO: Fix last edge cases of Full Chunk techhider
                                 //if(blockId > 11336) Should not occur, but occurs
 
                                 result <<= 14;
@@ -176,9 +189,15 @@ public class TechHider_15 {
 
                             buffer.writeLong(result);
                             i += 8;
-                        }
+                        }*/
+
+                        final int cY = chunkY;
+                        Bukkit.getScheduler().runTaskAsynchronously(IFightSystem.getPlugin(),
+                                () -> fullChunkHider(p, chunkX, cY, chunkZ));
                     }
-                    numChunkSections--;
+
+                    primaryBitMask >>= 1;
+                    chunkY++;
                 }
                 buffer.writeBytes(data, i, data.length - i); // MC appends a 0 byte at the end if there is a full chunk, idk why
 
@@ -191,4 +210,39 @@ public class TechHider_15 {
         }).start(ITechHider.threadMultiplier * 4);
     }
 
+    private static void fullChunkHider(Player player, int chunkX, int chunkY, int chunkZ){
+        ArrayList<MultiBlockChangeInfo> blockChangeList = new ArrayList<>();
+
+        Location location = new Location(WORLD, chunkX * 16f, chunkY * 16f, chunkZ * 16f);
+        int maxXp1 = (chunkX+1) * 16;
+        int maxYp1 = (chunkY+1) * 16;
+        int maxZp1 = (chunkZ+1) * 16;
+        while(location.getBlockX() < maxXp1){
+            while(location.getBlockY() < maxYp1){
+                while(location.getBlockZ() < maxZp1){
+                    if(Config.HiddenBlockTags.contains(WORLD.getBlockAt(location).getType().name()))
+                        blockChangeList.add(new MultiBlockChangeInfo(location, WRAPPED_BLOCK_DATA));
+                    location.setZ(location.getZ() + 1);
+                }
+                location.setY(location.getY() + 1);
+                location.setZ(chunkZ * 16f);
+            }
+            location.setX(location.getX() + 1);
+            location.setY(chunkY * 16f);
+            location.setZ(chunkZ * 16f);
+        }
+
+        if(blockChangeList.isEmpty())
+            return;
+
+        PacketContainer packet = ProtocolLibrary.getProtocolManager().createPacket(PacketType.Play.Server.MULTI_BLOCK_CHANGE);
+        packet.getChunkCoordIntPairs().write(0, new ChunkCoordIntPair(chunkX, chunkZ));
+        packet.getMultiBlockChangeInfoArrays().write(0, blockChangeList.toArray(new MultiBlockChangeInfo[0]));
+
+        try {
+            ProtocolLibrary.getProtocolManager().sendServerPacket(player, packet, false);
+        } catch (InvocationTargetException e) {
+            throw new SecurityException("Something went wrong sending the multiblockchange packet", e);
+        }
+    }
 }