hytale-server/com/hypixel/hytale/protocol/packets/asseteditor/AssetEditorUpdateAsset.java

package com.hypixel.hytale.protocol.packets.asseteditor;

import com.hypixel.hytale.protocol.Packet;
import com.hypixel.hytale.protocol.io.PacketIO;
import com.hypixel.hytale.protocol.io.ProtocolException;
import com.hypixel.hytale.protocol.io.ValidationResult;
import com.hypixel.hytale.protocol.io.VarInt;
import io.netty.buffer.ByteBuf;
import java.util.Arrays;
import java.util.Objects;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class AssetEditorUpdateAsset implements Packet {
   public static final int PACKET_ID = 324;
   public static final boolean IS_COMPRESSED = false;
   public static final int NULLABLE_BIT_FIELD_SIZE = 1;
   public static final int FIXED_BLOCK_SIZE = 9;
   public static final int VARIABLE_FIELD_COUNT = 3;
   public static final int VARIABLE_BLOCK_START = 21;
   public static final int MAX_SIZE = 53248050;
   public int token;
   @Nullable
   public String assetType;
   @Nullable
   public AssetPath path;
   public int assetIndex = Integer.MIN_VALUE;
   @Nullable
   public byte[] data;

   @Override
   public int getId() {
      return 324;
   }

   public AssetEditorUpdateAsset() {
   }

   public AssetEditorUpdateAsset(int token, @Nullable String assetType, @Nullable AssetPath path, int assetIndex, @Nullable byte[] data) {
      this.token = token;
      this.assetType = assetType;
      this.path = path;
      this.assetIndex = assetIndex;
      this.data = data;
   }

   public AssetEditorUpdateAsset(@Nonnull AssetEditorUpdateAsset other) {
      this.token = other.token;
      this.assetType = other.assetType;
      this.path = other.path;
      this.assetIndex = other.assetIndex;
      this.data = other.data;
   }

   @Nonnull
   public static AssetEditorUpdateAsset deserialize(@Nonnull ByteBuf buf, int offset) {
      AssetEditorUpdateAsset obj = new AssetEditorUpdateAsset();
      byte nullBits = buf.getByte(offset);
      obj.token = buf.getIntLE(offset + 1);
      obj.assetIndex = buf.getIntLE(offset + 5);
      if ((nullBits & 1) != 0) {
         int varPos0 = offset + 21 + buf.getIntLE(offset + 9);
         int assetTypeLen = VarInt.peek(buf, varPos0);
         if (assetTypeLen < 0) {
            throw ProtocolException.negativeLength("AssetType", assetTypeLen);
         }

         if (assetTypeLen > 4096000) {
            throw ProtocolException.stringTooLong("AssetType", assetTypeLen, 4096000);
         }

         obj.assetType = PacketIO.readVarString(buf, varPos0, PacketIO.UTF8);
      }

      if ((nullBits & 2) != 0) {
         int varPos1 = offset + 21 + buf.getIntLE(offset + 13);
         obj.path = AssetPath.deserialize(buf, varPos1);
      }

      if ((nullBits & 4) != 0) {
         int varPos2 = offset + 21 + buf.getIntLE(offset + 17);
         int dataCount = VarInt.peek(buf, varPos2);
         if (dataCount < 0) {
            throw ProtocolException.negativeLength("Data", dataCount);
         }

         if (dataCount > 4096000) {
            throw ProtocolException.arrayTooLong("Data", dataCount, 4096000);
         }

         int varIntLen = VarInt.length(buf, varPos2);
         if (varPos2 + varIntLen + dataCount * 1L > buf.readableBytes()) {
            throw ProtocolException.bufferTooSmall("Data", varPos2 + varIntLen + dataCount * 1, buf.readableBytes());
         }

         obj.data = new byte[dataCount];

         for (int i = 0; i < dataCount; i++) {
            obj.data[i] = buf.getByte(varPos2 + varIntLen + i * 1);
         }
      }

      return obj;
   }

   public static int computeBytesConsumed(@Nonnull ByteBuf buf, int offset) {
      byte nullBits = buf.getByte(offset);
      int maxEnd = 21;
      if ((nullBits & 1) != 0) {
         int fieldOffset0 = buf.getIntLE(offset + 9);
         int pos0 = offset + 21 + fieldOffset0;
         int sl = VarInt.peek(buf, pos0);
         pos0 += VarInt.length(buf, pos0) + sl;
         if (pos0 - offset > maxEnd) {
            maxEnd = pos0 - offset;
         }
      }

      if ((nullBits & 2) != 0) {
         int fieldOffset1 = buf.getIntLE(offset + 13);
         int pos1 = offset + 21 + fieldOffset1;
         pos1 += AssetPath.computeBytesConsumed(buf, pos1);
         if (pos1 - offset > maxEnd) {
            maxEnd = pos1 - offset;
         }
      }

      if ((nullBits & 4) != 0) {
         int fieldOffset2 = buf.getIntLE(offset + 17);
         int pos2 = offset + 21 + fieldOffset2;
         int arrLen = VarInt.peek(buf, pos2);
         pos2 += VarInt.length(buf, pos2) + arrLen * 1;
         if (pos2 - offset > maxEnd) {
            maxEnd = pos2 - offset;
         }
      }

      return maxEnd;
   }

   @Override
   public void serialize(@Nonnull ByteBuf buf) {
      int startPos = buf.writerIndex();
      byte nullBits = 0;
      if (this.assetType != null) {
         nullBits = (byte)(nullBits | 1);
      }

      if (this.path != null) {
         nullBits = (byte)(nullBits | 2);
      }

      if (this.data != null) {
         nullBits = (byte)(nullBits | 4);
      }

      buf.writeByte(nullBits);
      buf.writeIntLE(this.token);
      buf.writeIntLE(this.assetIndex);
      int assetTypeOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int pathOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int dataOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int varBlockStart = buf.writerIndex();
      if (this.assetType != null) {
         buf.setIntLE(assetTypeOffsetSlot, buf.writerIndex() - varBlockStart);
         PacketIO.writeVarString(buf, this.assetType, 4096000);
      } else {
         buf.setIntLE(assetTypeOffsetSlot, -1);
      }

      if (this.path != null) {
         buf.setIntLE(pathOffsetSlot, buf.writerIndex() - varBlockStart);
         this.path.serialize(buf);
      } else {
         buf.setIntLE(pathOffsetSlot, -1);
      }

      if (this.data != null) {
         buf.setIntLE(dataOffsetSlot, buf.writerIndex() - varBlockStart);
         if (this.data.length > 4096000) {
            throw ProtocolException.arrayTooLong("Data", this.data.length, 4096000);
         }

         VarInt.write(buf, this.data.length);

         for (byte item : this.data) {
            buf.writeByte(item);
         }
      } else {
         buf.setIntLE(dataOffsetSlot, -1);
      }
   }

   @Override
   public int computeSize() {
      int size = 21;
      if (this.assetType != null) {
         size += PacketIO.stringSize(this.assetType);
      }

      if (this.path != null) {
         size += this.path.computeSize();
      }

      if (this.data != null) {
         size += VarInt.size(this.data.length) + this.data.length * 1;
      }

      return size;
   }

   public static ValidationResult validateStructure(@Nonnull ByteBuf buffer, int offset) {
      if (buffer.readableBytes() - offset < 21) {
         return ValidationResult.error("Buffer too small: expected at least 21 bytes");
      } else {
         byte nullBits = buffer.getByte(offset);
         if ((nullBits & 1) != 0) {
            int assetTypeOffset = buffer.getIntLE(offset + 9);
            if (assetTypeOffset < 0) {
               return ValidationResult.error("Invalid offset for AssetType");
            }

            int pos = offset + 21 + assetTypeOffset;
            if (pos >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for AssetType");
            }

            int assetTypeLen = VarInt.peek(buffer, pos);
            if (assetTypeLen < 0) {
               return ValidationResult.error("Invalid string length for AssetType");
            }

            if (assetTypeLen > 4096000) {
               return ValidationResult.error("AssetType exceeds max length 4096000");
            }

            pos += VarInt.length(buffer, pos);
            pos += assetTypeLen;
            if (pos > buffer.writerIndex()) {
               return ValidationResult.error("Buffer overflow reading AssetType");
            }
         }

         if ((nullBits & 2) != 0) {
            int pathOffset = buffer.getIntLE(offset + 13);
            if (pathOffset < 0) {
               return ValidationResult.error("Invalid offset for Path");
            }

            int posx = offset + 21 + pathOffset;
            if (posx >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for Path");
            }

            ValidationResult pathResult = AssetPath.validateStructure(buffer, posx);
            if (!pathResult.isValid()) {
               return ValidationResult.error("Invalid Path: " + pathResult.error());
            }

            posx += AssetPath.computeBytesConsumed(buffer, posx);
         }

         if ((nullBits & 4) != 0) {
            int dataOffset = buffer.getIntLE(offset + 17);
            if (dataOffset < 0) {
               return ValidationResult.error("Invalid offset for Data");
            }

            int posxx = offset + 21 + dataOffset;
            if (posxx >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for Data");
            }

            int dataCount = VarInt.peek(buffer, posxx);
            if (dataCount < 0) {
               return ValidationResult.error("Invalid array count for Data");
            }

            if (dataCount > 4096000) {
               return ValidationResult.error("Data exceeds max length 4096000");
            }

            posxx += VarInt.length(buffer, posxx);
            posxx += dataCount * 1;
            if (posxx > buffer.writerIndex()) {
               return ValidationResult.error("Buffer overflow reading Data");
            }
         }

         return ValidationResult.OK;
      }
   }

   public AssetEditorUpdateAsset clone() {
      AssetEditorUpdateAsset copy = new AssetEditorUpdateAsset();
      copy.token = this.token;
      copy.assetType = this.assetType;
      copy.path = this.path != null ? this.path.clone() : null;
      copy.assetIndex = this.assetIndex;
      copy.data = this.data != null ? Arrays.copyOf(this.data, this.data.length) : null;
      return copy;
   }

   @Override
   public boolean equals(Object obj) {
      if (this == obj) {
         return true;
      } else {
         return !(obj instanceof AssetEditorUpdateAsset other)
            ? false
            : this.token == other.token
               && Objects.equals(this.assetType, other.assetType)
               && Objects.equals(this.path, other.path)
               && this.assetIndex == other.assetIndex
               && Arrays.equals(this.data, other.data);
      }
   }

   @Override
   public int hashCode() {
      int result = 1;
      result = 31 * result + Integer.hashCode(this.token);
      result = 31 * result + Objects.hashCode(this.assetType);
      result = 31 * result + Objects.hashCode(this.path);
      result = 31 * result + Integer.hashCode(this.assetIndex);
      return 31 * result + Arrays.hashCode(this.data);
   }
}