BlockTextures.java

package com.hypixel.hytale.protocol;

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.Objects;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class BlockTextures {
   public static final int NULLABLE_BIT_FIELD_SIZE = 1;
   public static final int FIXED_BLOCK_SIZE = 5;
   public static final int VARIABLE_FIELD_COUNT = 6;
   public static final int VARIABLE_BLOCK_START = 29;
   public static final int MAX_SIZE = 98304059;
   @Nullable
   public String top;
   @Nullable
   public String bottom;
   @Nullable
   public String front;
   @Nullable
   public String back;
   @Nullable
   public String left;
   @Nullable
   public String right;
   public float weight;

   public BlockTextures() {
   }

   public BlockTextures(@Nullable String top, @Nullable String bottom, @Nullable String front, @Nullable String back, @Nullable String left, @Nullable String right, float weight) {
      this.top = top;
      this.bottom = bottom;
      this.front = front;
      this.back = back;
      this.left = left;
      this.right = right;
      this.weight = weight;
   }

   public BlockTextures(@Nonnull BlockTextures other) {
      this.top = other.top;
      this.bottom = other.bottom;
      this.front = other.front;
      this.back = other.back;
      this.left = other.left;
      this.right = other.right;
      this.weight = other.weight;
   }

   @Nonnull
   public static BlockTextures deserialize(@Nonnull ByteBuf buf, int offset) {
      BlockTextures obj = new BlockTextures();
      byte nullBits = buf.getByte(offset);
      obj.weight = buf.getFloatLE(offset + 1);
      if ((nullBits & 1) != 0) {
         int varPos0 = offset + 29 + buf.getIntLE(offset + 5);
         int topLen = VarInt.peek(buf, varPos0);
         if (topLen < 0) {
            throw ProtocolException.negativeLength("Top", topLen);
         }

         if (topLen > 4096000) {
            throw ProtocolException.stringTooLong("Top", topLen, 4096000);
         }

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

      if ((nullBits & 2) != 0) {
         int varPos1 = offset + 29 + buf.getIntLE(offset + 9);
         int bottomLen = VarInt.peek(buf, varPos1);
         if (bottomLen < 0) {
            throw ProtocolException.negativeLength("Bottom", bottomLen);
         }

         if (bottomLen > 4096000) {
            throw ProtocolException.stringTooLong("Bottom", bottomLen, 4096000);
         }

         obj.bottom = PacketIO.readVarString(buf, varPos1, PacketIO.UTF8);
      }

      if ((nullBits & 4) != 0) {
         int varPos2 = offset + 29 + buf.getIntLE(offset + 13);
         int frontLen = VarInt.peek(buf, varPos2);
         if (frontLen < 0) {
            throw ProtocolException.negativeLength("Front", frontLen);
         }

         if (frontLen > 4096000) {
            throw ProtocolException.stringTooLong("Front", frontLen, 4096000);
         }

         obj.front = PacketIO.readVarString(buf, varPos2, PacketIO.UTF8);
      }

      if ((nullBits & 8) != 0) {
         int varPos3 = offset + 29 + buf.getIntLE(offset + 17);
         int backLen = VarInt.peek(buf, varPos3);
         if (backLen < 0) {
            throw ProtocolException.negativeLength("Back", backLen);
         }

         if (backLen > 4096000) {
            throw ProtocolException.stringTooLong("Back", backLen, 4096000);
         }

         obj.back = PacketIO.readVarString(buf, varPos3, PacketIO.UTF8);
      }

      if ((nullBits & 16) != 0) {
         int varPos4 = offset + 29 + buf.getIntLE(offset + 21);
         int leftLen = VarInt.peek(buf, varPos4);
         if (leftLen < 0) {
            throw ProtocolException.negativeLength("Left", leftLen);
         }

         if (leftLen > 4096000) {
            throw ProtocolException.stringTooLong("Left", leftLen, 4096000);
         }

         obj.left = PacketIO.readVarString(buf, varPos4, PacketIO.UTF8);
      }

      if ((nullBits & 32) != 0) {
         int varPos5 = offset + 29 + buf.getIntLE(offset + 25);
         int rightLen = VarInt.peek(buf, varPos5);
         if (rightLen < 0) {
            throw ProtocolException.negativeLength("Right", rightLen);
         }

         if (rightLen > 4096000) {
            throw ProtocolException.stringTooLong("Right", rightLen, 4096000);
         }

         obj.right = PacketIO.readVarString(buf, varPos5, PacketIO.UTF8);
      }

      return obj;
   }

   public static int computeBytesConsumed(@Nonnull ByteBuf buf, int offset) {
      byte nullBits = buf.getByte(offset);
      int maxEnd = 29;
      if ((nullBits & 1) != 0) {
         int fieldOffset0 = buf.getIntLE(offset + 5);
         int pos0 = offset + 29 + 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 + 9);
         int pos1 = offset + 29 + fieldOffset1;
         int sl = VarInt.peek(buf, pos1);
         pos1 += VarInt.length(buf, pos1) + sl;
         if (pos1 - offset > maxEnd) {
            maxEnd = pos1 - offset;
         }
      }

      if ((nullBits & 4) != 0) {
         int fieldOffset2 = buf.getIntLE(offset + 13);
         int pos2 = offset + 29 + fieldOffset2;
         int sl = VarInt.peek(buf, pos2);
         pos2 += VarInt.length(buf, pos2) + sl;
         if (pos2 - offset > maxEnd) {
            maxEnd = pos2 - offset;
         }
      }

      if ((nullBits & 8) != 0) {
         int fieldOffset3 = buf.getIntLE(offset + 17);
         int pos3 = offset + 29 + fieldOffset3;
         int sl = VarInt.peek(buf, pos3);
         pos3 += VarInt.length(buf, pos3) + sl;
         if (pos3 - offset > maxEnd) {
            maxEnd = pos3 - offset;
         }
      }

      if ((nullBits & 16) != 0) {
         int fieldOffset4 = buf.getIntLE(offset + 21);
         int pos4 = offset + 29 + fieldOffset4;
         int sl = VarInt.peek(buf, pos4);
         pos4 += VarInt.length(buf, pos4) + sl;
         if (pos4 - offset > maxEnd) {
            maxEnd = pos4 - offset;
         }
      }

      if ((nullBits & 32) != 0) {
         int fieldOffset5 = buf.getIntLE(offset + 25);
         int pos5 = offset + 29 + fieldOffset5;
         int sl = VarInt.peek(buf, pos5);
         pos5 += VarInt.length(buf, pos5) + sl;
         if (pos5 - offset > maxEnd) {
            maxEnd = pos5 - offset;
         }
      }

      return maxEnd;
   }

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

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

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

      if (this.back != null) {
         nullBits = (byte)(nullBits | 8);
      }

      if (this.left != null) {
         nullBits = (byte)(nullBits | 16);
      }

      if (this.right != null) {
         nullBits = (byte)(nullBits | 32);
      }

      buf.writeByte(nullBits);
      buf.writeFloatLE(this.weight);
      int topOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int bottomOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int frontOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int backOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int leftOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int rightOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int varBlockStart = buf.writerIndex();
      if (this.top != null) {
         buf.setIntLE(topOffsetSlot, buf.writerIndex() - varBlockStart);
         PacketIO.writeVarString(buf, this.top, 4096000);
      } else {
         buf.setIntLE(topOffsetSlot, -1);
      }

      if (this.bottom != null) {
         buf.setIntLE(bottomOffsetSlot, buf.writerIndex() - varBlockStart);
         PacketIO.writeVarString(buf, this.bottom, 4096000);
      } else {
         buf.setIntLE(bottomOffsetSlot, -1);
      }

      if (this.front != null) {
         buf.setIntLE(frontOffsetSlot, buf.writerIndex() - varBlockStart);
         PacketIO.writeVarString(buf, this.front, 4096000);
      } else {
         buf.setIntLE(frontOffsetSlot, -1);
      }

      if (this.back != null) {
         buf.setIntLE(backOffsetSlot, buf.writerIndex() - varBlockStart);
         PacketIO.writeVarString(buf, this.back, 4096000);
      } else {
         buf.setIntLE(backOffsetSlot, -1);
      }

      if (this.left != null) {
         buf.setIntLE(leftOffsetSlot, buf.writerIndex() - varBlockStart);
         PacketIO.writeVarString(buf, this.left, 4096000);
      } else {
         buf.setIntLE(leftOffsetSlot, -1);
      }

      if (this.right != null) {
         buf.setIntLE(rightOffsetSlot, buf.writerIndex() - varBlockStart);
         PacketIO.writeVarString(buf, this.right, 4096000);
      } else {
         buf.setIntLE(rightOffsetSlot, -1);
      }

   }

   public int computeSize() {
      int size = 29;
      if (this.top != null) {
         size += PacketIO.stringSize(this.top);
      }

      if (this.bottom != null) {
         size += PacketIO.stringSize(this.bottom);
      }

      if (this.front != null) {
         size += PacketIO.stringSize(this.front);
      }

      if (this.back != null) {
         size += PacketIO.stringSize(this.back);
      }

      if (this.left != null) {
         size += PacketIO.stringSize(this.left);
      }

      if (this.right != null) {
         size += PacketIO.stringSize(this.right);
      }

      return size;
   }

   public static ValidationResult validateStructure(@Nonnull ByteBuf buffer, int offset) {
      if (buffer.readableBytes() - offset < 29) {
         return ValidationResult.error("Buffer too small: expected at least 29 bytes");
      } else {
         byte nullBits = buffer.getByte(offset);
         if ((nullBits & 1) != 0) {
            int topOffset = buffer.getIntLE(offset + 5);
            if (topOffset < 0) {
               return ValidationResult.error("Invalid offset for Top");
            }

            int pos = offset + 29 + topOffset;
            if (pos >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for Top");
            }

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

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

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

         if ((nullBits & 2) != 0) {
            int bottomOffset = buffer.getIntLE(offset + 9);
            if (bottomOffset < 0) {
               return ValidationResult.error("Invalid offset for Bottom");
            }

            int pos = offset + 29 + bottomOffset;
            if (pos >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for Bottom");
            }

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

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

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

         if ((nullBits & 4) != 0) {
            int frontOffset = buffer.getIntLE(offset + 13);
            if (frontOffset < 0) {
               return ValidationResult.error("Invalid offset for Front");
            }

            int pos = offset + 29 + frontOffset;
            if (pos >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for Front");
            }

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

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

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

         if ((nullBits & 8) != 0) {
            int backOffset = buffer.getIntLE(offset + 17);
            if (backOffset < 0) {
               return ValidationResult.error("Invalid offset for Back");
            }

            int pos = offset + 29 + backOffset;
            if (pos >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for Back");
            }

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

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

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

         if ((nullBits & 16) != 0) {
            int leftOffset = buffer.getIntLE(offset + 21);
            if (leftOffset < 0) {
               return ValidationResult.error("Invalid offset for Left");
            }

            int pos = offset + 29 + leftOffset;
            if (pos >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for Left");
            }

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

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

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

         if ((nullBits & 32) != 0) {
            int rightOffset = buffer.getIntLE(offset + 25);
            if (rightOffset < 0) {
               return ValidationResult.error("Invalid offset for Right");
            }

            int pos = offset + 29 + rightOffset;
            if (pos >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for Right");
            }

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

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

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

         return ValidationResult.OK;
      }
   }

   public BlockTextures clone() {
      BlockTextures copy = new BlockTextures();
      copy.top = this.top;
      copy.bottom = this.bottom;
      copy.front = this.front;
      copy.back = this.back;
      copy.left = this.left;
      copy.right = this.right;
      copy.weight = this.weight;
      return copy;
   }

   public boolean equals(Object obj) {
      if (this == obj) {
         return true;
      } else if (!(obj instanceof BlockTextures)) {
         return false;
      } else {
         BlockTextures other = (BlockTextures)obj;
         return Objects.equals(this.top, other.top) && Objects.equals(this.bottom, other.bottom) && Objects.equals(this.front, other.front) && Objects.equals(this.back, other.back) && Objects.equals(this.left, other.left) && Objects.equals(this.right, other.right) && this.weight == other.weight;
      }
   }

   public int hashCode() {
      return Objects.hash(new Object[]{this.top, this.bottom, this.front, this.back, this.left, this.right, this.weight});
   }
}