Equipment.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.Arrays;
import java.util.Objects;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class Equipment {
   public static final int NULLABLE_BIT_FIELD_SIZE = 1;
   public static final int FIXED_BLOCK_SIZE = 1;
   public static final int VARIABLE_FIELD_COUNT = 3;
   public static final int VARIABLE_BLOCK_START = 13;
   public static final int MAX_SIZE = 1677721600;
   @Nullable
   public String[] armorIds;
   @Nullable
   public String rightHandItemId;
   @Nullable
   public String leftHandItemId;

   public Equipment() {
   }

   public Equipment(@Nullable String[] armorIds, @Nullable String rightHandItemId, @Nullable String leftHandItemId) {
      this.armorIds = armorIds;
      this.rightHandItemId = rightHandItemId;
      this.leftHandItemId = leftHandItemId;
   }

   public Equipment(@Nonnull Equipment other) {
      this.armorIds = other.armorIds;
      this.rightHandItemId = other.rightHandItemId;
      this.leftHandItemId = other.leftHandItemId;
   }

   @Nonnull
   public static Equipment deserialize(@Nonnull ByteBuf buf, int offset) {
      Equipment obj = new Equipment();
      byte nullBits = buf.getByte(offset);
      if ((nullBits & 1) != 0) {
         int varPos0 = offset + 13 + buf.getIntLE(offset + 1);
         int armorIdsCount = VarInt.peek(buf, varPos0);
         if (armorIdsCount < 0) {
            throw ProtocolException.negativeLength("ArmorIds", armorIdsCount);
         }

         if (armorIdsCount > 4096000) {
            throw ProtocolException.arrayTooLong("ArmorIds", armorIdsCount, 4096000);
         }

         int varIntLen = VarInt.length(buf, varPos0);
         if ((long)(varPos0 + varIntLen) + (long)armorIdsCount * 1L > (long)buf.readableBytes()) {
            throw ProtocolException.bufferTooSmall("ArmorIds", varPos0 + varIntLen + armorIdsCount * 1, buf.readableBytes());
         }

         obj.armorIds = new String[armorIdsCount];
         int elemPos = varPos0 + varIntLen;

         for(int i = 0; i < armorIdsCount; ++i) {
            int strLen = VarInt.peek(buf, elemPos);
            if (strLen < 0) {
               throw ProtocolException.negativeLength("armorIds[" + i + "]", strLen);
            }

            if (strLen > 4096000) {
               throw ProtocolException.stringTooLong("armorIds[" + i + "]", strLen, 4096000);
            }

            int strVarLen = VarInt.length(buf, elemPos);
            obj.armorIds[i] = PacketIO.readVarString(buf, elemPos);
            elemPos += strVarLen + strLen;
         }
      }

      if ((nullBits & 2) != 0) {
         int varPos1 = offset + 13 + buf.getIntLE(offset + 5);
         int rightHandItemIdLen = VarInt.peek(buf, varPos1);
         if (rightHandItemIdLen < 0) {
            throw ProtocolException.negativeLength("RightHandItemId", rightHandItemIdLen);
         }

         if (rightHandItemIdLen > 4096000) {
            throw ProtocolException.stringTooLong("RightHandItemId", rightHandItemIdLen, 4096000);
         }

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

      if ((nullBits & 4) != 0) {
         int varPos2 = offset + 13 + buf.getIntLE(offset + 9);
         int leftHandItemIdLen = VarInt.peek(buf, varPos2);
         if (leftHandItemIdLen < 0) {
            throw ProtocolException.negativeLength("LeftHandItemId", leftHandItemIdLen);
         }

         if (leftHandItemIdLen > 4096000) {
            throw ProtocolException.stringTooLong("LeftHandItemId", leftHandItemIdLen, 4096000);
         }

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

      return obj;
   }

   public static int computeBytesConsumed(@Nonnull ByteBuf buf, int offset) {
      byte nullBits = buf.getByte(offset);
      int maxEnd = 13;
      if ((nullBits & 1) != 0) {
         int fieldOffset0 = buf.getIntLE(offset + 1);
         int pos0 = offset + 13 + fieldOffset0;
         int arrLen = VarInt.peek(buf, pos0);
         pos0 += VarInt.length(buf, pos0);

         for(int i = 0; i < arrLen; ++i) {
            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 + 5);
         int pos1 = offset + 13 + 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 + 9);
         int pos2 = offset + 13 + fieldOffset2;
         int sl = VarInt.peek(buf, pos2);
         pos2 += VarInt.length(buf, pos2) + sl;
         if (pos2 - offset > maxEnd) {
            maxEnd = pos2 - offset;
         }
      }

      return maxEnd;
   }

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

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

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

      buf.writeByte(nullBits);
      int armorIdsOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int rightHandItemIdOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int leftHandItemIdOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int varBlockStart = buf.writerIndex();
      if (this.armorIds != null) {
         buf.setIntLE(armorIdsOffsetSlot, buf.writerIndex() - varBlockStart);
         if (this.armorIds.length > 4096000) {
            throw ProtocolException.arrayTooLong("ArmorIds", this.armorIds.length, 4096000);
         }

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

         for(String item : this.armorIds) {
            PacketIO.writeVarString(buf, item, 4096000);
         }
      } else {
         buf.setIntLE(armorIdsOffsetSlot, -1);
      }

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

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

   }

   public int computeSize() {
      int size = 13;
      if (this.armorIds != null) {
         int armorIdsSize = 0;

         for(String elem : this.armorIds) {
            armorIdsSize += PacketIO.stringSize(elem);
         }

         size += VarInt.size(this.armorIds.length) + armorIdsSize;
      }

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

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

      return size;
   }

   public static ValidationResult validateStructure(@Nonnull ByteBuf buffer, int offset) {
      if (buffer.readableBytes() - offset < 13) {
         return ValidationResult.error("Buffer too small: expected at least 13 bytes");
      } else {
         byte nullBits = buffer.getByte(offset);
         if ((nullBits & 1) != 0) {
            int armorIdsOffset = buffer.getIntLE(offset + 1);
            if (armorIdsOffset < 0) {
               return ValidationResult.error("Invalid offset for ArmorIds");
            }

            int pos = offset + 13 + armorIdsOffset;
            if (pos >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for ArmorIds");
            }

            int armorIdsCount = VarInt.peek(buffer, pos);
            if (armorIdsCount < 0) {
               return ValidationResult.error("Invalid array count for ArmorIds");
            }

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

            pos += VarInt.length(buffer, pos);

            for(int i = 0; i < armorIdsCount; ++i) {
               int strLen = VarInt.peek(buffer, pos);
               if (strLen < 0) {
                  return ValidationResult.error("Invalid string length in ArmorIds");
               }

               pos += VarInt.length(buffer, pos);
               pos += strLen;
               if (pos > buffer.writerIndex()) {
                  return ValidationResult.error("Buffer overflow reading string in ArmorIds");
               }
            }
         }

         if ((nullBits & 2) != 0) {
            int rightHandItemIdOffset = buffer.getIntLE(offset + 5);
            if (rightHandItemIdOffset < 0) {
               return ValidationResult.error("Invalid offset for RightHandItemId");
            }

            int pos = offset + 13 + rightHandItemIdOffset;
            if (pos >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for RightHandItemId");
            }

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

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

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

         if ((nullBits & 4) != 0) {
            int leftHandItemIdOffset = buffer.getIntLE(offset + 9);
            if (leftHandItemIdOffset < 0) {
               return ValidationResult.error("Invalid offset for LeftHandItemId");
            }

            int pos = offset + 13 + leftHandItemIdOffset;
            if (pos >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for LeftHandItemId");
            }

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

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

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

         return ValidationResult.OK;
      }
   }

   public Equipment clone() {
      Equipment copy = new Equipment();
      copy.armorIds = this.armorIds != null ? (String[])Arrays.copyOf(this.armorIds, this.armorIds.length) : null;
      copy.rightHandItemId = this.rightHandItemId;
      copy.leftHandItemId = this.leftHandItemId;
      return copy;
   }

   public boolean equals(Object obj) {
      if (this == obj) {
         return true;
      } else if (!(obj instanceof Equipment)) {
         return false;
      } else {
         Equipment other = (Equipment)obj;
         return Arrays.equals(this.armorIds, other.armorIds) && Objects.equals(this.rightHandItemId, other.rightHandItemId) && Objects.equals(this.leftHandItemId, other.leftHandItemId);
      }
   }

   public int hashCode() {
      int result = 1;
      result = 31 * result + Arrays.hashCode(this.armorIds);
      result = 31 * result + Objects.hashCode(this.rightHandItemId);
      result = 31 * result + Objects.hashCode(this.leftHandItemId);
      return result;
   }
}