JsonUpdateCommand.java

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

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 JsonUpdateCommand {
   public static final int NULLABLE_BIT_FIELD_SIZE = 1;
   public static final int FIXED_BLOCK_SIZE = 7;
   public static final int VARIABLE_FIELD_COUNT = 4;
   public static final int VARIABLE_BLOCK_START = 23;
   public static final int MAX_SIZE = 1677721600;
   @Nonnull
   public JsonUpdateType type;
   @Nullable
   public String[] path;
   @Nullable
   public String value;
   @Nullable
   public String previousValue;
   @Nullable
   public String[] firstCreatedProperty;
   @Nullable
   public AssetEditorRebuildCaches rebuildCaches;

   public JsonUpdateCommand() {
      this.type = JsonUpdateType.SetProperty;
   }

   public JsonUpdateCommand(@Nonnull JsonUpdateType type, @Nullable String[] path, @Nullable String value, @Nullable String previousValue, @Nullable String[] firstCreatedProperty, @Nullable AssetEditorRebuildCaches rebuildCaches) {
      this.type = JsonUpdateType.SetProperty;
      this.type = type;
      this.path = path;
      this.value = value;
      this.previousValue = previousValue;
      this.firstCreatedProperty = firstCreatedProperty;
      this.rebuildCaches = rebuildCaches;
   }

   public JsonUpdateCommand(@Nonnull JsonUpdateCommand other) {
      this.type = JsonUpdateType.SetProperty;
      this.type = other.type;
      this.path = other.path;
      this.value = other.value;
      this.previousValue = other.previousValue;
      this.firstCreatedProperty = other.firstCreatedProperty;
      this.rebuildCaches = other.rebuildCaches;
   }

   @Nonnull
   public static JsonUpdateCommand deserialize(@Nonnull ByteBuf buf, int offset) {
      JsonUpdateCommand obj = new JsonUpdateCommand();
      byte nullBits = buf.getByte(offset);
      obj.type = JsonUpdateType.fromValue(buf.getByte(offset + 1));
      if ((nullBits & 16) != 0) {
         obj.rebuildCaches = AssetEditorRebuildCaches.deserialize(buf, offset + 2);
      }

      if ((nullBits & 1) != 0) {
         int varPos0 = offset + 23 + buf.getIntLE(offset + 7);
         int pathCount = VarInt.peek(buf, varPos0);
         if (pathCount < 0) {
            throw ProtocolException.negativeLength("Path", pathCount);
         }

         if (pathCount > 4096000) {
            throw ProtocolException.arrayTooLong("Path", pathCount, 4096000);
         }

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

         obj.path = new String[pathCount];
         int elemPos = varPos0 + varIntLen;

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

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

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

      if ((nullBits & 2) != 0) {
         int varPos1 = offset + 23 + buf.getIntLE(offset + 11);
         int valueLen = VarInt.peek(buf, varPos1);
         if (valueLen < 0) {
            throw ProtocolException.negativeLength("Value", valueLen);
         }

         if (valueLen > 4096000) {
            throw ProtocolException.stringTooLong("Value", valueLen, 4096000);
         }

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

      if ((nullBits & 4) != 0) {
         int varPos2 = offset + 23 + buf.getIntLE(offset + 15);
         int previousValueLen = VarInt.peek(buf, varPos2);
         if (previousValueLen < 0) {
            throw ProtocolException.negativeLength("PreviousValue", previousValueLen);
         }

         if (previousValueLen > 4096000) {
            throw ProtocolException.stringTooLong("PreviousValue", previousValueLen, 4096000);
         }

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

      if ((nullBits & 8) != 0) {
         int varPos3 = offset + 23 + buf.getIntLE(offset + 19);
         int firstCreatedPropertyCount = VarInt.peek(buf, varPos3);
         if (firstCreatedPropertyCount < 0) {
            throw ProtocolException.negativeLength("FirstCreatedProperty", firstCreatedPropertyCount);
         }

         if (firstCreatedPropertyCount > 4096000) {
            throw ProtocolException.arrayTooLong("FirstCreatedProperty", firstCreatedPropertyCount, 4096000);
         }

         int varIntLen = VarInt.length(buf, varPos3);
         if ((long)(varPos3 + varIntLen) + (long)firstCreatedPropertyCount * 1L > (long)buf.readableBytes()) {
            throw ProtocolException.bufferTooSmall("FirstCreatedProperty", varPos3 + varIntLen + firstCreatedPropertyCount * 1, buf.readableBytes());
         }

         obj.firstCreatedProperty = new String[firstCreatedPropertyCount];
         int elemPos = varPos3 + varIntLen;

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

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

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

      return obj;
   }

   public static int computeBytesConsumed(@Nonnull ByteBuf buf, int offset) {
      byte nullBits = buf.getByte(offset);
      int maxEnd = 23;
      if ((nullBits & 1) != 0) {
         int fieldOffset0 = buf.getIntLE(offset + 7);
         int pos0 = offset + 23 + 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 + 11);
         int pos1 = offset + 23 + 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 + 15);
         int pos2 = offset + 23 + 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 + 19);
         int pos3 = offset + 23 + fieldOffset3;
         int arrLen = VarInt.peek(buf, pos3);
         pos3 += VarInt.length(buf, pos3);

         for(int i = 0; i < arrLen; ++i) {
            int sl = VarInt.peek(buf, pos3);
            pos3 += VarInt.length(buf, pos3) + sl;
         }

         if (pos3 - offset > maxEnd) {
            maxEnd = pos3 - offset;
         }
      }

      return maxEnd;
   }

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

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

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

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

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

      buf.writeByte(nullBits);
      buf.writeByte(this.type.getValue());
      if (this.rebuildCaches != null) {
         this.rebuildCaches.serialize(buf);
      } else {
         buf.writeZero(5);
      }

      int pathOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int valueOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int previousValueOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int firstCreatedPropertyOffsetSlot = buf.writerIndex();
      buf.writeIntLE(0);
      int varBlockStart = buf.writerIndex();
      if (this.path != null) {
         buf.setIntLE(pathOffsetSlot, buf.writerIndex() - varBlockStart);
         if (this.path.length > 4096000) {
            throw ProtocolException.arrayTooLong("Path", this.path.length, 4096000);
         }

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

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

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

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

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

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

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

   }

   public int computeSize() {
      int size = 23;
      if (this.path != null) {
         int pathSize = 0;

         for(String elem : this.path) {
            pathSize += PacketIO.stringSize(elem);
         }

         size += VarInt.size(this.path.length) + pathSize;
      }

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

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

      if (this.firstCreatedProperty != null) {
         int firstCreatedPropertySize = 0;

         for(String elem : this.firstCreatedProperty) {
            firstCreatedPropertySize += PacketIO.stringSize(elem);
         }

         size += VarInt.size(this.firstCreatedProperty.length) + firstCreatedPropertySize;
      }

      return size;
   }

   public static ValidationResult validateStructure(@Nonnull ByteBuf buffer, int offset) {
      if (buffer.readableBytes() - offset < 23) {
         return ValidationResult.error("Buffer too small: expected at least 23 bytes");
      } else {
         byte nullBits = buffer.getByte(offset);
         if ((nullBits & 1) != 0) {
            int pathOffset = buffer.getIntLE(offset + 7);
            if (pathOffset < 0) {
               return ValidationResult.error("Invalid offset for Path");
            }

            int pos = offset + 23 + pathOffset;
            if (pos >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for Path");
            }

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

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

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

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

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

         if ((nullBits & 2) != 0) {
            int valueOffset = buffer.getIntLE(offset + 11);
            if (valueOffset < 0) {
               return ValidationResult.error("Invalid offset for Value");
            }

            int pos = offset + 23 + valueOffset;
            if (pos >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for Value");
            }

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

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

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

         if ((nullBits & 4) != 0) {
            int previousValueOffset = buffer.getIntLE(offset + 15);
            if (previousValueOffset < 0) {
               return ValidationResult.error("Invalid offset for PreviousValue");
            }

            int pos = offset + 23 + previousValueOffset;
            if (pos >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for PreviousValue");
            }

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

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

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

         if ((nullBits & 8) != 0) {
            int firstCreatedPropertyOffset = buffer.getIntLE(offset + 19);
            if (firstCreatedPropertyOffset < 0) {
               return ValidationResult.error("Invalid offset for FirstCreatedProperty");
            }

            int pos = offset + 23 + firstCreatedPropertyOffset;
            if (pos >= buffer.writerIndex()) {
               return ValidationResult.error("Offset out of bounds for FirstCreatedProperty");
            }

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

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

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

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

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

         return ValidationResult.OK;
      }
   }

   public JsonUpdateCommand clone() {
      JsonUpdateCommand copy = new JsonUpdateCommand();
      copy.type = this.type;
      copy.path = this.path != null ? (String[])Arrays.copyOf(this.path, this.path.length) : null;
      copy.value = this.value;
      copy.previousValue = this.previousValue;
      copy.firstCreatedProperty = this.firstCreatedProperty != null ? (String[])Arrays.copyOf(this.firstCreatedProperty, this.firstCreatedProperty.length) : null;
      copy.rebuildCaches = this.rebuildCaches != null ? this.rebuildCaches.clone() : null;
      return copy;
   }

   public boolean equals(Object obj) {
      if (this == obj) {
         return true;
      } else if (!(obj instanceof JsonUpdateCommand)) {
         return false;
      } else {
         JsonUpdateCommand other = (JsonUpdateCommand)obj;
         return Objects.equals(this.type, other.type) && Arrays.equals(this.path, other.path) && Objects.equals(this.value, other.value) && Objects.equals(this.previousValue, other.previousValue) && Arrays.equals(this.firstCreatedProperty, other.firstCreatedProperty) && Objects.equals(this.rebuildCaches, other.rebuildCaches);
      }
   }

   public int hashCode() {
      int result = 1;
      result = 31 * result + Objects.hashCode(this.type);
      result = 31 * result + Arrays.hashCode(this.path);
      result = 31 * result + Objects.hashCode(this.value);
      result = 31 * result + Objects.hashCode(this.previousValue);
      result = 31 * result + Arrays.hashCode(this.firstCreatedProperty);
      result = 31 * result + Objects.hashCode(this.rebuildCaches);
      return result;
   }
}