ItemLibrary.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.HashMap;
import java.util.Map;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
public class ItemLibrary {
public static final int NULLABLE_BIT_FIELD_SIZE = 1;
public static final int FIXED_BLOCK_SIZE = 1;
public static final int VARIABLE_FIELD_COUNT = 2;
public static final int VARIABLE_BLOCK_START = 9;
public static final int MAX_SIZE = 1677721600;
@Nullable
public ItemBase[] items;
@Nullable
public Map<Integer, String>[] blockMap;
public ItemLibrary() {
}
public ItemLibrary(@Nullable ItemBase[] items, @Nullable Map<Integer, String>[] blockMap) {
this.items = items;
this.blockMap = blockMap;
}
public ItemLibrary(@Nonnull ItemLibrary other) {
this.items = other.items;
this.blockMap = other.blockMap;
}
@Nonnull
public static ItemLibrary deserialize(@Nonnull ByteBuf buf, int offset) {
ItemLibrary obj = new ItemLibrary();
byte nullBits = buf.getByte(offset);
if ((nullBits & 1) != 0) {
int varPos0 = offset + 9 + buf.getIntLE(offset + 1);
int itemsCount = VarInt.peek(buf, varPos0);
if (itemsCount < 0) {
throw ProtocolException.negativeLength("Items", itemsCount);
}
if (itemsCount > 4096000) {
throw ProtocolException.arrayTooLong("Items", itemsCount, 4096000);
}
int varIntLen = VarInt.length(buf, varPos0);
if ((long)(varPos0 + varIntLen) + (long)itemsCount * 147L > (long)buf.readableBytes()) {
throw ProtocolException.bufferTooSmall("Items", varPos0 + varIntLen + itemsCount * 147, buf.readableBytes());
}
obj.items = new ItemBase[itemsCount];
int elemPos = varPos0 + varIntLen;
for(int i = 0; i < itemsCount; ++i) {
obj.items[i] = ItemBase.deserialize(buf, elemPos);
elemPos += ItemBase.computeBytesConsumed(buf, elemPos);
}
}
if ((nullBits & 2) != 0) {
int varPos1 = offset + 9 + buf.getIntLE(offset + 5);
int blockMapCount = VarInt.peek(buf, varPos1);
if (blockMapCount < 0) {
throw ProtocolException.negativeLength("BlockMap", blockMapCount);
}
if (blockMapCount > 4096000) {
throw ProtocolException.arrayTooLong("BlockMap", blockMapCount, 4096000);
}
int varIntLen = VarInt.length(buf, varPos1);
Map<Integer, String>[] blockMapArr = new Map[blockMapCount];
obj.blockMap = blockMapArr;
int elemPos = varPos1 + varIntLen;
for(int i = 0; i < blockMapCount; ++i) {
int mapLen = VarInt.peek(buf, elemPos);
int mapVarLen = VarInt.length(buf, elemPos);
HashMap<Integer, String> map = new HashMap(mapLen);
int mapPos = elemPos + mapVarLen;
for(int j = 0; j < mapLen; ++j) {
int key = buf.getIntLE(mapPos);
mapPos += 4;
int valLen = VarInt.peek(buf, mapPos);
if (valLen < 0) {
throw ProtocolException.negativeLength("val", valLen);
}
if (valLen > 4096000) {
throw ProtocolException.stringTooLong("val", valLen, 4096000);
}
int valVarLen = VarInt.length(buf, mapPos);
String val = PacketIO.readVarString(buf, mapPos);
mapPos += valVarLen + valLen;
if (map.put(key, val) != null) {
throw ProtocolException.duplicateKey("BlockMap[" + i + "]", key);
}
}
obj.blockMap[i] = map;
elemPos = mapPos;
}
}
return obj;
}
public static int computeBytesConsumed(@Nonnull ByteBuf buf, int offset) {
byte nullBits = buf.getByte(offset);
int maxEnd = 9;
if ((nullBits & 1) != 0) {
int fieldOffset0 = buf.getIntLE(offset + 1);
int pos0 = offset + 9 + fieldOffset0;
int arrLen = VarInt.peek(buf, pos0);
pos0 += VarInt.length(buf, pos0);
for(int i = 0; i < arrLen; ++i) {
pos0 += ItemBase.computeBytesConsumed(buf, pos0);
}
if (pos0 - offset > maxEnd) {
maxEnd = pos0 - offset;
}
}
if ((nullBits & 2) != 0) {
int fieldOffset1 = buf.getIntLE(offset + 5);
int pos1 = offset + 9 + fieldOffset1;
int arrLen = VarInt.peek(buf, pos1);
pos1 += VarInt.length(buf, pos1);
for(int i = 0; i < arrLen; ++i) {
int dictLen = VarInt.peek(buf, pos1);
pos1 += VarInt.length(buf, pos1);
for(int j = 0; j < dictLen; ++j) {
pos1 += 4;
int sl = VarInt.peek(buf, pos1);
pos1 += VarInt.length(buf, pos1) + sl;
}
}
if (pos1 - offset > maxEnd) {
maxEnd = pos1 - offset;
}
}
return maxEnd;
}
public void serialize(@Nonnull ByteBuf buf) {
int startPos = buf.writerIndex();
byte nullBits = 0;
if (this.items != null) {
nullBits = (byte)(nullBits | 1);
}
if (this.blockMap != null) {
nullBits = (byte)(nullBits | 2);
}
buf.writeByte(nullBits);
int itemsOffsetSlot = buf.writerIndex();
buf.writeIntLE(0);
int blockMapOffsetSlot = buf.writerIndex();
buf.writeIntLE(0);
int varBlockStart = buf.writerIndex();
if (this.items != null) {
buf.setIntLE(itemsOffsetSlot, buf.writerIndex() - varBlockStart);
if (this.items.length > 4096000) {
throw ProtocolException.arrayTooLong("Items", this.items.length, 4096000);
}
VarInt.write(buf, this.items.length);
for(ItemBase item : this.items) {
item.serialize(buf);
}
} else {
buf.setIntLE(itemsOffsetSlot, -1);
}
if (this.blockMap != null) {
buf.setIntLE(blockMapOffsetSlot, buf.writerIndex() - varBlockStart);
if (this.blockMap.length > 4096000) {
throw ProtocolException.arrayTooLong("BlockMap", this.blockMap.length, 4096000);
}
VarInt.write(buf, this.blockMap.length);
for(Map<Integer, String> item : this.blockMap) {
VarInt.write(buf, item.size());
for(Map.Entry<Integer, String> entry : item.entrySet()) {
buf.writeIntLE((Integer)entry.getKey());
PacketIO.writeVarString(buf, (String)entry.getValue(), 4096000);
}
}
} else {
buf.setIntLE(blockMapOffsetSlot, -1);
}
}
public int computeSize() {
int size = 9;
if (this.items != null) {
int itemsSize = 0;
for(ItemBase elem : this.items) {
itemsSize += elem.computeSize();
}
size += VarInt.size(this.items.length) + itemsSize;
}
if (this.blockMap != null) {
int blockMapSize = 0;
for(Map<Integer, String> elem : this.blockMap) {
blockMapSize += VarInt.size(elem.size()) + elem.entrySet().stream().mapToInt((kvpInner) -> 4 + PacketIO.stringSize((String)kvpInner.getValue())).sum();
}
size += VarInt.size(this.blockMap.length) + blockMapSize;
}
return size;
}
public static ValidationResult validateStructure(@Nonnull ByteBuf buffer, int offset) {
if (buffer.readableBytes() - offset < 9) {
return ValidationResult.error("Buffer too small: expected at least 9 bytes");
} else {
byte nullBits = buffer.getByte(offset);
if ((nullBits & 1) != 0) {
int itemsOffset = buffer.getIntLE(offset + 1);
if (itemsOffset < 0) {
return ValidationResult.error("Invalid offset for Items");
}
int pos = offset + 9 + itemsOffset;
if (pos >= buffer.writerIndex()) {
return ValidationResult.error("Offset out of bounds for Items");
}
int itemsCount = VarInt.peek(buffer, pos);
if (itemsCount < 0) {
return ValidationResult.error("Invalid array count for Items");
}
if (itemsCount > 4096000) {
return ValidationResult.error("Items exceeds max length 4096000");
}
pos += VarInt.length(buffer, pos);
for(int i = 0; i < itemsCount; ++i) {
ValidationResult structResult = ItemBase.validateStructure(buffer, pos);
if (!structResult.isValid()) {
return ValidationResult.error("Invalid ItemBase in Items[" + i + "]: " + structResult.error());
}
pos += ItemBase.computeBytesConsumed(buffer, pos);
}
}
if ((nullBits & 2) != 0) {
int blockMapOffset = buffer.getIntLE(offset + 5);
if (blockMapOffset < 0) {
return ValidationResult.error("Invalid offset for BlockMap");
}
int pos = offset + 9 + blockMapOffset;
if (pos >= buffer.writerIndex()) {
return ValidationResult.error("Offset out of bounds for BlockMap");
}
int blockMapCount = VarInt.peek(buffer, pos);
if (blockMapCount < 0) {
return ValidationResult.error("Invalid array count for BlockMap");
}
if (blockMapCount > 4096000) {
return ValidationResult.error("BlockMap exceeds max length 4096000");
}
pos += VarInt.length(buffer, pos);
for(int i = 0; i < blockMapCount; ++i) {
int blockMapDictLen = VarInt.peek(buffer, pos);
if (blockMapDictLen < 0) {
return ValidationResult.error("Invalid dictionary count in BlockMap[" + i + "]");
}
pos += VarInt.length(buffer, pos);
for(int j = 0; j < blockMapDictLen; ++j) {
pos += 4;
if (pos > buffer.writerIndex()) {
return ValidationResult.error("Buffer overflow reading blockMapKey");
}
int blockMapValLen = VarInt.peek(buffer, pos);
if (blockMapValLen < 0) {
return ValidationResult.error("Invalid string length for blockMapVal");
}
if (blockMapValLen > 4096000) {
return ValidationResult.error("blockMapVal exceeds max length 4096000");
}
pos += VarInt.length(buffer, pos);
pos += blockMapValLen;
if (pos > buffer.writerIndex()) {
return ValidationResult.error("Buffer overflow reading blockMapVal");
}
}
}
}
return ValidationResult.OK;
}
}
public ItemLibrary clone() {
ItemLibrary copy = new ItemLibrary();
copy.items = this.items != null ? (ItemBase[])Arrays.stream(this.items).map((e) -> e.clone()).toArray((x$0) -> new ItemBase[x$0]) : null;
copy.blockMap = this.blockMap != null ? (Map[])Arrays.stream(this.blockMap).map((d) -> new HashMap(d)).toArray((x$0) -> new Map[x$0]) : null;
return copy;
}
public boolean equals(Object obj) {
if (this == obj) {
return true;
} else if (!(obj instanceof ItemLibrary)) {
return false;
} else {
ItemLibrary other = (ItemLibrary)obj;
return Arrays.equals(this.items, other.items) && Arrays.equals(this.blockMap, other.blockMap);
}
}
public int hashCode() {
int result = 1;
result = 31 * result + Arrays.hashCode(this.items);
result = 31 * result + Arrays.hashCode(this.blockMap);
return result;
}
}