src/main/java/net/querz/mca/Chunk.java - devel/querz-nbt - Rivoreo Source Code Repositories

 package net.querz.mca;

 import net.querz.nbt.tag.CompoundTag;
 import net.querz.nbt.tag.ListTag;
 import net.querz.nbt.io.NamedTag;
 import net.querz.nbt.io.NBTDeserializer;
 import net.querz.nbt.io.NBTSerializer;
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.RandomAccessFile;
 import java.util.Arrays;

 public class Chunk {

 	public static final int DEFAULT_DATA_VERSION = 1628;

 	private int lastMCAUpdate;

 	private CompoundTag data;

 	private int dataVersion;
 	private long lastUpdate;
 	private long inhabitedTime;
 	private int[] biomes;
 	private CompoundTag heightMaps;
 	private CompoundTag carvingMasks;
 	private Section[] sections = new Section[16]; //always initialized with size = 16 for fast access
 	private ListTag<CompoundTag> entities;
 	private ListTag<CompoundTag> tileEntities;
 	private ListTag<CompoundTag> tileTicks;
 	private ListTag<CompoundTag> liquidTicks;
 	private ListTag<ListTag<?>> lights;
 	private ListTag<ListTag<?>> liquidsToBeTicked;
 	private ListTag<ListTag<?>> toBeTicked;
 	private ListTag<ListTag<?>> postProcessing;
 	private String status;
 	private CompoundTag structures;

 	Chunk(int lastMCAUpdate) {
 		this.lastMCAUpdate = lastMCAUpdate;
 	}

 	/**
 	 * Create a new chunk based on raw base data from a region file.
 	 * @param data The raw base data to be used.
 	 */
 	public Chunk(CompoundTag data) {
 		this.data = data;
 		initReferences();
 	}

 	private void initReferences() {
 		if (data == null) {
 			throw new NullPointerException("data cannot be null");
 		}
 		CompoundTag level;
 		if ((level = data.getCompoundTag("Level")) == null) {
 			throw new IllegalArgumentException("data does not contain \"Level\" tag");
 		}
 		this.dataVersion = data.getInt("DataVersion");
 		this.inhabitedTime = level.getLong("InhabitedTime");
 		this.lastUpdate = level.getLong("LastUpdate");
 		this.biomes = level.getIntArray("Biomes");
 		this.heightMaps = level.getCompoundTag("HeightMaps");
 		this.carvingMasks = level.getCompoundTag("CarvingMasks");
 		this.entities = level.containsKey("Entities") ? level.getListTag("Entities").asCompoundTagList() : null;
 		this.tileEntities = level.containsKey("TileEntities") ? level.getListTag("TileEntities").asCompoundTagList() : null;
 		this.tileTicks = level.containsKey("TileTicks") ? level.getListTag("TileTicks").asCompoundTagList() : null;
 		this.liquidTicks = level.containsKey("LiquidTicks") ? level.getListTag("LiquidTicks").asCompoundTagList() : null;
 		this.lights = level.containsKey("Lights") ? level.getListTag("Lights").asListTagList() : null;
 		this.liquidsToBeTicked = level.containsKey("LiquidsToBeTicked") ? level.getListTag("LiquidsToBeTicked").asListTagList() : null;
 		this.toBeTicked = level.containsKey("ToBeTicked") ? level.getListTag("ToBeTicked").asListTagList() : null;
 		this.postProcessing = level.containsKey("PostProcessing") ? level.getListTag("PostProcessing").asListTagList() : null;
 		this.status = level.getString("Status");
 		this.structures = level.getCompoundTag("Structures");
 		if (level.containsKey("Sections")) {
 			for (CompoundTag section : level.getListTag("Sections").asCompoundTagList()) {
 				int sectionIndex = section.getByte("Y");
 				if (sectionIndex > 15 || sectionIndex < 0) {
 					continue;
 				}
 				Section newSection = new Section(section, dataVersion);
 				if (newSection.isEmpty()) {
 					continue;
 				}

 				this.sections[sectionIndex] = newSection;
 			}
 		}
 	}

 	/**
 	 * Serializes this chunk to a <code>RandomAccessFile</code>.
 	 * @param raf The RandomAccessFile to be written to.
 	 * @param xPos The x-coordinate of the chunk.
 	 * @param zPos The z-coodrinate of the chunk.
 	 * @return The amount of bytes written to the RandomAccessFile.
 	 * @throws IOException When something went wrong during writing.
 	 */
 	public int serialize(RandomAccessFile raf, int xPos, int zPos) throws IOException {
 		ByteArrayOutputStream baos = new ByteArrayOutputStream(4096);
 		try (BufferedOutputStream nbtOut = new BufferedOutputStream(CompressionType.ZLIB.compress(baos))) {
 			new NBTSerializer(false).toStream(new NamedTag(null, updateHandle(xPos, zPos)), nbtOut);
 		}
 		byte[] rawData = baos.toByteArray();
 		raf.writeInt(rawData.length + 1); // including the byte to store the compression type
 		raf.writeByte(CompressionType.ZLIB.getID());
 		raf.write(rawData);
 		return rawData.length + 5;
 	}

 	/**
 	 * Reads chunk data from a RandomAccessFile. The RandomAccessFile must already be at the correct position.
 	 * @param raf The RandomAccessFile to read the chunk data from.
 	 * @throws IOException When something went wrong during reading.
 	 */
 	public void deserialize(RandomAccessFile raf) throws IOException {
 		byte compressionTypeByte = raf.readByte();
 		CompressionType compressionType = CompressionType.getFromID(compressionTypeByte);
 		if (compressionType == null) {
 			throw new IOException("invalid compression type " + compressionTypeByte);
 		}
 		BufferedInputStream dis = new BufferedInputStream(compressionType.decompress(new FileInputStream(raf.getFD())));
 		NamedTag tag = new NBTDeserializer(false).fromStream(dis);
 		if (tag != null && tag.getTag() instanceof CompoundTag) {
 			data = (CompoundTag) tag.getTag();
 			initReferences();
 		} else {
 			throw new IOException("invalid data tag: " + (tag == null ? "null" : tag.getClass().getName()));
 		}
 	}

 	/**
 	 * @deprecated Use {@link #getBiomeAt(int, int, int)} instead
 	 */
 	@Deprecated
 	public int getBiomeAt(int blockX, int blockZ) {
 		if (dataVersion < 2202) {
 			if (biomes == null || biomes.length != 256) {
 				return -1;
 			}
 			return biomes[getBlockIndex(blockX, blockZ)];
 		} else {
 			throw new IllegalStateException("cannot get biome using Chunk#getBiomeAt(int,int) from biome data with DataVersion of 2202 or higher, use Chunk#getBiomeAt(int,int,int) instead");
 		}
 	}

 	/**
 	 * Fetches a biome id at a specific block in this chunk.
 	 * The coordinates can be absolute coordinates or relative to the region or chunk.
 	 * @param blockX The x-coordinate of the block.
 	 * @param blockY The y-coordinate of the block.
 	 * @param blockZ The z-coordinate of the block.
 	 * @return The biome id or -1 if the biomes are not correctly initialized.
 	 */
 	public int getBiomeAt(int blockX, int blockY, int blockZ) {
 		if (dataVersion < 2202) {
 			if (biomes == null || biomes.length != 256) {
 				return -1;
 			}
 			return biomes[getBlockIndex(blockX, blockZ)];
 		} else {
 			if (biomes == null || biomes.length != 1024) {
 				return -1;
 			}
 			int biomeX = (blockX & 0xF) >> 2;
 			int biomeY = (blockY & 0xF) >> 2;
 			int biomeZ = (blockZ & 0xF) >> 2;

 			return biomes[getBiomeIndex(biomeX, biomeY, biomeZ)];
 		}
 	}

 	@Deprecated
 	public void setBiomeAt(int blockX, int blockZ, int biomeID) {
 		if (dataVersion < 2202) {
 			if (biomes == null || biomes.length != 256) {
 				biomes = new int[256];
 				Arrays.fill(biomes, -1);
 			}
 			biomes[getBlockIndex(blockX, blockZ)] = biomeID;
 		} else {
 			if (biomes == null || biomes.length != 1024) {
 				biomes = new int[1024];
 				Arrays.fill(biomes, -1);
 			}

 			int biomeX = (blockX & 0xF) >> 2;
 			int biomeZ = (blockZ & 0xF) >> 2;

 			for (int y = 0; y < 64; y++) {
 				biomes[getBiomeIndex(biomeX, y, biomeZ)] = biomeID;
 			}
 		}
 	}

 	 /**
 	  * Sets a biome id at a specific block column.
 	  * The coordinates can be absolute coordinates or relative to the region or chunk.
 	  * @param blockX The x-coordinate of the block column.
 	  * @param blockZ The z-coordinate of the block column.
 	  * @param biomeID The biome id to be set.
 	  *                When set to a negative number, Minecraft will replace it with the block column's default biome.
 	  */
 	public void setBiomeAt(int blockX, int blockY, int blockZ, int biomeID) {
 		if (dataVersion < 2202) {
 			if (biomes == null || biomes.length != 256) {
 				biomes = new int[256];
 				Arrays.fill(biomes, -1);
 			}
 			biomes[getBlockIndex(blockX, blockZ)] = biomeID;
 		} else {
 			if (biomes == null || biomes.length != 1024) {
 				biomes = new int[1024];
 				Arrays.fill(biomes, -1);
 			}

 			int biomeX = (blockX & 0xF) >> 2;
 			int biomeZ = (blockZ & 0xF) >> 2;

 			biomes[getBiomeIndex(biomeX, blockY, biomeZ)] = biomeID;
 		}
 	}

 	int getBiomeIndex(int biomeX, int biomeY, int biomeZ) {
 		return biomeY * 64 + biomeZ * 4 + biomeX;
 	}

 	public CompoundTag getBlockStateAt(int blockX, int blockY, int blockZ) {
 		Section section = sections[MCAUtil.blockToChunk(blockY)];
 		if (section == null) {
 			return null;
 		}
 		return section.getBlockStateAt(blockX, blockY, blockZ);
 	}

 	/**
 	 * Sets a block state at a specific location.
 	 * The block coordinates can be absolute or relative to the region or chunk.
 	 * @param blockX The x-coordinate of the block.
 	 * @param blockY The y-coordinate of the block.
 	 * @param blockZ The z-coordinate of the block.
 	 * @param state The block state to be set.
 	 * @param cleanup When <code>true</code>, it will cleanup all palettes of this chunk.
 	 *                This option should only be used moderately to avoid unnecessary recalculation of the palette indices.
 	 *                Recalculating the Palette should only be executed once right before saving the Chunk to file.
 	 */
 	public void setBlockStateAt(int blockX, int blockY, int blockZ, CompoundTag state, boolean cleanup) {
 		int sectionIndex = MCAUtil.blockToChunk(blockY);
 		Section section = sections[sectionIndex];
 		if (section == null) {
 			section = sections[sectionIndex] = Section.newSection();
 		}
 		section.setBlockStateAt(blockX, blockY, blockZ, state, cleanup);
 	}

 	/**
 	 * @return The DataVersion of this chunk.
 	 */
 	public int getDataVersion() {
 		return dataVersion;
 	}

 	/**
 	 * Sets the DataVersion of this chunk. This does not check if the data of this chunk conforms
 	 * to that DataVersion, that is the responsibility of the developer.
 	 * @param dataVersion The DataVersion to be set.
 	 */
 	public void setDataVersion(int dataVersion) {
 		this.dataVersion = dataVersion;
 	}

 	/**
 	 * @return The timestamp when this region file was last updated in seconds since 1970-01-01.
 	 */
 	public int getLastMCAUpdate() {
 		return lastMCAUpdate;
 	}

 	/**
 	 * Sets the timestamp when this region file was last updated in seconds since 1970-01-01.
 	 * @param lastMCAUpdate The time in seconds since 1970-01-01.
 	 */
 	public void setLastMCAUpdate(int lastMCAUpdate) {
 		this.lastMCAUpdate = lastMCAUpdate;
 	}

 	/**
 	 * @return The generation station of this chunk.
 	 */
 	public String getStatus() {
 		return status;
 	}

 	/**
 	 * Sets the generation status of this chunk.
 	 * @param status The generation status of this chunk.
 	 */
 	public void setStatus(String status) {
 		this.status = status;
 	}

 	/**
 	 * Fetches the section at the given y-coordinate.
 	 * @param sectionY The y-coordinate of the section in this chunk ranging from 0 to 15.
 	 * @return The Section.
 	 */
 	public Section getSection(int sectionY) {
 		return sections[sectionY];
 	}

 	/**
 	 * Sets a section at a givesn y-coordinate
 	 * @param sectionY The y-coordinate of the section in this chunk ranging from 0 to 15.
 	 * @param section The section to be set.
 	 */
 	public void setSection(int sectionY, Section section) {
 		sections[sectionY] = section;
 	}

 	/**
 	 * @return The timestamp when this chunk was last updated as a UNIX timestamp.
 	 */
 	public long getLastUpdate() {
 		return lastUpdate;
 	}

 	/**
 	 * Sets the time when this chunk was last updated as a UNIX timestamp.
 	 * @param lastUpdate The UNIX timestamp.
 	 */
 	public void setLastUpdate(long lastUpdate) {
 		this.lastUpdate = lastUpdate;
 	}

 	/**
 	 * @return The cumulative amount of time players have spent in this chunk in ticks.
 	 */
 	public long getInhabitedTime() {
 		return inhabitedTime;
 	}

 	/**
 	 * Sets the cumulative amount of time players have spent in this chunk in ticks.
 	 * @param inhabitedTime The time in ticks.
 	 */
 	public void setInhabitedTime(long inhabitedTime) {
 		this.inhabitedTime = inhabitedTime;
 	}

 	/**
 	 * @return A matrix of biome IDs for all block columns in this chunk.
 	 */
 	public int[] getBiomes() {
 		return biomes;
 	}

 	/**
 	 * Sets the biome IDs for this chunk.
 	 * @param biomes The biome ID matrix of this chunk. Must have a length of <code>256</code>.
 	 * @throws IllegalArgumentException When the biome matrix does not have a length of <code>256</code>
 	 *                                  or is <code>null</code>
 	 */
 	public void setBiomes(int[] biomes) {
 		if (biomes != null) {
 			if (dataVersion < 2202 && biomes.length != 256 || dataVersion >= 2202 && biomes.length != 1024) {
 				throw new IllegalArgumentException("biomes array must have a length of " + (dataVersion < 2202 ? "256" : "1024"));
 			}
 		}
 		this.biomes = biomes;
 	}

 	/**
 	 * @return The height maps of this chunk.
 	 */
 	public CompoundTag getHeightMaps() {
 		return heightMaps;
 	}

 	/**
 	 * Sets the height maps of this chunk.
 	 * @param heightMaps The height maps.
 	 */
 	public void setHeightMaps(CompoundTag heightMaps) {
 		this.heightMaps = heightMaps;
 	}

 	/**
 	 * @return The carving masks of this chunk.
 	 */
 	public CompoundTag getCarvingMasks() {
 		return carvingMasks;
 	}

 	/**
 	 * Sets the carving masks of this chunk.
 	 * @param carvingMasks The carving masks.
 	 */
 	public void setCarvingMasks(CompoundTag carvingMasks) {
 		this.carvingMasks = carvingMasks;
 	}

 	/**
 	 * @return The entities of this chunk.
 	 */
 	public ListTag<CompoundTag> getEntities() {
 		return entities;
 	}

 	/**
 	 * Sets the entities of this chunk.
 	 * @param entities The entities.
 	 */
 	public void setEntities(ListTag<CompoundTag> entities) {
 		this.entities = entities;
 	}

 	/**
 	 * @return The tile entities of this chunk.
 	 */
 	public ListTag<CompoundTag> getTileEntities() {
 		return tileEntities;
 	}

 	/**
 	 * Sets the tile entities of this chunk.
 	 * @param tileEntities The tile entities of this chunk.
 	 */
 	public void setTileEntities(ListTag<CompoundTag> tileEntities) {
 		this.tileEntities = tileEntities;
 	}

 	/**
 	 * @return The tile ticks of this chunk.
 	 */
 	public ListTag<CompoundTag> getTileTicks() {
 		return tileTicks;
 	}

 	/**
 	 * Sets the tile ticks of this chunk.
 	 * @param tileTicks Thee tile ticks.
 	 */
 	public void setTileTicks(ListTag<CompoundTag> tileTicks) {
 		this.tileTicks = tileTicks;
 	}

 	/**
 	 * @return The liquid ticks of this chunk.
 	 */
 	public ListTag<CompoundTag> getLiquidTicks() {
 		return liquidTicks;
 	}

 	/**
 	 * Sets the liquid ticks of this chunk.
 	 * @param liquidTicks The liquid ticks.
 	 */
 	public void setLiquidTicks(ListTag<CompoundTag> liquidTicks) {
 		this.liquidTicks = liquidTicks;
 	}

 	/**
 	 * @return The light sources in this chunk.
 	 */
 	public ListTag<ListTag<?>> getLights() {
 		return lights;
 	}

 	/**
 	 * Sets the light sources in this chunk.
 	 * @param lights The light sources.
 	 */
 	public void setLights(ListTag<ListTag<?>> lights) {
 		this.lights = lights;
 	}

 	/**
 	 * @return THe liquids to be ticked in this chunk.
 	 */
 	public ListTag<ListTag<?>> getLiquidsToBeTicked() {
 		return liquidsToBeTicked;
 	}

 	/**
 	 * Sets the liquids to be ticked in this chunk.
 	 * @param liquidsToBeTicked The liquids to be ticked.
 	 */
 	public void setLiquidsToBeTicked(ListTag<ListTag<?>> liquidsToBeTicked) {
 		this.liquidsToBeTicked = liquidsToBeTicked;
 	}

 	/**
 	 * @return Stuff to be ticked in this chunk.
 	 */
 	public ListTag<ListTag<?>> getToBeTicked() {
 		return toBeTicked;
 	}

 	/**
 	 * Sets stuff to be ticked in this chunk.
 	 * @param toBeTicked The stuff to be ticked.
 	 */
 	public void setToBeTicked(ListTag<ListTag<?>> toBeTicked) {
 		this.toBeTicked = toBeTicked;
 	}

 	/**
 	 * @return Things that are in post processing in this chunk.
 	 */
 	public ListTag<ListTag<?>> getPostProcessing() {
 		return postProcessing;
 	}

 	/**
 	 * Sets things to be post processed in this chunk.
 	 * @param postProcessing The things to be post processed.
 	 */
 	public void setPostProcessing(ListTag<ListTag<?>> postProcessing) {
 		this.postProcessing = postProcessing;
 	}

 	/**
 	 * @return Data about structures in this chunk.
 	 */
 	public CompoundTag getStructures() {
 		return structures;
 	}

 	/**
 	 * Sets data about structures in this chunk.
 	 * @param structures The data about structures.
 	 */
 	public void setStructures(CompoundTag structures) {
 		this.structures = structures;
 	}

 	int getBlockIndex(int blockX, int blockZ) {
 		return (blockZ & 0xF) * 16 + (blockX & 0xF);
 	}

 	public void cleanupPalettesAndBlockStates() {
 		for (Section section : sections) {
 			if (section != null) {
 				section.cleanupPaletteAndBlockStates();
 			}
 		}
 	}

 	public static Chunk newChunk() {
 		Chunk c = new Chunk(0);
 		c.dataVersion = DEFAULT_DATA_VERSION;
 		c.data = new CompoundTag();
 		c.data.put("Level", new CompoundTag());
 		c.status = "mobs_spawned";
 		return c;
 	}

 	public CompoundTag updateHandle(int xPos, int zPos) {
 		data.putInt("DataVersion", dataVersion);
 		CompoundTag level = data.getCompoundTag("Level");
 		level.putInt("xPos", xPos);
 		level.putInt("zPos", zPos);
 		level.putLong("LastUpdate", lastUpdate);
 		level.putLong("InhabitedTime", inhabitedTime);
 		if (dataVersion < 2202) {
 			if (biomes != null && biomes.length == 256) level.putIntArray("Biomes", biomes);
 		} else {
 			if (biomes != null && biomes.length == 1024) level.putIntArray("Biomes", biomes);
 		}
 		if (heightMaps != null) level.put("HeightMaps", heightMaps);
 		if (carvingMasks != null) level.put("CarvingMasks", carvingMasks);
 		if (entities != null) level.put("Entities", entities);
 		if (tileEntities != null) level.put("TileEntities", tileEntities);
 		if (tileTicks != null) level.put("TileTicks", tileTicks);
 		if (liquidTicks != null) level.put("LiquidTicks", liquidTicks);
 		if (lights != null) level.put("Lights", lights);
 		if (liquidsToBeTicked != null) level.put("LiquidsToBeTicked", liquidsToBeTicked);
 		if (toBeTicked != null) level.put("ToBeTicked", toBeTicked);
 		if (postProcessing != null) level.put("PostProcessing", postProcessing);
 		level.putString("Status", status);
 		if (structures != null) level.put("Structures", structures);
 		ListTag<CompoundTag> sections = new ListTag<>(CompoundTag.class);
 		for (int i = 0; i < this.sections.length; i++) {
 			if (this.sections[i] != null) {
 				sections.add(this.sections[i].updateHandle(i));
 			}
 		}
 		level.put("Sections", sections);
 		return data;
 	}
 }
	package net.querz.mca;

	import net.querz.nbt.tag.CompoundTag;
	import net.querz.nbt.tag.ListTag;
	import net.querz.nbt.io.NamedTag;
	import net.querz.nbt.io.NBTDeserializer;
	import net.querz.nbt.io.NBTSerializer;
	import java.io.BufferedInputStream;
	import java.io.BufferedOutputStream;
	import java.io.ByteArrayOutputStream;
	import java.io.FileInputStream;
	import java.io.IOException;
	import java.io.RandomAccessFile;
	import java.util.Arrays;

	public class Chunk {

	public static final int DEFAULT_DATA_VERSION = 1628;

	private int lastMCAUpdate;

	private CompoundTag data;

	private int dataVersion;
	private long lastUpdate;
	private long inhabitedTime;
	private int[] biomes;
	private CompoundTag heightMaps;
	private CompoundTag carvingMasks;
	private Section[] sections = new Section[16]; //always initialized with size = 16 for fast access
	private ListTag<CompoundTag> entities;
	private ListTag<CompoundTag> tileEntities;
	private ListTag<CompoundTag> tileTicks;
	private ListTag<CompoundTag> liquidTicks;
	private ListTag<ListTag<?>> lights;
	private ListTag<ListTag<?>> liquidsToBeTicked;
	private ListTag<ListTag<?>> toBeTicked;
	private ListTag<ListTag<?>> postProcessing;
	private String status;
	private CompoundTag structures;

	Chunk(int lastMCAUpdate) {
	this.lastMCAUpdate = lastMCAUpdate;
	}

	/**
	* Create a new chunk based on raw base data from a region file.
	* @param data The raw base data to be used.
	*/
	public Chunk(CompoundTag data) {
	this.data = data;
	initReferences();
	}

	private void initReferences() {
	if (data == null) {
	throw new NullPointerException("data cannot be null");
	}
	CompoundTag level;
	if ((level = data.getCompoundTag("Level")) == null) {
	throw new IllegalArgumentException("data does not contain \"Level\" tag");
	}
	this.dataVersion = data.getInt("DataVersion");
	this.inhabitedTime = level.getLong("InhabitedTime");
	this.lastUpdate = level.getLong("LastUpdate");
	this.biomes = level.getIntArray("Biomes");
	this.heightMaps = level.getCompoundTag("HeightMaps");
	this.carvingMasks = level.getCompoundTag("CarvingMasks");
	this.entities = level.containsKey("Entities") ? level.getListTag("Entities").asCompoundTagList() : null;
	this.tileEntities = level.containsKey("TileEntities") ? level.getListTag("TileEntities").asCompoundTagList() : null;
	this.tileTicks = level.containsKey("TileTicks") ? level.getListTag("TileTicks").asCompoundTagList() : null;
	this.liquidTicks = level.containsKey("LiquidTicks") ? level.getListTag("LiquidTicks").asCompoundTagList() : null;
	this.lights = level.containsKey("Lights") ? level.getListTag("Lights").asListTagList() : null;
	this.liquidsToBeTicked = level.containsKey("LiquidsToBeTicked") ? level.getListTag("LiquidsToBeTicked").asListTagList() : null;
	this.toBeTicked = level.containsKey("ToBeTicked") ? level.getListTag("ToBeTicked").asListTagList() : null;
	this.postProcessing = level.containsKey("PostProcessing") ? level.getListTag("PostProcessing").asListTagList() : null;
	this.status = level.getString("Status");
	this.structures = level.getCompoundTag("Structures");
	if (level.containsKey("Sections")) {
	for (CompoundTag section : level.getListTag("Sections").asCompoundTagList()) {
	int sectionIndex = section.getByte("Y");
	if (sectionIndex > 15 \|\| sectionIndex < 0) {
	continue;
	}
	Section newSection = new Section(section, dataVersion);
	if (newSection.isEmpty()) {
	continue;
	}

	this.sections[sectionIndex] = newSection;
	}
	}
	}

	/**
	* Serializes this chunk to a <code>RandomAccessFile</code>.
	* @param raf The RandomAccessFile to be written to.
	* @param xPos The x-coordinate of the chunk.
	* @param zPos The z-coodrinate of the chunk.
	* @return The amount of bytes written to the RandomAccessFile.
	* @throws IOException When something went wrong during writing.
	*/
	public int serialize(RandomAccessFile raf, int xPos, int zPos) throws IOException {
	ByteArrayOutputStream baos = new ByteArrayOutputStream(4096);
	try (BufferedOutputStream nbtOut = new BufferedOutputStream(CompressionType.ZLIB.compress(baos))) {
	new NBTSerializer(false).toStream(new NamedTag(null, updateHandle(xPos, zPos)), nbtOut);
	}
	byte[] rawData = baos.toByteArray();
	raf.writeInt(rawData.length + 1); // including the byte to store the compression type
	raf.writeByte(CompressionType.ZLIB.getID());
	raf.write(rawData);
	return rawData.length + 5;
	}

	/**
	* Reads chunk data from a RandomAccessFile. The RandomAccessFile must already be at the correct position.
	* @param raf The RandomAccessFile to read the chunk data from.
	* @throws IOException When something went wrong during reading.
	*/
	public void deserialize(RandomAccessFile raf) throws IOException {
	byte compressionTypeByte = raf.readByte();
	CompressionType compressionType = CompressionType.getFromID(compressionTypeByte);
	if (compressionType == null) {
	throw new IOException("invalid compression type " + compressionTypeByte);
	}
	BufferedInputStream dis = new BufferedInputStream(compressionType.decompress(new FileInputStream(raf.getFD())));
	NamedTag tag = new NBTDeserializer(false).fromStream(dis);
	if (tag != null && tag.getTag() instanceof CompoundTag) {
	data = (CompoundTag) tag.getTag();
	initReferences();
	} else {
	throw new IOException("invalid data tag: " + (tag == null ? "null" : tag.getClass().getName()));
	}
	}

	/**
	* @deprecated Use {@link #getBiomeAt(int, int, int)} instead
	*/
	@Deprecated
	public int getBiomeAt(int blockX, int blockZ) {
	if (dataVersion < 2202) {
	if (biomes == null \|\| biomes.length != 256) {
	return -1;
	}
	return biomes[getBlockIndex(blockX, blockZ)];
	} else {
	throw new IllegalStateException("cannot get biome using Chunk#getBiomeAt(int,int) from biome data with DataVersion of 2202 or higher, use Chunk#getBiomeAt(int,int,int) instead");
	}
	}

	/**
	* Fetches a biome id at a specific block in this chunk.
	* The coordinates can be absolute coordinates or relative to the region or chunk.
	* @param blockX The x-coordinate of the block.
	* @param blockY The y-coordinate of the block.
	* @param blockZ The z-coordinate of the block.
	* @return The biome id or -1 if the biomes are not correctly initialized.
	*/
	public int getBiomeAt(int blockX, int blockY, int blockZ) {
	if (dataVersion < 2202) {
	if (biomes == null \|\| biomes.length != 256) {
	return -1;
	}
	return biomes[getBlockIndex(blockX, blockZ)];
	} else {
	if (biomes == null \|\| biomes.length != 1024) {
	return -1;
	}
	int biomeX = (blockX & 0xF) >> 2;
	int biomeY = (blockY & 0xF) >> 2;
	int biomeZ = (blockZ & 0xF) >> 2;

	return biomes[getBiomeIndex(biomeX, biomeY, biomeZ)];
	}
	}

	@Deprecated
	public void setBiomeAt(int blockX, int blockZ, int biomeID) {
	if (dataVersion < 2202) {
	if (biomes == null \|\| biomes.length != 256) {
	biomes = new int[256];
	Arrays.fill(biomes, -1);
	}
	biomes[getBlockIndex(blockX, blockZ)] = biomeID;
	} else {
	if (biomes == null \|\| biomes.length != 1024) {
	biomes = new int[1024];
	Arrays.fill(biomes, -1);
	}

	int biomeX = (blockX & 0xF) >> 2;
	int biomeZ = (blockZ & 0xF) >> 2;

	for (int y = 0; y < 64; y++) {
	biomes[getBiomeIndex(biomeX, y, biomeZ)] = biomeID;
	}
	}
	}

	/**
	* Sets a biome id at a specific block column.
	* The coordinates can be absolute coordinates or relative to the region or chunk.
	* @param blockX The x-coordinate of the block column.
	* @param blockZ The z-coordinate of the block column.
	* @param biomeID The biome id to be set.
	* When set to a negative number, Minecraft will replace it with the block column's default biome.
	*/
	public void setBiomeAt(int blockX, int blockY, int blockZ, int biomeID) {
	if (dataVersion < 2202) {
	if (biomes == null \|\| biomes.length != 256) {
	biomes = new int[256];
	Arrays.fill(biomes, -1);
	}
	biomes[getBlockIndex(blockX, blockZ)] = biomeID;
	} else {
	if (biomes == null \|\| biomes.length != 1024) {
	biomes = new int[1024];
	Arrays.fill(biomes, -1);
	}

	int biomeX = (blockX & 0xF) >> 2;
	int biomeZ = (blockZ & 0xF) >> 2;

	biomes[getBiomeIndex(biomeX, blockY, biomeZ)] = biomeID;
	}
	}

	int getBiomeIndex(int biomeX, int biomeY, int biomeZ) {
	return biomeY * 64 + biomeZ * 4 + biomeX;
	}

	public CompoundTag getBlockStateAt(int blockX, int blockY, int blockZ) {
	Section section = sections[MCAUtil.blockToChunk(blockY)];
	if (section == null) {
	return null;
	}
	return section.getBlockStateAt(blockX, blockY, blockZ);
	}

	/**
	* Sets a block state at a specific location.
	* The block coordinates can be absolute or relative to the region or chunk.
	* @param blockX The x-coordinate of the block.
	* @param blockY The y-coordinate of the block.
	* @param blockZ The z-coordinate of the block.
	* @param state The block state to be set.
	* @param cleanup When <code>true</code>, it will cleanup all palettes of this chunk.
	* This option should only be used moderately to avoid unnecessary recalculation of the palette indices.
	* Recalculating the Palette should only be executed once right before saving the Chunk to file.
	*/
	public void setBlockStateAt(int blockX, int blockY, int blockZ, CompoundTag state, boolean cleanup) {
	int sectionIndex = MCAUtil.blockToChunk(blockY);
	Section section = sections[sectionIndex];
	if (section == null) {
	section = sections[sectionIndex] = Section.newSection();
	}
	section.setBlockStateAt(blockX, blockY, blockZ, state, cleanup);
	}

	/**
	* @return The DataVersion of this chunk.
	*/
	public int getDataVersion() {
	return dataVersion;
	}

	/**
	* Sets the DataVersion of this chunk. This does not check if the data of this chunk conforms
	* to that DataVersion, that is the responsibility of the developer.
	* @param dataVersion The DataVersion to be set.
	*/
	public void setDataVersion(int dataVersion) {
	this.dataVersion = dataVersion;
	}

	/**
	* @return The timestamp when this region file was last updated in seconds since 1970-01-01.
	*/
	public int getLastMCAUpdate() {
	return lastMCAUpdate;
	}

	/**
	* Sets the timestamp when this region file was last updated in seconds since 1970-01-01.
	* @param lastMCAUpdate The time in seconds since 1970-01-01.
	*/
	public void setLastMCAUpdate(int lastMCAUpdate) {
	this.lastMCAUpdate = lastMCAUpdate;
	}

	/**
	* @return The generation station of this chunk.
	*/
	public String getStatus() {
	return status;
	}

	/**
	* Sets the generation status of this chunk.
	* @param status The generation status of this chunk.
	*/
	public void setStatus(String status) {
	this.status = status;
	}

	/**
	* Fetches the section at the given y-coordinate.
	* @param sectionY The y-coordinate of the section in this chunk ranging from 0 to 15.
	* @return The Section.
	*/
	public Section getSection(int sectionY) {
	return sections[sectionY];
	}

	/**
	* Sets a section at a givesn y-coordinate
	* @param sectionY The y-coordinate of the section in this chunk ranging from 0 to 15.
	* @param section The section to be set.
	*/
	public void setSection(int sectionY, Section section) {
	sections[sectionY] = section;
	}

	/**
	* @return The timestamp when this chunk was last updated as a UNIX timestamp.
	*/
	public long getLastUpdate() {
	return lastUpdate;
	}

	/**
	* Sets the time when this chunk was last updated as a UNIX timestamp.
	* @param lastUpdate The UNIX timestamp.
	*/
	public void setLastUpdate(long lastUpdate) {
	this.lastUpdate = lastUpdate;
	}

	/**
	* @return The cumulative amount of time players have spent in this chunk in ticks.
	*/
	public long getInhabitedTime() {
	return inhabitedTime;
	}

	/**
	* Sets the cumulative amount of time players have spent in this chunk in ticks.
	* @param inhabitedTime The time in ticks.
	*/
	public void setInhabitedTime(long inhabitedTime) {
	this.inhabitedTime = inhabitedTime;
	}

	/**
	* @return A matrix of biome IDs for all block columns in this chunk.
	*/
	public int[] getBiomes() {
	return biomes;
	}

	/**
	* Sets the biome IDs for this chunk.
	* @param biomes The biome ID matrix of this chunk. Must have a length of <code>256</code>.
	* @throws IllegalArgumentException When the biome matrix does not have a length of <code>256</code>
	* or is <code>null</code>
	*/
	public void setBiomes(int[] biomes) {
	if (biomes != null) {
	if (dataVersion < 2202 && biomes.length != 256 \|\| dataVersion >= 2202 && biomes.length != 1024) {
	throw new IllegalArgumentException("biomes array must have a length of " + (dataVersion < 2202 ? "256" : "1024"));
	}
	}
	this.biomes = biomes;
	}

	/**
	* @return The height maps of this chunk.
	*/
	public CompoundTag getHeightMaps() {
	return heightMaps;
	}

	/**
	* Sets the height maps of this chunk.
	* @param heightMaps The height maps.
	*/
	public void setHeightMaps(CompoundTag heightMaps) {
	this.heightMaps = heightMaps;
	}

	/**
	* @return The carving masks of this chunk.
	*/
	public CompoundTag getCarvingMasks() {
	return carvingMasks;
	}

	/**
	* Sets the carving masks of this chunk.
	* @param carvingMasks The carving masks.
	*/
	public void setCarvingMasks(CompoundTag carvingMasks) {
	this.carvingMasks = carvingMasks;
	}

	/**
	* @return The entities of this chunk.
	*/
	public ListTag<CompoundTag> getEntities() {
	return entities;
	}

	/**
	* Sets the entities of this chunk.
	* @param entities The entities.
	*/
	public void setEntities(ListTag<CompoundTag> entities) {
	this.entities = entities;
	}

	/**
	* @return The tile entities of this chunk.
	*/
	public ListTag<CompoundTag> getTileEntities() {
	return tileEntities;
	}

	/**
	* Sets the tile entities of this chunk.
	* @param tileEntities The tile entities of this chunk.
	*/
	public void setTileEntities(ListTag<CompoundTag> tileEntities) {
	this.tileEntities = tileEntities;
	}

	/**
	* @return The tile ticks of this chunk.
	*/
	public ListTag<CompoundTag> getTileTicks() {
	return tileTicks;
	}

	/**
	* Sets the tile ticks of this chunk.
	* @param tileTicks Thee tile ticks.
	*/
	public void setTileTicks(ListTag<CompoundTag> tileTicks) {
	this.tileTicks = tileTicks;
	}

	/**
	* @return The liquid ticks of this chunk.
	*/
	public ListTag<CompoundTag> getLiquidTicks() {
	return liquidTicks;
	}

	/**
	* Sets the liquid ticks of this chunk.
	* @param liquidTicks The liquid ticks.
	*/
	public void setLiquidTicks(ListTag<CompoundTag> liquidTicks) {
	this.liquidTicks = liquidTicks;
	}

	/**
	* @return The light sources in this chunk.
	*/
	public ListTag<ListTag<?>> getLights() {
	return lights;
	}

	/**
	* Sets the light sources in this chunk.
	* @param lights The light sources.
	*/
	public void setLights(ListTag<ListTag<?>> lights) {
	this.lights = lights;
	}

	/**
	* @return THe liquids to be ticked in this chunk.
	*/
	public ListTag<ListTag<?>> getLiquidsToBeTicked() {
	return liquidsToBeTicked;
	}

	/**
	* Sets the liquids to be ticked in this chunk.
	* @param liquidsToBeTicked The liquids to be ticked.
	*/
	public void setLiquidsToBeTicked(ListTag<ListTag<?>> liquidsToBeTicked) {
	this.liquidsToBeTicked = liquidsToBeTicked;
	}

	/**
	* @return Stuff to be ticked in this chunk.
	*/
	public ListTag<ListTag<?>> getToBeTicked() {
	return toBeTicked;
	}

	/**
	* Sets stuff to be ticked in this chunk.
	* @param toBeTicked The stuff to be ticked.
	*/
	public void setToBeTicked(ListTag<ListTag<?>> toBeTicked) {
	this.toBeTicked = toBeTicked;
	}

	/**
	* @return Things that are in post processing in this chunk.
	*/
	public ListTag<ListTag<?>> getPostProcessing() {
	return postProcessing;
	}

	/**
	* Sets things to be post processed in this chunk.
	* @param postProcessing The things to be post processed.
	*/
	public void setPostProcessing(ListTag<ListTag<?>> postProcessing) {
	this.postProcessing = postProcessing;
	}

	/**
	* @return Data about structures in this chunk.
	*/
	public CompoundTag getStructures() {
	return structures;
	}

	/**
	* Sets data about structures in this chunk.
	* @param structures The data about structures.
	*/
	public void setStructures(CompoundTag structures) {
	this.structures = structures;
	}

	int getBlockIndex(int blockX, int blockZ) {
	return (blockZ & 0xF) * 16 + (blockX & 0xF);
	}

	public void cleanupPalettesAndBlockStates() {
	for (Section section : sections) {
	if (section != null) {
	section.cleanupPaletteAndBlockStates();
	}
	}
	}

	public static Chunk newChunk() {
	Chunk c = new Chunk(0);
	c.dataVersion = DEFAULT_DATA_VERSION;
	c.data = new CompoundTag();
	c.data.put("Level", new CompoundTag());
	c.status = "mobs_spawned";
	return c;
	}

	public CompoundTag updateHandle(int xPos, int zPos) {
	data.putInt("DataVersion", dataVersion);
	CompoundTag level = data.getCompoundTag("Level");
	level.putInt("xPos", xPos);
	level.putInt("zPos", zPos);
	level.putLong("LastUpdate", lastUpdate);
	level.putLong("InhabitedTime", inhabitedTime);
	if (dataVersion < 2202) {
	if (biomes != null && biomes.length == 256) level.putIntArray("Biomes", biomes);
	} else {
	if (biomes != null && biomes.length == 1024) level.putIntArray("Biomes", biomes);
	}
	if (heightMaps != null) level.put("HeightMaps", heightMaps);
	if (carvingMasks != null) level.put("CarvingMasks", carvingMasks);
	if (entities != null) level.put("Entities", entities);
	if (tileEntities != null) level.put("TileEntities", tileEntities);
	if (tileTicks != null) level.put("TileTicks", tileTicks);
	if (liquidTicks != null) level.put("LiquidTicks", liquidTicks);
	if (lights != null) level.put("Lights", lights);
	if (liquidsToBeTicked != null) level.put("LiquidsToBeTicked", liquidsToBeTicked);
	if (toBeTicked != null) level.put("ToBeTicked", toBeTicked);
	if (postProcessing != null) level.put("PostProcessing", postProcessing);
	level.putString("Status", status);
	if (structures != null) level.put("Structures", structures);
	ListTag<CompoundTag> sections = new ListTag<>(CompoundTag.class);
	for (int i = 0; i < this.sections.length; i++) {
	if (this.sections[i] != null) {
	sections.add(this.sections[i].updateHandle(i));
	}
	}
	level.put("Sections", sections);
	return data;
	}
	}