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86
common/src/main/java/org/popcraft/chunky/util/RegionFile.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| package org.popcraft.chunky.util; | ||
|
|
||
| import com.google.gson.reflect.TypeToken; | ||
| import de.bluecolored.bluenbt.BlueNBT; | ||
| import de.bluecolored.bluenbt.NBTName; | ||
| import org.popcraft.chunky.nbt.util.ChunkPos; | ||
|
|
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| import java.io.ByteArrayInputStream; | ||
| import java.io.DataInputStream; | ||
| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.io.RandomAccessFile; | ||
| import java.util.Collection; | ||
| import java.util.HashMap; | ||
| import java.util.HashSet; | ||
| import java.util.Map; | ||
| import java.util.Optional; | ||
| import java.util.Set; | ||
| import java.util.zip.InflaterInputStream; | ||
|
|
||
| public final class RegionFile { | ||
| private static final int ENTRIES = 1024; | ||
| private static final int SECTOR_SIZE = 4096; | ||
| private final Set<Chunk> chunks = new HashSet<>(); | ||
| private final Map<ChunkPos, Chunk> chunkMap = new HashMap<>(); | ||
|
|
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| public RegionFile(final File file) { | ||
| final BlueNBT blueNBT = new BlueNBT(); | ||
| try (final RandomAccessFile region = new RandomAccessFile(file, "r")) { | ||
| if (region.length() < 4096) { | ||
| return; | ||
| } | ||
| final int[] offsetTable = new int[ENTRIES]; | ||
| final int[] sizeTable = new int[ENTRIES]; | ||
| for (int i = 0; i < ENTRIES; ++i) { | ||
| final int location = region.readInt(); | ||
| offsetTable[i] = (location >> 8) & 0xFFFFFF; | ||
| sizeTable[i] = location & 0xFF; | ||
| } | ||
| final int[] timestampTable = new int[ENTRIES]; | ||
| for (int i = 0; i < ENTRIES; ++i) { | ||
| timestampTable[i] = region.readInt(); | ||
| } | ||
| for (int i = 0; i < ENTRIES; ++i) { | ||
| final int offset = offsetTable[i] * SECTOR_SIZE; | ||
| final int size = sizeTable[i] * SECTOR_SIZE; | ||
| if (offset == 0 && size == 0) { | ||
| continue; | ||
| } | ||
| region.seek(offset); | ||
| final int length = region.readInt(); | ||
| final byte compressionType = region.readByte(); | ||
| if (compressionType != 2) { | ||
| throw new UnsupportedOperationException("Not in zlib format"); | ||
| } | ||
| final byte[] compressed = new byte[length - 1]; | ||
| region.readFully(compressed); | ||
| final DataInputStream input = new DataInputStream(new InflaterInputStream(new ByteArrayInputStream(compressed))); | ||
| final Chunk chunk = blueNBT.read(input, TypeToken.get(Chunk.class)); | ||
| chunks.add(chunk); | ||
| } | ||
| } catch (IOException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| for (final Chunk chunk : chunks) { | ||
| chunkMap.put(ChunkPos.of(chunk.x, chunk.z), chunk); | ||
| } | ||
| } | ||
|
|
||
| public Collection<Chunk> getChunks() { | ||
| return chunks; | ||
| } | ||
|
|
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| public Optional<Chunk> getChunk(final int x, final int z) { | ||
| return Optional.ofNullable(chunkMap.get(ChunkPos.of(x, z))); | ||
| } | ||
|
|
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| public static class Chunk { | ||
| @NBTName("xPos") | ||
| public int x; | ||
| @NBTName("zPos") | ||
| public int z; | ||
| @NBTName("InhabitedTime") | ||
| public long inhabitedTime = -1; | ||
| } | ||
| } |