package net.minecraft.world.chunk.storage;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.InflaterInputStream;
public class RegionFile
{
private static final byte[] emptySector = new byte[4096];
private final File fileName;
private RandomAccessFile dataFile;
private final int[] offsets = new int[1024];
private final int[] chunkTimestamps = new int[1024];
private ArrayList sectorFree;
/** McRegion sizeDelta */
private int sizeDelta;
private long lastModified = 0L;
public RegionFile(File par1File)
{
this.fileName = par1File;
this.sizeDelta = 0;
try
{
if (par1File.exists())
{
this.lastModified = par1File.lastModified();
}
this.dataFile = new RandomAccessFile(par1File, "rw");
int var2;
if (this.dataFile.length() < 4096L)
{
for (var2 = 0; var2 < 1024; ++var2)
{
this.dataFile.writeInt(0);
}
for (var2 = 0; var2 < 1024; ++var2)
{
this.dataFile.writeInt(0);
}
this.sizeDelta += 8192;
}
if ((this.dataFile.length() & 4095L) != 0L)
{
for (var2 = 0; (long)var2 < (this.dataFile.length() & 4095L); ++var2)
{
this.dataFile.write(0);
}
}
var2 = (int)this.dataFile.length() / 4096;
this.sectorFree = new ArrayList(var2);
int var3;
for (var3 = 0; var3 < var2; ++var3)
{
this.sectorFree.add(Boolean.valueOf(true));
}
this.sectorFree.set(0, Boolean.valueOf(false));
this.sectorFree.set(1, Boolean.valueOf(false));
this.dataFile.seek(0L);
int var4;
for (var3 = 0; var3 < 1024; ++var3)
{
var4 = this.dataFile.readInt();
this.offsets[var3] = var4;
if (var4 != 0 && (var4 >> 8) + (var4 & 255) <= this.sectorFree.size())
{
for (int var5 = 0; var5 < (var4 & 255); ++var5)
{
this.sectorFree.set((var4 >> 8) + var5, Boolean.valueOf(false));
}
}
}
for (var3 = 0; var3 < 1024; ++var3)
{
var4 = this.dataFile.readInt();
this.chunkTimestamps[var3] = var4;
}
}
catch (IOException var6)
{
var6.printStackTrace();
}
}
/**
* args: x, y - get uncompressed chunk stream from the region file
*/
public synchronized DataInputStream getChunkDataInputStream(int par1, int par2)
{
if (this.outOfBounds(par1, par2))
{
return null;
}
else
{
try
{
int var3 = this.getOffset(par1, par2);
if (var3 == 0)
{
return null;
}
else
{
int var4 = var3 >> 8;
int var5 = var3 & 255;
if (var4 + var5 > this.sectorFree.size())
{
return null;
}
else
{
this.dataFile.seek((long)(var4 * 4096));
int var6 = this.dataFile.readInt();
if (var6 > 4096 * var5)
{
return null;
}
else if (var6 <= 0)
{
return null;
}
else
{
byte var7 = this.dataFile.readByte();
byte[] var8;
if (var7 == 1)
{
var8 = new byte[var6 - 1];
this.dataFile.read(var8);
return new DataInputStream(new BufferedInputStream(new GZIPInputStream(new ByteArrayInputStream(var8))));
}
else if (var7 == 2)
{
var8 = new byte[var6 - 1];
this.dataFile.read(var8);
return new DataInputStream(new BufferedInputStream(new InflaterInputStream(new ByteArrayInputStream(var8))));
}
else
{
return null;
}
}
}
}
}
catch (IOException var9)
{
return null;
}
}
}
/**
* args: x, z - get an output stream used to write chunk data, data is on disk when the returned stream is closed
*/
public DataOutputStream getChunkDataOutputStream(int par1, int par2)
{
return this.outOfBounds(par1, par2) ? null : new DataOutputStream(new DeflaterOutputStream(new RegionFileChunkBuffer(this, par1, par2)));
}
/**
* args: x, z, data, length - write chunk data at (x, z) to disk
*/
protected synchronized void write(int par1, int par2, byte[] par3ArrayOfByte, int par4)
{
try
{
int var5 = this.getOffset(par1, par2);
int var6 = var5 >> 8;
int var7 = var5 & 255;
int var8 = (par4 + 5) / 4096 + 1;
if (var8 >= 256)
{
return;
}
if (var6 != 0 && var7 == var8)
{
this.write(var6, par3ArrayOfByte, par4);
}
else
{
int var9;
for (var9 = 0; var9 < var7; ++var9)
{
this.sectorFree.set(var6 + var9, Boolean.valueOf(true));
}
var9 = this.sectorFree.indexOf(Boolean.valueOf(true));
int var10 = 0;
int var11;
if (var9 != -1)
{
for (var11 = var9; var11 < this.sectorFree.size(); ++var11)
{
if (var10 != 0)
{
if (((Boolean)this.sectorFree.get(var11)).booleanValue())
{
++var10;
}
else
{
var10 = 0;
}
}
else if (((Boolean)this.sectorFree.get(var11)).booleanValue())
{
var9 = var11;
var10 = 1;
}
if (var10 >= var8)
{
break;
}
}
}
if (var10 >= var8)
{
var6 = var9;
this.setOffset(par1, par2, var9 << 8 | var8);
for (var11 = 0; var11 < var8; ++var11)
{
this.sectorFree.set(var6 + var11, Boolean.valueOf(false));
}
this.write(var6, par3ArrayOfByte, par4);
}
else
{
this.dataFile.seek(this.dataFile.length());
var6 = this.sectorFree.size();
for (var11 = 0; var11 < var8; ++var11)
{
this.dataFile.write(emptySector);
this.sectorFree.add(Boolean.valueOf(false));
}
this.sizeDelta += 4096 * var8;
this.write(var6, par3ArrayOfByte, par4);
this.setOffset(par1, par2, var6 << 8 | var8);
}
}
this.setChunkTimestamp(par1, par2, (int)(System.currentTimeMillis() / 1000L));
}
catch (IOException var12)
{
var12.printStackTrace();
}
}
/**
* args: sectorNumber, data, length - write the chunk data to this RegionFile
*/
private void write(int par1, byte[] par2ArrayOfByte, int par3) throws IOException
{
this.dataFile.seek((long)(par1 * 4096));
this.dataFile.writeInt(par3 + 1);
this.dataFile.writeByte(2);
this.dataFile.write(par2ArrayOfByte, 0, par3);
}
/**
* args: x, z - check region bounds
*/
private boolean outOfBounds(int par1, int par2)
{
return par1 < 0 || par1 >= 32 || par2 < 0 || par2 >= 32;
}
/**
* args: x, y - get chunk's offset in region file
*/
private int getOffset(int par1, int par2)
{
return this.offsets[par1 + par2 * 32];
}
/**
* args: x, z, - true if chunk has been saved / converted
*/
public boolean isChunkSaved(int par1, int par2)
{
return this.getOffset(par1, par2) != 0;
}
/**
* args: x, z, offset - sets the chunk's offset in the region file
*/
private void setOffset(int par1, int par2, int par3) throws IOException
{
this.offsets[par1 + par2 * 32] = par3;
this.dataFile.seek((long)((par1 + par2 * 32) * 4));
this.dataFile.writeInt(par3);
}
/**
* args: x, z, timestamp - sets the chunk's write timestamp
*/
private void setChunkTimestamp(int par1, int par2, int par3) throws IOException
{
this.chunkTimestamps[par1 + par2 * 32] = par3;
this.dataFile.seek((long)(4096 + (par1 + par2 * 32) * 4));
this.dataFile.writeInt(par3);
}
/**
* close this RegionFile and prevent further writes
*/
public void close() throws IOException
{
if (this.dataFile != null)
{
this.dataFile.close();
}
}
}