public NbtNode Read(int x, int z)
{
lock (this)
{
MoveToHeaderPosition(x, z);
var index = _filePointer.ReadInt32();
if (index == 0)
{
return(null); // Not yet generated
}
int usedSectors = index & 0xFF;
int sectorOffset = index >> 8;
_filePointer.Seek(sectorOffset * 4096, SeekOrigin.Begin);
int chunkLength = _filePointer.ReadInt32();
if (chunkLength == -1)
{
return(null); // Not yet generated
}
byte compressionMode = _filePointer.ReadByte();
MemoryStream decompressStream;
if (compressionMode == 0)
{
}
if (compressionMode == 1)
{
byte[] buffer = new byte[chunkLength];
_filePointer.Read(buffer, 0, buffer.Length);
buffer = Decompress(buffer);
decompressStream = new MemoryStream(buffer);
}
else
{
byte[] buffer = new byte[chunkLength];
_filePointer.Read(buffer, 0, buffer.Length);
var def = new Inflater();
decompressStream = new MemoryStream();
def.setInput(buffer);
int i = 0;
buffer = new byte[1024 * 1024];
try
{
while (!def.finished() && (i = def.inflate(buffer)) > 0)
{
decompressStream.Write(buffer, 0, i);
}
}
catch
{
return(null);
}
decompressStream.Seek(0, SeekOrigin.Begin);
}
return(new NbtReader().ReadNbtFile(decompressStream));
}
}
public virtual int sceZlibDecompress(TPointer outBufferAddr, int outBufferLength, TPointer inBufferAddr, TPointer32 crc32Addr)
{
sbyte[] inBuffer = new sbyte[4096];
sbyte[] outBuffer = new sbyte[4096];
int inBufferPtr = 0;
IMemoryReader reader = MemoryReader.getMemoryReader(inBufferAddr.Address, 1);
IMemoryWriter writer = MemoryWriter.getMemoryWriter(outBufferAddr.Address, outBufferLength, 1);
CRC32 crc32 = new CRC32();
Inflater inflater = new Inflater();
while (!inflater.finished())
{
if (inflater.needsInput())
{
for (inBufferPtr = 0; inBufferPtr < inBuffer.Length; ++inBufferPtr)
{
inBuffer[inBufferPtr] = (sbyte)reader.readNext();
}
inflater.Input = inBuffer;
}
try
{
int count = inflater.inflate(outBuffer);
if (inflater.TotalOut > outBufferLength)
{
Console.WriteLine(string.Format("sceZlibDecompress : zlib decompress buffer too small inBuffer={0}, outLength={1:D}", inBufferAddr, outBufferLength));
return(SceKernelErrors.ERROR_INVALID_SIZE);
}
crc32.update(outBuffer, 0, count);
for (int i = 0; i < count; ++i)
{
writer.writeNext(outBuffer[i] & 0xFF);
}
}
catch (DataFormatException)
{
Console.WriteLine(string.Format("sceZlibDecompress : malformed zlib stream inBuffer={0}", inBufferAddr));
return(SceKernelErrors.ERROR_INVALID_FORMAT);
}
}
writer.flush();
crc32Addr.setValue((int)crc32.Value);
return(inflater.TotalOut);
}
