bool DecompressFolder()
{
if (decompressed != null)
{
decompressed.Close();
}
decompressed = new MemoryStream();
Console.WriteLine("Decompressing cabinet into RAM...");
var compType = (folder.typeCompress & 0xFF);
if (compType == 3)
{
Console.WriteLine($"(~{Util.GetBytesReadable(header.cbCabinet)} -> ~{Util.GetBytesReadable(decompressedSize)})");
// LZX decompress it
var windowSize = 1 << ((folder.typeCompress >> 8) & 0x1f);
var lzx = new LzxDecoder(windowSize, 0x8000);
reader.BaseStream.Position = headerPos + folder.coffCabStart;
for (int i = 0; i < folder.cCFData; i++)
{
var data = reader.ReadStruct <CFDATA>();
if (dataReservedSize > 0)
{
reader.BaseStream.Position += dataReservedSize;
}
lzx.Decompress(reader.BaseStream, data.cbData, decompressed, data.cbUncomp);
}
return(true);
}
else if (compType == 0)
{
reader.BaseStream.Position = headerPos + folder.coffCabStart;
for (int i = 0; i < folder.cCFData; i++)
{
var data = reader.ReadStruct <CFDATA>();
if (dataReservedSize > 0)
{
reader.BaseStream.Position += dataReservedSize;
}
byte[] block = reader.ReadBytes(data.cbData);
decompressed.Write(block, 0, block.Length);
}
return(true);
}
Console.WriteLine($"Error: cabinet uses unsupported compression type {compType}!");
return(false);
}
// Tries extracting file from the recdata stream
public void Extract(Stream dataStream, Stream outputStream)
{
var lzx = new LzxDecoder(_baseFile.WindowSize, LZXDecompressedBlockSize);
dataStream.Position = DataOffset;
long outStreamPosition = outputStream.Position;
foreach (var blockSize in LzxBlocks)
{
lzx.Decompress(dataStream, blockSize, outputStream, LZXDecompressedBlockSize);
}
lzx.Decompress(dataStream, FinalBlockCompSize, outputStream, FinalBlockDecSize);
// Trim file to size in the entry header
outputStream.SetLength(outStreamPosition + DecompressedSize);
}
