public static Stream Decompress(Stream stream)
{
using (var reader = new FileReader(stream, true))
{
ushort check = reader.ReadUInt16();
reader.ReadUInt16();
if (check != 0)
{
reader.SetByteOrder(true);
}
else
{
reader.SetByteOrder(false);
}
try
{
uint chunkCount = reader.ReadUInt32();
uint decompressedSize = reader.ReadUInt32();
uint[] chunkSizes = reader.ReadUInt32s((int)chunkCount); //Not very sure about this
reader.Align(128);
List <byte[]> DecompressedChunks = new List <byte[]>();
Console.WriteLine($"pos {reader.Position}");
//Now search for zlibbed chunks
while (!reader.EndOfStream)
{
uint size = reader.ReadUInt32();
long pos = reader.Position;
ushort magic = reader.ReadUInt16();
///Check zlib magic
if (magic == 0x78da || magic == 0xda78)
{
var data = STLibraryCompression.ZLIB.Decompress(reader.getSection((uint)pos, size));
DecompressedChunks.Add(data);
reader.SeekBegin(pos + size); //Seek the compressed size and align it to goto the next chunk
reader.Align(128);
}
else //If the magic check fails, seek back 2. This shouldn't happen, but just incase
{
reader.Seek(-2);
}
}
//Return the decompressed stream with all chunks combined
return(new MemoryStream(ByteUtils.CombineArray(DecompressedChunks.ToArray())));
}
catch
{
}
}
return(null);
}
public static bool IsCompressed(Stream stream)
{
if (stream.Length < 32)
{
return(false);
}
using (var reader = new FileReader(stream, true))
{
reader.Position = 0;
ushort check = reader.ReadUInt16();
reader.ReadUInt16();
if (check != 0)
{
reader.SetByteOrder(true);
}
else
{
reader.SetByteOrder(false);
}
uint chunkCount = reader.ReadUInt32();
uint decompressedSize = reader.ReadUInt32();
if (reader.BaseStream.Length > 8 + (chunkCount * 4) + 128)
{
uint[] chunkSizes = reader.ReadUInt32s((int)chunkCount);
reader.Align(128);
//Now search for zlibbed chunks
uint size = reader.ReadUInt32();
ushort magic = reader.ReadUInt16();
reader.Position = 0;
if (magic == 0x78da || magic == 0xda78)
{
return(true);
}
else
{
return(false);
}
}
reader.Position = 0;
}
return(false);
}