private static DataStream Compress(DataStream inputDataStream, CompressorParameters parameters)
{
DataStream outputDataStream = DataStreamFactory.FromMemory();
var writer = new DataWriter(outputDataStream)
{
DefaultEncoding = Encoding.ASCII,
};
if (parameters == null)
{
parameters = new CompressorParameters
{
Version = 0x01,
Endianness = 0x00,
};
}
writer.Endianness = parameters.Endianness == 0 ? EndiannessMode.LittleEndian : EndiannessMode.BigEndian;
writer.Write("SLLZ", false);
writer.Write(parameters.Endianness);
writer.Write(parameters.Version);
writer.Write((ushort)0x10); // Header size
writer.Write((int)inputDataStream.Length);
writer.Stream.PushCurrentPosition();
writer.Write(0x00000000); // Compressed size
DataStream compressedDataStream;
if (parameters.Version == 1)
{
compressedDataStream = CompressV1(inputDataStream);
}
else if (parameters.Version == 2)
{
if (inputDataStream.Length < 0x1B)
{
throw new FormatException($"SLLZv2: Input size must more than 0x1A.");
}
compressedDataStream = CompressV2(inputDataStream);
}
else
{
throw new FormatException($"SLLZ: Unknown compression version {parameters.Version}.");
}
compressedDataStream.WriteTo(outputDataStream);
writer.Stream.PopPosition();
writer.Write((int)(compressedDataStream.Length + 0x10)); // data + header
compressedDataStream.Dispose();
return(outputDataStream);
}
/// <summary>
/// Initializes the compressor parameters.
/// </summary>
/// <param name="parameters">Compressor configuration.</param>
public void Initialize(CompressorParameters parameters)
{
this.compressorParameters = parameters;
}