private static void CheckHeader(SllzHeader header)
{
if (header == null)
{
throw new ArgumentNullException(nameof(header));
}
if (header.Magic != "SLLZ")
{
throw new FormatException($"SLLZ zlib: Bad magic Id ({header.Magic} != SLLZ)");
}
if (header.CompressionType != CompressionType.Zlib)
{
throw new FormatException($"SLLZ zlib: Bad Compression Type ({header.CompressionType})");
}
}
/// <summary>
/// Creates a SLLZ standard compressed BinaryFormat.
/// </summary>
/// <param name="source">Original format.</param>
/// <returns>The compressed binary.</returns>
public ParFile Convert(BinaryFormat source)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
source.Stream.Seek(0);
byte[] data = new byte[source.Stream.Length];
_ = source.Stream.Read(data, 0, data.Length);
byte[] compressedData;
try
{
compressedData = Compress(data);
}
catch (SllzException)
{
// Data can't be compressed
return(new ParFile(source.Stream));
}
DataStream outputDataStream = compressorParameters.OutputStream ?? DataStreamFactory.FromMemory();
outputDataStream.Position = 0;
var writer = new DataWriter(outputDataStream)
{
DefaultEncoding = Encoding.ASCII,
Endianness = compressorParameters.Endianness == Endianness.LittleEndian
? EndiannessMode.LittleEndian
: EndiannessMode.BigEndian,
};
var header = new SllzHeader
{
Magic = "SLLZ",
Endianness = compressorParameters.Endianness,
CompressionType = compressorParameters.CompressionType,
HeaderSize = 0x10,
OriginalSize = (uint)source.Stream.Length,
CompressedSize = (uint)compressedData.Length + 0x10, // includes header length
};
writer.WriteOfType(header);
writer.Write(compressedData);
var fileInfo = new ParFileInfo
{
Flags = 0x80000000,
OriginalSize = (uint)source.Stream.Length,
CompressedSize = (uint)outputDataStream.Length,
DataOffset = 0,
RawAttributes = 0,
ExtendedOffset = 0,
Timestamp = 0,
};
return(new ParFile(fileInfo, outputDataStream));
}
