public ZDeflateStream(Stream compressed, Constants.Level level = Constants.Level.BestCompression,
Constants.Strategy strategy = Constants.Strategy.DefaultStrategy, int memLevel = 9,
bool useZlibFormat = false, int windowBits = Constants.MaxBufferSize)
{
Constants.RetCode ret;
_compressed = compressed;
_buffer = new byte[1 << 15];
unsafe
{
fixed(ZStream *pZstream = &_zstrm)
{
ret = Zlib.DeflateInit2(pZstream, (int)level, 8, useZlibFormat ? windowBits : -windowBits, memLevel, strategy);
}
}
if (ret != Constants.RetCode.OK)
{
throw Contracts.Except("Could not initialize zstream. Error code: {0}", ret);
}
_zstrm.AvailOut = (uint)_buffer.Length;
}
private ZlibImpl(ArgumentsBase args, bool isDeflate)
{
Contracts.CheckUserArg(args.CompressionLevel == null ||
(0 <= args.CompressionLevel && args.CompressionLevel <= 9),
nameof(args.CompressionLevel), "Must be in range 0 to 9 or null");
Contracts.CheckUserArg(8 <= args.WindowBits && args.WindowBits <= 15, nameof(args.WindowBits), "Must be in range 8 to 15");
Contracts.CheckUserArg(1 <= args.MemoryLevel && args.MemoryLevel <= 9, nameof(args.MemoryLevel), "Must be in range 1 to 9");
Contracts.CheckUserArg(Enum.IsDefined(typeof(Constants.Strategy), args.Strategy), nameof(args.Strategy), "Value was not defined");
if (args.CompressionLevel == null)
{
_level = Constants.Level.DefaultCompression;
}
else
{
_level = (Constants.Level)args.CompressionLevel;
}
Contracts.Assert(Enum.IsDefined(typeof(Constants.Level), _level));
_windowBits = args.WindowBits;
_isDeflate = isDeflate;
_memoryLevel = args.MemoryLevel;
_strategy = args.Strategy;
}
public static unsafe Constants.RetCode DeflateInit2(ZStream *strm, int level, int method, int windowBits,
int memLevel, Constants.Strategy strategy)
{
return(deflateInit2_(strm, level, method, windowBits, memLevel, strategy, zlibVersion(), sizeof(ZStream)));
}
private static unsafe extern Constants.RetCode deflateInit2_(ZStream *strm, int level, int method, int windowBits,
int memLevel, Constants.Strategy strategy, byte *version, int streamSize);
