public BrotliStream(Stream baseStream, CompressionMode mode, bool leaveOpen)
{
if (baseStream == null)
{
throw new ArgumentNullException("baseStream");
}
_mode = mode;
_stream = baseStream;
_leaveOpen = leaveOpen;
if (_mode == CompressionMode.Compress)
{
_state = Brolib.BrotliEncoderCreateInstance();
if (_state == IntPtr.Zero)
{
throw new BrotliException("Unable to create brotli encoder instance");
}
Brolib.BrotliEncoderSetParameter(_state, BrotliEncoderParameter.Quality, 5);
Brolib.BrotliEncoderSetParameter(_state, BrotliEncoderParameter.LGWin, 22);
}
else
{
_state = Brolib.BrotliDecoderCreateInstance();
if (_state == IntPtr.Zero)
{
throw new BrotliException("Unable to create brotli decoder instance");
}
}
_ptrInputBuffer = Marshal.AllocHGlobal(BufferSize);
_ptrOutputBuffer = Marshal.AllocHGlobal(BufferSize);
_ptrNextInput = _ptrInputBuffer;
_ptrNextOutput = _ptrOutputBuffer;
_managedBuffer = new Byte[BufferSize];
}
/// <summary>
/// Set the compress LGWin(10~24)
/// </summary>
/// <param name="window">the window size</param>
public void SetWindow(uint window)
{
if (window < 10 || window > 24)
{
throw new ArgumentException("window", "the range of window is 10~24");
}
Brolib.BrotliEncoderSetParameter(_state, BrotliEncoderParameter.LGWin, window);
}
/// <summary>
/// Set the compress quality(0~11)
/// </summary>
/// <param name="quality">compress quality</param>
public void SetQuality(uint quality)
{
if (quality < 0 || quality > 11)
{
throw new ArgumentException("quality", "the range of quality is 0~11");
}
Brolib.BrotliEncoderSetParameter(_state, BrotliEncoderParameter.Quality, quality);
}
static IntPtr CreateEncoderInstance(uint quality, uint windowSize)
{
IntPtr result = Brolib.BrotliEncoderCreateInstance();
if (result == IntPtr.Zero)
{
throw new BrotliException("Unable to create brotli encoder instance");
}
Brolib.BrotliEncoderSetParameter(
result,
BrotliEncoderParameter.Quality,
quality);
Brolib.BrotliEncoderSetParameter(
result,
BrotliEncoderParameter.LGWin,
windowSize);
return(result);
}