public async Task <Handshake> GetHandshakeMessage(PipeReader input)
{
ReadResult readAsync = await input.ReadAsync().ConfigureAwait(false);
if (readAsync.Buffer.Length >= FrameHeaderSize)
{
ReadOnlySequence <byte> handshakeBytes =
readAsync.Buffer.Slice(0, FrameHeaderSize);
ArraySegment <byte> arraySegment = handshakeBytes.ToArraySegment();
if (Handshake.TryParse(arraySegment, out Handshake result))
{
input.AdvanceTo(readAsync.Buffer.GetPosition(FrameHeaderSize));
return(result);
}
}
input.AdvanceTo(readAsync.Buffer.GetPosition(0));
return(null);
}