private async ValueTask ReadFrameAsync(CancellationToken cancellationToken) { UpdateKnownMessageSize(-1); await InnerTransport.ReadAllAsync(HeaderBuf, 0, HeaderSize, cancellationToken); int size = BinaryPrimitives.ReadInt32BigEndian(HeaderBuf); if ((0 > size) || (size > Configuration.MaxFrameSize)) // size must be in the range 0 to allowed max { throw new TTransportException(TTransportException.ExceptionType.Unknown, $"Maximum frame size exceeded ({size} bytes)"); } UpdateKnownMessageSize(size + HeaderSize); ReadBuffer.SetLength(size); ReadBuffer.Seek(0, SeekOrigin.Begin); ReadBuffer.TryGetBuffer(out ArraySegment <byte> bufSegment); await InnerTransport.ReadAllAsync(bufSegment.Array, 0, size, cancellationToken); }