IronRuby.Builtins.RubyIOOps.SystemRead C# (CSharp) Method

        public static MutableString/*!*/ SystemRead(RubyIO/*!*/ self, [DefaultProtocol]int bytes, [DefaultProtocol, Optional]MutableString buffer) {
            var stream = self.GetReadableStream();
            if (stream.DataBuffered) {
                throw RubyExceptions.CreateIOError("sysread for buffered IO");
            }

            // We use Flush to simulate non-buffered IO. 
            // A better approach would be to create a parallel FileStream with 
            // System.IO.FileOptions.WriteThrough (which corresponds to FILE_FLAG_NO_BUFFERING), and also maybe 
            // System.IO.FileOptions.SequentialScan (FILE_FLAG_SEQUENTIAL_SCAN).
            // TODO: sysopen does that?
            stream.Flush();

            var result = Read(self, bytes, buffer);
            if (result == null) {
                throw new EOFError("end of file reached");
            }
            return result;
        }