System.Configuration.MgmtConfigurationRecord.CheckPreamble C# (CSharp) Method

        private void CheckPreamble(byte[] preamble, XmlUtilWriter utilWriter, byte[] buffer) {
            bool hasByteOrderMark = false;
            using (Stream preambleStream = new MemoryStream(buffer)) {
                byte[] streamStart = new byte[preamble.Length];
                if (preambleStream.Read(streamStart, 0, streamStart.Length) == streamStart.Length) {
                    hasByteOrderMark = true;
                    for (int i = 0; i < streamStart.Length; i++) {
                        if (streamStart[i] != preamble[i]) {
                            hasByteOrderMark = false;
                            break;
                        }
                    }
                }
            }

            if (!hasByteOrderMark) {
                // Force the writer to emit byte order mark, then reset the stream 
                // so that it is written over.
                object checkpoint = utilWriter.CreateStreamCheckpoint();
                utilWriter.Write('x');
                utilWriter.RestoreStreamCheckpoint(checkpoint);
            }
        }