public static Fin <Unit> WriteTotalSamples(FileStream stream, ulong sampleCount) { stream.Seek(FlacSamplesOffset, SeekOrigin.Begin); // we're writing over the top of other bits, so read first Span <byte> buffer = stackalloc byte[5]; int bytesRead = stream.Read(buffer); if (bytesRead != buffer.Length) { return(FileTooShort); } // flac files have an unsigned 36-bit integer for total sample duration! BinaryHelpers.Write36BitUnsignedBigEndianIgnoringFirstNibble(buffer, sampleCount); stream.Seek(FlacSamplesOffset, SeekOrigin.Begin); stream.Write(buffer); return(Unit.Default); }