/// <summary>
/// Write Bytes Routine
/// </summary>
/// <param name="buffer">The buffer.</param>
/// <param name="pos">The position.</param>
/// <param name="len">The length.</param>
protected override void WriteBytes(Byte[] buffer, int pos, int len)
{
_writeCrc32 = CRC32.Checksum(_writeCrc32, buffer, pos, len);
_writeFile.Write(buffer, pos, len);
}