internal void WriteFourCC(string fourCC)
        {
            byte[] arr = Encoding.ASCII.GetBytes(fourCC);
            Array.Reverse(arr);

            if (arr.Length < 4)
            {
                byte[] backup = arr;
                arr = new byte[arr.Length + 1];
                backup.CopyTo(arr, 0);
            }

            WriteInt32(BitConverter.ToInt32(arr,0));
        }