System.Text.SuperEncoding.GetMaxByteCount C# (CSharp) Method

        public override int GetMaxByteCount(int charCount)
        {
            if (charCount < 0)
                throw new ArgumentOutOfRangeException("charCount");
            long count = charCount + 1;
            count *= 2;
            if (count > int.MaxValue)
                throw new ArgumentOutOfRangeException("charCount");
            return (int)count;

        }