System.Text.Utf8.Utf8Encoder.GetNumberOfEncodedBytes C# (CSharp) Метод

        internal static int GetNumberOfEncodedBytes(UnicodeCodePoint codePoint)
        {
            if (codePoint.Value <= 0x7F)
            {
                return 1;
            }

            if (codePoint.Value <= 0x7FF)
            {
                return 2;
            }

            if (codePoint.Value <= 0xFFFF)
            {
                return 3;
            }

            if (codePoint.Value <= 0x1FFFFF)
            {
                return 4;
            }

            return 0;
        }

        private static int GetUtf8LengthInBytes(IEnumerable <UnicodeCodePoint> codePoints)
        {
            int len = 0;

            foreach (var codePoint in codePoints)
            {
                len += Utf8Encoder.GetNumberOfEncodedBytes(codePoint);
            }

            return(len);
        }