iTextSharp.text.pdf.ArabicLigaturizer.Charshape C# (CSharp) Метод

        static char Charshape(char s, int which)
        {
            int l, r, m;
            if ((s >= '\u0621') && (s <= '\u06D3')) {
                l = 0;
                r = chartable.Length - 1;
                while (l <= r) {
                    m = (l + r) / 2;
                    if (s == chartable[m][0]) {
                        return chartable[m][which + 1];
                    }
                    else if (s < chartable[m][0]) {
                        r = m - 1;
                    }
                    else {
                        l = m + 1;
                    }
                }
            }
            else if (s >= '\ufef5' && s <= '\ufefb')
                return (char)(s + which);
            return s;
        }