iTextSharp.text.pdf.BarcodePDF417.GetTextTypeAndValue C# (CSharp) Метод

        private static int GetTextTypeAndValue(byte[] input, int maxLength, int idx) {
            if (idx >= maxLength)
                return 0;
            char c = (char)(input[idx] & 0xff);
            if (c >= 'A' && c <= 'Z')
                return (ALPHA + c - 'A');
            if (c >= 'a' && c <= 'z')
                return (LOWER + c - 'a');
            if (c == ' ')
                return (ALPHA + LOWER + MIXED + SPACE);
            int ms = MIXED_SET.IndexOf(c);
            int ps = PUNCTUATION_SET.IndexOf(c);
            if (ms < 0 && ps < 0)
                return (ISBYTE + c);
            if (ms == ps)
                return (MIXED + PUNCTUATION + ms);
            if (ms >= 0)
                return (MIXED + ms);
            return (PUNCTUATION + ps);
        }