iTextSharp.text.pdf.BarcodeDatamatrix.GetNumber C# (CSharp) Метод

        private static int GetNumber(byte[] text, int ptrIn, int n) {
            int v, j, c;
            v = 0;
            for (j = 0; j < n; ++j) {
                c = text[ptrIn++] &0xff;
                if (c < '0' || c > '9')
                    return -1;
                v = v * 10 + c - '0';
            }
            return v;
        }