iTextSharp.text.pdf.qrcode.GF256.Multiply C# (CSharp) Метод

        internal int Multiply(int a, int b) {
            if (a == 0 || b == 0) {
                return 0;
            }
            if (a == 1) {
                return b;
            }
            if (b == 1) {
                return a;
            }
            return expTable[(logTable[a] + logTable[b]) % 255];
        }
    }

        /**
         * @return evaluation of this polynomial at a given point
         */
        internal int EvaluateAt(int a)
        {
            if (a == 0)
            {
                // Just return the x^0 coefficient
                return(GetCoefficient(0));
            }
            var size = coefficients.Length;

            if (a == 1)
            {
                // Just the sum of the coefficients
                var result2 = 0;
                for (var i = 0; i < size; i++)
                {
                    result2 = GF256.AddOrSubtract(result2, coefficients[i]);
                }
                return(result2);
            }
            var result = coefficients[0];

            for (var i = 1; i < size; i++)
            {
                result = GF256.AddOrSubtract(field.Multiply(a, result), coefficients[i]);
            }
            return(result);
        }