avt.DynamicFlashRotator.Net.RegCore.Cryptography.BigInteger.operator C# (CSharp) Method

        public static BigInteger operator +(BigInteger bi1, BigInteger bi2)
        {
            BigInteger result = new BigInteger();

            result.dataLength = (bi1.dataLength > bi2.dataLength) ? bi1.dataLength : bi2.dataLength;

            long carry = 0;
            for (int i = 0; i < result.dataLength; i++) {
                long sum = (long)bi1.data[i] + (long)bi2.data[i] + carry;
                carry = sum >> 32;
                result.data[i] = (uint)(sum & 0xFFFFFFFF);
            }

            if (carry != 0 && result.dataLength < maxLength) {
                result.data[result.dataLength] = (uint)(carry);
                result.dataLength++;
            }

            while (result.dataLength > 1 && result.data[result.dataLength - 1] == 0)
                result.dataLength--;


            // overflow check
            int lastPos = maxLength - 1;
            if ((bi1.data[lastPos] & 0x80000000) == (bi2.data[lastPos] & 0x80000000) &&
               (result.data[lastPos] & 0x80000000) != (bi1.data[lastPos] & 0x80000000)) {
                throw (new ArithmeticException());
            }

            return result;
        }