Lidgren.Network.NetBigInteger.Add C# (CSharp) Method

        public NetBigInteger Add(
			NetBigInteger value)
        {
            if (m_sign == 0)
                return value;

            if (m_sign != value.m_sign)
            {
                if (value.m_sign == 0)
                    return this;

                if (value.m_sign < 0)
                    return Subtract(value.Negate());

                return value.Subtract(Negate());
            }

            return AddToMagnitude(value.m_magnitude);
        }

		public NetBigInteger And(
			NetBigInteger value)
		{
			if (m_sign == 0 || value.m_sign == 0)
			{
				return Zero;
			}

			int[] aMag = m_sign > 0
				? m_magnitude
				: Add(One).m_magnitude;

			int[] bMag = value.m_sign > 0
				? value.m_magnitude
				: value.Add(One).m_magnitude;

			bool resultNeg = m_sign < 0 && value.m_sign < 0;
			int resultLength = System.Math.Max(aMag.Length, bMag.Length);
			int[] resultMag = new int[resultLength];

			int aStart = resultMag.Length - aMag.Length;
			int bStart = resultMag.Length - bMag.Length;

			for (int i = 0; i < resultMag.Length; ++i)
			{
				int aWord = i >= aStart ? aMag[i - aStart] : 0;
				int bWord = i >= bStart ? bMag[i - bStart] : 0;

				if (m_sign < 0)
				{
					aWord = ~aWord;
				}

				if (value.m_sign < 0)
				{
					bWord = ~bWord;
				}

				resultMag[i] = aWord & bWord;

				if (resultNeg)
				{
					resultMag[i] = ~resultMag[i];
				}
			}

			NetBigInteger result = new NetBigInteger(1, resultMag, true);

			if (resultNeg)
			{
				result = result.Not();
			}

			return result;
		}