Org.BouncyCastle.Math.BigInteger.QuickPow2Check C# (CSharp) Method

		private bool QuickPow2Check()
		{
			return sign > 0 && nBits == 1;
		}

		public BigInteger Remainder(
			BigInteger n)
		{
			if (n.sign == 0)
				throw new ArithmeticException("Division by zero error");

			if (this.sign == 0)
				return Zero;

			// For small values, use fast remainder method
			if (n.magnitude.Length == 1)
			{
				int val = n.magnitude[0];

				if (val > 0)
				{
					if (val == 1)
						return Zero;

					// TODO Make this func work on uint, and handle val == 1?
					int rem = Remainder(val);

					return rem == 0
						?	Zero
						:	new BigInteger(sign, new int[]{ rem }, false);
				}
			}

			if (CompareNoLeadingZeroes(0, magnitude, 0, n.magnitude) < 0)
				return this;

			int[] result;
			if (n.QuickPow2Check())  // n is power of two
			{
				// TODO Move before small values branch above?
				result = LastNBits(n.Abs().BitLength - 1);
			}
			else
			{
				result = (int[]) this.magnitude.Clone();
				result = Remainder(result, n.magnitude);
			}

			return new BigInteger(sign, result, true);
		}