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

		private int calcBitLength(
			int		indx,
			int[]	mag)
		{
			for (;;)
			{
				if (indx >= mag.Length)
					return 0;

				if (mag[indx] != 0)
					break;

				++indx;
			}

			// bit length for everything after the first int
			int bitLength = 32 * ((mag.Length - indx) - 1);

			// and determine bitlength of first int
			int firstMag = mag[indx];
			bitLength += BitLen(firstMag);

			// Check for negative powers of two
			if (sign < 0 && ((firstMag & -firstMag) == firstMag))
			{
				do
				{
					if (++indx >= mag.Length)
					{
						--bitLength;
						break;
					}
				}
				while (mag[indx] == 0);
			}

			return bitLength;
		}