System.Xml.Xsl.XPathConvert.BigInteger.Ensure C# (CSharp) Method

            private void Ensure(int cu) {
                AssertValidNoVal();

                if (cu <= capacity) {
                    return;
                }

                cu += cu;
                uint[] newDigits = new uint[cu];
                digits.CopyTo(newDigits, 0);
                digits = newDigits;
                capacity = cu;

                AssertValidNoVal();
            }