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

            public int CompareTo(object obj) {
                BigInteger bi = (BigInteger)obj;
                AssertValid();
                bi.AssertValid();

                if (length > bi.length) {
                    return 1;
                } else if (length < bi.length) {
                    return -1;
                } else if (0 == length) {
                    return 0;
                }

                int idx;

                for (idx = length - 1; digits[idx] == bi.digits[idx]; idx--) {
                    if (0 == idx) {
                        return 0;
                    }
                }
                Debug.Assert(idx >= 0 && idx < length);
                Debug.Assert(digits[idx] != bi.digits[idx]);

                return (digits[idx] > bi.digits[idx]) ? 1 : -1;
            }