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Listing 4 Collapsing IP quads

std::wstring CIPEncoder::CollapseQuads(std::wstring quadOne
    , std::wstring quadTwo) const
    {
    return CollapseQuads(quadOne, quadTwo, L"", L"");
    }
std::wstring CIPEncoder::CollapseQuads(std::wstring quadOne
    , std::wstring quadTwo, std::wstring quadThree) const
    {
    return CollapseQuads(quadOne, quadTwo, quadThree, L"");
    }
std::wstring CIPEncoder::CollapseQuads(std::wstring quadOne
    , std::wstring quadTwo, std::wstring quadThree, std::wstring quadFour) const
    {
    // An empty string converts to a single 0, but to make the math work 
    // correctly we need two-digit hex values.  Thus we prepend the missing
    // 0 if the conversion gives an odd number of digits.
    quadOne = CConverters::DecimalToHex(quadOne);
    if (1 == (quadOne.length() % 2))
        {
        quadOne = L"0" + quadOne;
        }
    quadTwo = CConverters::DecimalToHex(quadTwo);
    if (1 == (quadTwo.length() % 2))
        {
        quadTwo = L"0" + quadTwo;
        }
    quadThree = CConverters::DecimalToHex(quadThree);
    if (1 == (quadThree.length() % 2))
        {
        quadThree = L"0" + quadThree;
        }
    quadFour = CConverters::DecimalToHex(quadFour);
    if (1 == (quadFour.length() % 2))
        {
        quadFour = L"0" + quadFour;
        }
    return CConverters::HexToDecimal(quadOne + quadTwo + quadThree + quadFour);
    }

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