adding HLS color to existing snapshots

ar << sizeof(RING);
ar << m_Ring.GetCount();
POSITION    pos = m_Ring.GetHeadPosition();
for (int i = 0; i < m_Ring.GetCount(); i++) {
    RING    rp = m_Ring.GetNext(pos);
    double  h, l, s;
    int c = rp.Color;
    CHLS::rgb2hls(GetRValue(c) / 255.0, 
        GetGValue(c) / 255.0, GetBValue(c) / 255.0, h, l, s);
    rp.Hue = h;
    rp.Lightness = l;
    rp.Saturation = s;
    ar.Write(&rp, sizeof(RING));
}