_qpdf_data::_qpdf_data() :
    qpdf(0),
    qpdf_writer(0),
    write_memory(false),
    output_buffer(0)
{
}
_qpdf_data::_qpdf_data() :
    qpdf(0),
    qpdf_writer(0),
    write_memory(false),
    output_buffer(0)
{
}