Convert Eclipse Grid to DGF grid along with permeability and porosity data

Hi, I want to convert eclipse grid file to dgf grid file along with the porosity and permeability data. As per dumux-handbook-2.12, page: 74, One needs to create an object of Dune::DGFWriter and call the write() function. But as an example, Dune :: DGFWriterParam was created in the handbook:

Dune::DGFWriterParam < CpGrid::LeafGridView > dgfWriter( grid.leafView()) ); \\grid.leafGridView()

Could you please tell me where can I find the class details of DGFWriterParam, so that I can know about functions to write permeability and porosity data to dgf grid file?

Thank you!

Regards, Ranjeet