VTK-3399 - extract pritate functions (so that don't need to create those each time the updateHeader-function is called)
VTK-3399 - extract pritate functions (so that don't need to create those each time the updateHeader-function is called)

vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk