Within MEDMEM_GenDriver.hxx :
 /* Modify the following line to add a new driver type (step 1) */
  typedef enum { MED_DRIVER = 0, GIBI_DRIVER = 1, VTK_DRIVER = 254, NO_DRIVER = 255 } driverTypes;

Note : MED Drivers with no Mesh or Field drivers must have a number of 255-i !

Within MEDMEM_Object.hxx
  // Add your personnal driver header & line (step 2)
  // At least one line must exist
  // You have to respect the syntax.
  #include "MEDMEM_TypeObjectDriver.hxx"

  friend class MED_OBJECT_RDONLY_DRIVER; 
  friend class MED_OBJECT_WRONLY_DRIVER; 
  friend class MED_OBJECT_RDWR_DRIVER;  

  // Add a similar line for your personnal driver (step 3) 
  static INSTANCE_DE<MED_OBJECT_RDWR_DRIVER> inst_med ;

Within MEDMEM_Object.cxx
  // Add a similar line for your personnal driver (step 3) 
  static INSTANCE_DE<MED_OBJECT_RDWR_DRIVER> inst_med ;

  // Add your own driver in the driver list       (step 4) 
  // Note the list must be coherent with the driver type list defined in MEDMEM_DRIVER.hxx. 
   const OBJECT::INSTANCE * const OBJECT::instances[] =   {  &OBJECT::inst_med } ;

Within MEDMEM_TypeObjectDriver.hxx (ypu can use MEDMEM_TypeObjectDriver.hxx as a pattern for your driver !)

  // Faux : you have to create at least create a TYPE_OBJECT_RDWR_DRIVER even if it only throw an exception
  // Faux : because RDONLY or WRONLY doesn't exists.

  Whatever is your driver : RDONLY,WRONLY,RDWR, you must inplement the write & read methods ( even if it only throw an exception)

TODO :

Gerer l'appartenance d'un driver type 3 Within l'objet

Within les méthodes addDriver :
  driver = instances[driverType]->run(fileName, this) ; --> Il faut vérifier que le numéro auquel on accède existe !