bool truncate_dvd(DCR *dcr);
bool check_can_write_on_non_blank_dvd(DCR *dcr);
int find_num_dvd_parts(DCR *dcr);
-off_t lseek_dvd(DCR *dcr, off_t offset, int whence);
+boffset_t lseek_dvd(DCR *dcr, boffset_t offset, int whence);
void dvd_remove_empty_part(DCR *dcr);
/* From device.c */