* fs/iso9660.c (GRUB_ISO9660_VOLDESC_BOOT): New macro.
(GRUB_ISO9660_VOLDESC_PRIMARY): Likewise.
(GRUB_ISO9660_VOLDESC_SUPP): Likewise.
(GRUB_ISO9660_VOLDESC_PART): Likewise.
(GRUB_ISO9660_VOLDESC_END): Likewise.
(grub_iso9660_primary_voldesc): New member escape.
(grub_iso9660_data): New member joliet.
(grub_iso9660_convert_string): New function.
(grub_iso9660_mount): Detect joliet extension.
(grub_iso9660_iterate_dir): Convert filename when joliet is detected.
(grub_iso9660_iso9660_label): Likewise.