struct upkg_file *upkg_export_open(struct upkg *pkg, unsigned long idx);
size_t upkg_export_read(struct upkg_file *f, void *buf, size_t n);
int upkg_export_seek(struct upkg_file *f, long offset, int whence);
struct upkg_file *upkg_export_open(struct upkg *pkg, unsigned long idx);
size_t upkg_export_read(struct upkg_file *f, void *buf, size_t n);
int upkg_export_seek(struct upkg_file *f, long offset, int whence);