extern int parse_tag(struct tag *item);
extern struct object *deref_tag(struct object *, const char *, int);
extern size_t parse_signature(const char *buf, unsigned long size);
extern int parse_tag(struct tag *item);
extern struct object *deref_tag(struct object *, const char *, int);
extern size_t parse_signature(const char *buf, unsigned long size);