object.h

   1 #ifndef OBJECT_H
   2 #define OBJECT_H
   3
   4 struct object_list {
   5         struct object *item;
   6         struct object_list *next;
   7 };
   8
   9 struct object_refs {
  10         unsigned count;
  11         struct object *ref[FLEX_ARRAY]; /* more */
  12 };
  13
  14 struct object_array {
  15         unsigned int nr;
  16         unsigned int alloc;
  17         struct object_array_entry {
  18                 struct object *item;
  19                 const char *name;
  20         } *objects;
  21 };
  22
  23 #define TYPE_BITS   3
  24 #define FLAG_BITS  27
  25
  26 /*
  27  * The object type is stored in 3 bits.
  28  */
  29 struct object {
  30         unsigned parsed : 1;
  31         unsigned used : 1;
  32         unsigned type : TYPE_BITS;
  33         unsigned flags : FLAG_BITS;
  34         unsigned char sha1[20];
  35 };
  36
  37 extern int track_object_refs;
  38
  39 extern const char *typename(unsigned int type);
  40 extern int type_from_string(const char *str);
  41
  42 extern unsigned int get_max_object_index(void);
  43 extern struct object *get_indexed_object(unsigned int);
  44 extern struct object_refs *lookup_object_refs(struct object *);
  45
  46 /** Internal only **/
  47 struct object *lookup_object(const unsigned char *sha1);
  48
  49 extern void *create_object(const unsigned char *sha1, int type, void *obj);
  50
  51 /** Returns the object, having parsed it to find out what it is. **/
  52 struct object *parse_object(const unsigned char *sha1);
  53
  54 /* Given the result of read_sha1_file(), returns the object after
  55  * parsing it.  eaten_p indicates if the object has a borrowed copy
  56  * of buffer and the caller should not free() it.
  57  */
  58 struct object *parse_object_buffer(const unsigned char *sha1, enum object_type type, unsigned long size, void *buffer, int *eaten_p);
  59
  60 /** Returns the object, with potentially excess memory allocated. **/
  61 struct object *lookup_unknown_object(const unsigned  char *sha1);
  62
  63 struct object_refs *alloc_object_refs(unsigned count);
  64 void set_object_refs(struct object *obj, struct object_refs *refs);
  65
  66 void mark_reachable(struct object *obj, unsigned int mask);
  67
  68 struct object_list *object_list_insert(struct object *item,
  69                                        struct object_list **list_p);
  70
  71 void object_list_append(struct object *item,
  72                         struct object_list **list_p);
  73
  74 unsigned object_list_length(struct object_list *list);
  75
  76 int object_list_contains(struct object_list *list, struct object *obj);
  77
  78 /* Object array handling .. */
  79 void add_object_array(struct object *obj, const char *name, struct object_array *array);
  80
  81 #endif /* OBJECT_H */