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 *base;
  12         struct object *ref[FLEX_ARRAY]; /* more */
  13 };
  14
  15 struct object_array {
  16         unsigned int nr;
  17         unsigned int alloc;
  18         struct object_array_entry {
  19                 struct object *item;
  20                 const char *name;
  21         } *objects;
  22 };
  23
  24 #define TYPE_BITS   3
  25 #define FLAG_BITS  27
  26
  27 /*
  28  * The object type is stored in 3 bits.
  29  */
  30 struct object {
  31         unsigned parsed : 1;
  32         unsigned used : 1;
  33         unsigned type : TYPE_BITS;
  34         unsigned flags : FLAG_BITS;
  35         unsigned char sha1[20];
  36 };
  37
  38 extern int track_object_refs;
  39 extern const char *type_names[9];
  40
  41 extern unsigned int get_max_object_index(void);
  42 extern struct object *get_indexed_object(unsigned int);
  43
  44 static inline const char *typename(unsigned int type)
  45 {
  46         return type_names[type > OBJ_BAD ? OBJ_BAD : type];
  47 }
  48
  49 extern struct object_refs *lookup_object_refs(struct object *);
  50
  51 /** Internal only **/
  52 struct object *lookup_object(const unsigned char *sha1);
  53
  54 /** Returns the object, having looked it up as being the given type. **/
  55 struct object *lookup_object_type(const unsigned char *sha1, const char *type);
  56
  57 void created_object(const unsigned char *sha1, struct object *obj);
  58
  59 /** Returns the object, having parsed it to find out what it is. **/
  60 struct object *parse_object(const unsigned char *sha1);
  61
  62 /* Given the result of read_sha1_file(), returns the object after
  63  * parsing it.  eaten_p indicates if the object has a borrowed copy
  64  * of buffer and the caller should not free() it.
  65  */
  66 struct object *parse_object_buffer(const unsigned char *sha1, const char *type, unsigned long size, void *buffer, int *eaten_p);
  67
  68 /** Returns the object, with potentially excess memory allocated. **/
  69 struct object *lookup_unknown_object(const unsigned  char *sha1);
  70
  71 struct object_refs *alloc_object_refs(unsigned count);
  72 void set_object_refs(struct object *obj, struct object_refs *refs);
  73
  74 void mark_reachable(struct object *obj, unsigned int mask);
  75
  76 struct object_list *object_list_insert(struct object *item,
  77                                        struct object_list **list_p);
  78
  79 void object_list_append(struct object *item,
  80                         struct object_list **list_p);
  81
  82 unsigned object_list_length(struct object_list *list);
  83
  84 int object_list_contains(struct object_list *list, struct object *obj);
  85
  86 /* Object array handling .. */
  87 void add_object_array(struct object *obj, const char *name, struct object_array *array);
  88
  89 #endif /* OBJECT_H */