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 enum object_type {
  31         OBJ_NONE = 0,
  32         OBJ_COMMIT = 1,
  33         OBJ_TREE = 2,
  34         OBJ_BLOB = 3,
  35         OBJ_TAG = 4,
  36         /* 5/6 for future expansion */
  37         OBJ_DELTA = 7,
  38         OBJ_BAD,
  39 };
  40
  41 struct object {
  42         unsigned parsed : 1;
  43         unsigned used : 1;
  44         unsigned type : TYPE_BITS;
  45         unsigned flags : FLAG_BITS;
  46         unsigned char sha1[20];
  47 };
  48
  49 extern int track_object_refs;
  50 extern const char *type_names[9];
  51
  52 extern unsigned int get_max_object_index(void);
  53 extern struct object *get_indexed_object(unsigned int);
  54
  55 static inline const char *typename(unsigned int type)
  56 {
  57         return type_names[type > OBJ_BAD ? OBJ_BAD : type];
  58 }
  59
  60 extern struct object_refs *lookup_object_refs(struct object *);
  61
  62 /** Internal only **/
  63 struct object *lookup_object(const unsigned char *sha1);
  64
  65 /** Returns the object, having looked it up as being the given type. **/
  66 struct object *lookup_object_type(const unsigned char *sha1, const char *type);
  67
  68 void created_object(const unsigned char *sha1, struct object *obj);
  69
  70 /** Returns the object, having parsed it to find out what it is. **/
  71 struct object *parse_object(const unsigned char *sha1);
  72
  73 /** Returns the object, with potentially excess memory allocated. **/
  74 struct object *lookup_unknown_object(const unsigned  char *sha1);
  75
  76 struct object_refs *alloc_object_refs(unsigned count);
  77 void set_object_refs(struct object *obj, struct object_refs *refs);
  78
  79 void mark_reachable(struct object *obj, unsigned int mask);
  80
  81 struct object_list *object_list_insert(struct object *item,
  82                                        struct object_list **list_p);
  83
  84 void object_list_append(struct object *item,
  85                         struct object_list **list_p);
  86
  87 unsigned object_list_length(struct object_list *list);
  88
  89 int object_list_contains(struct object_list *list, struct object *obj);
  90
  91 /* Object array handling .. */
  92 void add_object_array(struct object *obj, const char *name, struct object_array *array);
  93
  94 #endif /* OBJECT_H */