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_array {
  10         unsigned int nr;
  11         unsigned int alloc;
  12         struct object_array_entry {
  13                 struct object *item;
  14                 /*
  15                  * name or NULL.  If non-NULL, the memory pointed to
  16                  * is owned by this object *except* if it points at
  17                  * object_array_slopbuf, which is a static copy of the
  18                  * empty string.
  19                  */
  20                 char *name;
  21                 char *path;
  22                 unsigned mode;
  23         } *objects;
  24 };
  25
  26 #define OBJECT_ARRAY_INIT { 0, 0, NULL }
  27
  28 #define TYPE_BITS   3
  29 /*
  30  * object flag allocation:
  31  * revision.h:      0---------10                                26
  32  * fetch-pack.c:    0---5
  33  * walker.c:        0-2
  34  * upload-pack.c:       4       11----------------19
  35  * builtin/blame.c:               12-13
  36  * bisect.c:                               16
  37  * bundle.c:                               16
  38  * http-push.c:                            16-----19
  39  * commit.c:                               16-----19
  40  * sha1_name.c:                                     20
  41  * list-objects-filter.c:                             21
  42  * builtin/fsck.c:  0--3
  43  */
  44 #define FLAG_BITS  27
  45
  46 /*
  47  * The object type is stored in 3 bits.
  48  */
  49 struct object {
  50         unsigned parsed : 1;
  51         unsigned type : TYPE_BITS;
  52         unsigned flags : FLAG_BITS;
  53         struct object_id oid;
  54 };
  55
  56 extern const char *typename(unsigned int type);
  57 extern int type_from_string_gently(const char *str, ssize_t, int gentle);
  58 #define type_from_string(str) type_from_string_gently(str, -1, 0)
  59
  60 /*
  61  * Return the current number of buckets in the object hashmap.
  62  */
  63 extern unsigned int get_max_object_index(void);
  64
  65 /*
  66  * Return the object from the specified bucket in the object hashmap.
  67  */
  68 extern struct object *get_indexed_object(unsigned int);
  69
  70 /*
  71  * This can be used to see if we have heard of the object before, but
  72  * it can return "yes we have, and here is a half-initialised object"
  73  * for an object that we haven't loaded/parsed yet.
  74  *
  75  * When parsing a commit to create an in-core commit object, its
  76  * parents list holds commit objects that represent its parents, but
  77  * they are expected to be lazily initialized and do not know what
  78  * their trees or parents are yet.  When this function returns such a
  79  * half-initialised objects, the caller is expected to initialize them
  80  * by calling parse_object() on them.
  81  */
  82 struct object *lookup_object(const unsigned char *sha1);
  83
  84 extern void *create_object(const unsigned char *sha1, void *obj);
  85
  86 void *object_as_type(struct object *obj, enum object_type type, int quiet);
  87
  88 /*
  89  * Returns the object, having parsed it to find out what it is.
  90  *
  91  * Returns NULL if the object is missing or corrupt.
  92  */
  93 struct object *parse_object(const struct object_id *oid);
  94
  95 /*
  96  * Like parse_object, but will die() instead of returning NULL. If the
  97  * "name" parameter is not NULL, it is included in the error message
  98  * (otherwise, the hex object ID is given).
  99  */
 100 struct object *parse_object_or_die(const struct object_id *oid, const char *name);
 101
 102 /* Given the result of read_sha1_file(), returns the object after
 103  * parsing it.  eaten_p indicates if the object has a borrowed copy
 104  * of buffer and the caller should not free() it.
 105  */
 106 struct object *parse_object_buffer(const struct object_id *oid, enum object_type type, unsigned long size, void *buffer, int *eaten_p);
 107
 108 /** Returns the object, with potentially excess memory allocated. **/
 109 struct object *lookup_unknown_object(const unsigned  char *sha1);
 110
 111 struct object_list *object_list_insert(struct object *item,
 112                                        struct object_list **list_p);
 113
 114 int object_list_contains(struct object_list *list, struct object *obj);
 115
 116 /* Object array handling .. */
 117 void add_object_array(struct object *obj, const char *name, struct object_array *array);
 118 void add_object_array_with_path(struct object *obj, const char *name, struct object_array *array, unsigned mode, const char *path);
 119
 120 /*
 121  * Returns NULL if the array is empty. Otherwise, returns the last object
 122  * after removing its entry from the array. Other resources associated
 123  * with that object are left in an unspecified state and should not be
 124  * examined.
 125  */
 126 struct object *object_array_pop(struct object_array *array);
 127
 128 typedef int (*object_array_each_func_t)(struct object_array_entry *, void *);
 129
 130 /*
 131  * Apply want to each entry in array, retaining only the entries for
 132  * which the function returns true.  Preserve the order of the entries
 133  * that are retained.
 134  */
 135 void object_array_filter(struct object_array *array,
 136                          object_array_each_func_t want, void *cb_data);
 137
 138 /*
 139  * Remove from array all but the first entry with a given name.
 140  * Warning: this function uses an O(N^2) algorithm.
 141  */
 142 void object_array_remove_duplicates(struct object_array *array);
 143
 144 /*
 145  * Remove any objects from the array, freeing all used memory; afterwards
 146  * the array is ready to store more objects with add_object_array().
 147  */
 148 void object_array_clear(struct object_array *array);
 149
 150 void clear_object_flags(unsigned flags);
 151
 152 #endif /* OBJECT_H */