Andrew's git - gitweb.git/blob

   1#ifndef OBJECT_H
   2#define OBJECT_H
   3
   4struct object_list {
   5        struct object *item;
   6        struct object_list *next;
   7};
   8
   9struct 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                unsigned mode;
  22                struct object_context *context;
  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---4
  33 * walker.c:        0-2
  34 * upload-pack.c:               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 */
  42#define FLAG_BITS  27
  43
  44/*
  45 * The object type is stored in 3 bits.
  46 */
  47struct object {
  48        unsigned parsed : 1;
  49        unsigned used : 1;
  50        unsigned type : TYPE_BITS;
  51        unsigned flags : FLAG_BITS;
  52        unsigned char sha1[20];
  53};
  54
  55extern const char *typename(unsigned int type);
  56extern int type_from_string_gently(const char *str, ssize_t, int gentle);
  57#define type_from_string(str) type_from_string_gently(str, -1, 0)
  58
  59/*
  60 * Return the current number of buckets in the object hashmap.
  61 */
  62extern unsigned int get_max_object_index(void);
  63
  64/*
  65 * Return the object from the specified bucket in the object hashmap.
  66 */
  67extern struct object *get_indexed_object(unsigned int);
  68
  69/*
  70 * This can be used to see if we have heard of the object before, but
  71 * it can return "yes we have, and here is a half-initialised object"
  72 * for an object that we haven't loaded/parsed yet.
  73 *
  74 * When parsing a commit to create an in-core commit object, its
  75 * parents list holds commit objects that represent its parents, but
  76 * they are expected to be lazily initialized and do not know what
  77 * their trees or parents are yet.  When this function returns such a
  78 * half-initialised objects, the caller is expected to initialize them
  79 * by calling parse_object() on them.
  80 */
  81struct object *lookup_object(const unsigned char *sha1);
  82
  83extern void *create_object(const unsigned char *sha1, void *obj);
  84
  85void *object_as_type(struct object *obj, enum object_type type, int quiet);
  86
  87/*
  88 * Returns the object, having parsed it to find out what it is.
  89 *
  90 * Returns NULL if the object is missing or corrupt.
  91 */
  92struct object *parse_object(const unsigned char *sha1);
  93
  94/*
  95 * Like parse_object, but will die() instead of returning NULL. If the
  96 * "name" parameter is not NULL, it is included in the error message
  97 * (otherwise, the sha1 hex is given).
  98 */
  99struct object *parse_object_or_die(const unsigned char *sha1, const char *name);
 100
 101/* Given the result of read_sha1_file(), returns the object after
 102 * parsing it.  eaten_p indicates if the object has a borrowed copy
 103 * of buffer and the caller should not free() it.
 104 */
 105struct object *parse_object_buffer(const unsigned char *sha1, enum object_type type, unsigned long size, void *buffer, int *eaten_p);
 106
 107/** Returns the object, with potentially excess memory allocated. **/
 108struct object *lookup_unknown_object(const unsigned  char *sha1);
 109
 110struct object_list *object_list_insert(struct object *item,
 111                                       struct object_list **list_p);
 112
 113int object_list_contains(struct object_list *list, struct object *obj);
 114
 115/* Object array handling .. */
 116void add_object_array(struct object *obj, const char *name, struct object_array *array);
 117void add_object_array_with_mode(struct object *obj, const char *name, struct object_array *array, unsigned mode);
 118void add_object_array_with_context(struct object *obj, const char *name, struct object_array *array, struct object_context *context);
 119
 120typedef int (*object_array_each_func_t)(struct object_array_entry *, void *);
 121
 122/*
 123 * Apply want to each entry in array, retaining only the entries for
 124 * which the function returns true.  Preserve the order of the entries
 125 * that are retained.
 126 */
 127void object_array_filter(struct object_array *array,
 128                         object_array_each_func_t want, void *cb_data);
 129
 130/*
 131 * Remove from array all but the first entry with a given name.
 132 * Warning: this function uses an O(N^2) algorithm.
 133 */
 134void object_array_remove_duplicates(struct object_array *array);
 135
 136/*
 137 * Remove any objects from the array, freeing all used memory; afterwards
 138 * the array is ready to store more objects with add_object_array().
 139 */
 140void object_array_clear(struct object_array *array);
 141
 142void clear_object_flags(unsigned flags);
 143
 144#endif /* OBJECT_H */