Add several uses of get_object_hash.
[git/git.git] / object.h
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1#ifndef OBJECT_H
2#define OBJECT_H
3
4struct object_list {
5 struct object *item;
6 struct object_list *next;
7};
8
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9struct object_array {
10 unsigned int nr;
11 unsigned int alloc;
12 struct object_array_entry {
13 struct object *item;
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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;
9e0c3c4f 21 char *path;
e5709a4a 22 unsigned mode;
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23 } *objects;
24};
25
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26#define OBJECT_ARRAY_INIT { 0, 0, NULL }
27
885a86ab 28#define TYPE_BITS 3
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29/*
30 * object flag allocation:
1b32dece 31 * revision.h: 0---------10 26
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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 */
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42#define FLAG_BITS 27
43
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44/*
45 * The object type is stored in 3 bits.
46 */
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47struct object {
48 unsigned parsed : 1;
49 unsigned used : 1;
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50 unsigned type : TYPE_BITS;
51 unsigned flags : FLAG_BITS;
6eb8ae00 52 unsigned char sha1[20];
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53};
54
3c427010 55#define get_object_hash(x) ((x).sha1)
56
df843662 57extern const char *typename(unsigned int type);
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58extern int type_from_string_gently(const char *str, ssize_t, int gentle);
59#define type_from_string(str) type_from_string_gently(str, -1, 0)
885a86ab 60
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61/*
62 * Return the current number of buckets in the object hashmap.
63 */
fc046a75 64extern unsigned int get_max_object_index(void);
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65
66/*
67 * Return the object from the specified bucket in the object hashmap.
68 */
fc046a75 69extern struct object *get_indexed_object(unsigned int);
3e4339e6 70
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71/*
72 * This can be used to see if we have heard of the object before, but
73 * it can return "yes we have, and here is a half-initialised object"
74 * for an object that we haven't loaded/parsed yet.
75 *
76 * When parsing a commit to create an in-core commit object, its
77 * parents list holds commit objects that represent its parents, but
78 * they are expected to be lazily initialized and do not know what
79 * their trees or parents are yet. When this function returns such a
80 * half-initialised objects, the caller is expected to initialize them
81 * by calling parse_object() on them.
82 */
5d6ccf5c 83struct object *lookup_object(const unsigned char *sha1);
6eb8ae00 84
d36f51c1 85extern void *create_object(const unsigned char *sha1, void *obj);
6eb8ae00 86
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87void *object_as_type(struct object *obj, enum object_type type, int quiet);
88
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89/*
90 * Returns the object, having parsed it to find out what it is.
91 *
92 * Returns NULL if the object is missing or corrupt.
93 */
5d6ccf5c 94struct object *parse_object(const unsigned char *sha1);
e9eefa67 95
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96/*
97 * Like parse_object, but will die() instead of returning NULL. If the
98 * "name" parameter is not NULL, it is included in the error message
99 * (otherwise, the sha1 hex is given).
100 */
101struct object *parse_object_or_die(const unsigned char *sha1, const char *name);
102
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103/* Given the result of read_sha1_file(), returns the object after
104 * parsing it. eaten_p indicates if the object has a borrowed copy
105 * of buffer and the caller should not free() it.
106 */
21666f1a 107struct object *parse_object_buffer(const unsigned char *sha1, enum object_type type, unsigned long size, void *buffer, int *eaten_p);
9f613ddd 108
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109/** Returns the object, with potentially excess memory allocated. **/
110struct object *lookup_unknown_object(const unsigned char *sha1);
111
a6080a0a 112struct object_list *object_list_insert(struct object *item,
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113 struct object_list **list_p);
114
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115int object_list_contains(struct object_list *list, struct object *obj);
116
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117/* Object array handling .. */
118void add_object_array(struct object *obj, const char *name, struct object_array *array);
9e0c3c4f 119void add_object_array_with_path(struct object *obj, const char *name, struct object_array *array, unsigned mode, const char *path);
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120
121typedef int (*object_array_each_func_t)(struct object_array_entry *, void *);
122
123/*
124 * Apply want to each entry in array, retaining only the entries for
125 * which the function returns true. Preserve the order of the entries
126 * that are retained.
127 */
128void object_array_filter(struct object_array *array,
129 object_array_each_func_t want, void *cb_data);
130
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131/*
132 * Remove from array all but the first entry with a given name.
133 * Warning: this function uses an O(N^2) algorithm.
134 */
135void object_array_remove_duplicates(struct object_array *array);
1f1e895f 136
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137/*
138 * Remove any objects from the array, freeing all used memory; afterwards
139 * the array is ready to store more objects with add_object_array().
140 */
141void object_array_clear(struct object_array *array);
142
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143void clear_object_flags(unsigned flags);
144
6eb8ae00 145#endif /* OBJECT_H */