Fix git-diff-tree --stdin
[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_refs {
10 unsigned count;
8f1d2e6f 11 struct object *ref[FLEX_ARRAY]; /* more */
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12};
13
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14struct object_array {
15 unsigned int nr;
16 unsigned int alloc;
17 struct object_array_entry {
18 struct object *item;
19 const char *name;
e5709a4a 20 unsigned mode;
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21 } *objects;
22};
23
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24#define TYPE_BITS 3
25#define FLAG_BITS 27
26
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27/*
28 * The object type is stored in 3 bits.
29 */
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30struct object {
31 unsigned parsed : 1;
32 unsigned used : 1;
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33 unsigned type : TYPE_BITS;
34 unsigned flags : FLAG_BITS;
6eb8ae00 35 unsigned char sha1[20];
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36};
37
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38extern const char *typename(unsigned int type);
39extern int type_from_string(const char *str);
885a86ab 40
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41extern unsigned int get_max_object_index(void);
42extern struct object *get_indexed_object(unsigned int);
3e4339e6 43
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44/*
45 * This can be used to see if we have heard of the object before, but
46 * it can return "yes we have, and here is a half-initialised object"
47 * for an object that we haven't loaded/parsed yet.
48 *
49 * When parsing a commit to create an in-core commit object, its
50 * parents list holds commit objects that represent its parents, but
51 * they are expected to be lazily initialized and do not know what
52 * their trees or parents are yet. When this function returns such a
53 * half-initialised objects, the caller is expected to initialize them
54 * by calling parse_object() on them.
55 */
5d6ccf5c 56struct object *lookup_object(const unsigned char *sha1);
6eb8ae00 57
100c5f3b 58extern void *create_object(const unsigned char *sha1, int type, void *obj);
6eb8ae00 59
e9eefa67 60/** Returns the object, having parsed it to find out what it is. **/
5d6ccf5c 61struct object *parse_object(const unsigned char *sha1);
e9eefa67 62
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63/* Given the result of read_sha1_file(), returns the object after
64 * parsing it. eaten_p indicates if the object has a borrowed copy
65 * of buffer and the caller should not free() it.
66 */
21666f1a 67struct object *parse_object_buffer(const unsigned char *sha1, enum object_type type, unsigned long size, void *buffer, int *eaten_p);
9f613ddd 68
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69/** Returns the object, with potentially excess memory allocated. **/
70struct object *lookup_unknown_object(const unsigned char *sha1);
71
a6080a0a 72struct object_list *object_list_insert(struct object *item,
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73 struct object_list **list_p);
74
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75void object_list_append(struct object *item,
76 struct object_list **list_p);
77
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78unsigned object_list_length(struct object_list *list);
79
80int object_list_contains(struct object_list *list, struct object *obj);
81
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82/* Object array handling .. */
83void add_object_array(struct object *obj, const char *name, struct object_array *array);
e5709a4a 84void add_object_array_with_mode(struct object *obj, const char *name, struct object_array *array, unsigned mode);
1f1e895f 85
6eb8ae00 86#endif /* OBJECT_H */