Merge branch 'dt/refs-backend-pre-vtable'
[git] / pack-objects.h
1 #ifndef PACK_OBJECTS_H
2 #define PACK_OBJECTS_H
3
4 struct object_entry {
5         struct pack_idx_entry idx;
6         unsigned long size;     /* uncompressed size */
7         struct packed_git *in_pack;     /* already in pack */
8         off_t in_pack_offset;
9         struct object_entry *delta;     /* delta base object */
10         struct object_entry *delta_child; /* deltified objects who bases me */
11         struct object_entry *delta_sibling; /* other deltified objects who
12                                              * uses the same base as me
13                                              */
14         void *delta_data;       /* cached delta (uncompressed) */
15         unsigned long delta_size;       /* delta data size (uncompressed) */
16         unsigned long z_delta_size;     /* delta data size (compressed) */
17         enum object_type type;
18         enum object_type in_pack_type;  /* could be delta */
19         uint32_t hash;                  /* name hint hash */
20         unsigned int in_pack_pos;
21         unsigned char in_pack_header_size;
22         unsigned preferred_base:1; /*
23                                     * we do not pack this, but is available
24                                     * to be used as the base object to delta
25                                     * objects against.
26                                     */
27         unsigned no_try_delta:1;
28         unsigned tagged:1; /* near the very tip of refs */
29         unsigned filled:1; /* assigned write-order */
30 };
31
32 struct packing_data {
33         struct object_entry *objects;
34         uint32_t nr_objects, nr_alloc;
35
36         int32_t *index;
37         uint32_t index_size;
38 };
39
40 struct object_entry *packlist_alloc(struct packing_data *pdata,
41                                     const unsigned char *sha1,
42                                     uint32_t index_pos);
43
44 struct object_entry *packlist_find(struct packing_data *pdata,
45                                    const unsigned char *sha1,
46                                    uint32_t *index_pos);
47
48 static inline uint32_t pack_name_hash(const char *name)
49 {
50         uint32_t c, hash = 0;
51
52         if (!name)
53                 return 0;
54
55         /*
56          * This effectively just creates a sortable number from the
57          * last sixteen non-whitespace characters. Last characters
58          * count "most", so things that end in ".c" sort together.
59          */
60         while ((c = *name++) != 0) {
61                 if (isspace(c))
62                         continue;
63                 hash = (hash >> 2) + (c << 24);
64         }
65         return hash;
66 }
67
68 #endif