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[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          * State flags for depth-first search used for analyzing delta cycles.
33          */
34         enum {
35                 DFS_NONE = 0,
36                 DFS_ACTIVE,
37                 DFS_DONE
38         } dfs_state;
39 };
40
41 struct packing_data {
42         struct object_entry *objects;
43         uint32_t nr_objects, nr_alloc;
44
45         int32_t *index;
46         uint32_t index_size;
47 };
48
49 struct object_entry *packlist_alloc(struct packing_data *pdata,
50                                     const unsigned char *sha1,
51                                     uint32_t index_pos);
52
53 struct object_entry *packlist_find(struct packing_data *pdata,
54                                    const unsigned char *sha1,
55                                    uint32_t *index_pos);
56
57 static inline uint32_t pack_name_hash(const char *name)
58 {
59         uint32_t c, hash = 0;
60
61         if (!name)
62                 return 0;
63
64         /*
65          * This effectively just creates a sortable number from the
66          * last sixteen non-whitespace characters. Last characters
67          * count "most", so things that end in ".c" sort together.
68          */
69         while ((c = *name++) != 0) {
70                 if (isspace(c))
71                         continue;
72                 hash = (hash >> 2) + (c << 24);
73         }
74         return hash;
75 }
76
77 #endif