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 char in_pack_header_size;
  21         unsigned preferred_base:1; /*
  22                                     * we do not pack this, but is available
  23                                     * to be used as the base object to delta
  24                                     * objects against.
  25                                     */
  26         unsigned no_try_delta:1;
  27         unsigned tagged:1; /* near the very tip of refs */
  28         unsigned filled:1; /* assigned write-order */
  29 };
  30
  31 struct packing_data {
  32         struct object_entry *objects;
  33         uint32_t nr_objects, nr_alloc;
  34
  35         int32_t *index;
  36         uint32_t index_size;
  37 };
  38
  39 struct object_entry *packlist_alloc(struct packing_data *pdata,
  40                                     const unsigned char *sha1,
  41                                     uint32_t index_pos);
  42
  43 struct object_entry *packlist_find(struct packing_data *pdata,
  44                                    const unsigned char *sha1,
  45                                    uint32_t *index_pos);
  46
  47 static inline uint32_t pack_name_hash(const char *name)
  48 {
  49         uint32_t c, hash = 0;
  50
  51         if (!name)
  52                 return 0;
  53
  54         /*
  55          * This effectively just creates a sortable number from the
  56          * last sixteen non-whitespace characters. Last characters
  57          * count "most", so things that end in ".c" sort together.
  58          */
  59         while ((c = *name++) != 0) {
  60                 if (isspace(c))
  61                         continue;
  62                 hash = (hash >> 2) + (c << 24);
  63         }
  64         return hash;
  65 }
  66
  67 #endif