rev-cache.h

   1 #ifndef REV_CACHE_H
   2 #define REV_CACHE_H
   3
   4 #define SUPPORTED_REVCACHE_VERSION              1
   5 #define SUPPORTED_REVINDEX_VERSION              1
   6 #define SUPPORTED_REVCOPTR_VERSION              1
   7
   8 #define RC_PATH_SIZE(x) (sizeof(uint16_t) * (x))
   9
  10 #define RC_OBTAIN_OBJECT_ENTRY(p)                       from_disked_rc_object_entry((struct rc_object_entry_ondisk *)(p), 0)
  11 #define RC_OBTAIN_INDEX_ENTRY(p)                        from_disked_rc_index_entry((struct rc_index_entry_ondisk *)(p), 0)
  12
  13 #define RC_ACTUAL_OBJECT_ENTRY_SIZE(e)  (\
  14         sizeof(struct rc_object_entry_ondisk) + \
  15         RC_PATH_SIZE((e)->merge_nr + (e)->split_nr) + \
  16         (e)->size_size + \
  17         (e)->name_size\
  18 )
  19 #define RC_ENTRY_SIZE_OFFSET(e)                 (RC_ACTUAL_OBJECT_ENTRY_SIZE(e) - (e)->name_size - (e)->size_size)
  20 #define RC_ENTRY_NAME_OFFSET(e)                 (RC_ACTUAL_OBJECT_ENTRY_SIZE(e) - (e)->name_size)
  21
  22 /* single index maps objects to cache files */
  23 struct rc_index_header {
  24         char signature[8]; /* REVINDEX */
  25         unsigned char version;
  26         uint32_t ofs_objects;
  27
  28         uint32_t object_nr;
  29         unsigned char cache_nr;
  30
  31         uint32_t max_date;
  32 };
  33
  34 struct rc_index_entry_ondisk {
  35         unsigned char sha1[20];
  36         unsigned char flags;
  37         uint32_t pos;
  38 };
  39
  40 struct rc_index_entry {
  41         unsigned char *sha1;
  42         unsigned is_start : 1;
  43         unsigned cache_index : 7;
  44         uint32_t pos;
  45 };
  46
  47
  48 /* structure for actual cache file */
  49 struct rc_slice_header {
  50         char signature[8]; /* REVCACHE */
  51         unsigned char version;
  52         uint32_t ofs_objects;
  53
  54         uint32_t object_nr;
  55         uint16_t path_nr;
  56         uint32_t size;
  57
  58         unsigned char sha1[20];
  59
  60         uint32_t name_size;
  61 };
  62
  63 struct rc_object_entry_ondisk {
  64         unsigned char flags;
  65         unsigned char sha1[20];
  66
  67         unsigned char merge_nr;
  68         unsigned char split_nr;
  69         unsigned char sizes;
  70
  71         uint32_t date;
  72         uint16_t path;
  73 };
  74
  75 struct rc_object_entry {
  76         unsigned type : 3;
  77         unsigned is_end : 1;
  78         unsigned is_start : 1;
  79         unsigned uninteresting : 1;
  80         unsigned include : 1;
  81         unsigned flag : 1; /* unused */
  82         unsigned char *sha1; /* 20 byte */
  83
  84         unsigned char merge_nr; /* : 7 */
  85         unsigned char split_nr; /* : 7 */
  86         unsigned size_size : 3;
  87         unsigned name_size : 3;
  88         unsigned padding : 2;
  89
  90         uint32_t date;
  91         uint16_t path;
  92
  93         /* merge paths */
  94         /* split paths */
  95         /* size */
  96         /* name id */
  97 };
  98
  99 struct rc_index_entry *from_disked_rc_index_entry(struct rc_index_entry_ondisk *src, struct rc_index_entry *dst);
 100 struct rc_index_entry_ondisk *to_disked_rc_index_entry(struct rc_index_entry *src, struct rc_index_entry_ondisk *dst);
 101 struct rc_object_entry *from_disked_rc_object_entry(struct rc_object_entry_ondisk *src, struct rc_object_entry *dst);
 102 struct rc_object_entry_ondisk *to_disked_rc_object_entry(struct rc_object_entry *src, struct rc_object_entry_ondisk *dst);
 103
 104 extern unsigned char *get_cache_slice(struct commit *commit);
 105 extern int open_cache_slice(unsigned char *sha1, int flags);
 106 extern int traverse_cache_slice(struct rev_info *revs,
 107         unsigned char *cache_sha1, struct commit *commit,
 108         unsigned long *date_so_far, int *slop_so_far,
 109         struct commit_list ***queue, struct commit_list **work);
 110
 111 extern void init_rev_cache_info(struct rev_cache_info *rci);
 112 extern int make_cache_slice(struct rev_cache_info *rci,
 113         struct rev_info *revs, struct commit_list **starts, struct commit_list **ends,
 114         unsigned char *cache_sha1);
 115 extern int make_cache_index(struct rev_cache_info *rci, unsigned char *cache_sha1,
 116         int fd, unsigned int size);
 117
 118 extern void starts_from_slices(struct rev_info *revs, unsigned int flags, unsigned char *which, int n);
 119 extern int fuse_cache_slices(struct rev_cache_info *rci, struct rev_info *revs);
 120 extern int regenerate_cache_index(struct rev_cache_info *rci);
 121 extern int make_cache_slice_pointer(struct rev_cache_info *rci, const char *slice_path);
 122
 123 #endif
 124