packfile.h

   1 #ifndef PACKFILE_H
   2 #define PACKFILE_H
   3
   4 #include "cache.h"
   5 #include "oidset.h"
   6
   7 /* in object-store.h */
   8 struct packed_git;
   9 struct object_info;
  10
  11 /*
  12  * Generate the filename to be used for a pack file with checksum "sha1" and
  13  * extension "ext". The result is written into the strbuf "buf", overwriting
  14  * any existing contents. A pointer to buf->buf is returned as a convenience.
  15  *
  16  * Example: odb_pack_name(out, sha1, "idx") => ".git/objects/pack/pack-1234..idx"
  17  */
  18 char *odb_pack_name(struct strbuf *buf, const unsigned char *sha1, const char *ext);
  19
  20 /*
  21  * Return the name of the (local) packfile with the specified sha1 in
  22  * its name.  The return value is a pointer to memory that is
  23  * overwritten each time this function is called.
  24  */
  25 char *sha1_pack_name(const unsigned char *sha1);
  26
  27 /*
  28  * Return the name of the (local) pack index file with the specified
  29  * sha1 in its name.  The return value is a pointer to memory that is
  30  * overwritten each time this function is called.
  31  */
  32 char *sha1_pack_index_name(const unsigned char *sha1);
  33
  34 /*
  35  * Return the basename of the packfile, omitting any containing directory
  36  * (e.g., "pack-1234abcd[...].pack").
  37  */
  38 const char *pack_basename(struct packed_git *p);
  39
  40 struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
  41
  42 typedef void each_file_in_pack_dir_fn(const char *full_path, size_t full_path_len,
  43                                       const char *file_pach, void *data);
  44 void for_each_file_in_pack_dir(const char *objdir,
  45                                each_file_in_pack_dir_fn fn,
  46                                void *data);
  47
  48 /* A hook to report invalid files in pack directory */
  49 #define PACKDIR_FILE_PACK 1
  50 #define PACKDIR_FILE_IDX 2
  51 #define PACKDIR_FILE_GARBAGE 4
  52 extern void (*report_garbage)(unsigned seen_bits, const char *path);
  53
  54 void reprepare_packed_git(struct repository *r);
  55 void install_packed_git(struct repository *r, struct packed_git *pack);
  56
  57 struct packed_git *get_packed_git(struct repository *r);
  58 struct list_head *get_packed_git_mru(struct repository *r);
  59 struct multi_pack_index *get_multi_pack_index(struct repository *r);
  60 struct multi_pack_index *get_local_multi_pack_index(struct repository *r);
  61 struct packed_git *get_all_packs(struct repository *r);
  62
  63 /*
  64  * Give a rough count of objects in the repository. This sacrifices accuracy
  65  * for speed.
  66  */
  67 unsigned long repo_approximate_object_count(struct repository *r);
  68 #define approximate_object_count() repo_approximate_object_count(the_repository)
  69
  70 struct packed_git *find_sha1_pack(const unsigned char *sha1,
  71                                   struct packed_git *packs);
  72
  73 void pack_report(void);
  74
  75 /*
  76  * mmap the index file for the specified packfile (if it is not
  77  * already mmapped).  Return 0 on success.
  78  */
  79 int open_pack_index(struct packed_git *);
  80
  81 /*
  82  * munmap the index file for the specified packfile (if it is
  83  * currently mmapped).
  84  */
  85 void close_pack_index(struct packed_git *);
  86
  87 int close_pack_fd(struct packed_git *p);
  88
  89 uint32_t get_pack_fanout(struct packed_git *p, uint32_t value);
  90
  91 unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
  92 void close_pack_windows(struct packed_git *);
  93 void close_pack(struct packed_git *);
  94 void close_object_store(struct raw_object_store *o);
  95 void unuse_pack(struct pack_window **);
  96 void clear_delta_base_cache(void);
  97 struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
  98
  99 /*
 100  * Unlink the .pack and associated extension files.
 101  * Does not unlink if 'force_delete' is false and the pack-file is
 102  * marked as ".keep".
 103  */
 104 void unlink_pack_path(const char *pack_name, int force_delete);
 105
 106 /*
 107  * Make sure that a pointer access into an mmap'd index file is within bounds,
 108  * and can provide at least 8 bytes of data.
 109  *
 110  * Note that this is only necessary for variable-length segments of the file
 111  * (like the 64-bit extended offset table), as we compare the size to the
 112  * fixed-length parts when we open the file.
 113  */
 114 void check_pack_index_ptr(const struct packed_git *p, const void *ptr);
 115
 116 /*
 117  * Perform binary search on a pack-index for a given oid. Packfile is expected to
 118  * have a valid pack-index.
 119  *
 120  * See 'bsearch_hash' for more information.
 121  */
 122 int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32_t *result);
 123
 124 /*
 125  * Write the oid of the nth object within the specified packfile into the first
 126  * parameter. Open the index if it is not already open.  Returns 0 on success,
 127  * negative otherwise.
 128  */
 129 int nth_packed_object_id(struct object_id *, struct packed_git *, uint32_t n);
 130
 131 /*
 132  * Return the offset of the nth object within the specified packfile.
 133  * The index must already be opened.
 134  */
 135 off_t nth_packed_object_offset(const struct packed_git *, uint32_t n);
 136
 137 /*
 138  * If the object named sha1 is present in the specified packfile,
 139  * return its offset within the packfile; otherwise, return 0.
 140  */
 141 off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *);
 142
 143 int is_pack_valid(struct packed_git *);
 144 void *unpack_entry(struct repository *r, struct packed_git *, off_t, enum object_type *, unsigned long *);
 145 unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 146 unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 147 int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
 148 off_t get_delta_base(struct packed_git *p, struct pack_window **w_curs,
 149                      off_t *curpos, enum object_type type,
 150                      off_t delta_obj_offset);
 151
 152 void release_pack_memory(size_t);
 153
 154 /* global flag to enable extra checks when accessing packed objects */
 155 extern int do_check_packed_object_crc;
 156
 157 int packed_object_info(struct repository *r,
 158                        struct packed_git *pack,
 159                        off_t offset, struct object_info *);
 160
 161 void mark_bad_packed_object(struct packed_git *p, const unsigned char *sha1);
 162 const struct packed_git *has_packed_and_bad(struct repository *r, const unsigned char *sha1);
 163
 164 /*
 165  * Iff a pack file in the given repository contains the object named by sha1,
 166  * return true and store its location to e.
 167  */
 168 int find_pack_entry(struct repository *r, const struct object_id *oid, struct pack_entry *e);
 169
 170 int has_object_pack(const struct object_id *oid);
 171
 172 int has_pack_index(const unsigned char *sha1);
 173
 174 /*
 175  * Return 1 if an object in a promisor packfile is or refers to the given
 176  * object, 0 otherwise.
 177  */
 178 int is_promisor_object(const struct object_id *oid);
 179
 180 /*
 181  * Expose a function for fuzz testing.
 182  *
 183  * load_idx() parses a block of memory as a packfile index and puts the results
 184  * into a struct packed_git.
 185  *
 186  * This function should not be used directly. It is exposed here only so that we
 187  * have a convenient entry-point for fuzz testing. For real uses, you should
 188  * probably use open_pack_index() or parse_pack_index() instead.
 189  */
 190 int load_idx(const char *path, const unsigned int hashsz, void *idx_map,
 191              size_t idx_size, struct packed_git *p);
 192
 193 #endif