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 packed_git *get_all_packs(struct repository *r);
  61
  62 /*
  63  * Give a rough count of objects in the repository. This sacrifices accuracy
  64  * for speed.
  65  */
  66 unsigned long repo_approximate_object_count(struct repository *r);
  67 #define approximate_object_count() repo_approximate_object_count(the_repository)
  68
  69 struct packed_git *find_sha1_pack(const unsigned char *sha1,
  70                                   struct packed_git *packs);
  71
  72 void pack_report(void);
  73
  74 /*
  75  * mmap the index file for the specified packfile (if it is not
  76  * already mmapped).  Return 0 on success.
  77  */
  78 int open_pack_index(struct packed_git *);
  79
  80 /*
  81  * munmap the index file for the specified packfile (if it is
  82  * currently mmapped).
  83  */
  84 void close_pack_index(struct packed_git *);
  85
  86 int close_pack_fd(struct packed_git *p);
  87
  88 uint32_t get_pack_fanout(struct packed_git *p, uint32_t value);
  89
  90 unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
  91 void close_pack_windows(struct packed_git *);
  92 void close_pack(struct packed_git *);
  93 void close_object_store(struct raw_object_store *o);
  94 void unuse_pack(struct pack_window **);
  95 void clear_delta_base_cache(void);
  96 struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
  97
  98 /*
  99  * Unlink the .pack and associated extension files.
 100  * Does not unlink if 'force_delete' is false and the pack-file is
 101  * marked as ".keep".
 102  */
 103 void unlink_pack_path(const char *pack_name, int force_delete);
 104
 105 /*
 106  * Make sure that a pointer access into an mmap'd index file is within bounds,
 107  * and can provide at least 8 bytes of data.
 108  *
 109  * Note that this is only necessary for variable-length segments of the file
 110  * (like the 64-bit extended offset table), as we compare the size to the
 111  * fixed-length parts when we open the file.
 112  */
 113 void check_pack_index_ptr(const struct packed_git *p, const void *ptr);
 114
 115 /*
 116  * Perform binary search on a pack-index for a given oid. Packfile is expected to
 117  * have a valid pack-index.
 118  *
 119  * See 'bsearch_hash' for more information.
 120  */
 121 int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32_t *result);
 122
 123 /*
 124  * Return the SHA-1 of the nth object within the specified packfile.
 125  * Open the index if it is not already open.  The return value points
 126  * at the SHA-1 within the mmapped index.  Return NULL if there is an
 127  * error.
 128  */
 129 const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
 130 /*
 131  * Like nth_packed_object_sha1, but write the data into the object specified by
 132  * the the first argument.  Returns the first argument on success, and NULL on
 133  * error.
 134  */
 135 const struct object_id *nth_packed_object_oid(struct object_id *, struct packed_git *, uint32_t n);
 136
 137 /*
 138  * Return the offset of the nth object within the specified packfile.
 139  * The index must already be opened.
 140  */
 141 off_t nth_packed_object_offset(const struct packed_git *, uint32_t n);
 142
 143 /*
 144  * If the object named sha1 is present in the specified packfile,
 145  * return its offset within the packfile; otherwise, return 0.
 146  */
 147 off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *);
 148
 149 int is_pack_valid(struct packed_git *);
 150 void *unpack_entry(struct repository *r, struct packed_git *, off_t, enum object_type *, unsigned long *);
 151 unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 152 unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 153 int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
 154
 155 void release_pack_memory(size_t);
 156
 157 /* global flag to enable extra checks when accessing packed objects */
 158 extern int do_check_packed_object_crc;
 159
 160 int packed_object_info(struct repository *r,
 161                        struct packed_git *pack,
 162                        off_t offset, struct object_info *);
 163
 164 void mark_bad_packed_object(struct packed_git *p, const unsigned char *sha1);
 165 const struct packed_git *has_packed_and_bad(struct repository *r, const unsigned char *sha1);
 166
 167 /*
 168  * Iff a pack file in the given repository contains the object named by sha1,
 169  * return true and store its location to e.
 170  */
 171 int find_pack_entry(struct repository *r, const struct object_id *oid, struct pack_entry *e);
 172
 173 int has_object_pack(const struct object_id *oid);
 174
 175 int has_pack_index(const unsigned char *sha1);
 176
 177 /*
 178  * Return 1 if an object in a promisor packfile is or refers to the given
 179  * object, 0 otherwise.
 180  */
 181 int is_promisor_object(const struct object_id *oid);
 182
 183 /*
 184  * Expose a function for fuzz testing.
 185  *
 186  * load_idx() parses a block of memory as a packfile index and puts the results
 187  * into a struct packed_git.
 188  *
 189  * This function should not be used directly. It is exposed here only so that we
 190  * have a convenient entry-point for fuzz testing. For real uses, you should
 191  * probably use open_pack_index() or parse_pack_index() instead.
 192  */
 193 int load_idx(const char *path, const unsigned int hashsz, void *idx_map,
 194              size_t idx_size, struct packed_git *p);
 195
 196 #endif