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 extern 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 extern 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 extern char *sha1_pack_index_name(const unsigned char *sha1);
  33
  34 extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
  35
  36 typedef void each_file_in_pack_dir_fn(const char *full_path, size_t full_path_len,
  37                                       const char *file_pach, void *data);
  38 void for_each_file_in_pack_dir(const char *objdir,
  39                                each_file_in_pack_dir_fn fn,
  40                                void *data);
  41
  42 /* A hook to report invalid files in pack directory */
  43 #define PACKDIR_FILE_PACK 1
  44 #define PACKDIR_FILE_IDX 2
  45 #define PACKDIR_FILE_GARBAGE 4
  46 extern void (*report_garbage)(unsigned seen_bits, const char *path);
  47
  48 extern void reprepare_packed_git(struct repository *r);
  49 extern void install_packed_git(struct repository *r, struct packed_git *pack);
  50
  51 struct packed_git *get_packed_git(struct repository *r);
  52 struct list_head *get_packed_git_mru(struct repository *r);
  53 struct multi_pack_index *get_multi_pack_index(struct repository *r);
  54 struct packed_git *get_all_packs(struct repository *r);
  55
  56 /*
  57  * Give a rough count of objects in the repository. This sacrifices accuracy
  58  * for speed.
  59  */
  60 unsigned long repo_approximate_object_count(struct repository *r);
  61 #define approximate_object_count() repo_approximate_object_count(the_repository)
  62
  63 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
  64                                          struct packed_git *packs);
  65
  66 extern void pack_report(void);
  67
  68 /*
  69  * mmap the index file for the specified packfile (if it is not
  70  * already mmapped).  Return 0 on success.
  71  */
  72 extern int open_pack_index(struct packed_git *);
  73
  74 /*
  75  * munmap the index file for the specified packfile (if it is
  76  * currently mmapped).
  77  */
  78 extern void close_pack_index(struct packed_git *);
  79
  80 extern uint32_t get_pack_fanout(struct packed_git *p, uint32_t value);
  81
  82 extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
  83 extern void close_pack_windows(struct packed_git *);
  84 extern void close_pack(struct packed_git *);
  85 extern void close_all_packs(struct raw_object_store *o);
  86 extern void unuse_pack(struct pack_window **);
  87 extern void clear_delta_base_cache(void);
  88 extern struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
  89
  90 /*
  91  * Make sure that a pointer access into an mmap'd index file is within bounds,
  92  * and can provide at least 8 bytes of data.
  93  *
  94  * Note that this is only necessary for variable-length segments of the file
  95  * (like the 64-bit extended offset table), as we compare the size to the
  96  * fixed-length parts when we open the file.
  97  */
  98 extern void check_pack_index_ptr(const struct packed_git *p, const void *ptr);
  99
 100 /*
 101  * Perform binary search on a pack-index for a given oid. Packfile is expected to
 102  * have a valid pack-index.
 103  *
 104  * See 'bsearch_hash' for more information.
 105  */
 106 int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32_t *result);
 107
 108 /*
 109  * Return the SHA-1 of the nth object within the specified packfile.
 110  * Open the index if it is not already open.  The return value points
 111  * at the SHA-1 within the mmapped index.  Return NULL if there is an
 112  * error.
 113  */
 114 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
 115 /*
 116  * Like nth_packed_object_sha1, but write the data into the object specified by
 117  * the the first argument.  Returns the first argument on success, and NULL on
 118  * error.
 119  */
 120 extern const struct object_id *nth_packed_object_oid(struct object_id *, struct packed_git *, uint32_t n);
 121
 122 /*
 123  * Return the offset of the nth object within the specified packfile.
 124  * The index must already be opened.
 125  */
 126 extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t n);
 127
 128 /*
 129  * If the object named sha1 is present in the specified packfile,
 130  * return its offset within the packfile; otherwise, return 0.
 131  */
 132 extern off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *);
 133
 134 extern int is_pack_valid(struct packed_git *);
 135 extern void *unpack_entry(struct repository *r, struct packed_git *, off_t, enum object_type *, unsigned long *);
 136 extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 137 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 138 extern int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
 139
 140 extern void release_pack_memory(size_t);
 141
 142 /* global flag to enable extra checks when accessing packed objects */
 143 extern int do_check_packed_object_crc;
 144
 145 extern int packed_object_info(struct repository *r,
 146                               struct packed_git *pack,
 147                               off_t offset, struct object_info *);
 148
 149 extern void mark_bad_packed_object(struct packed_git *p, const unsigned char *sha1);
 150 extern const struct packed_git *has_packed_and_bad(struct repository *r, const unsigned char *sha1);
 151
 152 /*
 153  * Iff a pack file in the given repository contains the object named by sha1,
 154  * return true and store its location to e.
 155  */
 156 extern int find_pack_entry(struct repository *r, const struct object_id *oid, struct pack_entry *e);
 157
 158 extern int has_object_pack(const struct object_id *oid);
 159
 160 extern int has_pack_index(const unsigned char *sha1);
 161
 162 /*
 163  * Return 1 if an object in a promisor packfile is or refers to the given
 164  * object, 0 otherwise.
 165  */
 166 extern int is_promisor_object(const struct object_id *oid);
 167
 168 /*
 169  * Expose a function for fuzz testing.
 170  *
 171  * load_idx() parses a block of memory as a packfile index and puts the results
 172  * into a struct packed_git.
 173  *
 174  * This function should not be used directly. It is exposed here only so that we
 175  * have a convenient entry-point for fuzz testing. For real uses, you should
 176  * probably use open_pack_index() or parse_pack_index() instead.
 177  */
 178 extern int load_idx(const char *path, const unsigned int hashsz, void *idx_map,
 179                     size_t idx_size, struct packed_git *p);
 180
 181 #endif