packfile.h

   1 #ifndef PACKFILE_H
   2 #define PACKFILE_H
   3
   4 #include "oidset.h"
   5
   6 /*
   7  * Generate the filename to be used for a pack file with checksum "sha1" and
   8  * extension "ext". The result is written into the strbuf "buf", overwriting
   9  * any existing contents. A pointer to buf->buf is returned as a convenience.
  10  *
  11  * Example: odb_pack_name(out, sha1, "idx") => ".git/objects/pack/pack-1234..idx"
  12  */
  13 extern char *odb_pack_name(struct strbuf *buf, const unsigned char *sha1, const char *ext);
  14
  15 /*
  16  * Return the name of the (local) packfile with the specified sha1 in
  17  * its name.  The return value is a pointer to memory that is
  18  * overwritten each time this function is called.
  19  */
  20 extern char *sha1_pack_name(const unsigned char *sha1);
  21
  22 /*
  23  * Return the name of the (local) pack index file with the specified
  24  * sha1 in its name.  The return value is a pointer to memory that is
  25  * overwritten each time this function is called.
  26  */
  27 extern char *sha1_pack_index_name(const unsigned char *sha1);
  28
  29 extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
  30
  31 /* A hook to report invalid files in pack directory */
  32 #define PACKDIR_FILE_PACK 1
  33 #define PACKDIR_FILE_IDX 2
  34 #define PACKDIR_FILE_GARBAGE 4
  35 extern void (*report_garbage)(unsigned seen_bits, const char *path);
  36
  37 extern void reprepare_packed_git(struct repository *r);
  38 extern void install_packed_git(struct repository *r, struct packed_git *pack);
  39
  40 struct packed_git *get_packed_git(struct repository *r);
  41 struct list_head *get_packed_git_mru(struct repository *r);
  42
  43 /*
  44  * Give a rough count of objects in the repository. This sacrifices accuracy
  45  * for speed.
  46  */
  47 unsigned long approximate_object_count(void);
  48
  49 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
  50                                          struct packed_git *packs);
  51
  52 extern void pack_report(void);
  53
  54 /*
  55  * mmap the index file for the specified packfile (if it is not
  56  * already mmapped).  Return 0 on success.
  57  */
  58 extern int open_pack_index(struct packed_git *);
  59
  60 /*
  61  * munmap the index file for the specified packfile (if it is
  62  * currently mmapped).
  63  */
  64 extern void close_pack_index(struct packed_git *);
  65
  66 extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
  67 extern void close_pack_windows(struct packed_git *);
  68 extern void close_pack(struct packed_git *);
  69 extern void close_all_packs(struct raw_object_store *o);
  70 extern void unuse_pack(struct pack_window **);
  71 extern void clear_delta_base_cache(void);
  72 extern struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
  73
  74 /*
  75  * Make sure that a pointer access into an mmap'd index file is within bounds,
  76  * and can provide at least 8 bytes of data.
  77  *
  78  * Note that this is only necessary for variable-length segments of the file
  79  * (like the 64-bit extended offset table), as we compare the size to the
  80  * fixed-length parts when we open the file.
  81  */
  82 extern void check_pack_index_ptr(const struct packed_git *p, const void *ptr);
  83
  84 /*
  85  * Perform binary search on a pack-index for a given oid. Packfile is expected to
  86  * have a valid pack-index.
  87  *
  88  * See 'bsearch_hash' for more information.
  89  */
  90 int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32_t *result);
  91
  92 /*
  93  * Return the SHA-1 of the nth object within the specified packfile.
  94  * Open the index if it is not already open.  The return value points
  95  * at the SHA-1 within the mmapped index.  Return NULL if there is an
  96  * error.
  97  */
  98 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
  99 /*
 100  * Like nth_packed_object_sha1, but write the data into the object specified by
 101  * the the first argument.  Returns the first argument on success, and NULL on
 102  * error.
 103  */
 104 extern const struct object_id *nth_packed_object_oid(struct object_id *, struct packed_git *, uint32_t n);
 105
 106 /*
 107  * Return the offset of the nth object within the specified packfile.
 108  * The index must already be opened.
 109  */
 110 extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t n);
 111
 112 /*
 113  * If the object named sha1 is present in the specified packfile,
 114  * return its offset within the packfile; otherwise, return 0.
 115  */
 116 extern off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *);
 117
 118 extern int is_pack_valid(struct packed_git *);
 119 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 120 extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 121 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 122 extern int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
 123
 124 extern void release_pack_memory(size_t);
 125
 126 /* global flag to enable extra checks when accessing packed objects */
 127 extern int do_check_packed_object_crc;
 128
 129 extern int packed_object_info(struct packed_git *pack, off_t offset, struct object_info *);
 130
 131 extern void mark_bad_packed_object(struct packed_git *p, const unsigned char *sha1);
 132 extern const struct packed_git *has_packed_and_bad(const unsigned char *sha1);
 133
 134 /*
 135  * Iff a pack file in the given repository contains the object named by sha1,
 136  * return true and store its location to e.
 137  */
 138 extern int find_pack_entry(struct repository *r, const unsigned char *sha1, struct pack_entry *e);
 139
 140 extern int has_sha1_pack(const unsigned char *sha1);
 141
 142 extern int has_pack_index(const unsigned char *sha1);
 143
 144 /*
 145  * Only iterate over packs obtained from the promisor remote.
 146  */
 147 #define FOR_EACH_OBJECT_PROMISOR_ONLY 2
 148
 149 /*
 150  * Iterate over packed objects in both the local
 151  * repository and any alternates repositories (unless the
 152  * FOR_EACH_OBJECT_LOCAL_ONLY flag, defined in cache.h, is set).
 153  */
 154 typedef int each_packed_object_fn(const struct object_id *oid,
 155                                   struct packed_git *pack,
 156                                   uint32_t pos,
 157                                   void *data);
 158 extern int for_each_object_in_pack(struct packed_git *p, each_packed_object_fn, void *data);
 159 extern int for_each_packed_object(each_packed_object_fn, void *, unsigned flags);
 160
 161 /*
 162  * Return 1 if an object in a promisor packfile is or refers to the given
 163  * object, 0 otherwise.
 164  */
 165 extern int is_promisor_object(const struct object_id *oid);
 166
 167 #endif