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