metaentry.h

   1 /*
   2  * Various functions to work with meta entries.
   3  *
   4  * Copyright (C) 2007 David Härdeman <david@hardeman.nu>
   5  *
   6  *      This program is free software; you can redistribute it and/or modify it
   7  *      under the terms of the GNU General Public License as published by the
   8  *      Free Software Foundation version 2 of the License.
   9  *
  10  *      This program is distributed in the hope that it will be useful, but
  11  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *      General Public License for more details.
  14  *
  15  *      You should have received a copy of the GNU General Public License along
  16  *      with this program; if not, write to the Free Software Foundation, Inc.,
  17  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18  *
  19  */
  20
  21 /* Data structure to hold all metadata for a file */
  22 struct metaentry {
  23         struct metaentry *next;
  24         char *path;
  25         char *owner;
  26         char *group;
  27         mode_t mode;
  28         time_t mtime;
  29         long mtimensec;
  30         unsigned int xattrs;
  31         char **xattr_names;
  32         ssize_t *xattr_lvalues;
  33         char **xattr_values;
  34 };
  35
  36 #define HASH_INDEXES 1024
  37
  38 /* Data structure to hold a number of metadata entries */
  39 struct metahash {
  40         struct metaentry *bucket[HASH_INDEXES];
  41         unsigned int count;
  42 };
  43
  44 /* Recurses opath and adds metadata entries to the metaentry list */
  45 void mentries_recurse_path(const char *opath, struct metahash **mhash);
  46
  47 /* Stores a metaentry list to a file */
  48 void mentries_tofile(const struct metahash *mhash, const char *path);
  49
  50 /* Creates a metaentry list from a file */
  51 void mentries_fromfile(struct metahash **mhash, const char *path);
  52
  53 /* Searches haystack for an xattr matching xattr number n in needle */
  54 int mentry_find_xattr(struct metaentry *haystack,
  55                       struct metaentry *needle,
  56                       int n);
  57
  58 #define DIFF_NONE  0x00
  59 #define DIFF_OWNER 0x01
  60 #define DIFF_GROUP 0x02
  61 #define DIFF_MODE  0x04
  62 #define DIFF_TYPE  0x08
  63 #define DIFF_MTIME 0x10
  64 #define DIFF_XATTR 0x20
  65 #define DIFF_ADDED 0x40
  66 #define DIFF_DELE  0x80
  67
  68 /* Compares lists of real and stored metadata and calls pfunc for each */
  69 void mentries_compare(struct metahash *mhashreal,
  70                       struct metahash *mhashstored,
  71                       void (*pfunc)(struct metaentry *real,
  72                                     struct metaentry *stored,
  73                                     int cmp),
  74                       int do_mtime);
  75