wimlib.net Git - wimlib/blob - src/delete_image.c

   1 /*
   2  * delete_image.c
   3  */
   4
   5 /*
   6  * Copyright (C) 2012, 2013 Eric Biggers
   7  *
   8  * This file is part of wimlib, a library for working with WIM files.
   9  *
  10  * wimlib is free software; you can redistribute it and/or modify it under the
  11  * terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 3 of the License, or (at your option)
  13  * any later version.
  14  *
  15  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  16  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  17  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include "config.h"
  26 #endif
  27
  28 #include "wimlib.h"
  29 #include "wimlib/error.h"
  30 #include "wimlib/metadata.h"
  31 #include "wimlib/util.h"
  32 #include "wimlib/wim.h"
  33 #include "wimlib/xml.h"
  34
  35 /*
  36  * Deletes an image from the WIM.
  37  */
  38 WIMLIBAPI int
  39 wimlib_delete_image(WIMStruct *wim, int image)
  40 {
  41         int ret;
  42         int first, last;
  43
  44         ret = can_delete_from_wim(wim);
  45         if (ret)
  46                 return ret;
  47
  48         if (image == WIMLIB_ALL_IMAGES) {
  49                 last = wim->hdr.image_count;
  50                 first = 1;
  51         } else {
  52                 last = image;
  53                 first = image;
  54         }
  55
  56         for (image = last; image >= first; image--) {
  57                 DEBUG("Deleting image %d", image);
  58
  59                 /* Even if the dentry tree is not allocated, we must select it (and
  60                  * therefore allocate it) so that we can decrement the reference counts
  61                  * in the lookup table.  */
  62                 ret = select_wim_image(wim, image);
  63                 if (ret)
  64                         return ret;
  65
  66                 /* Unless the image metadata is shared by another WIMStruct, free the
  67                  * dentry tree, any lookup table entries that have their refcnt
  68                  * decremented to 0, and the security data. */
  69                 put_image_metadata(wim->image_metadata[image - 1], wim->lookup_table);
  70
  71                 /* Get rid of the empty slot in the image metadata array. */
  72                 for (int i = image - 1; i < wim->hdr.image_count - 1; i++)
  73                         wim->image_metadata[i] = wim->image_metadata[i + 1];
  74
  75                 /* Decrement the image count. */
  76                 --wim->hdr.image_count;
  77
  78                 /* Fix the boot index. */
  79                 if (wim->hdr.boot_idx == image)
  80                         wim->hdr.boot_idx = 0;
  81                 else if (wim->hdr.boot_idx > image)
  82                         wim->hdr.boot_idx--;
  83
  84                 wim->current_image = WIMLIB_NO_IMAGE;
  85
  86                 /* Remove the image from the XML information. */
  87                 xml_delete_image(&wim->wim_info, image);
  88
  89                 wim->deletion_occurred = 1;
  90         }
  91         return 0;
  92 }