X-Git-Url: https://wimlib.net/git/?a=blobdiff_plain;f=src%2Fdelete_image.c;h=9cbec0a2ef90ba8c6ce288bbdd0b70c085dfd967;hb=2fd8bf9f1c54daa5680ad8998b2228a4db9bd6de;hp=e73efab2bd021031acd7a4cd650d2df0744d559f;hpb=28d3d79a1894375e457237097bc80f0d92746018;p=wimlib

diff --git a/src/delete_image.c b/src/delete_image.c
index e73efab2..9cbec0a2 100644
--- a/src/delete_image.c
+++ b/src/delete_image.c
@@ -3,90 +3,101 @@
  */
 
 /*
- * Copyright (C) 2012, 2013 Eric Biggers
+ * Copyright (C) 2012-2016 Eric Biggers
  *
- * This file is part of wimlib, a library for working with WIM files.
+ * This file is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation; either version 3 of the License, or (at your option) any
+ * later version.
  *
- * wimlib is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 3 of the License, or (at your option)
- * any later version.
- *
- * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- * A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * This file is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
  * details.
  *
- * You should have received a copy of the GNU General Public License
- * along with wimlib; if not, see http://www.gnu.org/licenses/.
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this file; if not, see http://www.gnu.org/licenses/.
  */
 
 #ifdef HAVE_CONFIG_H
 #  include "config.h"
 #endif
 
+#include <string.h>
+
 #include "wimlib.h"
-#include "wimlib/error.h"
+#include "wimlib/dentry.h"
 #include "wimlib/metadata.h"
-#include "wimlib/util.h"
 #include "wimlib/wim.h"
 #include "wimlib/xml.h"
 
-/*
- * Deletes an image from the WIM.
- */
-WIMLIBAPI int
-wimlib_delete_image(WIMStruct *wim, int image)
+/* Internal method for single-image deletion.  This doesn't set the
+ * image_deletion_occurred' flag on the WIMStruct.  */
+int
+delete_wim_image(WIMStruct *wim, int image)
 {
 	int ret;
-	int first, last;
+	struct wim_image_metadata *imd;
 
-	ret = can_delete_from_wim(wim);
+	/* Load the metadata for the image to be deleted.  This is necessary
+	 * because blobs referenced by files in the image need to have their
+	 * reference counts decremented.  */
+	ret = select_wim_image(wim, image);
 	if (ret)
 		return ret;
 
+	/* Release the files and decrement the reference counts of the blobs
+	 * they reference.  */
+	imd = wim->image_metadata[image - 1];
+	free_dentry_tree(imd->root_dentry, wim->blob_table);
+	imd->root_dentry = NULL;
+
+	/* Deselect the image and release its metadata.  */
+	deselect_current_wim_image(wim);
+	put_image_metadata(imd);
+
+	/* Remove the empty slot from the image metadata array.  */
+	memmove(&wim->image_metadata[image - 1], &wim->image_metadata[image],
+		(wim->hdr.image_count - image) *
+			sizeof(wim->image_metadata[0]));
+
+	/* Decrement the image count. */
+	wim->hdr.image_count--;
+
+	/* Remove the image from the XML information. */
+	xml_delete_image(wim->xml_info, image);
+
+	/* Fix the boot index. */
+	if (wim->hdr.boot_idx == image)
+		wim->hdr.boot_idx = 0;
+	else if (wim->hdr.boot_idx > image)
+		wim->hdr.boot_idx--;
+
+	return 0;
+}
+
+/* API function documented in wimlib.h  */
+WIMLIBAPI int
+wimlib_delete_image(WIMStruct *wim, int image)
+{
+	int ret;
+	int first, last;
+
 	if (image == WIMLIB_ALL_IMAGES) {
+		/* Deleting all images  */
 		last = wim->hdr.image_count;
 		first = 1;
 	} else {
+		/* Deleting one image  */
 		last = image;
 		first = image;
 	}
 
 	for (image = last; image >= first; image--) {
-		DEBUG("Deleting image %d", image);
-
-		/* Even if the dentry tree is not allocated, we must select it (and
-		 * therefore allocate it) so that we can decrement the reference counts
-		 * in the lookup table.  */
-		ret = select_wim_image(wim, image);
+		ret = delete_wim_image(wim, image);
 		if (ret)
 			return ret;
-
-		/* Unless the image metadata is shared by another WIMStruct, free the
-		 * dentry tree, any lookup table entries that have their refcnt
-		 * decremented to 0, and the security data. */
-		put_image_metadata(wim->image_metadata[image - 1], wim->lookup_table);
-
-		/* Get rid of the empty slot in the image metadata array. */
-		for (int i = image - 1; i < wim->hdr.image_count - 1; i++)
-			wim->image_metadata[i] = wim->image_metadata[i + 1];
-
-		/* Decrement the image count. */
-		--wim->hdr.image_count;
-
-		/* Fix the boot index. */
-		if (wim->hdr.boot_idx == image)
-			wim->hdr.boot_idx = 0;
-		else if (wim->hdr.boot_idx > image)
-			wim->hdr.boot_idx--;
-
-		wim->current_image = WIMLIB_NO_IMAGE;
-
-		/* Remove the image from the XML information. */
-		xml_delete_image(&wim->wim_info, image);
-
-		wim->deletion_occurred = 1;
+		wim->image_deletion_occurred = 1;
 	}
 	return 0;
 }