-struct wim_pair {
- WIMStruct *src_wim;
- WIMStruct *dest_wim;
- struct list_head lte_list_head;
-};
-
-static int allocate_lte_if_needed(struct dentry *dentry, void *arg)
-{
- const WIMStruct *src_wim, *dest_wim;
- struct list_head *lte_list_head;
- struct inode *inode;
-
- src_wim = ((struct wim_pair*)arg)->src_wim;
- dest_wim = ((struct wim_pair*)arg)->dest_wim;
- lte_list_head = &((struct wim_pair*)arg)->lte_list_head;
- inode = dentry->d_inode;
-
- wimlib_assert(!inode->resolved);
-
- for (unsigned i = 0; i <= inode->num_ads; i++) {
- struct lookup_table_entry *src_lte, *dest_lte;
- src_lte = inode_stream_lte_unresolved(inode, i,
- src_wim->lookup_table);
-
- if (src_lte && ++src_lte->out_refcnt == 1) {
- dest_lte = inode_stream_lte_unresolved(inode, i,
- dest_wim->lookup_table);
-
- if (!dest_lte) {
- dest_lte = clone_lookup_table_entry(src_lte);
- if (!dest_lte)
- return WIMLIB_ERR_NOMEM;
- list_add_tail(&dest_lte->staging_list, lte_list_head);
- }
- }
- }
- return 0;
-}
-
-/*
- * This function takes in a dentry that was previously located only in image(s)
- * in @src_wim, but now is being added to @dest_wim. For each stream associated
- * with the dentry, if there is already a lookup table entry for that stream in
- * the lookup table of the destination WIM file, its reference count is
- * incrementej. Otherwise, a new lookup table entry is created that points back
- * to the stream in the source WIM file (through the @hash field combined with
- * the @wim field of the lookup table entry.)
- */
-static int add_lte_to_dest_wim(struct dentry *dentry, void *arg)
-{
- WIMStruct *src_wim, *dest_wim;
- struct inode *inode;
-
- src_wim = ((struct wim_pair*)arg)->src_wim;
- dest_wim = ((struct wim_pair*)arg)->dest_wim;
- inode = dentry->d_inode;
-
- wimlib_assert(!inode->resolved);
-
- for (unsigned i = 0; i <= inode->num_ads; i++) {
- struct lookup_table_entry *src_lte, *dest_lte;
- src_lte = inode_stream_lte_unresolved(inode, i,
- src_wim->lookup_table);
-
- if (!src_lte) /* Empty or nonexistent stream. */
- continue;
-
- dest_lte = inode_stream_lte_unresolved(inode, i,
- dest_wim->lookup_table);
- if (dest_lte) {
- dest_lte->refcnt++;
- } else {
- struct list_head *lte_list_head;
- struct list_head *next;
-
- lte_list_head = &((struct wim_pair*)arg)->lte_list_head;
- wimlib_assert(!list_empty(lte_list_head));
-
- next = lte_list_head->next;
- list_del(next);
- dest_lte = container_of(next, struct lookup_table_entry,
- staging_list);
- dest_lte->part_number = 1;
- dest_lte->refcnt = 1;
- wimlib_assert(hashes_equal(dest_lte->hash, src_lte->hash));
-
- lookup_table_insert(dest_wim->lookup_table, dest_lte);
- }
- }
- return 0;
-}
-
-/*
- * Adds an image (given by its dentry tree) to the image metadata array of a WIM
- * file, adds an entry to the lookup table for the image metadata, updates the
- * image count in the header, and selects the new image.
- *
- * Does not update the XML data.
- *
- * On failure, WIMLIB_ERR_NOMEM is returned and no changes are made. Otherwise,
- * 0 is returned and the image metadata array of @w is modified.
- *
- * @w: The WIMStruct for the WIM file.
- * @root_dentry: The root of the directory tree for the image.
- * @sd: The security data for the image.
- */
-static int add_new_dentry_tree(WIMStruct *w, struct dentry *root_dentry,
- struct wim_security_data *sd)
-{
- struct lookup_table_entry *metadata_lte;
- struct image_metadata *imd;
- struct image_metadata *new_imd;
- int ret;
-
- wimlib_assert(root_dentry != NULL);
-
- DEBUG("Reallocating image metadata array for image_count = %u",
- w->hdr.image_count + 1);
- imd = CALLOC((w->hdr.image_count + 1), sizeof(struct image_metadata));
-
- if (!imd) {
- ERROR("Failed to allocate memory for new image metadata array");
- goto err;
- }
-
- memcpy(imd, w->image_metadata,
- w->hdr.image_count * sizeof(struct image_metadata));
-
- metadata_lte = new_lookup_table_entry();
- if (!metadata_lte)
- goto err_free_imd;
-
- metadata_lte->resource_entry.flags = WIM_RESHDR_FLAG_METADATA;
- random_hash(metadata_lte->hash);
- lookup_table_insert(w->lookup_table, metadata_lte);
-
- new_imd = &imd[w->hdr.image_count];
-
- new_imd->root_dentry = root_dentry;
- new_imd->metadata_lte = metadata_lte;
- new_imd->security_data = sd;
- new_imd->modified = true;
-
- FREE(w->image_metadata);
- w->image_metadata = imd;
- w->hdr.image_count++;
-
- /* Change the current image to the new one. There should not be any
- * ways for this to fail, since the image is valid and the dentry tree
- * is already in memory. */
- ret = select_wim_image(w, w->hdr.image_count);
- wimlib_assert(ret == 0);
- return ret;
-err_free_imd:
- FREE(imd);
-err:
- return WIMLIB_ERR_NOMEM;
-
-}
-
-/*
- * Copies an image, or all the images, from a WIM file, into another WIM file.
- */
-WIMLIBAPI int wimlib_export_image(WIMStruct *src_wim,
- int src_image,
- WIMStruct *dest_wim,
- const char *dest_name,
- const char *dest_description,
- int export_flags,
- WIMStruct **additional_swms,
- unsigned num_additional_swms,
- wimlib_progress_func_t progress_func)
-{
- int i;
- int ret;
- struct dentry *root;
- struct wim_pair wims;
- struct wim_security_data *sd;
- struct lookup_table *joined_tab, *src_wim_tab_save;
-
- if (dest_wim->hdr.total_parts != 1) {
- ERROR("Exporting an image to a split WIM is "
- "unsupported");
- return WIMLIB_ERR_SPLIT_UNSUPPORTED;
- }
-
- if (src_image == WIMLIB_ALL_IMAGES) {
- if (src_wim->hdr.image_count > 1) {
-
- /* multi-image export. */
-
- if ((export_flags & WIMLIB_EXPORT_FLAG_BOOT) &&
- (src_wim->hdr.boot_idx == 0))
- {
- /* Specifying the boot flag on a multi-image
- * source WIM makes the boot index default to
- * the bootable image in the source WIM. It is
- * an error if there is no such bootable image.
- * */
- ERROR("Cannot specify `boot' flag when "
- "exporting multiple images from a WIM "
- "with no bootable images");
- return WIMLIB_ERR_INVALID_PARAM;
- }
- if (dest_name || dest_description) {
- ERROR("Image name or image description was "
- "specified, but we are exporting "
- "multiple images");
- return WIMLIB_ERR_INVALID_PARAM;
- }
- for (i = 1; i <= src_wim->hdr.image_count; i++) {
- int new_flags = export_flags;
-
- if (i != src_wim->hdr.boot_idx)
- new_flags &= ~WIMLIB_EXPORT_FLAG_BOOT;
-
- ret = wimlib_export_image(src_wim, i, dest_wim,
- NULL, NULL,
- new_flags,
- additional_swms,
- num_additional_swms,
- progress_func);
- if (ret != 0)
- return ret;
- }
- return 0;
- } else if (src_wim->hdr.image_count == 1) {
- src_image = 1;
- } else {
- return 0;
- }
- }
-
- if (!dest_name) {
- dest_name = wimlib_get_image_name(src_wim, src_image);
- DEBUG("Using name `%s' for source image %d",
- dest_name, src_image);
- }
-
- if (!dest_description) {
- dest_description = wimlib_get_image_description(src_wim,
- src_image);
- DEBUG("Using description `%s' for source image %d",
- dest_description, src_image);
- }
-
- DEBUG("Exporting image %d from `%s'", src_image, src_wim->filename);
-
- if (wimlib_image_name_in_use(dest_wim, dest_name)) {
- ERROR("There is already an image named `%s' in the "
- "destination WIM", dest_name);
- return WIMLIB_ERR_IMAGE_NAME_COLLISION;
- }
-
- ret = verify_swm_set(src_wim, additional_swms, num_additional_swms);
- if (ret != 0)
- return ret;
-
- if (num_additional_swms) {
- ret = new_joined_lookup_table(src_wim, additional_swms,
- num_additional_swms,
- &joined_tab);
- if (ret != 0)
- return ret;
- src_wim_tab_save = src_wim->lookup_table;
- src_wim->lookup_table = joined_tab;
- }
-
- ret = select_wim_image(src_wim, src_image);
- if (ret != 0) {
- ERROR("Could not select image %d from the WIM `%s' "
- "to export it", src_image, src_wim->filename);
- goto out;
- }
-
- /* Pre-allocate the new lookup table entries that will be needed. This
- * way, it's not possible to run out of memory part-way through
- * modifying the lookup table of the destination WIM. */
- wims.src_wim = src_wim;
- wims.dest_wim = dest_wim;
- INIT_LIST_HEAD(&wims.lte_list_head);
- for_lookup_table_entry(src_wim->lookup_table, lte_zero_out_refcnt, NULL);
- root = wim_root_dentry(src_wim);
- for_dentry_in_tree(root, dentry_unresolve_ltes, NULL);
- ret = for_dentry_in_tree(root, allocate_lte_if_needed, &wims);
- if (ret != 0)
- goto out_free_ltes;
-
- ret = xml_export_image(src_wim->wim_info, src_image,
- &dest_wim->wim_info, dest_name, dest_description);
- if (ret != 0)
- goto out_free_ltes;
-
- sd = wim_security_data(src_wim);
- ret = add_new_dentry_tree(dest_wim, root, sd);
- if (ret != 0)
- goto out_xml_delete_image;
-
-
- /* All memory allocations have been taken care of, so it's no longer
- * possible for this function to fail. Go ahead and increment the
- * reference counts of the dentry tree and security data, then update
- * the lookup table of the destination WIM and the boot index, if
- * needed. */
- for_dentry_in_tree(root, increment_dentry_refcnt, NULL);
- sd->refcnt++;
- for_dentry_in_tree(root, add_lte_to_dest_wim, &wims);
- wimlib_assert(list_empty(&wims.lte_list_head));
-
- if (export_flags & WIMLIB_EXPORT_FLAG_BOOT) {
- DEBUG("Setting boot_idx to %d", dest_wim->hdr.image_count);
- wimlib_set_boot_idx(dest_wim, dest_wim->hdr.image_count);
- }
- ret = 0;
- goto out;
-
-out_xml_delete_image:
- xml_delete_image(&dest_wim->wim_info, dest_wim->hdr.image_count);
-out_free_ltes:
- {
- struct lookup_table_entry *lte, *tmp;
- list_for_each_entry_safe(lte, tmp, &wims.lte_list_head, staging_list)
- free_lookup_table_entry(lte);
- }
-
-out:
- if (num_additional_swms) {
- free_lookup_table(src_wim->lookup_table);
- src_wim->lookup_table = src_wim_tab_save;
- }
- return ret;
-}
-
-static int image_run_full_verifications(WIMStruct *w)
-{
- return for_dentry_in_tree(wim_root_dentry(w), verify_dentry, w);
-}
-
-static int lte_fix_refcnt(struct lookup_table_entry *lte, void *ctr)
-{
- if (lte->refcnt != lte->real_refcnt) {
- WARNING("The following lookup table entry has a reference "
- "count of %u, but", lte->refcnt);
- WARNING("We found %u references to it",
- lte->real_refcnt);
- print_lookup_table_entry(lte);
- lte->refcnt = lte->real_refcnt;
- ++*(unsigned long *)ctr;
- }
- return 0;
-}
-
-/* Ideally this would be unnecessary... however, the WIMs for Windows 8 are
- * screwed up because some lookup table entries are referenced more times than
- * their stated reference counts. So theoretically, if we delete all the
- * references to a stream and then remove it, it might still be referenced
- * somewhere else, making a file be missing from the WIM... So, work around this
- * problem by looking at ALL the images to re-calculate the reference count of
- * EVERY lookup table entry. This only absolutely has to be done before an image
- * is deleted or before an image is mounted read-write. */
-int wim_run_full_verifications(WIMStruct *w)
-{
- int ret;
-
- for_lookup_table_entry(w->lookup_table, lte_zero_real_refcnt, NULL);
- w->all_images_verified = true;
- w->full_verification_in_progress = true;
- ret = for_image(w, WIMLIB_ALL_IMAGES, image_run_full_verifications);
- w->full_verification_in_progress = false;
- if (ret == 0) {
- unsigned long num_ltes_with_bogus_refcnt = 0;
- for (int i = 0; i < w->hdr.image_count; i++)
- w->image_metadata[i].metadata_lte->real_refcnt++;
- for_lookup_table_entry(w->lookup_table, lte_fix_refcnt,
- &num_ltes_with_bogus_refcnt);
- if (num_ltes_with_bogus_refcnt != 0) {
- WARNING("A total of %lu entries in the WIM's stream "
- "lookup table had to have\n"
- " their reference counts fixed.",
- num_ltes_with_bogus_refcnt);
- }
- } else {
- w->all_images_verified = false;
- }
- return ret;
-}
-
-/*
- * Deletes an image from the WIM.
- */
-WIMLIBAPI int wimlib_delete_image(WIMStruct *w, int image)
-{
- int i;
- int ret;
-
- if (w->hdr.total_parts != 1) {
- ERROR("Deleting an image from a split WIM is not supported.");
- return WIMLIB_ERR_SPLIT_UNSUPPORTED;
- }
-
- if (image == WIMLIB_ALL_IMAGES) {
- for (i = w->hdr.image_count; i >= 1; i--) {
- ret = wimlib_delete_image(w, i);
- if (ret != 0)
- return ret;
- }
- return 0;
- }
-
- if (!w->all_images_verified) {
- ret = wim_run_full_verifications(w);
- if (ret != 0)
- return ret;
- }
-
- 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(w, image);
- if (ret != 0)
- return ret;
-
- /* Free the dentry tree, any lookup table entries that have their
- * refcnt decremented to 0, and the security data. */
- destroy_image_metadata(&w->image_metadata[image - 1], w->lookup_table);
-
- /* Get rid of the empty slot in the image metadata array. */
- memmove(&w->image_metadata[image - 1], &w->image_metadata[image],
- (w->hdr.image_count - image) * sizeof(struct image_metadata));
-
- /* Decrement the image count. */
- if (--w->hdr.image_count == 0) {
- FREE(w->image_metadata);
- w->image_metadata = NULL;
- }
-
- /* Fix the boot index. */
- if (w->hdr.boot_idx == image)
- w->hdr.boot_idx = 0;
- else if (w->hdr.boot_idx > image)
- w->hdr.boot_idx--;
-
- w->current_image = WIMLIB_NO_IMAGE;
-
- /* Remove the image from the XML information. */
- xml_delete_image(&w->wim_info, image);
-
- w->deletion_occurred = true;
- return 0;
-}
git://wimlib.net / wimlib / commitdiff