/*
* Copyright (C) 2012, 2013 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.
+ * 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.
*
- * 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 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 "wimlib/write.h"
/*
- * Reads a metadata resource for an image in the WIM file. The metadata
- * resource consists of the security data, followed by the directory entry for
- * the root directory, followed by all the other directory entries in the
- * filesystem. The subdir_offset field of each directory entry gives the start
- * of its child entries from the beginning of the metadata resource. An
- * end-of-directory is signaled by a directory entry of length '0', really of
- * length 8, because that's how long the 'length' field is.
- *
- * @wim:
- * Pointer to the WIMStruct for the WIM file.
+ * Reads and parses a metadata resource for an image in the WIM file.
*
* @imd:
* Pointer to the image metadata structure for the image whose metadata
* WIMLIB_ERR_DECOMPRESSION
*/
int
-read_metadata_resource(WIMStruct *wim, struct wim_image_metadata *imd)
+read_metadata_resource(struct wim_image_metadata *imd)
{
+ const struct wim_lookup_table_entry *metadata_lte;
void *buf;
int ret;
+ struct wim_security_data *sd;
struct wim_dentry *root;
- const struct wim_lookup_table_entry *metadata_lte;
- u64 metadata_len;
- u8 hash[SHA1_HASH_SIZE];
- struct wim_security_data *security_data;
struct wim_inode *inode;
metadata_lte = imd->metadata_lte;
- metadata_len = metadata_lte->size;
-
- DEBUG("Reading metadata resource.");
-
- /* There is no way the metadata resource could possibly be less than (8
- * + WIM_DENTRY_DISK_SIZE) bytes, where the 8 is for security data (with
- * no security descriptors) and WIM_DENTRY_DISK_SIZE is for the root
- * entry. */
- if (metadata_len < 8 + WIM_DENTRY_DISK_SIZE) {
- ERROR("Expected at least %u bytes for the metadata resource",
- 8 + WIM_DENTRY_DISK_SIZE);
- return WIMLIB_ERR_INVALID_METADATA_RESOURCE;
- }
- /* Read the metadata resource into memory. (It may be compressed.) */
+ DEBUG("Reading metadata resource (size=%"PRIu64").", metadata_lte->size);
+
+ /* Read the metadata resource into memory. (It may be compressed.) */
ret = read_full_stream_into_alloc_buf(metadata_lte, &buf);
if (ret)
return ret;
+ /* Checksum the metadata resource. */
if (!metadata_lte->dont_check_metadata_hash) {
- sha1_buffer(buf, metadata_len, hash);
+ u8 hash[SHA1_HASH_SIZE];
+
+ sha1_buffer(buf, metadata_lte->size, hash);
if (!hashes_equal(metadata_lte->hash, hash)) {
ERROR("Metadata resource is corrupted "
"(invalid SHA-1 message digest)!");
}
}
- DEBUG("Finished reading metadata resource into memory.");
-
- ret = read_wim_security_data(buf, metadata_len, &security_data);
+ /* Parse the metadata resource.
+ *
+ * Notes: The metadata resource consists of the security data, followed
+ * by the directory entry for the root directory, followed by all the
+ * other directory entries in the filesystem. The subdir_offset field
+ * of each directory entry gives the start of its child entries from the
+ * beginning of the metadata resource. An end-of-directory is signaled
+ * by a directory entry of length '0', really of length 8, because
+ * that's how long the 'length' field is. */
+
+ ret = read_wim_security_data(buf, metadata_lte->size, &sd);
if (ret)
goto out_free_buf;
- DEBUG("Reading root dentry");
-
- /* Allocate memory for the root dentry and read it into memory */
- root = MALLOC(sizeof(struct wim_dentry));
- if (!root) {
- ret = WIMLIB_ERR_NOMEM;
- goto out_free_security_data;
- }
-
- /* The root directory entry starts after security data, aligned on an
- * 8-byte boundary within the metadata resource. Since
- * security_data->total_length was already rounded up to an 8-byte
- * boundary, its value can be used as the offset of the root directory
- * entry. */
- ret = read_dentry(buf, metadata_len,
- security_data->total_length, root);
-
- if (ret == 0 && root->length == 0) {
- WARNING("Metadata resource begins with end-of-directory entry "
- "(treating as empty image)");
- FREE(root);
- root = NULL;
- goto out_success;
- }
-
- if (ret) {
- FREE(root);
- goto out_free_security_data;
- }
-
- if (dentry_has_long_name(root) || dentry_has_short_name(root)) {
- WARNING("The root directory has a nonempty name (removing it)");
- FREE(root->file_name);
- FREE(root->short_name);
- root->file_name = NULL;
- root->short_name = NULL;
- root->file_name_nbytes = 0;
- root->short_name_nbytes = 0;
- }
-
- if (!dentry_is_directory(root)) {
- ERROR("Root of the WIM image must be a directory!");
- FREE(root);
- ret = WIMLIB_ERR_INVALID_METADATA_RESOURCE;
+ ret = read_dentry_tree(buf, metadata_lte->size, sd->total_length, &root);
+ if (ret)
goto out_free_security_data;
- }
-
- /* This is the root dentry, so set its parent to itself. */
- root->parent = root;
- inode_add_dentry(root, root->d_inode);
+ /* We have everything we need from the buffer now. */
+ FREE(buf);
+ buf = NULL;
- /* Now read the entire directory entry tree into memory. */
- DEBUG("Reading dentry tree");
- ret = read_dentry_tree(buf, metadata_len, root);
- if (ret)
- goto out_free_dentry_tree;
+ /* Calculate and validate inodes. */
- /* Build hash table that maps hard link group IDs to dentry sets */
ret = dentry_tree_fix_inodes(root, &imd->inode_list);
if (ret)
goto out_free_dentry_tree;
+ image_for_each_inode(inode, imd)
+ check_inode(inode, sd);
- DEBUG("Running miscellaneous verifications on the dentry tree");
- image_for_each_inode(inode, imd) {
- ret = verify_inode(inode, security_data);
- if (ret)
- goto out_free_dentry_tree;
- }
- DEBUG("Done reading image metadata");
-out_success:
+ /* Success; fill in the image_metadata structure. */
imd->root_dentry = root;
- imd->security_data = security_data;
+ imd->security_data = sd;
INIT_LIST_HEAD(&imd->unhashed_streams);
- ret = 0;
- goto out_free_buf;
+ DEBUG("Done parsing metadata resource.");
+ return 0;
+
out_free_dentry_tree:
- free_dentry_tree(root, wim->lookup_table);
+ free_dentry_tree(root, NULL);
out_free_security_data:
- free_wim_security_data(security_data);
+ free_wim_security_data(sd);
out_free_buf:
FREE(buf);
return ret;
int ret;
u64 subdir_offset;
struct wim_dentry *root;
- u64 len;
+ size_t len;
struct wim_security_data *sd;
struct wim_image_metadata *imd;
if (!root) {
/* Empty image; create a dummy root. */
- ret = new_filler_directory(T(""), &root);
+ ret = new_filler_directory(&root);
if (ret)
return ret;
imd->root_dentry = root;
len = subdir_offset;
/* Allocate a buffer to contain the uncompressed metadata resource. */
- buf = MALLOC(len);
+ buf = NULL;
+ if (likely(len == subdir_offset))
+ buf = MALLOC(len);
if (!buf) {
ERROR("Failed to allocate %"PRIu64" bytes for "
- "metadata resource", len);
+ "metadata resource", subdir_offset);
return WIMLIB_ERR_NOMEM;
}
git://wimlib.net / wimlib / blobdiff