4 * A dentry (directory entry) contains the metadata for a file. In the WIM file
5 * format, the dentries are stored in the "metadata resource" section right
6 * after the security data. Each image in the WIM file has its own metadata
7 * resource with its own security data and dentry tree. Dentries in different
8 * images may share file resources by referring to the same lookup table
13 * Copyright (C) 2012 Eric Biggers
15 * This file is part of wimlib, a library for working with WIM files.
17 * wimlib is free software; you can redistribute it and/or modify it under the
18 * terms of the GNU General Public License as published by the Free Software
19 * Foundation; either version 3 of the License, or (at your option) any later
22 * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
23 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
24 * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License along with
27 * wimlib; if not, see http://www.gnu.org/licenses/.
37 #include "lookup_table.h"
39 #include "timestamp.h"
40 #include "wimlib_internal.h"
43 /* Calculates the unaligned length, in bytes, of an on-disk WIM dentry that has
44 * a file name and short name that take the specified numbers of bytes. This
45 * excludes any alternate data stream entries that may follow the dentry. */
46 static u64 __dentry_correct_length_unaligned(u16 file_name_len,
49 u64 length = WIM_DENTRY_DISK_SIZE;
51 length += file_name_len + 2;
53 length += short_name_len + 2;
57 /* Calculates the unaligned length, in bytes, of an on-disk WIM dentry, based on
58 * the file name length and short name length. Note that dentry->length is
59 * ignored; also, this excludes any alternate data stream entries that may
60 * follow the dentry. */
61 static u64 dentry_correct_length_unaligned(const struct dentry *dentry)
63 return __dentry_correct_length_unaligned(dentry->file_name_len,
64 dentry->short_name_len);
67 /* Return the "correct" value to write in the length field of a WIM dentry,
68 * based on the file name length and short name length. */
69 static u64 dentry_correct_length(const struct dentry *dentry)
71 return (dentry_correct_length_unaligned(dentry) + 7) & ~7;
74 /* Return %true iff @dentry has the UTF-8 file name @name that has length
76 static bool dentry_has_name(const struct dentry *dentry, const char *name,
79 if (dentry->file_name_utf8_len != name_len)
81 return memcmp(dentry->file_name_utf8, name, name_len) == 0;
84 /* Return %true iff the alternate data stream entry @entry has the UTF-8 stream
85 * name @name that has length @name_len bytes. */
86 static inline bool ads_entry_has_name(const struct ads_entry *entry,
87 const char *name, size_t name_len)
89 if (entry->stream_name_utf8_len != name_len)
91 return memcmp(entry->stream_name_utf8, name, name_len) == 0;
94 /* Duplicates a UTF-8 name into UTF-8 and UTF-16 strings and returns the strings
95 * and their lengths in the pointer arguments */
96 int get_names(char **name_utf16_ret, char **name_utf8_ret,
97 u16 *name_utf16_len_ret, u16 *name_utf8_len_ret,
102 char *name_utf16, *name_utf8;
104 utf8_len = strlen(name);
106 name_utf16 = utf8_to_utf16(name, utf8_len, &utf16_len);
109 return WIMLIB_ERR_NOMEM;
111 name_utf8 = MALLOC(utf8_len + 1);
114 return WIMLIB_ERR_NOMEM;
116 memcpy(name_utf8, name, utf8_len + 1);
117 FREE(*name_utf8_ret);
118 FREE(*name_utf16_ret);
119 *name_utf8_ret = name_utf8;
120 *name_utf16_ret = name_utf16;
121 *name_utf8_len_ret = utf8_len;
122 *name_utf16_len_ret = utf16_len;
126 /* Changes the name of a dentry to @new_name. Only changes the file_name and
127 * file_name_utf8 fields; does not change the short_name, short_name_utf8, or
128 * full_path_utf8 fields. Also recalculates its length. */
129 static int change_dentry_name(struct dentry *dentry, const char *new_name)
133 ret = get_names(&dentry->file_name, &dentry->file_name_utf8,
134 &dentry->file_name_len, &dentry->file_name_utf8_len,
136 FREE(dentry->short_name);
137 dentry->short_name_len = 0;
139 dentry->length = dentry_correct_length(dentry);
144 * Changes the name of an alternate data stream */
145 static int change_ads_name(struct ads_entry *entry, const char *new_name)
147 return get_names(&entry->stream_name, &entry->stream_name_utf8,
148 &entry->stream_name_len,
149 &entry->stream_name_utf8_len,
153 /* Returns the total length of a WIM alternate data stream entry on-disk,
154 * including the stream name, the null terminator, AND the padding after the
155 * entry to align the next one (or the next dentry) on an 8-byte boundary. */
156 static u64 ads_entry_total_length(const struct ads_entry *entry)
158 u64 len = WIM_ADS_ENTRY_DISK_SIZE;
159 if (entry->stream_name_len)
160 len += entry->stream_name_len + 2;
161 return (len + 7) & ~7;
165 static u64 __dentry_total_length(const struct dentry *dentry, u64 length)
167 const struct inode *inode = dentry->d_inode;
168 for (u16 i = 0; i < inode->num_ads; i++)
169 length += ads_entry_total_length(&inode->ads_entries[i]);
170 return (length + 7) & ~7;
173 /* Calculate the aligned *total* length of an on-disk WIM dentry. This includes
174 * all alternate data streams. */
175 u64 dentry_correct_total_length(const struct dentry *dentry)
177 return __dentry_total_length(dentry,
178 dentry_correct_length_unaligned(dentry));
181 /* Like dentry_correct_total_length(), but use the existing dentry->length field
182 * instead of calculating its "correct" value. */
183 static u64 dentry_total_length(const struct dentry *dentry)
185 return __dentry_total_length(dentry, dentry->length);
188 /* Transfers file attributes from a `stat' buffer to a WIM "inode". */
189 void stbuf_to_inode(const struct stat *stbuf, struct inode *inode)
191 if (S_ISLNK(stbuf->st_mode)) {
192 inode->attributes = FILE_ATTRIBUTE_REPARSE_POINT;
193 inode->reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK;
194 } else if (S_ISDIR(stbuf->st_mode)) {
195 inode->attributes = FILE_ATTRIBUTE_DIRECTORY;
197 inode->attributes = FILE_ATTRIBUTE_NORMAL;
199 if (sizeof(ino_t) >= 8)
200 inode->ino = (u64)stbuf->st_ino;
202 inode->ino = (u64)stbuf->st_ino |
203 ((u64)stbuf->st_dev << ((sizeof(ino_t) * 8) & 63));
205 inode->creation_time = timespec_to_wim_timestamp(&stbuf->st_mtim);
206 inode->last_write_time = timespec_to_wim_timestamp(&stbuf->st_mtim);
207 inode->last_access_time = timespec_to_wim_timestamp(&stbuf->st_atim);
211 /* Transfers file attributes from a struct inode to a `stat' buffer.
213 * The lookup table entry tells us which stream in the inode we are statting.
214 * For a named data stream, everything returned is the same as the unnamed data
215 * stream except possibly the size and block count. */
216 int inode_to_stbuf(const struct inode *inode, struct lookup_table_entry *lte,
219 if (inode_is_symlink(inode))
220 stbuf->st_mode = S_IFLNK | 0777;
221 else if (inode_is_directory(inode))
222 stbuf->st_mode = S_IFDIR | 0755;
224 stbuf->st_mode = S_IFREG | 0644;
226 stbuf->st_ino = (ino_t)inode->ino;
227 stbuf->st_nlink = inode->link_count;
228 stbuf->st_uid = getuid();
229 stbuf->st_gid = getgid();
232 if (lte->resource_location == RESOURCE_IN_STAGING_FILE) {
233 wimlib_assert(lte->staging_file_name);
234 struct stat native_stat;
235 if (stat(lte->staging_file_name, &native_stat) != 0) {
236 DEBUG("Failed to stat `%s': %m",
237 lte->staging_file_name);
240 stbuf->st_size = native_stat.st_size;
242 stbuf->st_size = wim_resource_size(lte);
248 stbuf->st_atime = wim_timestamp_to_unix(inode->last_access_time);
249 stbuf->st_mtime = wim_timestamp_to_unix(inode->last_write_time);
250 stbuf->st_ctime = wim_timestamp_to_unix(inode->creation_time);
251 stbuf->st_blocks = (stbuf->st_size + 511) / 512;
257 * Calls a function on all directory entries in a directory tree. It is called
258 * on a parent before its children.
260 int for_dentry_in_tree(struct dentry *root,
261 int (*visitor)(struct dentry*, void*), void *arg)
264 struct dentry *child;
266 ret = visitor(root, arg);
271 child = root->d_inode->children;
277 ret = for_dentry_in_tree(child, visitor, arg);
281 } while (child != root->d_inode->children);
286 * Like for_dentry_in_tree(), but the visitor function is always called on a
287 * dentry's children before on itself.
289 int for_dentry_in_tree_depth(struct dentry *root,
290 int (*visitor)(struct dentry*, void*), void *arg)
293 struct dentry *child;
296 child = root->d_inode->children;
300 ret = for_dentry_in_tree_depth(child, visitor, arg);
304 } while (child != root->d_inode->children);
306 return visitor(root, arg);
310 * Calculate the full path of @dentry, based on its parent's full path and on
311 * its UTF-8 file name.
313 int calculate_dentry_full_path(struct dentry *dentry, void *ignore)
317 if (dentry_is_root(dentry)) {
318 full_path = MALLOC(2);
325 char *parent_full_path;
326 u32 parent_full_path_len;
327 const struct dentry *parent = dentry->parent;
329 if (dentry_is_root(parent)) {
330 parent_full_path = "";
331 parent_full_path_len = 0;
333 parent_full_path = parent->full_path_utf8;
334 parent_full_path_len = parent->full_path_utf8_len;
337 full_path_len = parent_full_path_len + 1 +
338 dentry->file_name_utf8_len;
339 full_path = MALLOC(full_path_len + 1);
343 memcpy(full_path, parent_full_path, parent_full_path_len);
344 full_path[parent_full_path_len] = '/';
345 memcpy(full_path + parent_full_path_len + 1,
346 dentry->file_name_utf8,
347 dentry->file_name_utf8_len);
348 full_path[full_path_len] = '\0';
350 FREE(dentry->full_path_utf8);
351 dentry->full_path_utf8 = full_path;
352 dentry->full_path_utf8_len = full_path_len;
355 ERROR("Out of memory while calculating dentry full path");
356 return WIMLIB_ERR_NOMEM;
360 * Recursively calculates the subdir offsets for a directory tree.
362 * @dentry: The root of the directory tree.
363 * @subdir_offset_p: The current subdirectory offset; i.e., the subdirectory
364 * offset for @dentry.
366 void calculate_subdir_offsets(struct dentry *dentry, u64 *subdir_offset_p)
368 struct dentry *child, *children;
370 children = dentry->d_inode->children;
372 dentry->subdir_offset = *subdir_offset_p;
375 /* Advance the subdir offset by the amount of space the children
376 * of this dentry take up. */
378 *subdir_offset_p += dentry_correct_total_length(child);
380 } while (child != children);
382 /* End-of-directory dentry on disk. */
383 *subdir_offset_p += 8;
385 /* Recursively call calculate_subdir_offsets() on all the
388 calculate_subdir_offsets(child, subdir_offset_p);
390 } while (child != children);
392 /* On disk, childless directories have a valid subdir_offset
393 * that points to an 8-byte end-of-directory dentry. Regular
394 * files or reparse points have a subdir_offset of 0. */
395 if (dentry_is_directory(dentry))
396 *subdir_offset_p += 8;
398 dentry->subdir_offset = 0;
402 /* Returns the child of @dentry that has the file name @name.
403 * Returns NULL if no child has the name. */
404 struct dentry *get_dentry_child_with_name(const struct dentry *dentry,
407 struct dentry *child;
410 child = dentry->d_inode->children;
412 name_len = strlen(name);
414 if (dentry_has_name(child, name, name_len))
417 } while (child != dentry->d_inode->children);
422 /* Retrieves the dentry that has the UTF-8 @path relative to the dentry
423 * @cur_dir. Returns NULL if no dentry having the path is found. */
424 static struct dentry *get_dentry_relative_path(struct dentry *cur_dir,
427 struct dentry *child, *children;
429 const char *new_path;
434 children = cur_dir->d_inode->children;
436 new_path = path_next_part(path, &base_len);
439 if (dentry_has_name(child, path, base_len))
440 return get_dentry_relative_path(child, new_path);
442 } while (child != children);
447 /* Returns the dentry corresponding to the UTF-8 @path, or NULL if there is no
449 struct dentry *get_dentry(WIMStruct *w, const char *path)
451 struct dentry *root = wim_root_dentry(w);
454 return get_dentry_relative_path(root, path);
457 struct inode *wim_pathname_to_inode(WIMStruct *w, const char *path)
459 struct dentry *dentry;
460 dentry = get_dentry(w, path);
462 return dentry->d_inode;
467 /* Returns the dentry that corresponds to the parent directory of @path, or NULL
468 * if the dentry is not found. */
469 struct dentry *get_parent_dentry(WIMStruct *w, const char *path)
471 size_t path_len = strlen(path);
472 char buf[path_len + 1];
474 memcpy(buf, path, path_len + 1);
476 to_parent_name(buf, path_len);
478 return get_dentry(w, buf);
481 /* Prints the full path of a dentry. */
482 int print_dentry_full_path(struct dentry *dentry, void *ignore)
484 if (dentry->full_path_utf8)
485 puts(dentry->full_path_utf8);
489 /* We want to be able to show the names of the file attribute flags that are
491 struct file_attr_flag {
495 struct file_attr_flag file_attr_flags[] = {
496 {FILE_ATTRIBUTE_READONLY, "READONLY"},
497 {FILE_ATTRIBUTE_HIDDEN, "HIDDEN"},
498 {FILE_ATTRIBUTE_SYSTEM, "SYSTEM"},
499 {FILE_ATTRIBUTE_DIRECTORY, "DIRECTORY"},
500 {FILE_ATTRIBUTE_ARCHIVE, "ARCHIVE"},
501 {FILE_ATTRIBUTE_DEVICE, "DEVICE"},
502 {FILE_ATTRIBUTE_NORMAL, "NORMAL"},
503 {FILE_ATTRIBUTE_TEMPORARY, "TEMPORARY"},
504 {FILE_ATTRIBUTE_SPARSE_FILE, "SPARSE_FILE"},
505 {FILE_ATTRIBUTE_REPARSE_POINT, "REPARSE_POINT"},
506 {FILE_ATTRIBUTE_COMPRESSED, "COMPRESSED"},
507 {FILE_ATTRIBUTE_OFFLINE, "OFFLINE"},
508 {FILE_ATTRIBUTE_NOT_CONTENT_INDEXED,"NOT_CONTENT_INDEXED"},
509 {FILE_ATTRIBUTE_ENCRYPTED, "ENCRYPTED"},
510 {FILE_ATTRIBUTE_VIRTUAL, "VIRTUAL"},
513 /* Prints a directory entry. @lookup_table is a pointer to the lookup table, if
514 * available. If the dentry is unresolved and the lookup table is NULL, the
515 * lookup table entries will not be printed. Otherwise, they will be. */
516 int print_dentry(struct dentry *dentry, void *lookup_table)
519 struct lookup_table_entry *lte;
520 const struct inode *inode = dentry->d_inode;
524 printf("[DENTRY]\n");
525 printf("Length = %"PRIu64"\n", dentry->length);
526 printf("Attributes = 0x%x\n", inode->attributes);
527 for (unsigned i = 0; i < ARRAY_LEN(file_attr_flags); i++)
528 if (file_attr_flags[i].flag & inode->attributes)
529 printf(" FILE_ATTRIBUTE_%s is set\n",
530 file_attr_flags[i].name);
531 printf("Security ID = %d\n", inode->security_id);
532 printf("Subdir offset = %"PRIu64"\n", dentry->subdir_offset);
534 /* Translate the timestamps into something readable */
535 time = wim_timestamp_to_unix(inode->creation_time);
536 p = asctime(gmtime(&time));
537 *(strrchr(p, '\n')) = '\0';
538 printf("Creation Time = %s UTC\n", p);
540 time = wim_timestamp_to_unix(inode->last_access_time);
541 p = asctime(gmtime(&time));
542 *(strrchr(p, '\n')) = '\0';
543 printf("Last Access Time = %s UTC\n", p);
545 time = wim_timestamp_to_unix(inode->last_write_time);
546 p = asctime(gmtime(&time));
547 *(strrchr(p, '\n')) = '\0';
548 printf("Last Write Time = %s UTC\n", p);
550 printf("Reparse Tag = 0x%"PRIx32"\n", inode->reparse_tag);
551 printf("Hard Link Group = 0x%"PRIx64"\n", inode->ino);
552 printf("Hard Link Group Size = %"PRIu32"\n", inode->link_count);
553 printf("Number of Alternate Data Streams = %hu\n", inode->num_ads);
554 printf("Filename = \"");
555 print_string(dentry->file_name, dentry->file_name_len);
557 printf("Filename Length = %hu\n", dentry->file_name_len);
558 printf("Filename (UTF-8) = \"%s\"\n", dentry->file_name_utf8);
559 printf("Filename (UTF-8) Length = %hu\n", dentry->file_name_utf8_len);
560 printf("Short Name = \"");
561 print_string(dentry->short_name, dentry->short_name_len);
563 printf("Short Name Length = %hu\n", dentry->short_name_len);
564 printf("Full Path (UTF-8) = \"%s\"\n", dentry->full_path_utf8);
565 lte = inode_stream_lte(dentry->d_inode, 0, lookup_table);
567 print_lookup_table_entry(lte);
569 hash = inode_stream_hash(inode, 0);
577 for (u16 i = 0; i < inode->num_ads; i++) {
578 printf("[Alternate Stream Entry %u]\n", i);
579 printf("Name = \"%s\"\n", inode->ads_entries[i].stream_name_utf8);
580 printf("Name Length (UTF-16) = %u\n",
581 inode->ads_entries[i].stream_name_len);
582 hash = inode_stream_hash(inode, i + 1);
588 print_lookup_table_entry(inode_stream_lte(inode, i + 1,
594 /* Initializations done on every `struct dentry'. */
595 static void dentry_common_init(struct dentry *dentry)
597 memset(dentry, 0, sizeof(struct dentry));
601 static struct inode *new_timeless_inode()
603 struct inode *inode = CALLOC(1, sizeof(struct inode));
605 inode->security_id = -1;
606 inode->link_count = 1;
608 inode->next_stream_id = 1;
610 INIT_LIST_HEAD(&inode->dentry_list);
615 static struct inode *new_inode()
617 struct inode *inode = new_timeless_inode();
619 u64 now = get_wim_timestamp();
620 inode->creation_time = now;
621 inode->last_access_time = now;
622 inode->last_write_time = now;
628 * Creates an unlinked directory entry.
630 * @name: The UTF-8 filename of the new dentry.
632 * Returns a pointer to the new dentry, or NULL if out of memory.
634 struct dentry *new_dentry(const char *name)
636 struct dentry *dentry;
638 dentry = MALLOC(sizeof(struct dentry));
642 dentry_common_init(dentry);
643 if (change_dentry_name(dentry, name) != 0)
646 dentry->next = dentry;
647 dentry->prev = dentry;
648 dentry->parent = dentry;
653 ERROR("Failed to allocate new dentry");
658 static struct dentry *__new_dentry_with_inode(const char *name, bool timeless)
660 struct dentry *dentry;
661 dentry = new_dentry(name);
664 dentry->d_inode = new_timeless_inode();
666 dentry->d_inode = new_inode();
667 if (dentry->d_inode) {
668 inode_add_dentry(dentry, dentry->d_inode);
677 struct dentry *new_dentry_with_timeless_inode(const char *name)
679 return __new_dentry_with_inode(name, true);
682 struct dentry *new_dentry_with_inode(const char *name)
684 return __new_dentry_with_inode(name, false);
688 static int init_ads_entry(struct ads_entry *ads_entry, const char *name)
691 memset(ads_entry, 0, sizeof(*ads_entry));
693 ret = change_ads_name(ads_entry, name);
697 static void destroy_ads_entry(struct ads_entry *ads_entry)
699 FREE(ads_entry->stream_name);
700 FREE(ads_entry->stream_name_utf8);
704 /* Frees an inode. */
705 void free_inode(struct inode *inode)
708 if (inode->ads_entries) {
709 for (u16 i = 0; i < inode->num_ads; i++)
710 destroy_ads_entry(&inode->ads_entries[i]);
711 FREE(inode->ads_entries);
714 wimlib_assert(inode->num_opened_fds == 0);
717 FREE(inode->extracted_file);
722 /* Decrements link count on an inode and frees it if the link count reaches 0.
724 static void put_inode(struct inode *inode)
726 wimlib_assert(inode);
727 wimlib_assert(inode->link_count);
728 if (--inode->link_count == 0) {
730 if (inode->num_opened_fds == 0)
738 /* Frees a WIM dentry.
740 * The inode is freed only if its link count is decremented to 0.
742 void free_dentry(struct dentry *dentry)
744 wimlib_assert(dentry != NULL);
745 FREE(dentry->file_name);
746 FREE(dentry->file_name_utf8);
747 FREE(dentry->short_name);
748 FREE(dentry->full_path_utf8);
750 put_inode(dentry->d_inode);
754 void put_dentry(struct dentry *dentry)
756 wimlib_assert(dentry != NULL);
757 wimlib_assert(dentry->refcnt != 0);
759 if (--dentry->refcnt == 0)
764 * This function is passed as an argument to for_dentry_in_tree_depth() in order
765 * to free a directory tree. __args is a pointer to a `struct free_dentry_args'.
767 static int do_free_dentry(struct dentry *dentry, void *__lookup_table)
769 struct lookup_table *lookup_table = __lookup_table;
773 struct lookup_table_entry *lte;
774 struct inode *inode = dentry->d_inode;
775 wimlib_assert(inode->link_count);
776 for (i = 0; i <= inode->num_ads; i++) {
777 lte = inode_stream_lte(inode, i, lookup_table);
779 lte_decrement_refcnt(lte, lookup_table);
788 * Unlinks and frees a dentry tree.
790 * @root: The root of the tree.
791 * @lookup_table: The lookup table for dentries. If non-NULL, the
792 * reference counts in the lookup table for the lookup
793 * table entries corresponding to the dentries will be
796 void free_dentry_tree(struct dentry *root, struct lookup_table *lookup_table)
798 if (!root || !root->parent)
800 for_dentry_in_tree_depth(root, do_free_dentry, lookup_table);
803 int increment_dentry_refcnt(struct dentry *dentry, void *ignore)
810 * Links a dentry into the directory tree.
812 * @dentry: The dentry to link.
813 * @parent: The dentry that will be the parent of @dentry.
815 void link_dentry(struct dentry *dentry, struct dentry *parent)
817 wimlib_assert(dentry_is_directory(parent));
818 dentry->parent = parent;
819 if (parent->d_inode->children) {
820 /* Not an only child; link to siblings. */
821 dentry->next = parent->d_inode->children;
822 dentry->prev = parent->d_inode->children->prev;
823 dentry->next->prev = dentry;
824 dentry->prev->next = dentry;
826 /* Only child; link to parent. */
827 parent->d_inode->children = dentry;
828 dentry->next = dentry;
829 dentry->prev = dentry;
836 * Unlink a dentry from the directory tree.
838 * Note: This merely removes it from the in-memory tree structure.
840 void unlink_dentry(struct dentry *dentry)
842 if (dentry_is_root(dentry))
844 if (dentry_is_only_child(dentry)) {
845 dentry->parent->d_inode->children = NULL;
847 if (dentry_is_first_sibling(dentry))
848 dentry->parent->d_inode->children = dentry->next;
849 dentry->next->prev = dentry->prev;
850 dentry->prev->next = dentry->next;
855 static inline struct dentry *inode_first_dentry(struct inode *inode)
857 wimlib_assert(inode->dentry_list.next != &inode->dentry_list);
858 return container_of(inode->dentry_list.next, struct dentry,
862 static int verify_inode(struct inode *inode, const WIMStruct *w)
864 const struct lookup_table *table = w->lookup_table;
865 const struct wim_security_data *sd = wim_const_security_data(w);
866 const struct dentry *first_dentry = inode_first_dentry(inode);
867 int ret = WIMLIB_ERR_INVALID_DENTRY;
869 /* Check the security ID */
870 if (inode->security_id < -1) {
871 ERROR("Dentry `%s' has an invalid security ID (%d)",
872 first_dentry->full_path_utf8, inode->security_id);
875 if (inode->security_id >= sd->num_entries) {
876 ERROR("Dentry `%s' has an invalid security ID (%d) "
877 "(there are only %u entries in the security table)",
878 first_dentry->full_path_utf8, inode->security_id,
883 /* Check that lookup table entries for all the resources exist, except
884 * if the SHA1 message digest is all 0's, which indicates there is
885 * intentionally no resource there. */
886 if (w->hdr.total_parts == 1) {
887 for (unsigned i = 0; i <= inode->num_ads; i++) {
888 struct lookup_table_entry *lte;
890 hash = inode_stream_hash_unresolved(inode, i);
891 lte = __lookup_resource(table, hash);
892 if (!lte && !is_zero_hash(hash)) {
893 ERROR("Could not find lookup table entry for stream "
894 "%u of dentry `%s'", i, first_dentry->full_path_utf8);
897 if (lte && (lte->real_refcnt += inode->link_count) > lte->refcnt)
899 #ifdef ENABLE_ERROR_MESSAGES
900 WARNING("The following lookup table entry "
901 "has a reference count of %u, but",
903 WARNING("We found %u references to it",
905 WARNING("(One dentry referencing it is at `%s')",
906 first_dentry->full_path_utf8);
908 print_lookup_table_entry(lte);
910 /* Guess what! install.wim for Windows 8
911 * contains a stream with 2 dentries referencing
912 * it, but the lookup table entry has reference
913 * count of 1. So we will need to handle this
914 * case and not just make it be an error... I'm
915 * just setting the reference count to the
916 * number of references we found.
917 * (Unfortunately, even after doing this, the
918 * reference count could be too low if it's also
919 * referenced in other WIM images) */
922 lte->refcnt = lte->real_refcnt;
923 WARNING("Fixing reference count");
931 /* Make sure there is only one un-named stream. */
932 unsigned num_unnamed_streams = 0;
933 for (unsigned i = 0; i <= inode->num_ads; i++) {
935 hash = inode_stream_hash_unresolved(inode, i);
936 if (!inode_stream_name_len(inode, i) && !is_zero_hash(hash))
937 num_unnamed_streams++;
939 if (num_unnamed_streams > 1) {
940 ERROR("Dentry `%s' has multiple (%u) un-named streams",
941 first_dentry->full_path_utf8, num_unnamed_streams);
944 inode->verified = true;
950 /* Run some miscellaneous verifications on a WIM dentry */
951 int verify_dentry(struct dentry *dentry, void *wim)
955 if (!dentry->d_inode->verified) {
956 ret = verify_inode(dentry->d_inode, wim);
961 /* Cannot have a short name but no long name */
962 if (dentry->short_name_len && !dentry->file_name_len) {
963 ERROR("Dentry `%s' has a short name but no long name",
964 dentry->full_path_utf8);
965 return WIMLIB_ERR_INVALID_DENTRY;
968 /* Make sure root dentry is unnamed */
969 if (dentry_is_root(dentry)) {
970 if (dentry->file_name_len) {
971 ERROR("The root dentry is named `%s', but it must "
972 "be unnamed", dentry->file_name_utf8);
973 return WIMLIB_ERR_INVALID_DENTRY;
978 /* Check timestamps */
979 if (inode->last_access_time < inode->creation_time ||
980 inode->last_write_time < inode->creation_time) {
981 WARNING("Dentry `%s' was created after it was last accessed or "
982 "written to", dentry->full_path_utf8);
991 /* Returns the alternate data stream entry belonging to @inode that has the
992 * stream name @stream_name. */
993 struct ads_entry *inode_get_ads_entry(struct inode *inode,
994 const char *stream_name,
997 size_t stream_name_len;
1000 if (inode->num_ads) {
1002 stream_name_len = strlen(stream_name);
1004 if (ads_entry_has_name(&inode->ads_entries[i],
1005 stream_name, stream_name_len))
1009 return &inode->ads_entries[i];
1011 } while (++i != inode->num_ads);
1017 #if defined(WITH_FUSE) || defined(WITH_NTFS_3G)
1019 * Add an alternate stream entry to an inode and return a pointer to it, or NULL
1020 * if memory could not be allocated.
1022 struct ads_entry *inode_add_ads(struct inode *inode, const char *stream_name)
1025 struct ads_entry *ads_entries;
1026 struct ads_entry *new_entry;
1028 DEBUG("Add alternate data stream \"%s\"", stream_name);
1030 if (inode->num_ads >= 0xfffe) {
1031 ERROR("Too many alternate data streams in one inode!");
1034 num_ads = inode->num_ads + 1;
1035 ads_entries = REALLOC(inode->ads_entries,
1036 num_ads * sizeof(inode->ads_entries[0]));
1038 ERROR("Failed to allocate memory for new alternate data stream");
1041 inode->ads_entries = ads_entries;
1043 new_entry = &inode->ads_entries[num_ads - 1];
1044 if (init_ads_entry(new_entry, stream_name) != 0)
1047 new_entry->stream_id = inode->next_stream_id++;
1049 inode->num_ads = num_ads;
1055 /* Remove an alternate data stream from the inode */
1056 void inode_remove_ads(struct inode *inode, u16 idx,
1057 struct lookup_table *lookup_table)
1059 struct ads_entry *ads_entry;
1060 struct lookup_table_entry *lte;
1062 wimlib_assert(idx < inode->num_ads);
1063 wimlib_assert(inode->resolved);
1065 ads_entry = &inode->ads_entries[idx];
1067 DEBUG("Remove alternate data stream \"%s\"", ads_entry->stream_name_utf8);
1069 lte = ads_entry->lte;
1071 lte_decrement_refcnt(lte, lookup_table);
1073 destroy_ads_entry(ads_entry);
1075 memcpy(&inode->ads_entries[idx],
1076 &inode->ads_entries[idx + 1],
1077 (inode->num_ads - idx - 1) * sizeof(inode->ads_entries[0]));
1085 * Reads the alternate data stream entries for a dentry.
1087 * @p: Pointer to buffer that starts with the first alternate stream entry.
1089 * @inode: Inode to load the alternate data streams into.
1090 * @inode->num_ads must have been set to the number of
1091 * alternate data streams that are expected.
1093 * @remaining_size: Number of bytes of data remaining in the buffer pointed
1096 * The format of the on-disk alternate stream entries is as follows:
1098 * struct ads_entry_on_disk {
1099 * u64 length; // Length of the entry, in bytes. This includes
1100 * all fields (including the stream name and
1101 * null terminator if present, AND the padding!).
1102 * u64 reserved; // Seems to be unused
1103 * u8 hash[20]; // SHA1 message digest of the uncompressed stream
1104 * u16 stream_name_len; // Length of the stream name, in bytes
1105 * char stream_name[]; // Stream name in UTF-16LE, @stream_name_len bytes long,
1106 * not including null terminator
1107 * u16 zero; // UTF-16 null terminator for the stream name, NOT
1108 * included in @stream_name_len. Based on what
1109 * I've observed from filenames in dentries,
1110 * this field should not exist when
1111 * (@stream_name_len == 0), but you can't
1112 * actually tell because of the padding anyway
1113 * (provided that the padding is zeroed, which
1114 * it always seems to be).
1115 * char padding[]; // Padding to make the size a multiple of 8 bytes.
1118 * In addition, the entries are 8-byte aligned.
1120 * Return 0 on success or nonzero on failure. On success, inode->ads_entries
1121 * is set to an array of `struct ads_entry's of length inode->num_ads. On
1122 * failure, @inode is not modified.
1124 static int read_ads_entries(const u8 *p, struct inode *inode,
1128 struct ads_entry *ads_entries;
1131 num_ads = inode->num_ads;
1132 ads_entries = CALLOC(num_ads, sizeof(inode->ads_entries[0]));
1134 ERROR("Could not allocate memory for %"PRIu16" "
1135 "alternate data stream entries", num_ads);
1136 return WIMLIB_ERR_NOMEM;
1139 for (u16 i = 0; i < num_ads; i++) {
1140 struct ads_entry *cur_entry;
1142 u64 length_no_padding;
1145 const u8 *p_save = p;
1147 cur_entry = &ads_entries[i];
1150 ads_entries[i].stream_id = i + 1;
1153 /* Read the base stream entry, excluding the stream name. */
1154 if (remaining_size < WIM_ADS_ENTRY_DISK_SIZE) {
1155 ERROR("Stream entries go past end of metadata resource");
1156 ERROR("(remaining_size = %"PRIu64")", remaining_size);
1157 ret = WIMLIB_ERR_INVALID_DENTRY;
1158 goto out_free_ads_entries;
1161 p = get_u64(p, &length);
1162 p += 8; /* Skip the reserved field */
1163 p = get_bytes(p, SHA1_HASH_SIZE, (u8*)cur_entry->hash);
1164 p = get_u16(p, &cur_entry->stream_name_len);
1166 cur_entry->stream_name = NULL;
1167 cur_entry->stream_name_utf8 = NULL;
1169 /* Length including neither the null terminator nor the padding
1171 length_no_padding = WIM_ADS_ENTRY_DISK_SIZE +
1172 cur_entry->stream_name_len;
1174 /* Length including the null terminator and the padding */
1175 total_length = ((length_no_padding + 2) + 7) & ~7;
1177 wimlib_assert(total_length == ads_entry_total_length(cur_entry));
1179 if (remaining_size < length_no_padding) {
1180 ERROR("Stream entries go past end of metadata resource");
1181 ERROR("(remaining_size = %"PRIu64" bytes, "
1182 "length_no_padding = %"PRIu64" bytes)",
1183 remaining_size, length_no_padding);
1184 ret = WIMLIB_ERR_INVALID_DENTRY;
1185 goto out_free_ads_entries;
1188 /* The @length field in the on-disk ADS entry is expected to be
1189 * equal to @total_length, which includes all of the entry and
1190 * the padding that follows it to align the next ADS entry to an
1191 * 8-byte boundary. However, to be safe, we'll accept the
1192 * length field as long as it's not less than the un-padded
1193 * total length and not more than the padded total length. */
1194 if (length < length_no_padding || length > total_length) {
1195 ERROR("Stream entry has unexpected length "
1196 "field (length field = %"PRIu64", "
1197 "unpadded total length = %"PRIu64", "
1198 "padded total length = %"PRIu64")",
1199 length, length_no_padding, total_length);
1200 ret = WIMLIB_ERR_INVALID_DENTRY;
1201 goto out_free_ads_entries;
1204 if (cur_entry->stream_name_len) {
1205 cur_entry->stream_name = MALLOC(cur_entry->stream_name_len);
1206 if (!cur_entry->stream_name) {
1207 ret = WIMLIB_ERR_NOMEM;
1208 goto out_free_ads_entries;
1210 get_bytes(p, cur_entry->stream_name_len,
1211 (u8*)cur_entry->stream_name);
1212 cur_entry->stream_name_utf8 = utf16_to_utf8(cur_entry->stream_name,
1213 cur_entry->stream_name_len,
1215 cur_entry->stream_name_utf8_len = utf8_len;
1217 if (!cur_entry->stream_name_utf8) {
1218 ret = WIMLIB_ERR_NOMEM;
1219 goto out_free_ads_entries;
1222 /* It's expected that the size of every ADS entry is a multiple
1223 * of 8. However, to be safe, I'm allowing the possibility of
1224 * an ADS entry at the very end of the metadata resource ending
1225 * un-aligned. So although we still need to increment the input
1226 * pointer by @total_length to reach the next ADS entry, it's
1227 * possible that less than @total_length is actually remaining
1228 * in the metadata resource. We should set the remaining size to
1229 * 0 bytes if this happens. */
1230 p = p_save + total_length;
1231 if (remaining_size < total_length)
1234 remaining_size -= total_length;
1236 inode->ads_entries = ads_entries;
1238 inode->next_stream_id = inode->num_ads + 1;
1241 out_free_ads_entries:
1242 for (u16 i = 0; i < num_ads; i++)
1243 destroy_ads_entry(&ads_entries[i]);
1249 * Reads a directory entry, including all alternate data stream entries that
1250 * follow it, from the WIM image's metadata resource.
1252 * @metadata_resource: Buffer containing the uncompressed metadata resource.
1253 * @metadata_resource_len: Length of the metadata resource.
1254 * @offset: Offset of this directory entry in the metadata resource.
1255 * @dentry: A `struct dentry' that will be filled in by this function.
1257 * Return 0 on success or nonzero on failure. On failure, @dentry have been
1258 * modified, bu it will be left with no pointers to any allocated buffers.
1259 * On success, the dentry->length field must be examined. If zero, this was a
1260 * special "end of directory" dentry and not a real dentry. If nonzero, this
1261 * was a real dentry.
1263 int read_dentry(const u8 metadata_resource[], u64 metadata_resource_len,
1264 u64 offset, struct dentry *dentry)
1267 u64 calculated_size;
1268 char *file_name = NULL;
1269 char *file_name_utf8 = NULL;
1270 char *short_name = NULL;
1273 size_t file_name_utf8_len = 0;
1275 struct inode *inode = NULL;
1277 dentry_common_init(dentry);
1279 /*Make sure the dentry really fits into the metadata resource.*/
1280 if (offset + 8 > metadata_resource_len || offset + 8 < offset) {
1281 ERROR("Directory entry starting at %"PRIu64" ends past the "
1282 "end of the metadata resource (size %"PRIu64")",
1283 offset, metadata_resource_len);
1284 return WIMLIB_ERR_INVALID_DENTRY;
1287 /* Before reading the whole dentry, we need to read just the length.
1288 * This is because a dentry of length 8 (that is, just the length field)
1289 * terminates the list of sibling directory entries. */
1291 p = get_u64(&metadata_resource[offset], &dentry->length);
1293 /* A zero length field (really a length of 8, since that's how big the
1294 * directory entry is...) indicates that this is the end of directory
1295 * dentry. We do not read it into memory as an actual dentry, so just
1296 * return successfully in that case. */
1297 if (dentry->length == 0)
1300 /* If the dentry does not overflow the metadata resource buffer and is
1301 * not too short, read the rest of it (excluding the alternate data
1302 * streams, but including the file name and short name variable-length
1303 * fields) into memory. */
1304 if (offset + dentry->length >= metadata_resource_len
1305 || offset + dentry->length < offset)
1307 ERROR("Directory entry at offset %"PRIu64" and with size "
1308 "%"PRIu64" ends past the end of the metadata resource "
1310 offset, dentry->length, metadata_resource_len);
1311 return WIMLIB_ERR_INVALID_DENTRY;
1314 if (dentry->length < WIM_DENTRY_DISK_SIZE) {
1315 ERROR("Directory entry has invalid length of %"PRIu64" bytes",
1317 return WIMLIB_ERR_INVALID_DENTRY;
1320 inode = new_timeless_inode();
1322 return WIMLIB_ERR_NOMEM;
1324 p = get_u32(p, &inode->attributes);
1325 p = get_u32(p, (u32*)&inode->security_id);
1326 p = get_u64(p, &dentry->subdir_offset);
1328 /* 2 unused fields */
1329 p += 2 * sizeof(u64);
1330 /*p = get_u64(p, &dentry->unused1);*/
1331 /*p = get_u64(p, &dentry->unused2);*/
1333 p = get_u64(p, &inode->creation_time);
1334 p = get_u64(p, &inode->last_access_time);
1335 p = get_u64(p, &inode->last_write_time);
1337 p = get_bytes(p, SHA1_HASH_SIZE, inode->hash);
1340 * I don't know what's going on here. It seems like M$ screwed up the
1341 * reparse points, then put the fields in the same place and didn't
1342 * document it. The WIM_HDR_FLAG_RP_FIX flag in the WIM header might
1343 * have something to do with this, but it's not documented.
1345 if (inode->attributes & FILE_ATTRIBUTE_REPARSE_POINT) {
1348 p = get_u32(p, &inode->reparse_tag);
1351 p = get_u32(p, &inode->reparse_tag);
1352 p = get_u64(p, &inode->ino);
1355 /* By the way, the reparse_reserved field does not actually exist (at
1356 * least when the file is not a reparse point) */
1358 p = get_u16(p, &inode->num_ads);
1360 p = get_u16(p, &short_name_len);
1361 p = get_u16(p, &file_name_len);
1363 /* We now know the length of the file name and short name. Make sure
1364 * the length of the dentry is large enough to actually hold them.
1366 * The calculated length here is unaligned to allow for the possibility
1367 * that the dentry->length names an unaligned length, although this
1368 * would be unexpected. */
1369 calculated_size = __dentry_correct_length_unaligned(file_name_len,
1372 if (dentry->length < calculated_size) {
1373 ERROR("Unexpected end of directory entry! (Expected "
1374 "at least %"PRIu64" bytes, got %"PRIu64" bytes. "
1375 "short_name_len = %hu, file_name_len = %hu)",
1376 calculated_size, dentry->length,
1377 short_name_len, file_name_len);
1378 ret = WIMLIB_ERR_INVALID_DENTRY;
1379 goto out_free_inode;
1382 /* Read the filename if present. Note: if the filename is empty, there
1383 * is no null terminator following it. */
1384 if (file_name_len) {
1385 file_name = MALLOC(file_name_len);
1387 ERROR("Failed to allocate %hu bytes for dentry file name",
1389 ret = WIMLIB_ERR_NOMEM;
1390 goto out_free_inode;
1392 p = get_bytes(p, file_name_len, file_name);
1394 /* Convert filename to UTF-8. */
1395 file_name_utf8 = utf16_to_utf8(file_name, file_name_len,
1396 &file_name_utf8_len);
1398 if (!file_name_utf8) {
1399 ERROR("Failed to allocate memory to convert UTF-16 "
1400 "filename (%hu bytes) to UTF-8", file_name_len);
1401 ret = WIMLIB_ERR_NOMEM;
1402 goto out_free_file_name;
1405 WARNING("Expected two zero bytes following the file name "
1406 "`%s', but found non-zero bytes", file_name_utf8);
1410 /* Align the calculated size */
1411 calculated_size = (calculated_size + 7) & ~7;
1413 if (dentry->length > calculated_size) {
1414 /* Weird; the dentry says it's longer than it should be. Note
1415 * that the length field does NOT include the size of the
1416 * alternate stream entries. */
1418 /* Strangely, some directory entries inexplicably have a little
1419 * over 70 bytes of extra data. The exact amount of data seems
1420 * to be 72 bytes, but it is aligned on the next 8-byte
1421 * boundary. It does NOT seem to be alternate data stream
1422 * entries. Here's an example of the aligned data:
1424 * 01000000 40000000 6c786bba c58ede11 b0bb0026 1870892a b6adb76f
1425 * e63a3e46 8fca8653 0d2effa1 6c786bba c58ede11 b0bb0026 1870892a
1426 * 00000000 00000000 00000000 00000000
1428 * Here's one interpretation of how the data is laid out.
1431 * u32 field1; (always 0x00000001)
1432 * u32 field2; (always 0x40000000)
1433 * u8 data[48]; (???)
1434 * u64 reserved1; (always 0)
1435 * u64 reserved2; (always 0)
1437 DEBUG("Dentry for file or directory `%s' has %zu extra "
1439 file_name_utf8, dentry->length - calculated_size);
1442 /* Read the short filename if present. Note: if there is no short
1443 * filename, there is no null terminator following it. */
1444 if (short_name_len) {
1445 short_name = MALLOC(short_name_len);
1447 ERROR("Failed to allocate %hu bytes for short filename",
1449 ret = WIMLIB_ERR_NOMEM;
1450 goto out_free_file_name_utf8;
1453 p = get_bytes(p, short_name_len, short_name);
1455 WARNING("Expected two zero bytes following the short name of "
1456 "`%s', but found non-zero bytes", file_name_utf8);
1461 * Read the alternate data streams, if present. dentry->num_ads tells
1462 * us how many they are, and they will directly follow the dentry
1465 * Note that each alternate data stream entry begins on an 8-byte
1466 * aligned boundary, and the alternate data stream entries are NOT
1467 * included in the dentry->length field for some reason.
1469 if (inode->num_ads != 0) {
1471 /* Trying different lengths is just a hack to make sure we have
1472 * a chance of reading the ADS entries correctly despite the
1473 * poor documentation. */
1475 if (calculated_size != dentry->length) {
1476 WARNING("Trying calculated dentry length (%"PRIu64") "
1477 "instead of dentry->length field (%"PRIu64") "
1478 "to read ADS entries",
1479 calculated_size, dentry->length);
1481 u64 lengths_to_try[3] = {calculated_size,
1482 (dentry->length + 7) & ~7,
1484 ret = WIMLIB_ERR_INVALID_DENTRY;
1485 for (size_t i = 0; i < ARRAY_LEN(lengths_to_try); i++) {
1486 if (lengths_to_try[i] > metadata_resource_len - offset)
1488 ret = read_ads_entries(&metadata_resource[offset + lengths_to_try[i]],
1490 metadata_resource_len - offset - lengths_to_try[i]);
1494 ERROR("Failed to read alternate data stream "
1495 "entries of `%s'", dentry->file_name_utf8);
1496 goto out_free_short_name;
1500 /* We've read all the data for this dentry. Set the names and their
1501 * lengths, and we've done. */
1502 dentry->d_inode = inode;
1503 dentry->file_name = file_name;
1504 dentry->file_name_utf8 = file_name_utf8;
1505 dentry->short_name = short_name;
1506 dentry->file_name_len = file_name_len;
1507 dentry->file_name_utf8_len = file_name_utf8_len;
1508 dentry->short_name_len = short_name_len;
1510 out_free_short_name:
1512 out_free_file_name_utf8:
1513 FREE(file_name_utf8);
1521 /* Reads the children of a dentry, and all their children, ..., etc. from the
1522 * metadata resource and into the dentry tree.
1524 * @metadata_resource: An array that contains the uncompressed metadata
1525 * resource for the WIM file.
1527 * @metadata_resource_len: The length of the uncompressed metadata resource, in
1530 * @dentry: A pointer to a `struct dentry' that is the root of the directory
1531 * tree and has already been read from the metadata resource. It
1532 * does not need to be the real root because this procedure is
1533 * called recursively.
1535 * @return: Zero on success, nonzero on failure.
1537 int read_dentry_tree(const u8 metadata_resource[], u64 metadata_resource_len,
1538 struct dentry *dentry)
1540 u64 cur_offset = dentry->subdir_offset;
1541 struct dentry *prev_child = NULL;
1542 struct dentry *first_child = NULL;
1543 struct dentry *child;
1544 struct dentry cur_child;
1548 * If @dentry has no child dentries, nothing more needs to be done for
1549 * this branch. This is the case for regular files, symbolic links, and
1550 * *possibly* empty directories (although an empty directory may also
1551 * have one child dentry that is the special end-of-directory dentry)
1553 if (cur_offset == 0)
1556 /* Find and read all the children of @dentry. */
1559 /* Read next child of @dentry into @cur_child. */
1560 ret = read_dentry(metadata_resource, metadata_resource_len,
1561 cur_offset, &cur_child);
1565 /* Check for end of directory. */
1566 if (cur_child.length == 0)
1569 /* Not end of directory. Allocate this child permanently and
1570 * link it to the parent and previous child. */
1571 child = MALLOC(sizeof(struct dentry));
1573 ERROR("Failed to allocate %zu bytes for new dentry",
1574 sizeof(struct dentry));
1575 ret = WIMLIB_ERR_NOMEM;
1578 memcpy(child, &cur_child, sizeof(struct dentry));
1581 prev_child->next = child;
1582 child->prev = prev_child;
1584 first_child = child;
1587 child->parent = dentry;
1589 inode_add_dentry(child, child->d_inode);
1591 /* If there are children of this child, call this procedure
1593 if (child->subdir_offset != 0) {
1594 ret = read_dentry_tree(metadata_resource,
1595 metadata_resource_len, child);
1600 /* Advance to the offset of the next child. Note: We need to
1601 * advance by the TOTAL length of the dentry, not by the length
1602 * child->length, which although it does take into account the
1603 * padding, it DOES NOT take into account alternate stream
1605 cur_offset += dentry_total_length(child);
1608 /* Link last child to first one, and set parent's children pointer to
1609 * the first child. */
1611 prev_child->next = first_child;
1612 first_child->prev = prev_child;
1614 dentry->d_inode->children = first_child;
1619 * Writes a WIM dentry to an output buffer.
1621 * @dentry: The dentry structure.
1622 * @p: The memory location to write the data to.
1623 * @return: Pointer to the byte after the last byte we wrote as part of the
1626 static u8 *write_dentry(const struct dentry *dentry, u8 *p)
1630 const struct inode *inode = dentry->d_inode;
1632 /* We calculate the correct length of the dentry ourselves because the
1633 * dentry->length field may been set to an unexpected value from when we
1634 * read the dentry in (for example, there may have been unknown data
1635 * appended to the end of the dentry...) */
1636 u64 length = dentry_correct_length(dentry);
1638 p = put_u64(p, length);
1639 p = put_u32(p, inode->attributes);
1640 p = put_u32(p, inode->security_id);
1641 p = put_u64(p, dentry->subdir_offset);
1642 p = put_u64(p, 0); /* unused1 */
1643 p = put_u64(p, 0); /* unused2 */
1644 p = put_u64(p, inode->creation_time);
1645 p = put_u64(p, inode->last_access_time);
1646 p = put_u64(p, inode->last_write_time);
1647 hash = inode_stream_hash(inode, 0);
1648 p = put_bytes(p, SHA1_HASH_SIZE, hash);
1649 if (inode->attributes & FILE_ATTRIBUTE_REPARSE_POINT) {
1650 p = put_zeroes(p, 4);
1651 p = put_u32(p, inode->reparse_tag);
1652 p = put_zeroes(p, 4);
1656 if (inode->link_count == 1)
1659 link_group_id = inode->ino;
1660 p = put_u64(p, link_group_id);
1662 p = put_u16(p, inode->num_ads);
1663 p = put_u16(p, dentry->short_name_len);
1664 p = put_u16(p, dentry->file_name_len);
1665 if (dentry->file_name_len) {
1666 p = put_bytes(p, dentry->file_name_len, (u8*)dentry->file_name);
1667 p = put_u16(p, 0); /* filename padding, 2 bytes. */
1669 if (dentry->short_name) {
1670 p = put_bytes(p, dentry->short_name_len, (u8*)dentry->short_name);
1671 p = put_u16(p, 0); /* short name padding, 2 bytes */
1674 /* Align to 8-byte boundary */
1675 wimlib_assert(length >= (p - orig_p) && length - (p - orig_p) <= 7);
1676 p = put_zeroes(p, length - (p - orig_p));
1678 /* Write the alternate data streams, if there are any. Please see
1679 * read_ads_entries() for comments about the format of the on-disk
1680 * alternate data stream entries. */
1681 for (u16 i = 0; i < inode->num_ads; i++) {
1682 p = put_u64(p, ads_entry_total_length(&inode->ads_entries[i]));
1683 p = put_u64(p, 0); /* Unused */
1684 hash = inode_stream_hash(inode, i + 1);
1685 p = put_bytes(p, SHA1_HASH_SIZE, hash);
1686 p = put_u16(p, inode->ads_entries[i].stream_name_len);
1687 if (inode->ads_entries[i].stream_name_len) {
1688 p = put_bytes(p, inode->ads_entries[i].stream_name_len,
1689 (u8*)inode->ads_entries[i].stream_name);
1692 p = put_zeroes(p, (8 - (p - orig_p) % 8) % 8);
1694 wimlib_assert(p - orig_p == __dentry_total_length(dentry, length));
1698 /* Recursive function that writes a dentry tree rooted at @parent, not including
1699 * @parent itself, which has already been written. */
1700 static u8 *write_dentry_tree_recursive(const struct dentry *parent, u8 *p)
1702 const struct dentry *child, *children;
1704 /* Nothing to do if this dentry has no children. */
1705 if (parent->subdir_offset == 0)
1708 /* Write child dentries and end-of-directory entry.
1710 * Note: we need to write all of this dentry's children before
1711 * recursively writing the directory trees rooted at each of the child
1712 * dentries, since the on-disk dentries for a dentry's children are
1713 * always located at consecutive positions in the metadata resource! */
1714 children = parent->d_inode->children;
1718 p = write_dentry(child, p);
1719 child = child->next;
1720 } while (child != children);
1723 /* write end of directory entry */
1726 /* Recurse on children. */
1729 p = write_dentry_tree_recursive(child, p);
1730 child = child->next;
1731 } while (child != children);
1736 /* Writes a directory tree to the metadata resource.
1738 * @root: Root of the dentry tree.
1739 * @p: Pointer to a buffer with enough space for the dentry tree.
1741 * Returns pointer to the byte after the last byte we wrote.
1743 u8 *write_dentry_tree(const struct dentry *root, u8 *p)
1745 DEBUG("Writing dentry tree.");
1746 wimlib_assert(dentry_is_root(root));
1748 /* If we're the root dentry, we have no parent that already
1749 * wrote us, so we need to write ourselves. */
1750 p = write_dentry(root, p);
1752 /* Write end of directory entry after the root dentry just to be safe;
1753 * however the root dentry obviously cannot have any siblings. */
1756 /* Recursively write the rest of the dentry tree. */
1757 return write_dentry_tree_recursive(root, p);