* resource with its own security data and dentry tree. Dentries in different
* images may share file resources by referring to the same lookup table
* entries.
- *
- * Copyright (C) 2010 Carl Thijssen
+ */
+
+/*
* Copyright (C) 2012 Eric Biggers
*
- * wimlib - Library for working with WIM files
+ * This file is part of wimlib, a library for working with WIM files.
*
- * This library 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 2.1 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 library 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 Lesser General Public License along
- * with this library; if not, write to the Free Software Foundation, Inc., 59
- * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * You should have received a copy of the GNU General Public License along with
+ * wimlib; if not, see http://www.gnu.org/licenses/.
*/
-#include "wimlib_internal.h"
+#include <errno.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <unistd.h>
+
#include "dentry.h"
#include "io.h"
-#include "timestamp.h"
#include "lookup_table.h"
-#include <unistd.h>
-#include <sys/stat.h>
+#include "sha1.h"
+#include "timestamp.h"
+#include "wimlib_internal.h"
+
+/*
+ * Returns true if @dentry has the UTF-8 file name @name that has length
+ * @name_len.
+ */
+static bool dentry_has_name(const struct dentry *dentry, const char *name,
+ size_t name_len)
+{
+ if (dentry->file_name_utf8_len != name_len)
+ return false;
+ return memcmp(dentry->file_name_utf8, name, name_len) == 0;
+}
+static u64 __dentry_correct_length_unaligned(u16 file_name_len,
+ u16 short_name_len)
+{
+ u64 length = WIM_DENTRY_DISK_SIZE;
+ if (file_name_len)
+ length += file_name_len + 2;
+ if (short_name_len)
+ length += short_name_len + 2;
+ return length;
+}
+
+static u64 dentry_correct_length_unaligned(const struct dentry *dentry)
+{
+ return __dentry_correct_length_unaligned(dentry->file_name_len,
+ dentry->short_name_len);
+}
+
+/* Return the "correct" value to write in the length field of the dentry, based
+ * on the file name length and short name length */
+static u64 dentry_correct_length(const struct dentry *dentry)
+{
+ return (dentry_correct_length_unaligned(dentry) + 7) & ~7;
+}
+
+static u64 __dentry_total_length(const struct dentry *dentry, u64 length)
+{
+ for (u16 i = 0; i < dentry->num_ads; i++)
+ length += ads_entry_total_length(&dentry->ads_entries[i]);
+ return (length + 7) & ~7;
+}
+
+u64 dentry_correct_total_length(const struct dentry *dentry)
+{
+ return __dentry_total_length(dentry,
+ dentry_correct_length_unaligned(dentry));
+}
+
+/* Real length of a dentry, including the alternate data stream entries, which
+ * are not included in the dentry->length field... */
+u64 dentry_total_length(const struct dentry *dentry)
+{
+ return __dentry_total_length(dentry, dentry->length);
+}
/* Transfers file attributes from a `stat' buffer to a struct dentry. */
void stbuf_to_dentry(const struct stat *stbuf, struct dentry *dentry)
{
- if (S_ISDIR(stbuf->st_mode))
- dentry->attributes = WIM_FILE_ATTRIBUTE_DIRECTORY;
+ if (S_ISLNK(stbuf->st_mode)) {
+ dentry->attributes = FILE_ATTRIBUTE_REPARSE_POINT;
+ dentry->reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK;
+ } else if (S_ISDIR(stbuf->st_mode)) {
+ dentry->attributes = FILE_ATTRIBUTE_DIRECTORY;
+ } else {
+ dentry->attributes = FILE_ATTRIBUTE_NORMAL;
+ }
+ if (sizeof(ino_t) >= 8)
+ dentry->link_group_id = (u64)stbuf->st_ino;
else
- dentry->attributes = WIM_FILE_ATTRIBUTE_NORMAL;
+ dentry->link_group_id = (u64)stbuf->st_ino |
+ ((u64)stbuf->st_dev << (sizeof(ino_t) * 8));
+ /* Set timestamps */
+ dentry->creation_time = timespec_to_wim_timestamp(&stbuf->st_mtim);
+ dentry->last_write_time = timespec_to_wim_timestamp(&stbuf->st_mtim);
+ dentry->last_access_time = timespec_to_wim_timestamp(&stbuf->st_atim);
}
-/* Transfers file attributes from a struct dentry to a `stat' buffer. */
-void dentry_to_stbuf(const struct dentry *dentry, struct stat *stbuf,
- const struct lookup_table *table)
+
+/* Sets all the timestamp fields of the dentry to the current time. */
+void dentry_update_all_timestamps(struct dentry *dentry)
{
- struct lookup_table_entry *lte;
+ u64 now = get_wim_timestamp();
+ dentry->creation_time = now;
+ dentry->last_access_time = now;
+ dentry->last_write_time = now;
+}
- if (dentry_is_directory(dentry))
- stbuf->st_mode = S_IFDIR | 0755;
- else
- stbuf->st_mode = S_IFREG | 0644;
+/* Returns the alternate data stream entry belonging to @dentry that has the
+ * stream name @stream_name. */
+struct ads_entry *dentry_get_ads_entry(struct dentry *dentry,
+ const char *stream_name)
+{
+ size_t stream_name_len;
+ if (!stream_name)
+ return NULL;
+ if (dentry->num_ads) {
+ u16 i = 0;
+ stream_name_len = strlen(stream_name);
+ do {
+ if (ads_entry_has_name(&dentry->ads_entries[i],
+ stream_name, stream_name_len))
+ return &dentry->ads_entries[i];
+ } while (++i != dentry->num_ads);
+ }
+ return NULL;
+}
- if (table)
- lte = lookup_resource(table, dentry->hash);
- else
- lte = NULL;
+static void ads_entry_init(struct ads_entry *ads_entry)
+{
+ memset(ads_entry, 0, sizeof(struct ads_entry));
+ INIT_LIST_HEAD(&ads_entry->lte_group_list.list);
+ ads_entry->lte_group_list.type = STREAM_TYPE_ADS;
+}
- if (lte) {
- stbuf->st_nlink = lte->refcnt;
- stbuf->st_size = lte->resource_entry.original_size;
- } else {
- stbuf->st_nlink = 1;
- stbuf->st_size = 0;
+/*
+ * Add an alternate stream entry to a dentry and return a pointer to it, or NULL
+ * if memory could not be allocated.
+ */
+struct ads_entry *dentry_add_ads(struct dentry *dentry, const char *stream_name)
+{
+ u16 num_ads;
+ struct ads_entry *ads_entries;
+ struct ads_entry *new_entry;
+
+ DEBUG("Add alternate data stream %s:%s",
+ dentry->file_name_utf8, stream_name);
+
+ if (dentry->num_ads == 0xffff) {
+ ERROR("Too many alternate data streams in one dentry!");
+ return NULL;
+ }
+ num_ads = dentry->num_ads + 1;
+ ads_entries = REALLOC(dentry->ads_entries,
+ num_ads * sizeof(dentry->ads_entries[0]));
+ if (!ads_entries) {
+ ERROR("Failed to allocate memory for new alternate data stream");
+ return NULL;
+ }
+ wimlib_assert(ads_entries == dentry->ads_entries ||
+ ads_entries < dentry->ads_entries ||
+ ads_entries > dentry->ads_entries + dentry->num_ads);
+ if (ads_entries != dentry->ads_entries) {
+ /* We moved the ADS entries. Adjust the stream lists. */
+ for (u16 i = 0; i < dentry->num_ads; i++) {
+ struct list_head *cur = &ads_entries[i].lte_group_list.list;
+ struct list_head *prev = cur->prev;
+ struct list_head *next = cur->next;
+ if ((u8*)prev >= (u8*)dentry->ads_entries
+ && (u8*)prev < (u8*)(dentry->ads_entries + dentry->num_ads)) {
+ /* Previous entry was located in the same ads_entries
+ * array! Adjust our own prev pointer. */
+ u16 idx = (struct ads_entry*)prev -
+ (struct ads_entry*)&dentry->ads_entries[0].lte_group_list.list;
+ cur->prev = &ads_entries[idx].lte_group_list.list;
+ } else {
+ /* Previous entry is located in a different ads_entries
+ * array. Adjust its next pointer. */
+ prev->next = cur;
+ }
+ next = cur->next;
+ if ((u8*)next >= (u8*)dentry->ads_entries
+ && (u8*)next < (u8*)(dentry->ads_entries + dentry->num_ads)) {
+ /* Next entry was located in the same ads_entries array!
+ * Adjust our own next pointer. */
+ u16 idx = (struct ads_entry*)next -
+ (struct ads_entry*)&dentry->ads_entries[0].lte_group_list.list;
+ cur->next = &ads_entries[idx].lte_group_list.list;
+ } else {
+ /* Next entry is located in a different ads_entries
+ * array. Adjust its prev pointer. */
+ next->prev = cur;
+ }
+ }
}
- stbuf->st_uid = getuid();
- stbuf->st_gid = getgid();
- stbuf->st_atime = ms_timestamp_to_unix(dentry->last_access_time);
- stbuf->st_mtime = ms_timestamp_to_unix(dentry->last_write_time);
- stbuf->st_ctime = ms_timestamp_to_unix(dentry->creation_time);
- stbuf->st_blocks = (stbuf->st_size + 511) / 512;
+
+ new_entry = &ads_entries[num_ads - 1];
+ ads_entry_init(new_entry);
+ if (change_ads_name(new_entry, stream_name) != 0)
+ return NULL;
+ dentry->ads_entries = ads_entries;
+ dentry->num_ads = num_ads;
+ return new_entry;
}
-/* Makes all timestamp fields for the dentry be the current time. */
-void dentry_update_all_timestamps(struct dentry *dentry)
+/* Remove an alternate data stream from a dentry.
+ *
+ * The corresponding lookup table entry for the stream is NOT changed.
+ *
+ * @dentry: The dentry
+ * @ads_entry: The alternate data stream entry (it MUST be one of the
+ * ads_entry's in the array dentry->ads_entries).
+ */
+void dentry_remove_ads(struct dentry *dentry, struct ads_entry *ads_entry)
{
- u64 now = get_timestamp();
- dentry->creation_time = now;
- dentry->last_access_time = now;
- dentry->last_write_time = now;
+ u16 idx;
+ u16 following;
+
+ wimlib_assert(dentry->num_ads);
+ idx = ads_entry - dentry->ads_entries;
+ wimlib_assert(idx < dentry->num_ads);
+ following = dentry->num_ads - idx - 1;
+
+ destroy_ads_entry(ads_entry);
+ memcpy(ads_entry, ads_entry + 1, following * sizeof(struct ads_entry));
+
+ /* We moved the ADS entries. Adjust the stream lists. */
+ for (u16 i = 0; i < following; i++) {
+ struct list_head *cur = &ads_entry[i].lte_group_list.list;
+ cur->prev->next = cur;
+ cur->next->prev = cur;
+ }
+
+ dentry->num_ads--;
}
/*
*/
int calculate_dentry_full_path(struct dentry *dentry, void *ignore)
{
- int parent_len;
- int len;
- char *parent_full_path;
char *full_path;
-
- FREE(dentry->full_path_utf8);
-
+ u32 full_path_len;
if (dentry_is_root(dentry)) {
- dentry->full_path_utf8 = MALLOC(2);
- if (!dentry->full_path_utf8) {
- ERROR("Out of memory!\n");
- return WIMLIB_ERR_NOMEM;
- }
-
- dentry->full_path_utf8[0] = '/';
- dentry->full_path_utf8[1] = '\0';
- dentry->full_path_utf8_len = 1;
- return 0;
- }
-
- if (dentry_is_root(dentry->parent)) {
- parent_len = 0;
- parent_full_path = "";
+ full_path = MALLOC(2);
+ if (!full_path)
+ goto oom;
+ full_path[0] = '/';
+ full_path[1] = '\0';
+ full_path_len = 1;
} else {
- parent_len = dentry->parent->full_path_utf8_len;
- parent_full_path = dentry->parent->full_path_utf8;
- }
+ char *parent_full_path;
+ u32 parent_full_path_len;
+ const struct dentry *parent = dentry->parent;
- len = parent_len + 1 + dentry->file_name_utf8_len;
- full_path = MALLOC(len + 1);
- if (!full_path) {
- ERROR("Out of memory!\n");
- return WIMLIB_ERR_NOMEM;
- }
+ if (dentry_is_root(parent)) {
+ parent_full_path = "";
+ parent_full_path_len = 0;
+ } else {
+ parent_full_path = parent->full_path_utf8;
+ parent_full_path_len = parent->full_path_utf8_len;
+ }
- memcpy(full_path, parent_full_path, parent_len);
- full_path[parent_len] = '/';
- memcpy(full_path + parent_len + 1, dentry->file_name_utf8,
- dentry->file_name_utf8_len);
- full_path[len] = '\0';
+ full_path_len = parent_full_path_len + 1 +
+ dentry->file_name_utf8_len;
+ full_path = MALLOC(full_path_len + 1);
+ if (!full_path)
+ goto oom;
+
+ memcpy(full_path, parent_full_path, parent_full_path_len);
+ full_path[parent_full_path_len] = '/';
+ memcpy(full_path + parent_full_path_len + 1,
+ dentry->file_name_utf8,
+ dentry->file_name_utf8_len);
+ full_path[full_path_len] = '\0';
+ }
+ FREE(dentry->full_path_utf8);
dentry->full_path_utf8 = full_path;
- dentry->full_path_utf8_len = len;
+ dentry->full_path_utf8_len = full_path_len;
return 0;
+oom:
+ ERROR("Out of memory while calculating dentry full path");
+ return WIMLIB_ERR_NOMEM;
}
/*
child = dentry->children;
dentry->subdir_offset = *subdir_offset_p;
- if (child) {
+ if (child) {
/* Advance the subdir offset by the amount of space the children
* of this dentry take up. */
do {
- *subdir_offset_p += child->length;
+ *subdir_offset_p += dentry_correct_total_length(child);
child = child->next;
} while (child != dentry->children);
} else {
/* On disk, childless directories have a valid subdir_offset
* that points to an 8-byte end-of-directory dentry. Regular
- * files have a subdir_offset of 0. */
+ * files or reparse points have a subdir_offset of 0. */
if (dentry_is_directory(dentry))
*subdir_offset_p += 8;
else
/* Returns the child of @dentry that has the file name @name.
* Returns NULL if no child has the name. */
struct dentry *get_dentry_child_with_name(const struct dentry *dentry,
- const char *name)
+ const char *name)
{
struct dentry *child;
size_t name_len;
/* Retrieves the dentry that has the UTF-8 @path relative to the dentry
* @cur_dir. Returns NULL if no dentry having the path is found. */
-static struct dentry *get_dentry_relative_path(struct dentry *cur_dir, const char *path)
+static struct dentry *get_dentry_relative_path(struct dentry *cur_dir,
+ const char *path)
{
struct dentry *child;
size_t base_len;
return get_dentry_relative_path(root, path);
}
-/* Returns the parent directory for the @path. */
+/* Returns the dentry that corresponds to the parent directory of @path, or NULL
+ * if the dentry is not found. */
struct dentry *get_parent_dentry(WIMStruct *w, const char *path)
{
size_t path_len = strlen(path);
return 0;
}
-/* Prints a directory entry. @lookup_table is a pointer to the lookup table, or
- * NULL if the resource entry for the dentry is not to be printed. */
+/* We want to be able to show the names of the file attribute flags that are
+ * set. */
+struct file_attr_flag {
+ u32 flag;
+ const char *name;
+};
+struct file_attr_flag file_attr_flags[] = {
+ {FILE_ATTRIBUTE_READONLY, "READONLY"},
+ {FILE_ATTRIBUTE_HIDDEN, "HIDDEN"},
+ {FILE_ATTRIBUTE_SYSTEM, "SYSTEM"},
+ {FILE_ATTRIBUTE_DIRECTORY, "DIRECTORY"},
+ {FILE_ATTRIBUTE_ARCHIVE, "ARCHIVE"},
+ {FILE_ATTRIBUTE_DEVICE, "DEVICE"},
+ {FILE_ATTRIBUTE_NORMAL, "NORMAL"},
+ {FILE_ATTRIBUTE_TEMPORARY, "TEMPORARY"},
+ {FILE_ATTRIBUTE_SPARSE_FILE, "SPARSE_FILE"},
+ {FILE_ATTRIBUTE_REPARSE_POINT, "REPARSE_POINT"},
+ {FILE_ATTRIBUTE_COMPRESSED, "COMPRESSED"},
+ {FILE_ATTRIBUTE_OFFLINE, "OFFLINE"},
+ {FILE_ATTRIBUTE_NOT_CONTENT_INDEXED,"NOT_CONTENT_INDEXED"},
+ {FILE_ATTRIBUTE_ENCRYPTED, "ENCRYPTED"},
+ {FILE_ATTRIBUTE_VIRTUAL, "VIRTUAL"},
+};
+
+/* Prints a directory entry. @lookup_table is a pointer to the lookup table, if
+ * available. If the dentry is unresolved and the lookup table is NULL, the
+ * lookup table entries will not be printed. Otherwise, they will be. */
int print_dentry(struct dentry *dentry, void *lookup_table)
{
+ const u8 *hash;
struct lookup_table_entry *lte;
+ time_t time;
+ char *p;
+
printf("[DENTRY]\n");
printf("Length = %"PRIu64"\n", dentry->length);
printf("Attributes = 0x%x\n", dentry->attributes);
-#ifdef ENABLE_SECURITY_DATA
+ for (unsigned i = 0; i < ARRAY_LEN(file_attr_flags); i++)
+ if (file_attr_flags[i].flag & dentry->attributes)
+ printf(" FILE_ATTRIBUTE_%s is set\n",
+ file_attr_flags[i].name);
printf("Security ID = %d\n", dentry->security_id);
-#endif
printf("Subdir offset = %"PRIu64"\n", dentry->subdir_offset);
- /*printf("Unused1 = %"PRIu64"\n", dentry->unused1);*/
- /*printf("Unused2 = %"PRIu64"\n", dentry->unused2);*/
- printf("Creation Time = %"PRIu64"\n", dentry->creation_time);
- printf("Last Access Time = %"PRIu64"\n", dentry->last_access_time);
- printf("Last Write Time = %"PRIu64"\n", dentry->last_write_time);
- printf("Creation Time = 0x%"PRIx64"\n", dentry->creation_time);
- printf("Hash = ");
- print_hash(dentry->hash);
- putchar('\n');
- /*printf("Reparse Tag = %u\n", dentry->reparse_tag);*/
- printf("Hard Link Group = %"PRIu64"\n", dentry->hard_link);
- /*printf("Number of Streams = %hu\n", dentry->streams);*/
+#if 0
+ printf("Unused1 = 0x%"PRIu64"\n", dentry->unused1);
+ printf("Unused2 = %"PRIu64"\n", dentry->unused2);
+#endif
+#if 0
+ printf("Creation Time = 0x%"PRIx64"\n");
+ printf("Last Access Time = 0x%"PRIx64"\n");
+ printf("Last Write Time = 0x%"PRIx64"\n");
+#endif
+
+ /* Translate the timestamps into something readable */
+ time = wim_timestamp_to_unix(dentry->creation_time);
+ p = asctime(gmtime(&time));
+ *(strrchr(p, '\n')) = '\0';
+ printf("Creation Time = %s UTC\n", p);
+
+ time = wim_timestamp_to_unix(dentry->last_access_time);
+ p = asctime(gmtime(&time));
+ *(strrchr(p, '\n')) = '\0';
+ printf("Last Access Time = %s UTC\n", p);
+
+ time = wim_timestamp_to_unix(dentry->last_write_time);
+ p = asctime(gmtime(&time));
+ *(strrchr(p, '\n')) = '\0';
+ printf("Last Write Time = %s UTC\n", p);
+
+ printf("Reparse Tag = 0x%"PRIx32"\n", dentry->reparse_tag);
+ printf("Hard Link Group = 0x%"PRIx64"\n", dentry->link_group_id);
+ printf("Number of Alternate Data Streams = %hu\n", dentry->num_ads);
printf("Filename = \"");
print_string(dentry->file_name, dentry->file_name_len);
puts("\"");
puts("\"");
printf("Short Name Length = %hu\n", dentry->short_name_len);
printf("Full Path (UTF-8) = \"%s\"\n", dentry->full_path_utf8);
- if (lookup_table) {
- lte = lookup_resource(lookup_table, dentry->hash);
- if (lte)
- print_lookup_table_entry(lte, NULL);
- else
- putchar('\n');
+ lte = dentry_stream_lte(dentry, 0, lookup_table);
+ if (lte) {
+ print_lookup_table_entry(lte);
} else {
- putchar('\n');
+ hash = dentry_stream_hash(dentry, 0);
+ if (hash) {
+ printf("Hash = 0x");
+ print_hash(hash);
+ putchar('\n');
+ putchar('\n');
+ }
+ }
+ for (u16 i = 0; i < dentry->num_ads; i++) {
+ printf("[Alternate Stream Entry %u]\n", i);
+ printf("Name = \"%s\"\n", dentry->ads_entries[i].stream_name_utf8);
+ printf("Name Length (UTF-16) = %u\n",
+ dentry->ads_entries[i].stream_name_len);
+ hash = dentry_stream_hash(dentry, i + 1);
+ if (hash) {
+ printf("Hash = 0x");
+ print_hash(hash);
+ putchar('\n');
+ }
+ print_lookup_table_entry(dentry_stream_lte(dentry, i + 1,
+ lookup_table));
}
return 0;
}
-static inline void dentry_common_init(struct dentry *dentry)
+/* Initializations done on every `struct dentry'. */
+static void dentry_common_init(struct dentry *dentry)
{
memset(dentry, 0, sizeof(struct dentry));
dentry->refcnt = 1;
-#ifdef ENABLE_SECURITY_DATA
dentry->security_id = -1;
-#endif
+ dentry->ads_entries_status = ADS_ENTRIES_DEFAULT;
+ dentry->lte_group_list.type = STREAM_TYPE_NORMAL;
}
/*
* Creates an unlinked directory entry.
*
- * @name: The base name of the new dentry.
- * @return: A pointer to the new dentry, or NULL if out of memory.
+ * @name: The UTF-8 filename of the new dentry.
+ *
+ * Returns a pointer to the new dentry, or NULL if out of memory.
*/
struct dentry *new_dentry(const char *name)
{
dentry = MALLOC(sizeof(struct dentry));
if (!dentry)
- return NULL;
+ goto err;
dentry_common_init(dentry);
- if (change_dentry_name(dentry, name) != 0) {
- FREE(dentry);
- return NULL;
- }
+ if (change_dentry_name(dentry, name) != 0)
+ goto err;
dentry_update_all_timestamps(dentry);
dentry->next = dentry;
dentry->prev = dentry;
dentry->parent = dentry;
+ INIT_LIST_HEAD(&dentry->link_group_list);
+ INIT_LIST_HEAD(&dentry->lte_group_list.list);
return dentry;
+err:
+ FREE(dentry);
+ ERROR("Failed to allocate new dentry");
+ return NULL;
}
+void dentry_free_ads_entries(struct dentry *dentry)
+{
+ for (u16 i = 0; i < dentry->num_ads; i++)
+ destroy_ads_entry(&dentry->ads_entries[i]);
+ FREE(dentry->ads_entries);
+ dentry->ads_entries = NULL;
+ dentry->num_ads = 0;
+}
-void free_dentry(struct dentry *dentry)
+static void __destroy_dentry(struct dentry *dentry)
{
FREE(dentry->file_name);
FREE(dentry->file_name_utf8);
FREE(dentry->short_name);
FREE(dentry->full_path_utf8);
+ if (dentry->extracted_file != dentry->full_path_utf8)
+ FREE(dentry->extracted_file);
+}
+
+/* Frees a WIM dentry. */
+void free_dentry(struct dentry *dentry)
+{
+ wimlib_assert(dentry);
+ __destroy_dentry(dentry);
+ /* Don't destroy the ADS entries if they "belong" to a different dentry
+ * */
+ if (dentry->ads_entries_status != ADS_ENTRIES_USER)
+ dentry_free_ads_entries(dentry);
FREE(dentry);
}
-/* Arguments for do_free_dentry(). */
-struct free_dentry_args {
- struct lookup_table *lookup_table;
- bool decrement_refcnt;
-};
+/* Like free_dentry(), but assigns a new ADS entries owner if this dentry was
+ * the previous owner, and also deletes the dentry from its link_group_list */
+void put_dentry(struct dentry *dentry)
+{
+ if (dentry->ads_entries_status == ADS_ENTRIES_OWNER) {
+ struct dentry *new_owner;
+ list_for_each_entry(new_owner, &dentry->link_group_list,
+ link_group_list)
+ {
+ if (new_owner->ads_entries_status == ADS_ENTRIES_USER) {
+ new_owner->ads_entries_status = ADS_ENTRIES_OWNER;
+ break;
+ }
+ }
+ dentry->ads_entries_status = ADS_ENTRIES_USER;
+ }
+ list_del(&dentry->link_group_list);
+ free_dentry(dentry);
+}
+
+
+/* Partically clones a dentry.
+ *
+ * Beware:
+ * - memory for file names is not cloned (the pointers are all set to NULL
+ * and the lengths are set to zero)
+ * - next, prev, and children pointers and not touched
+ * - stream entries are not cloned (pointer left untouched).
+ */
+struct dentry *clone_dentry(struct dentry *old)
+{
+ struct dentry *new = MALLOC(sizeof(struct dentry));
+ if (!new)
+ return NULL;
+ memcpy(new, old, sizeof(struct dentry));
+ new->file_name = NULL;
+ new->file_name_len = 0;
+ new->file_name_utf8 = NULL;
+ new->file_name_utf8_len = 0;
+ new->short_name = NULL;
+ new->short_name_len = 0;
+ return new;
+}
/*
* This function is passed as an argument to for_dentry_in_tree_depth() in order
* to free a directory tree. __args is a pointer to a `struct free_dentry_args'.
*/
-static int do_free_dentry(struct dentry *dentry, void *__args)
+static int do_free_dentry(struct dentry *dentry, void *__lookup_table)
{
- struct free_dentry_args *args = (struct free_dentry_args*)__args;
+ struct lookup_table *lookup_table = __lookup_table;
+ struct lookup_table_entry *lte;
+ unsigned i;
- if (args->decrement_refcnt && !dentry_is_directory(dentry)) {
- lookup_table_decrement_refcnt(args->lookup_table,
- dentry->hash);
+ if (lookup_table) {
+ for (i = 0; i <= dentry->num_ads; i++) {
+ lte = dentry_stream_lte(dentry, i, lookup_table);
+ lte_decrement_refcnt(lte, lookup_table);
+ }
}
- wimlib_assert(dentry->refcnt >= 1);
+ wimlib_assert(dentry->refcnt != 0);
if (--dentry->refcnt == 0)
free_dentry(dentry);
return 0;
* Unlinks and frees a dentry tree.
*
* @root: The root of the tree.
- * @lookup_table: The lookup table for dentries.
- * @decrement_refcnt: True if the dentries in the tree are to have their
- * reference counts in the lookup table decremented.
+ * @lookup_table: The lookup table for dentries. If non-NULL, the
+ * reference counts in the lookup table for the lookup
+ * table entries corresponding to the dentries will be
+ * decremented.
*/
-void free_dentry_tree(struct dentry *root, struct lookup_table *lookup_table,
- bool decrement_refcnt)
+void free_dentry_tree(struct dentry *root, struct lookup_table *lookup_table)
{
if (!root || !root->parent)
return;
-
- struct free_dentry_args args;
- args.lookup_table = lookup_table;
- args.decrement_refcnt = decrement_refcnt;
- for_dentry_in_tree_depth(root, do_free_dentry, &args);
+ for_dentry_in_tree_depth(root, do_free_dentry, lookup_table);
}
int increment_dentry_refcnt(struct dentry *dentry, void *ignore)
*/
void link_dentry(struct dentry *dentry, struct dentry *parent)
{
+ wimlib_assert(dentry_is_directory(parent));
dentry->parent = parent;
if (parent->children) {
/* Not an only child; link to siblings. */
}
}
-/* Unlink a dentry from the directory tree. */
+
+/* Unlink a dentry from the directory tree.
+ *
+ * Note: This merely removes it from the in-memory tree structure. See
+ * remove_dentry() in mount.c for a function implemented on top of this one that
+ * frees the dentry and implements reference counting for the lookup table
+ * entries. */
void unlink_dentry(struct dentry *dentry)
{
if (dentry_is_root(dentry))
}
}
-
-/* Recalculates the length of @dentry based on its file name length and short
- * name length. */
-static inline void recalculate_dentry_size(struct dentry *dentry)
-{
- dentry->length = WIM_DENTRY_DISK_SIZE + dentry->file_name_len +
- 2 + dentry->short_name_len;
- /* Must be multiple of 8. */
- dentry->length += (8 - dentry->length % 8) % 8;
-}
-
-/* Changes the name of a dentry to @new_name. Only changes the file_name and
- * file_name_utf8 fields; does not change the short_name, short_name_utf8, or
- * full_path_utf8 fields. Also recalculates its length. */
-int change_dentry_name(struct dentry *dentry, const char *new_name)
+/* Duplicates a UTF-8 name into UTF-8 and UTF-16 strings and returns the strings
+ * and their lengths in the pointer arguments */
+int get_names(char **name_utf16_ret, char **name_utf8_ret,
+ u16 *name_utf16_len_ret, u16 *name_utf8_len_ret,
+ const char *name)
{
size_t utf8_len;
size_t utf16_len;
+ char *name_utf16, *name_utf8;
- FREE(dentry->file_name);
-
- utf8_len = strlen(new_name);
+ utf8_len = strlen(name);
- dentry->file_name = utf8_to_utf16(new_name, utf8_len, &utf16_len);
+ name_utf16 = utf8_to_utf16(name, utf8_len, &utf16_len);
- if (!dentry->file_name)
+ if (!name_utf16)
return WIMLIB_ERR_NOMEM;
- FREE(dentry->file_name_utf8);
- dentry->file_name_utf8 = MALLOC(utf8_len + 1);
- if (!dentry->file_name_utf8) {
- FREE(dentry->file_name);
- dentry->file_name = NULL;
+ name_utf8 = MALLOC(utf8_len + 1);
+ if (!name_utf8) {
+ FREE(name_utf8);
return WIMLIB_ERR_NOMEM;
}
-
- dentry->file_name_len = utf16_len;
- dentry->file_name_utf8_len = utf8_len;
- memcpy(dentry->file_name_utf8, new_name, utf8_len + 1);
- recalculate_dentry_size(dentry);
+ memcpy(name_utf8, name, utf8_len + 1);
+ FREE(*name_utf8_ret);
+ FREE(*name_utf16_ret);
+ *name_utf8_ret = name_utf8;
+ *name_utf16_ret = name_utf16;
+ *name_utf8_len_ret = utf8_len;
+ *name_utf16_len_ret = utf16_len;
return 0;
}
+/* Changes the name of a dentry to @new_name. Only changes the file_name and
+ * file_name_utf8 fields; does not change the short_name, short_name_utf8, or
+ * full_path_utf8 fields. Also recalculates its length. */
+int change_dentry_name(struct dentry *dentry, const char *new_name)
+{
+ int ret;
+
+ ret = get_names(&dentry->file_name, &dentry->file_name_utf8,
+ &dentry->file_name_len, &dentry->file_name_utf8_len,
+ new_name);
+ FREE(dentry->short_name);
+ dentry->short_name_len = 0;
+ if (ret == 0)
+ dentry->length = dentry_correct_length(dentry);
+ return ret;
+}
+
+/*
+ * Changes the name of an alternate data stream */
+int change_ads_name(struct ads_entry *entry, const char *new_name)
+{
+ return get_names(&entry->stream_name, &entry->stream_name_utf8,
+ &entry->stream_name_len,
+ &entry->stream_name_utf8_len,
+ new_name);
+}
+
/* Parameters for calculate_dentry_statistics(). */
struct image_statistics {
struct lookup_table *lookup_table;
struct lookup_table_entry *lte;
stats = arg;
- lte = lookup_resource(stats->lookup_table, dentry->hash);
if (dentry_is_directory(dentry) && !dentry_is_root(dentry))
++*stats->dir_count;
else
++*stats->file_count;
- if (lte) {
- u64 size = lte->resource_entry.original_size;
- *stats->total_bytes += size;
- if (++lte->out_refcnt == 1)
- *stats->hard_link_bytes += size;
+ for (unsigned i = 0; i <= dentry->num_ads; i++) {
+ lte = dentry_stream_lte(dentry, i, stats->lookup_table);
+ if (lte) {
+ *stats->total_bytes += wim_resource_size(lte);
+ if (++lte->out_refcnt == 1)
+ *stats->hard_link_bytes += wim_resource_size(lte);
+ }
}
return 0;
}
+/* Calculates some statistics about a dentry tree. */
void calculate_dir_tree_statistics(struct dentry *root, struct lookup_table *table,
u64 *dir_count_ret, u64 *file_count_ret,
u64 *total_bytes_ret,
for_dentry_in_tree(root, calculate_dentry_statistics, &stats);
}
+
/*
- * Reads a directory entry from the metadata resource.
+ * Reads the alternate data stream entries for a dentry.
+ *
+ * @p: Pointer to buffer that starts with the first alternate stream entry.
+ *
+ * @dentry: Dentry to load the alternate data streams into.
+ * @dentry->num_ads must have been set to the number of
+ * alternate data streams that are expected.
+ *
+ * @remaining_size: Number of bytes of data remaining in the buffer pointed
+ * to by @p.
+ *
+ * The format of the on-disk alternate stream entries is as follows:
+ *
+ * struct ads_entry_on_disk {
+ * u64 length; // Length of the entry, in bytes. This includes
+ * all fields (including the stream name and
+ * null terminator if present, AND the padding!).
+ * u64 reserved; // Seems to be unused
+ * u8 hash[20]; // SHA1 message digest of the uncompressed stream
+ * u16 stream_name_len; // Length of the stream name, in bytes
+ * char stream_name[]; // Stream name in UTF-16LE, @stream_name_len bytes long,
+ * not including null terminator
+ * u16 zero; // UTF-16 null terminator for the stream name, NOT
+ * included in @stream_name_len. Based on what
+ * I've observed from filenames in dentries,
+ * this field should not exist when
+ * (@stream_name_len == 0), but you can't
+ * actually tell because of the padding anyway
+ * (provided that the padding is zeroed, which
+ * it always seems to be).
+ * char padding[]; // Padding to make the size a multiple of 8 bytes.
+ * };
+ *
+ * In addition, the entries are 8-byte aligned.
+ *
+ * Return 0 on success or nonzero on failure. On success, dentry->ads_entries
+ * is set to an array of `struct ads_entry's of length dentry->num_ads. On
+ * failure, @dentry is not modified.
+ */
+static int read_ads_entries(const u8 *p, struct dentry *dentry,
+ u64 remaining_size)
+{
+ u16 num_ads;
+ struct ads_entry *ads_entries;
+ int ret;
+
+ num_ads = dentry->num_ads;
+ ads_entries = CALLOC(num_ads, sizeof(struct ads_entry));
+ if (!ads_entries) {
+ ERROR("Could not allocate memory for %"PRIu16" "
+ "alternate data stream entries", num_ads);
+ return WIMLIB_ERR_NOMEM;
+ }
+
+ for (u16 i = 0; i < num_ads; i++) {
+ struct ads_entry *cur_entry = &ads_entries[i];
+ u64 length;
+ u64 length_no_padding;
+ u64 total_length;
+ size_t utf8_len;
+ const u8 *p_save = p;
+
+ /* Read the base stream entry, excluding the stream name. */
+ if (remaining_size < WIM_ADS_ENTRY_DISK_SIZE) {
+ ERROR("Stream entries go past end of metadata resource");
+ ERROR("(remaining_size = %"PRIu64")", remaining_size);
+ ret = WIMLIB_ERR_INVALID_DENTRY;
+ goto out_free_ads_entries;
+ }
+
+ p = get_u64(p, &length);
+ p += 8; /* Skip the reserved field */
+ p = get_bytes(p, SHA1_HASH_SIZE, (u8*)cur_entry->hash);
+ p = get_u16(p, &cur_entry->stream_name_len);
+
+ cur_entry->stream_name = NULL;
+ cur_entry->stream_name_utf8 = NULL;
+
+ /* Length including neither the null terminator nor the padding
+ * */
+ length_no_padding = WIM_ADS_ENTRY_DISK_SIZE +
+ cur_entry->stream_name_len;
+
+ /* Length including the null terminator and the padding */
+ total_length = ((length_no_padding + 2) + 7) & ~7;
+
+ wimlib_assert(total_length == ads_entry_total_length(cur_entry));
+
+ if (remaining_size < length_no_padding) {
+ ERROR("Stream entries go past end of metadata resource");
+ ERROR("(remaining_size = %"PRIu64" bytes, "
+ "length_no_padding = %"PRIu64" bytes)",
+ remaining_size, length_no_padding);
+ ret = WIMLIB_ERR_INVALID_DENTRY;
+ goto out_free_ads_entries;
+ }
+
+ /* The @length field in the on-disk ADS entry is expected to be
+ * equal to @total_length, which includes all of the entry and
+ * the padding that follows it to align the next ADS entry to an
+ * 8-byte boundary. However, to be safe, we'll accept the
+ * length field as long as it's not less than the un-padded
+ * total length and not more than the padded total length. */
+ if (length < length_no_padding || length > total_length) {
+ ERROR("Stream entry has unexpected length "
+ "field (length field = %"PRIu64", "
+ "unpadded total length = %"PRIu64", "
+ "padded total length = %"PRIu64")",
+ length, length_no_padding, total_length);
+ ret = WIMLIB_ERR_INVALID_DENTRY;
+ goto out_free_ads_entries;
+ }
+
+ if (cur_entry->stream_name_len) {
+ cur_entry->stream_name = MALLOC(cur_entry->stream_name_len);
+ if (!cur_entry->stream_name) {
+ ret = WIMLIB_ERR_NOMEM;
+ goto out_free_ads_entries;
+ }
+ get_bytes(p, cur_entry->stream_name_len,
+ (u8*)cur_entry->stream_name);
+ cur_entry->stream_name_utf8 = utf16_to_utf8(cur_entry->stream_name,
+ cur_entry->stream_name_len,
+ &utf8_len);
+ cur_entry->stream_name_utf8_len = utf8_len;
+
+ if (!cur_entry->stream_name_utf8) {
+ ret = WIMLIB_ERR_NOMEM;
+ goto out_free_ads_entries;
+ }
+ }
+ /* It's expected that the size of every ADS entry is a multiple
+ * of 8. However, to be safe, I'm allowing the possibility of
+ * an ADS entry at the very end of the metadata resource ending
+ * un-aligned. So although we still need to increment the input
+ * pointer by @total_length to reach the next ADS entry, it's
+ * possible that less than @total_length is actually remaining
+ * in the metadata resource. We should set the remaining size to
+ * 0 bytes if this happens. */
+ p = p_save + total_length;
+ if (remaining_size < total_length)
+ remaining_size = 0;
+ else
+ remaining_size -= total_length;
+ }
+ dentry->ads_entries = ads_entries;
+ return 0;
+out_free_ads_entries:
+ for (u16 i = 0; i < num_ads; i++) {
+ FREE(ads_entries[i].stream_name);
+ FREE(ads_entries[i].stream_name_utf8);
+ }
+ FREE(ads_entries);
+ return ret;
+}
+
+/*
+ * Reads a directory entry, including all alternate data stream entries that
+ * follow it, from the WIM image's metadata resource.
+ *
+ * @metadata_resource: Buffer containing the uncompressed metadata resource.
+ * @metadata_resource_len: Length of the metadata resource.
+ * @offset: Offset of this directory entry in the metadata resource.
+ * @dentry: A `struct dentry' that will be filled in by this function.
+ *
+ * Return 0 on success or nonzero on failure. On failure, @dentry have been
+ * modified, bu it will be left with no pointers to any allocated buffers.
+ * On success, the dentry->length field must be examined. If zero, this was a
+ * special "end of directory" dentry and not a real dentry. If nonzero, this
+ * was a real dentry.
*/
int read_dentry(const u8 metadata_resource[], u64 metadata_resource_len,
- u64 offset, struct dentry *dentry)
+ u64 offset, struct dentry *dentry)
{
const u8 *p;
u64 calculated_size;
- char *file_name;
- char *file_name_utf8;
- char *short_name;
+ char *file_name = NULL;
+ char *file_name_utf8 = NULL;
+ char *short_name = NULL;
u16 short_name_len;
u16 file_name_len;
- size_t file_name_utf8_len;
+ size_t file_name_utf8_len = 0;
+ int ret;
dentry_common_init(dentry);
/*Make sure the dentry really fits into the metadata resource.*/
- if (offset + 8 > metadata_resource_len) {
+ if (offset + 8 > metadata_resource_len || offset + 8 < offset) {
ERROR("Directory entry starting at %"PRIu64" ends past the "
- "end of the metadata resource (size %"PRIu64")!\n",
- offset, metadata_resource_len);
+ "end of the metadata resource (size %"PRIu64")",
+ offset, metadata_resource_len);
return WIMLIB_ERR_INVALID_DENTRY;
}
- /* Before reading the whole entry, we need to read just the length.
- * This is because an entry of length 8 (that is, just the length field)
+ /* Before reading the whole dentry, we need to read just the length.
+ * This is because a dentry of length 8 (that is, just the length field)
* terminates the list of sibling directory entries. */
p = get_u64(&metadata_resource[offset], &dentry->length);
/* A zero length field (really a length of 8, since that's how big the
* directory entry is...) indicates that this is the end of directory
* dentry. We do not read it into memory as an actual dentry, so just
- * return true in that case. */
+ * return successfully in that case. */
if (dentry->length == 0)
return 0;
- if (offset + dentry->length >= metadata_resource_len) {
+ /* If the dentry does not overflow the metadata resource buffer and is
+ * not too short, read the rest of it (excluding the alternate data
+ * streams, but including the file name and short name variable-length
+ * fields) into memory. */
+ if (offset + dentry->length >= metadata_resource_len
+ || offset + dentry->length < offset)
+ {
ERROR("Directory entry at offset %"PRIu64" and with size "
- "%"PRIu64" ends past the end of the metadata resource "
- "(size %"PRIu64")!\n", offset, dentry->length,
- metadata_resource_len);
+ "%"PRIu64" ends past the end of the metadata resource "
+ "(size %"PRIu64")",
+ offset, dentry->length, metadata_resource_len);
return WIMLIB_ERR_INVALID_DENTRY;
}
- /* If it is a recognized length, read the rest of the directory entry.
- * Note: The root directory entry has no name, and its length does not
- * include the short name length field. */
if (dentry->length < WIM_DENTRY_DISK_SIZE) {
- ERROR("Directory entry has invalid length of "
- "%"PRIu64" bytes\n", dentry->length);
+ ERROR("Directory entry has invalid length of %"PRIu64" bytes",
+ dentry->length);
return WIMLIB_ERR_INVALID_DENTRY;
}
p = get_u32(p, &dentry->attributes);
-#ifdef ENABLE_SECURITY_DATA
- p = get_u32(p, &dentry->security_id);
-#else
- p += sizeof(u32);
-#endif
+ p = get_u32(p, (u32*)&dentry->security_id);
p = get_u64(p, &dentry->subdir_offset);
/* 2 unused fields */
p += 2 * sizeof(u64);
+ /*p = get_u64(p, &dentry->unused1);*/
+ /*p = get_u64(p, &dentry->unused2);*/
p = get_u64(p, &dentry->creation_time);
p = get_u64(p, &dentry->last_access_time);
p = get_u64(p, &dentry->last_write_time);
- p = get_bytes(p, WIM_HASH_SIZE, dentry->hash);
+ p = get_bytes(p, SHA1_HASH_SIZE, dentry->hash);
- /* Currently ignoring reparse_tag. */
- p += sizeof(u32);
-
- /* The reparse_reserved field does not actually exist. */
+ /*
+ * I don't know what's going on here. It seems like M$ screwed up the
+ * reparse points, then put the fields in the same place and didn't
+ * document it. The WIM_HDR_FLAG_RP_FIX flag in the WIM header might
+ * have something to do with this, but it's not documented.
+ */
+ if (dentry->attributes & FILE_ATTRIBUTE_REPARSE_POINT) {
+ /* ??? */
+ p += 4;
+ p = get_u32(p, &dentry->reparse_tag);
+ p += 4;
+ } else {
+ p = get_u32(p, &dentry->reparse_tag);
+ p = get_u64(p, &dentry->link_group_id);
+ }
- p = get_u64(p, &dentry->hard_link);
+ /* By the way, the reparse_reserved field does not actually exist (at
+ * least when the file is not a reparse point) */
- /* Currently ignoring streams. */
- p += sizeof(u16);
+ p = get_u16(p, &dentry->num_ads);
p = get_u16(p, &short_name_len);
p = get_u16(p, &file_name_len);
- calculated_size = WIM_DENTRY_DISK_SIZE + file_name_len + 2 +
- short_name_len;
+ /* We now know the length of the file name and short name. Make sure
+ * the length of the dentry is large enough to actually hold them.
+ *
+ * The calculated length here is unaligned to allow for the possibility
+ * that the dentry->length names an unaligned length, although this
+ * would be unexpected. */
+ calculated_size = __dentry_correct_length_unaligned(file_name_len,
+ short_name_len);
if (dentry->length < calculated_size) {
ERROR("Unexpected end of directory entry! (Expected "
- "%"PRIu64" bytes, got %"PRIu64" bytes. "
- "short_name_len = %hu, file_name_len = %hu)\n",
- calculated_size, dentry->length,
- short_name_len, file_name_len);
+ "at least %"PRIu64" bytes, got %"PRIu64" bytes. "
+ "short_name_len = %hu, file_name_len = %hu)",
+ calculated_size, dentry->length,
+ short_name_len, file_name_len);
return WIMLIB_ERR_INVALID_DENTRY;
}
- /* Read the filename. */
- file_name = MALLOC(file_name_len);
- if (!file_name) {
- ERROR("Failed to allocate %hu bytes for dentry file name!\n",
- file_name_len);
- return WIMLIB_ERR_NOMEM;
- }
- p = get_bytes(p, file_name_len, file_name);
+ /* Read the filename if present. Note: if the filename is empty, there
+ * is no null terminator following it. */
+ if (file_name_len) {
+ file_name = MALLOC(file_name_len);
+ if (!file_name) {
+ ERROR("Failed to allocate %hu bytes for dentry file name",
+ file_name_len);
+ return WIMLIB_ERR_NOMEM;
+ }
+ p = get_bytes(p, file_name_len, file_name);
- /* Convert filename to UTF-8. */
- file_name_utf8 = utf16_to_utf8(file_name, file_name_len,
- &file_name_utf8_len);
+ /* Convert filename to UTF-8. */
+ file_name_utf8 = utf16_to_utf8(file_name, file_name_len,
+ &file_name_utf8_len);
- if (!file_name_utf8) {
- ERROR("Failed to allocate memory to convert UTF16 "
- "filename (%hu bytes) to UTF8\n",
- file_name_len);
- goto err_nomem2;
+ if (!file_name_utf8) {
+ ERROR("Failed to allocate memory to convert UTF-16 "
+ "filename (%hu bytes) to UTF-8", file_name_len);
+ ret = WIMLIB_ERR_NOMEM;
+ goto out_free_file_name;
+ }
+ if (*(u16*)p)
+ WARNING("Expected two zero bytes following the file name "
+ "`%s', but found non-zero bytes", file_name_utf8);
+ p += 2;
+ }
+
+ /* Align the calculated size */
+ calculated_size = (calculated_size + 7) & ~7;
+
+ if (dentry->length > calculated_size) {
+ /* Weird; the dentry says it's longer than it should be. Note
+ * that the length field does NOT include the size of the
+ * alternate stream entries. */
+
+ /* Strangely, some directory entries inexplicably have a little
+ * over 70 bytes of extra data. The exact amount of data seems
+ * to be 72 bytes, but it is aligned on the next 8-byte
+ * boundary. It does NOT seem to be alternate data stream
+ * entries. Here's an example of the aligned data:
+ *
+ * 01000000 40000000 6c786bba c58ede11 b0bb0026 1870892a b6adb76f
+ * e63a3e46 8fca8653 0d2effa1 6c786bba c58ede11 b0bb0026 1870892a
+ * 00000000 00000000 00000000 00000000
+ *
+ * Here's one interpretation of how the data is laid out.
+ *
+ * struct unknown {
+ * u32 field1; (always 0x00000001)
+ * u32 field2; (always 0x40000000)
+ * u8 data[48]; (???)
+ * u64 reserved1; (always 0)
+ * u64 reserved2; (always 0)
+ * };*/
+ DEBUG("Dentry for file or directory `%s' has %zu extra "
+ "bytes of data",
+ file_name_utf8, dentry->length - calculated_size);
}
- /* Undocumented padding between file name and short name. This probably
- * is supposed to be a terminating NULL character. */
- p += 2;
+ /* Read the short filename if present. Note: if there is no short
+ * filename, there is no null terminator following it. */
+ if (short_name_len) {
+ short_name = MALLOC(short_name_len);
+ if (!short_name) {
+ ERROR("Failed to allocate %hu bytes for short filename",
+ short_name_len);
+ ret = WIMLIB_ERR_NOMEM;
+ goto out_free_file_name_utf8;
+ }
- /* Read the short filename. */
- short_name = MALLOC(short_name_len);
- if (!short_name) {
- ERROR("Failed to allocate %hu bytes for short filename\n",
- short_name_len);
- goto err_nomem1;
+ p = get_bytes(p, short_name_len, short_name);
+ if (*(u16*)p)
+ WARNING("Expected two zero bytes following the file name "
+ "`%s', but found non-zero bytes", file_name_utf8);
+ p += 2;
}
- get_bytes(p, short_name_len, short_name);
+ /*
+ * Read the alternate data streams, if present. dentry->num_ads tells
+ * us how many they are, and they will directly follow the dentry
+ * on-disk.
+ *
+ * Note that each alternate data stream entry begins on an 8-byte
+ * aligned boundary, and the alternate data stream entries are NOT
+ * included in the dentry->length field for some reason.
+ */
+ if (dentry->num_ads != 0) {
+ if (calculated_size > metadata_resource_len - offset) {
+ ERROR("Not enough space in metadata resource for "
+ "alternate stream entries");
+ ret = WIMLIB_ERR_INVALID_DENTRY;
+ goto out_free_short_name;
+ }
+ ret = read_ads_entries(&metadata_resource[offset + calculated_size],
+ dentry,
+ metadata_resource_len - offset - calculated_size);
+ if (ret != 0)
+ goto out_free_short_name;
+ }
+ /* We've read all the data for this dentry. Set the names and their
+ * lengths, and we've done. */
dentry->file_name = file_name;
dentry->file_name_utf8 = file_name_utf8;
dentry->short_name = short_name;
dentry->file_name_utf8_len = file_name_utf8_len;
dentry->short_name_len = short_name_len;
return 0;
-err_nomem1:
- FREE(dentry->file_name_utf8);
-err_nomem2:
- FREE(dentry->file_name);
- return WIMLIB_ERR_NOMEM;
+out_free_short_name:
+ FREE(short_name);
+out_free_file_name_utf8:
+ FREE(file_name_utf8);
+out_free_file_name:
+ FREE(file_name);
+ return ret;
+}
+
+/* Run some miscellaneous verifications on a WIM dentry */
+int verify_dentry(struct dentry *dentry, void *wim)
+{
+ const WIMStruct *w = wim;
+ const struct lookup_table *table = w->lookup_table;
+ const struct wim_security_data *sd = wim_const_security_data(w);
+ int ret = WIMLIB_ERR_INVALID_DENTRY;
+
+ /* Check the security ID */
+ if (dentry->security_id < -1) {
+ ERROR("Dentry `%s' has an invalid security ID (%d)",
+ dentry->full_path_utf8, dentry->security_id);
+ goto out;
+ }
+ if (dentry->security_id >= sd->num_entries) {
+ ERROR("Dentry `%s' has an invalid security ID (%d) "
+ "(there are only %u entries in the security table)",
+ dentry->full_path_utf8, dentry->security_id,
+ sd->num_entries);
+ goto out;
+ }
+
+ /* Check that lookup table entries for all the resources exist, except
+ * if the SHA1 message digest is all 0's, which indicates there is
+ * intentionally no resource there. */
+ if (w->hdr.total_parts == 1) {
+ for (unsigned i = 0; i <= dentry->num_ads; i++) {
+ struct lookup_table_entry *lte;
+ const u8 *hash;
+ hash = dentry_stream_hash_unresolved(dentry, i);
+ lte = __lookup_resource(table, hash);
+ if (!lte && !is_zero_hash(hash)) {
+ ERROR("Could not find lookup table entry for stream "
+ "%u of dentry `%s'", i, dentry->full_path_utf8);
+ goto out;
+ }
+ }
+ }
+
+ /* Make sure there is only one un-named stream. */
+ unsigned num_unnamed_streams = 0;
+ for (unsigned i = 0; i <= dentry->num_ads; i++) {
+ const u8 *hash;
+ hash = dentry_stream_hash_unresolved(dentry, i);
+ if (!dentry_stream_name_len(dentry, i) && !is_zero_hash(hash))
+ num_unnamed_streams++;
+ }
+ if (num_unnamed_streams > 1) {
+ ERROR("Dentry `%s' has multiple (%u) un-named streams",
+ dentry->full_path_utf8, num_unnamed_streams);
+ goto out;
+ }
+
+ /* Cannot have a short name but no long name */
+ if (dentry->short_name_len && !dentry->file_name_len) {
+ ERROR("Dentry `%s' has a short name but no long name",
+ dentry->full_path_utf8);
+ goto out;
+ }
+
+ /* Make sure root dentry is unnamed */
+ if (dentry_is_root(dentry)) {
+ if (dentry->file_name_len) {
+ ERROR("The root dentry is named `%s', but it must "
+ "be unnamed", dentry->file_name_utf8);
+ goto out;
+ }
+ }
+
+#if 0
+ /* Check timestamps */
+ if (dentry->last_access_time < dentry->creation_time ||
+ dentry->last_write_time < dentry->creation_time) {
+ WARNING("Dentry `%s' was created after it was last accessed or "
+ "written to", dentry->full_path_utf8);
+ }
+#endif
+
+ ret = 0;
+out:
+ return ret;
}
/*
- * Writes a dentry to an output buffer.
+ * Writes a WIM dentry to an output buffer.
*
* @dentry: The dentry structure.
* @p: The memory location to write the data to.
- * @return: True on success, false on failure.
+ * @return: Pointer to the byte after the last byte we wrote as part of the
+ * dentry.
*/
static u8 *write_dentry(const struct dentry *dentry, u8 *p)
{
u8 *orig_p = p;
- memset(p, 0, dentry->length);
- p = put_u64(p, dentry->length);
+ const u8 *hash;
+
+ /* We calculate the correct length of the dentry ourselves because the
+ * dentry->length field may been set to an unexpected value from when we
+ * read the dentry in (for example, there may have been unknown data
+ * appended to the end of the dentry...) */
+ u64 length = dentry_correct_length(dentry);
+
+ p = put_u64(p, length);
p = put_u32(p, dentry->attributes);
-#ifdef ENABLE_SECURITY_DATA
p = put_u32(p, dentry->security_id);
-#else
- p = put_u32(p, (u32)(-1));
-#endif
p = put_u64(p, dentry->subdir_offset);
p = put_u64(p, 0); /* unused1 */
p = put_u64(p, 0); /* unused2 */
p = put_u64(p, dentry->creation_time);
p = put_u64(p, dentry->last_access_time);
p = put_u64(p, dentry->last_write_time);
- p = put_bytes(p, WIM_HASH_SIZE, dentry->hash);
- p = put_u32(p, 0); /* reparse_tag */
- p = put_u64(p, dentry->hard_link);
- p = put_u16(p, 0); /*streams */
+ hash = dentry_stream_hash(dentry, 0);
+ p = put_bytes(p, SHA1_HASH_SIZE, hash);
+ if (dentry->attributes & FILE_ATTRIBUTE_REPARSE_POINT) {
+ p = put_zeroes(p, 4);
+ p = put_u32(p, dentry->reparse_tag);
+ p = put_zeroes(p, 4);
+ } else {
+ u64 link_group_id;
+ p = put_u32(p, 0);
+ if (dentry->link_group_list.next == &dentry->link_group_list)
+ link_group_id = 0;
+ else
+ link_group_id = dentry->link_group_id;
+ p = put_u64(p, link_group_id);
+ }
+ p = put_u16(p, dentry->num_ads);
p = put_u16(p, dentry->short_name_len);
p = put_u16(p, dentry->file_name_len);
- p = put_bytes(p, dentry->file_name_len, (u8*)dentry->file_name);
- p = put_u16(p, 0); /* filename padding, 2 bytes. */
- p = put_bytes(p, dentry->short_name_len, (u8*)dentry->short_name);
- return orig_p + dentry->length;
+ if (dentry->file_name_len) {
+ p = put_bytes(p, dentry->file_name_len, (u8*)dentry->file_name);
+ p = put_u16(p, 0); /* filename padding, 2 bytes. */
+ }
+ if (dentry->short_name) {
+ p = put_bytes(p, dentry->short_name_len, (u8*)dentry->short_name);
+ p = put_u16(p, 0); /* short name padding, 2 bytes */
+ }
+
+ /* Align to 8-byte boundary */
+ wimlib_assert(length >= (p - orig_p)
+ && length - (p - orig_p) <= 7);
+ p = put_zeroes(p, length - (p - orig_p));
+
+ /* Write the alternate data streams, if there are any. Please see
+ * read_ads_entries() for comments about the format of the on-disk
+ * alternate data stream entries. */
+ for (u16 i = 0; i < dentry->num_ads; i++) {
+ p = put_u64(p, ads_entry_total_length(&dentry->ads_entries[i]));
+ p = put_u64(p, 0); /* Unused */
+ hash = dentry_stream_hash(dentry, i + 1);
+ p = put_bytes(p, SHA1_HASH_SIZE, hash);
+ p = put_u16(p, dentry->ads_entries[i].stream_name_len);
+ if (dentry->ads_entries[i].stream_name_len) {
+ p = put_bytes(p, dentry->ads_entries[i].stream_name_len,
+ (u8*)dentry->ads_entries[i].stream_name);
+ p = put_u16(p, 0);
+ }
+ p = put_zeroes(p, (8 - (p - orig_p) % 8) % 8);
+ }
+#ifdef ENABLE_ASSERTIONS
+ wimlib_assert(p - orig_p == __dentry_total_length(dentry, length));
+#endif
+ return p;
}
-/* Recursive function that writes a dentry tree rooted at @tree, not including
- * @tree itself, which has already been written, except in the case of the root
- * dentry, which is written right away, along with an end-of-directory entry. */
-u8 *write_dentry_tree(const struct dentry *tree, u8 *p)
+/* Recursive function that writes a dentry tree rooted at @parent, not including
+ * @parent itself, which has already been written. */
+static u8 *write_dentry_tree_recursive(const struct dentry *parent, u8 *p)
{
const struct dentry *child;
- if (dentry_is_root(tree)) {
- p = write_dentry(tree, p);
-
- /* write end of directory entry */
- p = put_u64(p, 0);
- } else {
- /* Nothing to do for a regular file. */
- if (dentry_is_regular_file(tree))
- return p;
- }
-
- /* Write child dentries and end-of-directory entry. */
- child = tree->children;
+ /* Nothing to do if this dentry has no children. */
+ if (parent->subdir_offset == 0)
+ return p;
+
+ /* Write child dentries and end-of-directory entry.
+ *
+ * Note: we need to write all of this dentry's children before
+ * recursively writing the directory trees rooted at each of the child
+ * dentries, since the on-disk dentries for a dentry's children are
+ * always located at consecutive positions in the metadata resource! */
+ child = parent->children;
if (child) {
do {
p = write_dentry(child, p);
child = child->next;
- } while (child != tree->children);
+ } while (child != parent->children);
}
/* write end of directory entry */
/* Recurse on children. */
if (child) {
do {
- p = write_dentry_tree(child, p);
+ p = write_dentry_tree_recursive(child, p);
child = child->next;
- } while (child != tree->children);
+ } while (child != parent->children);
}
return p;
}
+/* Writes a directory tree to the metadata resource.
+ *
+ * @root: Root of the dentry tree.
+ * @p: Pointer to a buffer with enough space for the dentry tree.
+ *
+ * Returns pointer to the byte after the last byte we wrote.
+ */
+u8 *write_dentry_tree(const struct dentry *root, u8 *p)
+{
+ wimlib_assert(dentry_is_root(root));
+
+ /* If we're the root dentry, we have no parent that already
+ * wrote us, so we need to write ourselves. */
+ p = write_dentry(root, p);
+
+ /* Write end of directory entry after the root dentry just to be safe;
+ * however the root dentry obviously cannot have any siblings. */
+ p = put_u64(p, 0);
+
+ /* Recursively write the rest of the dentry tree. */
+ return write_dentry_tree_recursive(root, p);
+}
+
/* Reads the children of a dentry, and all their children, ..., etc. from the
* metadata resource and into the dentry tree.
*
* @metadata_resource: An array that contains the uncompressed metadata
- * resource for the WIM file.
- * @metadata_resource_len: The length of @metadata_resource.
- * @dentry: A pointer to a struct dentry that is the root of the directory tree
- * and has already been read from the metadata resource. It does not
- * need to be the real root, because this procedure is called
- * recursively.
- * @return: True on success, false on failure.
+ * resource for the WIM file.
+ *
+ * @metadata_resource_len: The length of the uncompressed metadata resource, in
+ * bytes.
+ *
+ * @dentry: A pointer to a `struct dentry' that is the root of the directory
+ * tree and has already been read from the metadata resource. It
+ * does not need to be the real root because this procedure is
+ * called recursively.
+ *
+ * @return: Zero on success, nonzero on failure.
*/
int read_dentry_tree(const u8 metadata_resource[], u64 metadata_resource_len,
struct dentry *dentry)
struct dentry cur_child;
int ret;
- /* If @dentry is a regular file, nothing more needs to be done for this
- * branch. */
+ /*
+ * If @dentry has no child dentries, nothing more needs to be done for
+ * this branch. This is the case for regular files, symbolic links, and
+ * *possibly* empty directories (although an empty directory may also
+ * have one child dentry that is the special end-of-directory dentry)
+ */
if (cur_offset == 0)
return 0;
break;
/* Check for end of directory. */
- if (cur_child.length == 0) {
- ret = 0;
+ if (cur_child.length == 0)
break;
- }
/* Not end of directory. Allocate this child permanently and
* link it to the parent and previous child. */
child = MALLOC(sizeof(struct dentry));
if (!child) {
- ERROR("Failed to allocate %zu bytes for new dentry!\n",
- sizeof(struct dentry));
+ ERROR("Failed to allocate %zu bytes for new dentry",
+ sizeof(struct dentry));
ret = WIMLIB_ERR_NOMEM;
break;
}
break;
}
- /* Advance to the offset of the next child. */
- cur_offset += child->length;
+ /* Advance to the offset of the next child. Note: We need to
+ * advance by the TOTAL length of the dentry, not by the length
+ * child->length, which although it does take into account the
+ * padding, it DOES NOT take into account alternate stream
+ * entries. */
+ cur_offset += dentry_total_length(child);
}
- /* Link last child to first one, and set parent's
- * children pointer to the first child. */
+ /* Link last child to first one, and set parent's children pointer to
+ * the first child. */
if (prev_child) {
prev_child->next = first_child;
first_child->prev = prev_child;
git://wimlib.net / wimlib / blobdiff