1 #ifndef _WIMLIB_DENTRY_H
2 #define _WIMLIB_DENTRY_H
4 #include "wimlib/case.h"
5 #include "wimlib/compiler.h"
6 #include "wimlib/inode.h"
7 #include "wimlib/list.h"
8 #include "wimlib/rbtree.h"
9 #include "wimlib/types.h"
12 struct wim_lookup_table;
13 struct wim_lookup_table_entry;
14 struct wim_security_data;
16 /* Base size of a WIM dentry in the on-disk format, up to and including the file
17 * name length. This does not include the variable-length file name, short
18 * name, alternate data stream entries, and padding to 8-byte boundaries. */
19 #define WIM_DENTRY_DISK_SIZE 102
22 * In-memory structure for a WIM directory entry (dentry). There is a directory
23 * tree for each image in the WIM.
25 * Note that this is a directory entry and not an inode. Since NTFS allows hard
26 * links, it's possible for a NTFS inode to correspond to multiple WIM dentries.
27 * The hard link group ID field of the on-disk WIM dentry tells us the number of
28 * the NTFS inode that the dentry corresponds to (and this gets placed in
31 * Unfortunately, WIM files do not have an analogue to an inode; instead certain
32 * information, such as file attributes, the security descriptor, and file
33 * streams is replicated in each hard-linked dentry, even though this
34 * information really is associated with an inode. In-memory, we fix up this
35 * flaw by allocating a `struct wim_inode' for each dentry that contains some of
36 * this duplicated information, then combining the inodes for each hard link
39 * Confusingly, it's possible for stream information to be missing from a dentry
40 * in a hard link set, in which case the stream information needs to be gotten
41 * from one of the other dentries in the hard link set. In addition, it is
42 * possible for dentries to have inconsistent security IDs, file attributes, or
43 * file streams when they share the same hard link ID (don't even ask. I hope
44 * that Microsoft may have fixed this problem, since I've only noticed it in the
45 * 'install.wim' for Windows 7). For those dentries, we have to use the
46 * conflicting fields to split up the hard link groups. (See
47 * dentry_tree_fix_inodes() in inode_fixup.c.)
50 /* Pointer to the inode for this dentry. This will contain some
51 * information that was factored out of the on-disk WIM dentry as common
52 * to all dentries in a hard link group. */
53 struct wim_inode *d_inode;
55 /* Node for the parent's red-black tree of child dentries, sorted by
56 * case sensitive long name. */
57 struct rb_node rb_node;
59 /* Node for the parent's red-black tree of child dentries, sorted by
60 * case insensitive long name. */
61 struct rb_node rb_node_case_insensitive;
63 /* List of dentries in a directory that have different case sensitive
64 * long names but share the same case insensitive long name */
65 struct list_head case_insensitive_conflict_list;
67 /* Length of UTF-16LE encoded short filename, in bytes, not including
68 * the terminating zero wide-character. */
69 u16 short_name_nbytes;
71 /* Length of UTF-16LE encoded "long" file name, in bytes, not including
72 * the terminating null character. */
75 /* Length of full path name encoded using "tchars", in bytes, not
76 * including the terminating null character. */
79 /* During extraction extractions, this flag will be set after the
80 * "skeleton" of the dentry has been extracted. */
81 u8 skeleton_extracted : 1;
83 /* When capturing from a NTFS volume using NTFS-3g, this flag is set on
84 * dentries that were created from a filename in the WIN32 or WIN32+DOS
85 * namespaces rather than the POSIX namespace. Otherwise this will
89 /* Temporary flag; always reset to 0 when done using. */
92 /* Set to 1 if this name was extracted as a link, so no streams need to
93 * be extracted to it. */
96 /* Temporary list field */
97 struct list_head tmp_list;
99 /* Links list of dentries being extracted */
100 struct list_head extraction_list;
102 /* Linked list node that places this dentry in the list of aliases for
103 * its inode (d_inode) */
104 struct list_head d_alias;
106 /* The parent of this directory entry. */
107 struct wim_dentry *parent;
109 /* 'length' and 'subdir_offset' are only used while reading and writing
110 * this dentry; see the corresponding field in
111 * `struct wim_dentry_on_disk' for explanation. */
115 /* These correspond to the two unused fields in the on-disk WIM dentry;
116 * we read them into memory so we can write them unchanged. These
117 * fields are set to 0 on new dentries. */
121 /* Pointer to the UTF-16LE short filename (malloc()ed buffer), or NULL
122 * if this dentry has no short name. */
123 utf16lechar *short_name;
125 /* Pointer to the UTF-16LE filename (malloc()ed buffer), or NULL if this
126 * dentry has no filename. */
127 utf16lechar *file_name;
129 /* Full path to this dentry in the WIM, in platform-dependent tchars
130 * that can be printed without conversion. By default this field will
131 * be NULL and will only be calculated on-demand by the
132 * calculate_dentry_full_path() or dentry_full_path() functions. */
135 /* (Extraction only) Actual name to extract this dentry as, along with
136 * its length in tchars excluding the NULL terminator. This usually
137 * will be the same as file_name, with the character encoding converted
138 * if needed. But if file_name contains characters not accepted on the
139 * current platform, then this may be set slightly differently from
140 * file_name. This will be either NULL or a malloc()ed buffer that may
141 * alias file_name. */
142 tchar *extraction_name;
143 size_t extraction_name_nchars;
146 #define rbnode_dentry(node) container_of(node, struct wim_dentry, rb_node)
149 dentry_is_first_in_inode(const struct wim_dentry *dentry)
151 return inode_first_dentry(dentry->d_inode) == dentry;
155 dentry_out_total_length(const struct wim_dentry *dentry);
158 for_dentry_in_tree(struct wim_dentry *root,
159 int (*visitor)(struct wim_dentry*, void*),
163 for_dentry_in_rbtree(struct rb_node *node,
164 int (*visitor)(struct wim_dentry *, void *),
168 for_dentry_child(const struct wim_dentry *dentry,
169 int (*visitor)(struct wim_dentry *, void *),
173 for_dentry_in_tree_depth(struct wim_dentry *root,
174 int (*visitor)(struct wim_dentry*, void*),
178 calculate_subdir_offsets(struct wim_dentry *dentry, u64 *subdir_offset_p);
181 dentry_set_name(struct wim_dentry *dentry, const tchar *new_name);
183 extern struct wim_dentry *
184 get_dentry(struct WIMStruct *wim, const tchar *path,
185 CASE_SENSITIVITY_TYPE case_type);
187 extern struct wim_dentry *
188 get_dentry_child_with_name(const struct wim_dentry *dentry,
190 CASE_SENSITIVITY_TYPE case_type);
192 extern struct wim_dentry *
193 get_dentry_child_with_utf16le_name(const struct wim_dentry *dentry,
194 const utf16lechar *name,
196 CASE_SENSITIVITY_TYPE case_type);
198 extern struct wim_dentry *
199 get_parent_dentry(struct WIMStruct *wim, const tchar *path,
200 CASE_SENSITIVITY_TYPE case_type);
204 #define LOOKUP_FLAG_ADS_OK 0x00000001
205 #define LOOKUP_FLAG_DIRECTORY_OK 0x00000002
208 wim_pathname_to_stream(WIMStruct *wim,
211 struct wim_dentry **dentry_ret,
212 struct wim_lookup_table_entry **lte_ret,
213 u16 *stream_idx_ret);
217 calculate_dentry_full_path(struct wim_dentry *dentry);
220 calculate_dentry_tree_full_paths(struct wim_dentry *root);
223 dentry_full_path(struct wim_dentry *dentry);
226 new_dentry(const tchar *name, struct wim_dentry **dentry_ret);
229 new_dentry_with_inode(const tchar *name, struct wim_dentry **dentry_ret);
232 new_dentry_with_timeless_inode(const tchar *name, struct wim_dentry **dentry_ret);
235 dentry_tree_clear_inode_visited(struct wim_dentry *root);
238 new_filler_directory(const tchar *name, struct wim_dentry **dentry_ret);
241 free_dentry(struct wim_dentry *dentry);
244 put_dentry(struct wim_dentry *dentry);
247 free_dentry_tree(struct wim_dentry *root,
248 struct wim_lookup_table *lookup_table);
251 unlink_dentry(struct wim_dentry *dentry);
253 extern struct wim_dentry *
254 dentry_add_child(struct wim_dentry * restrict parent,
255 struct wim_dentry * restrict child);
258 rename_wim_path(WIMStruct *wim, const tchar *from, const tchar *to,
259 CASE_SENSITIVITY_TYPE case_type);
263 read_dentry_tree(const u8 *buf, size_t buf_len,
264 u64 root_offset, struct wim_dentry **root_ret);
267 write_dentry_tree(const struct wim_dentry * restrict tree,
271 dentry_is_root(const struct wim_dentry *dentry)
273 return dentry->parent == dentry;
277 dentry_is_directory(const struct wim_dentry *dentry)
279 return inode_is_directory(dentry->d_inode);
283 dentry_has_children(const struct wim_dentry *dentry)
285 return inode_has_children(dentry->d_inode);
289 dentry_has_short_name(const struct wim_dentry *dentry)
291 return dentry->short_name_nbytes != 0;
295 dentry_has_long_name(const struct wim_dentry *dentry)
297 return dentry->file_name_nbytes != 0;
301 dentry_tree_fix_inodes(struct wim_dentry *root, struct list_head *inode_list);
302 #endif /* _WIMLIB_DENTRY_H */