1 #ifndef _WIMLIB_DENTRY_H
2 #define _WIMLIB_DENTRY_H
4 #include "wimlib/avl_tree.h"
5 #include "wimlib/case.h"
6 #include "wimlib/compiler.h"
7 #include "wimlib/inode.h"
8 #include "wimlib/list.h"
9 #include "wimlib/types.h"
14 /* Base size of a WIM dentry in the on-disk format, up to and including the file
15 * name length. This does not include the variable-length file name, short
16 * name, extra stream entries, and padding to 8-byte boundaries. */
17 #define WIM_DENTRY_DISK_SIZE 102
20 * In-memory structure for a WIM directory entry (dentry). There is a directory
21 * tree for each image in the WIM.
23 * Note that this is a directory entry and not an inode. Since NTFS allows hard
24 * links, it's possible for an NTFS inode to correspond to multiple WIM
25 * dentries. The hard link group ID field of the on-disk WIM dentry tells us
26 * the number of the NTFS inode that the dentry corresponds to (and this gets
27 * placed in d_inode->i_ino).
29 * Unfortunately, WIM files do not have an analogue to an inode; instead certain
30 * information, such as file attributes, the security descriptor, and streams is
31 * replicated in each hard-linked dentry, even though this information really is
32 * associated with an inode. In-memory, we fix up this flaw by allocating a
33 * `struct wim_inode' for each dentry that contains some of this duplicated
34 * information, then combining the inodes for each hard link group together.
35 * (See dentry_tree_fix_inodes().)
38 /* Pointer to the inode for this dentry. This will contain some
39 * information that was factored out of the on-disk WIM dentry as common
40 * to all dentries in a hard link group. */
41 struct wim_inode *d_inode;
43 /* Node for the parent's balanced binary search tree of child dentries
44 * sorted by case sensitive long name (root i_children). */
45 struct avl_tree_node d_index_node;
47 /* Node for the parent's balanced binary search tree of child dentries,
48 * sorted by case insensitive long name (root i_children_ci). */
49 struct avl_tree_node d_index_node_ci;
51 /* List of dentries in a directory that have different case sensitive
52 * long names but share the same case insensitive long name. */
53 struct list_head d_ci_conflict_list;
55 /* The parent of this directory entry. (The root is its own parent.) */
56 struct wim_dentry *d_parent;
58 /* Linked list node that places this dentry in the list of aliases for
59 * its inode (d_inode) */
60 struct hlist_node d_alias;
62 /* Pointer to the UTF-16LE short filename (malloc()ed buffer), or NULL
63 * if this dentry has no short name. */
64 utf16lechar *short_name;
66 /* Pointer to the UTF-16LE filename (malloc()ed buffer), or NULL if this
67 * dentry has no filename. */
68 utf16lechar *file_name;
70 /* Length of UTF-16LE encoded short filename, in bytes, not including
71 * the terminating zero wide-character. */
72 u16 short_name_nbytes;
74 /* Length of UTF-16LE encoded "long" file name, in bytes, not including
75 * the terminating null character. */
78 /* When capturing from an NTFS volume using NTFS-3g, this flag is set on
79 * dentries that were created from a filename in the WIN32 or WIN32+DOS
80 * namespaces rather than the POSIX namespace. Otherwise this will
84 /* Temporary flag; always reset to 0 when done using. */
87 /* Used by wimlib_update_image() */
91 /* 'subdir_offset' is only used while reading and writing this
92 * dentry. See the corresponding field in `struct
93 * wim_dentry_on_disk' for explanation. */
96 /* Temporary list field */
97 struct list_head tmp_list;
100 /* Full path to this dentry in the WIM, in platform-dependent tchars
101 * that can be printed without conversion. By default this field will
102 * be NULL and will only be calculated on-demand by the
103 * calculate_dentry_full_path() or dentry_full_path() functions. */
106 /* (Extraction only) Actual name to extract this dentry as. This may be
107 * either in 'tchars' or in 'utf16lechars', depending on what encoding
108 * the extraction backend needs. This may alias 'file_name'. If it
109 * doesn't, it is an allocated buffer which must be freed. */
110 void *d_extraction_name;
112 /* (Extraction only) Number of characters in d_extraction_name. */
113 size_t d_extraction_name_nchars;
115 /* (Extraction only) Linked list node that connects all dentries being
116 * extracted as part of the current extraction operation. */
117 struct list_head d_extraction_list_node;
119 /* (Extraction only) Linked list node that connects all dentries being
120 * extracted as aliases of the same inode as part of the current
121 * extraction operation. */
122 struct list_head d_extraction_alias_node;
126 will_extract_dentry(const struct wim_dentry *dentry)
128 return dentry->d_extraction_list_node.next != NULL;
132 dentry_out_total_length(const struct wim_dentry *dentry);
135 for_dentry_in_tree(struct wim_dentry *root,
136 int (*visitor)(struct wim_dentry*, void*),
139 /* Iterate through each @child dentry of the @dir directory inode,
140 * in sorted order by case sensitive name. */
141 #define for_inode_child(child, dir) \
142 avl_tree_for_each_in_order((child), (dir)->i_children, \
143 struct wim_dentry, d_index_node)
145 /* Iterate through each @child dentry of the @parent dentry,
146 * in sorted order by case sensitive name. */
147 #define for_dentry_child(child, parent) \
148 for_inode_child((child), (parent)->d_inode)
150 /* Iterate through each @child dentry of the @dir directory inode,
151 * in sorted order by case insensitive name. */
152 #define for_inode_child_case_insensitive(child, dir) \
153 avl_tree_for_each_in_order((child), (dir)->i_children_ci, \
154 struct wim_dentry, d_index_node_ci)
156 /* Iterate through each @child dentry of the @parent dentry,
157 * in sorted order by case insensitive name. */
158 #define for_dentry_child_case_insensitive(child, parent) \
159 for_inode_child_case_insensitive((child), (parent)->d_inode)
161 /* Iterate through each @child dentry of the @dir directory inode,
162 * in postorder (safe for freeing the child dentries). */
163 #define for_inode_child_postorder(child, dir) \
164 avl_tree_for_each_in_postorder((child), (dir)->i_children, \
165 struct wim_dentry, d_index_node)
167 /* Iterate through each @child dentry of the @parent dentry,
168 * in postorder (safe for freeing the child dentries). */
169 #define for_dentry_child_postorder(child, parent) \
170 for_inode_child_postorder((child), (parent)->d_inode)
172 /* Get any child dentry of the @dir directory inode. Requires
173 * inode_has_children(@dir) == true. */
174 #define inode_any_child(dir) \
175 avl_tree_entry((dir)->i_children, struct wim_dentry, d_index_node)
177 /* Get any child dentry of the @parent dentry. Requires
178 * dentry_has_children(@parent) == true. */
179 #define dentry_any_child(parent) \
180 inode_any_child((parent)->d_inode)
183 calculate_subdir_offsets(struct wim_dentry *root, u64 *subdir_offset_p);
186 dentry_set_name(struct wim_dentry *dentry, const tchar *new_name);
189 dentry_set_name_utf16le(struct wim_dentry *dentry, const utf16lechar *new_name,
190 size_t new_name_nbytes);
192 extern struct wim_dentry *
193 get_dentry(struct WIMStruct *wim, const tchar *path,
194 CASE_SENSITIVITY_TYPE case_type);
196 extern struct wim_dentry *
197 get_dentry_child_with_name(const struct wim_dentry *dentry,
199 CASE_SENSITIVITY_TYPE case_type);
201 extern struct wim_dentry *
202 get_dentry_child_with_utf16le_name(const struct wim_dentry *dentry,
203 const utf16lechar *name,
205 CASE_SENSITIVITY_TYPE case_type);
207 extern struct wim_dentry *
208 get_parent_dentry(struct WIMStruct *wim, const tchar *path,
209 CASE_SENSITIVITY_TYPE case_type);
212 calculate_dentry_full_path(struct wim_dentry *dentry);
215 dentry_full_path(struct wim_dentry *dentry);
218 new_dentry_with_new_inode(const tchar *name, bool set_timestamps,
219 struct wim_dentry **dentry_ret);
222 new_dentry_with_existing_inode(const tchar *name, struct wim_inode *inode,
223 struct wim_dentry **dentry_ret);
226 dentry_tree_clear_inode_visited(struct wim_dentry *root);
229 new_filler_directory(struct wim_dentry **dentry_ret);
232 free_dentry(struct wim_dentry *dentry);
235 free_dentry_tree(struct wim_dentry *root,
236 struct blob_table *blob_table);
239 unlink_dentry(struct wim_dentry *dentry);
241 extern struct wim_dentry *
242 dentry_add_child(struct wim_dentry *parent, struct wim_dentry *child);
244 struct update_command_journal;
247 rename_wim_path(WIMStruct *wim, const tchar *from, const tchar *to,
248 CASE_SENSITIVITY_TYPE case_type,
249 struct update_command_journal *j);
253 read_dentry_tree(const u8 *buf, size_t buf_len,
254 u64 root_offset, struct wim_dentry **root_ret);
257 write_dentry_tree(struct wim_dentry *root, u8 *p);
260 dentry_is_root(const struct wim_dentry *dentry)
262 return dentry->d_parent == dentry;
266 dentry_is_directory(const struct wim_dentry *dentry)
268 return inode_is_directory(dentry->d_inode);
272 dentry_has_children(const struct wim_dentry *dentry)
274 return inode_has_children(dentry->d_inode);
278 dentry_has_short_name(const struct wim_dentry *dentry)
280 return dentry->short_name_nbytes != 0;
284 dentry_has_long_name(const struct wim_dentry *dentry)
286 return dentry->file_name_nbytes != 0;
288 #endif /* _WIMLIB_DENTRY_H */