4 * Internal header for wimlib.
8 * Copyright (C) 2010 Carl Thijssen
9 * Copyright (C) 2012 Eric Biggers
11 * This file is part of wimlib, a library for working with WIM files.
13 * wimlib is free software; you can redistribute it and/or modify it under the
14 * terms of the GNU General Public License as published by the Free
15 * Software Foundation; either version 3 of the License, or (at your option)
18 * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
19 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
20 * A PARTICULAR PURPOSE. See the GNU General Public License for more
23 * You should have received a copy of the GNU General Public License
24 * along with wimlib; if not, see http://www.gnu.org/licenses/.
27 #ifndef _WIMLIB_INTERNAL_H
28 #define _WIMLIB_INTERNAL_H
36 #define WIM_MAGIC_LEN 8
37 #define WIM_GID_LEN 16
38 #define WIM_UNUSED_LEN 60
41 /* Length of the WIM header on disk. */
42 #define WIM_HEADER_DISK_SIZE (148 + WIM_UNUSED_LEN)
44 /* Compressed resources in the WIM are divided into separated compressed chunks
46 #define WIM_CHUNK_SIZE 32768
48 /* Version of the WIM file. There is an older version, but we don't support it
49 * yet. The differences between the versions are undocumented. */
50 #define WIM_VERSION 0x10d00
52 enum wim_integrity_status {
55 WIM_INTEGRITY_NONEXISTENT,
58 /* Metadata for a resource in a WIM file. */
59 struct resource_entry {
60 /* Size, in bytes, of the resource in the WIM file. */
63 /* Bitwise or of one or more of the WIM_RESHDR_FLAG_* flags. */
66 /* Offset, in bytes, of the resource in the WIM file. */
69 /* Uncompressed size of the resource in the WIM file. Is the same as
70 * @size if the resource is uncompressed. */
74 /* Flags for the `flags' field of the struct resource_entry structure. */
76 /* I haven't seen this flag used in any of the WIMs I have examined. I assume
77 * it means that there are no references to the stream, so the space is free.
78 * However, even after deleting files from a WIM mounted with `imagex.exe
79 * /mountrw', I could not see this flag being used. Either way, we don't
80 * actually use this flag for anything. */
81 #define WIM_RESHDR_FLAG_FREE 0x01
83 /* Indicates that the stream is a metadata resource for a WIM image. */
84 #define WIM_RESHDR_FLAG_METADATA 0x02
86 /* Indicates that the stream is compressed. */
87 #define WIM_RESHDR_FLAG_COMPRESSED 0x04
89 /* I haven't seen this flag used in any of the WIMs I have examined. Perhaps it
90 * means that a stream could possibly be split among multiple split WIM parts.
91 * However, `imagex.exe /split' does not seem to create any WIMs like this.
92 * Either way, we don't actually use this flag for anything. */
93 #define WIM_RESHDR_FLAG_SPANNED 0x08
96 /* Header at the very beginning of the WIM file. */
98 /* Identifies the file as WIM file. Must be exactly
99 * {'M', 'S', 'W', 'I', 'M', 0, 0, 0} */
100 //u8 magic[WIM_MAGIC_LEN];
102 /* size of WIM header in bytes. */
105 /* Version of the WIM file. M$ provides no documentation about exactly
106 * what this field affects about the file format, other than the fact
107 * that more recent versions have a higher value. */
110 /* Bitwise OR of one or more of the WIM_HDR_FLAG_* defined below. */
113 /* The size of the pieces that the uncompressed files were split up into
114 * when they were compressed. This should be the same as
115 * WIM_CHUNK_SIZE. M$ incorrectly documents this as "the size of the
116 * compressed .wim file in bytes".*/
119 /* A unique identifier for the WIM file. */
120 u8 guid[WIM_GID_LEN];
122 /* Part number of the WIM file in a spanned set. */
125 /* Total number of parts in a spanned set. */
128 /* Number of images in the WIM file. */
131 /* Location, size, and flags of the lookup table of the WIM. */
132 struct resource_entry lookup_table_res_entry;
134 /* Location, size, and flags for the XML data of the WIM. */
135 struct resource_entry xml_res_entry;
137 /* Location, size, and flags for the boot metadata. This means the
138 * metadata resource for the image specified by boot_idx below. Should
139 * be zeroed out if boot_idx is 0. */
140 struct resource_entry boot_metadata_res_entry;
142 /* The index of the bootable image in the WIM file. If 0, there are no
143 * bootable images available. */
146 /* The location of the optional integrity table used to verify the
147 * integrity WIM. Zeroed out if there is no integrity table.*/
148 struct resource_entry integrity;
150 /* Reserved for future disuse */
151 //u8 unused[WIM_UNUSED_LEN];
154 /* Flags for the `flags' field of the struct wim_header: */
156 /* Reserved for future use by M$ */
157 #define WIM_HDR_FLAG_RESERVED 0x00000001
159 /* Files and metadata in the WIM are compressed. */
160 #define WIM_HDR_FLAG_COMPRESSION 0x00000002
162 /* WIM is read-only (we ignore this). */
163 #define WIM_HDR_FLAG_READONLY 0x00000004
165 /* Resource data specified by images in this WIM may be contained in a different
166 * WIM. Or in other words, this WIM is part of a split WIM. */
167 #define WIM_HDR_FLAG_SPANNED 0x00000008
169 /* The WIM contains resources only; no filesystem metadata. We ignore this
170 * flag, as we look for file resources in all the WIMs anyway. */
171 #define WIM_HDR_FLAG_RESOURCE_ONLY 0x00000010
173 /* The WIM contains metadata only. We ignore this flag. Note that all the
174 * metadata resources for a split WIM should be in the first part. */
175 #define WIM_HDR_FLAG_METADATA_ONLY 0x00000020
177 /* Lock field to prevent multiple writers from writing the WIM concurrently. We
178 * ignore this flag. */
179 #define WIM_HDR_FLAG_WRITE_IN_PROGRESS 0x00000040
181 /* Reparse point fixup ???
182 * This has something to do with absolute targets of reparse points / symbolic
183 * links but I don't know what. We ignore this flag. */
184 #define WIM_HDR_FLAG_RP_FIX 0x00000080
186 /* Unused, reserved flag for another compression type */
187 #define WIM_HDR_FLAG_COMPRESS_RESERVED 0x00010000
189 /* Resources within the WIM are compressed using "XPRESS" compression, which is
190 * a LZ77-based compression algorithm. */
191 #define WIM_HDR_FLAG_COMPRESS_XPRESS 0x00020000
193 /* Resources within the WIM are compressed using "LZX" compression. This is also
194 * a LZ77-based algorithm. */
195 #define WIM_HDR_FLAG_COMPRESS_LZX 0x00040000
201 /* Structure for security data. Each image in the WIM file has its own security
203 struct wim_security_data {
204 /* The total length of the security data, in bytes. A typical size is
205 * 2048 bytes. If there is no security data, though (as in the WIMs
206 * that wimlib writes, currently), it will be 8 bytes. */
209 /* The number of security descriptors in the array @descriptors, below.
210 * It is really an unsigned int, but it must fit into an int because the
211 * security ID's are signed. (Not like you would ever have more than a
212 * few hundred security descriptors anyway). */
215 /* Array of sizes of the descriptors in the array @descriptors. */
218 /* Array of descriptors. */
221 /* keep track of how many WIMs reference this security data (used when
222 * exporting images between WIMs) */
229 /* Metadata resource for an image. */
230 struct image_metadata {
231 /* Pointer to the root dentry for the image. */
232 struct dentry *root_dentry;
234 /* Pointer to the security data for the image. */
235 struct wim_security_data *security_data;
237 /* A pointer to the lookup table entry for this image's metadata
239 struct lookup_table_entry *metadata_lte;
241 /* True if the filesystem of the image has been modified. If this is
242 * the case, the memory for the filesystem is not freed when switching
243 * to a different WIM image. */
248 /* The opaque structure exposed to the wimlib API. */
249 typedef struct WIMStruct {
251 /* A pointer to the file indicated by @filename, opened for reading. */
254 /* FILE pointer for the WIM file that is being written. */
257 /* The name of the WIM file that has been opened. */
260 /* The lookup table for the WIM file. */
261 struct lookup_table *lookup_table;
263 /* Pointer to the XML data read from the WIM file. */
266 /* Information retrieved from the XML data, arranged
267 * in an orderly manner. */
268 struct wim_info *wim_info;
270 /* Array of the image metadata of length image_count. Each image in the
271 * WIM has a image metadata associated with it. */
272 struct image_metadata *image_metadata;
274 /* The header of the WIM file. */
275 struct wim_header hdr;
277 /* Temporary flags to use when extracting a WIM image or adding a WIM
286 struct _ntfs_volume *ntfs_vol;
289 /* The currently selected image, indexed starting at 1. If not 0,
290 * subtract 1 from this to get the index of the current image in the
291 * image_metadata array. */
296 /* Inline utility functions for WIMStructs. */
298 static inline struct dentry *wim_root_dentry(WIMStruct *w)
300 return w->image_metadata[w->current_image - 1].root_dentry;
303 static inline struct wim_security_data *
304 wim_security_data(WIMStruct *w)
306 return w->image_metadata[w->current_image - 1].security_data;
308 static inline const struct wim_security_data *
309 wim_const_security_data(const WIMStruct *w)
311 return w->image_metadata[w->current_image - 1].security_data;
314 static inline struct lookup_table_entry*
315 wim_metadata_lookup_table_entry(WIMStruct *w)
317 return w->image_metadata[w->current_image - 1].metadata_lte;
320 /* Nonzero if a struct resource_entry indicates a compressed resource. */
321 static inline int resource_is_compressed(const struct resource_entry *entry)
323 return (entry->flags & WIM_RESHDR_FLAG_COMPRESSED);
326 static inline struct image_metadata *
327 wim_get_current_image_metadata(WIMStruct *w)
329 return &w->image_metadata[w->current_image - 1];
332 struct pattern_list {
335 size_t num_allocated_pats;
338 struct capture_config {
339 struct pattern_list exclusion_list;
340 struct pattern_list exclusion_exception;
341 struct pattern_list compression_exclusion_list;
342 struct pattern_list alignment_list;
350 struct inode_table *new_inode_table(size_t capacity);
351 int inode_table_insert(struct dentry *dentry, void *__table);
352 void free_inode_table(struct inode_table *table);
353 u64 assign_inode_numbers(struct hlist_head *inode_list);
354 int fix_inodes(struct inode_table *table, struct hlist_head *inode_list);
358 extern int read_header(FILE *fp, struct wim_header *hdr, int split_ok);
359 extern int write_header(const struct wim_header *hdr, FILE *out);
360 extern int init_header(struct wim_header *hdr, int ctype);
363 extern int write_integrity_table(FILE *out, u64 end_header_offset,
364 u64 end_lookup_table_offset,
366 extern int check_wim_integrity(WIMStruct *w, int show_progress, int *status);
370 extern int new_joined_lookup_table(WIMStruct *w,
371 WIMStruct **additional_swms,
372 unsigned num_additional_swms,
373 struct lookup_table **table_ret);
375 extern int verify_swm_set(WIMStruct *w,
376 WIMStruct **additional_swms,
377 unsigned num_additional_swms);
379 extern void destroy_image_metadata(struct image_metadata *imd,
380 struct lookup_table *lt);
381 extern bool exclude_path(const char *path,
382 const struct capture_config *config,
383 bool exclude_prefix);
384 extern int do_add_image(WIMStruct *w, const char *dir, const char *name,
385 const char *config_str, size_t config_len,
387 int (*capture_tree)(struct dentry **, const char *,
388 struct lookup_table *,
389 struct wim_security_data *,
390 const struct capture_config *,
395 extern const u8 *get_resource_entry(const u8 *p, struct resource_entry *entry);
396 extern u8 *put_resource_entry(u8 *p, const struct resource_entry *entry);
398 extern int read_uncompressed_resource(FILE *fp, u64 offset, u64 size, u8 buf[]);
400 extern int read_wim_resource(const struct lookup_table_entry *lte, u8 buf[],
401 size_t size, u64 offset, bool raw);
403 extern int read_full_wim_resource(const struct lookup_table_entry *lte, u8 buf[]);
405 extern int extract_wim_resource_to_fd(const struct lookup_table_entry *lte,
409 extern int extract_full_wim_resource_to_fd(const struct lookup_table_entry *lte,
412 extern int read_metadata_resource(WIMStruct *w,
413 struct image_metadata *image_metadata);
416 extern int write_dentry_resources(struct dentry *dentry, void *wim_p);
417 extern int copy_resource(struct lookup_table_entry *lte, void *w);
418 extern int write_metadata_resource(WIMStruct *w);
422 int read_security_data(const u8 metadata_resource[],
423 u64 metadata_resource_len, struct wim_security_data **sd_p);
425 void print_security_data(const struct wim_security_data *sd);
426 u8 *write_security_data(const struct wim_security_data *sd, u8 *p);
427 void free_security_data(struct wim_security_data *sd);
430 ssize_t inode_readlink(const struct inode *inode, char *buf, size_t buf_len,
432 extern void *make_symlink_reparse_data_buf(const char *symlink_target,
434 extern int inode_set_symlink(struct inode *inode,
436 struct lookup_table *lookup_table,
437 struct lookup_table_entry **lte_ret);
440 extern WIMStruct *new_wim_struct();
441 extern int wimlib_select_image(WIMStruct *w, int image);
442 extern int wim_hdr_flags_compression_type(int wim_hdr_flags);
443 extern int for_image(WIMStruct *w, int image, int (*visitor)(WIMStruct *));
446 extern int finish_write(WIMStruct *w, int image, int flags,
447 int write_lookup_table);
449 extern int begin_write(WIMStruct *w, const char *path, int flags);
454 #endif /* _WIMLIB_INTERNAL_H */