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
44 #define WIM_MAGIC_LEN 8
45 #define WIM_GID_LEN 16
46 #define WIM_UNUSED_LEN 60
49 /* Length of the WIM header on disk. */
50 #define WIM_HEADER_DISK_SIZE (148 + WIM_UNUSED_LEN)
52 /* Compressed resources in the WIM are divided into separated compressed chunks
54 #define WIM_CHUNK_SIZE 32768
56 /* Version of the WIM file. There is an older version, but we don't support it
57 * yet. The differences between the versions are undocumented. */
58 #define WIM_VERSION 0x10d00
60 #define WIM_INTEGRITY_OK 0
61 #define WIM_INTEGRITY_NOT_OK -1
62 #define WIM_INTEGRITY_NONEXISTENT -2
64 /* Metadata for a resource in a WIM file. */
65 struct resource_entry {
66 /* Size, in bytes, of the resource in the WIM file. */
69 /* Bitwise or of one or more of the WIM_RESHDR_FLAG_* flags. */
72 /* Offset, in bytes, of the resource in the WIM file. */
75 /* Uncompressed size of the resource in the WIM file. Is the same as
76 * @size if the resource is uncompressed. */
80 /* Flags for the `flags' field of the struct resource_entry structure. */
82 /* I haven't seen this flag used in any of the WIMs I have examined. I assume
83 * it means that there are no references to the stream, so the space is free.
84 * However, even after deleting files from a WIM mounted with `imagex.exe
85 * /mountrw', I could not see this flag being used. Either way, we don't
86 * actually use this flag for anything. */
87 #define WIM_RESHDR_FLAG_FREE 0x01
89 /* Indicates that the stream is a metadata resource for a WIM image. */
90 #define WIM_RESHDR_FLAG_METADATA 0x02
92 /* Indicates that the stream is compressed. */
93 #define WIM_RESHDR_FLAG_COMPRESSED 0x04
95 /* I haven't seen this flag used in any of the WIMs I have examined. Perhaps it
96 * means that a stream could possibly be split among multiple split WIM parts.
97 * However, `imagex.exe /split' does not seem to create any WIMs like this.
98 * Either way, we don't actually use this flag for anything. */
99 #define WIM_RESHDR_FLAG_SPANNED 0x08
102 /* Header at the very beginning of the WIM file. */
104 /* Identifies the file as WIM file. Must be exactly
105 * {'M', 'S', 'W', 'I', 'M', 0, 0, 0} */
106 //u8 magic[WIM_MAGIC_LEN];
108 /* size of WIM header in bytes. */
111 /* Version of the WIM file. Microsoft provides no documentation about
112 * exactly what this field affects about the file format, other than the
113 * fact that more recent versions have a higher value. */
116 /* Bitwise OR of one or more of the WIM_HDR_FLAG_* defined below. */
119 /* The size of the pieces that the uncompressed files were split up into
120 * when they were compressed. This should be the same as
121 * WIM_CHUNK_SIZE. Microsoft incorrectly documents this as "the size of
122 * the compressed .wim file in bytes".*/
125 /* A unique identifier for the WIM file. */
126 u8 guid[WIM_GID_LEN];
128 /* Part number of the WIM file in a spanned set. */
131 /* Total number of parts in a spanned set. */
134 /* Number of images in the WIM file. */
137 /* Location, size, and flags of the lookup table of the WIM. */
138 struct resource_entry lookup_table_res_entry;
140 /* Location, size, and flags for the XML data of the WIM. */
141 struct resource_entry xml_res_entry;
143 /* Location, size, and flags for the boot metadata. This means the
144 * metadata resource for the image specified by boot_idx below. Should
145 * be zeroed out if boot_idx is 0. */
146 struct resource_entry boot_metadata_res_entry;
148 /* The index of the bootable image in the WIM file. If 0, there are no
149 * bootable images available. */
152 /* The location of the optional integrity table used to verify the
153 * integrity WIM. Zeroed out if there is no integrity table.*/
154 struct resource_entry integrity;
156 /* Reserved for future disuse */
157 //u8 unused[WIM_UNUSED_LEN];
160 /* Flags for the `flags' field of the struct wim_header: */
162 /* Reserved for future use */
163 #define WIM_HDR_FLAG_RESERVED 0x00000001
165 /* Files and metadata in the WIM are compressed. */
166 #define WIM_HDR_FLAG_COMPRESSION 0x00000002
168 /* WIM is read-only (wimlib ignores this because it's pretty much pointless) */
169 #define WIM_HDR_FLAG_READONLY 0x00000004
171 /* Resource data specified by images in this WIM may be contained in a different
172 * WIM. Or in other words, this WIM is part of a split WIM. */
173 #define WIM_HDR_FLAG_SPANNED 0x00000008
175 /* The WIM contains resources only; no filesystem metadata. wimlib ignores this
176 * flag, as it looks for resources in all the WIMs anyway. */
177 #define WIM_HDR_FLAG_RESOURCE_ONLY 0x00000010
179 /* The WIM contains metadata only. wimlib ignores this flag. Note that all the
180 * metadata resources for a split WIM should be in the first part. */
181 #define WIM_HDR_FLAG_METADATA_ONLY 0x00000020
183 /* Lock field to prevent multiple writers from writing the WIM concurrently.
184 * wimlib ignores this flag as it uses flock() to acquire a real lock on the
185 * file (if supported by the underlying filesystem). */
186 #define WIM_HDR_FLAG_WRITE_IN_PROGRESS 0x00000040
188 /* Reparse point fixup ???
189 * This has something to do with absolute targets of reparse points / symbolic
190 * links but I don't know what. wimlib ignores this flag. */
191 #define WIM_HDR_FLAG_RP_FIX 0x00000080
193 /* Unused, reserved flag for another compression type */
194 #define WIM_HDR_FLAG_COMPRESS_RESERVED 0x00010000
196 /* Resources within the WIM are compressed using "XPRESS" compression, which is
197 * a LZ77-based compression algorithm. */
198 #define WIM_HDR_FLAG_COMPRESS_XPRESS 0x00020000
200 /* Resources within the WIM are compressed using "LZX" compression. This is also
201 * a LZ77-based algorithm. */
202 #define WIM_HDR_FLAG_COMPRESS_LZX 0x00040000
208 /* Structure for security data. Each image in the WIM file has its own security
210 struct wim_security_data {
211 /* The total length of the security data, in bytes. If there are no
212 * security descriptors, this field may be either 8 (which is correct)
213 * or 0 (which is interpreted as 0). */
216 /* The number of security descriptors in the array @descriptors, below.
217 * It is really an unsigned int, but it must fit into an int because the
218 * security ID's are signed. (Not like you would ever have more than a
219 * few hundred security descriptors anyway.) */
222 /* Array of sizes of the descriptors in the array @descriptors. */
225 /* Array of descriptors. */
228 /* Keep track of how many WIMs reference this security data (used when
229 * exporting images between WIMs) */
235 /* Metadata resource for an image. */
236 struct image_metadata {
237 /* Pointer to the root dentry for the image. */
238 struct dentry *root_dentry;
240 /* Pointer to the security data for the image. */
241 struct wim_security_data *security_data;
243 /* A pointer to the lookup table entry for this image's metadata
245 struct lookup_table_entry *metadata_lte;
247 /* Linked list of inodes for this image. */
248 struct hlist_head inode_list;
250 /* True iff the dentry tree has been modified. If this is the case, the
251 * memory for the dentry tree is not freed when switching to a different
255 /* True iff this image has been mounted read-write. */
256 u8 has_been_mounted_rw : 1;
259 #define WIMLIB_RESOURCE_FLAG_RAW 0x1
260 #define WIMLIB_RESOURCE_FLAG_MULTITHREADED 0x2
261 #define WIMLIB_RESOURCE_FLAG_RECOMPRESS 0x4
263 /* The opaque structure exposed to the wimlib API. */
266 /* A pointer to the file indicated by @filename, opened for reading. */
270 /* Extra file pointers to be used by concurrent readers */
272 size_t num_allocated_fps;
273 pthread_mutex_t fp_tab_mutex;
276 /* FILE pointer for the WIM file (if any) currently being written. */
279 /* The name of the WIM file that has been opened. */
282 /* The lookup table for the WIM file. */
283 struct lookup_table *lookup_table;
285 /* Pointer to the XML data read from the WIM file. */
288 /* Information retrieved from the XML data, arranged in an orderly
290 struct wim_info *wim_info;
292 /* Array of the image metadata, one for each image in the WIM. */
293 struct image_metadata *image_metadata;
295 /* The header of the WIM file. */
296 struct wim_header hdr;
298 /* Temporary fields */
304 struct _ntfs_volume *ntfs_vol;
307 /* The currently selected image, indexed starting at 1. If not 0,
308 * subtract 1 from this to get the index of the current image in the
309 * image_metadata array. */
312 /* %true iff any images have been deleted from this WIM. */
313 bool deletion_occurred;
317 /* Inline utility functions for WIMStructs. */
319 static inline struct dentry *wim_root_dentry(WIMStruct *w)
321 return w->image_metadata[w->current_image - 1].root_dentry;
324 static inline struct wim_security_data *
325 wim_security_data(WIMStruct *w)
327 return w->image_metadata[w->current_image - 1].security_data;
329 static inline const struct wim_security_data *
330 wim_const_security_data(const WIMStruct *w)
332 return w->image_metadata[w->current_image - 1].security_data;
335 static inline struct lookup_table_entry*
336 wim_metadata_lookup_table_entry(WIMStruct *w)
338 return w->image_metadata[w->current_image - 1].metadata_lte;
341 /* Nonzero if a struct resource_entry indicates a compressed resource. */
342 static inline int resource_is_compressed(const struct resource_entry *entry)
344 return (entry->flags & WIM_RESHDR_FLAG_COMPRESSED);
347 static inline struct image_metadata *
348 wim_get_current_image_metadata(WIMStruct *w)
350 return &w->image_metadata[w->current_image - 1];
353 struct pattern_list {
356 size_t num_allocated_pats;
359 struct capture_config {
360 struct pattern_list exclusion_list;
361 struct pattern_list exclusion_exception;
362 struct pattern_list compression_exclusion_list;
363 struct pattern_list alignment_list;
371 /* Hash table to find inodes, identified by their inode ID.
374 /* Fields for the hash table */
375 struct hlist_head *array;
380 * Linked list of "extra" inodes. These may be:
382 * - inodes with link count 1, which are all allowed to have 0 for their
383 * inode number, meaning we cannot insert them into the hash table
384 * before calling assign_inode_numbers().
386 * - Groups we create ourselves by splitting a nominal inode due to
387 * inconsistencies in the dentries. These inodes will share a inode
388 * ID with some other inode until assign_inode_numbers() is called.
390 struct hlist_head extra_inodes;
393 extern int init_inode_table(struct inode_table *table, size_t capacity);
394 static inline void destroy_inode_table(struct inode_table *table)
398 extern int inode_table_insert(struct dentry *dentry, void *__table);
399 extern u64 assign_inode_numbers(struct hlist_head *inode_list);
400 extern int fix_inodes(struct inode_table *table, struct hlist_head *inode_list);
404 extern int read_header(FILE *fp, struct wim_header *hdr, int split_ok);
405 extern int write_header(const struct wim_header *hdr, FILE *out);
406 extern int init_header(struct wim_header *hdr, int ctype);
409 extern int write_integrity_table(FILE *out,
410 struct resource_entry *integrity_res_entry,
411 off_t new_lookup_table_end,
412 off_t old_lookup_table_end,
413 wimlib_progress_func_t progress_func);
415 extern int check_wim_integrity(WIMStruct *w,
416 wimlib_progress_func_t progress_func);
420 extern int new_joined_lookup_table(WIMStruct *w,
421 WIMStruct **additional_swms,
422 unsigned num_additional_swms,
423 struct lookup_table **table_ret);
425 extern int verify_swm_set(WIMStruct *w,
426 WIMStruct **additional_swms,
427 unsigned num_additional_swms);
429 extern void destroy_image_metadata(struct image_metadata *imd,
430 struct lookup_table *lt);
431 extern bool exclude_path(const char *path,
432 const struct capture_config *config,
433 bool exclude_prefix);
434 extern int do_add_image(WIMStruct *w, const char *dir, const char *name,
435 const char *config_str, size_t config_len,
437 int (*capture_tree)(struct dentry **, const char *,
438 struct lookup_table *,
439 struct wim_security_data *,
440 const struct capture_config *,
443 wimlib_progress_func_t progress_func);
451 unsigned num_lutimes_warnings;
452 struct list_head *stream_list;
453 union wimlib_progress_info progress;
455 struct _ntfs_volume *vol;
457 struct list_head empty_files;
458 wimlib_progress_func_t progress_func;
461 extern int apply_dentry_ntfs(struct dentry *dentry, void *arg);
462 extern int apply_dentry_timestamps_ntfs(struct dentry *dentry, void *arg);
465 extern int build_dentry_tree_ntfs(struct dentry **root_p,
467 struct lookup_table *lookup_table,
468 struct wim_security_data *sd,
469 const struct capture_config *config,
471 wimlib_progress_func_t progress_func,
475 extern const u8 *get_resource_entry(const u8 *p, struct resource_entry *entry);
476 extern u8 *put_resource_entry(u8 *p, const struct resource_entry *entry);
478 extern int read_uncompressed_resource(FILE *fp, u64 offset, u64 size, u8 buf[]);
480 extern int read_wim_resource(const struct lookup_table_entry *lte, u8 buf[],
481 size_t size, u64 offset, int flags);
483 extern int read_full_wim_resource(const struct lookup_table_entry *lte,
484 u8 buf[], int flags);
486 extern int write_wim_resource(struct lookup_table_entry *lte,
487 FILE *out_fp, int out_ctype,
488 struct resource_entry *out_res_entry,
491 extern int extract_wim_resource_to_fd(const struct lookup_table_entry *lte,
495 extern int extract_full_wim_resource_to_fd(const struct lookup_table_entry *lte,
498 extern int read_metadata_resource(WIMStruct *w,
499 struct image_metadata *image_metadata);
502 extern int write_dentry_resources(struct dentry *dentry, void *wim_p);
503 extern int copy_resource(struct lookup_table_entry *lte, void *w);
504 extern int write_metadata_resource(WIMStruct *w);
508 int read_security_data(const u8 metadata_resource[],
509 u64 metadata_resource_len, struct wim_security_data **sd_p);
511 void print_security_data(const struct wim_security_data *sd);
512 u8 *write_security_data(const struct wim_security_data *sd, u8 *p);
513 void free_security_data(struct wim_security_data *sd);
516 ssize_t inode_readlink(const struct inode *inode, char *buf, size_t buf_len,
517 const WIMStruct *w, int read_resource_flags);
518 extern void *make_symlink_reparse_data_buf(const char *symlink_target,
520 extern int inode_set_symlink(struct inode *inode,
522 struct lookup_table *lookup_table,
523 struct lookup_table_entry **lte_ret);
526 extern WIMStruct *new_wim_struct();
527 extern int select_wim_image(WIMStruct *w, int image);
528 extern int wim_hdr_flags_compression_type(int wim_hdr_flags);
529 extern int for_image(WIMStruct *w, int image, int (*visitor)(WIMStruct *));
531 /* Internal use only */
532 #define WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE 0x80000000
533 #define WIMLIB_WRITE_FLAG_REUSE_INTEGRITY_TABLE 0x40000000
534 #define WIMLIB_WRITE_FLAG_CHECKPOINT_AFTER_XML 0x20000000
535 #define WIMLIB_WRITE_MASK_PUBLIC 0x1fffffff
537 /* Internal use only */
538 #define WIMLIB_EXTRACT_FLAG_MULTI_IMAGE 0x80000000
539 #define WIMLIB_EXTRACT_FLAG_NO_STREAMS 0x40000000
540 #define WIMLIB_EXTRACT_MASK_PUBLIC 0x3fffffff
544 extern int begin_write(WIMStruct *w, const char *path, int write_flags);
545 extern void close_wim_writable(WIMStruct *w);
547 extern int finish_write(WIMStruct *w, int image, int write_flags,
548 wimlib_progress_func_t progress_func);
550 #if defined(HAVE_SYS_FILE_H) && defined(HAVE_FLOCK)
551 extern int lock_wim(FILE *fp, const char *path);
553 static inline int lock_wim(FILE *fp, const char *path)
559 #endif /* _WIMLIB_INTERNAL_H */