wimlib.net Git - wimlib/blob - src/wim.c

   1 /*
   2  * wim.c - Stuff that doesn't fit into any other file
   3  */
   4
   5 /*
   6  * Copyright (C) 2012, 2013 Eric Biggers
   7  *
   8  * This file is part of wimlib, a library for working with WIM files.
   9  *
  10  * wimlib is free software; you can redistribute it and/or modify it under the
  11  * terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 3 of the License, or (at your option)
  13  * any later version.
  14  *
  15  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  16  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  17  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include "config.h"
  26 #endif
  27
  28 #include "wimlib/error.h"
  29 #include "wimlib/dentry.h"
  30 #include "wimlib/encoding.h"
  31 #include "wimlib/file_io.h"
  32 #include "wimlib/integrity.h"
  33 #include "wimlib/lookup_table.h"
  34 #include "wimlib/metadata.h"
  35 #ifdef WITH_NTFS_3G
  36 #  include "wimlib/ntfs_3g.h" /* for do_ntfs_umount() */
  37 #endif
  38 #include "wimlib/security.h"
  39 #include "wimlib/wim.h"
  40 #include "wimlib/xml.h"
  41
  42 #ifdef __WIN32__
  43 #  include "wimlib/win32.h" /* for realpath() replacement */
  44 #endif
  45
  46 #include <errno.h>
  47 #include <fcntl.h>
  48 #ifndef __WIN32__
  49 #  include <langinfo.h>
  50 #endif
  51 #include <limits.h>
  52 #include <stdarg.h>
  53 #include <stdlib.h>
  54 #include <unistd.h>
  55
  56 static int
  57 image_print_metadata(WIMStruct *wim)
  58 {
  59         DEBUG("Printing metadata for image %d", wim->current_image);
  60         print_wim_security_data(wim_security_data(wim));
  61         return for_dentry_in_tree(wim_root_dentry(wim), print_dentry,
  62                                   wim->lookup_table);
  63 }
  64
  65
  66 static WIMStruct *
  67 new_wim_struct(void)
  68 {
  69         WIMStruct *wim = CALLOC(1, sizeof(WIMStruct));
  70         if (wim) {
  71                 wim->in_fd.fd = -1;
  72                 wim->out_fd.fd = -1;
  73         }
  74         INIT_LIST_HEAD(&wim->subwims);
  75         return wim;
  76 }
  77
  78 /*
  79  * Calls a function on images in the WIM.  If @image is WIMLIB_ALL_IMAGES, @visitor
  80  * is called on the WIM once for each image, with each image selected as the
  81  * current image in turn.  If @image is a certain image, @visitor is called on
  82  * the WIM only once, with that image selected.
  83  */
  84 int
  85 for_image(WIMStruct *wim, int image, int (*visitor)(WIMStruct *))
  86 {
  87         int ret;
  88         int start;
  89         int end;
  90         int i;
  91
  92         if (image == WIMLIB_ALL_IMAGES) {
  93                 start = 1;
  94                 end = wim->hdr.image_count;
  95         } else if (image >= 1 && image <= wim->hdr.image_count) {
  96                 start = image;
  97                 end = image;
  98         } else {
  99                 return WIMLIB_ERR_INVALID_IMAGE;
 100         }
 101         for (i = start; i <= end; i++) {
 102                 ret = select_wim_image(wim, i);
 103                 if (ret != 0)
 104                         return ret;
 105                 ret = visitor(wim);
 106                 if (ret != 0)
 107                         return ret;
 108         }
 109         return 0;
 110 }
 111
 112 /* API function documented in wimlib.h  */
 113 WIMLIBAPI int
 114 wimlib_create_new_wim(int ctype, WIMStruct **wim_ret)
 115 {
 116         WIMStruct *wim;
 117         struct wim_lookup_table *table;
 118         int ret;
 119
 120         wimlib_global_init(WIMLIB_INIT_FLAG_ASSUME_UTF8);
 121
 122         DEBUG("Creating new WIM with %"TS" compression.",
 123               wimlib_get_compression_type_string(ctype));
 124
 125         /* Allocate the WIMStruct. */
 126         wim = new_wim_struct();
 127         if (!wim)
 128                 return WIMLIB_ERR_NOMEM;
 129
 130         ret = init_wim_header(&wim->hdr, ctype);
 131         if (ret != 0)
 132                 goto out_free;
 133
 134         table = new_lookup_table(9001);
 135         if (!table) {
 136                 ret = WIMLIB_ERR_NOMEM;
 137                 goto out_free;
 138         }
 139         wim->lookup_table = table;
 140         wim->refcnts_ok = 1;
 141         wim->compression_type = ctype;
 142         *wim_ret = wim;
 143         return 0;
 144 out_free:
 145         FREE(wim);
 146         return ret;
 147 }
 148
 149 int
 150 select_wim_image(WIMStruct *wim, int image)
 151 {
 152         struct wim_image_metadata *imd;
 153         int ret;
 154
 155         DEBUG("Selecting image %d", image);
 156
 157         if (image == WIMLIB_NO_IMAGE) {
 158                 ERROR("Invalid image: %d", WIMLIB_NO_IMAGE);
 159                 return WIMLIB_ERR_INVALID_IMAGE;
 160         }
 161
 162         if (image == wim->current_image)
 163                 return 0;
 164
 165         if (image < 1 || image > wim->hdr.image_count) {
 166                 ERROR("Cannot select image %d: There are only %u images",
 167                       image, wim->hdr.image_count);
 168                 return WIMLIB_ERR_INVALID_IMAGE;
 169         }
 170
 171         if (!wim_has_metadata(wim)) {
 172                 ERROR("\"%"TS"\" does not contain metadata resources!", wim->filename);
 173                 if (wim->hdr.part_number != 1)
 174                         ERROR("Specify the first part of the split WIM instead.");
 175                 return WIMLIB_ERR_METADATA_NOT_FOUND;
 176         }
 177
 178         /* If a valid image is currently selected, it can be freed if it is not
 179          * modified.  */
 180         if (wim->current_image != WIMLIB_NO_IMAGE) {
 181                 imd = wim_get_current_image_metadata(wim);
 182                 if (!imd->modified) {
 183                         wimlib_assert(list_empty(&imd->unhashed_streams));
 184                         DEBUG("Freeing image %u", wim->current_image);
 185                         destroy_image_metadata(imd, NULL, false);
 186                 }
 187         }
 188         wim->current_image = image;
 189         imd = wim_get_current_image_metadata(wim);
 190         if (imd->root_dentry || imd->modified) {
 191                 ret = 0;
 192         } else {
 193                 #ifdef ENABLE_DEBUG
 194                 DEBUG("Reading metadata resource specified by the following "
 195                       "lookup table entry:");
 196                 print_lookup_table_entry(imd->metadata_lte, stderr);
 197                 #endif
 198                 ret = read_metadata_resource(wim, imd);
 199                 if (ret)
 200                         wim->current_image = WIMLIB_NO_IMAGE;
 201         }
 202         return ret;
 203 }
 204
 205
 206 /* API function documented in wimlib.h  */
 207 WIMLIBAPI const tchar *
 208 wimlib_get_compression_type_string(int ctype)
 209 {
 210         switch (ctype) {
 211                 case WIMLIB_COMPRESSION_TYPE_NONE:
 212                         return T("None");
 213                 case WIMLIB_COMPRESSION_TYPE_LZX:
 214                         return T("LZX");
 215                 case WIMLIB_COMPRESSION_TYPE_XPRESS:
 216                         return T("XPRESS");
 217                 default:
 218                         return T("Invalid");
 219         }
 220 }
 221
 222 /* API function documented in wimlib.h  */
 223 WIMLIBAPI int
 224 wimlib_resolve_image(WIMStruct *wim, const tchar *image_name_or_num)
 225 {
 226         tchar *p;
 227         long image;
 228         int i;
 229
 230         if (!image_name_or_num || !*image_name_or_num)
 231                 return WIMLIB_NO_IMAGE;
 232
 233         if (!tstrcasecmp(image_name_or_num, T("all"))
 234             || !tstrcasecmp(image_name_or_num, T("*")))
 235                 return WIMLIB_ALL_IMAGES;
 236         image = tstrtol(image_name_or_num, &p, 10);
 237         if (p != image_name_or_num && *p == T('\0') && image > 0) {
 238                 if (image > wim->hdr.image_count)
 239                         return WIMLIB_NO_IMAGE;
 240                 return image;
 241         } else {
 242                 for (i = 1; i <= wim->hdr.image_count; i++) {
 243                         if (!tstrcmp(image_name_or_num,
 244                                      wimlib_get_image_name(wim, i)))
 245                                 return i;
 246                 }
 247                 return WIMLIB_NO_IMAGE;
 248         }
 249 }
 250
 251 /* API function documented in wimlib.h  */
 252 WIMLIBAPI void
 253 wimlib_print_available_images(const WIMStruct *wim, int image)
 254 {
 255         int first;
 256         int last;
 257         int i;
 258         int n;
 259         if (image == WIMLIB_ALL_IMAGES) {
 260                 n = tprintf(T("Available Images:\n"));
 261                 first = 1;
 262                 last = wim->hdr.image_count;
 263         } else if (image >= 1 && image <= wim->hdr.image_count) {
 264                 n = tprintf(T("Information for Image %d\n"), image);
 265                 first = image;
 266                 last = image;
 267         } else {
 268                 tprintf(T("wimlib_print_available_images(): Invalid image %d"),
 269                         image);
 270                 return;
 271         }
 272         for (i = 0; i < n - 1; i++)
 273                 tputchar(T('-'));
 274         tputchar(T('\n'));
 275         for (i = first; i <= last; i++)
 276                 print_image_info(wim->wim_info, i);
 277 }
 278
 279
 280 /* API function documented in wimlib.h  */
 281 WIMLIBAPI int
 282 wimlib_print_metadata(WIMStruct *wim, int image)
 283 {
 284         return for_image(wim, image, image_print_metadata);
 285 }
 286
 287 /* API function documented in wimlib.h  */
 288 WIMLIBAPI int
 289 wimlib_get_wim_info(WIMStruct *wim, struct wimlib_wim_info *info)
 290 {
 291         memset(info, 0, sizeof(struct wimlib_wim_info));
 292         memcpy(info->guid, wim->hdr.guid, WIMLIB_GUID_LEN);
 293         info->image_count = wim->hdr.image_count;
 294         info->boot_index = wim->hdr.boot_idx;
 295         info->wim_version = WIM_VERSION;
 296         info->chunk_size = WIM_CHUNK_SIZE;
 297         info->part_number = wim->hdr.part_number;
 298         info->total_parts = wim->hdr.total_parts;
 299         info->compression_type = wim->compression_type;
 300         info->total_bytes = wim_info_get_total_bytes(wim->wim_info);
 301         info->has_integrity_table = wim_has_integrity_table(wim);
 302         info->opened_from_file = (wim->filename != NULL);
 303         info->is_readonly = (wim->hdr.flags & WIM_HDR_FLAG_READONLY) ||
 304                              (wim->hdr.total_parts != 1) ||
 305                              (wim->filename && taccess(wim->filename, W_OK));
 306         info->has_rpfix = (wim->hdr.flags & WIM_HDR_FLAG_RP_FIX) != 0;
 307         info->is_marked_readonly = (wim->hdr.flags & WIM_HDR_FLAG_READONLY) != 0;
 308         info->write_in_progress = (wim->hdr.flags & WIM_HDR_FLAG_WRITE_IN_PROGRESS) != 0;
 309         info->metadata_only = (wim->hdr.flags & WIM_HDR_FLAG_METADATA_ONLY) != 0;
 310         info->resource_only = (wim->hdr.flags & WIM_HDR_FLAG_RESOURCE_ONLY) != 0;
 311         info->spanned = (wim->hdr.flags & WIM_HDR_FLAG_SPANNED) != 0;
 312         info->pipable = wim_is_pipable(wim);
 313         return 0;
 314 }
 315
 316 /* API function documented in wimlib.h  */
 317 WIMLIBAPI int
 318 wimlib_set_wim_info(WIMStruct *wim, const struct wimlib_wim_info *info, int which)
 319 {
 320         int ret;
 321
 322         if (which & WIMLIB_CHANGE_READONLY_FLAG) {
 323                 if (info->is_marked_readonly)
 324                         wim->hdr.flags |= WIM_HDR_FLAG_READONLY;
 325                 else
 326                         wim->hdr.flags &= ~WIM_HDR_FLAG_READONLY;
 327         }
 328
 329         if ((which & ~WIMLIB_CHANGE_READONLY_FLAG) == 0)
 330                 return 0;
 331
 332         ret = can_modify_wim(wim);
 333         if (ret)
 334                 return ret;
 335
 336         if (which & WIMLIB_CHANGE_GUID) {
 337                 memcpy(wim->hdr.guid, info->guid, WIM_GID_LEN);
 338                 wim->guid_set_explicitly = 1;
 339         }
 340
 341         if (which & WIMLIB_CHANGE_BOOT_INDEX) {
 342                 if (info->boot_index > wim->hdr.image_count) {
 343                         ERROR("%u is not 0 or a valid image in the WIM to mark as bootable",
 344                               info->boot_index);
 345                         return WIMLIB_ERR_INVALID_IMAGE;
 346                 }
 347                 wim->hdr.boot_idx = info->boot_index;
 348         }
 349
 350         if (which & WIMLIB_CHANGE_RPFIX_FLAG) {
 351                 if (info->has_rpfix)
 352                         wim->hdr.flags |= WIM_HDR_FLAG_RP_FIX;
 353                 else
 354                         wim->hdr.flags &= ~WIM_HDR_FLAG_RP_FIX;
 355         }
 356         return 0;
 357 }
 358
 359 static int
 360 do_open_wim(const tchar *filename, struct filedes *fd_ret)
 361 {
 362         int raw_fd;
 363
 364         raw_fd = topen(filename, O_RDONLY | O_BINARY);
 365         if (raw_fd < 0) {
 366                 ERROR_WITH_ERRNO("Can't open \"%"TS"\" read-only", filename);
 367                 return WIMLIB_ERR_OPEN;
 368         }
 369         filedes_init(fd_ret, raw_fd);
 370         return 0;
 371 }
 372
 373 int
 374 reopen_wim(WIMStruct *wim)
 375 {
 376         wimlib_assert(!filedes_valid(&wim->in_fd));
 377         return do_open_wim(wim->filename, &wim->in_fd);
 378 }
 379
 380 int
 381 close_wim(WIMStruct *wim)
 382 {
 383         if (filedes_valid(&wim->in_fd)) {
 384                 filedes_close(&wim->in_fd);
 385                 filedes_invalidate(&wim->in_fd);
 386         }
 387         return 0;
 388 }
 389
 390 /*
 391  * Begins the reading of a WIM file; opens the file and reads its header and
 392  * lookup table, and optionally checks the integrity.
 393  */
 394 static int
 395 begin_read(WIMStruct *wim, const void *wim_filename_or_fd,
 396            int open_flags, wimlib_progress_func_t progress_func)
 397 {
 398         int ret;
 399         int xml_num_images;
 400         const tchar *wimfile;
 401
 402         if (open_flags & WIMLIB_OPEN_FLAG_FROM_PIPE) {
 403                 wimfile = NULL;
 404                 filedes_init(&wim->in_fd, *(const int*)wim_filename_or_fd);
 405                 wim->in_fd.is_pipe = 1;
 406         } else {
 407                 wimfile = wim_filename_or_fd;
 408                 DEBUG("Reading the WIM file `%"TS"'", wimfile);
 409                 ret = do_open_wim(wimfile, &wim->in_fd);
 410                 if (ret)
 411                         return ret;
 412
 413                 /* The absolute path to the WIM is requested so that
 414                  * wimlib_overwrite() still works even if the process changes
 415                  * its working directory.  This actually happens if a WIM is
 416                  * mounted read-write, since the FUSE thread changes directory
 417                  * to "/", and it needs to be able to find the WIM file again.
 418                  *
 419                  * This will break if the full path to the WIM changes in the
 420                  * intervening time...
 421                  *
 422                  * Warning: in Windows native builds, realpath() calls the
 423                  * replacement function in win32.c.
 424                  */
 425                 wim->filename = realpath(wimfile, NULL);
 426                 if (!wim->filename) {
 427                         ERROR_WITH_ERRNO("Failed to resolve WIM filename");
 428                         if (errno == ENOMEM)
 429                                 return WIMLIB_ERR_NOMEM;
 430                         else
 431                                 return WIMLIB_ERR_OPEN;
 432                 }
 433         }
 434
 435         ret = read_wim_header(wim->filename, &wim->in_fd, &wim->hdr);
 436         if (ret)
 437                 return ret;
 438
 439         if (wim->hdr.flags & WIM_HDR_FLAG_WRITE_IN_PROGRESS) {
 440                 WARNING("The WIM_HDR_FLAG_WRITE_IN_PROGRESS is set in the header of \"%"TS"\".\n"
 441                         "          It may be being changed by another process, or a process\n"
 442                         "          may have crashed while writing the WIM.", wimfile);
 443         }
 444
 445         if (open_flags & WIMLIB_OPEN_FLAG_WRITE_ACCESS) {
 446                 ret = can_modify_wim(wim);
 447                 if (ret)
 448                         return ret;
 449         }
 450
 451         if (wim->hdr.total_parts != 1 && !(open_flags & WIMLIB_OPEN_FLAG_SPLIT_OK)) {
 452                 ERROR("\"%"TS"\": This WIM is part %u of a %u-part WIM",
 453                       wimfile, wim->hdr.part_number, wim->hdr.total_parts);
 454                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 455         }
 456
 457         DEBUG("According to header, WIM contains %u images", wim->hdr.image_count);
 458
 459         /* If the boot index is invalid, print a warning and set it to 0 */
 460         if (wim->hdr.boot_idx > wim->hdr.image_count) {
 461                 WARNING("In `%"TS"', image %u is marked as bootable, "
 462                         "but there are only %u images in the WIM",
 463                         wimfile, wim->hdr.boot_idx, wim->hdr.image_count);
 464                 wim->hdr.boot_idx = 0;
 465         }
 466
 467         /* Check and cache the compression type */
 468         if (wim->hdr.flags & WIM_HDR_FLAG_COMPRESSION) {
 469                 if (wim->hdr.flags & WIM_HDR_FLAG_COMPRESS_LZX) {
 470                         if (wim->hdr.flags & WIM_HDR_FLAG_COMPRESS_XPRESS) {
 471                                 ERROR("Multiple compression flags are set in \"%"TS"\"",
 472                                       wimfile);
 473                                 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
 474                         }
 475                         wim->compression_type = WIMLIB_COMPRESSION_TYPE_LZX;
 476                 } else if (wim->hdr.flags & WIM_HDR_FLAG_COMPRESS_XPRESS) {
 477                         wim->compression_type = WIMLIB_COMPRESSION_TYPE_XPRESS;
 478                 } else {
 479                         ERROR("The compression flag is set on \"%"TS"\", but "
 480                               "neither the XPRESS nor LZX flag is set",
 481                               wimfile);
 482                         return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
 483                 }
 484         } else {
 485                 wim->compression_type = WIMLIB_COMPRESSION_TYPE_NONE;
 486         }
 487
 488         if (open_flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY) {
 489                 ret = check_wim_integrity(wim, progress_func);
 490                 if (ret == WIM_INTEGRITY_NONEXISTENT) {
 491                         WARNING("No integrity information for `%"TS"'; skipping "
 492                                 "integrity check.", wimfile);
 493                 } else if (ret == WIM_INTEGRITY_NOT_OK) {
 494                         ERROR("WIM is not intact! (Failed integrity check)");
 495                         return WIMLIB_ERR_INTEGRITY;
 496                 } else if (ret != WIM_INTEGRITY_OK) {
 497                         return ret;
 498                 }
 499         }
 500
 501         if (wim->hdr.image_count != 0 && wim->hdr.part_number == 1) {
 502                 wim->image_metadata = new_image_metadata_array(wim->hdr.image_count);
 503                 if (!wim->image_metadata)
 504                         return WIMLIB_ERR_NOMEM;
 505         }
 506
 507         if (open_flags & WIMLIB_OPEN_FLAG_FROM_PIPE) {
 508                 wim->lookup_table = new_lookup_table(9001);
 509                 if (!wim->lookup_table)
 510                         return WIMLIB_ERR_NOMEM;
 511         } else {
 512                 ret = read_wim_lookup_table(wim);
 513                 if (ret)
 514                         return ret;
 515
 516                 ret = read_wim_xml_data(wim);
 517                 if (ret)
 518                         return ret;
 519
 520                 xml_num_images = wim_info_get_num_images(wim->wim_info);
 521                 if (xml_num_images != wim->hdr.image_count) {
 522                         ERROR("In the file `%"TS"', there are %u <IMAGE> elements "
 523                               "in the XML data,", wimfile, xml_num_images);
 524                         ERROR("but %u images in the WIM!  There must be exactly one "
 525                               "<IMAGE> element per image.", wim->hdr.image_count);
 526                         return WIMLIB_ERR_IMAGE_COUNT;
 527                 }
 528                 DEBUG("Done beginning read of WIM file `%"TS"'.", wimfile);
 529         }
 530         return 0;
 531 }
 532
 533 int
 534 open_wim_as_WIMStruct(const void *wim_filename_or_fd, int open_flags,
 535                       WIMStruct **wim_ret, wimlib_progress_func_t progress_func)
 536 {
 537         WIMStruct *wim;
 538         int ret;
 539
 540         wimlib_global_init(WIMLIB_INIT_FLAG_ASSUME_UTF8);
 541
 542         ret = WIMLIB_ERR_INVALID_PARAM;
 543         if (!wim_ret)
 544                 goto out;
 545
 546         ret = WIMLIB_ERR_NOMEM;
 547         wim = new_wim_struct();
 548         if (!wim)
 549                 goto out;
 550
 551         ret = begin_read(wim, wim_filename_or_fd, open_flags, progress_func);
 552         if (ret)
 553                 goto out_wimlib_free;
 554
 555         ret = 0;
 556         *wim_ret = wim;
 557         goto out;
 558 out_wimlib_free:
 559         wimlib_free(wim);
 560 out:
 561         return ret;
 562 }
 563
 564 /* API function documented in wimlib.h  */
 565 WIMLIBAPI int
 566 wimlib_open_wim(const tchar *wimfile, int open_flags,
 567                 WIMStruct **wim_ret, wimlib_progress_func_t progress_func)
 568 {
 569         open_flags &= WIMLIB_OPEN_MASK_PUBLIC;
 570         return open_wim_as_WIMStruct(wimfile, open_flags, wim_ret,
 571                                      progress_func);
 572 }
 573
 574 void
 575 destroy_image_metadata(struct wim_image_metadata *imd,
 576                        struct wim_lookup_table *table,
 577                        bool free_metadata_lte)
 578 {
 579         free_dentry_tree(imd->root_dentry, table);
 580         imd->root_dentry = NULL;
 581         free_wim_security_data(imd->security_data);
 582         imd->security_data = NULL;
 583
 584         if (free_metadata_lte) {
 585                 free_lookup_table_entry(imd->metadata_lte);
 586                 imd->metadata_lte = NULL;
 587         }
 588         if (!table) {
 589                 struct wim_lookup_table_entry *lte, *tmp;
 590                 list_for_each_entry_safe(lte, tmp, &imd->unhashed_streams, unhashed_list)
 591                         free_lookup_table_entry(lte);
 592         }
 593         INIT_LIST_HEAD(&imd->unhashed_streams);
 594         INIT_LIST_HEAD(&imd->inode_list);
 595 #ifdef WITH_NTFS_3G
 596         if (imd->ntfs_vol) {
 597                 do_ntfs_umount(imd->ntfs_vol);
 598                 imd->ntfs_vol = NULL;
 599         }
 600 #endif
 601 }
 602
 603 void
 604 put_image_metadata(struct wim_image_metadata *imd,
 605                    struct wim_lookup_table *table)
 606 {
 607         if (imd && --imd->refcnt == 0) {
 608                 destroy_image_metadata(imd, table, true);
 609                 FREE(imd);
 610         }
 611 }
 612
 613 /* Appends the specified image metadata structure to the array of image metadata
 614  * for a WIM, and increments the image count. */
 615 int
 616 append_image_metadata(WIMStruct *wim, struct wim_image_metadata *imd)
 617 {
 618         struct wim_image_metadata **imd_array;
 619
 620         DEBUG("Reallocating image metadata array for image_count = %u",
 621               wim->hdr.image_count + 1);
 622         imd_array = REALLOC(wim->image_metadata,
 623                             sizeof(wim->image_metadata[0]) * (wim->hdr.image_count + 1));
 624
 625         if (!imd_array)
 626                 return WIMLIB_ERR_NOMEM;
 627         wim->image_metadata = imd_array;
 628         imd_array[wim->hdr.image_count++] = imd;
 629         return 0;
 630 }
 631
 632
 633 struct wim_image_metadata *
 634 new_image_metadata(void)
 635 {
 636         struct wim_image_metadata *imd;
 637
 638         imd = CALLOC(1, sizeof(*imd));
 639         if (imd) {
 640                 imd->refcnt = 1;
 641                 INIT_LIST_HEAD(&imd->inode_list);
 642                 INIT_LIST_HEAD(&imd->unhashed_streams);
 643                 DEBUG("Created new image metadata (refcnt=1)");
 644         } else {
 645                 ERROR_WITH_ERRNO("Failed to allocate new image metadata structure");
 646         }
 647         return imd;
 648 }
 649
 650 struct wim_image_metadata **
 651 new_image_metadata_array(unsigned num_images)
 652 {
 653         struct wim_image_metadata **imd_array;
 654
 655         DEBUG("Creating new image metadata array for %u images",
 656               num_images);
 657
 658         imd_array = CALLOC(num_images, sizeof(imd_array[0]));
 659
 660         if (!imd_array) {
 661                 ERROR("Failed to allocate memory for %u image metadata structures",
 662                       num_images);
 663                 return NULL;
 664         }
 665         for (unsigned i = 0; i < num_images; i++) {
 666                 imd_array[i] = new_image_metadata();
 667                 if (!imd_array[i]) {
 668                         for (unsigned j = 0; j < i; j++)
 669                                 put_image_metadata(imd_array[j], NULL);
 670                         FREE(imd_array);
 671                         return NULL;
 672                 }
 673         }
 674         return imd_array;
 675 }
 676
 677 /* Checksum all streams that are unhashed (other than the metadata streams),
 678  * merging them into the lookup table as needed.  This is a no-op unless the
 679  * library has previously used to add or mount an image using the same
 680  * WIMStruct. */
 681 int
 682 wim_checksum_unhashed_streams(WIMStruct *wim)
 683 {
 684         int ret;
 685         for (int i = 0; i < wim->hdr.image_count; i++) {
 686                 struct wim_lookup_table_entry *lte, *tmp;
 687                 struct wim_image_metadata *imd = wim->image_metadata[i];
 688                 image_for_each_unhashed_stream_safe(lte, tmp, imd) {
 689                         ret = hash_unhashed_stream(lte, wim->lookup_table, NULL);
 690                         if (ret)
 691                                 return ret;
 692                 }
 693         }
 694         return 0;
 695 }
 696
 697 /*
 698  * can_modify_wim - Check if a given WIM is writeable.  This is only the case if
 699  * it meets the following three conditions:
 700  *
 701  * 1. Write access is allowed to the underlying file (if any) at the filesystem level.
 702  * 2. The WIM is not part of a spanned set.
 703  * 3. The WIM_HDR_FLAG_READONLY flag is not set in the WIM header.
 704  *
 705  * Return value is 0 if writable; WIMLIB_ERR_WIM_IS_READONLY otherwise.
 706  */
 707 int
 708 can_modify_wim(WIMStruct *wim)
 709 {
 710         if (wim->filename) {
 711                 if (taccess(wim->filename, W_OK)) {
 712                         ERROR_WITH_ERRNO("Can't modify \"%"TS"\"", wim->filename);
 713                         return WIMLIB_ERR_WIM_IS_READONLY;
 714                 }
 715         }
 716         if (wim->hdr.total_parts != 1) {
 717                 ERROR("Cannot modify \"%"TS"\": is part of a spanned set",
 718                       wim->filename);
 719                 return WIMLIB_ERR_WIM_IS_READONLY;
 720         }
 721         if (wim->hdr.flags & WIM_HDR_FLAG_READONLY) {
 722                 ERROR("Cannot modify \"%"TS"\": is marked read-only",
 723                       wim->filename);
 724                 return WIMLIB_ERR_WIM_IS_READONLY;
 725         }
 726         return 0;
 727 }
 728
 729 /*
 730  * can_delete_from_wim - Check if files or images can be deleted from a given
 731  * WIM file.
 732  *
 733  * This theoretically should be exactly the same as can_modify_wim(), but
 734  * unfortunately, due to bugs in Microsoft's software that generate incorrect
 735  * reference counts for some WIM resources, we need to run expensive
 736  * verifications to make sure the reference counts are correct on all WIM
 737  * resources.  Otherwise we might delete a WIM resource whose reference count
 738  * has fallen to 0, but is actually still referenced somewhere.
 739  */
 740 int
 741 can_delete_from_wim(WIMStruct *wim)
 742 {
 743         int ret;
 744
 745         ret = can_modify_wim(wim);
 746         if (ret)
 747                 return ret;
 748         if (!wim->refcnts_ok)
 749                 wim_recalculate_refcnts(wim);
 750         return 0;
 751 }
 752
 753 /* API function documented in wimlib.h  */
 754 WIMLIBAPI void
 755 wimlib_free(WIMStruct *wim)
 756 {
 757         if (!wim)
 758                 return;
 759
 760         DEBUG("Freeing WIMStruct (filename=\"%"TS"\", image_count=%u)",
 761               wim->filename, wim->hdr.image_count);
 762
 763         while (!list_empty(&wim->subwims)) {
 764                 WIMStruct *subwim;
 765
 766                 subwim = list_entry(wim->subwims.next, WIMStruct, subwim_node);
 767                 list_del(&subwim->subwim_node);
 768                 DEBUG("Freeing subwim.");
 769                 wimlib_free(subwim);
 770         }
 771
 772         if (filedes_valid(&wim->in_fd))
 773                 filedes_close(&wim->in_fd);
 774         if (filedes_valid(&wim->out_fd))
 775                 filedes_close(&wim->out_fd);
 776
 777
 778         free_lookup_table(wim->lookup_table);
 779
 780         FREE(wim->filename);
 781         free_wim_info(wim->wim_info);
 782         if (wim->image_metadata) {
 783                 for (unsigned i = 0; i < wim->hdr.image_count; i++)
 784                         put_image_metadata(wim->image_metadata[i], NULL);
 785                 FREE(wim->image_metadata);
 786         }
 787         FREE(wim);
 788 }
 789
 790 static bool
 791 test_locale_ctype_utf8(void)
 792 {
 793 #ifdef __WIN32__
 794         return false;
 795 #else
 796         char *ctype = nl_langinfo(CODESET);
 797
 798         return (!strstr(ctype, "UTF-8") ||
 799                 !strstr(ctype, "UTF8") ||
 800                 !strstr(ctype, "utf8") ||
 801                 !strstr(ctype, "utf-8"));
 802 #endif
 803 }
 804
 805 /* API function documented in wimlib.h  */
 806 WIMLIBAPI int
 807 wimlib_global_init(int init_flags)
 808 {
 809         static bool already_inited = false;
 810         int ret;
 811
 812         if (already_inited)
 813                 return 0;
 814         libxml_global_init();
 815         if (!(init_flags & WIMLIB_INIT_FLAG_ASSUME_UTF8)) {
 816                 wimlib_mbs_is_utf8 = test_locale_ctype_utf8();
 817         #ifdef WITH_NTFS_3G
 818                 if (!wimlib_mbs_is_utf8)
 819                         libntfs3g_global_init();
 820         #endif
 821         }
 822 #ifdef __WIN32__
 823         ret = win32_global_init(init_flags);
 824         if (ret)
 825                 return ret;
 826 #else
 827         ret = 0;
 828 #endif
 829         already_inited = true;
 830         return ret;
 831 }
 832
 833 /* API function documented in wimlib.h  */
 834 WIMLIBAPI void
 835 wimlib_global_cleanup(void)
 836 {
 837         libxml_global_cleanup();
 838         iconv_global_cleanup();
 839 #ifdef __WIN32__
 840         win32_global_cleanup();
 841 #endif
 842 }