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   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 #include "wimlib/compressor_ops.h"
  42 #include "wimlib/decompressor_ops.h"
  43 #include "wimlib/version.h"
  44
  45 #ifdef __WIN32__
  46 #  include "wimlib/win32.h" /* for realpath() replacement */
  47 #endif
  48
  49 #include <errno.h>
  50 #include <fcntl.h>
  51 #ifndef __WIN32__
  52 #  include <langinfo.h>
  53 #endif
  54 #include <limits.h>
  55 #include <stdarg.h>
  56 #include <stdlib.h>
  57 #include <unistd.h>
  58
  59 static int
  60 wim_default_pack_compression_type(void)
  61 {
  62         return WIMLIB_COMPRESSION_TYPE_LZMS;
  63 }
  64
  65 static u32
  66 wim_default_pack_chunk_size(int ctype) {
  67         switch (ctype) {
  68         case WIMLIB_COMPRESSION_TYPE_LZMS:
  69                 return 1U << 26; /* 67108864  */
  70         default:
  71                 return 1U << 15; /* 32768     */
  72         }
  73 }
  74
  75 static WIMStruct *
  76 new_wim_struct(void)
  77 {
  78         WIMStruct *wim = CALLOC(1, sizeof(WIMStruct));
  79         if (wim) {
  80                 filedes_invalidate(&wim->in_fd);
  81                 filedes_invalidate(&wim->out_fd);
  82                 wim->out_pack_compression_type = wim_default_pack_compression_type();
  83                 wim->out_pack_chunk_size = wim_default_pack_chunk_size(
  84                                                 wim->out_pack_compression_type);
  85                 INIT_LIST_HEAD(&wim->subwims);
  86         }
  87         return wim;
  88 }
  89
  90 /* Determine if the chunk size is valid for the specified compression type.  */
  91 static bool
  92 wim_chunk_size_valid(u32 chunk_size, int ctype)
  93 {
  94         u32 order;
  95
  96         /* Chunk size is meaningless for uncompressed WIMs --- any value is
  97          * okay.  */
  98         if (ctype == WIMLIB_COMPRESSION_TYPE_NONE)
  99                 return true;
 100
 101         /* Chunk size must be power of 2.  */
 102         if (chunk_size == 0)
 103                 return false;
 104         order = bsr32(chunk_size);
 105         if (chunk_size != 1U << order)
 106                 return false;
 107
 108         /* Order        Size
 109          * =====        ====
 110          * 15           32768
 111          * 16           65536
 112          * 17           131072
 113          * 18           262144
 114          * 19           524288
 115          * 20           1048576
 116          * 21           2097152
 117          * 22           4194304
 118          * 23           8388608
 119          * 24           16777216
 120          * 25           33554432
 121          * 26           67108864
 122          */
 123
 124         /* See the documentation for the --chunk-size option of `wimlib-imagex
 125          * capture' for information about allowed chunk sizes.  */
 126         switch (ctype) {
 127         case WIMLIB_COMPRESSION_TYPE_LZX:
 128                 return order >= 15 && order <= 21;
 129
 130         case WIMLIB_COMPRESSION_TYPE_XPRESS:
 131                 return order >= 12 && order <= 26;
 132         case WIMLIB_COMPRESSION_TYPE_LZMS:
 133                 return order >= 15 && order <= 30;
 134         }
 135         return false;
 136 }
 137
 138 /* Return the default chunk size to use for the specified compression type.
 139  *
 140  * See notes above in wim_chunk_size_valid().  */
 141 static u32
 142 wim_default_chunk_size(int ctype)
 143 {
 144         switch (ctype) {
 145         case WIMLIB_COMPRESSION_TYPE_LZMS:
 146                 return 1U << 17; /* 131072  */
 147         default:
 148                 return 1U << 15; /* 32768   */
 149         }
 150 }
 151
 152 /*
 153  * Calls a function on images in the WIM.  If @image is WIMLIB_ALL_IMAGES,
 154  * @visitor is called on the WIM once for each image, with each image selected
 155  * as the current image in turn.  If @image is a certain image, @visitor is
 156  * called on the WIM only once, with that image selected.
 157  */
 158 int
 159 for_image(WIMStruct *wim, int image, int (*visitor)(WIMStruct *))
 160 {
 161         int ret;
 162         int start;
 163         int end;
 164         int i;
 165
 166         if (image == WIMLIB_ALL_IMAGES) {
 167                 start = 1;
 168                 end = wim->hdr.image_count;
 169         } else if (image >= 1 && image <= wim->hdr.image_count) {
 170                 start = image;
 171                 end = image;
 172         } else {
 173                 return WIMLIB_ERR_INVALID_IMAGE;
 174         }
 175         for (i = start; i <= end; i++) {
 176                 ret = select_wim_image(wim, i);
 177                 if (ret != 0)
 178                         return ret;
 179                 ret = visitor(wim);
 180                 if (ret != 0)
 181                         return ret;
 182         }
 183         return 0;
 184 }
 185
 186 /* API function documented in wimlib.h  */
 187 WIMLIBAPI int
 188 wimlib_create_new_wim(int ctype, WIMStruct **wim_ret)
 189 {
 190         WIMStruct *wim;
 191         struct wim_lookup_table *table;
 192         int ret;
 193
 194         wimlib_global_init(WIMLIB_INIT_FLAG_ASSUME_UTF8);
 195
 196         DEBUG("Creating new WIM with %"TS" compression.",
 197               wimlib_get_compression_type_string(ctype));
 198
 199         /* Allocate the WIMStruct. */
 200         wim = new_wim_struct();
 201         if (wim == NULL)
 202                 return WIMLIB_ERR_NOMEM;
 203
 204         ret = init_wim_header(&wim->hdr, ctype, wim_default_chunk_size(ctype));
 205         if (ret)
 206                 goto out_free;
 207
 208         table = new_lookup_table(9001);
 209         if (table == NULL) {
 210                 ret = WIMLIB_ERR_NOMEM;
 211                 goto out_free;
 212         }
 213         wim->lookup_table = table;
 214         wim->refcnts_ok = 1;
 215         wim->compression_type = ctype;
 216         wim->out_compression_type = ctype;
 217         wim->chunk_size = wim->hdr.chunk_size;
 218         wim->out_chunk_size = wim->hdr.chunk_size;
 219         *wim_ret = wim;
 220         return 0;
 221 out_free:
 222         FREE(wim);
 223         return ret;
 224 }
 225
 226 static void
 227 destroy_image_metadata(struct wim_image_metadata *imd,
 228                        struct wim_lookup_table *table,
 229                        bool free_metadata_lte)
 230 {
 231         free_dentry_tree(imd->root_dentry, table);
 232         imd->root_dentry = NULL;
 233         free_wim_security_data(imd->security_data);
 234         imd->security_data = NULL;
 235
 236         if (free_metadata_lte) {
 237                 free_lookup_table_entry(imd->metadata_lte);
 238                 imd->metadata_lte = NULL;
 239         }
 240         if (table == NULL) {
 241                 struct wim_lookup_table_entry *lte, *tmp;
 242                 list_for_each_entry_safe(lte, tmp, &imd->unhashed_streams, unhashed_list)
 243                         free_lookup_table_entry(lte);
 244         }
 245         INIT_LIST_HEAD(&imd->unhashed_streams);
 246         INIT_LIST_HEAD(&imd->inode_list);
 247 #ifdef WITH_NTFS_3G
 248         if (imd->ntfs_vol) {
 249                 do_ntfs_umount(imd->ntfs_vol);
 250                 imd->ntfs_vol = NULL;
 251         }
 252 #endif
 253 }
 254
 255 void
 256 put_image_metadata(struct wim_image_metadata *imd,
 257                    struct wim_lookup_table *table)
 258 {
 259         if (imd && --imd->refcnt == 0) {
 260                 destroy_image_metadata(imd, table, true);
 261                 FREE(imd);
 262         }
 263 }
 264
 265 /* Appends the specified image metadata structure to the array of image metadata
 266  * for a WIM, and increments the image count. */
 267 int
 268 append_image_metadata(WIMStruct *wim, struct wim_image_metadata *imd)
 269 {
 270         struct wim_image_metadata **imd_array;
 271
 272         DEBUG("Reallocating image metadata array for image_count = %u",
 273               wim->hdr.image_count + 1);
 274         imd_array = REALLOC(wim->image_metadata,
 275                             sizeof(wim->image_metadata[0]) * (wim->hdr.image_count + 1));
 276
 277         if (imd_array == NULL)
 278                 return WIMLIB_ERR_NOMEM;
 279         wim->image_metadata = imd_array;
 280         imd_array[wim->hdr.image_count++] = imd;
 281         return 0;
 282 }
 283
 284 struct wim_image_metadata *
 285 new_image_metadata(void)
 286 {
 287         struct wim_image_metadata *imd;
 288
 289         imd = CALLOC(1, sizeof(*imd));
 290         if (imd) {
 291                 imd->refcnt = 1;
 292                 INIT_LIST_HEAD(&imd->inode_list);
 293                 INIT_LIST_HEAD(&imd->unhashed_streams);
 294                 DEBUG("Created new image metadata (refcnt=1)");
 295         } else {
 296                 ERROR_WITH_ERRNO("Failed to allocate new image metadata structure");
 297         }
 298         return imd;
 299 }
 300
 301 static struct wim_image_metadata **
 302 new_image_metadata_array(unsigned num_images)
 303 {
 304         struct wim_image_metadata **imd_array;
 305
 306         DEBUG("Creating new image metadata array for %u images",
 307               num_images);
 308
 309         imd_array = CALLOC(num_images, sizeof(imd_array[0]));
 310
 311         if (imd_array == NULL) {
 312                 ERROR("Failed to allocate memory for %u image metadata structures",
 313                       num_images);
 314                 return NULL;
 315         }
 316         for (unsigned i = 0; i < num_images; i++) {
 317                 imd_array[i] = new_image_metadata();
 318                 if (imd_array[i] == NULL) {
 319                         for (unsigned j = 0; j < i; j++)
 320                                 put_image_metadata(imd_array[j], NULL);
 321                         FREE(imd_array);
 322                         return NULL;
 323                 }
 324         }
 325         return imd_array;
 326 }
 327
 328
 329 /*
 330  * Load the metadata for the specified WIM image into memory and set it
 331  * as the WIMStruct's currently selected image.
 332  *
 333  * @wim
 334  *      The WIMStruct for the WIM.
 335  * @image
 336  *      The 1-based index of the image in the WIM to select.
 337  *
 338  * On success, 0 will be returned, wim->current_image will be set to
 339  * @image, and wim_get_current_image_metadata() can be used to retrieve
 340  * metadata information for the image.
 341  *
 342  * On failure, WIMLIB_ERR_INVALID_IMAGE, WIMLIB_ERR_METADATA_NOT_FOUND,
 343  * or another error code will be returned.
 344  */
 345 int
 346 select_wim_image(WIMStruct *wim, int image)
 347 {
 348         struct wim_image_metadata *imd;
 349         int ret;
 350
 351         DEBUG("Selecting image %d", image);
 352
 353         if (image == WIMLIB_NO_IMAGE) {
 354                 ERROR("Invalid image: %d", WIMLIB_NO_IMAGE);
 355                 return WIMLIB_ERR_INVALID_IMAGE;
 356         }
 357
 358         if (image == wim->current_image)
 359                 return 0;
 360
 361         if (image < 1 || image > wim->hdr.image_count) {
 362                 ERROR("Cannot select image %d: There are only %u images",
 363                       image, wim->hdr.image_count);
 364                 return WIMLIB_ERR_INVALID_IMAGE;
 365         }
 366
 367         if (!wim_has_metadata(wim)) {
 368                 ERROR("\"%"TS"\" does not contain metadata resources!", wim->filename);
 369                 if (wim->hdr.part_number != 1)
 370                         ERROR("Specify the first part of the split WIM instead.");
 371                 return WIMLIB_ERR_METADATA_NOT_FOUND;
 372         }
 373
 374         /* If a valid image is currently selected, its metadata can be freed if
 375          * it has not been modified.  */
 376         if (wim->current_image != WIMLIB_NO_IMAGE) {
 377                 imd = wim_get_current_image_metadata(wim);
 378                 if (!imd->modified) {
 379                         wimlib_assert(list_empty(&imd->unhashed_streams));
 380                         DEBUG("Freeing image %u", wim->current_image);
 381                         destroy_image_metadata(imd, NULL, false);
 382                 }
 383         }
 384         wim->current_image = image;
 385         imd = wim_get_current_image_metadata(wim);
 386         if (imd->root_dentry || imd->modified) {
 387                 ret = 0;
 388         } else {
 389                 ret = read_metadata_resource(wim, imd);
 390                 if (ret)
 391                         wim->current_image = WIMLIB_NO_IMAGE;
 392         }
 393         return ret;
 394 }
 395
 396
 397 /* API function documented in wimlib.h  */
 398 WIMLIBAPI const tchar *
 399 wimlib_get_compression_type_string(int ctype)
 400 {
 401         switch (ctype) {
 402                 case WIMLIB_COMPRESSION_TYPE_NONE:
 403                         return T("None");
 404                 case WIMLIB_COMPRESSION_TYPE_LZX:
 405                         return T("LZX");
 406                 case WIMLIB_COMPRESSION_TYPE_XPRESS:
 407                         return T("XPRESS");
 408                 case WIMLIB_COMPRESSION_TYPE_LZMS:
 409                         return T("LZMS");
 410                 default:
 411                         return T("Invalid");
 412         }
 413 }
 414
 415 /* API function documented in wimlib.h  */
 416 WIMLIBAPI int
 417 wimlib_resolve_image(WIMStruct *wim, const tchar *image_name_or_num)
 418 {
 419         tchar *p;
 420         long image;
 421         int i;
 422
 423         if (!image_name_or_num || !*image_name_or_num)
 424                 return WIMLIB_NO_IMAGE;
 425
 426         if (!tstrcasecmp(image_name_or_num, T("all"))
 427             || !tstrcasecmp(image_name_or_num, T("*")))
 428                 return WIMLIB_ALL_IMAGES;
 429         image = tstrtol(image_name_or_num, &p, 10);
 430         if (p != image_name_or_num && *p == T('\0') && image > 0) {
 431                 if (image > wim->hdr.image_count)
 432                         return WIMLIB_NO_IMAGE;
 433                 return image;
 434         } else {
 435                 for (i = 1; i <= wim->hdr.image_count; i++) {
 436                         if (!tstrcmp(image_name_or_num,
 437                                      wimlib_get_image_name(wim, i)))
 438                                 return i;
 439                 }
 440                 return WIMLIB_NO_IMAGE;
 441         }
 442 }
 443
 444 /* API function documented in wimlib.h  */
 445 WIMLIBAPI void
 446 wimlib_print_available_images(const WIMStruct *wim, int image)
 447 {
 448         int first;
 449         int last;
 450         int i;
 451         int n;
 452         if (image == WIMLIB_ALL_IMAGES) {
 453                 n = tprintf(T("Available Images:\n"));
 454                 first = 1;
 455                 last = wim->hdr.image_count;
 456         } else if (image >= 1 && image <= wim->hdr.image_count) {
 457                 n = tprintf(T("Information for Image %d\n"), image);
 458                 first = image;
 459                 last = image;
 460         } else {
 461                 tprintf(T("wimlib_print_available_images(): Invalid image %d"),
 462                         image);
 463                 return;
 464         }
 465         for (i = 0; i < n - 1; i++)
 466                 tputchar(T('-'));
 467         tputchar(T('\n'));
 468         for (i = first; i <= last; i++)
 469                 print_image_info(wim->wim_info, i);
 470 }
 471
 472 /* API function documented in wimlib.h  */
 473 WIMLIBAPI int
 474 wimlib_get_wim_info(WIMStruct *wim, struct wimlib_wim_info *info)
 475 {
 476         memset(info, 0, sizeof(struct wimlib_wim_info));
 477         memcpy(info->guid, wim->hdr.guid, WIMLIB_GUID_LEN);
 478         info->image_count = wim->hdr.image_count;
 479         info->boot_index = wim->hdr.boot_idx;
 480         info->wim_version = wim->hdr.wim_version;
 481         info->chunk_size = wim->chunk_size;
 482         info->part_number = wim->hdr.part_number;
 483         info->total_parts = wim->hdr.total_parts;
 484         info->compression_type = wim->compression_type;
 485         info->total_bytes = wim_info_get_total_bytes(wim->wim_info);
 486         info->has_integrity_table = wim_has_integrity_table(wim);
 487         info->opened_from_file = (wim->filename != NULL);
 488         info->is_readonly = (wim->hdr.flags & WIM_HDR_FLAG_READONLY) ||
 489                              (wim->hdr.total_parts != 1) ||
 490                              (wim->filename && taccess(wim->filename, W_OK));
 491         info->has_rpfix = (wim->hdr.flags & WIM_HDR_FLAG_RP_FIX) != 0;
 492         info->is_marked_readonly = (wim->hdr.flags & WIM_HDR_FLAG_READONLY) != 0;
 493         info->write_in_progress = (wim->hdr.flags & WIM_HDR_FLAG_WRITE_IN_PROGRESS) != 0;
 494         info->metadata_only = (wim->hdr.flags & WIM_HDR_FLAG_METADATA_ONLY) != 0;
 495         info->resource_only = (wim->hdr.flags & WIM_HDR_FLAG_RESOURCE_ONLY) != 0;
 496         info->spanned = (wim->hdr.flags & WIM_HDR_FLAG_SPANNED) != 0;
 497         info->pipable = wim_is_pipable(wim);
 498         return 0;
 499 }
 500
 501 /* API function documented in wimlib.h  */
 502 WIMLIBAPI int
 503 wimlib_set_wim_info(WIMStruct *wim, const struct wimlib_wim_info *info, int which)
 504 {
 505         int ret;
 506
 507         if (which & ~(WIMLIB_CHANGE_READONLY_FLAG |
 508                       WIMLIB_CHANGE_GUID |
 509                       WIMLIB_CHANGE_BOOT_INDEX |
 510                       WIMLIB_CHANGE_RPFIX_FLAG))
 511                 return WIMLIB_ERR_INVALID_PARAM;
 512
 513         if (which & WIMLIB_CHANGE_READONLY_FLAG) {
 514                 if (info->is_marked_readonly)
 515                         wim->hdr.flags |= WIM_HDR_FLAG_READONLY;
 516                 else
 517                         wim->hdr.flags &= ~WIM_HDR_FLAG_READONLY;
 518         }
 519
 520         if ((which & ~WIMLIB_CHANGE_READONLY_FLAG) == 0)
 521                 return 0;
 522
 523         ret = can_modify_wim(wim);
 524         if (ret)
 525                 return ret;
 526
 527         if (which & WIMLIB_CHANGE_GUID)
 528                 memcpy(wim->hdr.guid, info->guid, WIM_GUID_LEN);
 529
 530         if (which & WIMLIB_CHANGE_BOOT_INDEX) {
 531                 if (info->boot_index > wim->hdr.image_count) {
 532                         ERROR("%u is not 0 or a valid image in the WIM to mark as bootable",
 533                               info->boot_index);
 534                         return WIMLIB_ERR_INVALID_IMAGE;
 535                 }
 536                 wim->hdr.boot_idx = info->boot_index;
 537         }
 538
 539         if (which & WIMLIB_CHANGE_RPFIX_FLAG) {
 540                 if (info->has_rpfix)
 541                         wim->hdr.flags |= WIM_HDR_FLAG_RP_FIX;
 542                 else
 543                         wim->hdr.flags &= ~WIM_HDR_FLAG_RP_FIX;
 544         }
 545         return 0;
 546 }
 547
 548 static int
 549 set_out_ctype(int ctype, u8 *out_ctype_p)
 550 {
 551         switch (ctype) {
 552         case WIMLIB_COMPRESSION_TYPE_NONE:
 553         case WIMLIB_COMPRESSION_TYPE_LZX:
 554         case WIMLIB_COMPRESSION_TYPE_XPRESS:
 555         case WIMLIB_COMPRESSION_TYPE_LZMS:
 556                 *out_ctype_p = ctype;
 557                 return 0;
 558         }
 559         return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
 560 }
 561
 562 /* API function documented in wimlib.h  */
 563 WIMLIBAPI int
 564 wimlib_set_output_compression_type(WIMStruct *wim, int ctype)
 565 {
 566         int ret = set_out_ctype(ctype, &wim->out_compression_type);
 567         if (ret)
 568                 return ret;
 569
 570         /* Reset the chunk size if it's no longer valid.  */
 571         if (!wim_chunk_size_valid(wim->out_chunk_size, ctype))
 572                 wim->out_chunk_size = wim_default_chunk_size(ctype);
 573         return 0;
 574 }
 575
 576 /* API function documented in wimlib.h  */
 577 WIMLIBAPI int
 578 wimlib_set_output_pack_compression_type(WIMStruct *wim, int ctype)
 579 {
 580         int ret = set_out_ctype(ctype, &wim->out_pack_compression_type);
 581         if (ret)
 582                 return ret;
 583
 584         /* Reset the chunk size if it's no longer valid.  */
 585         if (!wim_chunk_size_valid(wim->out_pack_chunk_size, ctype))
 586                 wim->out_pack_chunk_size = wim_default_pack_chunk_size(ctype);
 587         return 0;
 588 }
 589
 590 static int
 591 set_out_chunk_size(u32 chunk_size, int ctype, u32 *out_chunk_size_p)
 592 {
 593         if (!wim_chunk_size_valid(chunk_size, ctype)) {
 594                 ERROR("Invalid chunk size (%"PRIu32" bytes) "
 595                       "for compression type %"TS"!",
 596                       chunk_size,
 597                       wimlib_get_compression_type_string(ctype));
 598                 return WIMLIB_ERR_INVALID_CHUNK_SIZE;
 599         }
 600
 601         *out_chunk_size_p = chunk_size;
 602         return 0;
 603 }
 604
 605 /* API function documented in wimlib.h  */
 606 WIMLIBAPI int
 607 wimlib_set_output_chunk_size(WIMStruct *wim, uint32_t chunk_size)
 608 {
 609         if (chunk_size == 0) {
 610                 wim->out_chunk_size =
 611                         wim_default_chunk_size(wim->out_compression_type);
 612                 return 0;
 613         }
 614
 615         return set_out_chunk_size(chunk_size,
 616                                   wim->out_compression_type,
 617                                   &wim->out_chunk_size);
 618 }
 619
 620 /* API function documented in wimlib.h  */
 621 WIMLIBAPI int
 622 wimlib_set_output_pack_chunk_size(WIMStruct *wim, uint32_t chunk_size)
 623 {
 624         if (chunk_size == 0) {
 625                 wim->out_pack_chunk_size =
 626                         wim_default_pack_chunk_size(wim->out_pack_compression_type);
 627                 return 0;
 628         }
 629
 630         return set_out_chunk_size(chunk_size,
 631                                   wim->out_pack_compression_type,
 632                                   &wim->out_pack_chunk_size);
 633 }
 634
 635 WIMLIBAPI void
 636 wimlib_register_progress_function(WIMStruct *wim,
 637                                   wimlib_progress_func_t progfunc,
 638                                   void *progctx)
 639 {
 640         wim->progfunc = progfunc;
 641         wim->progctx = progctx;
 642 }
 643
 644 static int
 645 open_wim_file(const tchar *filename, struct filedes *fd_ret)
 646 {
 647         int raw_fd;
 648
 649         raw_fd = topen(filename, O_RDONLY | O_BINARY);
 650         if (raw_fd < 0) {
 651                 ERROR_WITH_ERRNO("Can't open \"%"TS"\" read-only", filename);
 652                 return WIMLIB_ERR_OPEN;
 653         }
 654         filedes_init(fd_ret, raw_fd);
 655         return 0;
 656 }
 657
 658 /*
 659  * Begins the reading of a WIM file; opens the file and reads its header and
 660  * lookup table, and optionally checks the integrity.
 661  */
 662 static int
 663 begin_read(WIMStruct *wim, const void *wim_filename_or_fd, int open_flags)
 664 {
 665         int ret;
 666         int xml_num_images;
 667         const tchar *wimfile;
 668
 669         if (open_flags & WIMLIB_OPEN_FLAG_FROM_PIPE) {
 670                 wimfile = NULL;
 671                 filedes_init(&wim->in_fd, *(const int*)wim_filename_or_fd);
 672                 wim->in_fd.is_pipe = 1;
 673         } else {
 674                 wimfile = wim_filename_or_fd;
 675                 ret = open_wim_file(wimfile, &wim->in_fd);
 676                 if (ret)
 677                         return ret;
 678
 679                 /* The absolute path to the WIM is requested so that
 680                  * wimlib_overwrite() still works even if the process changes
 681                  * its working directory.  This actually happens if a WIM is
 682                  * mounted read-write, since the FUSE thread changes directory
 683                  * to "/", and it needs to be able to find the WIM file again.
 684                  *
 685                  * This will break if the full path to the WIM changes in the
 686                  * intervening time...
 687                  *
 688                  * Warning: in Windows native builds, realpath() calls the
 689                  * replacement function in win32_replacements.c.
 690                  */
 691                 wim->filename = realpath(wimfile, NULL);
 692                 if (wim->filename == NULL) {
 693                         ERROR_WITH_ERRNO("Failed to resolve WIM filename");
 694                         if (errno == ENOMEM)
 695                                 return WIMLIB_ERR_NOMEM;
 696                         else
 697                                 return WIMLIB_ERR_OPEN;
 698                 }
 699         }
 700
 701         ret = read_wim_header(wim, &wim->hdr);
 702         if (ret)
 703                 return ret;
 704
 705         if (wim->hdr.flags & WIM_HDR_FLAG_WRITE_IN_PROGRESS) {
 706                 WARNING("The WIM_HDR_FLAG_WRITE_IN_PROGRESS flag is set in the header of\n"
 707                         "          \"%"TS"\".  It may be being changed by another process,\n"
 708                         "          or a process may have crashed while writing the WIM.",
 709                         wimfile);
 710         }
 711
 712         if (open_flags & WIMLIB_OPEN_FLAG_WRITE_ACCESS) {
 713                 ret = can_modify_wim(wim);
 714                 if (ret)
 715                         return ret;
 716         }
 717
 718         if ((open_flags & WIMLIB_OPEN_FLAG_ERROR_IF_SPLIT) &&
 719             (wim->hdr.total_parts != 1))
 720                 return WIMLIB_ERR_IS_SPLIT_WIM;
 721
 722         DEBUG("According to header, WIM contains %u images", wim->hdr.image_count);
 723
 724         /* If the boot index is invalid, print a warning and set it to 0 */
 725         if (wim->hdr.boot_idx > wim->hdr.image_count) {
 726                 WARNING("In `%"TS"', image %u is marked as bootable, "
 727                         "but there are only %u images in the WIM",
 728                         wimfile, wim->hdr.boot_idx, wim->hdr.image_count);
 729                 wim->hdr.boot_idx = 0;
 730         }
 731
 732         /* Check and cache the compression type */
 733         if (wim->hdr.flags & WIM_HDR_FLAG_COMPRESSION) {
 734                 if (wim->hdr.flags & WIM_HDR_FLAG_COMPRESS_LZX) {
 735                         wim->compression_type = WIMLIB_COMPRESSION_TYPE_LZX;
 736                 } else if (wim->hdr.flags & (WIM_HDR_FLAG_COMPRESS_XPRESS |
 737                                              WIM_HDR_FLAG_COMPRESS_XPRESS_2)) {
 738                         wim->compression_type = WIMLIB_COMPRESSION_TYPE_XPRESS;
 739                 } else if (wim->hdr.flags & WIM_HDR_FLAG_COMPRESS_LZMS) {
 740                         wim->compression_type = WIMLIB_COMPRESSION_TYPE_LZMS;
 741                 } else {
 742                         ERROR("The compression flag is set on \"%"TS"\", but "
 743                               "a flag for a recognized format is not",
 744                               wimfile);
 745                         return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
 746                 }
 747         } else {
 748                 wim->compression_type = WIMLIB_COMPRESSION_TYPE_NONE;
 749         }
 750         wim->out_compression_type = wim->compression_type;
 751
 752         /* Check and cache the chunk size.  */
 753         wim->chunk_size = wim->hdr.chunk_size;
 754         wim->out_chunk_size = wim->chunk_size;
 755         if (!wim_chunk_size_valid(wim->chunk_size, wim->compression_type)) {
 756                 ERROR("Invalid chunk size (%"PRIu32" bytes) "
 757                       "for compression type %"TS"!",
 758                       wim->chunk_size,
 759                       wimlib_get_compression_type_string(wim->compression_type));
 760                 return WIMLIB_ERR_INVALID_CHUNK_SIZE;
 761         }
 762
 763         if (open_flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY) {
 764                 ret = check_wim_integrity(wim);
 765                 if (ret == WIM_INTEGRITY_NONEXISTENT) {
 766                         WARNING("No integrity information for `%"TS"'; skipping "
 767                                 "integrity check.", wimfile);
 768                 } else if (ret == WIM_INTEGRITY_NOT_OK) {
 769                         ERROR("WIM is not intact! (Failed integrity check)");
 770                         return WIMLIB_ERR_INTEGRITY;
 771                 } else if (ret != WIM_INTEGRITY_OK) {
 772                         return ret;
 773                 }
 774         }
 775
 776         if (wim->hdr.image_count != 0 && wim->hdr.part_number == 1) {
 777                 wim->image_metadata = new_image_metadata_array(wim->hdr.image_count);
 778                 if (wim->image_metadata == NULL)
 779                         return WIMLIB_ERR_NOMEM;
 780         }
 781
 782         if (open_flags & WIMLIB_OPEN_FLAG_FROM_PIPE) {
 783                 wim->lookup_table = new_lookup_table(9001);
 784                 if (wim->lookup_table == NULL)
 785                         return WIMLIB_ERR_NOMEM;
 786         } else {
 787
 788                 ret = read_wim_xml_data(wim);
 789                 if (ret)
 790                         return ret;
 791
 792                 xml_num_images = wim_info_get_num_images(wim->wim_info);
 793                 if (xml_num_images != wim->hdr.image_count) {
 794                         ERROR("In the file `%"TS"', there are %u <IMAGE> elements "
 795                               "in the XML data,", wimfile, xml_num_images);
 796                         ERROR("but %u images in the WIM!  There must be exactly one "
 797                               "<IMAGE> element per image.", wim->hdr.image_count);
 798                         return WIMLIB_ERR_IMAGE_COUNT;
 799                 }
 800
 801                 ret = read_wim_lookup_table(wim);
 802                 if (ret)
 803                         return ret;
 804
 805                 DEBUG("Done beginning read of WIM file `%"TS"'.", wimfile);
 806         }
 807         return 0;
 808 }
 809
 810 int
 811 open_wim_as_WIMStruct(const void *wim_filename_or_fd, int open_flags,
 812                       WIMStruct **wim_ret,
 813                       wimlib_progress_func_t progfunc, void *progctx)
 814 {
 815         WIMStruct *wim;
 816         int ret;
 817
 818         if (open_flags & WIMLIB_OPEN_FLAG_FROM_PIPE)
 819                 DEBUG("Opening pipable WIM from file descriptor %d.", *(const int*)wim_filename_or_fd);
 820         else
 821                 DEBUG("Opening WIM file \"%"TS"\"", (const tchar*)wim_filename_or_fd);
 822
 823         wimlib_global_init(WIMLIB_INIT_FLAG_ASSUME_UTF8);
 824
 825         if (wim_ret == NULL)
 826                 return WIMLIB_ERR_INVALID_PARAM;
 827
 828         wim = new_wim_struct();
 829         if (wim == NULL)
 830                 return WIMLIB_ERR_NOMEM;
 831
 832         wim->progfunc = progfunc;
 833         wim->progctx = progctx;
 834
 835         ret = begin_read(wim, wim_filename_or_fd, open_flags);
 836         if (ret) {
 837                 wimlib_free(wim);
 838                 return ret;
 839         }
 840
 841         DEBUG("Successfully opened WIM and created WIMStruct.");
 842         *wim_ret = wim;
 843         return 0;
 844 }
 845
 846 /* API function documented in wimlib.h  */
 847 WIMLIBAPI int
 848 wimlib_open_wim_with_progress(const tchar *wimfile, int open_flags,
 849                               WIMStruct **wim_ret,
 850                               wimlib_progress_func_t progfunc, void *progctx)
 851 {
 852         if (open_flags & ~(WIMLIB_OPEN_FLAG_CHECK_INTEGRITY |
 853                            WIMLIB_OPEN_FLAG_ERROR_IF_SPLIT |
 854                            WIMLIB_OPEN_FLAG_WRITE_ACCESS))
 855                 return WIMLIB_ERR_INVALID_PARAM;
 856
 857         return open_wim_as_WIMStruct(wimfile, open_flags, wim_ret,
 858                                      progfunc, progctx);
 859 }
 860
 861 /* API function documented in wimlib.h  */
 862 WIMLIBAPI int
 863 wimlib_open_wim(const tchar *wimfile, int open_flags, WIMStruct **wim_ret)
 864 {
 865         return wimlib_open_wim_with_progress(wimfile, open_flags, wim_ret,
 866                                              NULL, NULL);
 867 }
 868
 869 /* Checksum all streams that are unhashed (other than the metadata streams),
 870  * merging them into the lookup table as needed.  This is a no-op unless the
 871  * library has previously used to add or mount an image using the same
 872  * WIMStruct. */
 873 int
 874 wim_checksum_unhashed_streams(WIMStruct *wim)
 875 {
 876         int ret;
 877
 878         if (!wim_has_metadata(wim))
 879                 return 0;
 880         for (int i = 0; i < wim->hdr.image_count; i++) {
 881                 struct wim_lookup_table_entry *lte, *tmp;
 882                 struct wim_image_metadata *imd = wim->image_metadata[i];
 883                 image_for_each_unhashed_stream_safe(lte, tmp, imd) {
 884                         struct wim_lookup_table_entry *new_lte;
 885                         ret = hash_unhashed_stream(lte, wim->lookup_table, &new_lte);
 886                         if (ret)
 887                                 return ret;
 888                         if (new_lte != lte)
 889                                 free_lookup_table_entry(lte);
 890                 }
 891         }
 892         return 0;
 893 }
 894
 895 /*
 896  * can_modify_wim - Check if a given WIM is writeable.  This is only the case if
 897  * it meets the following three conditions:
 898  *
 899  * 1. Write access is allowed to the underlying file (if any) at the filesystem level.
 900  * 2. The WIM is not part of a spanned set.
 901  * 3. The WIM_HDR_FLAG_READONLY flag is not set in the WIM header.
 902  *
 903  * Return value is 0 if writable; WIMLIB_ERR_WIM_IS_READONLY otherwise.
 904  */
 905 int
 906 can_modify_wim(WIMStruct *wim)
 907 {
 908         if (wim->filename) {
 909                 if (taccess(wim->filename, W_OK)) {
 910                         ERROR_WITH_ERRNO("Can't modify \"%"TS"\"", wim->filename);
 911                         return WIMLIB_ERR_WIM_IS_READONLY;
 912                 }
 913         }
 914         if (wim->hdr.total_parts != 1) {
 915                 ERROR("Cannot modify \"%"TS"\": is part of a split WIM",
 916                       wim->filename);
 917                 return WIMLIB_ERR_WIM_IS_READONLY;
 918         }
 919         if (wim->hdr.flags & WIM_HDR_FLAG_READONLY) {
 920                 ERROR("Cannot modify \"%"TS"\": is marked read-only",
 921                       wim->filename);
 922                 return WIMLIB_ERR_WIM_IS_READONLY;
 923         }
 924         return 0;
 925 }
 926
 927 /*
 928  * can_delete_from_wim - Check if files or images can be deleted from a given
 929  * WIM file.
 930  *
 931  * This theoretically should be exactly the same as can_modify_wim(), but
 932  * unfortunately, due to bugs in Microsoft's software that generate incorrect
 933  * reference counts for some WIM resources, we need to run expensive
 934  * verifications to make sure the reference counts are correct on all WIM
 935  * resources.  Otherwise we might delete a WIM resource whose reference count
 936  * has fallen to 0, but is actually still referenced somewhere.
 937  */
 938 int
 939 can_delete_from_wim(WIMStruct *wim)
 940 {
 941         int ret;
 942
 943         ret = can_modify_wim(wim);
 944         if (ret)
 945                 return ret;
 946         if (!wim->refcnts_ok) {
 947                 ret = wim_recalculate_refcnts(wim);
 948                 if (ret)
 949                         return ret;
 950         }
 951         return 0;
 952 }
 953
 954 /* API function documented in wimlib.h  */
 955 WIMLIBAPI void
 956 wimlib_free(WIMStruct *wim)
 957 {
 958         if (wim == NULL)
 959                 return;
 960
 961         DEBUG("Freeing WIMStruct (filename=\"%"TS"\", image_count=%u)",
 962               wim->filename, wim->hdr.image_count);
 963
 964         while (!list_empty(&wim->subwims)) {
 965                 WIMStruct *subwim;
 966
 967                 subwim = list_entry(wim->subwims.next, WIMStruct, subwim_node);
 968                 list_del(&subwim->subwim_node);
 969                 DEBUG("Freeing subwim.");
 970                 wimlib_free(subwim);
 971         }
 972
 973         if (filedes_valid(&wim->in_fd))
 974                 filedes_close(&wim->in_fd);
 975         if (filedes_valid(&wim->out_fd))
 976                 filedes_close(&wim->out_fd);
 977
 978         free_lookup_table(wim->lookup_table);
 979
 980         wimlib_free_decompressor(wim->decompressor);
 981
 982         FREE(wim->filename);
 983         free_wim_info(wim->wim_info);
 984         if (wim->image_metadata) {
 985                 for (unsigned i = 0; i < wim->hdr.image_count; i++)
 986                         put_image_metadata(wim->image_metadata[i], NULL);
 987                 FREE(wim->image_metadata);
 988         }
 989         FREE(wim);
 990 }
 991
 992 static bool
 993 test_locale_ctype_utf8(void)
 994 {
 995 #ifdef __WIN32__
 996         return false;
 997 #else
 998         char *ctype = nl_langinfo(CODESET);
 999
1000         return (!strstr(ctype, "UTF-8") ||
1001                 !strstr(ctype, "UTF8") ||
1002                 !strstr(ctype, "utf8") ||
1003                 !strstr(ctype, "utf-8"));
1004 #endif
1005 }
1006
1007 /* API function documented in wimlib.h  */
1008 WIMLIBAPI u32
1009 wimlib_get_version(void)
1010 {
1011         return WIMLIB_VERSION_CODE;
1012 }
1013
1014 static bool lib_initialized = false;
1015
1016 /* API function documented in wimlib.h  */
1017 WIMLIBAPI int
1018 wimlib_global_init(int init_flags)
1019 {
1020         if (lib_initialized)
1021                 return 0;
1022
1023 #ifdef ENABLE_ERROR_MESSAGES
1024         if (wimlib_error_file == NULL)
1025                 wimlib_error_file = stderr;
1026 #endif
1027
1028         if (init_flags & ~(WIMLIB_INIT_FLAG_ASSUME_UTF8 |
1029                            WIMLIB_INIT_FLAG_DONT_ACQUIRE_PRIVILEGES |
1030                            WIMLIB_INIT_FLAG_STRICT_CAPTURE_PRIVILEGES |
1031                            WIMLIB_INIT_FLAG_STRICT_APPLY_PRIVILEGES |
1032                            WIMLIB_INIT_FLAG_DEFAULT_CASE_SENSITIVE |
1033                            WIMLIB_INIT_FLAG_DEFAULT_CASE_INSENSITIVE))
1034                 return WIMLIB_ERR_INVALID_PARAM;
1035
1036         libxml_global_init();
1037         if (!(init_flags & WIMLIB_INIT_FLAG_ASSUME_UTF8)) {
1038                 wimlib_mbs_is_utf8 = test_locale_ctype_utf8();
1039         #ifdef WITH_NTFS_3G
1040                 if (!wimlib_mbs_is_utf8)
1041                         libntfs3g_global_init();
1042         #endif
1043         }
1044 #ifdef __WIN32__
1045         {
1046                 int ret = win32_global_init(init_flags);
1047                 if (ret)
1048                         return ret;
1049         }
1050 #endif
1051         iconv_global_init();
1052         init_upcase();
1053         if (init_flags & WIMLIB_INIT_FLAG_DEFAULT_CASE_SENSITIVE)
1054                 default_ignore_case = false;
1055         else if (init_flags & WIMLIB_INIT_FLAG_DEFAULT_CASE_INSENSITIVE)
1056                 default_ignore_case = true;
1057         lib_initialized = true;
1058         return 0;
1059 }
1060
1061 /* API function documented in wimlib.h  */
1062 WIMLIBAPI void
1063 wimlib_global_cleanup(void)
1064 {
1065         if (!lib_initialized)
1066                 return;
1067         libxml_global_cleanup();
1068         iconv_global_cleanup();
1069 #ifdef __WIN32__
1070         win32_global_cleanup();
1071 #endif
1072         cleanup_decompressor_params();
1073         cleanup_compressor_params();
1074
1075         wimlib_set_error_file(NULL);
1076         lib_initialized = false;
1077 }