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   1 /*
   2  * wim.c
   3  */
   4
   5 /*
   6  * Copyright (C) 2010 Carl Thijssen
   7  * Copyright (C) 2012 Eric Biggers
   8  *
   9  * wimlib - Library for working with WIM files
  10  *
  11  * This file is part of wimlib, a library for working with WIM files.
  12  *
  13  * wimlib is free software; you can redistribute it and/or modify it under the
  14  * terms of the GNU Lesser General Public License as published by the Free
  15  * Software Foundation; either version 2.1 of the License, or (at your option)
  16  * any later version.
  17  *
  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 Lesser General Public License for more
  21  * details.
  22  *
  23  * You should have received a copy of the GNU Lesser General Public License
  24  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  25  */
  26
  27 #include "wimlib_internal.h"
  28 #include "io.h"
  29 #include "lookup_table.h"
  30 #include "xml.h"
  31 #include <stdlib.h>
  32
  33 #ifdef WITH_NTFS_3G
  34 #include <ntfs-3g/volume.h>
  35 #endif
  36
  37 static int print_metadata(WIMStruct *w)
  38 {
  39         print_security_data(wim_security_data(w));
  40         return for_dentry_in_tree(wim_root_dentry(w), print_dentry,
  41                                   w->lookup_table);
  42 }
  43
  44
  45 static int print_files(WIMStruct *w)
  46 {
  47         return for_dentry_in_tree(wim_root_dentry(w), print_dentry_full_path,
  48                                   NULL);
  49 }
  50
  51 WIMStruct *new_wim_struct()
  52 {
  53         return CALLOC(1, sizeof(WIMStruct));
  54 }
  55
  56 /*
  57  * Calls a function on images in the WIM.  If @image is WIM_ALL_IMAGES, @visitor
  58  * is called on the WIM once for each image, with each image selected as the
  59  * current image in turn.  If @image is a certain image, @visitor is called on
  60  * the WIM only once, with that image selected.
  61  */
  62 int for_image(WIMStruct *w, int image, int (*visitor)(WIMStruct *))
  63 {
  64         int ret;
  65         int i;
  66         int end;
  67
  68         DEBUG("for_image(w = %p, image = %d, visitor = %p)", w, image, visitor);
  69
  70         if (image == WIM_ALL_IMAGES) {
  71                 i = 1;
  72                 end = w->hdr.image_count;
  73         } else {
  74                 if (image < 1 || image > w->hdr.image_count)
  75                         return WIMLIB_ERR_INVALID_IMAGE;
  76                 i = image;
  77                 end = image;
  78         }
  79         for (; i <= end; i++) {
  80                 ret = wimlib_select_image(w, i);
  81                 if (ret != 0)
  82                         return ret;
  83                 ret = visitor(w);
  84                 if (ret != 0)
  85                         return ret;
  86         }
  87         return 0;
  88 }
  89
  90 static int sort_image_metadata_by_position(const void *p1, const void *p2)
  91 {
  92         struct image_metadata *bmd1 = (struct image_metadata*)p1;
  93         struct image_metadata *bmd2 = (struct image_metadata*)p2;
  94         u64 offset1 = bmd1->metadata_lte->resource_entry.offset;
  95         u64 offset2 = bmd2->metadata_lte->resource_entry.offset;
  96         if (offset1 < offset2)
  97                 return -1;
  98         else if (offset1 > offset2)
  99                 return 1;
 100         else
 101                 return 0;
 102 }
 103
 104 /*
 105  * If @lte points to a metadata resource, append it to the list of metadata
 106  * resources in the WIMStruct.  Otherwise, do nothing.
 107  */
 108 static int append_metadata_resource_entry(struct lookup_table_entry *lte,
 109                                           void *wim_p)
 110 {
 111         WIMStruct *w = wim_p;
 112
 113         if (lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA) {
 114                 /*fprintf(stderr, "found mlte at %u\n", lte->resource_entry.offset);*/
 115                 if (w->current_image == w->hdr.image_count) {
 116                         ERROR("Expected only %u images, but found more",
 117                               w->hdr.image_count);
 118                         return WIMLIB_ERR_IMAGE_COUNT;
 119                 } else {
 120                         DEBUG("Found metadata resource for image %u at "
 121                               "offset %"PRIu64".",
 122                               w->current_image + 1,
 123                               lte->resource_entry.offset);
 124                         w->image_metadata[
 125                                 w->current_image++].metadata_lte = lte;
 126                 }
 127         }
 128         return 0;
 129 }
 130
 131 /* Returns the compression type given in the flags of a WIM header. */
 132 int wim_hdr_flags_compression_type(int wim_hdr_flags)
 133 {
 134         if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESSION) {
 135                 if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESS_LZX)
 136                         return WIM_COMPRESSION_TYPE_LZX;
 137                 else if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESS_XPRESS)
 138                         return WIM_COMPRESSION_TYPE_XPRESS;
 139                 else
 140                         return WIM_COMPRESSION_TYPE_INVALID;
 141         } else {
 142                 return WIM_COMPRESSION_TYPE_NONE;
 143         }
 144 }
 145
 146 /*
 147  * Creates a WIMStruct for a new WIM file.
 148  */
 149 WIMLIBAPI int wimlib_create_new_wim(int ctype, WIMStruct **w_ret)
 150 {
 151         WIMStruct *w;
 152         struct lookup_table *table;
 153         int ret;
 154
 155         DEBUG("Creating new WIM with %s compression.",
 156               wimlib_get_compression_type_string(ctype));
 157
 158         /* Allocate the WIMStruct. */
 159         w = new_wim_struct();
 160         if (!w)
 161                 return WIMLIB_ERR_NOMEM;
 162
 163         ret = init_header(&w->hdr, ctype);
 164         if (ret != 0)
 165                 goto out_free;
 166
 167         table = new_lookup_table(9001);
 168         if (!table) {
 169                 ret = WIMLIB_ERR_NOMEM;
 170                 goto out_free;
 171         }
 172         w->lookup_table = table;
 173         *w_ret = w;
 174         return 0;
 175 out_free:
 176         FREE(w);
 177         return ret;
 178 }
 179
 180 WIMLIBAPI int wimlib_get_num_images(const WIMStruct *w)
 181 {
 182         return w->hdr.image_count;
 183 }
 184
 185 int wimlib_select_image(WIMStruct *w, int image)
 186 {
 187         struct image_metadata *imd;
 188
 189         DEBUG("Selecting image %d", image);
 190
 191         if (image == w->current_image)
 192                 return 0;
 193
 194         if (image < 1 || image > w->hdr.image_count) {
 195                 ERROR("Cannot select image %d: There are only %u images",
 196                       image, w->hdr.image_count);
 197                 return WIMLIB_ERR_INVALID_IMAGE;
 198         }
 199
 200
 201         /* If a valid image is currently selected, it can be freed if it is not
 202          * modified.  */
 203         if (w->current_image != WIM_NO_IMAGE) {
 204                 imd = wim_get_current_image_metadata(w);
 205                 if (!imd->modified) {
 206                         DEBUG("Freeing image %u", w->current_image);
 207                         destroy_image_metadata(imd, NULL);
 208                         imd->root_dentry = NULL;
 209                         imd->security_data = NULL;
 210                         imd->lgt = NULL;
 211                 }
 212         }
 213
 214         w->current_image = image;
 215         imd = wim_get_current_image_metadata(w);
 216
 217         if (imd->root_dentry) {
 218                 return 0;
 219         } else {
 220                 #ifdef ENABLE_DEBUG
 221                 DEBUG("Reading metadata resource specified by the following "
 222                       "lookup table entry:");
 223                 print_lookup_table_entry(imd->metadata_lte);
 224                 #endif
 225                 return read_metadata_resource(w->fp,
 226                                               wimlib_get_compression_type(w),
 227                                               imd);
 228         }
 229 }
 230
 231
 232 /* Returns the compression type of the WIM file. */
 233 WIMLIBAPI int wimlib_get_compression_type(const WIMStruct *w)
 234 {
 235         return wim_hdr_flags_compression_type(w->hdr.flags);
 236 }
 237
 238 WIMLIBAPI const char *wimlib_get_compression_type_string(int ctype)
 239 {
 240         switch (ctype) {
 241                 case WIM_COMPRESSION_TYPE_NONE:
 242                         return "None";
 243                 case WIM_COMPRESSION_TYPE_LZX:
 244                         return "LZX";
 245                 case WIM_COMPRESSION_TYPE_XPRESS:
 246                         return "XPRESS";
 247                 default:
 248                         return "Invalid";
 249         }
 250 }
 251
 252 /*
 253  * Returns the number of an image in the WIM file, given a string that is either
 254  * the number of the image, or the name of the image.  The images are numbered
 255  * starting at 1.
 256  */
 257 WIMLIBAPI int wimlib_resolve_image(WIMStruct *w, const char *image_name_or_num)
 258 {
 259         char *p;
 260         int image;
 261         int i;
 262
 263         if (!image_name_or_num)
 264                 return WIM_NO_IMAGE;
 265
 266         if (strcmp(image_name_or_num, "all") == 0)
 267                 return WIM_ALL_IMAGES;
 268         image = strtol(image_name_or_num, &p, 10);
 269         if (p != image_name_or_num && *p == '\0') {
 270                 if (image < 1 || image > w->hdr.image_count)
 271                         return WIM_NO_IMAGE;
 272                 return image;
 273         } else {
 274                 for (i = 1; i <= w->hdr.image_count; i++) {
 275                         if (strcmp(image_name_or_num,
 276                                    wimlib_get_image_name(w, i)) == 0)
 277                                 return i;
 278                 }
 279                 return WIM_NO_IMAGE;
 280         }
 281 }
 282
 283
 284 /* Prints some basic information about a WIM file. */
 285 WIMLIBAPI void wimlib_print_wim_information(const WIMStruct *w)
 286 {
 287         const struct wim_header *hdr;
 288
 289         hdr = &w->hdr;
 290         puts("WIM Information:");
 291         puts("----------------");
 292         printf("Path:           %s\n", w->filename);
 293         fputs ("GUID:           0x", stdout);
 294         print_byte_field(hdr->guid, WIM_GID_LEN);
 295         putchar('\n');
 296         printf("Image Count:    %d\n", hdr->image_count);
 297         printf("Compression:    %s\n", wimlib_get_compression_type_string(
 298                                                 wimlib_get_compression_type(w)));
 299         printf("Part Number:    %d/%d\n", hdr->part_number, hdr->total_parts);
 300         printf("Boot Index:     %d\n", hdr->boot_idx);
 301         printf("Size:           %"PRIu64" bytes\n",
 302                                 wim_info_get_total_bytes(w->wim_info));
 303         printf("Integrity Info: %s\n", (w->hdr.integrity.size != 0) ? "yes" : "no");
 304         putchar('\n');
 305 }
 306
 307 WIMLIBAPI bool wimlib_has_integrity_table(const WIMStruct *w)
 308 {
 309         return w->hdr.integrity.size != 0;
 310 }
 311
 312 WIMLIBAPI void wimlib_print_available_images(const WIMStruct *w, int image)
 313 {
 314         if (image == WIM_ALL_IMAGES) {
 315                 puts("Available Images:");
 316                 puts("-----------------");
 317         } else {
 318                 int n;
 319                 int i;
 320
 321                 n = printf("Information for Image %d\n", image);
 322                 for (i = 0; i < n - 1; i++)
 323                         putchar('-');
 324                 putchar('\n');
 325
 326         }
 327         print_image_info(w->wim_info, image);
 328 }
 329
 330
 331 /* Prints the metadata for the specified image, which may be WIM_ALL_IMAGES, but
 332  * not WIM_NO_IMAGE. */
 333 WIMLIBAPI int wimlib_print_metadata(WIMStruct *w, int image)
 334 {
 335         return for_image(w, image, print_metadata);
 336 }
 337
 338 WIMLIBAPI int wimlib_print_files(WIMStruct *w, int image)
 339 {
 340         return for_image(w, image, print_files);
 341 }
 342
 343 /* Sets the index of the bootable image. */
 344 WIMLIBAPI int wimlib_set_boot_idx(WIMStruct *w, int boot_idx)
 345 {
 346         if (boot_idx < 0 || boot_idx > w->hdr.image_count)
 347                 return WIMLIB_ERR_INVALID_IMAGE;
 348         w->hdr.boot_idx = boot_idx;
 349         if (boot_idx == 0) {
 350                 memset(&w->hdr.boot_metadata_res_entry, 0,
 351                        sizeof(struct resource_entry));
 352         } else {
 353                 memcpy(&w->hdr.boot_metadata_res_entry,
 354                        &w->image_metadata[
 355                                 boot_idx - 1].metadata_lte->resource_entry,
 356                        sizeof(struct resource_entry));
 357         }
 358         return 0;
 359 }
 360
 361 WIMLIBAPI int wimlib_get_part_number(const WIMStruct *w, int *total_parts_ret)
 362 {
 363         if (total_parts_ret)
 364                 *total_parts_ret = w->hdr.total_parts;
 365         return w->hdr.part_number;
 366 }
 367
 368
 369 WIMLIBAPI int wimlib_get_boot_idx(const WIMStruct *w)
 370 {
 371         return w->hdr.boot_idx;
 372 }
 373
 374 /*
 375  * Begins the reading of a WIM file; opens the file and reads its header and
 376  * lookup table, and optionally checks the integrity.
 377  */
 378 static int begin_read(WIMStruct *w, const char *in_wim_path, int flags)
 379 {
 380         int ret;
 381         uint xml_num_images;
 382
 383         DEBUG("Reading the WIM file `%s'", in_wim_path);
 384
 385         w->filename = STRDUP(in_wim_path);
 386         if (!w->filename) {
 387                 ERROR("Failed to allocate memory for WIM filename");
 388                 return WIMLIB_ERR_NOMEM;
 389         }
 390
 391         w->fp = fopen(in_wim_path, "rb");
 392
 393         if (!w->fp) {
 394                 ERROR_WITH_ERRNO("Failed to open the file `%s' for reading",
 395                                  in_wim_path);
 396                 return WIMLIB_ERR_OPEN;
 397         }
 398
 399         ret = read_header(w->fp, &w->hdr, flags & WIMLIB_OPEN_FLAG_SPLIT_OK);
 400         if (ret != 0)
 401                 return ret;
 402
 403         DEBUG("Wim file contains %u images", w->hdr.image_count);
 404
 405         /* If the boot index is invalid, print a warning and set it to 0 */
 406         if (w->hdr.boot_idx > w->hdr.image_count) {
 407                 WARNING("In `%s', image %u is marked as bootable, "
 408                         "but there are only %u images",
 409                          in_wim_path, w->hdr.boot_idx, w->hdr.image_count);
 410                 w->hdr.boot_idx = 0;
 411         }
 412
 413         if (wimlib_get_compression_type(w) == WIM_COMPRESSION_TYPE_INVALID) {
 414                 ERROR("Invalid compression type (WIM header flags = %x)",
 415                       w->hdr.flags);
 416                 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
 417         }
 418
 419
 420         if (flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY) {
 421                 int integrity_status;
 422                 ret = check_wim_integrity(w,
 423                                           flags & WIMLIB_OPEN_FLAG_SHOW_PROGRESS,
 424                                           &integrity_status);
 425                 if (ret != 0) {
 426                         ERROR("Error in check_wim_integrity()");
 427                         return ret;
 428                 }
 429                 if (integrity_status == WIM_INTEGRITY_NONEXISTENT) {
 430                         WARNING("No integrity information for `%s'; skipping "
 431                                 "integrity check.", w->filename);
 432                 } else if (integrity_status == WIM_INTEGRITY_NOT_OK) {
 433                         ERROR("WIM is not intact! (Failed integrity check)");
 434                         return WIMLIB_ERR_INTEGRITY;
 435                 }
 436         }
 437
 438         if (resource_is_compressed(&w->hdr.lookup_table_res_entry)) {
 439                 ERROR("Didn't expect a compressed lookup table!");
 440                 ERROR("Ask the author to implement support for this.");
 441                 return WIMLIB_ERR_COMPRESSED_LOOKUP_TABLE;
 442         }
 443
 444         ret = read_lookup_table(w);
 445         if (ret != 0)
 446                 return ret;
 447
 448         w->image_metadata = CALLOC(w->hdr.image_count,
 449                                    sizeof(struct image_metadata));
 450
 451         if (!w->image_metadata) {
 452                 ERROR("Failed to allocate memory for %u metadata structures",
 453                       w->hdr.image_count);
 454                 return WIMLIB_ERR_NOMEM;
 455         }
 456         w->current_image = 0;
 457
 458         DEBUG("Looking for metadata resources in the lookup table.");
 459
 460         /* Find the images in the WIM by searching the lookup table. */
 461         ret = for_lookup_table_entry(w->lookup_table,
 462                                      append_metadata_resource_entry, w);
 463
 464         if (ret != 0)
 465                 return ret;
 466
 467         /* Make sure all the expected images were found.  (We already have
 468          * returned false if *extra* images were found) */
 469         if (w->current_image != w->hdr.image_count && w->hdr.part_number == 1) {
 470                 ERROR("Only found %u images in WIM, but expected %u",
 471                       w->current_image, w->hdr.image_count);
 472                 return WIMLIB_ERR_IMAGE_COUNT;
 473         }
 474
 475
 476         /* Sort images by the position of their metadata resources.  I'm
 477          * assuming that is what determines the other of the images in the WIM
 478          * file, rather than their order in the lookup table, which is random
 479          * because of hashing. */
 480         qsort(w->image_metadata, w->current_image,
 481               sizeof(struct image_metadata), sort_image_metadata_by_position);
 482
 483         w->current_image = WIM_NO_IMAGE;
 484
 485         /* Read the XML data. */
 486         ret = read_xml_data(w->fp, &w->hdr.xml_res_entry,
 487                             &w->xml_data, &w->wim_info);
 488
 489         if (ret != 0) {
 490                 ERROR("Missing or invalid XML data");
 491                 return ret;
 492         }
 493
 494         xml_num_images = wim_info_get_num_images(w->wim_info);
 495         if (xml_num_images != w->hdr.image_count) {
 496                 ERROR("In the file `%s', there are %u <IMAGE> elements "
 497                       "in the XML data,", in_wim_path, xml_num_images);
 498                 ERROR("but %u images in the WIM!  There must be exactly one "
 499                       "<IMAGE> element per image.", w->hdr.image_count);
 500                 return WIMLIB_ERR_IMAGE_COUNT;
 501         }
 502
 503         DEBUG("Done beginning read of WIM file `%s'.", in_wim_path);
 504         return 0;
 505 }
 506
 507
 508 /*
 509  * Opens a WIM file and creates a WIMStruct for it.
 510  */
 511 WIMLIBAPI int wimlib_open_wim(const char *wim_file, int flags,
 512                               WIMStruct **w_ret)
 513 {
 514         WIMStruct *w;
 515         int ret;
 516
 517         DEBUG("wim_file = `%s', flags = %#x", wim_file, flags);
 518         w = new_wim_struct();
 519         if (!w) {
 520                 ERROR("Failed to allocate memory for WIMStruct");
 521                 return WIMLIB_ERR_NOMEM;
 522         }
 523
 524         ret = begin_read(w, wim_file, flags);
 525         if (ret != 0) {
 526                 DEBUG("Could not begin reading the WIM file `%s'", wim_file);
 527                 wimlib_free(w);
 528                 return ret;
 529         }
 530         *w_ret = w;
 531         return 0;
 532 }
 533
 534 /* Frees the memory for the WIMStruct, including all internal memory; also
 535  * closes all files associated with the WIMStruct.  */
 536 WIMLIBAPI void wimlib_free(WIMStruct *w)
 537 {
 538         DEBUG("Freeing WIMStruct");
 539
 540         if (!w)
 541                 return;
 542         if (w->fp)
 543                 fclose(w->fp);
 544         if (w->out_fp)
 545                 fclose(w->out_fp);
 546
 547         free_lookup_table(w->lookup_table);
 548
 549         FREE(w->filename);
 550         FREE(w->xml_data);
 551         free_wim_info(w->wim_info);
 552         if (w->image_metadata) {
 553                 for (uint i = 0; i < w->hdr.image_count; i++)
 554                         destroy_image_metadata(&w->image_metadata[i], NULL);
 555                 FREE(w->image_metadata);
 556         }
 557 #ifdef WITH_NTFS_3G
 558         if (w->ntfs_vol) {
 559                 DEBUG("Unmounting NTFS volume");
 560                 ntfs_umount(w->ntfs_vol, FALSE);
 561         }
 562 #endif
 563         FREE(w);
 564 }
 565