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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 General Public License as published by the Free
  15  * Software Foundation; either version 3 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 General Public License for more
  21  * details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  25  */
  26
  27 #include "config.h"
  28 #include <stdlib.h>
  29 #include <stdarg.h>
  30
  31 #ifdef WITH_NTFS_3G
  32 #include <ntfs-3g/volume.h>
  33 #endif
  34
  35 #include "wimlib_internal.h"
  36 #include "io.h"
  37 #include "lookup_table.h"
  38 #include "xml.h"
  39
  40
  41 static int print_metadata(WIMStruct *w)
  42 {
  43         print_security_data(wim_security_data(w));
  44         return for_dentry_in_tree(wim_root_dentry(w), print_dentry,
  45                                   w->lookup_table);
  46 }
  47
  48
  49 static int print_files(WIMStruct *w)
  50 {
  51         return for_dentry_in_tree(wim_root_dentry(w), print_dentry_full_path,
  52                                   NULL);
  53 }
  54
  55 WIMStruct *new_wim_struct()
  56 {
  57         return CALLOC(1, sizeof(WIMStruct));
  58 }
  59
  60 /*
  61  * Calls a function on images in the WIM.  If @image is WIM_ALL_IMAGES, @visitor
  62  * is called on the WIM once for each image, with each image selected as the
  63  * current image in turn.  If @image is a certain image, @visitor is called on
  64  * the WIM only once, with that image selected.
  65  */
  66 int for_image(WIMStruct *w, int image, int (*visitor)(WIMStruct *))
  67 {
  68         int ret;
  69         int i;
  70         int end;
  71
  72         if (image == WIM_ALL_IMAGES) {
  73                 i = 1;
  74                 end = w->hdr.image_count;
  75         } else {
  76                 if (image < 1 || image > w->hdr.image_count)
  77                         return WIMLIB_ERR_INVALID_IMAGE;
  78                 i = image;
  79                 end = image;
  80         }
  81         for (; i <= end; i++) {
  82                 ret = select_wim_image(w, i);
  83                 if (ret != 0)
  84                         return ret;
  85                 ret = visitor(w);
  86                 if (ret != 0)
  87                         return ret;
  88         }
  89         return 0;
  90 }
  91
  92 static int sort_image_metadata_by_position(const void *p1, const void *p2)
  93 {
  94         struct image_metadata *bmd1 = (struct image_metadata*)p1;
  95         struct image_metadata *bmd2 = (struct image_metadata*)p2;
  96         u64 offset1 = bmd1->metadata_lte->resource_entry.offset;
  97         u64 offset2 = bmd2->metadata_lte->resource_entry.offset;
  98         if (offset1 < offset2)
  99                 return -1;
 100         else if (offset1 > offset2)
 101                 return 1;
 102         else
 103                 return 0;
 104 }
 105
 106 /*
 107  * If @lte points to a metadata resource, append it to the list of metadata
 108  * resources in the WIMStruct.  Otherwise, do nothing.
 109  */
 110 static int append_metadata_resource_entry(struct lookup_table_entry *lte,
 111                                           void *wim_p)
 112 {
 113         WIMStruct *w = wim_p;
 114
 115         if (lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA) {
 116                 /*fprintf(stderr, "found mlte at %u\n", lte->resource_entry.offset);*/
 117                 if (w->current_image == w->hdr.image_count) {
 118                         ERROR("Expected only %u images, but found more",
 119                               w->hdr.image_count);
 120                         return WIMLIB_ERR_IMAGE_COUNT;
 121                 } else {
 122                         DEBUG("Found metadata resource for image %u at "
 123                               "offset %"PRIu64".",
 124                               w->current_image + 1,
 125                               lte->resource_entry.offset);
 126                         w->image_metadata[
 127                                 w->current_image++].metadata_lte = lte;
 128                 }
 129         }
 130         return 0;
 131 }
 132
 133 /* Returns the compression type given in the flags of a WIM header. */
 134 int wim_hdr_flags_compression_type(int wim_hdr_flags)
 135 {
 136         if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESSION) {
 137                 if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESS_LZX)
 138                         return WIM_COMPRESSION_TYPE_LZX;
 139                 else if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESS_XPRESS)
 140                         return WIM_COMPRESSION_TYPE_XPRESS;
 141                 else
 142                         return WIM_COMPRESSION_TYPE_INVALID;
 143         } else {
 144                 return WIM_COMPRESSION_TYPE_NONE;
 145         }
 146 }
 147
 148 /*
 149  * Creates a WIMStruct for a new WIM file.
 150  */
 151 WIMLIBAPI int wimlib_create_new_wim(int ctype, WIMStruct **w_ret)
 152 {
 153         WIMStruct *w;
 154         struct lookup_table *table;
 155         int ret;
 156
 157         DEBUG("Creating new WIM with %s compression.",
 158               wimlib_get_compression_type_string(ctype));
 159
 160         /* Allocate the WIMStruct. */
 161         w = new_wim_struct();
 162         if (!w)
 163                 return WIMLIB_ERR_NOMEM;
 164
 165         ret = init_header(&w->hdr, ctype);
 166         if (ret != 0)
 167                 goto out_free;
 168
 169         table = new_lookup_table(9001);
 170         if (!table) {
 171                 ret = WIMLIB_ERR_NOMEM;
 172                 goto out_free;
 173         }
 174         w->lookup_table = table;
 175         *w_ret = w;
 176         return 0;
 177 out_free:
 178         FREE(w);
 179         return ret;
 180 }
 181
 182 WIMLIBAPI int wimlib_get_num_images(const WIMStruct *w)
 183 {
 184         return w->hdr.image_count;
 185 }
 186
 187 int select_wim_image(WIMStruct *w, int image)
 188 {
 189         struct image_metadata *imd;
 190
 191         DEBUG("Selecting image %d", image);
 192
 193         if (image == w->current_image)
 194                 return 0;
 195
 196         if (image < 1 || image > w->hdr.image_count) {
 197                 ERROR("Cannot select image %d: There are only %u images",
 198                       image, w->hdr.image_count);
 199                 return WIMLIB_ERR_INVALID_IMAGE;
 200         }
 201
 202
 203         /* If a valid image is currently selected, it can be freed if it is not
 204          * modified.  */
 205         if (w->current_image != WIM_NO_IMAGE) {
 206                 imd = wim_get_current_image_metadata(w);
 207                 if (!imd->modified) {
 208                         DEBUG("Freeing image %u", w->current_image);
 209                         destroy_image_metadata(imd, NULL);
 210                         imd->root_dentry = NULL;
 211                         imd->security_data = NULL;
 212                 }
 213         }
 214
 215         w->current_image = image;
 216         imd = wim_get_current_image_metadata(w);
 217
 218         if (imd->root_dentry) {
 219                 return 0;
 220         } else {
 221                 #ifdef ENABLE_DEBUG
 222                 DEBUG("Reading metadata resource specified by the following "
 223                       "lookup table entry:");
 224                 print_lookup_table_entry(imd->metadata_lte);
 225                 #endif
 226                 return read_metadata_resource(w, imd);
 227         }
 228 }
 229
 230
 231 /* Returns the compression type of the WIM file. */
 232 WIMLIBAPI int wimlib_get_compression_type(const WIMStruct *w)
 233 {
 234         return wim_hdr_flags_compression_type(w->hdr.flags);
 235 }
 236
 237 WIMLIBAPI const char *wimlib_get_compression_type_string(int ctype)
 238 {
 239         switch (ctype) {
 240                 case WIM_COMPRESSION_TYPE_NONE:
 241                         return "None";
 242                 case WIM_COMPRESSION_TYPE_LZX:
 243                         return "LZX";
 244                 case WIM_COMPRESSION_TYPE_XPRESS:
 245                         return "XPRESS";
 246                 default:
 247                         return "Invalid";
 248         }
 249 }
 250
 251 /*
 252  * Returns the number of an image in the WIM file, given a string that is either
 253  * the number of the image, or the name of the image.  The images are numbered
 254  * starting at 1.
 255  */
 256 WIMLIBAPI int wimlib_resolve_image(WIMStruct *w, const char *image_name_or_num)
 257 {
 258         char *p;
 259         int image;
 260         int i;
 261
 262         if (!image_name_or_num)
 263                 return WIM_NO_IMAGE;
 264
 265         if (strcmp(image_name_or_num, "all") == 0
 266             || strcmp(image_name_or_num, "*") == 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         if (!w)
 336                 return WIMLIB_ERR_INVALID_PARAM;
 337         if (w->hdr.part_number != 1) {
 338                 ERROR("We cannot show the metadata from part %hu of a %hu-part split WIM.",
 339                        w->hdr.part_number, w->hdr.total_parts);
 340                 ERROR("Select the first part of the split WIM to see the metadata.");
 341                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 342         }
 343         if (image == WIM_ALL_IMAGES)
 344                 DEBUG("Printing metadata for all images");
 345         else
 346                 DEBUG("Printing metadata for image %d", image);
 347         return for_image(w, image, print_metadata);
 348 }
 349
 350 WIMLIBAPI int wimlib_print_files(WIMStruct *w, int image)
 351 {
 352         if (!w)
 353                 return WIMLIB_ERR_INVALID_PARAM;
 354         if (w->hdr.part_number != 1) {
 355                 ERROR("We cannot list the files from part %hu of a %hu-part split WIM",
 356                        w->hdr.part_number, w->hdr.total_parts);
 357                 ERROR("Select the first part of the split WIM if you'd like to list the files.");
 358                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 359         }
 360         return for_image(w, image, print_files);
 361 }
 362
 363 /* Sets the index of the bootable image. */
 364 WIMLIBAPI int wimlib_set_boot_idx(WIMStruct *w, int boot_idx)
 365 {
 366         if (!w)
 367                 return WIMLIB_ERR_INVALID_PARAM;
 368         if (w->hdr.total_parts != 1) {
 369                 ERROR("We cannot modify the boot index of a split WIM");
 370                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 371         }
 372         if (boot_idx < 0 || boot_idx > w->hdr.image_count)
 373                 return WIMLIB_ERR_INVALID_IMAGE;
 374         w->hdr.boot_idx = boot_idx;
 375         if (boot_idx == 0) {
 376                 memset(&w->hdr.boot_metadata_res_entry, 0,
 377                        sizeof(struct resource_entry));
 378         } else {
 379                 memcpy(&w->hdr.boot_metadata_res_entry,
 380                        &w->image_metadata[
 381                                 boot_idx - 1].metadata_lte->resource_entry,
 382                        sizeof(struct resource_entry));
 383         }
 384         return 0;
 385 }
 386
 387 WIMLIBAPI int wimlib_get_part_number(const WIMStruct *w, int *total_parts_ret)
 388 {
 389         if (total_parts_ret)
 390                 *total_parts_ret = w->hdr.total_parts;
 391         return w->hdr.part_number;
 392 }
 393
 394
 395 WIMLIBAPI int wimlib_get_boot_idx(const WIMStruct *w)
 396 {
 397         return w->hdr.boot_idx;
 398 }
 399
 400 /*
 401  * Begins the reading of a WIM file; opens the file and reads its header and
 402  * lookup table, and optionally checks the integrity.
 403  */
 404 static int begin_read(WIMStruct *w, const char *in_wim_path, int flags)
 405 {
 406         int ret;
 407         uint xml_num_images;
 408
 409         DEBUG("Reading the WIM file `%s'", in_wim_path);
 410
 411         w->filename = STRDUP(in_wim_path);
 412         if (!w->filename) {
 413                 ERROR("Failed to allocate memory for WIM filename");
 414                 return WIMLIB_ERR_NOMEM;
 415         }
 416
 417         w->fp = fopen(in_wim_path, "rb");
 418
 419         if (!w->fp) {
 420                 ERROR_WITH_ERRNO("Failed to open the file `%s' for reading",
 421                                  in_wim_path);
 422                 return WIMLIB_ERR_OPEN;
 423         }
 424
 425         ret = read_header(w->fp, &w->hdr, flags & WIMLIB_OPEN_FLAG_SPLIT_OK);
 426         if (ret != 0)
 427                 return ret;
 428
 429         DEBUG("Wim file contains %u images", w->hdr.image_count);
 430
 431         /* If the boot index is invalid, print a warning and set it to 0 */
 432         if (w->hdr.boot_idx > w->hdr.image_count) {
 433                 WARNING("In `%s', image %u is marked as bootable, "
 434                         "but there are only %u images",
 435                          in_wim_path, w->hdr.boot_idx, w->hdr.image_count);
 436                 w->hdr.boot_idx = 0;
 437         }
 438
 439         if (wimlib_get_compression_type(w) == WIM_COMPRESSION_TYPE_INVALID) {
 440                 ERROR("Invalid compression type (WIM header flags = %x)",
 441                       w->hdr.flags);
 442                 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
 443         }
 444
 445
 446         if (flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY) {
 447                 int integrity_status;
 448                 ret = check_wim_integrity(w,
 449                                           flags & WIMLIB_OPEN_FLAG_SHOW_PROGRESS,
 450                                           &integrity_status);
 451                 if (ret != 0) {
 452                         ERROR("Error in check_wim_integrity()");
 453                         return ret;
 454                 }
 455                 if (integrity_status == WIM_INTEGRITY_NONEXISTENT) {
 456                         WARNING("No integrity information for `%s'; skipping "
 457                                 "integrity check.", w->filename);
 458                 } else if (integrity_status == WIM_INTEGRITY_NOT_OK) {
 459                         ERROR("WIM is not intact! (Failed integrity check)");
 460                         return WIMLIB_ERR_INTEGRITY;
 461                 }
 462         }
 463
 464         if (resource_is_compressed(&w->hdr.lookup_table_res_entry)) {
 465                 ERROR("Didn't expect a compressed lookup table!");
 466                 ERROR("Ask the author to implement support for this.");
 467                 return WIMLIB_ERR_COMPRESSED_LOOKUP_TABLE;
 468         }
 469
 470         ret = read_lookup_table(w);
 471         if (ret != 0)
 472                 return ret;
 473
 474         w->image_metadata = CALLOC(w->hdr.image_count,
 475                                    sizeof(struct image_metadata));
 476
 477         if (!w->image_metadata) {
 478                 ERROR("Failed to allocate memory for %u metadata structures",
 479                       w->hdr.image_count);
 480                 return WIMLIB_ERR_NOMEM;
 481         }
 482         w->current_image = 0;
 483
 484         DEBUG("Looking for metadata resources in the lookup table.");
 485
 486         /* Find the images in the WIM by searching the lookup table. */
 487         ret = for_lookup_table_entry(w->lookup_table,
 488                                      append_metadata_resource_entry, w);
 489
 490         if (ret != 0)
 491                 return ret;
 492
 493         /* Make sure all the expected images were found.  (We already have
 494          * returned false if *extra* images were found) */
 495         if (w->current_image != w->hdr.image_count && w->hdr.part_number == 1) {
 496                 ERROR("Only found %u images in WIM, but expected %u",
 497                       w->current_image, w->hdr.image_count);
 498                 return WIMLIB_ERR_IMAGE_COUNT;
 499         }
 500
 501
 502         /* Sort images by the position of their metadata resources.  I'm
 503          * assuming that is what determines the other of the images in the WIM
 504          * file, rather than their order in the lookup table, which is random
 505          * because of hashing. */
 506         qsort(w->image_metadata, w->current_image,
 507               sizeof(struct image_metadata), sort_image_metadata_by_position);
 508
 509         w->current_image = WIM_NO_IMAGE;
 510
 511         /* Read the XML data. */
 512         ret = read_xml_data(w->fp, &w->hdr.xml_res_entry,
 513                             &w->xml_data, &w->wim_info);
 514
 515         if (ret != 0) {
 516                 ERROR("Missing or invalid XML data");
 517                 return ret;
 518         }
 519
 520         xml_num_images = wim_info_get_num_images(w->wim_info);
 521         if (xml_num_images != w->hdr.image_count) {
 522                 ERROR("In the file `%s', there are %u <IMAGE> elements "
 523                       "in the XML data,", in_wim_path, xml_num_images);
 524                 ERROR("but %u images in the WIM!  There must be exactly one "
 525                       "<IMAGE> element per image.", w->hdr.image_count);
 526                 return WIMLIB_ERR_IMAGE_COUNT;
 527         }
 528
 529         DEBUG("Done beginning read of WIM file `%s'.", in_wim_path);
 530         return 0;
 531 }
 532
 533
 534 /*
 535  * Opens a WIM file and creates a WIMStruct for it.
 536  */
 537 WIMLIBAPI int wimlib_open_wim(const char *wim_file, int flags,
 538                               WIMStruct **w_ret)
 539 {
 540         WIMStruct *w;
 541         int ret;
 542
 543         DEBUG("wim_file = `%s', flags = %#x", wim_file, flags);
 544         w = new_wim_struct();
 545         if (!w) {
 546                 ERROR("Failed to allocate memory for WIMStruct");
 547                 return WIMLIB_ERR_NOMEM;
 548         }
 549
 550         ret = begin_read(w, wim_file, flags);
 551         if (ret != 0) {
 552                 DEBUG("Could not begin reading the WIM file `%s'", wim_file);
 553                 wimlib_free(w);
 554                 return ret;
 555         }
 556         *w_ret = w;
 557         return 0;
 558 }
 559
 560 /* Frees the memory for the WIMStruct, including all internal memory; also
 561  * closes all files associated with the WIMStruct.  */
 562 WIMLIBAPI void wimlib_free(WIMStruct *w)
 563 {
 564         DEBUG2("Freeing WIMStruct");
 565
 566         if (!w)
 567                 return;
 568         if (w->fp)
 569                 fclose(w->fp);
 570         if (w->out_fp)
 571                 fclose(w->out_fp);
 572
 573         free_lookup_table(w->lookup_table);
 574
 575         FREE(w->filename);
 576         FREE(w->xml_data);
 577         free_wim_info(w->wim_info);
 578         if (w->image_metadata) {
 579                 for (uint i = 0; i < w->hdr.image_count; i++)
 580                         destroy_image_metadata(&w->image_metadata[i], NULL);
 581                 FREE(w->image_metadata);
 582         }
 583 #ifdef WITH_NTFS_3G
 584         if (w->ntfs_vol) {
 585                 DEBUG("Unmounting NTFS volume");
 586                 ntfs_umount(w->ntfs_vol, FALSE);
 587         }
 588 #endif
 589         FREE(w);
 590 }
 591