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   1 /*
   2  * wim.c
   3  *
   4  *
   5  * Copyright (C) 2010 Carl Thijssen
   6  * Copyright (C) 2012 Eric Biggers
   7  *
   8  * wimlib - Library for working with WIM files
   9  *
  10  * This library is free software; you can redistribute it and/or modify it under
  11  * the terms of the GNU Lesser General Public License as published by the Free
  12  * Software Foundation; either version 2.1 of the License, or (at your option) any
  13  * later version.
  14  *
  15  * This library 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 A
  17  * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License along
  20  * with this library; if not, write to the Free Software Foundation, Inc., 59
  21  * Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #include "wimlib_internal.h"
  25 #include "io.h"
  26 #include "lookup_table.h"
  27 #include "xml.h"
  28 #include <stdlib.h>
  29
  30 static int print_metadata(WIMStruct *w)
  31 {
  32 #if 0
  33         print_security_data(wim_security_data(w));
  34 #endif
  35         return for_dentry_in_tree(wim_root_dentry(w), print_dentry,
  36                                   w->lookup_table);
  37 }
  38
  39
  40 static int print_files(WIMStruct *w)
  41 {
  42         return for_dentry_in_tree(wim_root_dentry(w), print_dentry_full_path,
  43                                   NULL);
  44 }
  45
  46 static WIMStruct *new_wim_struct()
  47 {
  48         WIMStruct *w;
  49
  50         w = CALLOC(1, sizeof(WIMStruct));
  51         if (!w)
  52                 return NULL;
  53         w->link_type      = WIM_LINK_TYPE_HARD;
  54         w->current_image  = WIM_NO_IMAGE;
  55         return w;
  56 }
  57
  58 /*
  59  * Calls a function on images in the WIM.  If @image is WIM_ALL_IMAGES, @visitor
  60  * is called on the WIM once for each image, with each image selected as the
  61  * current image in turn.  If @image is a certain image, @visitor is called on
  62  * the WIM only once, with that image selected.
  63  */
  64 int for_image(WIMStruct *w, int image, int (*visitor)(WIMStruct *))
  65 {
  66         int ret;
  67         int i;
  68         int image_count;
  69
  70         DEBUG("for_image(w = %p, image = %d, visitor = %p)\n",
  71                                 w, image, visitor);
  72
  73         if (image == WIM_ALL_IMAGES) {
  74                 image_count = w->hdr.image_count;
  75                 for (i = 1; i <= image_count; i++) {
  76                         ret = wimlib_select_image(w, i);
  77                         if (ret != 0)
  78                                 return ret;
  79                         ret = visitor(w);
  80                         if (ret != 0)
  81                                 return ret;
  82                 }
  83         } else {
  84                 ret = wimlib_select_image(w, image);
  85                 if (ret != 0)
  86                         return ret;
  87                 ret = visitor(w);
  88         }
  89         return ret;
  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->lookup_table_entry->resource_entry.offset;
  97         u64 offset2 = bmd2->lookup_table_entry->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.
 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                 if (w->current_image == w->hdr.image_count) {
 117                         ERROR("Expected only %u images, but found more!\n",
 118                                         w->hdr.image_count);
 119                         return WIMLIB_ERR_IMAGE_COUNT;
 120                 } else {
 121                         DEBUG("Found metadata resource for image %u at "
 122                                 "offset %"PRIu64"\n", w->current_image + 1,
 123                                 lte->resource_entry.offset);
 124                         w->image_metadata[
 125                                 w->current_image++].lookup_table_entry = lte;
 126                 }
 127         }
 128
 129         /* Do nothing if not a metadata resource. */
 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 int wim_resource_compression_type(const WIMStruct *w,
 149                                   const struct resource_entry *entry)
 150 {
 151         int wim_ctype = wimlib_get_compression_type(w);
 152         return resource_compression_type(wim_ctype, entry->flags);
 153 }
 154
 155 WIMLIBAPI void wimlib_set_verbose(WIMStruct *w, bool verbose)
 156 {
 157         w->verbose = verbose;
 158 }
 159
 160 /*
 161  * Creates a WIMStruct for a new WIM file.
 162  */
 163 WIMLIBAPI int wimlib_create_new_wim(int ctype, WIMStruct **w_ret)
 164 {
 165         WIMStruct *w;
 166         struct lookup_table *table;
 167         int ret;
 168
 169         DEBUG("Creating new WIM with %s compression\n",
 170                         wimlib_get_compression_type_string(ctype));
 171
 172         /* Allocate the WIMStruct. */
 173         w = new_wim_struct();
 174         if (!w)
 175                 return WIMLIB_ERR_NOMEM;
 176
 177         ret = init_header(&w->hdr, ctype);
 178         if (ret != 0)
 179                 goto err;
 180
 181         table = new_lookup_table(9001);
 182         if (!table) {
 183                 ret = WIMLIB_ERR_NOMEM;
 184                 goto err;
 185         }
 186         w->lookup_table = table;
 187         *w_ret = w;
 188         return 0;
 189 err:
 190         FREE(w);
 191         return ret;
 192 }
 193
 194 WIMLIBAPI int wimlib_get_num_images(const WIMStruct *w)
 195 {
 196         return w->hdr.image_count;
 197 }
 198
 199 int wimlib_select_image(WIMStruct *w, int image)
 200 {
 201         DEBUG("Selecting image %u\n", image);
 202
 203         if (image == w->current_image)
 204                 return 0;
 205
 206         if (image > w->hdr.image_count || image < 1) {
 207                 ERROR("Cannot select image %u: There are only %u images!\n",
 208                                 image, w->hdr.image_count);
 209                 return WIMLIB_ERR_INVALID_IMAGE;
 210         }
 211
 212
 213         /* If a valid image is selected, it can be freed if it is not modified.
 214          * */
 215         if (w->current_image != WIM_NO_IMAGE &&
 216                                 !wim_current_image_is_modified(w)) {
 217
 218                 struct image_metadata *imd;
 219
 220                 DEBUG("Freeing image %u\n", w->current_image);
 221                 imd = wim_get_current_image_metadata(w);
 222                 free_dentry_tree(imd->root_dentry, NULL, false);
 223 #if 0
 224                 destroy_security_data(&imd->security_data);
 225 #endif
 226                 imd->root_dentry = NULL;
 227         }
 228
 229         w->current_image = image;
 230
 231         if (wim_root_dentry(w))
 232                 return 0;
 233         else
 234                 return read_metadata_resource(w->fp,
 235                                 wim_metadata_resource_entry(w),
 236                                 wimlib_get_compression_type(w),
 237                                 /*wim_security_data(w), */
 238                                 wim_root_dentry_p(w));
 239 }
 240
 241
 242 /* Returns the compression type of the WIM file. */
 243 WIMLIBAPI int wimlib_get_compression_type(const WIMStruct *w)
 244 {
 245         return wim_hdr_flags_compression_type(w->hdr.flags);
 246 }
 247
 248 WIMLIBAPI const char *wimlib_get_compression_type_string(int ctype)
 249 {
 250         switch (ctype) {
 251                 case WIM_COMPRESSION_TYPE_NONE:
 252                         return "None";
 253                 case WIM_COMPRESSION_TYPE_LZX:
 254                         return "LZX";
 255                 case WIM_COMPRESSION_TYPE_XPRESS:
 256                         return "XPRESS";
 257                 default:
 258                         return "Invalid";
 259         }
 260 }
 261
 262 /*
 263  * Returns the number of an image in the WIM file, given a string that is either
 264  * the number of the image, or the name of the image.  The images are numbered
 265  * starting at 1.
 266  */
 267 WIMLIBAPI int wimlib_resolve_image(WIMStruct *w, const char *image_name_or_num)
 268 {
 269         char *p;
 270         int image;
 271         int i;
 272
 273         if (!image_name_or_num)
 274                 return WIM_NO_IMAGE;
 275
 276         if (strcmp(image_name_or_num, "all") == 0)
 277                 return WIM_ALL_IMAGES;
 278         image = strtoul(image_name_or_num, &p, 10);
 279         if (*p == '\0') {
 280                 if (image < 1 || image > w->hdr.image_count)
 281                         return WIM_NO_IMAGE;
 282                 return image;
 283         } else {
 284                 for (i = 1; i <= w->hdr.image_count; i++) {
 285                         if (strcmp(image_name_or_num,
 286                                         wimlib_get_image_name(w, i)) == 0)
 287                                 return i;
 288                 }
 289                 return WIM_NO_IMAGE;
 290         }
 291 }
 292
 293
 294 /* Prints some basic information about a WIM file. */
 295 WIMLIBAPI void wimlib_print_wim_information(const WIMStruct *w)
 296 {
 297         const struct wim_header *hdr;
 298
 299         hdr = &w->hdr;
 300         puts("WIM Information:");
 301         puts("----------------");
 302         printf("Path:           %s\n", w->filename);
 303         fputs ("GUID:           0x", stdout);
 304         print_byte_field(hdr->guid, WIM_GID_LEN);
 305         putchar('\n');
 306         printf("Image Count:    %d\n", hdr->image_count);
 307         printf("Compression:    %s\n", wimlib_get_compression_type_string(
 308                                                 wimlib_get_compression_type(w)));
 309         printf("Part Number:    %d/%d\n", 1, 1);
 310         printf("Boot Index:     %d\n", hdr->boot_idx);
 311         printf("Size:           %"PRIu64" bytes\n",
 312                                 wim_info_get_total_bytes(w->wim_info));
 313         printf("Integrity Info: %s\n", (w->hdr.integrity.size != 0) ? "yes" : "no");
 314         putchar('\n');
 315 }
 316
 317 WIMLIBAPI bool wimlib_has_integrity_table(const WIMStruct *w)
 318 {
 319         return w->hdr.integrity.size != 0;
 320 }
 321
 322
 323 WIMLIBAPI void wimlib_print_available_images(const WIMStruct *w, int image)
 324 {
 325         if (image == WIM_ALL_IMAGES) {
 326                 puts("Available Images:");
 327                 puts("-----------------");
 328         } else {
 329                 int n;
 330                 int i;
 331
 332                 n = printf("Information for Image %d\n", image);
 333                 for (i = 0; i < n - 1; i++)
 334                         putchar('-');
 335                 putchar('\n');
 336
 337         }
 338         print_image_info(w->wim_info, image);
 339 }
 340
 341
 342 /* Prints the metadata for the specified image, which may be WIM_ALL_IMAGES, but
 343  * not WIM_NO_IMAGE. */
 344 WIMLIBAPI int wimlib_print_metadata(WIMStruct *w, int image)
 345 {
 346         return for_image(w, image, print_metadata);
 347 }
 348
 349 WIMLIBAPI int wimlib_print_files(WIMStruct *w, int image)
 350 {
 351         return for_image(w, image, print_files);
 352 }
 353
 354 /* Sets the index of the bootable image. */
 355 WIMLIBAPI int wimlib_set_boot_idx(WIMStruct *w, int boot_idx)
 356 {
 357         if (boot_idx < 0 || boot_idx > w->hdr.image_count)
 358                 return WIMLIB_ERR_INVALID_IMAGE;
 359         w->hdr.boot_idx = boot_idx;
 360         if (boot_idx == 0) {
 361                 memset(&w->hdr.boot_metadata_res_entry, 0,
 362                        sizeof(struct resource_entry));
 363         } else {
 364                 memcpy(&w->hdr.boot_metadata_res_entry,
 365                        &w->image_metadata[boot_idx - 1].lookup_table_entry->
 366                                                         resource_entry,
 367                        sizeof(struct resource_entry));
 368         }
 369         return 0;
 370 }
 371
 372 WIMLIBAPI int wimlib_get_boot_idx(const WIMStruct *w)
 373 {
 374         return w->hdr.boot_idx;
 375 }
 376
 377 /*
 378  * Begins the reading of a WIM file; opens the file and reads its header and
 379  * lookup table, and optionally checks the integrity.
 380  */
 381 static int wim_begin_read(WIMStruct *w, const char *in_wim_path, int flags)
 382 {
 383         int ret;
 384         uint xml_num_images;
 385         int integrity_status;
 386
 387         DEBUG("Reading the WIM file `%s'\n", in_wim_path);
 388
 389         w->filename = STRDUP(in_wim_path);
 390         if (!w->filename) {
 391                 ERROR("Failed to allocate memory for WIM filename.\n");
 392                 return WIMLIB_ERR_NOMEM;
 393         }
 394
 395         w->fp = fopen(in_wim_path, "rb");
 396
 397         if (!w->fp) {
 398                 ERROR("Failed to open the file \"%s\" for reading: %m\n",
 399                                 in_wim_path);
 400                 ret = WIMLIB_ERR_OPEN;
 401                 goto done;
 402         }
 403
 404         ret = read_header(w->fp, &w->hdr);
 405         if (ret != 0)
 406                 goto done;
 407
 408         DEBUG("Wim file contains %u images\n", w->hdr.image_count);
 409
 410         /* If the boot index is invalid, print a warning and set it to 0 */
 411         if (w->hdr.boot_idx > w->hdr.image_count) {
 412                 WARNING("In `%s', image %u is marked as bootable,\n"
 413                         "\tbut there are only %u images!\n",
 414                          in_wim_path, w->hdr.boot_idx, w->hdr.image_count);
 415                 w->hdr.boot_idx = 0;
 416         }
 417
 418         if (wimlib_get_compression_type(w) == WIM_COMPRESSION_TYPE_INVALID) {
 419                 ERROR("Invalid compression type (WIM header flags "
 420                                 "= %x)\n", w->hdr.flags);
 421                 ret = WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
 422                 goto done;
 423         }
 424
 425
 426         if (flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY) {
 427                 ret = check_wim_integrity(w,
 428                                           flags & WIMLIB_OPEN_FLAG_SHOW_PROGRESS,
 429                                           &integrity_status);
 430                 if (ret != 0) {
 431                         ERROR("Error in check_wim_integrity()\n");
 432                         goto done;
 433                 }
 434                 if (integrity_status == WIM_INTEGRITY_NONEXISTENT) {
 435                         WARNING("No integrity information; skipping "
 436                                         "integrity check.\n");
 437                 } else if (integrity_status == WIM_INTEGRITY_NOT_OK) {
 438                         ERROR("WIM is not intact! (Failed integrity check)\n");
 439                         ret = WIMLIB_ERR_INTEGRITY;
 440                         goto done;
 441                 }
 442         }
 443
 444         if (resource_is_compressed(&w->hdr.lookup_table_res_entry)) {
 445                 ERROR("Didn't expect a compressed lookup table!\n");
 446                 ERROR("Ask the author to implement support for this.\n");
 447                 ret = WIMLIB_ERR_COMPRESSED_LOOKUP_TABLE;
 448                 goto done;
 449         }
 450
 451         ret = read_lookup_table(w->fp, w->hdr.lookup_table_res_entry.offset,
 452                                 w->hdr.lookup_table_res_entry.size,
 453                                 &w->lookup_table);
 454
 455         if (ret != 0)
 456                 goto done;
 457
 458         w->image_metadata = CALLOC(w->hdr.image_count,
 459                                    sizeof(struct image_metadata));
 460
 461         if (!w->image_metadata) {
 462                 ERROR("Failed to allocate memory for %u metadata structures\n",
 463                                 w->hdr.image_count);
 464                 goto done;
 465         }
 466         w->current_image = 0;
 467
 468         DEBUG("Looking for metadata resources in the lookup table.\n");
 469
 470         /* Find the images in the WIM by searching the lookup table. */
 471         ret = for_lookup_table_entry(w->lookup_table,
 472                                      append_metadata_resource_entry, w);
 473
 474         if (ret != 0)
 475                 goto done;
 476
 477         /* Make sure all the expected images were found.  (We already have
 478          * returned false if *extra* images were found) */
 479         if (w->current_image != w->hdr.image_count) {
 480                 ERROR("Only found %u images in WIM, but expected %u!\n",
 481                                 w->current_image, w->hdr.image_count);
 482                 ret = WIMLIB_ERR_IMAGE_COUNT;
 483                 goto done;
 484         }
 485
 486         w->current_image = WIM_NO_IMAGE;
 487
 488         /* Sort images by the position of their metadata resources.  I'm
 489          * assuming that is what determines the other of the images in the WIM
 490          * file, rather than their order in the lookup table, which may be
 491          * random because of hashing. */
 492         qsort(w->image_metadata, w->hdr.image_count,
 493               sizeof(struct image_metadata), sort_image_metadata_by_position);
 494
 495         /* Read the XML data. */
 496         ret = read_xml_data(w->fp, &w->hdr.xml_res_entry,
 497                             &w->xml_data, &w->wim_info);
 498
 499         if (ret != 0) {
 500                 ERROR("Missing or invalid XML data\n");
 501                 goto done;
 502         }
 503
 504         xml_num_images = wim_info_get_num_images(w->wim_info);
 505         if (xml_num_images != w->hdr.image_count) {
 506                 ERROR("In the file `%s', there are %u <IMAGE> elements "
 507                                 "in the XML data,\n", in_wim_path,
 508                                                         xml_num_images);
 509                 ERROR("but %u images in the WIM!  There must be "
 510                                 "exactly one <IMAGE> element per image.\n",
 511                                 w->hdr.image_count);
 512                 ret = WIMLIB_ERR_IMAGE_COUNT;
 513                 goto done;
 514         }
 515
 516         DEBUG("Done beginning read of WIM file.\n");
 517         ret = 0;
 518 done:
 519         return ret;
 520 }
 521
 522
 523 /*
 524  * Opens a WIM file and creates a WIMStruct for it.
 525  */
 526 WIMLIBAPI int wimlib_open_wim(const char *wim_file, int flags,
 527                               WIMStruct **w_ret)
 528 {
 529         WIMStruct *w;
 530         int ret;
 531
 532         DEBUG("wim_file = `%s', flags = %d\n", wim_file, flags);
 533         w = new_wim_struct();
 534         if (!w)
 535                 return WIMLIB_ERR_NOMEM;
 536
 537         ret = wim_begin_read(w, wim_file, flags);
 538         if (ret != 0) {
 539                 ERROR("Could not begin reading the WIM file `%s'\n", wim_file);
 540                 FREE(w);
 541                 return ret;
 542         }
 543         *w_ret = w;
 544         return 0;
 545 }
 546
 547 /**
 548  * Frees internal memory allocated by WIMLIB for a WIM file, and closes it if it
 549  * is still open.
 550  */
 551 void wimlib_destroy(WIMStruct *w)
 552 {
 553
 554 }
 555
 556 /* Frees the memory for the WIMStruct, including all internal memory; also
 557  * closes all files associated with the WIMStruct.  */
 558 WIMLIBAPI void wimlib_free(WIMStruct *w)
 559 {
 560         uint i;
 561
 562         if (!w)
 563                 return;
 564         if (w->fp)
 565                 fclose(w->fp);
 566         if (w->out_fp)
 567                 fclose(w->out_fp);
 568
 569         free_lookup_table(w->lookup_table);
 570
 571         FREE(w->filename);
 572         FREE(w->output_dir);
 573         FREE(w->xml_data);
 574         free_wim_info(w->wim_info);
 575         if (w->image_metadata) {
 576                 for (i = 0; i < w->hdr.image_count; i++)
 577                         free_dentry_tree(w->image_metadata[i].root_dentry,
 578                                          NULL, false);
 579                 FREE(w->image_metadata);
 580         }
 581         FREE(w);
 582 }
 583