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   1 /*
   2  * xml.c
   3  *
   4  * Deals with the XML information in WIM files.  Uses the C library libxml2.
   5  */
   6
   7 /*
   8  * Copyright (C) 2012 Eric Biggers
   9  *
  10  * This file is part of wimlib, a library for working with WIM files.
  11  *
  12  * wimlib is free software; you can redistribute it and/or modify it under the
  13  * terms of the GNU General Public License as published by the Free
  14  * Software Foundation; either version 3 of the License, or (at your option)
  15  * any later version.
  16  *
  17  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  18  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  19  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  24  */
  25
  26 #include "dentry.h"
  27 #include "lookup_table.h"
  28 #include "timestamp.h"
  29 #include "wimlib_internal.h"
  30 #include "xml.h"
  31
  32 #include <string.h>
  33 #include <libxml/parser.h>
  34 #include <libxml/tree.h>
  35 #include <libxml/xmlwriter.h>
  36 #include <libxml/encoding.h>
  37 #include <limits.h>
  38
  39 /* Structures used to form an in-memory representation of the XML data (other
  40  * than the raw parse tree from libxml). */
  41
  42 struct windows_version {
  43         u64 major;
  44         u64 minor;
  45         u64 build;
  46         u64 sp_build;
  47         u64 sp_level;
  48 };
  49
  50 struct windows_info {
  51         u64    arch;
  52         char  *product_name;
  53         char  *edition_id;
  54         char  *installation_type;
  55         char  *hal;
  56         char  *product_type;
  57         char  *product_suite;
  58         char **languages;
  59         char  *default_language;
  60         size_t num_languages;
  61         char  *system_root;
  62         bool   windows_version_exists;
  63         struct windows_version windows_version;
  64 };
  65
  66 struct image_info {
  67         int index;
  68         bool windows_info_exists;
  69         u64 dir_count;
  70         u64 file_count;
  71         u64 total_bytes;
  72         u64 hard_link_bytes;
  73         u64 creation_time;
  74         u64 last_modification_time;
  75         struct windows_info windows_info;
  76         char *name;
  77         char *description;
  78         char *display_name;
  79         char *display_description;
  80         union {
  81                 char *flags;
  82                 struct lookup_table *lookup_table;
  83         };
  84 };
  85
  86
  87 /* Returns a statically allocated string that is a string representation of the
  88  * architecture number. */
  89 static const char *get_arch(int arch)
  90 {
  91         static char buf[20];
  92         switch (arch) {
  93         case 0:
  94                 return "x86";
  95         case 6:
  96                 return "ia64";
  97         case 9:
  98                 return "x86_64";
  99         /* XXX Are there other arch values? */
 100         default:
 101                 snprintf(buf, sizeof(buf), "%d (unknown)", arch);
 102                 return buf;
 103         }
 104 }
 105
 106
 107 /* Iterate through the children of an xmlNode. */
 108 #define for_node_child(parent, child)   \
 109         for (child = parent->children; child != NULL; child = child->next)
 110
 111 /* Utility functions for xmlNodes */
 112 static inline bool node_is_element(xmlNode *node)
 113 {
 114         return node->type == XML_ELEMENT_NODE;
 115 }
 116
 117 static inline bool node_is_text(xmlNode *node)
 118 {
 119         return node->type == XML_TEXT_NODE;
 120 }
 121
 122 static inline bool node_name_is(xmlNode *node, const char *name)
 123 {
 124         /* For now, both upper case and lower case element names are accepted. */
 125         return strcasecmp((const char *)node->name, name) == 0;
 126 }
 127
 128 /* Finds the text node that is a child of an element node and returns its
 129  * content converted to a 64-bit unsigned integer.  Returns 0 if no text node is
 130  * found. */
 131 static u64 node_get_u64(const xmlNode *u64_node)
 132 {
 133         xmlNode *child;
 134         for_node_child(u64_node, child)
 135                 if (node_is_text(child))
 136                         return strtoull((const char *)child->content, NULL, 10);
 137         return 0;
 138 }
 139
 140 /* Like node_get_u64(), but expects a number in base 16. */
 141 static u64 node_get_hex_u64(const xmlNode *u64_node)
 142 {
 143         xmlNode *child;
 144         for_node_child(u64_node, child)
 145                 if (node_is_text(child))
 146                         return strtoull(child->content, NULL, 16);
 147         return 0;
 148 }
 149
 150 static int node_get_string(const xmlNode *string_node, char **str)
 151 {
 152         xmlNode *child;
 153         char *p = NULL;
 154
 155         for_node_child(string_node, child) {
 156                 if (node_is_text(child) && child->content) {
 157                         p = STRDUP(child->content);
 158                         if (!p)
 159                                 return WIMLIB_ERR_NOMEM;
 160                         break;
 161                 }
 162         }
 163         *str = p;
 164         return 0;
 165 }
 166
 167 /* Returns the timestamp from a time node.  It has child elements <HIGHPART> and
 168  * <LOWPART> that are then used to construct a 64-bit timestamp. */
 169 static u64 node_get_timestamp(const xmlNode *time_node)
 170 {
 171         u32 high_part = 0;
 172         u32 low_part = 0;
 173         xmlNode *child;
 174         for_node_child(time_node, child) {
 175                 if (!node_is_element(child))
 176                         continue;
 177                 if (node_name_is(child, "HIGHPART"))
 178                         high_part = node_get_hex_u64(child);
 179                 else if (node_name_is(child, "LOWPART"))
 180                         low_part = node_get_hex_u64(child);
 181         }
 182         return (u64)low_part | ((u64)high_part << 32);
 183 }
 184
 185 /* Used to sort an array of struct image_infos by their image indices. */
 186 static int sort_by_index(const void *p1, const void *p2)
 187 {
 188         int index_1 = ((const struct image_info*)p1)->index;
 189         int index_2 = ((const struct image_info*)p2)->index;
 190         if (index_1 < index_2)
 191                 return -1;
 192         else if (index_1 > index_2)
 193                 return 1;
 194         else
 195                 return 0;
 196 }
 197
 198
 199 /* Frees memory allocated inside a struct windows_info structure. */
 200 static void destroy_windows_info(struct windows_info *windows_info)
 201 {
 202         FREE(windows_info->product_name);
 203         FREE(windows_info->edition_id);
 204         FREE(windows_info->installation_type);
 205         FREE(windows_info->hal);
 206         FREE(windows_info->product_type);
 207         FREE(windows_info->product_suite);
 208         for (size_t i = 0; i < windows_info->num_languages; i++)
 209                 FREE(windows_info->languages[i]);
 210         FREE(windows_info->languages);
 211         FREE(windows_info->default_language);
 212         FREE(windows_info->system_root);
 213 }
 214
 215 /* Frees memory allocated inside a struct image_info structure. */
 216 static void destroy_image_info(struct image_info *image_info)
 217 {
 218         FREE(image_info->name);
 219         FREE(image_info->description);
 220         FREE(image_info->flags);
 221         FREE(image_info->display_name);
 222         FREE(image_info->display_description);
 223         destroy_windows_info(&image_info->windows_info);
 224         memset(image_info, 0, sizeof(struct image_info));
 225 }
 226
 227 void free_wim_info(struct wim_info *info)
 228 {
 229         if (info) {
 230                 if (info->images) {
 231                         for (int i = 0; i < info->num_images; i++)
 232                                 destroy_image_info(&info->images[i]);
 233                         FREE(info->images);
 234                 }
 235                 FREE(info);
 236         }
 237 }
 238
 239 /* Reads the information from a <VERSION> element inside the <WINDOWS> element.
 240  * */
 241 static void xml_read_windows_version(const xmlNode *version_node,
 242                                      struct windows_version* windows_version)
 243 {
 244         xmlNode *child;
 245         for_node_child(version_node, child) {
 246                 if (!node_is_element(child))
 247                         continue;
 248                 if (node_name_is(child, "MAJOR"))
 249                         windows_version->major = node_get_u64(child);
 250                 else if (node_name_is(child, "MINOR"))
 251                         windows_version->minor = node_get_u64(child);
 252                 else if (node_name_is(child, "BUILD"))
 253                         windows_version->build = node_get_u64(child);
 254                 else if (node_name_is(child, "SPBUILD"))
 255                         windows_version->sp_build = node_get_u64(child);
 256                 else if (node_name_is(child, "SPLEVEL"))
 257                         windows_version->sp_level = node_get_u64(child);
 258         }
 259 }
 260
 261 /* Reads the information from a <LANGUAGE> element inside a <WINDOWS> element.
 262  * */
 263 static int xml_read_languages(const xmlNode *languages_node,
 264                               char ***languages_ret,
 265                               size_t *num_languages_ret,
 266                               char **default_language_ret)
 267 {
 268         xmlNode *child;
 269         size_t num_languages = 0;
 270         char **languages;
 271         int ret;
 272
 273         for_node_child(languages_node, child)
 274                 if (node_is_element(child) && node_name_is(child, "LANGUAGE"))
 275                         num_languages++;
 276
 277         languages = CALLOC(num_languages, sizeof(languages[0]));
 278         if (!languages)
 279                 return WIMLIB_ERR_NOMEM;
 280
 281         *languages_ret = languages;
 282         *num_languages_ret = num_languages;
 283
 284         ret = 0;
 285         for_node_child(languages_node, child) {
 286                 if (!node_is_element(child))
 287                         continue;
 288                 if (node_name_is(child, "LANGUAGE"))
 289                         ret = node_get_string(child, languages++);
 290                 else if (node_name_is(child, "DEFAULT"))
 291                         ret = node_get_string(child, default_language_ret);
 292                 if (ret != 0)
 293                         break;
 294         }
 295         return ret;
 296 }
 297
 298 /* Reads the information from a <WINDOWS> element inside an <IMAGE> element. */
 299 static int xml_read_windows_info(const xmlNode *windows_node,
 300                                  struct windows_info *windows_info)
 301 {
 302         xmlNode *child;
 303         int ret = 0;
 304
 305         for_node_child(windows_node, child) {
 306                 if (!node_is_element(child))
 307                         continue;
 308                 if (node_name_is(child, "ARCH")) {
 309                         windows_info->arch = node_get_u64(child);
 310                 } else if (node_name_is(child, "PRODUCTNAME")) {
 311                         ret = node_get_string(child,
 312                                               &windows_info->product_name);
 313                 } else if (node_name_is(child, "EDITIONID")) {
 314                         ret = node_get_string(child,
 315                                               &windows_info->edition_id);
 316                 } else if (node_name_is(child, "INSTALLATIONTYPE")) {
 317                         ret = node_get_string(child,
 318                                               &windows_info->installation_type);
 319                 } else if (node_name_is(child, "PRODUCTTYPE")) {
 320                         ret = node_get_string(child,
 321                                               &windows_info->product_type);
 322                 } else if (node_name_is(child, "PRODUCTSUITE")) {
 323                         ret = node_get_string(child,
 324                                               &windows_info->product_suite);
 325                 } else if (node_name_is(child, "LANGUAGES")) {
 326                         ret = xml_read_languages(child,
 327                                                  &windows_info->languages,
 328                                                  &windows_info->num_languages,
 329                                                  &windows_info->default_language);
 330                 } else if (node_name_is(child, "VERSION")) {
 331                         xml_read_windows_version(child,
 332                                                 &windows_info->windows_version);
 333                         windows_info->windows_version_exists = true;
 334                 } else if (node_name_is(child, "SYSTEMROOT")) {
 335                         ret = node_get_string(child, &windows_info->system_root);
 336                 } else if (node_name_is(child, "HAL")) {
 337                         ret = node_get_string(child, &windows_info->hal);
 338                 }
 339                 if (ret != 0)
 340                         return ret;
 341         }
 342         return ret;
 343 }
 344
 345 /* Reads the information from an <IMAGE> element. */
 346 static int xml_read_image_info(xmlNode *image_node,
 347                                struct image_info *image_info)
 348 {
 349         xmlNode *child;
 350         xmlChar *index_prop;
 351         int ret;
 352
 353         index_prop = xmlGetProp(image_node, "INDEX");
 354         if (index_prop) {
 355                 image_info->index = atoi(index_prop);
 356                 FREE(index_prop);
 357         } else {
 358                 image_info->index = 1;
 359         }
 360
 361         ret = 0;
 362         for_node_child(image_node, child) {
 363                 if (!node_is_element(child))
 364                         continue;
 365                 if (node_name_is(child, "DIRCOUNT"))
 366                         image_info->dir_count = node_get_u64(child);
 367                 else if (node_name_is(child, "FILECOUNT"))
 368                         image_info->file_count = node_get_u64(child);
 369                 else if (node_name_is(child, "TOTALBYTES"))
 370                         image_info->total_bytes = node_get_u64(child);
 371                 else if (node_name_is(child, "HARDLINKBYTES"))
 372                         image_info->hard_link_bytes = node_get_u64(child);
 373                 else if (node_name_is(child, "CREATIONTIME"))
 374                         image_info->creation_time = node_get_timestamp(child);
 375                 else if (node_name_is(child, "LASTMODIFICATIONTIME"))
 376                         image_info->last_modification_time = node_get_timestamp(child);
 377                 else if (node_name_is(child, "WINDOWS")) {
 378                         DEBUG("Found <WINDOWS> tag");
 379                         ret = xml_read_windows_info(child,
 380                                                     &image_info->windows_info);
 381                         image_info->windows_info_exists = true;
 382                 } else if (node_name_is(child, "NAME")) {
 383                         ret = node_get_string(child, &image_info->name);
 384                 } else if (node_name_is(child, "DESCRIPTION")) {
 385                         ret = node_get_string(child, &image_info->description);
 386                 } else if (node_name_is(child, "FLAGS")) {
 387                         ret = node_get_string(child, &image_info->flags);
 388                 } else if (node_name_is(child, "DISPLAYNAME")) {
 389                         ret = node_get_string(child, &image_info->display_name);
 390                 } else if (node_name_is(child, "DISPLAYDESCRIPTION")) {
 391                         ret = node_get_string(child, &image_info->display_description);
 392                 }
 393                 if (ret != 0)
 394                         return ret;
 395         }
 396         if (!image_info->name) {
 397                 char *empty_name;
 398                 WARNING("Image with index %d has no name", image_info->index);
 399                 empty_name = MALLOC(1);
 400                 if (!empty_name)
 401                         return WIMLIB_ERR_NOMEM;
 402                 *empty_name = '\0';
 403                 image_info->name = empty_name;
 404         }
 405         return ret;
 406 }
 407
 408 /* Reads the information from a <WIM> element, which should be the root element
 409  * of the XML tree. */
 410 static int xml_read_wim_info(const xmlNode *wim_node,
 411                              struct wim_info **wim_info_ret)
 412 {
 413         struct wim_info *wim_info;
 414         xmlNode *child;
 415         int ret;
 416         int num_images;
 417         int i;
 418
 419         wim_info = CALLOC(1, sizeof(struct wim_info));
 420         if (!wim_info)
 421                 return WIMLIB_ERR_NOMEM;
 422
 423         /* Count how many images there are. */
 424         num_images = 0;
 425         for_node_child(wim_node, child) {
 426                 if (node_is_element(child) && node_name_is(child, "IMAGE")) {
 427                         if (num_images == INT_MAX) {
 428                                 return WIMLIB_ERR_IMAGE_COUNT;
 429                         }
 430                         num_images++;
 431                 }
 432         }
 433
 434         if (num_images > 0) {
 435                 /* Allocate the array of struct image_infos and fill them in. */
 436                 wim_info->images = CALLOC(num_images, sizeof(wim_info->images[0]));
 437                 if (!wim_info->images) {
 438                         ret = WIMLIB_ERR_NOMEM;
 439                         goto err;
 440                 }
 441                 wim_info->num_images = num_images;
 442                 i = 0;
 443                 for_node_child(wim_node, child) {
 444                         if (!node_is_element(child))
 445                                 continue;
 446                         if (node_name_is(child, "IMAGE")) {
 447                                 DEBUG("Found <IMAGE> tag");
 448                                 ret = xml_read_image_info(child,
 449                                                           &wim_info->images[i]);
 450                                 if (ret != 0)
 451                                         goto err;
 452                                 i++;
 453                         } else if (node_name_is(child, "TOTALBYTES")) {
 454                                 wim_info->total_bytes = node_get_u64(child);
 455                         }
 456                 }
 457
 458                 /* Sort the array of image info by image index. */
 459                 qsort(wim_info->images, num_images,
 460                       sizeof(struct image_info), sort_by_index);
 461
 462                 /* Make sure the image indices make sense */
 463                 for (i = 0; i < num_images; i++) {
 464                         if (wim_info->images[i].index != i + 1) {
 465                                 ERROR("WIM images are not indexed [1...%d] "
 466                                       "in XML data as expected",
 467                                       num_images);
 468                                 return WIMLIB_ERR_IMAGE_COUNT;
 469                         }
 470                 }
 471
 472         }
 473         *wim_info_ret = wim_info;
 474         return 0;
 475 err:
 476         free_wim_info(wim_info);
 477         return ret;
 478 }
 479
 480 /* Prints the information contained in a `struct windows_info'. */
 481 static void print_windows_info(const struct windows_info *windows_info)
 482 {
 483         const struct windows_version *windows_version;
 484
 485         printf("Architecture:           %s\n", get_arch(windows_info->arch));
 486
 487         if (windows_info->product_name)
 488                 printf("Product Name:           %s\n",
 489                        windows_info->product_name);
 490
 491         if (windows_info->edition_id)
 492                 printf("Edition ID:             %s\n",
 493                        windows_info->edition_id);
 494
 495         if (windows_info->installation_type)
 496                 printf("Installation Type:      %s\n",
 497                        windows_info->installation_type);
 498
 499         if (windows_info->hal)
 500                 printf("HAL:                    %s\n",
 501                        windows_info->hal);
 502
 503         if (windows_info->product_type)
 504                 printf("Product Type:           %s\n",
 505                        windows_info->product_type);
 506
 507         if (windows_info->product_suite)
 508                 printf("Product Suite:          %s\n",
 509                        windows_info->product_suite);
 510
 511         printf("Languages:              ");
 512         for (size_t i = 0; i < windows_info->num_languages; i++) {
 513                 fputs(windows_info->languages[i], stdout);
 514                 putchar(' ');
 515         }
 516         putchar('\n');
 517         if (windows_info->default_language)
 518                 printf("Default Language:       %s\n",
 519                        windows_info->default_language);
 520         if (windows_info->system_root)
 521                 printf("System Root:            %s\n",
 522                        windows_info->system_root);
 523         if (windows_info->windows_version_exists) {
 524                 windows_version = &windows_info->windows_version;
 525                 printf("Major Version:          %"PRIu64"\n",
 526                        windows_version->major);
 527                 printf("Minor Version:          %"PRIu64"\n",
 528                        windows_version->minor);
 529                 printf("Build:                  %"PRIu64"\n",
 530                        windows_version->build);
 531                 printf("Service Pack Build:     %"PRIu64"\n",
 532                        windows_version->sp_build);
 533                 printf("Service Pack Level:     %"PRIu64"\n",
 534                        windows_version->sp_level);
 535         }
 536 }
 537
 538
 539 /* Writes the information contained in a `struct windows_version' to the XML
 540  * document being written.  This is the <VERSION> element inside the <WINDOWS>
 541  * element. */
 542 static int xml_write_windows_version(xmlTextWriter *writer,
 543                                      const struct windows_version *version)
 544 {
 545         int rc;
 546         rc = xmlTextWriterStartElement(writer, "VERSION");
 547         if (rc < 0)
 548                 return rc;
 549
 550         rc = xmlTextWriterWriteFormatElement(writer, "MAJOR", "%"PRIu64,
 551                                              version->major);
 552         if (rc < 0)
 553                 return rc;
 554
 555         rc = xmlTextWriterWriteFormatElement(writer, "MINOR", "%"PRIu64,
 556                                              version->minor);
 557         if (rc < 0)
 558                 return rc;
 559
 560         rc = xmlTextWriterWriteFormatElement(writer, "BUILD", "%"PRIu64,
 561                                              version->build);
 562         if (rc < 0)
 563                 return rc;
 564
 565         rc = xmlTextWriterWriteFormatElement(writer, "SPBUILD", "%"PRIu64,
 566                                              version->sp_build);
 567         if (rc < 0)
 568                 return rc;
 569
 570         rc = xmlTextWriterWriteFormatElement(writer, "SPLEVEL", "%"PRIu64,
 571                                              version->sp_level);
 572         if (rc < 0)
 573                 return rc;
 574
 575         return xmlTextWriterEndElement(writer); /* </VERSION> */
 576 }
 577
 578 /* Writes the information contained in a `struct windows_info' to the XML
 579  * document being written. This is the <WINDOWS> element. */
 580 static int xml_write_windows_info(xmlTextWriter *writer,
 581                                   const struct windows_info *windows_info)
 582 {
 583         int rc;
 584         rc = xmlTextWriterStartElement(writer, "WINDOWS");
 585         if (rc < 0)
 586                 return rc;
 587
 588         rc = xmlTextWriterWriteFormatElement(writer, "ARCH", "%"PRIu64,
 589                                              windows_info->arch);
 590         if (rc < 0)
 591                 return rc;
 592
 593         if (windows_info->product_name) {
 594                 rc = xmlTextWriterWriteElement(writer, "PRODUCTNAME",
 595                                                windows_info->product_name);
 596                 if (rc < 0)
 597                         return rc;
 598         }
 599
 600         if (windows_info->edition_id) {
 601                 rc = xmlTextWriterWriteElement(writer, "EDITIONID",
 602                                                windows_info->edition_id);
 603                 if (rc < 0)
 604                         return rc;
 605         }
 606
 607         if (windows_info->installation_type) {
 608                 rc = xmlTextWriterWriteElement(writer, "INSTALLATIONTYPE",
 609                                                windows_info->installation_type);
 610                 if (rc < 0)
 611                         return rc;
 612         }
 613
 614         if (windows_info->hal) {
 615                 rc = xmlTextWriterWriteElement(writer, "HAL",
 616                                                windows_info->hal);
 617                 if (rc < 0)
 618                         return rc;
 619         }
 620
 621         if (windows_info->product_type) {
 622                 rc = xmlTextWriterWriteElement(writer, "PRODUCTTYPE",
 623                                                windows_info->product_type);
 624                 if (rc < 0)
 625                         return rc;
 626         }
 627
 628         if (windows_info->product_suite) {
 629                 rc = xmlTextWriterWriteElement(writer, "PRODUCTSUITE",
 630                                                windows_info->product_suite);
 631                 if (rc < 0)
 632                         return rc;
 633         }
 634
 635         if (windows_info->num_languages) {
 636                 rc = xmlTextWriterStartElement(writer, "LANGUAGES");
 637                 if (rc < 0)
 638                         return rc;
 639
 640                 for (size_t i = 0; i < windows_info->num_languages; i++) {
 641                         rc = xmlTextWriterWriteElement(writer, "LANGUAGE",
 642                                                        windows_info->languages[i]);
 643                         if (rc < 0)
 644                                 return rc;
 645                 }
 646                 rc = xmlTextWriterWriteElement(writer, "DEFAULT",
 647                                                windows_info->default_language);
 648                 if (rc < 0)
 649                         return rc;
 650
 651                 rc = xmlTextWriterEndElement(writer); /* </LANGUAGES> */
 652                 if (rc < 0)
 653                         return rc;
 654         }
 655
 656         if (windows_info->windows_version_exists) {
 657                 rc = xml_write_windows_version(writer, &windows_info->windows_version);
 658                 if (rc < 0)
 659                         return rc;
 660         }
 661
 662         if (windows_info->system_root) {
 663                 rc = xmlTextWriterWriteElement(writer, "SYSTEMROOT",
 664                                                windows_info->system_root);
 665                 if (rc < 0)
 666                         return rc;
 667         }
 668
 669         return xmlTextWriterEndElement(writer); /* </WINDOWS> */
 670 }
 671
 672 /* Writes a time element to the XML document being constructed in memory. */
 673 static int xml_write_time(xmlTextWriter *writer, const char *element_name,
 674                           u64 time)
 675 {
 676         int rc;
 677         rc = xmlTextWriterStartElement(writer, element_name);
 678         if (rc < 0)
 679                 return rc;
 680
 681         rc = xmlTextWriterWriteFormatElement(writer, "HIGHPART",
 682                                              "0x%08"PRIX32, (u32)(time >> 32));
 683         if (rc < 0)
 684                 return rc;
 685
 686         rc = xmlTextWriterWriteFormatElement(writer, "LOWPART",
 687                                              "0x%08"PRIX32, (u32)time);
 688         if (rc < 0)
 689                 return rc;
 690
 691         rc = xmlTextWriterEndElement(writer); /* </@element_name> */
 692         if (rc < 0)
 693                 return rc;
 694         return 0;
 695 }
 696
 697 /* Writes an <IMAGE> element to the XML document. */
 698 static int xml_write_image_info(xmlTextWriter *writer,
 699                                 const struct image_info *image_info)
 700 {
 701         int rc;
 702         rc = xmlTextWriterStartElement(writer, "IMAGE");
 703         if (rc < 0)
 704                 return rc;
 705
 706         rc = xmlTextWriterWriteFormatAttribute(writer, "INDEX", "%d",
 707                                                image_info->index);
 708         if (rc < 0)
 709                 return rc;
 710
 711         rc = xmlTextWriterWriteFormatElement(writer, "DIRCOUNT", "%"PRIu64,
 712                                              image_info->dir_count);
 713         if (rc < 0)
 714                 return rc;
 715
 716         rc = xmlTextWriterWriteFormatElement(writer, "FILECOUNT", "%"PRIu64,
 717                                              image_info->file_count);
 718         if (rc < 0)
 719                 return rc;
 720
 721         rc = xmlTextWriterWriteFormatElement(writer, "TOTALBYTES", "%"PRIu64,
 722                                              image_info->total_bytes);
 723         if (rc < 0)
 724                 return rc;
 725
 726         rc = xmlTextWriterWriteFormatElement(writer, "HARDLINKBYTES", "%"PRIu64,
 727                                              image_info->hard_link_bytes);
 728         if (rc < 0)
 729                 return rc;
 730
 731         rc = xml_write_time(writer, "CREATIONTIME", image_info->creation_time);
 732         if (rc < 0)
 733                 return rc;
 734
 735         rc = xml_write_time(writer, "LASTMODIFICATIONTIME",
 736                             image_info->last_modification_time);
 737         if (rc < 0)
 738                 return rc;
 739
 740         if (image_info->windows_info_exists) {
 741                 rc = xml_write_windows_info(writer, &image_info->windows_info);
 742                 if (rc < 0)
 743                         return rc;
 744         }
 745
 746         if (image_info->name) {
 747                 rc = xmlTextWriterWriteElement(writer, "NAME",
 748                                                image_info->name);
 749                 if (rc < 0)
 750                         return rc;
 751         }
 752
 753         if (image_info->description) {
 754                 rc = xmlTextWriterWriteElement(writer, "DESCRIPTION",
 755                                                image_info->description);
 756                 if (rc < 0)
 757                         return rc;
 758         }
 759         if (image_info->display_name) {
 760                 rc = xmlTextWriterWriteElement(writer, "DISPLAYNAME",
 761                                                image_info->display_name);
 762                 if (rc < 0)
 763                         return rc;
 764         }
 765         if (image_info->display_description) {
 766                 rc = xmlTextWriterWriteElement(writer, "DISPLAYDESCRIPTION",
 767                                                image_info->display_description);
 768                 if (rc < 0)
 769                         return rc;
 770         }
 771
 772         if (image_info->flags) {
 773                 rc = xmlTextWriterWriteElement(writer, "FLAGS",
 774                                                image_info->flags);
 775                 if (rc < 0)
 776                         return rc;
 777         }
 778
 779         return xmlTextWriterEndElement(writer); /* </IMAGE> */
 780 }
 781
 782
 783
 784 /* Makes space for another image in the XML information and return a pointer to
 785  * it.*/
 786 static struct image_info *add_image_info_struct(struct wim_info *wim_info)
 787 {
 788         struct image_info *images;
 789
 790         images = CALLOC(wim_info->num_images + 1, sizeof(struct image_info));
 791         if (!images)
 792                 return NULL;
 793         memcpy(images, wim_info->images,
 794                wim_info->num_images * sizeof(struct image_info));
 795         FREE(wim_info->images);
 796         wim_info->images = images;
 797         wim_info->num_images++;
 798         return &images[wim_info->num_images - 1];
 799 }
 800
 801 static int clone_windows_info(const struct windows_info *old,
 802                               struct windows_info *new)
 803 {
 804         if (old->product_name && !(new->product_name = STRDUP(old->product_name)))
 805                 return WIMLIB_ERR_NOMEM;
 806         if (old->edition_id && !(new->edition_id = STRDUP(old->edition_id)))
 807                 return WIMLIB_ERR_NOMEM;
 808         if (old->installation_type && !(new->installation_type =
 809                                         STRDUP(old->installation_type)))
 810                 return WIMLIB_ERR_NOMEM;
 811         if (old->hal && !(new->hal = STRDUP(old->hal)))
 812                 return WIMLIB_ERR_NOMEM;
 813         if (old->product_type && !(new->product_type = STRDUP(old->product_type)))
 814                 return WIMLIB_ERR_NOMEM;
 815         if (old->product_suite && !(new->product_suite = STRDUP(old->product_suite)))
 816                 return WIMLIB_ERR_NOMEM;
 817
 818         if (old->languages) {
 819                 new->languages = CALLOC(old->num_languages, sizeof(char*));
 820                 if (!new->languages)
 821                         return WIMLIB_ERR_NOMEM;
 822                 new->num_languages = old->num_languages;
 823                 for (size_t i = 0; i < new->num_languages; i++) {
 824                         if (!old->languages[i])
 825                                 continue;
 826                         new->languages[i] = STRDUP(old->languages[i]);
 827                         if (!new->languages[i])
 828                                 return WIMLIB_ERR_NOMEM;
 829                 }
 830         }
 831         if (old->default_language &&
 832                         !(new->default_language = STRDUP(old->default_language)))
 833                 return WIMLIB_ERR_NOMEM;
 834         if (old->system_root && !(new->system_root = STRDUP(old->system_root)))
 835                 return WIMLIB_ERR_NOMEM;
 836         if (old->windows_version_exists) {
 837                 new->windows_version_exists = true;
 838                 memcpy(&new->windows_version, &old->windows_version,
 839                        sizeof(old->windows_version));
 840         }
 841         return 0;
 842 }
 843
 844 static int clone_image_info(const struct image_info *old, struct image_info *new)
 845 {
 846         new->dir_count              = old->dir_count;
 847         new->file_count             = old->file_count;
 848         new->total_bytes            = old->total_bytes;
 849         new->hard_link_bytes        = old->hard_link_bytes;
 850         new->creation_time          = old->creation_time;
 851         new->last_modification_time = old->last_modification_time;
 852
 853         if (!(new->name = STRDUP(old->name)))
 854                 return WIMLIB_ERR_NOMEM;
 855
 856         if (old->description)
 857                 if (!(new->description = STRDUP(old->description)))
 858                         return WIMLIB_ERR_NOMEM;
 859
 860         if (old->display_name)
 861                 if (!(new->display_name = STRDUP(old->display_name)))
 862                         return WIMLIB_ERR_NOMEM;
 863
 864         if (old->display_description)
 865                 if (!(new->display_description = STRDUP(old->display_description)))
 866                         return WIMLIB_ERR_NOMEM;
 867
 868         if (old->flags)
 869                 if (!(new->flags = STRDUP(old->flags)))
 870                         return WIMLIB_ERR_NOMEM;
 871
 872         if (old->windows_info_exists) {
 873                 new->windows_info_exists = true;
 874                 return clone_windows_info(&old->windows_info,
 875                                           &new->windows_info);
 876         }
 877         return 0;
 878 }
 879
 880 /* Copies the XML information for an image between WIM files.
 881  *
 882  * @dest_image_name and @dest_image_description are ignored if they are NULL;
 883  * otherwise, they are used to override the image name and/or image description
 884  * from the XML data in the source WIM file.
 885  *
 886  * On failure, WIMLIB_ERR_NOMEM is returned and no changes are made.  Otherwise,
 887  * 0 is returned and the WIM information at *new_wim_info_p is modified.
 888  */
 889 int xml_export_image(const struct wim_info *old_wim_info,
 890                      int image,
 891                      struct wim_info **new_wim_info_p,
 892                      const char *dest_image_name,
 893                      const char *dest_image_description)
 894 {
 895         struct wim_info *new_wim_info;
 896         struct image_info *image_info;
 897         int ret;
 898
 899         DEBUG("Copying XML data between WIM files for source image %d.", image);
 900
 901         wimlib_assert(old_wim_info != NULL);
 902         wimlib_assert(image >= 1 && image <= old_wim_info->num_images);
 903
 904         if (*new_wim_info_p) {
 905                 new_wim_info = *new_wim_info_p;
 906         } else {
 907                 new_wim_info = CALLOC(1, sizeof(struct wim_info));
 908                 if (!new_wim_info)
 909                         goto err;
 910         }
 911
 912         image_info = add_image_info_struct(new_wim_info);
 913         if (!image_info)
 914                 goto err;
 915
 916         ret = clone_image_info(&old_wim_info->images[image - 1], image_info);
 917         if (ret != 0)
 918                 goto err_destroy_image_info;
 919
 920         image_info->index = new_wim_info->num_images;
 921
 922         if (dest_image_name) {
 923                 FREE(image_info->name);
 924                 image_info->name = STRDUP(dest_image_name);
 925                 if (!image_info->name)
 926                         goto err_destroy_image_info;
 927         }
 928         if (dest_image_description) {
 929                 FREE(image_info->description);
 930                 image_info->description = STRDUP(dest_image_description);
 931                 if (!image_info->description)
 932                         goto err_destroy_image_info;
 933         }
 934         *new_wim_info_p = new_wim_info;
 935         return 0;
 936 err_destroy_image_info:
 937         destroy_image_info(image_info);
 938 err:
 939         if (new_wim_info != *new_wim_info_p)
 940                 free_wim_info(new_wim_info);
 941         return WIMLIB_ERR_NOMEM;
 942 }
 943
 944 /* Removes an image from the XML information. */
 945 void xml_delete_image(struct wim_info **wim_info_p, int image)
 946 {
 947         struct wim_info *wim_info;
 948
 949         DEBUG("Deleting image %d from the XML data.", image);
 950
 951         wim_info = *wim_info_p;
 952
 953         destroy_image_info(&wim_info->images[image - 1]);
 954
 955         memcpy(&wim_info->images[image - 1],
 956                &wim_info->images[image],
 957                (wim_info->num_images - image) * sizeof(struct image_info));
 958
 959         if (--wim_info->num_images == 0) {
 960                 free_wim_info(wim_info);
 961                 *wim_info_p = NULL;
 962         } else {
 963                 for (int i = image - 1; i < wim_info->num_images; i++)
 964                         wim_info->images[i].index--;
 965         }
 966 }
 967
 968 size_t xml_get_max_image_name_len(const WIMStruct *w)
 969 {
 970         size_t max_len = 0;
 971         if (w->wim_info) {
 972                 size_t len;
 973                 for (int i = 0; i < w->wim_info->num_images; i++) {
 974                         len = strlen(w->wim_info->images[i].name);
 975                         if (len > max_len)
 976                                 max_len = len;
 977                 }
 978         }
 979         return max_len;
 980 }
 981
 982 #ifdef ENABLE_CUSTOM_MEMORY_ALLOCATOR
 983 void xml_set_memory_allocator(void *(*malloc_func)(size_t),
 984                                    void (*free_func)(void *),
 985                                    void *(*realloc_func)(void *, size_t))
 986 {
 987         xmlMemSetup(free_func, malloc_func, realloc_func, STRDUP);
 988 }
 989 #endif
 990
 991 static int calculate_dentry_statistics(struct dentry *dentry, void *arg)
 992 {
 993         struct image_info *info = arg;
 994         struct lookup_table *lookup_table = info->lookup_table;
 995         const struct inode *inode = dentry->d_inode;
 996         struct lookup_table_entry *lte;
 997
 998         /* Update directory count and file count.
 999          *
1000          * Each dentry counts as either a file or a directory, but not both.
1001          * The root directory is an exception: it is not counted at all.
1002          *
1003          * Symbolic links and junction points (and presumably other reparse
1004          * points) count as regular files.  This is despite the fact that
1005          * junction points have FILE_ATTRIBUTE_DIRECTORY set.
1006          */
1007         if (dentry_is_root(dentry))
1008                 return 0;
1009
1010         if (inode_is_directory(inode))
1011                 info->dir_count++;
1012         else
1013                 info->file_count++;
1014
1015         /*
1016          * Update total bytes and hard link bytes.
1017          *
1018          * Unfortunately there are some inconsistencies/bugs in the way this is
1019          * done.
1020          *
1021          * If there are no alternate data streams in the image, the "total
1022          * bytes" is the sum of the size of the un-named data stream of each
1023          * inode times the link count of that inode.  In other words, it would
1024          * be the total number of bytes of regular files you would have if you
1025          * extracted the full image without any hard-links.  The "hard link
1026          * bytes" is equal to the "total bytes" minus the size of the un-named
1027          * data stream of each inode.  In other words, the "hard link bytes"
1028          * counts the size of the un-named data stream for all the links to each
1029          * inode except the first one.
1030          *
1031          * Reparse points and directories don't seem to be counted in either the
1032          * total bytes or the hard link bytes.
1033          *
1034          * And now we get to the most confusing part, the alternate data
1035          * streams.  They are not counted in the "total bytes".  However, if the
1036          * link count of an inode with alternate data streams is 2 or greater,
1037          * the size of all the alternate data streams is included in the "hard
1038          * link bytes", and this size is multiplied by the link count (NOT one
1039          * less than the link count).
1040          */
1041         lte = inode_unnamed_lte(inode, info->lookup_table);
1042         if (lte) {
1043                 info->total_bytes += wim_resource_size(lte);
1044                 if (!dentry_is_first_in_inode(dentry))
1045                         info->hard_link_bytes += wim_resource_size(lte);
1046         }
1047
1048         if (inode->link_count >= 2 && dentry_is_first_in_inode(dentry)) {
1049                 for (unsigned i = 0; i < inode->num_ads; i++) {
1050                         if (inode->ads_entries[i].stream_name_len) {
1051                                 lte = inode_stream_lte(inode, i + 1, lookup_table);
1052                                 if (lte) {
1053                                         info->hard_link_bytes += inode->link_count *
1054                                                                  wim_resource_size(lte);
1055                                 }
1056                         }
1057                 }
1058         }
1059         return 0;
1060 }
1061
1062 /*
1063  * Calculate what to put in the <FILECOUNT>, <DIRCOUNT>, <TOTALBYTES>, and
1064  * <HARDLINKBYTES> elements of each <IMAGE>.
1065  *
1066  * Please note there is no official documentation for exactly how this is done.
1067  * But, see calculate_dentry_statistics().
1068  */
1069 void xml_update_image_info(WIMStruct *w, int image)
1070 {
1071         struct image_info *image_info;
1072         char *flags_save;
1073
1074         DEBUG("Updating the image info for image %d", image);
1075
1076         image_info = &w->wim_info->images[image - 1];
1077
1078         image_info->file_count      = 0;
1079         image_info->dir_count       = 0;
1080         image_info->total_bytes     = 0;
1081         image_info->hard_link_bytes = 0;
1082
1083         flags_save = image_info->flags;
1084         image_info->lookup_table = w->lookup_table;
1085         for_dentry_in_tree(w->image_metadata[image - 1].root_dentry,
1086                            calculate_dentry_statistics,
1087                            image_info);
1088         image_info->flags = flags_save;
1089         image_info->last_modification_time = get_wim_timestamp();
1090 }
1091
1092 /* Adds an image to the XML information. */
1093 int xml_add_image(WIMStruct *w, const char *name)
1094 {
1095         struct wim_info *wim_info;
1096         struct image_info *image_info;
1097
1098         wimlib_assert(name != NULL);
1099
1100         /* If this is the first image, allocate the struct wim_info.  Otherwise
1101          * use the existing struct wim_info. */
1102         if (w->wim_info) {
1103                 wim_info = w->wim_info;
1104         } else {
1105                 wim_info = CALLOC(1, sizeof(struct wim_info));
1106                 if (!wim_info)
1107                         return WIMLIB_ERR_NOMEM;
1108         }
1109
1110         image_info = add_image_info_struct(wim_info);
1111         if (!image_info)
1112                 goto out_free_wim_info;
1113
1114         if (!(image_info->name = STRDUP(name)))
1115                 goto out_destroy_image_info;
1116
1117         w->wim_info = wim_info;
1118         image_info->index = wim_info->num_images;
1119         image_info->creation_time = get_wim_timestamp();
1120         xml_update_image_info(w, image_info->index);
1121         return 0;
1122
1123 out_destroy_image_info:
1124         destroy_image_info(image_info);
1125         wim_info->num_images--;
1126 out_free_wim_info:
1127         if (wim_info != w->wim_info)
1128                 FREE(wim_info);
1129         return WIMLIB_ERR_NOMEM;
1130 }
1131
1132 /* Prints information about the specified image from struct wim_info structure.
1133  * */
1134 void print_image_info(const struct wim_info *wim_info, int image)
1135 {
1136         const struct image_info *image_info;
1137         const char *desc;
1138         char buf[50];
1139
1140         wimlib_assert(image >= 1 && image <= wim_info->num_images);
1141
1142         image_info = &wim_info->images[image - 1];
1143
1144         printf("Index:                  %d\n", image_info->index);
1145         printf("Name:                   %s\n", image_info->name);
1146
1147         /* Always print the Description: part even if there is no
1148          * description. */
1149         if (image_info->description)
1150                 desc = image_info->description;
1151         else
1152                 desc = "";
1153         printf("Description:            %s\n", desc);
1154
1155         if (image_info->display_name)
1156                 printf("Display Name:           %s\n",
1157                        image_info->display_name);
1158
1159         if (image_info->display_description)
1160                 printf("Display Description:    %s\n",
1161                        image_info->display_description);
1162
1163         printf("Directory Count:        %"PRIu64"\n", image_info->dir_count);
1164         printf("File Count:             %"PRIu64"\n", image_info->file_count);
1165         printf("Total Bytes:            %"PRIu64"\n", image_info->total_bytes);
1166         printf("Hard Link Bytes:        %"PRIu64"\n", image_info->hard_link_bytes);
1167
1168         wim_timestamp_to_str(image_info->creation_time, buf, sizeof(buf));
1169         printf("Creation Time:          %s\n", buf);
1170
1171         wim_timestamp_to_str(image_info->creation_time, buf, sizeof(buf));
1172         printf("Last Modification Time: %s\n", buf);
1173         if (image_info->windows_info_exists)
1174                 print_windows_info(&image_info->windows_info);
1175         if (image_info->flags)
1176                 printf("Flags:                  %s\n", image_info->flags);
1177         putchar('\n');
1178 }
1179
1180 /*
1181  * Reads the XML data from a WIM file.
1182  */
1183 int read_xml_data(FILE *fp, const struct resource_entry *res_entry,
1184                   u8 **xml_data_ret, struct wim_info **info_ret)
1185 {
1186         u8 *xml_data;
1187         xmlDoc *doc;
1188         xmlNode *root;
1189         int ret;
1190
1191         DEBUG("XML data is %"PRIu64" bytes at offset %"PRIu64"",
1192               (u64)res_entry->size, res_entry->offset);
1193
1194         if (resource_is_compressed(res_entry)) {
1195                 ERROR("XML data is supposed to be uncompressed");
1196                 ret = WIMLIB_ERR_XML;
1197                 goto out_cleanup_parser;
1198         }
1199
1200         if (res_entry->size < 2) {
1201                 ERROR("XML data must be at least 2 bytes long");
1202                 ret = WIMLIB_ERR_XML;
1203                 goto out_cleanup_parser;
1204         }
1205
1206         xml_data = MALLOC(res_entry->size + 2);
1207         if (!xml_data) {
1208                 ret = WIMLIB_ERR_NOMEM;
1209                 goto out_cleanup_parser;
1210         }
1211
1212         ret = read_uncompressed_resource(fp, res_entry->offset,
1213                                          res_entry->size, xml_data);
1214         if (ret != 0)
1215                 goto out_free_xml_data;
1216
1217         /* Null-terminate just in case */
1218         xml_data[res_entry->size] = 0;
1219         xml_data[res_entry->size + 1] = 0;
1220
1221         DEBUG("Parsing XML using libxml2 to create XML tree");
1222
1223         doc = xmlReadMemory(xml_data, res_entry->size,
1224                             "noname.xml", "UTF-16", 0);
1225
1226         if (!doc) {
1227                 ERROR("Failed to parse XML data");
1228                 ret = WIMLIB_ERR_XML;
1229                 goto out_free_xml_data;
1230         }
1231
1232         DEBUG("Constructing WIM information structure from XML tree.");
1233
1234         root = xmlDocGetRootElement(doc);
1235         if (!root) {
1236                 ERROR("WIM XML data is an empty XML document");
1237                 ret = WIMLIB_ERR_XML;
1238                 goto out_free_doc;
1239         }
1240
1241         if (!node_is_element(root) || !node_name_is(root, "WIM")) {
1242                 ERROR("Expected <WIM> for the root XML element (found <%s>)",
1243                       root->name);
1244                 ret = WIMLIB_ERR_XML;
1245                 goto out_free_doc;
1246         }
1247
1248         ret = xml_read_wim_info(root, info_ret);
1249         if (ret != 0)
1250                 goto out_free_doc;
1251
1252         DEBUG("Freeing XML tree.");
1253
1254         *xml_data_ret = xml_data;
1255         xml_data = NULL;
1256 out_free_doc:
1257         xmlFreeDoc(doc);
1258 out_free_xml_data:
1259         FREE(xml_data);
1260 out_cleanup_parser:
1261         xmlCleanupParser();
1262         return ret;
1263 }
1264
1265 #define CHECK_RET  ({   if (ret < 0)  { \
1266                                 ERROR("Error writing XML data"); \
1267                                 ret = WIMLIB_ERR_WRITE; \
1268                                 goto out_free_text_writer; \
1269                         } })
1270
1271 /*
1272  * Writes XML data to a WIM file.
1273  *
1274  * If @total_bytes is non-zero, it specifies what to write to the TOTALBYTES
1275  * element in the XML data.  If zero, TOTALBYTES is given the default value of
1276  * the offset of the XML data.
1277  */
1278 int write_xml_data(const struct wim_info *wim_info, int image, FILE *out,
1279                    u64 total_bytes, struct resource_entry *out_res_entry)
1280 {
1281         xmlCharEncodingHandler *encoding_handler;
1282         xmlOutputBuffer *out_buffer;
1283         xmlTextWriter *writer;
1284         int ret;
1285         off_t start_offset;
1286         off_t end_offset;
1287
1288         wimlib_assert(image == WIMLIB_ALL_IMAGES ||
1289                         (wim_info != NULL && image >= 1 &&
1290                          image <= wim_info->num_images));
1291
1292         start_offset = ftello(out);
1293         if (start_offset == -1)
1294                 return WIMLIB_ERR_WRITE;
1295
1296         DEBUG("Writing XML data for image %d at offset %"PRIu64,
1297               image, start_offset);
1298
1299         /* 2 bytes endianness marker for UTF-16LE.  This is _required_ for WIM
1300          * XML data. */
1301         if ((putc(0xff, out)) == EOF || (putc(0xfe, out) == EOF)) {
1302                 ERROR_WITH_ERRNO("Error writing XML data");
1303                 return WIMLIB_ERR_WRITE;
1304         }
1305
1306         /* The contents of the <TOTALBYTES> element in the XML data, under the
1307          * <WIM> element (not the <IMAGE> element), is for non-split WIMs the
1308          * size of the WIM file excluding the XML data and integrity table.
1309          * This should be equal to the current position in the output stream,
1310          * since the XML data and integrity table are the last elements of the
1311          * WIM.
1312          *
1313          * For split WIMs, <TOTALBYTES> takes into account the entire WIM, not
1314          * just the current part.  In that case, @total_bytes should be passed
1315          * in to this function. */
1316         if (total_bytes == 0)
1317                 total_bytes = start_offset;
1318
1319         xmlInitCharEncodingHandlers();
1320
1321         /* The encoding of the XML data must be UTF-16LE. */
1322         encoding_handler = xmlGetCharEncodingHandler(XML_CHAR_ENCODING_UTF16LE);
1323         if (!encoding_handler) {
1324                 ERROR("Failed to get XML character encoding handler for UTF-16LE");
1325                 ret = WIMLIB_ERR_LIBXML_UTF16_HANDLER_NOT_AVAILABLE;
1326                 goto out_cleanup_char_encoding_handlers;
1327         }
1328
1329         out_buffer = xmlOutputBufferCreateFile(out, encoding_handler);
1330         if (!out_buffer) {
1331                 ERROR("Failed to allocate xmlOutputBuffer");
1332                 ret = WIMLIB_ERR_NOMEM;
1333                 goto out_cleanup_char_encoding_handlers;
1334         }
1335
1336         writer = xmlNewTextWriter(out_buffer);
1337         if (!writer) {
1338                 ERROR("Failed to allocate xmlTextWriter");
1339                 ret = WIMLIB_ERR_NOMEM;
1340                 goto out_output_buffer_close;
1341         }
1342
1343         DEBUG("Writing <WIM> element");
1344
1345         ret = xmlTextWriterStartElement(writer, "WIM");
1346         CHECK_RET;
1347
1348         ret = xmlTextWriterWriteFormatElement(writer, "TOTALBYTES", "%"PRIu64,
1349                                               total_bytes);
1350         CHECK_RET;
1351
1352         if (wim_info != NULL) {
1353                 int first, last;
1354                 if (image == WIMLIB_ALL_IMAGES) {
1355                         first = 1;
1356                         last = wim_info->num_images;
1357                 } else {
1358                         first = image;
1359                         last = image;
1360                 }
1361                 DEBUG("Writing %d <IMAGE> elements", last - first + 1);
1362                 for (int i = first; i <= last; i++) {
1363                         ret = xml_write_image_info(writer, &wim_info->images[i - 1]);
1364                         CHECK_RET;
1365                 }
1366         }
1367
1368         ret = xmlTextWriterEndElement(writer);
1369         CHECK_RET;
1370
1371         ret = xmlTextWriterEndDocument(writer);
1372         CHECK_RET;
1373
1374         DEBUG("Ended XML document");
1375
1376         /* Call xmlFreeTextWriter() before ftello() because the former will
1377          * flush the file stream. */
1378         xmlFreeTextWriter(writer);
1379         writer = NULL;
1380
1381         end_offset = ftello(out);
1382         if (end_offset == -1) {
1383                 ret = WIMLIB_ERR_WRITE;
1384         } else {
1385                 ret = 0;
1386                 out_res_entry->offset        = start_offset;
1387                 out_res_entry->size          = end_offset - start_offset;
1388                 out_res_entry->original_size = end_offset - start_offset;
1389                 out_res_entry->flags         = WIM_RESHDR_FLAG_METADATA;
1390         }
1391 out_free_text_writer:
1392         /* xmlFreeTextWriter will free the attached xmlOutputBuffer. */
1393         xmlFreeTextWriter(writer);
1394         out_buffer = NULL;
1395 out_output_buffer_close:
1396         if (out_buffer != NULL)
1397                 xmlOutputBufferClose(out_buffer);
1398 out_cleanup_char_encoding_handlers:
1399         xmlCleanupCharEncodingHandlers();
1400 out:
1401         if (ret == 0)
1402                 DEBUG("Successfully wrote XML data");
1403         return ret;
1404 }
1405
1406 /* Returns the name of the specified image. */
1407 WIMLIBAPI const char *wimlib_get_image_name(const WIMStruct *w, int image)
1408 {
1409         if (image < 1 || image > w->hdr.image_count)
1410                 return NULL;
1411         return w->wim_info->images[image - 1].name;
1412 }
1413
1414 /* Returns the description of the specified image. */
1415 WIMLIBAPI const char *wimlib_get_image_description(const WIMStruct *w,
1416                                                    int image)
1417 {
1418         if (image < 1 || image > w->hdr.image_count)
1419                 return NULL;
1420         return w->wim_info->images[image - 1].description;
1421 }
1422
1423 /* Determines if an image name is already used by some image in the WIM. */
1424 WIMLIBAPI bool wimlib_image_name_in_use(const WIMStruct *w, const char *name)
1425 {
1426         if (!name || !*name)
1427                 return false;
1428         for (int i = 1; i <= w->hdr.image_count; i++)
1429                 if (strcmp(w->wim_info->images[i - 1].name, name) == 0)
1430                         return true;
1431         return false;
1432 }
1433
1434 /* Extracts the raw XML data to a file stream. */
1435 WIMLIBAPI int wimlib_extract_xml_data(WIMStruct *w, FILE *fp)
1436 {
1437         if (!w->xml_data)
1438                 return WIMLIB_ERR_INVALID_PARAM;
1439         if (fwrite(w->xml_data, 1, w->hdr.xml_res_entry.size, fp) !=
1440                         w->hdr.xml_res_entry.size) {
1441                 ERROR_WITH_ERRNO("Failed to extract XML data");
1442                 return WIMLIB_ERR_WRITE;
1443         }
1444         return 0;
1445 }
1446
1447 /* Sets the name of an image in the WIM. */
1448 WIMLIBAPI int wimlib_set_image_name(WIMStruct *w, int image, const char *name)
1449 {
1450         char *p;
1451         int i;
1452
1453         DEBUG("Setting the name of image %d to %s", image, name);
1454
1455         if (!name || !*name) {
1456                 ERROR("Must specify a non-empty string for the image name");
1457                 return WIMLIB_ERR_INVALID_PARAM;
1458         }
1459
1460         if (image < 1 || image > w->hdr.image_count) {
1461                 ERROR("%d is not a valid image", image);
1462                 return WIMLIB_ERR_INVALID_IMAGE;
1463         }
1464
1465         for (i = 1; i <= w->hdr.image_count; i++) {
1466                 if (i == image)
1467                         continue;
1468                 if (strcmp(w->wim_info->images[i - 1].name, name) == 0) {
1469                         ERROR("The name `%s' is already used for image %d",
1470                               name, i);
1471                         return WIMLIB_ERR_IMAGE_NAME_COLLISION;
1472                 }
1473         }
1474
1475         p = STRDUP(name);
1476         if (!p)
1477                 return WIMLIB_ERR_NOMEM;
1478
1479         FREE(w->wim_info->images[image - 1].name);
1480         w->wim_info->images[image - 1].name = p;
1481         return 0;
1482 }
1483
1484 /* Sets the description of an image in the WIM. */
1485 WIMLIBAPI int wimlib_set_image_descripton(WIMStruct *w, int image,
1486                                           const char *description)
1487 {
1488         char *p;
1489
1490         if (image < 1 || image > w->hdr.image_count) {
1491                 ERROR("%d is not a valid image", image);
1492                 return WIMLIB_ERR_INVALID_IMAGE;
1493         }
1494         if (description) {
1495                 p = STRDUP(description);
1496                 if (!p)
1497                         return WIMLIB_ERR_NOMEM;
1498         } else {
1499                 p = NULL;
1500         }
1501         FREE(w->wim_info->images[image - 1].description);
1502         w->wim_info->images[image - 1].description = p;
1503         return 0;
1504 }
1505
1506 /* Set the <FLAGS> element of a WIM image */
1507 WIMLIBAPI int wimlib_set_image_flags(WIMStruct *w, int image,
1508                                      const char *flags)
1509 {
1510         char *p;
1511
1512         if (image < 1 || image > w->hdr.image_count) {
1513                 ERROR("%d is not a valid image", image);
1514                 return WIMLIB_ERR_INVALID_IMAGE;
1515         }
1516         if (flags) {
1517                 p = STRDUP(flags);
1518                 if (!p)
1519                         return WIMLIB_ERR_NOMEM;
1520         } else {
1521                 p = NULL;
1522         }
1523         FREE(w->wim_info->images[image - 1].flags);
1524         w->wim_info->images[image - 1].flags = p;
1525         return 0;
1526 }