wimlib.net Git - wimlib/blob - src/xml.c

   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, 2013, 2015 Eric Biggers
   9  *
  10  * This file 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 3 of the License, or (at your option) any
  13  * later version.
  14  *
  15  * This file is distributed in the hope that it will be useful, but WITHOUT
  16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  17  * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this file; if not, see http://www.gnu.org/licenses/.
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include "config.h"
  26 #endif
  27
  28 #include <libxml/parser.h>
  29 #include <libxml/tree.h>
  30 #include <libxml/xmlsave.h>
  31 #include <string.h>
  32
  33 #include "wimlib/blob_table.h"
  34 #include "wimlib/dentry.h"
  35 #include "wimlib/encoding.h"
  36 #include "wimlib/error.h"
  37 #include "wimlib/file_io.h"
  38 #include "wimlib/metadata.h"
  39 #include "wimlib/resource.h"
  40 #include "wimlib/timestamp.h"
  41 #include "wimlib/xml.h"
  42 #include "wimlib/write.h"
  43
  44 /*
  45  * A wrapper around a WIM file's XML document.  The XML document contains
  46  * metadata about each image in the WIM file as well as metadata about the WIM
  47  * file itself.
  48  */
  49 struct wim_xml_info {
  50
  51         /* The parsed XML document as a libxml2 document tree  */
  52         xmlDocPtr doc;
  53
  54         /* The root element of the document.  This is a cached value, equal to
  55          * xmlDocGetRootElement(doc).  */
  56         xmlNode *root;
  57
  58         /* A malloc()ed array containing a pointer to the IMAGE element for each
  59          * WIM image.  The image with 1-based index 'i' is at index 'i - 1' in
  60          * this array.  Note: these pointers are cached values, since they could
  61          * also be found by searching the document.  */
  62         xmlNode **images;
  63
  64         /* The number of WIM images (the length of 'images')  */
  65         int image_count;
  66
  67         /* Temporary memory for UTF-8 => 'tchar' string translations.  When an
  68          * API function needs to return a 'tchar' string, it uses one of these
  69          * array slots to hold the string and returns a pointer to it.  */
  70         tchar *strings[128];
  71         size_t next_string_idx;
  72         size_t num_strings;
  73 };
  74
  75 /*----------------------------------------------------------------------------*
  76  *                            Internal functions                              *
  77  *----------------------------------------------------------------------------*/
  78
  79 /* Iterate through the children of an xmlNode.  */
  80 #define node_for_each_child(parent, child)      \
  81         for (child = (parent)->children; child != NULL; child = child->next)
  82
  83 /* Is the specified node an element of the specified name?  */
  84 static bool
  85 node_is_element(const xmlNode *node, const xmlChar *name)
  86 {
  87         return node->type == XML_ELEMENT_NODE && xmlStrEqual(node->name, name);
  88 }
  89
  90 /* Retrieve a pointer to the UTF-8 text contents of the specified node, or NULL
  91  * if the node has no text contents.  This assumes the simple case where the
  92  * node has a single TEXT child node.  */
  93 static const xmlChar *
  94 node_get_text(const xmlNode *node)
  95 {
  96         const xmlNode *child;
  97
  98         if (!node)
  99                 return NULL;
 100         node_for_each_child(node, child)
 101                 if (child->type == XML_TEXT_NODE && child->content)
 102                         return child->content;
 103         return NULL;
 104 }
 105
 106 /* Retrieve an unsigned integer from the contents of the specified node,
 107  * decoding it using the specified base.  If the node has no contents or does
 108  * not contain a valid number, returns 0.  */
 109 static u64
 110 node_get_number(const xmlNode *node, int base)
 111 {
 112         const xmlChar *str = node_get_text(node);
 113         char *end;
 114         unsigned long long v;
 115
 116         if (!str)
 117                 return 0;
 118         v = strtoull(str, &end, base);
 119         if ((xmlChar *)end == str || *end || v >= UINT64_MAX)
 120                 return 0;
 121         return v;
 122 }
 123
 124 /* Retrieve the timestamp from a time node.  This node should have child
 125  * elements HIGHPART and LOWPART; these elements will be used to construct a
 126  * Windows-style timestamp.  */
 127 static u64
 128 node_get_timestamp(const xmlNode *node)
 129 {
 130         u64 timestamp = 0;
 131         xmlNode *child;
 132
 133         if (!node)
 134                 return 0;
 135         node_for_each_child(node, child) {
 136                 if (node_is_element(child, "HIGHPART"))
 137                         timestamp |= node_get_number(child, 16) << 32;
 138                 else if (node_is_element(child, "LOWPART"))
 139                         timestamp |= node_get_number(child, 16);
 140         }
 141         return timestamp;
 142 }
 143
 144 static int
 145 tstr_get_utf8(const tchar *tstr, const xmlChar **utf8_ret)
 146 {
 147         if (wimlib_mbs_is_utf8) {
 148                 *utf8_ret = (xmlChar *)tstr;
 149                 return 0;
 150         }
 151         return tstr_to_utf8_simple(tstr, (char **)utf8_ret);
 152 }
 153
 154 static void
 155 tstr_put_utf8(const xmlChar *utf8)
 156 {
 157         if (!wimlib_mbs_is_utf8)
 158                 FREE((void *)utf8);
 159 }
 160
 161 /* Retrieve the text contents of an XML element as a 'tchar' string.  If not
 162  * found or if the text could not be translated, returns NULL.  */
 163 static const tchar *
 164 node_get_ttext(struct wim_xml_info *info, xmlNode *node)
 165 {
 166         const xmlChar *text;
 167         tchar **ttext_p;
 168
 169         text = node_get_text(node);
 170
 171         if (!text || wimlib_mbs_is_utf8)
 172                 return (const tchar *)text;
 173
 174         ttext_p = &info->strings[info->next_string_idx];
 175         if (info->num_strings >= ARRAY_LEN(info->strings)) {
 176                 FREE(*ttext_p);
 177                 *ttext_p = NULL;
 178         }
 179         if (utf8_to_tstr_simple(text, ttext_p))
 180                 return NULL;
 181         if (info->num_strings < ARRAY_LEN(info->strings))
 182                 info->num_strings++;
 183         info->next_string_idx++;
 184         info->next_string_idx %= ARRAY_LEN(info->strings);
 185         return *ttext_p;
 186 }
 187
 188 /* Unlink the specified node from its parent, then free it (recursively).  */
 189 static void
 190 unlink_and_free_tree(xmlNode *node)
 191 {
 192         xmlUnlinkNode(node);
 193         xmlFreeNode(node);
 194 }
 195
 196 /* Unlink and free (recursively) all children of the specified node.  */
 197 static void
 198 unlink_and_free_children(xmlNode *node)
 199 {
 200         xmlNode *child;
 201
 202         while ((child = node->last) != NULL)
 203                 unlink_and_free_tree(child);
 204 }
 205
 206 /* Add the new child element 'replacement' to 'parent', replacing any same-named
 207  * element that may already exist.  */
 208 static void
 209 node_replace_child_element(xmlNode *parent, xmlNode *replacement)
 210 {
 211         xmlNode *child;
 212
 213         node_for_each_child(parent, child) {
 214                 if (node_is_element(child, replacement->name)) {
 215                         xmlReplaceNode(child, replacement);
 216                         xmlFreeNode(child);
 217                         return;
 218                 }
 219         }
 220
 221         xmlAddChild(parent, replacement);
 222 }
 223
 224 /* Set the text contents of the specified element to the specified string,
 225  * replacing the existing contents (if any).  The string is "raw" and is
 226  * permitted to contain characters that have special meaning in XML.  */
 227 static int
 228 node_set_text(xmlNode *node, const xmlChar *text)
 229 {
 230         xmlNode *text_node = xmlNewText(text);
 231         if (!text_node)
 232                 return WIMLIB_ERR_NOMEM;
 233         unlink_and_free_children(node);
 234         xmlAddChild(node, text_node);
 235         return 0;
 236 }
 237
 238 /* Like 'node_set_text()', but takes in a 'tchar' string.  */
 239 static int
 240 node_set_ttext(xmlNode *node, const tchar *ttext)
 241 {
 242         const xmlChar *text;
 243         int ret;
 244
 245         ret = tstr_get_utf8(ttext, &text);
 246         if (ret)
 247                 return ret;
 248         ret = node_set_text(node, text);
 249         tstr_put_utf8(text);
 250         return ret;
 251 }
 252
 253 /* Create a new element containing text and optionally link it into a tree.  */
 254 static xmlNode *
 255 new_element_with_text(xmlNode *parent, const xmlChar *name, const xmlChar *text)
 256 {
 257         xmlNode *node;
 258
 259         node = xmlNewNode(NULL, name);
 260         if (!node)
 261                 return NULL;
 262
 263         if (node_set_text(node, text)) {
 264                 xmlFreeNode(node);
 265                 return NULL;
 266         }
 267
 268         if (parent)
 269                 xmlAddChild(parent, node);
 270         return node;
 271 }
 272
 273 /* Create a new element containing text and optionally link it into a tree.  */
 274 static int
 275 new_element_with_ttext(xmlNode *parent, const xmlChar *name, const tchar *ttext,
 276                        xmlNode **node_ret)
 277 {
 278         const xmlChar *text;
 279         int ret;
 280         xmlNode *node;
 281
 282         ret = tstr_get_utf8(ttext, &text);
 283         if (ret)
 284                 return ret;
 285         node = new_element_with_text(parent, name, text);
 286         tstr_put_utf8(text);
 287         if (!node)
 288                 return WIMLIB_ERR_NOMEM;
 289         if (node_ret)
 290                 *node_ret = node;
 291         return 0;
 292 }
 293
 294 /* Create a new timestamp element and optionally link it into a tree.  */
 295 static xmlNode *
 296 new_element_with_timestamp(xmlNode *parent, const xmlChar *name, u64 timestamp)
 297 {
 298         xmlNode *node;
 299         char buf[32];
 300
 301         node = xmlNewNode(NULL, name);
 302         if (!node)
 303                 goto err;
 304
 305         sprintf(buf, "0x%08"PRIX32, (u32)(timestamp >> 32));
 306         if (!new_element_with_text(node, "HIGHPART", buf))
 307                 goto err;
 308
 309         sprintf(buf, "0x%08"PRIX32, (u32)timestamp);
 310         if (!new_element_with_text(node, "LOWPART", buf))
 311                 goto err;
 312
 313         if (parent)
 314                 xmlAddChild(parent, node);
 315         return node;
 316
 317 err:
 318         xmlFreeNode(node);
 319         return NULL;
 320 }
 321
 322 /* Create a new number element and optionally link it into a tree.  */
 323 static xmlNode *
 324 new_element_with_u64(xmlNode *parent, const xmlChar *name, u64 value)
 325 {
 326         char buf[32];
 327
 328         sprintf(buf, "%"PRIu64, value);
 329         return new_element_with_text(parent, name, buf);
 330 }
 331
 332 /* Allocate a 'struct wim_xml_info'.  The caller is responsible for initializing
 333  * the document and the images array.  */
 334 static struct wim_xml_info *
 335 alloc_wim_xml_info(void)
 336 {
 337         struct wim_xml_info *info = MALLOC(sizeof(*info));
 338         if (info) {
 339                 info->next_string_idx = 0;
 340                 info->num_strings = 0;
 341         }
 342         return info;
 343 }
 344
 345 static int
 346 do_xml_path_walk(xmlNode *node, const xmlChar *path, bool create,
 347                  xmlNode **result_ret)
 348 {
 349         size_t n = strlen(path) + 1;
 350         xmlChar buf[n];
 351         xmlChar *p;
 352         xmlChar c;
 353
 354         *result_ret = NULL;
 355
 356         if (!node)
 357                 return 0;
 358
 359         /* Copy the path to a temporary buffer.  */
 360         memcpy(buf, path, n);
 361         p = buf;
 362
 363         if (*p == '/')
 364                 goto bad_syntax;
 365         if (strchr(p, '[')) /* reserved for future use */
 366                 goto bad_syntax;
 367         c = *p;
 368
 369         while (c != '\0') {
 370                 const xmlChar *name;
 371                 xmlNode *child;
 372
 373                 /* We have another path component.  */
 374
 375                 /* Parse the element name.  */
 376                 name = p;
 377                 while (*p != '/' && *p != '\0')
 378                         p++;
 379                 if (p == name) /* empty name?  */
 380                         goto bad_syntax;
 381                 c = *p;
 382                 *p = '\0';
 383
 384                 /* Look for a matching child.  */
 385                 node_for_each_child(node, child)
 386                         if (node_is_element(child, name))
 387                                 goto next_step;
 388
 389                 /* No child matched the path.  If create=false, the lookup
 390                  * failed.  If create=true, create the needed element.  */
 391                 if (!create)
 392                         return 0;
 393                 child = xmlNewChild(node, NULL, name, NULL);
 394                 if (!child)
 395                         return WIMLIB_ERR_NOMEM;
 396         next_step:
 397                 /* Continue to the next path component, if there is one.  */
 398                 node = child;
 399                 p++;
 400         }
 401
 402         *result_ret = node;
 403         return 0;
 404
 405 bad_syntax:
 406         ERROR("The XML path \"%s\" has invalid syntax.", path);
 407         return WIMLIB_ERR_INVALID_PARAM;
 408 }
 409
 410 /* Retrieve the XML element, if any, at the specified 'path'.  This supports a
 411  * simple filesystem-like syntax.  If the element was found, returns a pointer
 412  * to it; otherwise returns NULL.  */
 413 static xmlNode *
 414 xml_get_node_by_path(xmlNode *root, const xmlChar *path)
 415 {
 416         xmlNode *node;
 417         do_xml_path_walk(root, path, false, &node);
 418         return node;
 419 }
 420
 421 /* Similar to xml_get_node_by_path(), but creates the element and any requisite
 422  * ancestor elements as needed.   If successful, 0 is returned and *node_ret is
 423  * set to a pointer to the resulting element.  If unsuccessful, an error code is
 424  * returned and *node_ret is set to NULL.  */
 425 static int
 426 xml_ensure_node_by_path(xmlNode *root, const xmlChar *path, xmlNode **node_ret)
 427 {
 428         return do_xml_path_walk(root, path, true, node_ret);
 429 }
 430
 431 static u64
 432 xml_get_number_by_path(xmlNode *root, const xmlChar *path)
 433 {
 434         return node_get_number(xml_get_node_by_path(root, path), 10);
 435 }
 436
 437 static u64
 438 xml_get_timestamp_by_path(xmlNode *root, const xmlChar *path)
 439 {
 440         return node_get_timestamp(xml_get_node_by_path(root, path));
 441 }
 442
 443 static const xmlChar *
 444 xml_get_text_by_path(xmlNode *root, const xmlChar *path)
 445 {
 446         return node_get_text(xml_get_node_by_path(root, path));
 447 }
 448
 449 static const tchar *
 450 xml_get_ttext_by_path(struct wim_xml_info *info, xmlNode *root,
 451                       const xmlChar *path)
 452 {
 453         return node_get_ttext(info, xml_get_node_by_path(root, path));
 454 }
 455
 456 /* Creates/replaces (if ttext is not NULL and not empty) or removes (if ttext is
 457  * NULL or empty) an element containing text.  */
 458 static int
 459 xml_set_ttext_by_path(xmlNode *root, const xmlChar *path, const tchar *ttext)
 460 {
 461         int ret;
 462         xmlNode *node;
 463
 464         if (ttext && *ttext) {
 465                 /* Create or replace  */
 466                 ret = xml_ensure_node_by_path(root, path, &node);
 467                 if (ret)
 468                         return ret;
 469                 return node_set_ttext(node, ttext);
 470         } else {
 471                 /* Remove  */
 472                 node = xml_get_node_by_path(root, path);
 473                 if (node)
 474                         unlink_and_free_tree(node);
 475                 return 0;
 476         }
 477 }
 478
 479 /* Sets a string property for the specified WIM image.  */
 480 static int
 481 set_image_property(WIMStruct *wim, int image, const xmlChar *name,
 482                    const tchar *value)
 483 {
 484         struct wim_xml_info *info = wim->xml_info;
 485
 486         if (image < 1 || image > info->image_count)
 487                 return WIMLIB_ERR_INVALID_IMAGE;
 488
 489         return xml_set_ttext_by_path(info->images[image - 1], name, value);
 490 }
 491
 492 /* Gets a string property for the specified WIM image as a 'tchar' string.
 493  * Returns a pointer to the property value if found; NULL if the image doesn't
 494  * exist; or 'default_value' if the property doesn't exist in the image or if
 495  * the property value could not be translated to a 'tchar' string.  */
 496 static const tchar *
 497 get_image_property(const WIMStruct *wim, int image, const xmlChar *name,
 498                    const tchar *default_value)
 499 {
 500         struct wim_xml_info *info = wim->xml_info;
 501         const tchar *value;
 502
 503         if (image < 1 || image > info->image_count)
 504                 return NULL;
 505
 506         value = xml_get_ttext_by_path(info, info->images[image - 1], name);
 507         return value ? value : default_value;
 508 }
 509
 510 /* Unlink and return the node which represents the INDEX attribute of the
 511  * specified IMAGE element.  */
 512 static xmlAttr *
 513 unlink_index_attribute(xmlNode *image_node)
 514 {
 515         xmlAttr *attr = xmlHasProp(image_node, "INDEX");
 516         xmlUnlinkNode((xmlNode *)attr);
 517         return attr;
 518 }
 519
 520 /* Compute the total uncompressed size of the streams of the specified inode. */
 521 static u64
 522 inode_sum_stream_sizes(const struct wim_inode *inode,
 523                        const struct blob_table *blob_table)
 524 {
 525         u64 total_size = 0;
 526
 527         for (unsigned i = 0; i < inode->i_num_streams; i++) {
 528                 const struct blob_descriptor *blob;
 529
 530                 blob = stream_blob(&inode->i_streams[i], blob_table);
 531                 if (blob)
 532                         total_size += blob->size;
 533         }
 534         return total_size;
 535 }
 536
 537 static int
 538 append_image_node(struct wim_xml_info *info, xmlNode *image_node)
 539 {
 540         char buf[32];
 541         xmlNode **images;
 542
 543         /* Limit exceeded?  */
 544         if (unlikely(info->image_count >= MAX_IMAGES))
 545                 return WIMLIB_ERR_IMAGE_COUNT;
 546
 547         /* Add the INDEX attribute.  */
 548         sprintf(buf, "%d", info->image_count + 1);
 549         if (!xmlNewProp(image_node, "INDEX", buf))
 550                 return WIMLIB_ERR_NOMEM;
 551
 552         /* Append the IMAGE element to the 'images' array.  */
 553         images = REALLOC(info->images,
 554                          (info->image_count + 1) * sizeof(info->images[0]));
 555         if (unlikely(!images))
 556                 return WIMLIB_ERR_NOMEM;
 557         info->images = images;
 558         images[info->image_count++] = image_node;
 559
 560         /* Add the IMAGE element to the document.  */
 561         xmlAddChild(info->root, image_node);
 562         return 0;
 563 }
 564
 565 /*----------------------------------------------------------------------------*
 566  *                     Functions for internal library use                     *
 567  *----------------------------------------------------------------------------*/
 568
 569 /* Allocate an empty 'struct wim_xml_info', containing no images.  */
 570 struct wim_xml_info *
 571 xml_new_info_struct(void)
 572 {
 573         struct wim_xml_info *info;
 574
 575         info = alloc_wim_xml_info();
 576         if (!info)
 577                 goto err;
 578
 579         info->doc = xmlNewDoc("1.0");
 580         if (!info->doc)
 581                 goto err_free_info;
 582
 583         info->root = xmlNewNode(NULL, "WIM");
 584         if (!info->root)
 585                 goto err_free_doc;
 586         xmlDocSetRootElement(info->doc, info->root);
 587
 588         info->images = NULL;
 589         info->image_count = 0;
 590         return info;
 591
 592 err_free_doc:
 593         xmlFreeDoc(info->doc);
 594 err_free_info:
 595         FREE(info);
 596 err:
 597         return NULL;
 598 }
 599
 600 /* Free a 'struct wim_xml_info'.  */
 601 void
 602 xml_free_info_struct(struct wim_xml_info *info)
 603 {
 604         if (info) {
 605                 xmlFreeDoc(info->doc);
 606                 FREE(info->images);
 607                 for (size_t i = 0; i < info->num_strings; i++)
 608                         FREE(info->strings[i]);
 609                 FREE(info);
 610         }
 611 }
 612
 613 /* Retrieve the number of images for which there exist IMAGE elements in the XML
 614  * document.  */
 615 int
 616 xml_get_image_count(const struct wim_xml_info *info)
 617 {
 618         return info->image_count;
 619 }
 620
 621 /* Retrieve the TOTALBYTES value for the WIM file, or 0 if this value is
 622  * unavailable.  */
 623 u64
 624 xml_get_total_bytes(const struct wim_xml_info *info)
 625 {
 626         return xml_get_number_by_path(info->root, "TOTALBYTES");
 627 }
 628
 629 /* Retrieve the TOTALBYTES value for the specified image, or 0 if this value is
 630  * unavailable.  */
 631 u64
 632 xml_get_image_total_bytes(const struct wim_xml_info *info, int image)
 633 {
 634         return xml_get_number_by_path(info->images[image - 1], "TOTALBYTES");
 635 }
 636
 637 /* Retrieve the HARDLINKBYTES value for the specified image, or 0 if this value
 638  * is unavailable.  */
 639 u64
 640 xml_get_image_hard_link_bytes(const struct wim_xml_info *info, int image)
 641 {
 642         return xml_get_number_by_path(info->images[image - 1], "HARDLINKBYTES");
 643 }
 644
 645 /* Retrieve the WIMBOOT value for the specified image, or false if this value is
 646  * unavailable.  */
 647 bool
 648 xml_get_wimboot(const struct wim_xml_info *info, int image)
 649 {
 650         return xml_get_number_by_path(info->images[image - 1], "WIMBOOT");
 651 }
 652
 653 /* Retrieve the Windows build number for the specified image, or 0 if this
 654  * information is not available.  */
 655 u64
 656 xml_get_windows_build_number(const struct wim_xml_info *info, int image)
 657 {
 658         return xml_get_number_by_path(info->images[image - 1],
 659                                       "WINDOWS/VERSION/BUILD");
 660 }
 661
 662 /* Set the WIMBOOT value for the specified image.  */
 663 int
 664 xml_set_wimboot(struct wim_xml_info *info, int image)
 665 {
 666         return xml_set_ttext_by_path(info->images[image - 1], "WIMBOOT", T("1"));
 667 }
 668
 669 /*
 670  * Update the DIRCOUNT, FILECOUNT, TOTALBYTES, HARDLINKBYTES, and
 671  * LASTMODIFICATIONTIME elements for the specified WIM image.
 672  *
 673  * Note: since these stats are likely to be used for display purposes only, we
 674  * no longer attempt to duplicate WIMGAPI's weird bugs when calculating them.
 675  */
 676 int
 677 xml_update_image_info(WIMStruct *wim, int image)
 678 {
 679         const struct wim_image_metadata *imd = wim->image_metadata[image - 1];
 680         xmlNode *image_node = wim->xml_info->images[image - 1];
 681         const struct wim_inode *inode;
 682         u64 dir_count = 0;
 683         u64 file_count = 0;
 684         u64 total_bytes = 0;
 685         u64 hard_link_bytes = 0;
 686         u64 size;
 687         xmlNode *dircount_node;
 688         xmlNode *filecount_node;
 689         xmlNode *totalbytes_node;
 690         xmlNode *hardlinkbytes_node;
 691         xmlNode *lastmodificationtime_node;
 692
 693         image_for_each_inode(inode, imd) {
 694                 if (inode_is_directory(inode))
 695                         dir_count += inode->i_nlink;
 696                 else
 697                         file_count += inode->i_nlink;
 698                 size = inode_sum_stream_sizes(inode, wim->blob_table);
 699                 total_bytes += size * inode->i_nlink;
 700                 hard_link_bytes += size * (inode->i_nlink - 1);
 701         }
 702
 703         dircount_node = new_element_with_u64(NULL, "DIRCOUNT", dir_count);
 704         filecount_node = new_element_with_u64(NULL, "FILECOUNT", file_count);
 705         totalbytes_node = new_element_with_u64(NULL, "TOTALBYTES", total_bytes);
 706         hardlinkbytes_node = new_element_with_u64(NULL, "HARDLINKBYTES",
 707                                                   hard_link_bytes);
 708         lastmodificationtime_node =
 709                 new_element_with_timestamp(NULL, "LASTMODIFICATIONTIME",
 710                                            now_as_wim_timestamp());
 711
 712         if (unlikely(!dircount_node || !filecount_node || !totalbytes_node ||
 713                      !hardlinkbytes_node || !lastmodificationtime_node)) {
 714                 xmlFreeNode(dircount_node);
 715                 xmlFreeNode(filecount_node);
 716                 xmlFreeNode(totalbytes_node);
 717                 xmlFreeNode(hardlinkbytes_node);
 718                 xmlFreeNode(lastmodificationtime_node);
 719                 WARNING("Failed to update image information!");
 720                 return WIMLIB_ERR_NOMEM;
 721         }
 722
 723         node_replace_child_element(image_node, dircount_node);
 724         node_replace_child_element(image_node, filecount_node);
 725         node_replace_child_element(image_node, totalbytes_node);
 726         node_replace_child_element(image_node, hardlinkbytes_node);
 727         node_replace_child_element(image_node, lastmodificationtime_node);
 728         return 0;
 729 }
 730
 731 /* Add an image to the XML information. */
 732 int
 733 xml_add_image(struct wim_xml_info *info, const tchar *name)
 734 {
 735         const u64 now = now_as_wim_timestamp();
 736         xmlNode *image_node;
 737         int ret;
 738
 739         ret = WIMLIB_ERR_NOMEM;
 740         image_node = xmlNewNode(NULL, "IMAGE");
 741         if (!image_node)
 742                 goto err;
 743
 744         if (name && *name) {
 745                 ret = new_element_with_ttext(image_node, "NAME", name, NULL);
 746                 if (ret)
 747                         goto err;
 748         }
 749         ret = WIMLIB_ERR_NOMEM;
 750         if (!new_element_with_u64(image_node, "DIRCOUNT", 0))
 751                 goto err;
 752         if (!new_element_with_u64(image_node, "FILECOUNT", 0))
 753                 goto err;
 754         if (!new_element_with_u64(image_node, "TOTALBYTES", 0))
 755                 goto err;
 756         if (!new_element_with_u64(image_node, "HARDLINKBYTES", 0))
 757                 goto err;
 758         if (!new_element_with_timestamp(image_node, "CREATIONTIME", now))
 759                 goto err;
 760         if (!new_element_with_timestamp(image_node, "LASTMODIFICATIONTIME", now))
 761                 goto err;
 762         ret = append_image_node(info, image_node);
 763         if (ret)
 764                 goto err;
 765         return 0;
 766
 767 err:
 768         xmlFreeNode(image_node);
 769         return ret;
 770 }
 771
 772 /*
 773  * Make a copy of the XML information for the image with index @src_image in the
 774  * @src_info XML document and append it to the @dest_info XML document.
 775  *
 776  * In the process, change the image's name and description to the values
 777  * specified by @dest_image_name and @dest_image_description.  Either or both
 778  * may be NULL, which indicates that the corresponding element will not be
 779  * included in the destination image.
 780  */
 781 int
 782 xml_export_image(const struct wim_xml_info *src_info, int src_image,
 783                  struct wim_xml_info *dest_info, const tchar *dest_image_name,
 784                  const tchar *dest_image_description, bool wimboot)
 785 {
 786         xmlNode *dest_node;
 787         int ret;
 788
 789         ret = WIMLIB_ERR_NOMEM;
 790         dest_node = xmlDocCopyNode(src_info->images[src_image - 1],
 791                                    dest_info->doc, 1);
 792         if (!dest_node)
 793                 goto err;
 794
 795         ret = xml_set_ttext_by_path(dest_node, "NAME", dest_image_name);
 796         if (ret)
 797                 goto err;
 798
 799         ret = xml_set_ttext_by_path(dest_node, "DESCRIPTION",
 800                                     dest_image_description);
 801         if (ret)
 802                 goto err;
 803
 804         if (wimboot) {
 805                 ret = xml_set_ttext_by_path(dest_node, "WIMBOOT", T("1"));
 806                 if (ret)
 807                         goto err;
 808         }
 809
 810         xmlFreeProp(unlink_index_attribute(dest_node));
 811
 812         return append_image_node(dest_info, dest_node);
 813
 814 err:
 815         xmlFreeNode(dest_node);
 816         return ret;
 817 }
 818
 819 /* Remove the specified image from the XML document.  */
 820 void
 821 xml_delete_image(struct wim_xml_info *info, int image)
 822 {
 823         xmlNode *next_image;
 824         xmlAttr *index_attr, *next_index_attr;
 825
 826         /* Free the IMAGE element for the deleted image.  Then, shift all
 827          * higher-indexed IMAGE elements down by 1, in the process re-assigning
 828          * their INDEX attributes.  */
 829
 830         next_image = info->images[image - 1];
 831         next_index_attr = unlink_index_attribute(next_image);
 832         unlink_and_free_tree(next_image);
 833
 834         while (image < info->image_count) {
 835                 index_attr = next_index_attr;
 836                 next_image = info->images[image];
 837                 next_index_attr = unlink_index_attribute(next_image);
 838                 xmlAddChild(next_image, (xmlNode *)index_attr);
 839                 info->images[image - 1] = next_image;
 840                 image++;
 841         }
 842
 843         xmlFreeProp(next_index_attr);
 844         info->image_count--;
 845 }
 846
 847 /* Architecture constants are from w64 mingw winnt.h  */
 848 #define PROCESSOR_ARCHITECTURE_INTEL            0
 849 #define PROCESSOR_ARCHITECTURE_MIPS             1
 850 #define PROCESSOR_ARCHITECTURE_ALPHA            2
 851 #define PROCESSOR_ARCHITECTURE_PPC              3
 852 #define PROCESSOR_ARCHITECTURE_SHX              4
 853 #define PROCESSOR_ARCHITECTURE_ARM              5
 854 #define PROCESSOR_ARCHITECTURE_IA64             6
 855 #define PROCESSOR_ARCHITECTURE_ALPHA64          7
 856 #define PROCESSOR_ARCHITECTURE_MSIL             8
 857 #define PROCESSOR_ARCHITECTURE_AMD64            9
 858 #define PROCESSOR_ARCHITECTURE_IA32_ON_WIN64    10
 859
 860 static const tchar *
 861 describe_arch(u64 arch)
 862 {
 863         static const tchar * const descriptions[] = {
 864                 [PROCESSOR_ARCHITECTURE_INTEL] = T("x86"),
 865                 [PROCESSOR_ARCHITECTURE_MIPS]  = T("MIPS"),
 866                 [PROCESSOR_ARCHITECTURE_ARM]   = T("ARM"),
 867                 [PROCESSOR_ARCHITECTURE_IA64]  = T("ia64"),
 868                 [PROCESSOR_ARCHITECTURE_AMD64] = T("x86_64"),
 869         };
 870
 871         if (arch < ARRAY_LEN(descriptions) && descriptions[arch] != NULL)
 872                 return descriptions[arch];
 873
 874         return T("unknown");
 875 }
 876
 877 /* Print information from the WINDOWS element, if present.  */
 878 static void
 879 print_windows_info(struct wim_xml_info *info, xmlNode *image_node)
 880 {
 881         xmlNode *windows_node;
 882         xmlNode *langs_node;
 883         xmlNode *version_node;
 884         const tchar *text;
 885
 886         windows_node = xml_get_node_by_path(image_node, "WINDOWS");
 887         if (!windows_node)
 888                 return;
 889
 890         tprintf(T("Architecture:           %"TS"\n"),
 891                 describe_arch(xml_get_number_by_path(windows_node, "ARCH")));
 892
 893         text = xml_get_ttext_by_path(info, windows_node, "PRODUCTNAME");
 894         if (text)
 895                 tprintf(T("Product Name:           %"TS"\n"), text);
 896
 897         text = xml_get_ttext_by_path(info, windows_node, "EDITIONID");
 898         if (text)
 899                 tprintf(T("Edition ID:             %"TS"\n"), text);
 900
 901         text = xml_get_ttext_by_path(info, windows_node, "INSTALLATIONTYPE");
 902         if (text)
 903                 tprintf(T("Installation Type:      %"TS"\n"), text);
 904
 905         text = xml_get_ttext_by_path(info, windows_node, "HAL");
 906         if (text)
 907                 tprintf(T("HAL:                    %"TS"\n"), text);
 908
 909         text = xml_get_ttext_by_path(info, windows_node, "PRODUCTTYPE");
 910         if (text)
 911                 tprintf(T("Product Type:           %"TS"\n"), text);
 912
 913         text = xml_get_ttext_by_path(info, windows_node, "PRODUCTSUITE");
 914         if (text)
 915                 tprintf(T("Product Suite:          %"TS"\n"), text);
 916
 917         langs_node = xml_get_node_by_path(windows_node, "LANGUAGES");
 918         if (langs_node) {
 919                 xmlNode *lang_node;
 920
 921                 tprintf(T("Languages:              "));
 922                 node_for_each_child(langs_node, lang_node) {
 923                         if (!node_is_element(lang_node, "LANGUAGE"))
 924                                 continue;
 925                         text = node_get_ttext(info, lang_node);
 926                         if (!text)
 927                                 continue;
 928                         tprintf(T("%"TS" "), text);
 929                 }
 930                 tputchar(T('\n'));
 931
 932                 text = xml_get_ttext_by_path(info, langs_node, "DEFAULT");
 933                 if (text)
 934                         tprintf(T("Default Language:       %"TS"\n"), text);
 935         }
 936
 937         text = xml_get_ttext_by_path(info, windows_node, "SYSTEMROOT");
 938         if (text)
 939                 tprintf(T("System Root:            %"TS"\n"), text);
 940
 941         version_node = xml_get_node_by_path(windows_node, "VERSION");
 942         if (version_node) {
 943                 tprintf(T("Major Version:          %"PRIu64"\n"),
 944                         xml_get_number_by_path(version_node, "MAJOR"));
 945                 tprintf(T("Minor Version:          %"PRIu64"\n"),
 946                         xml_get_number_by_path(version_node, "MINOR"));
 947                 tprintf(T("Build:                  %"PRIu64"\n"),
 948                         xml_get_number_by_path(version_node, "BUILD"));
 949                 tprintf(T("Service Pack Build:     %"PRIu64"\n"),
 950                         xml_get_number_by_path(version_node, "SPBUILD"));
 951                 tprintf(T("Service Pack Level:     %"PRIu64"\n"),
 952                         xml_get_number_by_path(version_node, "SPLEVEL"));
 953         }
 954 }
 955
 956 /* Prints information about the specified image.  */
 957 void
 958 xml_print_image_info(struct wim_xml_info *info, int image)
 959 {
 960         xmlNode * const image_node = info->images[image - 1];
 961         const tchar *text;
 962         tchar timebuf[64];
 963
 964         tprintf(T("Index:                  %d\n"), image);
 965
 966         /* Always print the Name and Description, even if the corresponding XML
 967          * elements are not present.  */
 968         text = xml_get_ttext_by_path(info, image_node, "NAME");
 969         tprintf(T("Name:                   %"TS"\n"), text ? text : T(""));
 970         text = xml_get_ttext_by_path(info, image_node, "DESCRIPTION");
 971         tprintf(T("Description:            %"TS"\n"), text ? text : T(""));
 972
 973         text = xml_get_ttext_by_path(info, image_node, "DISPLAYNAME");
 974         if (text)
 975                 tprintf(T("Display Name:           %"TS"\n"), text);
 976
 977         text = xml_get_ttext_by_path(info, image_node, "DISPLAYDESCRIPTION");
 978         if (text)
 979                 tprintf(T("Display Description:    %"TS"\n"), text);
 980
 981         tprintf(T("Directory Count:        %"PRIu64"\n"),
 982                 xml_get_number_by_path(image_node, "DIRCOUNT"));
 983
 984         tprintf(T("File Count:             %"PRIu64"\n"),
 985                 xml_get_number_by_path(image_node, "FILECOUNT"));
 986
 987         tprintf(T("Total Bytes:            %"PRIu64"\n"),
 988                 xml_get_number_by_path(image_node, "TOTALBYTES"));
 989
 990         tprintf(T("Hard Link Bytes:        %"PRIu64"\n"),
 991                 xml_get_number_by_path(image_node, "HARDLINKBYTES"));
 992
 993         wim_timestamp_to_str(xml_get_timestamp_by_path(image_node,
 994                                                        "CREATIONTIME"),
 995                              timebuf, ARRAY_LEN(timebuf));
 996         tprintf(T("Creation Time:          %"TS"\n"), timebuf);
 997
 998         wim_timestamp_to_str(xml_get_timestamp_by_path(image_node,
 999                                                        "LASTMODIFICATIONTIME"),
1000                              timebuf, ARRAY_LEN(timebuf));
1001         tprintf(T("Last Modification Time: %"TS"\n"), timebuf);
1002
1003         print_windows_info(info, image_node);
1004
1005         text = xml_get_ttext_by_path(info, image_node, "FLAGS");
1006         if (text)
1007                 tprintf(T("Flags:                  %"TS"\n"), text);
1008
1009         tprintf(T("WIMBoot compatible:     %"TS"\n"),
1010                 xml_get_number_by_path(image_node, "WIMBOOT") ?
1011                         T("yes") : T("no"));
1012
1013         tputchar('\n');
1014 }
1015
1016 /*----------------------------------------------------------------------------*
1017  *                      Reading and writing the XML data                      *
1018  *----------------------------------------------------------------------------*/
1019
1020 static int
1021 image_node_get_index(const xmlNode *node)
1022 {
1023         u64 v = node_get_number((const xmlNode *)xmlHasProp(node, "INDEX"), 10);
1024         return min(v, INT_MAX);
1025 }
1026
1027 /* Prepare the 'images' array from the XML document tree.  */
1028 static int
1029 setup_images(struct wim_xml_info *info, xmlNode *root)
1030 {
1031         xmlNode *child;
1032         int index;
1033         int max_index = 0;
1034         int ret;
1035
1036         info->images = NULL;
1037         info->image_count = 0;
1038
1039         node_for_each_child(root, child) {
1040                 if (!node_is_element(child, "IMAGE"))
1041                         continue;
1042                 index = image_node_get_index(child);
1043                 if (unlikely(index < 1 || info->image_count >= MAX_IMAGES))
1044                         goto err_indices;
1045                 max_index = max(max_index, index);
1046                 info->image_count++;
1047         }
1048         if (unlikely(max_index != info->image_count))
1049                 goto err_indices;
1050         ret = WIMLIB_ERR_NOMEM;
1051         info->images = CALLOC(info->image_count, sizeof(info->images[0]));
1052         if (unlikely(!info->images))
1053                 goto err;
1054         node_for_each_child(root, child) {
1055                 if (!node_is_element(child, "IMAGE"))
1056                         continue;
1057                 index = image_node_get_index(child);
1058                 if (unlikely(info->images[index - 1]))
1059                         goto err_indices;
1060                 info->images[index - 1] = child;
1061         }
1062         return 0;
1063
1064 err_indices:
1065         ERROR("The WIM file's XML document does not contain exactly one IMAGE "
1066               "element per image!");
1067         ret = WIMLIB_ERR_XML;
1068 err:
1069         FREE(info->images);
1070         return ret;
1071 }
1072
1073 /* Reads the XML data from a WIM file.  */
1074 int
1075 read_wim_xml_data(WIMStruct *wim)
1076 {
1077         struct wim_xml_info *info;
1078         void *buf;
1079         size_t bufsize;
1080         xmlDoc *doc;
1081         xmlNode *root;
1082         int ret;
1083
1084         /* Allocate the 'struct wim_xml_info'.  */
1085         ret = WIMLIB_ERR_NOMEM;
1086         info = alloc_wim_xml_info();
1087         if (!info)
1088                 goto err;
1089
1090         /* Read the raw UTF-16LE bytes.  */
1091         ret = wimlib_get_xml_data(wim, &buf, &bufsize);
1092         if (ret)
1093                 goto err_free_info;
1094
1095         /* Parse the document with libxml2, creating the document tree.  */
1096         doc = xmlReadMemory(buf, bufsize, NULL, "UTF-16LE", XML_PARSE_NONET);
1097         FREE(buf);
1098         buf = NULL;
1099         if (!doc) {
1100                 ERROR("Unable to parse the WIM file's XML document!");
1101                 ret = WIMLIB_ERR_XML;
1102                 goto err_free_info;
1103         }
1104
1105         /* Verify the root element.  */
1106         root = xmlDocGetRootElement(doc);
1107         if (!node_is_element(root, "WIM")) {
1108                 ERROR("The WIM file's XML document has an unexpected format!");
1109                 ret = WIMLIB_ERR_XML;
1110                 goto err_free_doc;
1111         }
1112
1113         /* Verify the WIM file is not encrypted.  */
1114         if (xml_get_node_by_path(root, "ESD/ENCRYPTED")) {
1115                 ret = WIMLIB_ERR_WIM_IS_ENCRYPTED;
1116                 goto err_free_doc;
1117         }
1118
1119         /* Validate the image elements and set up the images[] array.  */
1120         ret = setup_images(info, root);
1121         if (ret)
1122                 goto err_free_doc;
1123
1124         /* Save the document and return.  */
1125         info->doc = doc;
1126         info->root = root;
1127         wim->xml_info = info;
1128         return 0;
1129
1130 err_free_doc:
1131         xmlFreeDoc(doc);
1132 err_free_info:
1133         FREE(info);
1134 err:
1135         return ret;
1136 }
1137
1138 /* Swap the INDEX attributes of two IMAGE elements.  */
1139 static void
1140 swap_index_attributes(xmlNode *image_node_1, xmlNode *image_node_2)
1141 {
1142         xmlAttr *attr_1, *attr_2;
1143
1144         if (image_node_1 != image_node_2) {
1145                 attr_1 = unlink_index_attribute(image_node_1);
1146                 attr_2 = unlink_index_attribute(image_node_2);
1147                 xmlAddChild(image_node_1, (xmlNode *)attr_2);
1148                 xmlAddChild(image_node_2, (xmlNode *)attr_1);
1149         }
1150 }
1151
1152 static int
1153 prepare_document_for_write(struct wim_xml_info *info, int image, u64 total_bytes,
1154                            xmlNode **orig_totalbytes_node_ret)
1155 {
1156         xmlNode *totalbytes_node = NULL;
1157
1158         /* Allocate the new TOTALBYTES element if needed.  */
1159         if (total_bytes != WIM_TOTALBYTES_USE_EXISTING &&
1160             total_bytes != WIM_TOTALBYTES_OMIT) {
1161                 totalbytes_node = new_element_with_u64(NULL, "TOTALBYTES",
1162                                                        total_bytes);
1163                 if (!totalbytes_node)
1164                         return WIMLIB_ERR_NOMEM;
1165         }
1166
1167         /* Adjust the IMAGE elements if needed.  */
1168         if (image != WIMLIB_ALL_IMAGES) {
1169                 /* We're writing a single image only.  Temporarily unlink all
1170                  * other IMAGE elements from the document.  */
1171                 for (int i = 0; i < info->image_count; i++)
1172                         if (i + 1 != image)
1173                                 xmlUnlinkNode(info->images[i]);
1174
1175                 /* Temporarily set the INDEX attribute of the needed IMAGE
1176                  * element to 1.  */
1177                 swap_index_attributes(info->images[0], info->images[image - 1]);
1178         }
1179
1180         /* Adjust (add, change, or remove) the TOTALBYTES element if needed.  */
1181         *orig_totalbytes_node_ret = NULL;
1182         if (total_bytes != WIM_TOTALBYTES_USE_EXISTING) {
1183                 /* Unlink the previous TOTALBYTES element, if any.  */
1184                 *orig_totalbytes_node_ret = xml_get_node_by_path(info->root,
1185                                                                  "TOTALBYTES");
1186                 if (*orig_totalbytes_node_ret)
1187                         xmlUnlinkNode(*orig_totalbytes_node_ret);
1188
1189                 /* Link in the new TOTALBYTES element, if any.  */
1190                 if (totalbytes_node)
1191                         xmlAddChild(info->root, totalbytes_node);
1192         }
1193         return 0;
1194 }
1195
1196 static void
1197 restore_document_after_write(struct wim_xml_info *info, int image,
1198                              xmlNode *orig_totalbytes_node)
1199 {
1200         /* Restore the IMAGE elements if needed.  */
1201         if (image != WIMLIB_ALL_IMAGES) {
1202                 /* We wrote a single image only.  Re-link all other IMAGE
1203                  * elements to the document.  */
1204                 for (int i = 0; i < info->image_count; i++)
1205                         if (i + 1 != image)
1206                                 xmlAddChild(info->root, info->images[i]);
1207
1208                 /* Restore the original INDEX attributes.  */
1209                 swap_index_attributes(info->images[0], info->images[image - 1]);
1210         }
1211
1212         /* Restore the original TOTALBYTES element if needed.  */
1213         if (orig_totalbytes_node)
1214                 node_replace_child_element(info->root, orig_totalbytes_node);
1215 }
1216
1217 /*
1218  * Writes the XML data to a WIM file.
1219  *
1220  * 'image' specifies the image(s) to include in the XML data.  Normally it is
1221  * WIMLIB_ALL_IMAGES, but it can also be a 1-based image index.
1222  *
1223  * 'total_bytes' is the number to use in the top-level TOTALBYTES element, or
1224  * WIM_TOTALBYTES_USE_EXISTING to use the existing value from the XML document
1225  * (if any), or WIM_TOTALBYTES_OMIT to omit the TOTALBYTES element entirely.
1226  */
1227 int
1228 write_wim_xml_data(WIMStruct *wim, int image, u64 total_bytes,
1229                    struct wim_reshdr *out_reshdr, int write_resource_flags)
1230 {
1231         struct wim_xml_info *info = wim->xml_info;
1232         long ret;
1233         long ret2;
1234         xmlBuffer *buffer;
1235         xmlNode *orig_totalbytes_node;
1236         xmlSaveCtxt *save_ctx;
1237
1238         /* Make any needed temporary changes to the document.  */
1239         ret = prepare_document_for_write(info, image, total_bytes,
1240                                          &orig_totalbytes_node);
1241         if (ret)
1242                 goto out;
1243
1244         /* Create an in-memory buffer to hold the encoded document.  */
1245         ret = WIMLIB_ERR_NOMEM;
1246         buffer = xmlBufferCreate();
1247         if (!buffer)
1248                 goto out_restore_document;
1249
1250         /* Encode the document in UTF-16LE, with a byte order mark, and with no
1251          * XML declaration.  Some other WIM software requires all of these
1252          * characteristics.  */
1253         ret = WIMLIB_ERR_NOMEM;
1254         if (xmlBufferCat(buffer, "\xff\xfe"))
1255                 goto out_free_buffer;
1256         save_ctx = xmlSaveToBuffer(buffer, "UTF-16LE", XML_SAVE_NO_DECL);
1257         if (!save_ctx)
1258                 goto out_free_buffer;
1259         ret = xmlSaveDoc(save_ctx, info->doc);
1260         ret2 = xmlSaveClose(save_ctx);
1261         if (ret < 0 || ret2 < 0) {
1262                 ERROR("Unable to serialize the WIM file's XML document!");
1263                 ret = WIMLIB_ERR_NOMEM;
1264                 goto out_free_buffer;
1265         }
1266
1267         /* Write the XML data uncompressed.  Although wimlib can handle
1268          * compressed XML data, some other WIM software cannot.  */
1269         ret = write_wim_resource_from_buffer(xmlBufferContent(buffer),
1270                                              xmlBufferLength(buffer),
1271                                              true,
1272                                              &wim->out_fd,
1273                                              WIMLIB_COMPRESSION_TYPE_NONE,
1274                                              0,
1275                                              out_reshdr,
1276                                              NULL,
1277                                              write_resource_flags);
1278 out_free_buffer:
1279         xmlBufferFree(buffer);
1280 out_restore_document:
1281         /* Revert any temporary changes we made to the document.  */
1282         restore_document_after_write(info, image, orig_totalbytes_node);
1283 out:
1284         return ret;
1285 }
1286
1287 /*----------------------------------------------------------------------------*
1288  *                           Global setup functions                           *
1289  *----------------------------------------------------------------------------*/
1290
1291 void
1292 xml_global_init(void)
1293 {
1294         xmlInitParser();
1295 }
1296
1297 void
1298 xml_global_cleanup(void)
1299 {
1300         xmlCleanupParser();
1301 }
1302
1303 void
1304 xml_set_memory_allocator(void *(*malloc_func)(size_t),
1305                          void (*free_func)(void *),
1306                          void *(*realloc_func)(void *, size_t))
1307 {
1308         xmlMemSetup(free_func, malloc_func, realloc_func, wimlib_strdup);
1309 }
1310
1311 /*----------------------------------------------------------------------------*
1312  *                           Library API functions                            *
1313  *----------------------------------------------------------------------------*/
1314
1315 WIMLIBAPI int
1316 wimlib_get_xml_data(WIMStruct *wim, void **buf_ret, size_t *bufsize_ret)
1317 {
1318         const struct wim_reshdr *xml_reshdr;
1319
1320         if (wim->filename == NULL && filedes_is_seekable(&wim->in_fd))
1321                 return WIMLIB_ERR_NO_FILENAME;
1322
1323         if (buf_ret == NULL || bufsize_ret == NULL)
1324                 return WIMLIB_ERR_INVALID_PARAM;
1325
1326         xml_reshdr = &wim->hdr.xml_data_reshdr;
1327
1328         *bufsize_ret = xml_reshdr->uncompressed_size;
1329         return wim_reshdr_to_data(xml_reshdr, wim, buf_ret);
1330 }
1331
1332 WIMLIBAPI int
1333 wimlib_extract_xml_data(WIMStruct *wim, FILE *fp)
1334 {
1335         int ret;
1336         void *buf;
1337         size_t bufsize;
1338
1339         ret = wimlib_get_xml_data(wim, &buf, &bufsize);
1340         if (ret)
1341                 return ret;
1342
1343         if (fwrite(buf, 1, bufsize, fp) != bufsize) {
1344                 ERROR_WITH_ERRNO("Failed to extract XML data");
1345                 ret = WIMLIB_ERR_WRITE;
1346         }
1347         FREE(buf);
1348         return ret;
1349 }
1350
1351 static bool
1352 image_name_in_use(const WIMStruct *wim, const tchar *name, int excluded_image)
1353 {
1354         const struct wim_xml_info *info = wim->xml_info;
1355         const xmlChar *name_utf8;
1356         bool found = false;
1357
1358         /* Any number of images can have "no name".  */
1359         if (!name || !*name)
1360                 return false;
1361
1362         /* Check for images that have the specified name.  */
1363         if (tstr_get_utf8(name, &name_utf8))
1364                 return false;
1365         for (int i = 0; i < info->image_count && !found; i++) {
1366                 if (i + 1 == excluded_image)
1367                         continue;
1368                 found = xmlStrEqual(name_utf8, xml_get_text_by_path(
1369                                                     info->images[i], "NAME"));
1370         }
1371         tstr_put_utf8(name_utf8);
1372         return found;
1373 }
1374
1375 WIMLIBAPI bool
1376 wimlib_image_name_in_use(const WIMStruct *wim, const tchar *name)
1377 {
1378         return image_name_in_use(wim, name, WIMLIB_NO_IMAGE);
1379 }
1380
1381 WIMLIBAPI const tchar *
1382 wimlib_get_image_name(const WIMStruct *wim, int image)
1383 {
1384         return get_image_property(wim, image, "NAME", T(""));
1385 }
1386
1387 WIMLIBAPI const tchar *
1388 wimlib_get_image_description(const WIMStruct *wim, int image)
1389 {
1390         return get_image_property(wim, image, "DESCRIPTION", NULL);
1391 }
1392
1393 WIMLIBAPI const tchar *
1394 wimlib_get_image_property(const WIMStruct *wim, int image,
1395                           const tchar *property_name)
1396 {
1397         const xmlChar *name;
1398         const tchar *value;
1399
1400         if (!property_name || !*property_name)
1401                 return NULL;
1402         if (tstr_get_utf8(property_name, &name))
1403                 return NULL;
1404         value = get_image_property(wim, image, name, NULL);
1405         tstr_put_utf8(name);
1406         return value;
1407 }
1408
1409 WIMLIBAPI int
1410 wimlib_set_image_name(WIMStruct *wim, int image, const tchar *name)
1411 {
1412         if (image_name_in_use(wim, name, image))
1413                 return WIMLIB_ERR_IMAGE_NAME_COLLISION;
1414
1415         return set_image_property(wim, image, "NAME", name);
1416 }
1417
1418 WIMLIBAPI int
1419 wimlib_set_image_descripton(WIMStruct *wim, int image, const tchar *description)
1420 {
1421         return set_image_property(wim, image, "DESCRIPTION", description);
1422 }
1423
1424 WIMLIBAPI int
1425 wimlib_set_image_flags(WIMStruct *wim, int image, const tchar *flags)
1426 {
1427         return set_image_property(wim, image, "FLAGS", flags);
1428 }
1429
1430 WIMLIBAPI int
1431 wimlib_set_image_property(WIMStruct *wim, int image, const tchar *property_name,
1432                           const tchar *property_value)
1433 {
1434         const xmlChar *name;
1435         int ret;
1436
1437         if (!property_name || !*property_name)
1438                 return WIMLIB_ERR_INVALID_PARAM;
1439
1440         ret = tstr_get_utf8(property_name, &name);
1441         if (ret)
1442                 return ret;
1443         ret = set_image_property(wim, image, name, property_value);
1444         tstr_put_utf8(name);
1445         return ret;
1446 }