X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fwim.c;h=dec3ee96ba0541f1ebc555ac7486a0ecd7f6a2b0;hp=12b8418327eaa79dc596982f77f52f610835091e;hb=fced769402ff6ef0bf75fe9e4dcb2880891469e0;hpb=ef8f45b98b5c4db398321cd36d052ccbb9c3784a

diff --git a/src/wim.c b/src/wim.c
index 12b84183..dec3ee96 100644
--- a/src/wim.c
+++ b/src/wim.c
@@ -1,79 +1,111 @@
 /*
- * wim.c
+ * wim.c - Stuff that doesn't fit into any other file
  */
 
 /*
- * Copyright (C) 2010 Carl Thijssen
- * Copyright (C) 2012 Eric Biggers
- *
- * wimlib - Library for working with WIM files 
+ * Copyright (C) 2012, 2013 Eric Biggers
  *
  * This file is part of wimlib, a library for working with WIM files.
  *
  * wimlib is free software; you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free
- * Software Foundation; either version 2.1 of the License, or (at your option)
+ * terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 3 of the License, or (at your option)
  * any later version.
  *
  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+ * A PARTICULAR PURPOSE. See the GNU General Public License for more
  * details.
  *
- * You should have received a copy of the GNU Lesser General Public License
+ * You should have received a copy of the GNU General Public License
  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  */
 
-#include "wimlib_internal.h"
-#include "io.h"
-#include "lookup_table.h"
-#include "xml.h"
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include "wimlib/error.h"
+#include "wimlib/dentry.h"
+#include "wimlib/encoding.h"
+#include "wimlib/file_io.h"
+#include "wimlib/integrity.h"
+#include "wimlib/lookup_table.h"
+#include "wimlib/metadata.h"
+#ifdef WITH_NTFS_3G
+#  include "wimlib/ntfs_3g.h" /* for do_ntfs_umount() */
+#endif
+#include "wimlib/security.h"
+#include "wimlib/wim.h"
+#include "wimlib/xml.h"
+
+#ifdef __WIN32__
+#  include "wimlib/win32.h" /* for realpath() replacement */
+#endif
+
+#include <errno.h>
+#include <fcntl.h>
+#ifndef __WIN32__
+#  include <langinfo.h>
+#endif
+#include <limits.h>
+#include <stdarg.h>
 #include <stdlib.h>
+#include <unistd.h>
 
-static int print_metadata(WIMStruct *w)
+static int
+image_print_metadata(WIMStruct *w)
 {
-	print_security_data(wim_security_data(w));
-	return for_dentry_in_tree(wim_root_dentry(w), print_dentry, 
+	DEBUG("Printing metadata for image %d", w->current_image);
+	print_wim_security_data(wim_security_data(w));
+	return for_dentry_in_tree(wim_root_dentry(w), print_dentry,
 				  w->lookup_table);
 }
 
 
-static int print_files(WIMStruct *w)
+static int
+image_print_files(WIMStruct *w)
 {
-	return for_dentry_in_tree(wim_root_dentry(w), print_dentry_full_path, 
+	return for_dentry_in_tree(wim_root_dentry(w), print_dentry_full_path,
 				  NULL);
 }
 
-WIMStruct *new_wim_struct()
+static WIMStruct *
+new_wim_struct(void)
 {
-	return CALLOC(1, sizeof(WIMStruct));
+	WIMStruct *w = CALLOC(1, sizeof(WIMStruct));
+	if (w) {
+		w->in_fd = -1;
+		w->out_fd = -1;
+	}
+	return w;
 }
 
-/* 
- * Calls a function on images in the WIM.  If @image is WIM_ALL_IMAGES, @visitor
+/*
+ * Calls a function on images in the WIM.  If @image is WIMLIB_ALL_IMAGES, @visitor
  * is called on the WIM once for each image, with each image selected as the
  * current image in turn.  If @image is a certain image, @visitor is called on
  * the WIM only once, with that image selected.
  */
-int for_image(WIMStruct *w, int image, int (*visitor)(WIMStruct *))
+int
+for_image(WIMStruct *w, int image, int (*visitor)(WIMStruct *))
 {
 	int ret;
-	int i;
+	int start;
 	int end;
+	int i;
 
-	DEBUG("for_image(w = %p, image = %d, visitor = %p)", w, image, visitor);
-
-	if (image == WIM_ALL_IMAGES) {
-		i = 1;
+	if (image == WIMLIB_ALL_IMAGES) {
+		start = 1;
 		end = w->hdr.image_count;
-	} else {
-		if (image < 1 || image > w->hdr.image_count)
-			return WIMLIB_ERR_INVALID_IMAGE;
-		i = image;
+	} else if (image >= 1 && image <= w->hdr.image_count) {
+		start = image;
 		end = image;
+	} else {
+		return WIMLIB_ERR_INVALID_IMAGE;
 	}
-	for (; i <= end; i++) {
-		ret = wimlib_select_image(w, i);
+	for (i = start; i <= end; i++) {
+		ret = select_wim_image(w, i);
 		if (ret != 0)
 			return ret;
 		ret = visitor(w);
@@ -83,79 +115,33 @@ int for_image(WIMStruct *w, int image, int (*visitor)(WIMStruct *))
 	return 0;
 }
 
-static int sort_image_metadata_by_position(const void *p1, const void *p2)
-{
-	struct image_metadata *bmd1 = (struct image_metadata*)p1;
-	struct image_metadata *bmd2 = (struct image_metadata*)p2;
-	u64 offset1 = bmd1->metadata_lte->resource_entry.offset;
-	u64 offset2 = bmd2->metadata_lte->resource_entry.offset;
-	if (offset1 < offset2)
-		return -1;
-	else if (offset1 > offset2)
-		return 1;
-	else
-		return 0;
-}
-
-/* 
- * If @lte points to a metadata resource, append it to the list of metadata
- * resources in the WIMStruct.  Otherwise, do nothing.
- */
-static int append_metadata_resource_entry(struct lookup_table_entry *lte, 
-					  void *wim_p)
-{
-	WIMStruct *w = wim_p;
-
-	if (lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA) {
-		/*fprintf(stderr, "found mlte at %u\n", lte->resource_entry.offset);*/
-		if (w->current_image == w->hdr.image_count) {
-			ERROR("Expected only %u images, but found more",
-			      w->hdr.image_count);
-			return WIMLIB_ERR_IMAGE_COUNT;
-		} else {
-			DEBUG("Found metadata resource for image %u at "
-			      "offset %"PRIu64".",
-			      w->current_image + 1, 
-			      lte->resource_entry.offset);
-			w->image_metadata[
-				w->current_image++].metadata_lte = lte;
-		}
-	}
-	return 0;
-}
-
 /* Returns the compression type given in the flags of a WIM header. */
-int wim_hdr_flags_compression_type(int wim_hdr_flags)
+static int
+wim_hdr_flags_compression_type(int wim_hdr_flags)
 {
 	if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESSION) {
 		if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESS_LZX)
-			return WIM_COMPRESSION_TYPE_LZX;
+			return WIMLIB_COMPRESSION_TYPE_LZX;
 		else if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESS_XPRESS)
-			return WIM_COMPRESSION_TYPE_XPRESS;
+			return WIMLIB_COMPRESSION_TYPE_XPRESS;
 		else
-			return WIM_COMPRESSION_TYPE_INVALID;
+			return WIMLIB_COMPRESSION_TYPE_INVALID;
 	} else {
-		return WIM_COMPRESSION_TYPE_NONE;
+		return WIMLIB_COMPRESSION_TYPE_NONE;
 	}
 }
 
-int wim_resource_compression_type(const WIMStruct *w, 
-				  const struct resource_entry *entry)
-{
-	int wim_ctype = wimlib_get_compression_type(w);
-	return resource_compression_type(wim_ctype, entry->flags);
-}
-
 /*
  * Creates a WIMStruct for a new WIM file.
  */
-WIMLIBAPI int wimlib_create_new_wim(int ctype, WIMStruct **w_ret)
+WIMLIBAPI int
+wimlib_create_new_wim(int ctype, WIMStruct **w_ret)
 {
 	WIMStruct *w;
-	struct lookup_table *table;
+	struct wim_lookup_table *table;
 	int ret;
 
-	DEBUG("Creating new WIM with %s compression.",
+	DEBUG("Creating new WIM with %"TS" compression.",
 	      wimlib_get_compression_type_string(ctype));
 
 	/* Allocate the WIMStruct. */
@@ -173,6 +159,7 @@ WIMLIBAPI int wimlib_create_new_wim(int ctype, WIMStruct **w_ret)
 		goto out_free;
 	}
 	w->lookup_table = table;
+	w->refcnts_ok = 1;
 	*w_ret = w;
 	return 0;
 out_free:
@@ -180,17 +167,25 @@ out_free:
 	return ret;
 }
 
-WIMLIBAPI int wimlib_get_num_images(const WIMStruct *w)
+WIMLIBAPI int
+wimlib_get_num_images(const WIMStruct *w)
 {
 	return w->hdr.image_count;
 }
 
-int wimlib_select_image(WIMStruct *w, int image)
+int
+select_wim_image(WIMStruct *w, int image)
 {
-	struct image_metadata *imd;
+	struct wim_image_metadata *imd;
+	int ret;
 
 	DEBUG("Selecting image %d", image);
 
+	if (image == WIMLIB_NO_IMAGE) {
+		ERROR("Invalid image: %d", WIMLIB_NO_IMAGE);
+		return WIMLIB_ERR_INVALID_IMAGE;
+	}
+
 	if (image == w->current_image)
 		return 0;
 
@@ -200,55 +195,53 @@ int wimlib_select_image(WIMStruct *w, int image)
 		return WIMLIB_ERR_INVALID_IMAGE;
 	}
 
-
 	/* If a valid image is currently selected, it can be freed if it is not
 	 * modified.  */
-	if (w->current_image != WIM_NO_IMAGE) {
+	if (w->current_image != WIMLIB_NO_IMAGE) {
 		imd = wim_get_current_image_metadata(w);
 		if (!imd->modified) {
+			wimlib_assert(list_empty(&imd->unhashed_streams));
 			DEBUG("Freeing image %u", w->current_image);
-			free_dentry_tree(imd->root_dentry, NULL, false);
-			imd->root_dentry = NULL;
-			free_security_data(imd->security_data);
-			imd->security_data = NULL;
+			destroy_image_metadata(imd, NULL, false);
 		}
 	}
-
 	w->current_image = image;
 	imd = wim_get_current_image_metadata(w);
-
-	if (imd->root_dentry) {
-		return 0;
+	if (imd->root_dentry || imd->modified) {
+		ret = 0;
 	} else {
 		#ifdef ENABLE_DEBUG
 		DEBUG("Reading metadata resource specified by the following "
 		      "lookup table entry:");
-		print_lookup_table_entry(imd->metadata_lte, NULL);
+		print_lookup_table_entry(imd->metadata_lte, stderr);
 		#endif
-		return read_metadata_resource(w->fp, 
-					      wimlib_get_compression_type(w), 
-					      imd);
+		ret = read_metadata_resource(w, imd);
+		if (ret)
+			w->current_image = WIMLIB_NO_IMAGE;
 	}
+	return ret;
 }
 
 
 /* Returns the compression type of the WIM file. */
-WIMLIBAPI int wimlib_get_compression_type(const WIMStruct *w)
+WIMLIBAPI int
+wimlib_get_compression_type(const WIMStruct *w)
 {
 	return wim_hdr_flags_compression_type(w->hdr.flags);
 }
 
-WIMLIBAPI const char *wimlib_get_compression_type_string(int ctype)
+WIMLIBAPI const tchar *
+wimlib_get_compression_type_string(int ctype)
 {
 	switch (ctype) {
-		case WIM_COMPRESSION_TYPE_NONE:
-			return "None";
-		case WIM_COMPRESSION_TYPE_LZX:
-			return "LZX";
-		case WIM_COMPRESSION_TYPE_XPRESS:
-			return "XPRESS";
+		case WIMLIB_COMPRESSION_TYPE_NONE:
+			return T("None");
+		case WIMLIB_COMPRESSION_TYPE_LZX:
+			return T("LZX");
+		case WIMLIB_COMPRESSION_TYPE_XPRESS:
+			return T("XPRESS");
 		default:
-			return "Invalid";
+			return T("Invalid");
 	}
 }
 
@@ -257,312 +250,571 @@ WIMLIBAPI const char *wimlib_get_compression_type_string(int ctype)
  * the number of the image, or the name of the image.  The images are numbered
  * starting at 1.
  */
-WIMLIBAPI int wimlib_resolve_image(WIMStruct *w, const char *image_name_or_num)
+WIMLIBAPI int
+wimlib_resolve_image(WIMStruct *w, const tchar *image_name_or_num)
 {
-	char *p;
-	int image;
+	tchar *p;
+	long image;
 	int i;
 
-	if (!image_name_or_num)
-		return WIM_NO_IMAGE;
+	if (!image_name_or_num || !*image_name_or_num)
+		return WIMLIB_NO_IMAGE;
 
-	if (strcmp(image_name_or_num, "all") == 0)
-		return WIM_ALL_IMAGES;
-	image = strtol(image_name_or_num, &p, 10);
-	if (p != image_name_or_num && *p == '\0') {
-		if (image < 1 || image > w->hdr.image_count)
-			return WIM_NO_IMAGE;
+	if (!tstrcasecmp(image_name_or_num, T("all"))
+	    || !tstrcasecmp(image_name_or_num, T("*")))
+		return WIMLIB_ALL_IMAGES;
+	image = tstrtol(image_name_or_num, &p, 10);
+	if (p != image_name_or_num && *p == T('\0') && image > 0) {
+		if (image > w->hdr.image_count)
+			return WIMLIB_NO_IMAGE;
 		return image;
 	} else {
 		for (i = 1; i <= w->hdr.image_count; i++) {
-			if (strcmp(image_name_or_num,
-				   wimlib_get_image_name(w, i)) == 0)
+			if (!tstrcmp(image_name_or_num,
+				     wimlib_get_image_name(w, i)))
 				return i;
 		}
-		return WIM_NO_IMAGE;
+		return WIMLIB_NO_IMAGE;
 	}
 }
 
-
 /* Prints some basic information about a WIM file. */
-WIMLIBAPI void wimlib_print_wim_information(const WIMStruct *w)
+WIMLIBAPI void
+wimlib_print_wim_information(const WIMStruct *w)
 {
 	const struct wim_header *hdr;
-	
+
 	hdr = &w->hdr;
-	puts("WIM Information:");
-	puts("----------------");
-	printf("Path:           %s\n", w->filename);
-	fputs ("GUID:           0x", stdout);
-	print_byte_field(hdr->guid, WIM_GID_LEN);
-	putchar('\n');
-	printf("Image Count:    %d\n", hdr->image_count);
-	printf("Compression:    %s\n", wimlib_get_compression_type_string(
-						wimlib_get_compression_type(w)));
-	printf("Part Number:    %d/%d\n", hdr->part_number, hdr->total_parts);
-	printf("Boot Index:     %d\n", hdr->boot_idx);
-	printf("Size:           %"PRIu64" bytes\n", 
-				wim_info_get_total_bytes(w->wim_info));
-	printf("Integrity Info: %s\n", (w->hdr.integrity.size != 0) ? "yes" : "no");
-	putchar('\n');
-}
-
-WIMLIBAPI bool wimlib_has_integrity_table(const WIMStruct *w)
+	tputs(T("WIM Information:"));
+	tputs(T("----------------"));
+	tprintf(T("Path:           %"TS"\n"), w->filename);
+	tfputs(T("GUID:           0x"), stdout);
+	print_byte_field(hdr->guid, WIM_GID_LEN, stdout);
+	tputchar(T('\n'));
+	tprintf(T("Image Count:    %d\n"), hdr->image_count);
+	tprintf(T("Compression:    %"TS"\n"),
+		wimlib_get_compression_type_string(wimlib_get_compression_type(w)));
+	tprintf(T("Part Number:    %d/%d\n"), hdr->part_number, hdr->total_parts);
+	tprintf(T("Boot Index:     %d\n"), hdr->boot_idx);
+	tprintf(T("Size:           %"PRIu64" bytes\n"),
+		wim_info_get_total_bytes(w->wim_info));
+	tprintf(T("Integrity Info: %"TS"\n"),
+		(w->hdr.integrity.offset != 0) ? T("yes") : T("no"));
+	tprintf(T("Relative path junction: %"TS"\n"),
+		(hdr->flags & WIM_HDR_FLAG_RP_FIX) ? T("yes") : T("no"));
+	tputchar(T('\n'));
+}
+
+WIMLIBAPI bool
+wimlib_has_integrity_table(const WIMStruct *w)
 {
 	return w->hdr.integrity.size != 0;
 }
 
-WIMLIBAPI void wimlib_print_available_images(const WIMStruct *w, int image)
+WIMLIBAPI void
+wimlib_print_available_images(const WIMStruct *w, int image)
 {
-	if (image == WIM_ALL_IMAGES) {
-		puts("Available Images:");
-		puts("-----------------");
+	int first;
+	int last;
+	int i;
+	int n;
+	if (image == WIMLIB_ALL_IMAGES) {
+		n = tprintf(T("Available Images:\n"));
+		first = 1;
+		last = w->hdr.image_count;
+	} else if (image >= 1 && image <= w->hdr.image_count) {
+		n = tprintf(T("Information for Image %d\n"), image);
+		first = image;
+		last = image;
 	} else {
-		int n;
-		int i;
-
-		n = printf("Information for Image %d\n", image);
-		for (i = 0; i < n - 1; i++)
-			putchar('-');
-		putchar('\n');
-
+		tprintf(T("wimlib_print_available_images(): Invalid image %d"),
+			image);
+		return;
 	}
-	print_image_info(w->wim_info, image);
+	for (i = 0; i < n - 1; i++)
+		tputchar(T('-'));
+	tputchar(T('\n'));
+	for (i = first; i <= last; i++)
+		print_image_info(w->wim_info, i);
 }
 
 
-/* Prints the metadata for the specified image, which may be WIM_ALL_IMAGES, but
- * not WIM_NO_IMAGE. */
-WIMLIBAPI int wimlib_print_metadata(WIMStruct *w, int image)
+/* Prints the metadata for the specified image, which may be WIMLIB_ALL_IMAGES, but
+ * not WIMLIB_NO_IMAGE. */
+WIMLIBAPI int
+wimlib_print_metadata(WIMStruct *w, int image)
 {
-	return for_image(w, image, print_metadata);
+	if (w->hdr.part_number != 1) {
+		ERROR("Cannot show the metadata from part %hu of a %hu-part split WIM!",
+		       w->hdr.part_number, w->hdr.total_parts);
+		ERROR("Select the first part of the split WIM to see the metadata.");
+		return WIMLIB_ERR_SPLIT_UNSUPPORTED;
+	}
+	return for_image(w, image, image_print_metadata);
 }
 
-WIMLIBAPI int wimlib_print_files(WIMStruct *w, int image)
+WIMLIBAPI int
+wimlib_print_files(WIMStruct *w, int image)
 {
-	return for_image(w, image, print_files);
+	if (w->hdr.part_number != 1) {
+		ERROR("Cannot list the files from part %hu of a %hu-part split WIM!",
+		       w->hdr.part_number, w->hdr.total_parts);
+		ERROR("Select the first part of the split WIM if you'd like to list the files.");
+		return WIMLIB_ERR_SPLIT_UNSUPPORTED;
+	}
+	return for_image(w, image, image_print_files);
 }
 
 /* Sets the index of the bootable image. */
-WIMLIBAPI int wimlib_set_boot_idx(WIMStruct *w, int boot_idx)
+WIMLIBAPI int
+wimlib_set_boot_idx(WIMStruct *wim, int boot_idx)
 {
-	if (boot_idx < 0 || boot_idx > w->hdr.image_count)
+	int ret;
+
+	ret = can_modify_wim(wim);
+	if (ret)
+		return ret;
+	if (boot_idx < 0 || boot_idx > wim->hdr.image_count)
 		return WIMLIB_ERR_INVALID_IMAGE;
-	w->hdr.boot_idx = boot_idx;
-	if (boot_idx == 0) {
-		memset(&w->hdr.boot_metadata_res_entry, 0, 
-		       sizeof(struct resource_entry));
-	} else {
-		memcpy(&w->hdr.boot_metadata_res_entry,
-		       &w->image_metadata[
-		       		boot_idx - 1].metadata_lte->resource_entry, 
-		       sizeof(struct resource_entry));
-	}
+	wim->hdr.boot_idx = boot_idx;
 	return 0;
 }
 
-WIMLIBAPI int wimlib_get_part_number(const WIMStruct *w, int *total_parts_ret)
+WIMLIBAPI int
+wimlib_get_part_number(const WIMStruct *w, int *total_parts_ret)
 {
 	if (total_parts_ret)
 		*total_parts_ret = w->hdr.total_parts;
 	return w->hdr.part_number;
 }
-				    
 
-WIMLIBAPI int wimlib_get_boot_idx(const WIMStruct *w)
+
+WIMLIBAPI int
+wimlib_get_boot_idx(const WIMStruct *w)
 {
 	return w->hdr.boot_idx;
 }
 
-/* 
+static int
+do_open_wim(const tchar *filename, int *fd_ret)
+{
+	int fd;
+
+	fd = topen(filename, O_RDONLY | O_BINARY);
+	if (fd == -1) {
+		ERROR_WITH_ERRNO("Can't open \"%"TS"\" read-only", filename);
+		return WIMLIB_ERR_OPEN;
+	}
+	*fd_ret = fd;
+	return 0;
+}
+
+int
+reopen_wim(WIMStruct *w)
+{
+	wimlib_assert(w->in_fd == -1);
+	return do_open_wim(w->filename, &w->in_fd);
+}
+
+int
+close_wim(WIMStruct *w)
+{
+	if (w->in_fd != -1) {
+		close(w->in_fd);
+		w->in_fd = -1;
+	}
+	return 0;
+}
+
+/*
  * Begins the reading of a WIM file; opens the file and reads its header and
  * lookup table, and optionally checks the integrity.
  */
-static int begin_read(WIMStruct *w, const char *in_wim_path, int flags)
+static int
+begin_read(WIMStruct *w, const tchar *in_wim_path, int open_flags,
+	   wimlib_progress_func_t progress_func)
 {
 	int ret;
-	uint xml_num_images;
+	int xml_num_images;
+
+	DEBUG("Reading the WIM file `%"TS"'", in_wim_path);
 
-	DEBUG("Reading the WIM file `%s'", in_wim_path);
+	ret = do_open_wim(in_wim_path, &w->in_fd);
+	if (ret)
+		return ret;
 
-	w->filename = STRDUP(in_wim_path);
+	/* The absolute path to the WIM is requested so that wimlib_overwrite()
+	 * still works even if the process changes its working directory.  This
+	 * actually happens if a WIM is mounted read-write, since the FUSE
+	 * thread changes directory to "/", and it needs to be able to find the
+	 * WIM file again.
+	 *
+	 * This will break if the full path to the WIM changes in the
+	 * intervening time...
+	 *
+	 * Warning: in Windows native builds, realpath() calls the replacement
+	 * function in win32.c.
+	 */
+	w->filename = realpath(in_wim_path, NULL);
 	if (!w->filename) {
-		ERROR("Failed to allocate memory for WIM filename");
-		return WIMLIB_ERR_NOMEM;
+		ERROR_WITH_ERRNO("Failed to resolve WIM filename");
+		if (errno == ENOMEM)
+			return WIMLIB_ERR_NOMEM;
+		else
+			return WIMLIB_ERR_OPEN;
 	}
 
-	w->fp = fopen(in_wim_path, "rb");
+	ret = read_header(w->filename, w->in_fd, &w->hdr);
+	if (ret)
+		return ret;
 
-	if (!w->fp) {
-		ERROR_WITH_ERRNO("Failed to open the file `%s' for reading",
-				 in_wim_path);
-		return WIMLIB_ERR_OPEN;
+	if (open_flags & WIMLIB_OPEN_FLAG_WRITE_ACCESS) {
+		ret = can_modify_wim(w);
+		if (ret)
+			return ret;
 	}
 
-	ret = read_header(w->fp, &w->hdr, flags & WIMLIB_OPEN_FLAG_SPLIT_OK);
-	if (ret != 0)
-		return ret;
+	if (w->hdr.total_parts != 1 && !(open_flags & WIMLIB_OPEN_FLAG_SPLIT_OK)) {
+		ERROR("\"%"TS"\": This WIM is part %u of a %u-part WIM",
+		      w->filename, w->hdr.part_number, w->hdr.total_parts);
+		return WIMLIB_ERR_SPLIT_UNSUPPORTED;
+	}
 
-	DEBUG("Wim file contains %u images", w->hdr.image_count);
+	DEBUG("According to header, WIM contains %u images", w->hdr.image_count);
 
 	/* If the boot index is invalid, print a warning and set it to 0 */
 	if (w->hdr.boot_idx > w->hdr.image_count) {
-		WARNING("In `%s', image %u is marked as bootable, "
-			"but there are only %u images",
-			 in_wim_path, w->hdr.boot_idx, w->hdr.image_count);
+		WARNING("In `%"TS"', image %u is marked as bootable, "
+			"but there are only %u images in the WIM",
+			in_wim_path, w->hdr.boot_idx, w->hdr.image_count);
 		w->hdr.boot_idx = 0;
 	}
 
-	if (wimlib_get_compression_type(w) == WIM_COMPRESSION_TYPE_INVALID) {
-		ERROR("Invalid compression type (WIM header flags = %x)",
+	if (wimlib_get_compression_type(w) == WIMLIB_COMPRESSION_TYPE_INVALID) {
+		ERROR("Invalid compression type (WIM header flags = 0x%x)",
 		      w->hdr.flags);
 		return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
 	}
 
-
-	if (flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY) {
-		int integrity_status;
-		ret = check_wim_integrity(w, 
-					  flags & WIMLIB_OPEN_FLAG_SHOW_PROGRESS, 
-					  &integrity_status);
-		if (ret != 0) {
-			ERROR("Error in check_wim_integrity()");
-			return ret;
-		}
-		if (integrity_status == WIM_INTEGRITY_NONEXISTENT) {
-			WARNING("No integrity information for `%s'; skipping "
-				"integrity check.", w->filename);
-		} else if (integrity_status == WIM_INTEGRITY_NOT_OK) {
+	if (open_flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY) {
+		ret = check_wim_integrity(w, progress_func);
+		if (ret == WIM_INTEGRITY_NONEXISTENT) {
+			WARNING("No integrity information for `%"TS"'; skipping "
+				"integrity check.", in_wim_path);
+		} else if (ret == WIM_INTEGRITY_NOT_OK) {
 			ERROR("WIM is not intact! (Failed integrity check)");
 			return WIMLIB_ERR_INTEGRITY;
+		} else if (ret != WIM_INTEGRITY_OK) {
+			return ret;
 		}
 	}
 
-	if (resource_is_compressed(&w->hdr.lookup_table_res_entry)) {
-		ERROR("Didn't expect a compressed lookup table!");
-		ERROR("Ask the author to implement support for this.");
-		return WIMLIB_ERR_COMPRESSED_LOOKUP_TABLE;
+	if (w->hdr.image_count != 0 && w->hdr.part_number == 1) {
+		w->image_metadata = new_image_metadata_array(w->hdr.image_count);
+		if (!w->image_metadata)
+			return WIMLIB_ERR_NOMEM;
 	}
 
-	ret = read_lookup_table(w->fp, w->hdr.lookup_table_res_entry.offset,
-				w->hdr.lookup_table_res_entry.size, 
-				&w->lookup_table);
-	if (ret != 0)
+	ret = read_lookup_table(w);
+	if (ret)
 		return ret;
 
-	w->image_metadata = CALLOC(w->hdr.image_count, 
-				   sizeof(struct image_metadata));
+	ret = read_xml_data(w->in_fd, &w->hdr.xml_res_entry, &w->wim_info);
+	if (ret)
+		return ret;
 
-	if (!w->image_metadata) {
-		ERROR("Failed to allocate memory for %u metadata structures",
-		      w->hdr.image_count);
-		return WIMLIB_ERR_NOMEM;
+	xml_num_images = wim_info_get_num_images(w->wim_info);
+	if (xml_num_images != w->hdr.image_count) {
+		ERROR("In the file `%"TS"', there are %u <IMAGE> elements "
+		      "in the XML data,", in_wim_path, xml_num_images);
+		ERROR("but %u images in the WIM!  There must be exactly one "
+		      "<IMAGE> element per image.", w->hdr.image_count);
+		return WIMLIB_ERR_IMAGE_COUNT;
 	}
-	w->current_image = 0;
 
-	DEBUG("Looking for metadata resources in the lookup table.");
+	DEBUG("Done beginning read of WIM file `%"TS"'.", in_wim_path);
+	return 0;
+}
 
-	/* Find the images in the WIM by searching the lookup table. */
-	ret = for_lookup_table_entry(w->lookup_table, 
-	  			     append_metadata_resource_entry, w);
+/*
+ * Opens a WIM file and creates a WIMStruct for it.
+ */
+WIMLIBAPI int
+wimlib_open_wim(const tchar *wim_file, int open_flags,
+		WIMStruct **wim_ret,
+		wimlib_progress_func_t progress_func)
+{
+	WIMStruct *wim;
+	int ret;
 
-	if (ret != 0)
-		return ret;
+	ret = WIMLIB_ERR_INVALID_PARAM;
+	if (!wim_file || !wim_ret)
+		goto out;
+
+	ret = WIMLIB_ERR_NOMEM;
+	wim = new_wim_struct();
+	if (!wim)
+		goto out;
+
+	ret = begin_read(wim, wim_file, open_flags, progress_func);
+	if (ret)
+		goto out_wimlib_free;
+
+	ret = 0;
+	*wim_ret = wim;
+	goto out;
+out_wimlib_free:
+	wimlib_free(wim);
+out:
+	return ret;
+}
 
-	/* Make sure all the expected images were found.  (We already have
-	 * returned false if *extra* images were found) */
-	if (w->current_image != w->hdr.image_count && w->hdr.part_number == 1) {
-		ERROR("Only found %u images in WIM, but expected %u",
-		      w->current_image, w->hdr.image_count);
-		return WIMLIB_ERR_IMAGE_COUNT;
+void
+destroy_image_metadata(struct wim_image_metadata *imd,
+		       struct wim_lookup_table *table,
+		       bool free_metadata_lte)
+{
+	free_dentry_tree(imd->root_dentry, table);
+	imd->root_dentry = NULL;
+	free_wim_security_data(imd->security_data);
+	imd->security_data = NULL;
+
+	if (free_metadata_lte) {
+		free_lookup_table_entry(imd->metadata_lte);
+		imd->metadata_lte = NULL;
+	}
+	if (!table) {
+		struct wim_lookup_table_entry *lte, *tmp;
+		list_for_each_entry_safe(lte, tmp, &imd->unhashed_streams, unhashed_list)
+			free_lookup_table_entry(lte);
 	}
+	INIT_LIST_HEAD(&imd->unhashed_streams);
+	INIT_LIST_HEAD(&imd->inode_list);
+#ifdef WITH_NTFS_3G
+	if (imd->ntfs_vol) {
+		do_ntfs_umount(imd->ntfs_vol);
+		imd->ntfs_vol = NULL;
+	}
+#endif
+}
 
+void
+put_image_metadata(struct wim_image_metadata *imd,
+		   struct wim_lookup_table *table)
+{
+	if (imd && --imd->refcnt == 0) {
+		destroy_image_metadata(imd, table, true);
+		FREE(imd);
+	}
+}
+
+/* Appends the specified image metadata structure to the array of image metadata
+ * for a WIM, and increments the image count. */
+int
+append_image_metadata(WIMStruct *w, struct wim_image_metadata *imd)
+{
+	struct wim_image_metadata **imd_array;
 
-	/* Sort images by the position of their metadata resources.  I'm
-	 * assuming that is what determines the other of the images in the WIM
-	 * file, rather than their order in the lookup table, which is random
-	 * because of hashing. */
-	qsort(w->image_metadata, w->current_image,
-	      sizeof(struct image_metadata), sort_image_metadata_by_position);
+	DEBUG("Reallocating image metadata array for image_count = %u",
+	      w->hdr.image_count + 1);
+	imd_array = REALLOC(w->image_metadata,
+			    sizeof(w->image_metadata[0]) * (w->hdr.image_count + 1));
 
-	w->current_image = WIM_NO_IMAGE;
+	if (!imd_array)
+		return WIMLIB_ERR_NOMEM;
+	w->image_metadata = imd_array;
+	imd_array[w->hdr.image_count++] = imd;
+	return 0;
+}
 
-	/* Read the XML data. */
-	ret = read_xml_data(w->fp, &w->hdr.xml_res_entry, 
-			    &w->xml_data, &w->wim_info);
 
-	if (ret != 0) {
-		ERROR("Missing or invalid XML data");
-		return ret;
+struct wim_image_metadata *
+new_image_metadata(void)
+{
+	struct wim_image_metadata *imd;
+
+	imd = CALLOC(1, sizeof(*imd));
+	if (imd) {
+		imd->refcnt = 1;
+		INIT_LIST_HEAD(&imd->inode_list);
+		INIT_LIST_HEAD(&imd->unhashed_streams);
+		DEBUG("Created new image metadata (refcnt=1)");
+	} else {
+		ERROR_WITH_ERRNO("Failed to allocate new image metadata structure");
 	}
+	return imd;
+}
 
-	xml_num_images = wim_info_get_num_images(w->wim_info);
-	if (xml_num_images != w->hdr.image_count) {
-		ERROR("In the file `%s', there are %u <IMAGE> elements "
-		      "in the XML data,", in_wim_path, xml_num_images);
-		ERROR("but %u images in the WIM!  There must be exactly one "
-		      "<IMAGE> element per image.", w->hdr.image_count);
-		return WIMLIB_ERR_IMAGE_COUNT;
+struct wim_image_metadata **
+new_image_metadata_array(unsigned num_images)
+{
+	struct wim_image_metadata **imd_array;
+
+	DEBUG("Creating new image metadata array for %u images",
+	      num_images);
+
+	imd_array = CALLOC(num_images, sizeof(imd_array[0]));
+
+	if (!imd_array) {
+		ERROR("Failed to allocate memory for %u image metadata structures",
+		      num_images);
+		return NULL;
 	}
+	for (unsigned i = 0; i < num_images; i++) {
+		imd_array[i] = new_image_metadata();
+		if (!imd_array[i]) {
+			for (unsigned j = 0; j < i; j++)
+				put_image_metadata(imd_array[j], NULL);
+			FREE(imd_array);
+			return NULL;
+		}
+	}
+	return imd_array;
+}
 
-	DEBUG("Done beginning read of WIM file `%s'.", in_wim_path);
+/* Checksum all streams that are unhashed (other than the metadata streams),
+ * merging them into the lookup table as needed.  This is a no-op unless the
+ * library has previously used to add or mount an image using the same
+ * WIMStruct. */
+int
+wim_checksum_unhashed_streams(WIMStruct *w)
+{
+	int ret;
+	for (int i = 0; i < w->hdr.image_count; i++) {
+		struct wim_lookup_table_entry *lte, *tmp;
+		struct wim_image_metadata *imd = w->image_metadata[i];
+		image_for_each_unhashed_stream_safe(lte, tmp, imd) {
+			ret = hash_unhashed_stream(lte, w->lookup_table, NULL);
+			if (ret)
+				return ret;
+		}
+	}
 	return 0;
 }
 
+/*
+ * can_modify_wim - Check if a given WIM is writeable.  This is only the case if
+ * it meets the following three conditions:
+ *
+ * 1. Write access is allowed to the underlying file (if any) at the filesystem level.
+ * 2. The WIM is not part of a spanned set.
+ * 3. The WIM_HDR_FLAG_READONLY flag is not set in the WIM header.
+ *
+ * Return value is 0 if writable; WIMLIB_ERR_WIM_IS_READONLY otherwise.
+ */
+int
+can_modify_wim(WIMStruct *wim)
+{
+	if (wim->filename) {
+		if (taccess(wim->filename, W_OK)) {
+			ERROR_WITH_ERRNO("Can't modify \"%"TS"\"", wim->filename);
+			return WIMLIB_ERR_WIM_IS_READONLY;
+		}
+	}
+	if (wim->hdr.total_parts != 1) {
+		ERROR("Cannot modify \"%"TS"\": is part of a spanned set",
+		      wim->filename);
+		return WIMLIB_ERR_WIM_IS_READONLY;
+	}
+	if (wim->hdr.flags & WIM_HDR_FLAG_READONLY) {
+		ERROR("Cannot modify \"%"TS"\": is marked read-only",
+		      wim->filename);
+		return WIMLIB_ERR_WIM_IS_READONLY;
+	}
+	return 0;
+}
 
 /*
- * Opens a WIM file and creates a WIMStruct for it.
+ * can_delete_from_wim - Check if files or images can be deleted from a given
+ * WIM file.
+ *
+ * This theoretically should be exactly the same as can_modify_wim(), but
+ * unfortunately, due to bugs in Microsoft's software that generate incorrect
+ * reference counts for some WIM resources, we need to run expensive
+ * verifications to make sure the reference counts are correct on all WIM
+ * resources.  Otherwise we might delete a WIM resource whose reference count
+ * has fallen to 0, but is actually still referenced somewhere.
  */
-WIMLIBAPI int wimlib_open_wim(const char *wim_file, int flags, 
-			      WIMStruct **w_ret)
+int
+can_delete_from_wim(WIMStruct *wim)
 {
-	WIMStruct *w;
 	int ret;
 
-	DEBUG("wim_file = `%s', flags = %#x", wim_file, flags);
-	w = new_wim_struct();
-	if (!w) {
-		ERROR("Failed to allocate memory for WIMStruct");
-		return WIMLIB_ERR_NOMEM;
-	}
-
-	ret = begin_read(w, wim_file, flags);
-	if (ret != 0) {
-		ERROR("Could not begin reading the WIM file `%s'", wim_file);
-		wimlib_free(w);
+	ret = can_modify_wim(wim);
+	if (ret)
 		return ret;
-	}
-	*w_ret = w;
+	if (!wim->refcnts_ok)
+		wim_recalculate_refcnts(wim);
 	return 0;
 }
 
 /* Frees the memory for the WIMStruct, including all internal memory; also
  * closes all files associated with the WIMStruct.  */
-WIMLIBAPI void wimlib_free(WIMStruct *w)
+WIMLIBAPI void
+wimlib_free(WIMStruct *w)
 {
-	uint i;
+	DEBUG("Freeing WIMStruct");
 
 	if (!w)
 		return;
-	if (w->fp)
-		fclose(w->fp);
-	if (w->out_fp)
-		fclose(w->out_fp);
+	if (w->in_fd != -1)
+		close(w->in_fd);
+	if (w->out_fd != -1)
+		close(w->out_fd);
 
 	free_lookup_table(w->lookup_table);
 
 	FREE(w->filename);
-	FREE(w->output_dir);
-	FREE(w->xml_data);
 	free_wim_info(w->wim_info);
 	if (w->image_metadata) {
-		for (i = 0; i < w->hdr.image_count; i++) {
-			free_dentry_tree(w->image_metadata[i].root_dentry, 
-					 NULL, false);
-			free_security_data(w->image_metadata[i].security_data);
-		}
+		for (unsigned i = 0; i < w->hdr.image_count; i++)
+			put_image_metadata(w->image_metadata[i], NULL);
 		FREE(w->image_metadata);
 	}
 	FREE(w);
+	DEBUG("Freed WIMStruct");
 }
 
+static bool
+test_locale_ctype_utf8(void)
+{
+#ifdef __WIN32__
+	return false;
+#else
+	char *ctype = nl_langinfo(CODESET);
+
+	return (!strstr(ctype, "UTF-8") ||
+		!strstr(ctype, "UTF8") ||
+		!strstr(ctype, "utf8") ||
+		!strstr(ctype, "utf-8"));
+#endif
+}
+
+WIMLIBAPI int
+wimlib_global_init(int init_flags)
+{
+	libxml_global_init();
+	if (!(init_flags & WIMLIB_INIT_FLAG_ASSUME_UTF8)) {
+		wimlib_mbs_is_utf8 = test_locale_ctype_utf8();
+	#ifdef WITH_NTFS_3G
+		if (!wimlib_mbs_is_utf8)
+			libntfs3g_global_init();
+	#endif
+	}
+#ifdef __WIN32__
+	win32_global_init();
+#endif
+	return 0;
+}
+
+/* Free global memory allocations.  Not strictly necessary if the process using
+ * wimlib is just about to exit (as is the case for 'imagex'). */
+WIMLIBAPI void
+wimlib_global_cleanup(void)
+{
+	libxml_global_cleanup();
+	iconv_global_cleanup();
+#ifdef __WIN32__
+	win32_global_cleanup();
+#endif
+}