6 * Copyright (C) 2012, 2013 Eric Biggers
8 * This file is part of wimlib, a library for working with WIM files.
10 * wimlib is free software; you can redistribute it and/or modify it under the
11 * terms of the GNU General Public License as published by the Free
12 * Software Foundation; either version 3 of the License, or (at your option)
15 * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
16 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
17 * A PARTICULAR PURPOSE. See the GNU General Public License for more
20 * You should have received a copy of the GNU General Public License
21 * along with wimlib; if not, see http://www.gnu.org/licenses/.
29 #include "wimlib/dentry.h"
30 #include "wimlib/error.h"
31 #include "wimlib/inode.h"
32 #include "wimlib/lookup_table.h"
33 #include "wimlib/metadata.h"
34 #include "wimlib/xml.h"
38 inode_export_streams(struct wim_inode *inode,
39 const struct wim_lookup_table *src_lookup_table,
40 struct wim_lookup_table *dest_lookup_table)
44 struct wim_lookup_table_entry *src_lte, *dest_lte;
46 inode_unresolve_streams(inode);
47 for (i = 0; i <= inode->i_num_ads; i++) {
49 /* Retrieve SHA1 message digest of stream to export. */
50 hash = inode_stream_hash(inode, i);
51 if (is_zero_hash(hash)) /* Empty stream? */
54 /* Search for the stream (via SHA1 message digest) in the
56 dest_lte = lookup_stream(dest_lookup_table, hash);
58 /* Stream not yet present in destination WIM. Search
59 * for it in the source WIM, then export it into the
61 src_lte = lookup_stream(src_lookup_table, hash);
63 return stream_not_found_error(inode, hash);
65 dest_lte = clone_lookup_table_entry(src_lte);
67 return WIMLIB_ERR_NOMEM;
69 dest_lte->out_refcnt = 0;
70 lookup_table_insert(dest_lookup_table, dest_lte);
73 /* Stream is present in destination WIM (either pre-existing,
74 * already exported, or just exported above). Increment its
75 * reference count appropriately. Note: we use 'refcnt' for
76 * the raw reference count, but 'out_refcnt' for references
77 * arising just from the export operation; this is used to roll
78 * back a failed export if needed. */
79 dest_lte->refcnt += inode->i_nlink;
80 dest_lte->out_refcnt += inode->i_nlink;
86 lte_unexport(struct wim_lookup_table_entry *lte, void *_lookup_table)
88 struct wim_lookup_table *lookup_table = _lookup_table;
90 lte->refcnt -= lte->out_refcnt;
91 if (lte->refcnt == 0) {
92 lookup_table_unlink(lookup_table, lte);
93 free_lookup_table_entry(lte);
98 /* API function documented in wimlib.h */
100 wimlib_export_image(WIMStruct *src_wim,
103 const tchar *dest_name,
104 const tchar *dest_description,
106 wimlib_progress_func_t progress_func)
112 u32 orig_dest_boot_idx;
113 u32 orig_dest_image_count;
115 /* Check for sane parameters. */
116 if (src_wim == NULL || dest_wim == NULL)
117 return WIMLIB_ERR_INVALID_PARAM;
119 if (!wim_has_metadata(dest_wim))
120 return WIMLIB_ERR_METADATA_NOT_FOUND;
122 /* Destination WIM must be writable. */
123 ret = can_modify_wim(dest_wim);
127 if (src_image == WIMLIB_ALL_IMAGES) {
128 /* Multi-image export. */
129 if ((!(export_flags & WIMLIB_EXPORT_FLAG_NO_NAMES) &&
131 (!(export_flags & WIMLIB_EXPORT_FLAG_NO_DESCRIPTIONS) &&
134 ERROR("Image name or image description was "
135 "specified, but we are exporting "
137 return WIMLIB_ERR_INVALID_PARAM;
140 end_image = src_wim->hdr.image_count;
142 start_image = src_image;
143 end_image = src_image;
146 /* Stream checksums must be known before proceeding. */
147 ret = wim_checksum_unhashed_streams(src_wim);
150 ret = wim_checksum_unhashed_streams(dest_wim);
154 /* Zero 'out_refcnt' in all lookup table entries in the destination WIM;
155 * this tracks the number of references found from the source WIM
157 for_lookup_table_entry(dest_wim->lookup_table, lte_zero_out_refcnt,
160 /* Save the original count of images in the destination WIM and the boot
161 * index (used if rollback necessary). */
162 orig_dest_image_count = dest_wim->hdr.image_count;
163 orig_dest_boot_idx = dest_wim->hdr.boot_idx;
165 /* Export each requested image. */
166 for (image = start_image; image <= end_image; image++) {
167 const tchar *next_dest_name, *next_dest_description;
168 struct wim_image_metadata *src_imd;
169 struct wim_inode *inode;
171 DEBUG("Exporting image %d from \"%"TS"\"",
172 image, src_wim->filename);
174 /* Determine destination image name and description. */
176 if (export_flags & WIMLIB_EXPORT_FLAG_NO_NAMES) {
177 next_dest_name = NULL;
178 } else if (dest_name) {
179 next_dest_name = dest_name;
181 next_dest_name = wimlib_get_image_name(src_wim,
185 DEBUG("Using name \"%"TS"\"", next_dest_name);
187 if (export_flags & WIMLIB_EXPORT_FLAG_NO_DESCRIPTIONS) {
188 next_dest_description = NULL;
189 } if (dest_description) {
190 next_dest_description = dest_description;
192 next_dest_description = wimlib_get_image_description(
196 DEBUG("Using description \"%"TS"\"", next_dest_description);
198 /* Check for name conflict. */
199 if (wimlib_image_name_in_use(dest_wim, next_dest_name)) {
200 ERROR("There is already an image named \"%"TS"\" "
201 "in the destination WIM", next_dest_name);
202 ret = WIMLIB_ERR_IMAGE_NAME_COLLISION;
206 /* Load metadata for source image into memory. */
207 ret = select_wim_image(src_wim, image);
211 src_imd = wim_get_current_image_metadata(src_wim);
213 /* Iterate through inodes in the source image and export their
214 * streams into the destination WIM. */
215 image_for_each_inode(inode, src_imd) {
216 ret = inode_export_streams(inode,
217 src_wim->lookup_table,
218 dest_wim->lookup_table);
223 /* Export XML information into the destination WIM. */
224 ret = xml_export_image(src_wim->wim_info, image,
225 &dest_wim->wim_info, next_dest_name,
226 next_dest_description);
230 /* Reference the source image metadata from the destination WIM.
232 ret = append_image_metadata(dest_wim, src_imd);
237 /* Lock the metadata into memory. XXX: need better solution for
239 src_imd->modified = 1;
241 /* Set boot index in destination WIM. */
242 if ((export_flags & WIMLIB_EXPORT_FLAG_BOOT) &&
243 (src_image != WIMLIB_ALL_IMAGES ||
244 image == src_wim->hdr.boot_idx))
246 DEBUG("Marking destination image %u as bootable.",
247 dest_wim->hdr.image_count);
248 dest_wim->hdr.boot_idx = dest_wim->hdr.image_count;
252 /* Set the reparse point fixup flag on the destination WIM if the flag
253 * is set on the source WIM. */
254 if (src_wim->hdr.flags & WIM_HDR_FLAG_RP_FIX)
255 dest_wim->hdr.flags |= WIM_HDR_FLAG_RP_FIX;
256 DEBUG("Export operation successful.");
260 while ((image = wim_info_get_num_images(dest_wim->wim_info))
261 > orig_dest_image_count)
263 xml_delete_image(&dest_wim->wim_info, image);
265 while (dest_wim->hdr.image_count > orig_dest_image_count)
267 put_image_metadata(dest_wim->image_metadata[
268 --dest_wim->hdr.image_count], NULL);
270 for_lookup_table_entry(dest_wim->lookup_table, lte_unexport,
271 dest_wim->lookup_table);
272 dest_wim->hdr.boot_idx = orig_dest_boot_idx;