if (!wim)
return NULL;
+ wim->refcnt = 1;
filedes_invalidate(&wim->in_fd);
filedes_invalidate(&wim->out_fd);
wim->out_solid_compression_type = wim_default_solid_compression_type();
wim->out_solid_chunk_size = wim_default_solid_chunk_size(
wim->out_solid_compression_type);
- INIT_LIST_HEAD(&wim->subwims);
return wim;
}
return WIMLIB_ERR_METADATA_NOT_FOUND;
/* If a valid image is currently selected, its metadata can be freed if
- * it has not been modified. */
+ * it is not dirty and no other WIMStructs may have it selected. */
deselect_current_wim_image(wim);
wim->current_image = image;
imd = wim_get_current_image_metadata(wim);
- if (imd->root_dentry || imd->modified) {
+ if (imd->root_dentry || is_image_dirty(imd)) {
ret = 0;
} else {
ret = read_metadata_resource(imd);
if (wim->current_image == WIMLIB_NO_IMAGE)
return;
imd = wim_get_current_image_metadata(wim);
- if (!imd->modified) {
+ if (!is_image_dirty(imd) && imd->refcnt == 1) {
wimlib_assert(list_empty(&imd->unhashed_blobs));
destroy_image_metadata(imd, NULL, false);
}
return 0;
}
+/* Free a WIMStruct after no more resources reference it. */
+void
+finalize_wim_struct(WIMStruct *wim)
+{
+ if (filedes_valid(&wim->in_fd))
+ filedes_close(&wim->in_fd);
+ if (filedes_valid(&wim->out_fd))
+ filedes_close(&wim->out_fd);
+ wimlib_free_decompressor(wim->decompressor);
+ xml_free_info_struct(wim->xml_info);
+ FREE(wim->filename);
+ FREE(wim);
+}
+
/* API function documented in wimlib.h */
WIMLIBAPI void
wimlib_free(WIMStruct *wim)
if (!wim)
return;
- while (!list_empty(&wim->subwims)) {
- WIMStruct *subwim;
-
- subwim = list_entry(wim->subwims.next, WIMStruct, subwim_node);
- list_del(&subwim->subwim_node);
- wimlib_free(subwim);
- }
-
- if (filedes_valid(&wim->in_fd))
- filedes_close(&wim->in_fd);
- if (filedes_valid(&wim->out_fd))
- filedes_close(&wim->out_fd);
+ /* The blob table and image metadata are freed immediately, but other
+ * members of the WIMStruct such as the input file descriptor are
+ * retained until no more exported resources reference the WIMStruct. */
free_blob_table(wim->blob_table);
-
- wimlib_free_decompressor(wim->decompressor);
-
- FREE(wim->filename);
- xml_free_info_struct(wim->xml_info);
- if (wim->image_metadata) {
- for (unsigned i = 0; i < wim->hdr.image_count; i++)
+ wim->blob_table = NULL;
+ if (wim->image_metadata != NULL) {
+ for (int i = 0; i < wim->hdr.image_count; i++)
put_image_metadata(wim->image_metadata[i], NULL);
FREE(wim->image_metadata);
+ wim->image_metadata = NULL;
}
- FREE(wim);
+
+ wimlib_assert(wim->refcnt > 0);
+ if (--wim->refcnt == 0)
+ finalize_wim_struct(wim);
}
static bool