-
-struct lte_overwrite_prepare_args {
- WIMStruct *wim;
- off_t end_offset;
- struct list_head stream_list;
- struct stream_size_table stream_size_tab;
-};
-
-/* First phase of preparing streams for an in-place overwrite. This is called
- * on all streams, both hashed and unhashed, except the metadata resources. */
-static int
-lte_overwrite_prepare(struct wim_lookup_table_entry *lte, void *_args)
-{
- struct lte_overwrite_prepare_args *args = _args;
-
- wimlib_assert(!(lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA));
- if (lte->resource_location != RESOURCE_IN_WIM || lte->wim != args->wim)
- list_add_tail(<e->write_streams_list, &args->stream_list);
- lte->out_refcnt = lte->refcnt;
- stream_size_table_insert(lte, &args->stream_size_tab);
- return 0;
-}
-
-/* Second phase of preparing streams for an in-place overwrite. This is called
- * on existing metadata resources and hashed streams, but not unhashed streams.
- *
- * NOTE: lte->output_resource_entry is in union with lte->hash_list_2, so
- * lte_overwrite_prepare_2() must be called after lte_overwrite_prepare(), as
- * the latter uses lte->hash_list_2, while the former expects to set
- * lte->output_resource_entry. */
-static int
-lte_overwrite_prepare_2(struct wim_lookup_table_entry *lte, void *_args)
-{
- struct lte_overwrite_prepare_args *args = _args;
-
- if (lte->resource_location == RESOURCE_IN_WIM && lte->wim == args->wim) {
- /* We can't do an in place overwrite on the WIM if there are
- * streams after the XML data. */
- if (lte->resource_entry.offset +
- lte->resource_entry.size > args->end_offset)
- {
- if (wimlib_print_errors) {
- ERROR("The following resource is after the XML data:");
- print_lookup_table_entry(lte, stderr);
- }
- return WIMLIB_ERR_RESOURCE_ORDER;
- }
- copy_resource_entry(<e->output_resource_entry,
- <e->resource_entry);
- }
- return 0;
-}
-
-/* Given a WIM that we are going to overwrite in place with zero or more
- * additional streams added, construct a list the list of new unique streams
- * ('struct wim_lookup_table_entry's) that must be written, plus any unhashed
- * streams that need to be added but may be identical to other hashed or
- * unhashed streams. These unhashed streams are checksummed while the streams
- * are being written. To aid this process, the member @unique_size is set to 1
- * on streams that have a unique size and therefore must be written.
- *
- * The out_refcnt member of each 'struct wim_lookup_table_entry' is set to
- * indicate the number of times the stream is referenced in only the streams
- * that are being written; this may still be adjusted later when unhashed
- * streams are being resolved.
- */
-static int
-prepare_streams_for_overwrite(WIMStruct *wim, off_t end_offset,
- struct list_head *stream_list)
-{
- int ret;
- struct lte_overwrite_prepare_args args;
- unsigned i;
-
- args.wim = wim;
- args.end_offset = end_offset;
- ret = init_stream_size_table(&args.stream_size_tab,
- wim->lookup_table->capacity);
- if (ret)
- return ret;
-
- INIT_LIST_HEAD(&args.stream_list);
- for (i = 0; i < wim->hdr.image_count; i++) {
- struct wim_image_metadata *imd;
- struct wim_lookup_table_entry *lte;
-
- imd = wim->image_metadata[i];
- image_for_each_unhashed_stream(lte, imd)
- lte_overwrite_prepare(lte, &args);
- }
- for_lookup_table_entry(wim->lookup_table, lte_overwrite_prepare, &args);
- list_transfer(&args.stream_list, stream_list);
-
- for (i = 0; i < wim->hdr.image_count; i++) {
- ret = lte_overwrite_prepare_2(wim->image_metadata[i]->metadata_lte,
- &args);
- if (ret)
- goto out_destroy_stream_size_table;
- }
- ret = for_lookup_table_entry(wim->lookup_table,
- lte_overwrite_prepare_2, &args);
-out_destroy_stream_size_table:
- destroy_stream_size_table(&args.stream_size_tab);
- return ret;
-}
-
-
git://wimlib.net / wimlib / commitdiff