}
/*
- * Reads the lookup table from a WIM file. Each entry specifies a stream that
- * the WIM file contains, along with its location and SHA1 message digest.
+ * Reads the lookup table from a WIM file. Usually, each entry specifies a
+ * stream that the WIM file contains, along with its location and SHA1 message
+ * digest.
*
- * Saves lookup table entries for non-metadata streams in a hash table, and
- * saves the metadata entry for each image in a special per-image location (the
- * image_metadata array).
+ * Saves lookup table entries for non-metadata streams in a hash table (set to
+ * wim->lookup_table), and saves the metadata entry for each image in a special
+ * per-image location (the wim->image_metadata array).
*
- * Return values:
+ * This works for both version WIM_VERSION_DEFAULT (68864) and version
+ * WIM_VERSION_PACKED_STREAMS (3584) WIMs.
+ *
+ * Possible return values:
* WIMLIB_ERR_SUCCESS (0)
* WIMLIB_ERR_INVALID_LOOKUP_TABLE_ENTRY
- * WIMLIB_ERR_RESOURCE_NOT_FOUND
+ * WIMLIB_ERR_NOMEM
*
- * Or an error code caused by failure to read the lookup table into memory.
+ * Or an error code caused by failure to read the lookup table from the WIM
+ * file.
*/
int
read_wim_lookup_table(WIMStruct *wim)
&((const struct wim_lookup_table_entry_disk*)buf)[i];
struct wim_reshdr reshdr;
u16 part_number;
- struct wim_lookup_table_entry *duplicate_entry;
/* Get the resource header */
get_wim_reshdr(&disk_entry->reshdr, &reshdr);
* Transfer the values to the `struct
* wim_resource_spec', and discard the current stream
* since this lookup table entry did not, in fact,
- * correspond to a "stream".
- */
+ * correspond to a "stream". */
- /* Uncompressed size of the resource pack is actually
- * stored in the header of the resource itself. Read
- * it, and also grab the chunk size and compression type
- * (which are not necessarily the defaults from the WIM
- * header). */
+ /* The uncompressed size of the packed resource is
+ * actually stored in the header of the resource itself.
+ * Read it, and also grab the chunk size and compression
+ * type (which are not necessarily the defaults from the
+ * WIM header). */
struct alt_chunk_table_header_disk hdr;
ret = full_pread(&wim->in_fd, &hdr,
goto free_cur_entry_and_continue;
}
- /* Ignore streams with zero hash. */
+ /* Ignore entries with all zeroes in the hash field. */
if (is_zero_hash(cur_entry->hash))
goto free_cur_entry_and_continue;
if (reshdr.flags & WIM_RESHDR_FLAG_METADATA) {
+
/* Lookup table entry for a metadata resource. */
- /* Metadata entries with no references must be ignored;
- * see, for example, the WinPE WIMs from the WAIK v2.1.
+ /* Metadata entries with no references must be ignored.
+ * See, for example, the WinPE WIMs from the WAIK v2.1.
*/
if (cur_entry->refcnt == 0)
goto free_cur_entry_and_continue;
if (cur_entry->refcnt != 1) {
+ /* We don't currently support this case due to
+ * the complications of multiple images sharing
+ * the same metadata resource or a metadata
+ * resource also being referenced by files.
+ */
ERROR("Found metadata resource with refcnt != 1");
ret = WIMLIB_ERR_INVALID_LOOKUP_TABLE_ENTRY;
goto out;
"non-first part of the split WIM");
goto free_cur_entry_and_continue;
}
+
+ /* The number of entries in the lookup table with
+ * WIM_RESHDR_FLAG_METADATA set should be the same as
+ * the image_count field in the WIM header. */
if (image_index == wim->hdr.image_count) {
WARNING("Found more metadata resources than images");
goto free_cur_entry_and_continue;
}
/* Notice very carefully: We are assigning the metadata
- * resources in the exact order mirrored by their lookup
- * table entries on disk, which is the behavior of
- * Microsoft's software. In particular, this overrides
- * the actual locations of the metadata resources
- * themselves in the WIM file as well as any information
- * written in the XML data. */
+ * resources to images in the same order in which their
+ * lookup table entries occur on disk. (This is also
+ * the behavior of Microsoft's software.) In
+ * particular, this overrides the actual locations of
+ * the metadata resources themselves in the WIM file as
+ * well as any information written in the XML data. */
DEBUG("Found metadata resource for image %"PRIu32" at "
"offset %"PRIu64".",
image_index + 1,
wim->image_metadata[image_index++]->metadata_lte = cur_entry;
} else {
- /* Lookup table entry for a stream that is not a metadata
- * resource. */
+ /* Lookup table entry for a non-metadata stream. */
/* Ignore this stream if it's a duplicate. */
- duplicate_entry = lookup_stream(table, cur_entry->hash);
- if (duplicate_entry) {
+ if (lookup_stream(table, cur_entry->hash)) {
num_duplicate_entries++;
goto free_cur_entry_and_continue;
}
- /* Insert the stream into the lookup table (keyed by its
- * SHA1 message digest). */
+ /* Insert the stream into the in-memory lookup table,
+ * keyed by its SHA1 message digest. */
lookup_table_insert(table, cur_entry);
}
cur_entry->offset_in_res = 0;
cur_entry->size = reshdr.uncompressed_size;
cur_entry->flags = reshdr.flags;
+ ret = validate_resource(cur_rspec);
cur_rspec = NULL;
+ if (ret)
+ goto out;
}
continue;
git://wimlib.net / wimlib / blobdiff