String listing = new String(BlobStoreInputStream.readFully(store, listingId), "UTF-8");
JsopTokenizer t = new JsopTokenizer(listing);
File targetDir = new File(target);
targetDir.mkdirs();
t.read('{');
if (!t.matches('}')) {
do {
String file = t.readString();
t.read(':');
String id = t.readString();
byte[] data = BlobStoreInputStream.readFully(store, id);