private void initOldTables() {
		oldTables = new ReferenceTable[reference.getFileCount()];
		for (int i = 0; i < oldTables.length; i++) {
			ByteBuffer data = reference.get(i);
			if (data != null) {
				oldTables[i] = new ReferenceTable(i, data, null);
			}
		}
	}