def __init__(self, name, raise_if=ErrorDefect, lazy=False):
super(CfbIO, self).__init__(name, mode='rb')
MaybeDefected.__init__(self, raise_if=raise_if)
self.size = fstat(self.fileno()).st_size
self.header = Header(self)
self.directory = Directory(self)
if not lazy:
self.directory.read()
