Try to load the data from the store.

def Initialize(self):
    """Try to load the data from the store."""
    super(AFF4MemoryStreamBase, self).Initialize()
    contents = b""

    if "r" in self.mode:
      contents = self.Get(self.Schema.CONTENT).AsBytes()
      try:
        if contents is not None:
          contents = zlib.decompress(contents)
      except zlib.error:
        pass

    self.fd = io.BytesIO(contents)
    self.size = len(contents)
    self.offset = 0