def METHOD_NAME(args: rdf_read_low_level.ReadLowLevelRequest) -> int:
  """Calculates the amount of pre_padding to be added when reading data.
  Args:
    args: Original ReadLowLevelRequest sent to this ClientAction.
  Returns:
    The pre padding to be added to the offset (for alignment).
  """
  block_size = args.sector_block_size or _DEFAULT_SECTOR_BLOCK_SIZE
  return args.offset % block_size