def METHOD_NAME(self, buffer: bytes) -> bytes:
    """
    compress file.
    """
    tool = self.command
    if tool:
        tmp = tempfile.mkdtemp(dir=os.environ.get('tmp'))
        ToolInputFile = os.path.join(tmp, "pack_uncompress_sec_file")
        ToolOuputFile = os.path.join(tmp, "pack_sec_file")
        try:
            file = open(ToolInputFile, "wb")
            file.write(buffer)
            file.close()
            command = [tool, '-e', '-o', ToolOuputFile,
                              ToolInputFile]
            ExecuteCommand(command)
            buf = open(ToolOuputFile, "rb")
            res_buffer = buf.read()
        except Exception as msg:
            logger.error(msg)
            return ""
        else:
            buf.close()
            if os.path.exists(tmp):
                shutil.rmtree(tmp)
            return res_buffer
    else:
        logger.error(
            "Error parsing section: EFI_SECTION_GUID_DEFINED cannot be parsed at this time.")
        logger.info("Its GUID is: %s" % self.guid)
        return ""