test_tarfile.py 文件源码

def test_detect_stream_bz2(self):
        # Originally, tarfile's stream detection looked for the string
        # "BZh91" at the start of the file. This is incorrect because
        # the '9' represents the blocksize (900kB). If the file was
        # compressed using another blocksize autodetection fails.
        if not bz2:
            return

        with open(tarname, "rb") as fobj:
            data = fobj.read()

        # Compress with blocksize 100kB, the file starts with "BZh11".
        with bz2.BZ2File(tmpname, "wb", compresslevel=1) as fobj:
            fobj.write(data)

        self._testfunc_file(tmpname, "r|*")