file_util.py 文件源码

def get_digest_and_size_for_file(file_name):
        """
        Gets file digest and size
        :param file_name: a file name
        :return:
        """
        CHUNK_SIZE = 16 * 4 * 1024
        f = open(file_name, 'rb')
        m = SHA256.new()
        while True:
            chunk = f.read(CHUNK_SIZE)
            if chunk == b'':
                break
            m.update(chunk)

        statinfo = os.stat(file_name)
        file_size = statinfo.st_size
        digest = base64.standard_b64encode(m.digest()).decode(UTF8)
        logger = getLogger(__name__)
        logger.debug(u'getting digest and size: %s, %s, file=%s', digest,
                     file_size, file_name)
        return digest, file_size