U Ú²gL ã@sddlZGdd„deƒZdS)éNc@sFeZdZdZdZddd„Zdd„Zdd „Zd d „Zd d „Z dd„Z dS)ÚCommonChecksumaHashlib-alike helper for CRC32C operations. This class should not be used directly and requires an update implementation. Args: initial_value (Optional[bytes]): the initial chunk of data from which the CRC32C checksum is computed. Defaults to b''. ©ócCsd|_|dkr| |¡dS)Nrr)Ú_crcÚupdate)ÚselfÚ initial_valuerrú;/tmp/pip-unpacked-wheel-1p3hnion/google_crc32c/_checksum.pyÚ__init__szCommonChecksum.__init__cCs tƒ‚dS)z®Update the checksum with a new chunk of data. Args: chunk (Optional[bytes]): a chunk of data used to extend the CRC32C checksum. N)ÚNotImplemented)rÚdatarrr r"szCommonChecksum.updatecCst d|j¡S)z¹Big-endian order, per RFC 4960. See: https://cloud.google.com/storage/docs/json_api/v1/objects#crc32c Returns: bytes: An eight-byte digest string. z>L)ÚstructÚpackr©rrrr Údigest+szCommonChecksum.digestcCsd |j¡ d¡S)zªLike :meth:`digest` except returns as a bytestring of double length. Returns bytes: A sixteen byte digest string, contaiing only hex digits. z{:08x}Úascii)ÚformatrÚencoderrrr Ú hexdigest5szCommonChecksum.hexdigestcCs| ¡}|j|_|S)zvCreate another checksum with the same CRC32C value. Returns: Checksum: the new instance. )Ú __class__r)rÚclonerrr Úcopy=szCommonChecksum.copyccs&| |¡}|sq"| |¡|VqdS)a;Consume chunks from a stream, extending our CRC32 checksum. Args: stream (BinaryIO): the stream to consume. chunksize (int): the size of the read to perform Returns: Generator[bytes, None, None]: Iterable of the chunks read from the stream. N)Úreadr)rÚstreamÚ chunksizeÚchunkrrr ÚconsumeGs  zCommonChecksum.consumeN)r) Ú__name__Ú __module__Ú __qualname__Ú__doc__Ú __slots__r rrrrrrrrr rs    r)r Úobjectrrrrr Ús