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ZIP supports a password-based form of encryption. Even though known
plaintext attacks have been found against it, it is still useful
to be able to get data out of such a file.
Usage:
zd = _ZipDecrypter(mypwd)
plain_char = zd(cypher_char)
plain_text = map(zd, cypher_text)
c C s� d } d g d } xh t d � D]Z } | } xA t d � D]3 } | d @r^ | d ?d @| A} q9 | d ?d @} q9 W| | | <q W| S)z�Generate a CRC-32 table.
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ZipExtFilezZFile-like object for reading an archive member.
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zZipExtFile.__repr__c C s� | j ra | d k ra | j j d | j � d } | d k ra | j | j | � } | | _ | S| j s} t j j | | � Sd } x| d k s� t | � | k r�| j d � } | d k r� | S| j j
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| � | j t | � 7_ | d S| j d � } | d k ry| d | t | � � } | j t | � 7_ | | 7} q� W| S) zrRead and return a line from the stream.
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r rL r �newlineN�chunk)r� r� rl r� �io�BufferedIOBase�readliner7 �peek�PATTERN�search�groupr� rS )ru �limitr� �lineZ readahead�matchr� r� r r r r� � s8 !
zZipExtFile.readlinec C s� | t | j � | j k r~ | j | � } t | � | j k ri | | j | j d � | _ d | _ n | j t | � 8_ | j | j | j d � S)z6Returns buffered bytes without advancing the position.Nr i )r7 r� r� r/ )ru r� r� r r r r� % s zZipExtFile.peekc C s d S)NTr )ru r r r �readable2 s zZipExtFile.readablec C sm | d k s | d k rj | j | j d � } d | _ d | _ x# | j se | | j | j � 7} qC W| S| | j } | t | j � k r� | j | j | � } | | _ | S| t | j � } | j | j d � } d | _ d | _ x| | d k rh| j rh| j | � } | t | � k rK| | _ | | _ | | d | � 7} P| | 7} | t | � 8} q� W| S)z�Read and return up to n bytes.
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zZipExtFile.readc C sZ | j d k r d St | | j � | _ | j rV | j | j k rV t d | j � � d S)NzBad CRC-32 for file %r)r� r� r� r� r r� )ru �newdatar r r � _update_crcV s
zZipExtFile._update_crcc C sp | d k s | d k rw | j | j d � } d | _ d | _ x0 | j sr | j | j � } | rC | | 7} PqC W| S| | j } | t | j � k r� | j | j | � } | | _ | S| t | j � } | j | j d � } d | _ d | _ | d k rlxf | j sk| j | � } | t | � k rW| | _ | | _ | | d | � 7} P| r| | 7} PqW| S)z7Read up to n bytes with at most one read() system call.Nr rL )r� r� r� r r r7 )ru r� r rI r r r r �read1` s>
zZipExtFile.read1c C s� | j s | d k r d S| j t k rf | j j } | t | � k ru | | j | t | � � 7} n | j | � } | j t k r� | j d k | _ n� | j t k rt | | j
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s/ z | j r | j j � Wd t � j � Xd S)N)r� r� r� �super)ru )rz r r r� � s zZipExtFile.close� i @ry ry )r r r r r r
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d d d � Z d d � Z d d � Z d d � Z e d d � � Z e j d d � � Z d d d � Z d d d d! � Z d d d" d# � Z d d d d$ d% � Z e d& d' � � Z d( d) � Z d* d+ � Z d d d, d- � Z d d. d/ � Z d0 d1 � Z d2 d3 � Z d4 d5 � Z! d6 d7 � Z" d S)8r a� Class with methods to open, read, write, close, list zip files.
z = ZipFile(file, mode="r", compression=ZIP_STORED, allowZip64=True)
file: Either the path to the file, or a file-like object.
If it is a path, the file will be opened and closed by ZipFile.
mode: The mode can be either read 'r', write 'w', exclusive create 'x',
or append 'a'.
compression: ZIP_STORED (no compression), ZIP_DEFLATED (requires zlib),
ZIP_BZIP2 (requires bz2) or ZIP_LZMA (requires lzma).
allowZip64: if True ZipFile will create files with ZIP64 extensions when
needed, otherwise it will raise an exception when this would
be necessary.
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