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_ZipDecryptera Class to handle decryption of files stored within a ZIP archive.
ZIP supports a password-based form of encryption. Even though known
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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)
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ZipExtFilezZFile-like object for reading an archive member.
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| � n | j t | � 7_ | d S| j d � } | d k r�| d | t | � � } n | j t | � 7_ | | 7} q� W| S) zrRead and return a line from the stream.
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zZipExtFile.readlinec C s� | t | j � | j k r� | j | � } t | � | j k ri | | j | j d � | _ d | _ q� | j t | � 8_ n | j | j | j d � S)z6Returns buffered bytes without advancing the position.Nr i )r7 r� r� r/ )ru �nr� r r r r� � s zZipExtFile.peekc C s d S)NTr )ru r r r �readable� s zZipExtFile.readablec C sp | 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 rk| j rk| j | � } | t | � k rN| | _ | | _ | | d | � 7} Pn | | 7} | t | � 8} q� W| S)z�Read and return up to n bytes.
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zZipExtFile.readc C sa | j d k r d St | | j � d @| _ | j r] | j | j k r] t d | j � � n d S)Nl �� zBad CRC-32 for file %r)r� r� r� r� r r� )ru �newdatar r r � _update_crc s
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zZipExtFile.read1c C s� | j s | d k r d S| j t k ri | j j } | t | � k rx | | j | t | � � 7} qx n | j | � } | j t k r� | j d k | _ n� | j t k r t | | j
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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 d. d/ � Z d0 d1 � Z d S)2r 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.
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mode: The mode can be either read "r", write "w" 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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r�| j j d d � d | _ Yq�Xn t d � � Wn3 | j } d | _ | j s*| j � n � Yn Xd S)z>Open the ZIP file with mode read "r", write "w" or append "a".r� �w�az(ZipFile() requires mode "r", "w", or "a"Fr �b� NrL r0 �wbzr+br r� Tr z Mode must be "r", "w" or "a")r� r� r )r� r� � _allowZip64�
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