
bc           @   s   d  Z  d d l Z d d l Z d d l Z y d d l Z e j Z Wn e k
 rb d Z e	 Z n Xd   Z
 e d k r x- e j d D] Z e
 e  p d Ge GHq Wn  d S(   s0   Guess which db package to use to open a db file.iNc         C   s  yq t  |  t j d d  } | j   t j d k oB t j d k sl t  |  t j d d  } | j   n  d SWn| t k
 r yQ t  |  t j d d  } | j   t d k	 r t j  |   } | j   d SWq t t
 f k
 r q Xn Xy t j |  t j d  t j |  t j d  j } | d	 k r8d
 St  |  t j d d  } z | j d  d k rnd
 SWd | j   XWn t t f k
 rn Xy t  |  d  } Wn t k
 rd SX| j d  } | j   | d	 d !} t |  d k rd Sy t j d |  \ } Wn t j k
 r,d SX| d k r=d S| d k rMd Sy t j d | d  \ } Wn t j k
 rd SX| d k rd Sd S(    sg  Guess which db package to use to open a db file.

    Return values:

    - None if the database file can't be read;
    - empty string if the file can be read but can't be recognized
    - the module name (e.g. "dbm" or "gdbm") if recognized.

    Importing the given module may still fail, and opening the
    database using that module may still fail.
    t   pagt   rbs   GNU gdbmt   os2emxt   dirt   dbmt   dbt   dati    t   dumbdbmi   t   't   "Ni   i   t    s   =liΚWi͚WiϚWt   gdbmia i at   bsddb185it   dbhash(   R   R	   (   iΚWi͚WiϚW(   ia i a(   ia i a(   t   opent   ost   extsept   closeR   t   libraryt   syst   platformt   IOErrort   Nonet	   _dbmerrort   statt   st_sizet   readt   OSErrort   lent   structt   unpackt   error(   t   filenamet   ft   dt   sizet   s16t   st   magic(    (    s   /usr/lib/python2.7/whichdb.pyt   whichdb   sj    



t   __main__i   t   UNKNOWN(   t   __doc__R   R   R   R   R   R   t   ImportErrorR   R   R'   t   __name__t   argvR    (    (    (    s   /usr/lib/python2.7/whichdb.pyt   <module>   s   
	b