Simple File compression encryption script Python

# Coding: UTF-8 # version 1.1 # A parameter is added to specify the rotation value. Although brute-force cracking is not difficult ...... Import sysimport getoptimport zlibimport base64from cstringio import stringio_move = 15_line_sep = "\ n" class tmain: def _ init _ (Self): Options, argS = 0 0 if Len (sys. argv) = 1: Self. usage () Try: Options, argS = getopt. getopt (sys. argv [1:], 'dm: ') Doesn't getopt. getopterror, err: Print STR (ERR) self. usage () Global _ move mode = "serialize" for opt, value in options: If opt = "-d": mode = 'destaliz E 'if opt = "-M": Try: _ move = int (value) If _ move <0 or _ move> 128: print "specify a value in range [0,128]" sys. exit (1) failed t valueerror: # Won't effect _ move pass for filename in ARGs: F = getattr (self, mode) S = f (self. readfile (filename) fout = file (filename + ". out. PY ", 'wb ') fout. write (s) fout. close () print print "#################################" Print s def movecode (self, strobj ): Result = "" For I in strobj: Pass def compress (self, strobj): Return zlib. compress (strobj, 9) def decompress (self, strobj): Return zlib. decompress (strobj) def serialize (self, strobj): '''serialize the string into encoded format ''' strobj = self. compress (strobj) strobj = base64.standard _ b64encode (strobj) max_char_per_line = 40 C = 0 result = "" For I in strobj: C ++ = 1 if C> = max_char_per_line: c = 1 result + = _ line_sep result + = hex (ord (I) # + _ move) [2:] Return result def deserialize (self, strobj): strobj = strobj. replace (_ line_sep, '') Result =" "strlen = Len (strobj) If strlen % 2! = 0: Raise exception ("bad value") for I in xrange (0, Len (strobj), 2): c = strobj [I: I + 2] Try: C = CHR (INT (C, 16) #-_ move) TMP = hex (ord (c) [2:] result + = C doesn t valueerror, err: Print C, INT (C, 16), INT (C, 16)-_ move # For I in result: # sys. stdout. write (I) # print result = base64.standard _ b64decode (result) # Return compress (result) return self. decompress (result) def readfile (SEL F, filename): Return open (filename ). read () def usage (self,): usage_str = ''' {this_program} [-D] [-M 10] filename if the-D option is given, program will try to decode file, otherwise, program will encode file and print the result. -M specifies the move steps for character, ults to 15, notice, remember this value! You will need it '''. format (this_program = sys. argv [0]) print usage_str sys. exit () def main (): m = tmain () If _ name _ = '_ main _': Main ()