简单文件压缩加密脚本 python

#coding:utf-8

# version 1.1
# 添加了一个参数，可以指定轮换的值，虽然暴力破解完全没难度……

import sys
import getopt
import zlib
import base64
from 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:')
        except getopt.GetoptError, err:
            print str(err)
            self.usage()
        
        global _move
        mode = "serialize"
        for opt, value in options:
            if opt == "-d":
                mode = 'deSerialize'
            if opt == "-m":
                try:
                    _move = int(value)
                    if _move < 0 or _move > 128:
                        print "Specify a value in range [0, 128]"
                        sys.exit(1)
                except 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
            except 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(self, 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,
    defaults 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()