'''Module for string conversion.
This module provides two functions that allow
strings to be encoded and decoded in base 255.'''
################################################################################
__version__ = '$Revision: 0 $'
__date__ = 'February 11, 2007'
__author__ = 'Stephen "Zero" Chappell <my.bios@gmail.com>'
__credits__ = '''\
S. Schaub, for introducing me to programming.
B. Brown, for teaching me some math courses.
E. Skogen, for listening to my ideas.'''
################################################################################
import sys as _sys
################################################################################
def encode(string, divide=1024):
'Encode a string to base 255.'
def encode(s):
i = 0
for c in s:
i *= 257
i += ord(c) + 1
s = ''
while i:
s = chr(i % 254 + 2) + s
i /= 254
return s
return '\1'.join(encode(string[index:index+divide]) for index in xrange(0, len(string), divide))
def decode(string):
'Decode a string from base 255.'
def decode(s):
i = 0
for c in s:
i *= 254
i += ord(c) - 2
s = ''
while i:
s = chr(i % 257 - 1) + s
i /= 257
return s
return ''.join(decode(string) for string in string.split('\1'))
################################################################################
if __name__ == '__main__':
_sys.stdout.write('Content-Type: text/plain\n\n')
_sys.stdout.write(file(_sys.argv[0]).read())
