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Optimization of en-/decoder

This commit is contained in:
Sebastian Lohff 2011-11-17 23:21:17 +01:00
parent 5f5e9e8327
commit b9a96f6bc4
1 changed files with 49 additions and 32 deletions
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81
tunnel/spam/wtbase.py
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@ -5,7 +5,10 @@ Provides classes to encode text to arbitrary bases (base 2^n supported) and
then to textual forms. """
import math
import random
from random import randint, randrange
import sys
import time
from collections import deque
class DecodingException(Exception):
pass
@ -348,19 +351,22 @@ class SpamGenerator(TextGenerator):
def encode(self, data):
""" Encode data: Traverse wordlists. Return spam-text. """
listBits = self.convToBits(data)
listBitsLen = len(listBits)
nextList = self.startList
pos = 0
text = ""
# for performance!
getList = self.getList
while nextList:
bit = 8
if pos < len(listBits):
if pos < listBitsLen:
bit = listBits[pos]
#print "Pos:", pos, "- Entering list", nextList, "- Bit:", bit
l = self.getList(nextList)
idx = pos < len(listBits) and listBits[pos] or self.base
t = l[bit]
text += t.word
nextList = t.nextLists[random.randint(0, len(t.nextLists)-1)]
l = getList(nextList)
idx = pos < listBitsLen and listBits[pos] or self.base
tok = l[bit]
#text.append(tok.word)
text += tok.word
nextList = tok.nextLists[randrange(0, len(tok.nextLists))]
if bit != 8:
pos += 1
return text
@ -372,11 +378,12 @@ class SpamGenerator(TextGenerator):
""" Decode spam-text to original data. """
text = text.lstrip().replace("\r\n", "\n")
nextLists = [self.startList]
result = []
while len(text) > 0 and len(nextLists) > 0 and nextLists[0]:
result = deque()
findInList = self.findInList
while text != "" and len(nextLists) > 0 and nextLists[0]:
match = False
for listname in nextLists:
(match, bits, token) = self.findInList(text, listname)
(match, bits, token) = findInList(text, listname)
if match:
#print "matched value ", bits, "word", token.word
if bits != 8:
@ -403,8 +410,10 @@ class SpamGenerator(TextGenerator):
sList = self.getList(listname)
for key in sList:
#print "\tTesting word: ", sList[key].word
if sList[key].word and (text.startswith(sList[key].word) or \
text.replace("\n", "").startswith(sList[key].word.replace("\n", ""))):
w = sList[key].word
if w and (text.startswith(w)):
#or \
#text.replace("\n", "", 1).startswith(sList[key].word.replace("\n", "", 1))):
# HACK: Newline matching problem, mail classes add extra newlines
# ==> matching not possible
token = sList[key]
@ -415,26 +424,34 @@ class SpamGenerator(TextGenerator):
def main():
""" Main function, does en- and decoding test for testing purposes. """
data = "\xF2\x51\x92\x61\x9d\x1f\x0F\xb7\xaa\xc1"
for d in data:
print ord(d),
print ""
# data = "\xF2\x51\x92\x61\x9d\x1f\x0F\xb7\xaa\xc1"
#data = "".join(sys.argv[1:])
#for d in data:
# print ord(d),
#print ""
#t = SpamGenerator()
#d = t.convToBits(data)
#e = t.convToNums(d)
#print d
#for a in e:
# print ord(a),
#print ""
#msg = t.encode(data)
##print res, "\n"
#res = t.decode(msg)
#print
#print d
#for d in data:
# print ord(d),
#print ""
#print msg
t = SpamGenerator()
d = t.convToBits(data)
e = t.convToNums(d)
print d
for a in e:
print ord(a),
print ""
msg = t.encode(data)
#print res, "\n"
res = t.decode(msg)
print
print d
for d in data:
print ord(d),
print ""
print msg
#data = "".join([chr(randint(0, 255)) for i in range(1500)])
#t.encode(data)
#return
msg = open("file.txt", "r").read()
t.decode(msg)
print t.encode("Hallo ihr beiden")
if __name__ == '__main__':
main()