برسی کد python

[Parviz-Turk]

دوستانی که زبان python بلدن کمک میکنن من این اسکریپت رو به کد VB تبدیل کنم؟ یا حداقل الگوریتمشو بسازم.


منبع : http://filippo.io/decompressing-lempel-ziv-stac-in-python (http://filippo.io/decompressing-lempel-ziv-stac-in-python/)



import collections

class BitReader:
"""
Gets a string or a iterable of chars (also mmap)
representing bytes (ord) and permits to extract

bits one by one like a stream
"""
def __init__(self, bytes):
self._bits = collections.deque()

for byte in bytes:
byte = ord(byte)
for n in xrange(8):
self._bits.append(bool((byte >> (7-n)) & 1))

def getBit(self):
return self._bits.popleft()

def getBits(self, num):
res = 0
for i in xrange(num):
res += self.getBit() << num-1-i
return res

def getByte(self):
return self.getBits(8)

def __len__(self):
return len(self._bits)

class RingList:
"""

When the list is full, for every item appended
the older is removed
"""
def __init__(self, length):
self.__data__ = collections.deque()
self.__full__ = False
self.__max__ = length

def append(self, x):
if self.__full__:
self.__data__.popleft()
self.__data__.append(x)
if self.size() == self.__max__:
self.__full__ = True

def get(self):
return self.__data__

def size(self):
return len(self.__data__)

def maxsize(self):
return self.__max__

def __getitem__(self, n):
if n >= self.size():
return None
return self.__data__[n]

def LZSDecompress(data, window = RingList(2048)):
"""
Gets a string or a iterable of chars (also mmap)
representing bytes (ord) and an optional
pre-populated dictionary; return the decompressed
string and the final dictionary
"""
reader = BitReader(data)
result = ''

while True:
bit = reader.getBit()
if not bit:
char = reader.getByte()
result += chr(char)
window.append(char)
else:
bit = reader.getBit()
if bit:
offset = reader.getBits(7)
if offset == 0:
# EOF
break
else:
offset = reader.getBits(11)

lenField = reader.getBits(2)
if lenField < 3:
lenght = lenField + 2
else:
lenField <<= 2
lenField += reader.getBits(2)
if lenField < 15:
lenght = (lenField & 0x0f) + 5
else:
lenCounter = 0
lenField = reader.getBits(4)
while lenField == 15:
lenField = reader.getBits(4)
lenCounter += 1
lenght = 15*lenCounter + 8 + lenField

for i in xrange(lenght):
char = window[-offset]
result += chr(char)
window.append(char)

return result, window