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#!/usr/bin/python
# -*- coding: utf-8 -*-
import math
import re
keyStrBase64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
keyStrUriSafe = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-$"
baseReverseDic = {};
class Object(object):
def __init__(self, **kwargs):
for k, v in kwargs.items():
setattr(self, k, v)
def getBaseValue(alphabet, character):
if alphabet not in baseReverseDic:
baseReverseDic[alphabet] = {}
for i in range(len(alphabet)):
baseReverseDic[alphabet][alphabet[i]] = i
return baseReverseDic[alphabet][character]
def _compress(uncompressed, bitsPerChar, getCharFromInt):
if (uncompressed is None):
return ""
context_dictionary = {}
context_dictionaryToCreate= {}
context_c = ""
context_wc = ""
context_w = ""
context_enlargeIn = 2 # Compensate for the first entry which should not count
context_dictSize = 3
context_numBits = 2
context_data = []
context_data_val = 0
context_data_position = 0
for ii in range(len(uncompressed)):
context_c = uncompressed[ii]
if context_c not in context_dictionary:
context_dictionary[context_c] = context_dictSize
context_dictSize += 1
context_dictionaryToCreate[context_c] = True
context_wc = context_w + context_c
if context_wc in context_dictionary:
context_w = context_wc
else:
if context_w in context_dictionaryToCreate:
if ord(context_w[0]) < 256:
for i in range(context_numBits):
context_data_val = (context_data_val << 1)
if context_data_position == bitsPerChar-1:
context_data_position = 0
context_data.append(getCharFromInt(context_data_val))
context_data_val = 0
else:
context_data_position += 1
value = ord(context_w[0])
for i in range(8):
context_data_val = (context_data_val << 1) | (value & 1)
if context_data_position == bitsPerChar - 1:
context_data_position = 0
context_data.append(getCharFromInt(context_data_val))
context_data_val = 0
else:
context_data_position += 1
value = value >> 1
else:
value = 1
for i in range(context_numBits):
context_data_val = (context_data_val << 1) | value
if context_data_position == bitsPerChar - 1:
context_data_position = 0
context_data.append(getCharFromInt(context_data_val))
context_data_val = 0
else:
context_data_position += 1
value = 0
value = ord(context_w[0])
for i in range(16):
context_data_val = (context_data_val << 1) | (value & 1)
if context_data_position == bitsPerChar - 1:
context_data_position = 0
context_data.append(getCharFromInt(context_data_val))
context_data_val = 0
else:
context_data_position += 1
value = value >> 1
context_enlargeIn -= 1
if context_enlargeIn == 0:
context_enlargeIn = math.pow(2, context_numBits)
context_numBits += 1
del context_dictionaryToCreate[context_w]
else:
value = context_dictionary[context_w]
for i in range(context_numBits):
context_data_val = (context_data_val << 1) | (value & 1)
if context_data_position == bitsPerChar - 1:
context_data_position = 0
context_data.append(getCharFromInt(context_data_val))
context_data_val = 0
else:
context_data_position += 1
value = value >> 1
context_enlargeIn -= 1
if context_enlargeIn == 0:
context_enlargeIn = math.pow(2, context_numBits)
context_numBits += 1
# Add wc to the dictionary.
context_dictionary[context_wc] = context_dictSize
context_dictSize += 1
context_w = str(context_c)
# Output the code for w.
if context_w != "":
if context_w in context_dictionaryToCreate:
if ord(context_w[0]) < 256:
for i in range(context_numBits):
context_data_val = (context_data_val << 1)
if context_data_position == bitsPerChar-1:
context_data_position = 0
context_data.append(getCharFromInt(context_data_val))
context_data_val = 0
else:
context_data_position += 1
value = ord(context_w[0])
for i in range(8):
context_data_val = (context_data_val << 1) | (value & 1)
if context_data_position == bitsPerChar - 1:
context_data_position = 0
context_data.append(getCharFromInt(context_data_val))
context_data_val = 0
else:
context_data_position += 1
value = value >> 1
else:
value = 1
for i in range(context_numBits):
context_data_val = (context_data_val << 1) | value
if context_data_position == bitsPerChar - 1:
context_data_position = 0
context_data.append(getCharFromInt(context_data_val))
context_data_val = 0
else:
context_data_position += 1
value = 0
value = ord(context_w[0])
for i in range(16):
context_data_val = (context_data_val << 1) | (value & 1)
if context_data_position == bitsPerChar - 1:
context_data_position = 0
context_data.append(getCharFromInt(context_data_val))
context_data_val = 0
else:
context_data_position += 1
value = value >> 1
context_enlargeIn -= 1
if context_enlargeIn == 0:
context_enlargeIn = math.pow(2, context_numBits)
context_numBits += 1
del context_dictionaryToCreate[context_w]
else:
value = context_dictionary[context_w]
for i in range(context_numBits):
context_data_val = (context_data_val << 1) | (value & 1)
if context_data_position == bitsPerChar - 1:
context_data_position = 0
context_data.append(getCharFromInt(context_data_val))
context_data_val = 0
else:
context_data_position += 1
value = value >> 1
context_enlargeIn -= 1
if context_enlargeIn == 0:
context_enlargeIn = math.pow(2, context_numBits)
context_numBits += 1
# Mark the end of the stream
value = 2
for i in range(context_numBits):
context_data_val = (context_data_val << 1) | (value & 1)
if context_data_position == bitsPerChar - 1:
context_data_position = 0
context_data.append(getCharFromInt(context_data_val))
context_data_val = 0
else:
context_data_position += 1
value = value >> 1
# Flush the last char
while True:
context_data_val = (context_data_val << 1)
if context_data_position == bitsPerChar - 1:
context_data.append(getCharFromInt(context_data_val))
break
else:
context_data_position += 1
return "".join(context_data)
def _decompress(length, resetValue, getNextValue):
dictionary = {}
enlargeIn = 4
dictSize = 4
numBits = 3
entry = ""
result = []
data = Object(
val=getNextValue(0),
position=resetValue,
index=1
)
for i in range(3):
dictionary[i] = i
bits = 0
maxpower = math.pow(2, 2)
power = 1
while power != maxpower:
resb = data.val & data.position
data.position >>= 1
if data.position == 0:
data.position = resetValue
data.val = getNextValue(data.index)
data.index += 1
bits |= power if resb > 0 else 0
power <<= 1;
next = bits
if next == 0:
bits = 0
maxpower = math.pow(2, 8)
power = 1
while power != maxpower:
resb = data.val & data.position
data.position >>= 1
if data.position == 0:
data.position = resetValue
data.val = getNextValue(data.index)
data.index += 1
bits |= power if resb > 0 else 0
power <<= 1
c = chr(bits)
elif next == 1:
bits = 0
maxpower = math.pow(2, 16)
power = 1
while power != maxpower:
resb = data.val & data.position
data.position >>= 1
if data.position == 0:
data.position = resetValue;
data.val = getNextValue(data.index)
data.index += 1
bits |= power if resb > 0 else 0
power <<= 1
c = chr(bits)
elif next == 2:
return ""
dictionary[3] = c
w = c
result.append(c)
counter = 0
while True:
counter += 1
if data.index > length:
return ""
bits = 0
maxpower = math.pow(2, numBits)
power = 1
while power != maxpower:
resb = data.val & data.position
data.position >>= 1
if data.position == 0:
data.position = resetValue;
data.val = getNextValue(data.index)
data.index += 1
bits |= power if resb > 0 else 0
power <<= 1
c = bits
if c == 0:
bits = 0
maxpower = math.pow(2, 8)
power = 1
while power != maxpower:
resb = data.val & data.position
data.position >>= 1
if data.position == 0:
data.position = resetValue
data.val = getNextValue(data.index)
data.index += 1
bits |= power if resb > 0 else 0
power <<= 1
dictionary[dictSize] = chr(bits)
dictSize += 1
c = dictSize - 1
enlargeIn -= 1
elif c == 1:
bits = 0
maxpower = math.pow(2, 16)
power = 1
while power != maxpower:
resb = data.val & data.position
data.position >>= 1
if data.position == 0:
data.position = resetValue;
data.val = getNextValue(data.index)
data.index += 1
bits |= power if resb > 0 else 0
power <<= 1
dictionary[dictSize] = chr(bits)
dictSize += 1
c = dictSize - 1
enlargeIn -= 1
elif c == 2:
return "".join(result)
if enlargeIn == 0:
enlargeIn = math.pow(2, numBits)
numBits += 1
if c in dictionary:
entry = dictionary[c]
else:
if c == dictSize:
entry = w + w[0]
else:
return None
result.append(entry)
# Add w+entry[0] to the dictionary.
dictionary[dictSize] = w + entry[0]
dictSize += 1
enlargeIn -= 1
w = entry
if enlargeIn == 0:
enlargeIn = math.pow(2, numBits)
numBits += 1
class LZString(object):
@staticmethod
def compress(uncompressed):
return _compress(uncompressed, 16, chr)
@staticmethod
def compressToUTF16(uncompressed):
if uncompressed is None:
return ""
return _compress(uncompressed, 15, lambda a: chr(a+32)) + " "
@staticmethod
def compressToBase64(uncompressed):
if uncompressed is None:
return ""
res = _compress(uncompressed, 6, lambda a: keyStrBase64[a])
# To produce valid Base64
end = len(res) % 4
if end > 0:
res += "="*(4 - end)
return res
@staticmethod
def compressToEncodedURIComponent(uncompressed):
if uncompressed is None:
return ""
return _compress(uncompressed, 6, lambda a: keyStrUriSafe[a])
@staticmethod
def decompress(compressed):
if compressed is None:
return ""
if compressed == "":
return None
return _decompress(len(compressed), 32768, lambda index: ord(compressed[index]))
@staticmethod
def decompressFromUTF16(compressed):
if compressed is None:
return ""
if compressed == "":
return None
return _decompress(len(compressed), 16384, lambda index: compressed[index] - 32)
@staticmethod
def decompressFromBase64(compressed):
if compressed is None:
return ""
if compressed == "":
return None
return _decompress(len(compressed), 32, lambda index: getBaseValue(keyStrBase64, compressed[index]))
@staticmethod
def decompressFromEncodedURIComponent(compressed):
if compressed is None:
return ""
if compressed == "":
return None
compressed = compressed.replace(" ", "+")
return _decompress(len(compressed), 32, lambda index: getBaseValue(keyStrUriSafe, compressed[index]))
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