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import types, string, re
"""
Unserialize class for the PHP serialization format.
@version v0.4 BETA
@author Scott Hurring; scott at hurring dot com
@copyright Copyright (c) 2005 Scott Hurring
@license http://opensource.org/licenses/gpl-license.php GNU Public License
$Id: PHPUnserialize.py,v 1.1 2006/01/08 21:53:19 shurring Exp $
Most recent version can be found at:
http://hurring.com/code/python/phpserialize/
Usage:
# Create an instance of the unserialize engine
u = PHPUnserialize()
# unserialize some string into python data
data = u.unserialize(serialized_string)
Please see README.txt for more information.
"""
class PHPUnserialize(object):
"""
Class to unserialize something from the PHP Serialize format.
Usage:
u = PHPUnserialize()
data = u.unserialize(serialized_string)
"""
def __init__(self):
pass
def session_decode(self, data):
"""Thanks to Ken Restivo for suggesting the addition
of session_encode
"""
session = {}
while len(data) > 0:
m = re.match('^(\w+)\|', data)
if m:
key = m.group(1)
offset = len(key)+1
(dtype, dataoffset, value) = self._unserialize(data, offset)
offset = offset + dataoffset
data = data[offset:]
session[key] = value
else:
# No more stuff to decode
return session
return session
def unserialize(self, data):
return self._unserialize(data, 0)[2]
def _unserialize(self, data, offset=0):
"""
Find the next token and unserialize it.
Recurse on array.
offset = raw offset from start of data
return (type, offset, value)
"""
buf = []
dtype = string.lower(data[offset:offset+1])
#print "# dtype =", dtype
# 't:' = 2 chars
dataoffset = offset + 2
typeconvert = lambda x : x
chars = datalength = 0
# int => Integer
if dtype == 'i':
typeconvert = lambda x : int(x)
(chars, readdata) = self.read_until(data, dataoffset, ';')
# +1 for end semicolon
dataoffset += chars + 1
# bool => Boolean
elif dtype == 'b':
typeconvert = lambda x : (int(x) == 1)
(chars, readdata) = self.read_until(data, dataoffset, ';')
# +1 for end semicolon
dataoffset += chars + 1
# double => Floating Point
elif dtype == 'd':
typeconvert = lambda x : float(x)
(chars, readdata) = self.read_until(data, dataoffset, ';')
# +1 for end semicolon
dataoffset += chars + 1
# n => None
elif dtype == 'n':
readdata = None
# s => String
elif dtype == 's':
(chars, stringlength) = self.read_until(data, dataoffset, ':')
# +2 for colons around length field
dataoffset += chars + 2
# +1 for start quote
(chars, readdata) = self.read_chars(data, dataoffset+1, int(stringlength))
# +2 for endquote semicolon
dataoffset += chars + 2
if chars != int(stringlength) != int(readdata):
raise Exception("String length mismatch")
# array => Dict
# If you originally serialized a Tuple or List, it will
# be unserialized as a Dict. PHP doesn't have tuples or lists,
# only arrays - so everything has to get converted into an array
# when serializing and the original type of the array is lost
elif dtype == 'a':
readdata = {}
# How many keys does this list have?
(chars, keys) = self.read_until(data, dataoffset, ':')
# +2 for colons around length field
dataoffset += chars + 2
# Loop through and fetch this number of key/value pairs
for i in range(0, int(keys)):
# Read the key
(ktype, kchars, key) = self._unserialize(data, dataoffset)
dataoffset += kchars
#print "Key(%i) = (%s, %i, %s) %i" % (i, ktype, kchars, key, dataoffset)
# Read value of the key
(vtype, vchars, value) = self._unserialize(data, dataoffset)
dataoffset += vchars
#print "Value(%i) = (%s, %i, %s) %i" % (i, vtype, vchars, value, dataoffset)
# Set the list element
readdata[key] = value
# +1 for end semicolon
dataoffset += 1
#chars = int(dataoffset) - start
# I don't know how to unserialize this
else:
raise Exception("Unknown / Unhandled data type (%s)!" % dtype)
return (dtype, dataoffset-offset, typeconvert(readdata))
def read_until(self, data, offset, stopchar):
"""
Read from data[offset] until you encounter some char 'stopchar'.
"""
buf = []
char = data[offset:offset+1]
i = 2
while char != stopchar:
# Consumed all the characters and havent found ';'
if i+offset > len(data):
raise Exception("Invalid")
buf.append(char)
char = data[offset+(i-1):offset+i]
i += 1
# (chars_read, data)
return (len(buf), "".join(buf))
def read_chars(self, data, offset, length):
"""
Read 'length' number of chars from data[offset].
"""
buf = []
# Account for the starting quote char
#offset += 1
for i in range(0, length):
char = data[offset+(i-1):offset+i]
buf.append(char)
# (chars_read, data)
return (len(buf), "".join(buf))
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