Patch YowAxoltolLayer to fix padding problems

These changes should be reverted when yowsup updates.

yowsupwrapper.py

@@ -45,9 +45,38 @@ from functools import partial
 
 #from session import MsgIDs
 
+# Temporarily work around yowsup padding bugs with new protocol
+class UpdatedYowAxolotlLayer(YowAxolotlLayer):
+	def decodeInt7bit(self, string):
+		idx = 0
+		while ord(string[idx]) >= 128:
+			idx += 1
+		consumedBytes = idx + 1
+		value = 0
+		while idx >= 0:
+			value <<= 7
+			value += ord(string[idx]) % 128
+			idx -= 1
+		return value, consumedBytes
+
+	def unpadV2Plaintext(self, v2plaintext):
+		end = -ord(v2plaintext[-1]) # length of the left padding
+		length,consumed = self.decodeInt7bit(v2plaintext[1:])
+		return v2plaintext[1+consumed:end]
+
+# Temporary env until yowsup updates
+class UpdatedS40YowsupEnv(env.S40YowsupEnv):
+	_VERSION = "2.13.39"
+	_OS_NAME= "S40"
+	_OS_VERSION = "14.26"
+	_DEVICE_NAME = "302"
+	_MANUFACTURER = "Nokia"
+	_TOKEN_STRING  = "PdA2DJyKoUrwLw1Bg6EIhzh502dF9noR9uFCllGk{phone}"
+	_AXOLOTL = True
+
 class YowsupApp(object):
 	def __init__(self):
-		env.CURRENT_ENV = env.S40YowsupEnv()
+		env.CURRENT_ENV = UpdatedS40YowsupEnv()
 
 		layers = (YowsupAppLayer,
 				YowParallelLayer((YowAuthenticationProtocolLayer,
@@ -65,7 +94,7 @@ class YowsupApp(object):
 					YowProfilesProtocolLayer,
 					YowGroupsProtocolLayer,
 					YowPresenceProtocolLayer)),
-				YowAxolotlLayer,
+				UpdatedYowAxolotlLayer,
 				YowCoderLayer,
 				YowCryptLayer,
 				YowStanzaRegulator,