minor optimisation, saving function call to len() per iteration

tamper/charunicodeescape.py

@@ -31,6 +31,7 @@ def tamper(payload, **kwargs):
         retVal = ""
         i = 0
         payloadLength = len(payload)
+        
         while i < payloadLength:
             if payload[i] == '%' and (i < payloadLength - 2) and payload[i + 1:i + 2] in string.hexdigits and payload[i + 2:i + 3] in string.hexdigits:
                 retVal += "\\u00%s" % payload[i + 1:i + 3]