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#!/usr/bin/env python
'''
@author: David Shaw, david.shaw.aw@gmail.com
Inspired by EAS Inspector for Fiddler
https://easinspectorforfiddler.codeplex.com
----- Apache License, Version 2.0 -----
Filename: ASWBXMLByteQueue.py
Copyright 2014, David P. Shaw
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
'''
from Queue import Queue
import logging
class ASWBXMLByteQueue(Queue):
def __init__(self, wbxmlBytes):
self.bytesDequeued = 0
self.bytesEnqueued = 0
Queue.__init__(self)
for byte in wbxmlBytes:
self.put(ord(byte))
self.bytesEnqueued += 1
logging.debug("Array byte count: %d, enqueued: %d" % (self.qsize(), self.bytesEnqueued))
"""
Created to debug the dequeueing of bytes
"""
def dequeueAndLog(self):
singleByte = self.get()
self.bytesDequeued += 1
logging.debug("Dequeued byte 0x{0:X} ({1} total)".format(singleByte, self.bytesDequeued))
return singleByte
"""
Return true if the continuation bit is set in the byte
"""
def checkContinuationBit(self, byteval):
continuationBitmask = 0x80
return (continuationBitmask & byteval) != 0
def dequeueMultibyteInt(self):
iReturn = 0
singleByte = 0xFF
while True:
iReturn <<= 7
if (self.qsize() == 0):
break
else:
singleByte = self.dequeueAndLog()
iReturn += int(singleByte & 0x7F)
if not self.checkContinuationBit(singleByte):
return iReturn
def dequeueString(self, length=None):
if ( length != None):
currentByte = 0x00
strReturn = ""
for i in range(0, length):
# TODO: Improve this handling. We are technically UTF-8, meaning
# that characters could be more than one byte long. This will fail if we have
# characters outside of the US-ASCII range
if ( self.qsize() == 0 ):
break
currentByte = self.dequeueAndLog()
strReturn += chr(currentByte)
else:
currentByte = 0x00
strReturn = ""
while True:
currentByte = self.dequeueAndLog()
if (currentByte != 0x00):
strReturn += chr(currentByte)
else:
break
return strReturn
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