BitString -无法在BitStream中加载我的值

Question

一个简单的问题。

我有一个<\class 'str'> (选中)，其中包含一个长度为124的十六进制内容，名为hexapacket。

我是这样做的：

import bitstring

data = BitStream(hexa=hexapacket)
# My processing on bits

但它会引发错误，比如找不到长度等。

ValueError: invalid literal for int() with base 10: '0edd0e000201a9017dc0c3898000000000'

和

ValueError: Don't understand length '0edd0e000201a9017dc0c3898000000000' of token.

和

KeyError: ('0edd0e000201a9017dc0c3898000000000', 0)

你能帮我使它工作吗？这是我想要解析数据的解决方案。

编辑:我尝试了一些调试，但输出很奇怪，十六进制强制转换和bin()强制转换在字符串的开头添加了0b和0x，并且我通过string =string2来处理它:但它仍然不能用于BitStream from bitstring。我精确地确定原始包来自pyshark，并将packet.data.data转换为string。

代码：

if hexapacket.find(':') != -1:
    hexapacket = ''.join(packet.split(":"))
if hexapacket.find('0x') != -1:
    hexapacket = hexapacket[2:]
msgid = int(bin(int(hexapacket[:4],16))[2:-2],2)
messagetype = dict_ids[msgid]
lenoflen = int(bin(int(hexapacket[:4],16))[-2:],2)
print("ID: %d\nMSG: %s\nLoL: %d\n" % (msgid,messagetype,lenoflen))
print("My hexapacket\n%s" % hexapacket)
raw = BitStream(hex=hexapacket)

输出：

ID: 950
MSG: GameMapMovementRequestMessage
LoL: 1

My hexapacket
0ed93c0003519a418c418b050c0405fafb5a21348190b66ecc166c09f832a7324069fcd9e19ea6be654b26b42563908947857a2b3cb25ce920837262a5fb69

错误：

Traceback (most recent call last):
  File "/usr/local/lib/python3.5/site-packages/bitstring.py", line 612, in tokenparser
    length = int(length)
ValueError: invalid literal for int() with base 10: '0pad:0pad:0pad:0pad:0pad:0pad:0pad:0'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "main.py", line 232, in <module>
    messages = PacketProcessing().splitProcess(packet)
  File "main.py", line 182, in splitProcess
    data1 = raw.read('pad:%d'%datalen*8)
  File "/usr/local/lib/python3.5/site-packages/bitstring.py", line 3880, in read
    _, token = tokenparser(fmt)
  File "/usr/local/lib/python3.5/site-packages/bitstring.py", line 622, in tokenparser
    raise ValueError("Don't understand length '{0}' of token.".format(length))
ValueError: Don't understand length '0pad:0pad:0pad:0pad:0pad:0pad:0pad:0' of token.

repr(十六进制)和type(六进制)的输出：

'0ed93a0002118b11a8050c04053e03bcd154bb84543c9b2a7992280bddf099b126acd1e75bf274842565e499d9e0221f86c02fa26d0a859ce426e63a74'

和

<class 'str'>

答:使用Python3.x的BitString模块，更容易转换和读取数据。

Answer 1

如果您指定hex=关键字参数，它应该可以工作：

>>> import bitstring
>>> bitstring.BitStream(hex='0edd0e000201a9017dc0c3898000000000')
BitStream('0x0edd0e000201a9017dc0c3898000000000')