1.9.21 breaks loading files with stripped Unity version

[erikchan002]

Code

import UnityPy
UnityPy.config.FALLBACK_UNITY_VERSION = "2020.3.32f1" 
env = UnityPy.load("res001_no001.zip")

Error

Error loading, reverting to EndianBinaryReader:
 'NoneType' object has no attribute 'groups'

Bug This is a regression caused by #157 and does not happen with UnityPy 1.9.20 https://github.com/K0lb3/UnityPy/blob/b7d9f7793bbc34ae6da23ae326e427e6cd48484c/UnityPy/files/BundleFile.py#L95

To Reproduce

• a copy of the file that causes the problem
  • res001_no001.zip
• following data:
  • Python version 3.10.8
  • UnityPy version 1.9.21

[K0lb3]

Thanks for reporting the issue.

The encryption handling for the CN version added version handling to the BundleFile, which conflicted with the missing version at that point. So, the handling for this case simply had to be ported from the SerializedFile.