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eerimoq avatar eerimoq commented on July 22, 2024

Hi,

I found two bugs in the BER codec thanks to your report:

  1. The SEQUENCE OF decoder ignores the tag, which it shouldn't. This is easy to fix, and I already fixed it locally.

  2. AUTOMATIC, EXPLICIT and IMPLICIT tagging is not compliant with the ASN.1 specifications. Tagging of the CHOICE type is wrong for sure. I'll have to investigate this further.

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eerimoq avatar eerimoq commented on July 22, 2024

I fixed 1. in b7b9e28. 2. will take longer to fix. Unclear when it will be ready.

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eerimoq avatar eerimoq commented on July 22, 2024

Version 0.25.0 can successfully decode dump.txt using structure.txt and type VoiceManagerMsg. It's uploaded to PyPI, install with pip install -U asn1tools.

>>> import asn1tools
>>> f = asn1tools.compile_files('structure.txt')
>>> f.decode('VoiceManagerMsg', open('dump.txt', 'rb').read())
{'phone': {'time-st': {'nsec': 353258578, 'sec': 1517541551}, 'call-id': '[email protected]', 'phone-msg': {'m-call': {'group-id': 'intouch', 'call
ed-pn': {'presentation': 0, 'nai': 4, 'number': '79958290016'}, 'calling-pn': {'presentation': 0, 'nai': 4, 'number': '79832650742'}, 'called-contact': {'uri': {'host': '11.
11.1.4', 'user': '+79958290016'}, 'nickname': '+79958290016'}, 'calling-contact': {'uri': {'host': '10.51.34.6', 'user': '+79832650742'}, 'nickname': '+79832650742', 'parame
ters': [{'value': '8a11i8td-CC-1003-OFC-14', 'key': 'tag'}]}, 'location-pn': {'presentation': 0, 'nai': 4, 'number': '79135999991'}}}}}
>>>

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