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kun-lu avatar kun-lu commented on September 3, 2024

I have a similar problem.
asn1tools.codecs.ber.DecodeTagError when using two "SEQUENCE OF" in "CHOICE"
My ASN.1 file:

A DEFINITIONS::=BEGIN
B::=CHOICE{
    c   SEQUENCE OF INTEGER,
    d   SEQUENCE OF IA5String
}
END

My python code:

import asn1tools
asn_file = asn1tools.compile_files('./test.asn',codec='ber')
encoded = asn_file.encode('B', ('c', [1]))
print(hex(int.from_bytes(encoded, byteorder='big')))
decoded = asn_file.decode('B', encoded)
print(decoded)

Output:

C:\Users\xxx\Desktop\code\esl_file\venv\Scripts\python.exe C:/Users/xxx/Desktop/code/esl_file/test.py
0x3003020101
Traceback (most recent call last):
  File "C:\Users\xxx\Desktop\code\esl_file\test.py", line 5, in <module>
    decoded = asn_file.decode('B', encoded)
  File "C:\Users\xxx\Desktop\code\esl_file\venv\lib\site-packages\asn1tools\compiler.py", line 163, in decode
    decoded = type_.decode(data)
  File "C:\Users\xxx\Desktop\code\esl_file\venv\lib\site-packages\asn1tools\codecs\ber.py", line 1475, in decode
    return self.decode_with_length(data)[0]
  File "C:\Users\xxx\Desktop\code\esl_file\venv\lib\site-packages\asn1tools\codecs\ber.py", line 1483, in decode_with_length
    decoded, offset = self._type.decode(bytearray(data), 0)
  File "C:\Usersxxx\Desktop\code\esl_file\venv\lib\site-packages\asn1tools\codecs\__init__.py", line 158, in new_method
    raise e
  File "C:\Users\xxx\Desktop\code\esl_file\venv\lib\site-packages\asn1tools\codecs\__init__.py", line 153, in new_method
    return method(self, *args, **kwargs)
  File "C:\Users\xxx\Desktop\code\esl_file\venv\lib\site-packages\asn1tools\codecs\ber.py", line 1122, in decode
    decoded, offset = member.decode(data, offset)
  File "C:\Users\xxx\Desktop\code\esl_file\venv\lib\site-packages\asn1tools\codecs\__init__.py", line 158, in new_method
    raise e
  File "C:\Users\xxx\Desktop\code\esl_file\venv\lib\site-packages\asn1tools\codecs\__init__.py", line 153, in new_method
    return method(self, *args, **kwargs)
  File "C:\Users\xxx\Desktop\code\esl_file\venv\lib\site-packages\asn1tools\codecs\ber.py", line 436, in decode
    return self._decode(data, tag_end_offset)
  File "C:\Users\xxx\Desktop\code\esl_file\venv\lib\site-packages\asn1tools\codecs\ber.py", line 749, in _decode
    check_decode_error(self.element_type, decoded_element, data, offset)
  File "C:\Users\xxx\Desktop\code\esl_file\venv\lib\site-packages\asn1tools\codecs\ber.py", line 110, in check_decode_error
    raise DecodeTagError(asn_type, data, offset, location=asn_type.name)
asn1tools.codecs.ber.DecodeTagError: B.d: Expected IA5String with tag '16', but got '02'. (At offset: 2)

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eerimoq avatar eerimoq commented on September 3, 2024

The OSS Nokalva playground gives a compile error: line 4 (A): A0100E: Duplicate tag in type B: element 'c' (line 3) and element 'd' (line 4).

asn1tools should probably give an compile error as well, but I guess there is a bug.

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