Feel free to implement it. Sounds useful.

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Do you have any suggestions where I might start? I had a look through the code, but it wasn't clear to me where I should look to modify the code,
For now I have solved this by re-encoding the decoded contents to get the length.

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Start by designing the new decode method, and then make required changes throughout the package.

However, I would recommend framing the encoded UPER data by introducing a length field in the stream of data. It's obviously not required, but more robust in case of bugs in the encoder or decoder.

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Closing in lack of response.

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Initial progress was made at https://github.com/MBradbury/asn1tools but I ran into test errors such as:

$ python3 -m unittest tests.test_uper
..........................Failed to decode type with name B.
E...............

ERROR: test_real (tests.test_uper.Asn1ToolsUPerTest)

Traceback (most recent call last):
File "/home/duser/asn1tools/asn1tools/codecs/per.py", line 446, in read_length_determinant
}[value]
KeyError: 192

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/duser/asn1tools/tests/test_uper.py", line 147, in test_real
self.assert_encode_decode2(foo, type_name, decoded, encoded)
File "/home/duser/asn1tools/tests/utils.py", line 69, in assert_encode_decode2
decoded, decoded_bits = specification.decode2(type_name, encoded_message)
File "/home/duser/asn1tools/asn1tools/compiler.py", line 193, in decode2
decoded, decoded_bits = type_.decode2(data)
File "/home/duser/asn1tools/asn1tools/codecs/per.py", line 1991, in decode2
decoded = self._type.decode(decoder)
File "/home/duser/asn1tools/asn1tools/codecs/per.py", line 815, in decode
decoded = self.decode_root(decoder)
File "/home/duser/asn1tools/asn1tools/codecs/per.py", line 831, in decode_root
value = member.decode(decoder)
File "/home/duser/asn1tools/asn1tools/codecs/per.py", line 1098, in decode
length = decoder.read_length_determinant()
File "/home/duser/asn1tools/asn1tools/codecs/per.py", line 450, in read_length_determinant
value))
asn1tools.codecs.DecodeError: a: Bad length determinant fragmentation value 0xc0.

Ran 42 tests in 4.767s

FAILED (errors=1)

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Do you intend to continue the implementation? In that case we can reopen the issue.

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