Decoding with output in json format

[dbressan2]

Hi

I am trying to get decoding results in JSON format. I have tried two ways, none of the two being completely satisfying. The issues are with the ordering of decoding results and decoding of BIT STRING. Decoding with to_asn1() method gives nice results, which I would like to translate into JSON

method 1: using json.dump with the dictionary returned by invoking dcch() with dcch = NR_RRC_Definitions.UL_DCCH_Message() Works mostly well, but instead of LocationSource-r13: 'E'H -- a-gnss | wlan | bt -- we get
"LocationSource-r13", [ 14, 4 ] Hence value, length of BIT STRING

method 2: dcch.to_json() Issue is that dictionary order is completely messed up with bits of message appearing out of order. However BIT STRING decoding is better "locationSource-r16": { "LocationSource-r13": { "length": 4, "value": "e0" } },

Full code:

class MyEncoder(json.JSONEncoder): def default(self, obj):

if isinstance(obj, np.ndarray):

    #     return obj.tolist()
    if isinstance(obj, bytes):
        return obj.hex()
    return json.JSONEncoder.default(self, obj)

message = """ 00 c2 00 04 63 df 24 2b b0 10 7e 48 57 41 15 b7 5c d5 34 2c 0e bd c2 a8 fd 73 64 f1 ba c5 e7 a1 75 8d 53 43 ea d9 22 89 d5 30 44 08 91 21 1d 01 d6 1a c0 07 80 6b 26 4c 19 30 70 c1 8b 46 cd 19 da 75 80 04 a1 83 f6 16 6b 1b 38 0d 20 00 9F 00 """.replace(" ", "").replace("\n", "")

dcch = NR5G_Dec_2021.NR_RRC_Definitions.UL_DCCH_Message loc_source = LPP_Dec_2021.LPP_PDU_Definitions.LocationSource_r13

_cont_locationTimestamp_r16 = CHOICE(name='DisplacementTimeStamp-r15', mode=MODE_TYPE, typeref=ASN1RefType(('LPP-PDU-Definitions', 'DisplacementTimeStamp-r15')))

_cont_locationCoordinate_r16 = CHOICE(name='LocationCoordinates', mode=MODE_TYPE, typeref=ASN1RefType(('LPP-PDU-Definitions', 'LocationCoordinates')))

_cont_locationSource_r16 = BIT_STR(name='LocationSource-r13', mode=MODE_TYPE, typeref=ASN1RefType(('LPP-PDU-Definitions', 'LocationSource-r13')))

loc_info = ['message', 'c1', 'measurementReport', 'criticalExtensions', 'measurementReport', 'measResults', 'locationInfo-r16', 'commonLocationInfo-r16'] dcch.get_at(loc_info + ['locationTimestamp-r16'])._const_cont = _cont_locationTimestamp_r16 dcch.get_at(loc_info + ['locationTimestamp-r16'])._const_cont_enc = None dcch.get_at(loc_info + ['locationCoordinate-r16'])._const_cont = _cont_locationCoordinate_r16 dcch.get_at(loc_info + ['locationCoordinate-r16'])._const_cont_enc = None dcch.get_at(loc_info + ['locationSource-r16'])._const_cont = _cont_locationSource_r16 dcch.get_at(loc_info + ['locationSource-r16'])._const_cont_enc = None from pycrate_asn1rt.init import init_modules extensions = [_cont_locationTimestamp_r16, _cont_locationCoordinate_r16, _cont_locationSource_r16] NR5G_Dec_2021.NR_RRC_Definitions.all.extend(extensions) init_modules(NR5G_Dec_2021.NR_RRC_Definitions)

dcch.from_uper(bytes.fromhex(message))

print (dcch.to_asn1())

solution 1

json_object = json.dumps(dcch(), cls=MyEncoder, indent = 4) print (json_object)

solution 2

print(dcch.to_json())

[p1-bmu]

I don't understand what you exactly want to do, but from what you are indicating, maybe you can call .convert_named_val() on the dcch object, before collecting its value, and then serializing the value to JSON ? https://github.com/P1sec/pycrate/blob/5f5f151358a03641ce65374d014851cc8271b164/pycrate_asn1rt/asnobj.py#L1225

[dbressan2]

Hi

Thanks, yes using convert_named_val method and then converting Python set to list prior to serializing to JSON addresses my problem

Thank you very much for your help

Best regards

Dominique

From: Benoit Michau @.> Sent: Wednesday, February 16, 2022 5:56 PM To: P1sec/pycrate @.> Cc: Dominique Bressanelli @.>; Author @.> Subject: Re: [P1sec/pycrate] Decoding with output in json format (Issue #180)

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I don't understand what you exactly want to do, but from what you are indicating, maybe you can call .convert_named_val() on the dcch object, before collecting its value, and then serializing the value to JSON ? https://github.com/P1sec/pycrate/blob/5f5f151358a03641ce65374d014851cc8271b164/pycrate_asn1rt/asnobj.py#L1225

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