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 ?

pycrate/pycrate_asn1rt/asnobj.py

Line 1225 in 5f5f151

def convert_named_val(self):

[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) WARNING: This email originated from outside of Qualcomm. Please be wary of any links or attachments, and do not enable macros. 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 — Reply to this email directly, view it on GitHub<#180 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AHUUMPKA4IZ5LU4P4COPNB3U3PJJRANCNFSM5OOVPBGQ>. Triage notifications on the go with GitHub Mobile for iOS<https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android<https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you authored the thread.Message ID: ***@***.******@***.***>>