decoded function decode only first line of CDR

[Benjalill]

Hello Eriq and Arsalan,

Hope you doing well. I'm trying to decode CDR from telecom. When i decode the CDR file (Which contains a lot of CDR), only the first CDR is decoded
CDR.zip
Do you have a tips for me please?

I would really appreciate your help guys.
Thanks

[Finndersen]

Hi @Benjalill ,
The .decode() method of the compiled schema will only decode the first record from the start of the byte data provided.
In order to decode multiple records you need to determine the length of each record decoded and then provide the data for the next record.
Something like:

schema = asn1tools.compile_files("CDR/cfx.asn")

with open("CDR/cdr", 'rb') as f:
    file_data = f.read()

records = []
index = 0
file_len = len(file_data)
while index < file_len:
    decoded_record, record_length = schema.decode_with_length('IMSRecord', file_data[index:])
    index += record_length
    records.append(decoded_record)