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Prepare for decoding/encoding records differently based on record number

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In their infinite wisdom, the authors of the EIRENE FFFIS for GSM-R SIM
cards invented yet a new way of encoding data in SIM card files: The
first record of a file may be encoded differently than further records
of files.

Let's add the required infrastructure to pySim so that the encode and
decode methods for record-oriented files get passed in the current
record number.

Change-Id: I02d6942016dd0631b21d1fd301711c13cb27962b
Related: OS#5784
This commit is contained in:
Harald Welte
2023-01-24 15:42:26 +01:00
parent 8dbf714e96
commit f6b37af721
7 changed files with 46 additions and 42 deletions
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8
pySim/ts_102_221.py
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@@ -608,13 +608,13 @@ class EF_PL(TransRecEF):
super().__init__(fid, sfid=sfid, name=name,
desc=desc, rec_len=2, size=(2, None))
def _decode_record_bin(self, bin_data):
def _decode_record_bin(self, bin_data, **kwargs):
if bin_data == b'\xff\xff':
return None
else:
return bin_data.decode('ascii')
def _encode_record_bin(self, in_json):
def _encode_record_bin(self, in_json, **kwargs):
if in_json is None:
return b'\xff\xff'
else:
@@ -665,7 +665,7 @@ class EF_ARR(LinFixedEF):
raise ValueError
return by_mode
def _decode_record_bin(self, raw_bin_data):
def _decode_record_bin(self, raw_bin_data, **kwargs):
# we can only guess if we should decode for EF or DF here :(
arr_seq = DataObjectSequence('arr', sequence=[AM_DO_EF, SC_DO])
dec = arr_seq.decode_multi(raw_bin_data)
@@ -673,7 +673,7 @@ class EF_ARR(LinFixedEF):
# 'un-flattening' decoder, and hence would be unable to encode :(
return dec[0]
def _encode_record_bin(self, in_json):
def _encode_record_bin(self, in_json, **kwargs):
# we can only guess if we should decode for EF or DF here :(
arr_seq = DataObjectSequence('arr', sequence=[AM_DO_EF, SC_DO])
return arr_seq.encode_multi(in_json)