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pySim.ts_102_221: Fix FileDescriptor encoding for BER-TLV case

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This fixes a long-standing bug in the FileDescriptor IE class which so
far only supported decoding, but not encoding of BER-TLV file
descriptors.

Change-Id: I598b0e1709ee004bcf01a53beb91f68470e1f3da
This commit is contained in:
Harald Welte
2024-07-27 18:33:15 +02:00
parent f3b3ba15b8
commit cf65d92039
1 changed files with 5 additions and 9 deletions
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14
pySim/ts_102_221.py
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@@ -94,24 +94,20 @@ class TotalFileSize(BER_TLV_IE, tag=0x81):
# ETSI TS 102 221 11.1.1.4.3
class FileDescriptor(BER_TLV_IE, tag=0x82):
_test_decode = [
# FIXME: this doesn't work as _encode test for some strange reason.
( '82027921', { "file_descriptor_byte": { "shareable": True, "structure": "ber_tlv" }, "record_len": None, "num_of_rec": None } ),
]
_test_de_encode = [
( '82027921', { "file_descriptor_byte": { "shareable": True, "structure": "ber_tlv" }, "record_len": None, "num_of_rec": None } ),
( '82027821', { "file_descriptor_byte": { "shareable": True, "file_type": "df", "structure": "no_info_given" }, "record_len": None, "num_of_rec": None }),
( '82024121', { "file_descriptor_byte": { "shareable": True, "file_type": "working_ef", "structure": "transparent" }, "record_len": None, "num_of_rec": None } ),
( '82054221006e05', { "file_descriptor_byte": { "shareable": True, "file_type": "working_ef", "structure": "linear_fixed" }, "record_len": 110, "num_of_rec": 5 } ),
]
class BerTlvAdapter(Adapter):
def _parse(self, obj, context, path):
data = obj.read()
if data == b'\x01\x01\x01\x00\x00\x01':
def _decode(self, obj, context, path):
if obj == 0x39:
return 'ber_tlv'
raise ValidationError
def _build(self, obj, context, path):
def _encode(self, obj, context, path):
if obj == 'ber_tlv':
return b'\x01\x01\x01\x00\x00\x01'
return 0x39
raise ValidationError
FDB = Select(BitStruct(Const(0, Bit), 'shareable'/Flag, 'structure'/BerTlvAdapter(Const(0x39, BitsInteger(6)))),