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bertlv_parse_one: Also return remainder after end of TLV

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Change-Id: I10ebd87f72ee934561118b768108e5dc76277660
This commit is contained in:
Harald Welte
2021-05-21 21:47:55 +02:00
parent de02718631
commit c1475307c8
3 changed files with 6 additions and 4 deletions
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2
pySim-shell.py
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@@ -265,7 +265,7 @@ class PySimCommands(CommandSet):
tags = self._cmd.rs.retrieve_tags()
for t in tags:
result = self._cmd.rs.retrieve_data(t)
(tag, l, val) = bertlv_parse_one(h2b(result[0]))
(tag, l, val, remainer) = bertlv_parse_one(h2b(result[0]))
self._cmd.poutput("set_data 0x%02x %s" % (t, b2h(val)))
else:
raise RuntimeError('Unsupported structure "%s" of file "%s"' % (structure, filename))

2
pySim/filesystem.py
View File

@@ -1260,7 +1260,7 @@ class RuntimeState(object):
if not isinstance(self.selected_file, BerTlvEF):
raise TypeError("Only works with BER-TLV EF")
data, sw = self.card._scc.retrieve_data(self.selected_file.fid, 0x5c)
tag, length, value = bertlv_parse_one(h2b(data))
tag, length, value, remainder = bertlv_parse_one(h2b(data))
return list(value)
def set_data(self, tag:int, data_hex:str):

6
pySim/utils.py
View File

@@ -155,7 +155,7 @@ def bertlv_encode_len(length:int) -> bytes:
else:
raise ValueError("Length > 32bits not supported")
def bertlv_parse_one(binary:bytes) -> (dict, int, bytes):
def bertlv_parse_one(binary:bytes) -> (dict, int, bytes, bytes):
"""Parse a single TLV IE at the start of the given binary data.
Args:
binary : binary input data of BER-TLV length field
@@ -164,7 +164,9 @@ def bertlv_parse_one(binary:bytes) -> (dict, int, bytes):
"""
(tagdict, remainder) = bertlv_parse_tag(binary)
(length, remainder) = bertlv_parse_len(remainder)
return (tagdict, length, remainder)
value = remainder[:length]
remainder = remainder[length:]
return (tagdict, length, value, remainder)