mirror of https://gerrit.osmocom.org/pysim
ts_102_221: The BTLV IEs FILE SIZE and TOTAL FILE SIZE have a min length
The TLV IEs FILE SIZE and TOTAL FILE SIZE have a minimum length of 2 byte. Even when the length is in the single digit range two bytes must be used. See also: ETSI TS 102 221, section 11.1.1.4.1 and 11.1.1.4.2 Change-Id: Ief113ce8fe3bcae2c9fb2ff4138df9ccf98d26ff
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@ -208,10 +208,11 @@ def GsmString(n):
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class GreedyInteger(Construct):
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"""A variable-length integer implementation, think of combining GrredyBytes with BytesInteger."""
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def __init__(self, signed=False, swapped=False):
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def __init__(self, signed=False, swapped=False, minlen=0):
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super().__init__()
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self.signed = signed
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self.swapped = swapped
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self.minlen = minlen
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def _parse(self, stream, context, path):
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data = stream_read_entire(stream, path)
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@ -239,6 +240,8 @@ class GreedyInteger(Construct):
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if not isinstance(obj, integertypes):
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raise IntegerError(f"value {obj} is not an integer", path=path)
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length = self.__bytes_required(obj)
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if length < self.minlen:
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length = length + (self.minlen - length)
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try:
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data = integer2bytes(obj, length, self.signed)
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except ValueError as e:
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@ -80,11 +80,11 @@ ts_102_22x_cmdset = CardCommandSet('TS 102 22x', [
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# ETSI TS 102 221 11.1.1.4.2
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class FileSize(BER_TLV_IE, tag=0x80):
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_construct = GreedyInteger()
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_construct = GreedyInteger(minlen=2)
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# ETSI TS 102 221 11.1.1.4.2
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class TotalFileSize(BER_TLV_IE, tag=0x81):
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_construct = GreedyInteger()
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_construct = GreedyInteger(minlen=2)
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# ETSI TS 102 221 11.1.1.4.3
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class FileDescriptor(BER_TLV_IE, tag=0x82):
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