mirror of https://gerrit.osmocom.org/pysim
Allow update_binary function to write more than 255 bytes
The T0 protocol (selected in transport/pcsc.py) does not support extended APDU, so 255 bytes is the maximum number of bytes that can be transmitted at a time. We can divide large data into 255 byte chunks. The read_binary function already has code to read more than 255 bytes, so we can just adapt it to the update_binary function. Change-Id: Icc240d5c8c04198640eb118565ea99f10ba27466changes/14/25114/1
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bb73e516cb
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2e6dc03f34
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@ -170,11 +170,23 @@ class SimCardCommands(object):
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return None, sw
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self.select_path(ef)
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pdu = self.cla_byte + 'd6%04x%02x' % (offset, data_length) + data
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res = self._tp.send_apdu_checksw(pdu)
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total_data = ''
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total_sw = "9000"
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chunk_offset = offset
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while chunk_offset < data_length:
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chunk_len = min(255, data_length - chunk_offset)
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# chunk_offset is bytes, but data slicing is hex chars, so we need to multiply by 2
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pdu = self.cla_byte + 'd6%04x%02x' % (chunk_offset, chunk_len) + data[chunk_offset*2 : (chunk_offset+chunk_len)*2]
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chunk_data, chunk_sw = self._tp.send_apdu(pdu)
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if chunk_sw == total_sw:
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total_data += chunk_data
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chunk_offset += chunk_len
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else:
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total_sw = chunk_sw
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raise ValueError('Failed to write chunk (chunk_offset %d, chunk_len %d)' % (chunk_offset, chunk_len))
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if verify:
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self.verify_binary(ef, data, offset)
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return res
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return total_data, total_sw
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def verify_binary(self, ef, data:str, offset:int=0):
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"""Verify contents of transparent EF.
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