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https://github.com/trezor/trezor-firmware.git
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use memoryviews in wire_codec
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parent
7570977cc4
commit
64746d01b4
@ -35,7 +35,6 @@ _MSG_FOOTER_LEN = ustruct.calcsize(_MSG_FOOTER)
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def parse_report(data):
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marker, session_id = ustruct.unpack(_REP_HEADER, data)
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# TODO: handle v1 protocol
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return marker, session_id, data[_REP_HEADER_LEN:]
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@ -77,7 +76,7 @@ Sends (msg_type, data_len) to target, followed by data chunks.
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Throws EOFError after last data chunk, in case of valid checksum.
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Throws MessageChecksumError to target if data doesn't match the checksum.
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'''
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message = yield # read first report
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message = memoryview((yield)) # read first report
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msg_type, data_len, data_tail = parse_message(message)
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target = genfunc(msg_type, data_len, session_id, *args)
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@ -86,11 +85,9 @@ Throws MessageChecksumError to target if data doesn't match the checksum.
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checksum = 0 # crc32
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nreports = 1
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compute_checksum = hasattr(ubinascii, 'crc32')
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while data_len > 0:
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if nreports > 1:
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data_tail = yield # read next report
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data_tail = memoryview((yield)) # read next report
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nreports += 1
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data_chunk = data_tail[:data_len] # slice off the garbage at the end
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@ -98,46 +95,35 @@ Throws MessageChecksumError to target if data doesn't match the checksum.
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data_len -= len(data_chunk)
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target.send(data_chunk)
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if compute_checksum:
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checksum = ubinascii.crc32(data_chunk, checksum) & 0xffffffff
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checksum = ubinascii.crc32(data_chunk, checksum)
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msg_footer = data_tail[:_MSG_FOOTER_LEN]
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if len(msg_footer) < _MSG_FOOTER_LEN:
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data_tail = yield # read report with the rest of checksum
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msg_footer += data_tail[:_MSG_FOOTER_LEN - len(msg_footer)]
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if compute_checksum:
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data_checksum, = parse_message_footer(msg_footer)
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else:
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data_checksum = checksum
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data_checksum, = parse_message_footer(msg_footer)
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if data_checksum != checksum:
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target.throw(MessageChecksumError(
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'Message checksum mismatch, expected %d, received %d' % (checksum, data_checksum)))
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target.throw(MessageChecksumError((checksum, data_checksum)))
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else:
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target.throw(EOFError())
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def encode_wire_message(msg_type, msg_data, session_id, target):
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report = bytearray(_REP_LEN)
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report = memoryview(bytearray(_REP_LEN))
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serialize_report_header(report, REP_MARKER_HEADER, session_id)
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serialize_message_header(report, msg_type, len(msg_data))
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msg_data = memoryview(msg_data)
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report = memoryview(report)
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source_data = msg_data
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source_data = memoryview(msg_data)
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target_data = report[_REP_HEADER_LEN + _MSG_HEADER_LEN:]
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compute_checksum = hasattr(ubinascii, 'crc32')
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if compute_checksum:
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checksum = ubinascii.crc32(msg_data) & 0xffffffff
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else:
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checksum = 0
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checksum = ubinascii.crc32(msg_data)
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msg_footer = bytearray(_MSG_FOOTER_LEN)
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serialize_message_footer(msg_footer, checksum)
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first = True
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while True:
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# move as much as possible from source to target
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n = min(len(target_data), len(source_data))
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@ -157,8 +143,10 @@ def encode_wire_message(msg_type, msg_data, session_id, target):
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break
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# reset to skip the magic and session ID
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serialize_report_header(report, REP_MARKER_DATA, session_id)
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target_data = report[_REP_HEADER_LEN:]
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if first:
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serialize_report_header(report, REP_MARKER_DATA, session_id)
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target_data = report[_REP_HEADER_LEN:]
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first = False
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def encode_session_open_message(session_id, target):
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