def test_severity_behaviour(self):
dtc = Dtc(1)
self.assertEqual(dtc.severity.get_byte_as_int(), 0x00)
dtc.severity.maintenance_only = True
self.assertEqual(dtc.severity.get_byte_as_int(), 0x20)
dtc.severity.check_at_next_exit = True
self.assertEqual(dtc.severity.get_byte_as_int(), 0x60)
dtc.severity.check_immediately = True
self.assertEqual(dtc.severity.get_byte_as_int(), 0xE0)
dtc.severity.set_byte(0x20)
self.assertEqual(dtc.severity.maintenance_only, True)
self.assertEqual(dtc.severity.check_at_next_exit, False)
self.assertEqual(dtc.severity.check_immediately, False)
dtc.severity.set_byte(0x60)
self.assertEqual(dtc.severity.maintenance_only, True)
self.assertEqual(dtc.severity.check_at_next_exit, True)
self.assertEqual(dtc.severity.check_immediately, False)
dtc.severity.set_byte(0xE0)
self.assertEqual(dtc.severity.maintenance_only, True)
self.assertEqual(dtc.severity.check_at_next_exit, True)
self.assertEqual(dtc.severity.check_immediately, True)
def test_init(self):
dtc = Dtc(0x1234)
self.assertEqual(dtc.id, 0x1234)
self.assertEqual(dtc.status.get_byte(), b'\x00')
self.assertEqual(dtc.status.get_byte_as_int(), 0x00)
self.assertEqual(dtc.severity.get_byte(), b'\x00')
self.assertEqual(dtc.severity.get_byte_as_int(), 0x00)
self.assertEqual(dtc.status.test_failed, False)
self.assertEqual(dtc.status.test_failed_this_operation_cycle, False)
self.assertEqual(dtc.status.pending, False)
self.assertEqual(dtc.status.confirmed, False)
self.assertEqual(dtc.status.test_not_completed_since_last_clear, False)
self.assertEqual(dtc.status.test_failed_since_last_clear, False)
self.assertEqual(dtc.status.test_not_completed_this_operation_cycle,
False)
self.assertEqual(dtc.status.warning_indicator_requested, False)
with self.assertRaises(TypeError):
Dtc()
def read_dtcs(
flash_info: constants.FlashInfo,
interface="CAN",
callback=None,
interface_path=None,
status_mask=None,
):
if status_mask is None:
# Try to filter to reasonable failures only.
status_mask = Dtc.Status(
test_failed=True,
test_failed_this_operation_cycle=True,
pending=False,
confirmed=True,
test_not_completed_since_last_clear=False,
test_failed_since_last_clear=True,
test_not_completed_this_operation_cycle=False,
warning_indicator_requested=True,
)
conn = connection_setup(
interface=interface,
rxid=flash_info.control_module_identifier.rxid,
txid=flash_info.control_module_identifier.txid,
interface_path=interface_path,
)
with Client(conn, request_timeout=5,
config=configs.default_client_config) as client:
if callback:
callback(
flasher_step="READING",
flasher_status="Connected",
flasher_progress=50,
)
client.change_session(services.DiagnosticSessionControl.Session.
extendedDiagnosticSession)
response = client.get_dtc_by_status_mask(status_mask.get_byte_as_int())
if callback:
callback(
flasher_step="DONE",
flasher_status="Read " + str(len(response.service_data.dtcs)) +
" DTCs",
flasher_progress=100,
)
return dtc_handler.dtcs_to_human(response.service_data.dtcs)
def test_str_repr(self):
dtc = Dtc(0x123456)
dtc.status.pending = True
str(dtc)
dtc.__repr__()
def test_set_severity_with_byte_no_error(self):
dtc = Dtc(1)
for i in range(255):
dtc.severity.set_byte(i)
def test_status_behaviour(self):
dtc = Dtc(1)
self.assertEqual(dtc.status.get_byte(), b'\x00')
dtc.status.test_failed = True
self.assertEqual(dtc.status.get_byte(), b'\x01')
dtc.status.test_failed_this_operation_cycle = True
self.assertEqual(dtc.status.get_byte(), b'\x03')
dtc.status.pending = True
self.assertEqual(dtc.status.get_byte(), b'\x07')
dtc.status.confirmed = True
self.assertEqual(dtc.status.get_byte(), b'\x0F')
dtc.status.test_not_completed_since_last_clear = True
self.assertEqual(dtc.status.get_byte(), b'\x1F')
dtc.status.test_failed_since_last_clear = True
self.assertEqual(dtc.status.get_byte(), b'\x3F')
dtc.status.test_not_completed_this_operation_cycle = True
self.assertEqual(dtc.status.get_byte(), b'\x7F')
dtc.status.warning_indicator_requested = True
self.assertEqual(dtc.status.get_byte(), b'\xFF')
dtc.status.set_byte(0x01)
self.assertEqual(dtc.status.test_failed, True)
self.assertEqual(dtc.status.test_failed_this_operation_cycle, False)
self.assertEqual(dtc.status.pending, False)
self.assertEqual(dtc.status.confirmed, False)
self.assertEqual(dtc.status.test_not_completed_since_last_clear, False)
self.assertEqual(dtc.status.test_failed_since_last_clear, False)
self.assertEqual(dtc.status.test_not_completed_this_operation_cycle,
False)
self.assertEqual(dtc.status.warning_indicator_requested, False)
dtc.status.set_byte(0x03)
self.assertEqual(dtc.status.test_failed, True)
self.assertEqual(dtc.status.test_failed_this_operation_cycle, True)
self.assertEqual(dtc.status.pending, False)
self.assertEqual(dtc.status.confirmed, False)
self.assertEqual(dtc.status.test_not_completed_since_last_clear, False)
self.assertEqual(dtc.status.test_failed_since_last_clear, False)
self.assertEqual(dtc.status.test_not_completed_this_operation_cycle,
False)
self.assertEqual(dtc.status.warning_indicator_requested, False)
dtc.status.set_byte(0x07)
self.assertEqual(dtc.status.test_failed, True)
self.assertEqual(dtc.status.test_failed_this_operation_cycle, True)
self.assertEqual(dtc.status.pending, True)
self.assertEqual(dtc.status.confirmed, False)
self.assertEqual(dtc.status.test_not_completed_since_last_clear, False)
self.assertEqual(dtc.status.test_failed_since_last_clear, False)
self.assertEqual(dtc.status.test_not_completed_this_operation_cycle,
False)
self.assertEqual(dtc.status.warning_indicator_requested, False)
dtc.status.set_byte(0x0F)
self.assertEqual(dtc.status.test_failed, True)
self.assertEqual(dtc.status.test_failed_this_operation_cycle, True)
self.assertEqual(dtc.status.pending, True)
self.assertEqual(dtc.status.confirmed, True)
self.assertEqual(dtc.status.test_not_completed_since_last_clear, False)
self.assertEqual(dtc.status.test_failed_since_last_clear, False)
self.assertEqual(dtc.status.test_not_completed_this_operation_cycle,
False)
self.assertEqual(dtc.status.warning_indicator_requested, False)
dtc.status.set_byte(0x1F)
self.assertEqual(dtc.status.test_failed, True)
self.assertEqual(dtc.status.test_failed_this_operation_cycle, True)
self.assertEqual(dtc.status.pending, True)
self.assertEqual(dtc.status.confirmed, True)
self.assertEqual(dtc.status.test_not_completed_since_last_clear, True)
self.assertEqual(dtc.status.test_failed_since_last_clear, False)
self.assertEqual(dtc.status.test_not_completed_this_operation_cycle,
False)
self.assertEqual(dtc.status.warning_indicator_requested, False)
dtc.status.set_byte(0x3F)
self.assertEqual(dtc.status.test_failed, True)
self.assertEqual(dtc.status.test_failed_this_operation_cycle, True)
self.assertEqual(dtc.status.pending, True)
self.assertEqual(dtc.status.confirmed, True)
self.assertEqual(dtc.status.test_not_completed_since_last_clear, True)
self.assertEqual(dtc.status.test_failed_since_last_clear, True)
self.assertEqual(dtc.status.test_not_completed_this_operation_cycle,
False)
self.assertEqual(dtc.status.warning_indicator_requested, False)
dtc.status.set_byte(0x7F)
self.assertEqual(dtc.status.test_failed, True)
self.assertEqual(dtc.status.test_failed_this_operation_cycle, True)
self.assertEqual(dtc.status.pending, True)
self.assertEqual(dtc.status.confirmed, True)
self.assertEqual(dtc.status.test_not_completed_since_last_clear, True)
self.assertEqual(dtc.status.test_failed_since_last_clear, True)
self.assertEqual(dtc.status.test_not_completed_this_operation_cycle,
True)
self.assertEqual(dtc.status.warning_indicator_requested, False)
dtc.status.set_byte(0xFF)
self.assertEqual(dtc.status.test_failed, True)
self.assertEqual(dtc.status.test_failed_this_operation_cycle, True)
self.assertEqual(dtc.status.pending, True)
self.assertEqual(dtc.status.confirmed, True)
self.assertEqual(dtc.status.test_not_completed_since_last_clear, True)
self.assertEqual(dtc.status.test_failed_since_last_clear, True)
self.assertEqual(dtc.status.test_not_completed_this_operation_cycle,
True)
self.assertEqual(dtc.status.warning_indicator_requested, True)
def test_set_status_with_byte_no_error(self):
dtc = Dtc(1)
for i in range(255):
dtc.status.set_byte(i)
def interpret_response(cls,
response,
subfunction,
extended_data_size=None,
tolerate_zero_padding=True,
ignore_all_zero_dtc=True,
dtc_snapshot_did_size=2,
didconfig=None):
u"""
Populates the response ``service_data`` property with an instance of :class:`ReadDTCInformation.ResponseData<udsoncan.services.ReadDTCInformation.ResponseData>`
:param response: The received response to interpret
:type response: :ref:`Response<Response>`
:param subfunction: The service subfunction. Values are defined in :class:`ReadDTCInformation.Subfunction<udsoncan.services.ReadDTCInformation.Subfunction>`
:type subfunction: int
:param extended_data_size: Extended data size to expect. Extended data is implementation specific, therefore, size is not standardized
:type extended_data_size: int
:param tolerate_zero_padding: Ignore trailing zeros in the response data avoiding raising false :class:`InvalidResponseException<udsoncan.exceptions.InvalidResponseException>`.
:type tolerate_zero_padding: bool
:param ignore_all_zero_dtc: Discard any DTC entries that have an ID of 0. Avoid reading extra DTCs when using a transport protocol using zero padding.
:type ignore_all_zero_dtc: bool
:param dtc_snapshot_did_size: Number of bytes to encode the data identifier number. Other services such as :ref:`ReadDataByIdentifier<ReadDataByIdentifier>` encode DID over 2 bytes.
UDS standard does not define the size of the snapshot DID, therefore, it must be supplied.
:type dtc_snapshot_did_size: int
:param didconfig: Definition of DID codecs. Dictionary mapping a DID (int) to a valid :ref:`DidCodec<DidCodec>` class or pack/unpack string
:type didconfig: dict[int] = :ref:`DidCodec<DidCodec>`
:raises InvalidResponseException: If response length is wrong or does not match DID configuration
:raises ValueError: If parameters are out of range, missing or wrong types
:raises ConfigError: If the server returns a snapshot DID not defined in ``didconfig``
"""
from udsoncan import Dtc, DidCodec
ServiceHelper.validate_int(subfunction,
min=1,
max=0x15,
name=u'Subfunction')
# Response grouping for responses that are encoded the same way
response_subfn_dtc_availability_mask_plus_dtc_record = [
ReadDTCInformation.Subfunction.reportDTCByStatusMask,
ReadDTCInformation.Subfunction.reportSupportedDTCs,
ReadDTCInformation.Subfunction.reportFirstTestFailedDTC,
ReadDTCInformation.Subfunction.reportFirstConfirmedDTC,
ReadDTCInformation.Subfunction.reportMostRecentTestFailedDTC,
ReadDTCInformation.Subfunction.reportMostRecentConfirmedDTC,
ReadDTCInformation.Subfunction.reportMirrorMemoryDTCByStatusMask,
ReadDTCInformation.Subfunction.
reportEmissionsRelatedOBDDTCByStatusMask,
ReadDTCInformation.Subfunction.reportDTCWithPermanentStatus
]
response_subfn_number_of_dtc = [
ReadDTCInformation.Subfunction.reportNumberOfDTCByStatusMask,
ReadDTCInformation.Subfunction.
reportNumberOfDTCBySeverityMaskRecord,
ReadDTCInformation.Subfunction.
reportNumberOfMirrorMemoryDTCByStatusMask,
ReadDTCInformation.Subfunction.
reportNumberOfEmissionsRelatedOBDDTCByStatusMask,
]
response_subfn_dtc_availability_mask_plus_dtc_record_with_severity = [
ReadDTCInformation.Subfunction.reportDTCBySeverityMaskRecord,
ReadDTCInformation.Subfunction.reportSeverityInformationOfDTC
]
response_subfn_dtc_plus_fault_counter = [
ReadDTCInformation.Subfunction.reportDTCFaultDetectionCounter
]
response_subfn_dtc_plus_sapshot_record = [
ReadDTCInformation.Subfunction.reportDTCSnapshotIdentification
]
response_sbfn_dtc_status_snapshots_records = [
ReadDTCInformation.Subfunction.reportDTCSnapshotRecordByDTCNumber
]
response_sbfn_dtc_status_snapshots_records_record_first = [
ReadDTCInformation.Subfunction.
reportDTCSnapshotRecordByRecordNumber
]
response_subfn_mask_record_plus_extdata = [
ReadDTCInformation.Subfunction.
reportDTCExtendedDataRecordByDTCNumber, ReadDTCInformation.
Subfunction.reportMirrorMemoryDTCExtendedDataRecordByDTCNumber
]
response.service_data = cls.ResponseData() # what will be returned
if len(response.data) < 1:
raise InvalidResponseException(
response,
u'Response must be at least 1 byte long (echo of subfunction)')
response.service_data.subfunction_echo = ord(
response.data[0]) # First byte is subfunction
# Now for each response group, we have a different decoding algorithm
if subfunction in response_subfn_dtc_availability_mask_plus_dtc_record + response_subfn_dtc_availability_mask_plus_dtc_record_with_severity:
if subfunction in response_subfn_dtc_availability_mask_plus_dtc_record:
dtc_size = 4 # DTC ID (3) + Status (1)
elif subfunction in response_subfn_dtc_availability_mask_plus_dtc_record_with_severity:
dtc_size = 6 # DTC ID (3) + Status (1) + Severity (1) + FunctionalUnit (1)
if len(response.data) < 2:
raise InvalidResponseException(
response,
u'Response must be at least 2 byte long (echo of subfunction and DTCStatusAvailabilityMask)'
)
response.service_data.status_availability = Dtc.Status.from_byte(
ord(response.data[1]))
actual_byte = 2 # Increasing index
while True: # Loop until we have read all dtcs
if len(response.data) <= actual_byte:
break # done
elif len(response.data) < actual_byte + dtc_size:
partial_dtc_length = len(response.data) - actual_byte
if tolerate_zero_padding and response.data[
actual_byte:] == '\x00' * partial_dtc_length:
break
else:
# We purposely ignore extra byte for subfunction reportSeverityInformationOfDTC as it is supposed to return 0 or 1 DTC.
if subfunction != ReadDTCInformation.Subfunction.reportSeverityInformationOfDTC or actual_byte == 2:
raise InvalidResponseException(
response,
u'Incomplete DTC record. Missing %d bytes to response to complete the record'
% (dtc_size - partial_dtc_length))
else:
dtc_bytes = response.data[actual_byte:actual_byte +
dtc_size]
if dtc_bytes == '\x00' * dtc_size and ignore_all_zero_dtc:
pass # ignore
else:
if subfunction in response_subfn_dtc_availability_mask_plus_dtc_record:
dtc = Dtc(
struct.unpack(u'>L',
'\x00' + dtc_bytes[0:3])[0])
dtc.status.set_byte(ord(dtc_bytes[3]))
elif subfunction in response_subfn_dtc_availability_mask_plus_dtc_record_with_severity:
dtc = Dtc(
struct.unpack(u'>L',
'\x00' + dtc_bytes[2:5])[0])
dtc.severity.set_byte(ord(dtc_bytes[0]))
dtc.functional_unit = ord(dtc_bytes[1])
dtc.status.set_byte(ord(dtc_bytes[5]))
response.service_data.dtcs.append(dtc)
actual_byte += dtc_size
response.service_data.dtc_count = len(response.service_data.dtcs)
# The 2 following subfunction responses have different purposes but their constructions are very similar.
elif subfunction in response_subfn_dtc_plus_fault_counter + response_subfn_dtc_plus_sapshot_record:
dtc_size = 4
if len(response.data) < 1:
raise InvalidResponseException(
response,
u'Response must be at least 1 byte long (echo of subfunction)'
)
actual_byte = 1 # Increasing index
dtc_map = dict(
) # This map is used to append snapshot to existing DTC.
while True: # Loop until we have read all dtcs
if len(response.data) <= actual_byte:
break # done
elif len(response.data) < actual_byte + dtc_size:
partial_dtc_length = len(response.data) - actual_byte
if tolerate_zero_padding and response.data[
actual_byte:] == '\x00' * partial_dtc_length:
break
else:
raise InvalidResponseException(
response,
u'Incomplete DTC record. Missing %d bytes to response to complete the record'
% (dtc_size - partial_dtc_length))
else:
dtc_bytes = response.data[actual_byte:actual_byte +
dtc_size]
if dtc_bytes == '\x00' * dtc_size and ignore_all_zero_dtc:
pass # ignore
else:
dtcid = struct.unpack(u'>L',
'\x00' + dtc_bytes[0:3])[0]
# We create the DTC or get its reference if already created.
dtc_created = False
if dtcid in dtc_map and subfunction in response_subfn_dtc_plus_sapshot_record:
dtc = dtc_map[dtcid]
else:
dtc = Dtc(dtcid)
dtc_map[dtcid] = dtc
dtc_created = True
# We either read the DTC fault counter or Snapshot record number.
if subfunction in response_subfn_dtc_plus_fault_counter:
dtc.fault_counter = ord(dtc_bytes[3])
elif subfunction in response_subfn_dtc_plus_sapshot_record:
record_number = ord(dtc_bytes[3])
if dtc.snapshots is None:
dtc.snapshots = []
dtc.snapshots.append(record_number)
# Adds the DTC to the list.
if dtc_created:
response.service_data.dtcs.append(dtc)
actual_byte += dtc_size
response.service_data.dtc_count = len(response.service_data.dtcs)
# This group of responses returns a number of DTCs available
elif subfunction in response_subfn_number_of_dtc:
if len(response.data) < 5:
raise InvalidResponseException(
response, u'Response must be exactly 5 bytes long ')
response.service_data.status_availability = Dtc.Status.from_byte(
ord(response.data[1]))
response.service_data.dtc_format = ord(response.data[2])
response.service_data.dtc_count = struct.unpack(
u'>H', response.data[3:5])[0]
# This group of responses returns DTC snapshots
# Responses include a DTC, many snapshot records. For each record, we find many Data Identifiers.
# We create one Dtc.Snapshot for each DID. That'll be easier to work with.
# <DTC,RecordNumber1,NumberOfDid_X,DID1,DID2,...DIDX, RecordNumber2,NumberOfDid_Y,DID1,DID2,...DIDY, etc>
elif subfunction in response_sbfn_dtc_status_snapshots_records:
if len(response.data) < 5:
raise InvalidResponseException(
response, u'Response must be at least 5 bytes long ')
dtc = Dtc(struct.unpack(u'>L', '\x00' + response.data[1:4])[0])
dtc.status.set_byte(ord(response.data[4]))
actual_byte = 5 # Increasing index
ServiceHelper.validate_int(dtc_snapshot_did_size,
min=1,
max=8,
name=u'dtc_snapshot_did_size')
while True: # Loop until we have read all dtcs
if len(response.data) <= actual_byte:
break # done
remaining_data = response.data[actual_byte:]
if tolerate_zero_padding and remaining_data == '\x00' * len(
remaining_data):
break
if len(remaining_data) < 2:
raise InvalidResponseException(
response,
u'Incomplete response from server. Missing "number of identifier" and following data'
)
record_number = ord(remaining_data[0])
number_of_did = ord(remaining_data[1])
# Validate record number and number of DID before continuing
if number_of_did == 0:
raise InvalidResponseException(
response,
u'Server returned snapshot record #%d with no data identifier included'
% (record_number))
if len(remaining_data) < 2 + dtc_snapshot_did_size:
raise InvalidResponseException(
response,
u'Incomplete response from server. Missing DID number and associated data.'
)
actual_byte += 2
for i in xrange(number_of_did):
remaining_data = response.data[actual_byte:]
snapshot = Dtc.Snapshot(
) # One snapshot per DID for convenience.
snapshot.record_number = record_number
# As standard does not specify the length of the DID, we craft it based on a config
did = 0
for j in xrange(dtc_snapshot_did_size):
offset = dtc_snapshot_did_size - 1 - j
did |= (ord(remaining_data[offset]) << (8 * j))
# Decode the data based on DID number.
snapshot.did = did
didconfig = ServiceHelper.check_did_config(did, didconfig)
codec = DidCodec.from_config(didconfig[did])
data_offset = dtc_snapshot_did_size
if len(remaining_data[data_offset:]) < len(codec):
raise InvalidResponseException(
response,
u'Incomplete response. Data for DID 0x%04x is only %d bytes while %d bytes is expected'
% (did, len(
remaining_data[data_offset:]), len(codec)))
snapshot.raw_data = remaining_data[
data_offset:data_offset + len(codec)]
snapshot.data = codec.decode(snapshot.raw_data)
dtc.snapshots.append(snapshot)
actual_byte += dtc_snapshot_did_size + len(codec)
response.service_data.dtcs.append(dtc)
response.service_data.dtc_count = 1
# This group of responses returns DTC snapshots
# Responses include a DTC, many snapshots records. For each record, we find many Data Identifiers.
# We create one Dtc.Snapshot for each DID. That'll be easier to work with.
# Similar to previous subfunction group, but order of information is changed.
# <RecordNumber1, DTC1,NumberOfDid_X,DID1,DID2,...DIDX, RecordNumber2,DTC2, NumberOfDid_Y,DID1,DID2,...DIDY, etc>
elif subfunction in response_sbfn_dtc_status_snapshots_records_record_first:
ServiceHelper.validate_int(dtc_snapshot_did_size,
min=1,
max=8,
name=u'dtc_snapshot_did_size')
if len(response.data) < 2:
raise InvalidResponseException(
response,
u'Response must be at least 2 bytes long. Subfunction echo + RecordNumber '
)
actual_byte = 1 # Increasing index
while True: # Loop through response data
if len(response.data) <= actual_byte:
break # done
remaining_data = response.data[actual_byte:]
record_number = ord(remaining_data[0])
# If empty response but filled with 0, it is considered ok
if remaining_data == '\x00' * len(
remaining_data) and tolerate_zero_padding:
break
# If record number received but no DTC provided (allowed according to standard), we exit.
if len(remaining_data
) == 1 or tolerate_zero_padding and remaining_data[
1:] == '\x00' * len(remaining_data[1:]):
break
if len(remaining_data
) < 5: # Partial DTC (No DTC at all is checked above)
raise InvalidResponseException(
response,
u'Incomplete response from server. Missing "DTCAndStatusRecord" and following data'
)
if len(remaining_data) < 6:
raise InvalidResponseException(
response,
u'Incomplete response from server. Missing number of data identifier'
)
# DTC decoding
dtc = Dtc(
struct.unpack(u'>L', '\x00' + remaining_data[1:4])[0])
dtc.status.set_byte(ord(remaining_data[4]))
number_of_did = ord(remaining_data[5])
actual_byte += 6
remaining_data = response.data[actual_byte:]
if number_of_did == 0:
raise InvalidResponseException(
response,
u'Server returned snapshot record #%d with no data identifier included'
% (record_number))
if len(remaining_data) < dtc_snapshot_did_size:
raise InvalidResponseException(
response,
u'Incomplete response from server. Missing DID and associated data'
)
# We have a DTC and 0 DID, next loop
if tolerate_zero_padding and remaining_data == '\x00' * len(
remaining_data):
break
# For each DID
for i in xrange(number_of_did):
remaining_data = response.data[actual_byte:]
snapshot = Dtc.Snapshot(
) # One snapshot epr DID for convenience
snapshot.record_number = record_number
# As standard does not specify the length of the DID, we craft it based on a config
did = 0
for j in xrange(dtc_snapshot_did_size):
offset = dtc_snapshot_did_size - 1 - j
did |= (ord(remaining_data[offset]) << (8 * j))
# Decode the data based on DID number.
snapshot.did = did
didconfig = ServiceHelper.check_did_config(did, didconfig)
codec = DidCodec.from_config(didconfig[did])
data_offset = dtc_snapshot_did_size
if len(remaining_data[data_offset:]) < len(codec):
raise InvalidResponseException(
response,
u'Incomplete response. Data for DID 0x%04x is only %d bytes while %d bytes is expected'
% (did, len(
remaining_data[data_offset:]), len(codec)))
snapshot.raw_data = remaining_data[
data_offset:data_offset + len(codec)]
snapshot.data = codec.decode(snapshot.raw_data)
dtc.snapshots.append(snapshot)
actual_byte += dtc_snapshot_did_size + len(codec)
response.service_data.dtcs.append(dtc)
response.service_data.dtc_count = len(response.service_data.dtcs)
# These subfunctions include DTC ExtraData. We give it raw to user.
elif subfunction in response_subfn_mask_record_plus_extdata:
cls.assert_extended_data_size(extended_data_size, subfunction)
if len(response.data) < 5:
raise InvalidResponseException(
response,
u'Incomplete response from server. Missing DTCAndStatusRecord'
)
# DTC decoding
dtc = Dtc(struct.unpack(u'>L', '\x00' + response.data[1:4])[0])
dtc.status.set_byte(ord(response.data[4]))
actual_byte = 5 # Increasing index
while actual_byte < len(response.data): # Loop through data
remaining_data = response.data[actual_byte:]
record_number = ord(remaining_data[0])
if record_number == 0:
if remaining_data == '\x00' * len(
remaining_data) and tolerate_zero_padding:
break
else:
raise InvalidResponseException(
response,
u'Extended data record number given by the server is 0 but this value is a reserved value.'
)
actual_byte += 1
remaining_data = response.data[actual_byte:]
if len(remaining_data) < extended_data_size:
raise InvalidResponseException(
response,
u'Incomplete response from server. Length of extended data for DTC 0x%06x with record number 0x%02x is %d bytes but smaller than given data_size of %d bytes'
% (dtc.id, record_number, len(remaining_data),
extended_data_size))
exdata = Dtc.ExtendedData()
exdata.record_number = record_number
exdata.raw_data = remaining_data[0:extended_data_size]
dtc.extended_data.append(exdata)
actual_byte += extended_data_size
response.service_data.dtcs.append(dtc)
response.service_data.dtc_count = len(response.service_data.dtcs)