def _open_file(self):
"""Open the configured file for processing"""
file_opened = False
while not self.stop_reading.isSet():
if dltlib.dlt_file_open(ctypes.byref(self), self.filename, self.verbose) >= DLT_RETURN_OK:
file_opened = True
break
if not self.live_run:
break
time.sleep(0.5)
if not file_opened:
logger.error("DLT FILE OPEN FAILED - Analysis will not be performed")
raise IOError(cDLT_FILE_NOT_OPEN_ERROR)
def generate_index(self):
"""Generate an index for the loaded DLT file
:returns: True if file had been previously read and the index is
successfully generated, otherwise False
:rtype: bool
"""
if not self.filename:
return False
self.indexed = False
if dltlib.dlt_file_open(ctypes.byref(self), self.filename,
self.verbose) >= DLT_RETURN_OK:
# load, analyse data file and create index list
if self.file_length == 0:
raise IOError(DLT_EMPTY_FILE_ERROR)
while self.file_position < self.file_length:
ret = dltlib.dlt_file_read(ctypes.byref(self), self.verbose)
if ret < DLT_RETURN_OK:
# - This can happen if either the frame's storage
# header could not be read correctly or the frame is
# corrupt. If the frame's storage header could not
# be read correctly we try to get the next storage
# header and continue indexing
next_header_position = self._find_next_header()
if next_header_position:
if self.file_position == next_header_position: # pylint: disable=no-else-break
# - This this implies that dltlib.dlt_read_file()
# returned due to an error other than invalid storage
# header because we already were at the correct
# header_position in the last iteration. So, we
# need to break out of the read/index loop.
break
else:
self.file_position = next_header_position
self.corrupt_msg_count += 1
else:
break
self.indexed = True
else:
raise IOError(cDLT_FILE_NOT_OPEN_ERROR)
return self.indexed