def _parse_definition_message(self, header):
# Read reserved byte and architecture byte to resolve endian
endian = '>' if self._read_struct('xB') else '<'
# Read rest of header with endian awareness
global_mesg_num, num_fields = self._read_struct('HB', endian=endian)
mesg_type = MESSAGE_TYPES.get(global_mesg_num)
field_defs = []
for n in range(num_fields):
field_def_num, field_size, base_type_num = self._read_struct('3B', endian=endian)
# Try to get field from message type (None if unknown)
field = mesg_type.fields.get(field_def_num) if mesg_type else None
base_type = BASE_TYPES.get(base_type_num, BASE_TYPE_BYTE)
if (field_size % base_type.size) != 0:
warnings.warn(
"Invalid field size %d for field '%s' of type '%s' (expected a multiple of %d); falling back to byte encoding." % (
field_size, field.name, base_type.name, base_type.size)
)
base_type = BASE_TYPE_BYTE
# If the field has components that are accumulators
# start recording their accumulation at 0
if field and field.components:
for component in field.components:
if component.accumulate:
accumulators = self._accumulators.setdefault(global_mesg_num, {})
accumulators[component.def_num] = 0
field_defs.append(FieldDefinition(
field=field,
def_num=field_def_num,
base_type=base_type,
size=field_size,
))
dev_field_defs = []
if header.is_developer_data:
num_dev_fields = self._read_struct('B', endian=endian)
for n in range(num_dev_fields):
field_def_num, field_size, dev_data_index = self._read_struct('3B', endian=endian)
field = self.get_dev_type(dev_data_index, field_def_num)
dev_field_defs.append(DevFieldDefinition(
field=field,
dev_data_index=dev_data_index,
def_num=field_def_num,
size=field_size
))
def_mesg = DefinitionMessage(
header=header,
endian=endian,
mesg_type=mesg_type,
mesg_num=global_mesg_num,
field_defs=field_defs,
dev_field_defs=dev_field_defs,
)
self._local_mesgs[header.local_mesg_num] = def_mesg
return def_mesg
def _parse_definition_message(self, header):
# Read reserved byte and architecture byte to resolve endian
endian = '>' if self._read_struct('xB') else '<'
# Read rest of header with endian awareness
global_mesg_num, num_fields = self._read_struct('HB', endian=endian)
mesg_type = MESSAGE_TYPES.get(global_mesg_num)
field_defs = []
for n in range(num_fields):
field_def_num, field_size, base_type_num = self._read_struct(
'3B', endian=endian)
# Try to get field from message type (None if unknown)
field = mesg_type.fields.get(field_def_num) if mesg_type else None
base_type = BASE_TYPES.get(base_type_num, BASE_TYPE_BYTE)
if (field_size % base_type.size) != 0:
# NOTE: we could fall back to byte encoding if there's any
# examples in the wild. For now, just throw an exception
raise FitParseError(
"Invalid field size %d for type '%s' (expected a multiple of %d)"
% (field_size, base_type.name, base_type.size))
# If the field has components that are accumulators
# start recording their accumulation at 0
if field is not None and hasattr(field, 'components'):
if field.components is not None:
for component in field.components:
if component.accumulate:
accumulators = self._accumulators.setdefault(
global_mesg_num, {})
accumulators[component.def_num] = 0
field_defs.append(
FieldDefinition(
field=field,
def_num=field_def_num,
base_type=base_type,
size=field_size,
))
def_mesg = DefinitionMessage(
header=header,
endian=endian,
mesg_type=mesg_type,
mesg_num=global_mesg_num,
field_defs=field_defs,
)
self._local_mesgs[header.local_mesg_num] = def_mesg
return def_mesg