def get_dev_type(self, dev_data_index, field_def_num):
if dev_data_index not in self.dev_types:
if self.check_developer_data:
raise FitParseError(
"No such dev_data_index=%s found when looking up field %s" % (dev_data_index, field_def_num)
)
warnings.warn(
"Dev type for dev_data_index=%s missing. Adding dummy dev type." % (dev_data_index)
)
self._append_dev_data_id(dev_data_index)
dev_type = self.dev_types[dev_data_index]
if field_def_num not in dev_type['fields']:
if self.check_developer_data:
raise FitParseError(
"No such field %s for dev_data_index %s" % (field_def_num, dev_data_index)
)
warnings.warn(
"Field %s for dev_data_index %s missing. Adding dummy field." % (field_def_num, dev_data_index)
)
self._append_dev_field_description(
dev_data_index=dev_data_index,
field_def_num=field_def_num
)
return dev_type['fields'][field_def_num]
def get_dev_type(dev_data_index, field_def_num):
if dev_data_index not in DEV_TYPES:
raise FitParseError("No such dev_data_index=%s found when looking up field %s" % (dev_data_index, field_def_num))
elif field_def_num not in DEV_TYPES[dev_data_index]['fields']:
raise FitParseError("No such field %s for dev_data_index %s" % (field_def_num, dev_data_index))
return DEV_TYPES[dev_data_index]['fields'][field_def_num]
def add_dev_field_description(self, message):
dev_data_index = message.get_raw_value('developer_data_index')
field_def_num = message.get_raw_value('field_definition_number')
base_type_id = message.get_raw_value('fit_base_type_id')
field_name = message.get_raw_value('field_name') or "unnamed_dev_field_%s" % field_def_num
units = message.get_raw_value("units")
native_field_num = message.get_raw_value('native_field_num')
if dev_data_index not in self.dev_types:
if self.check_developer_data:
raise FitParseError("No such dev_data_index=%s found" % (dev_data_index))
warnings.warn(
"Dev type for dev_data_index=%s missing. Adding dummy dev type." % (dev_data_index)
)
self._append_dev_data_id(dev_data_index)
fields = self.dev_types[int(dev_data_index)]['fields']
# Note that nothing in the spec says overwriting an existing field is invalid
fields[field_def_num] = DevField(
dev_data_index=dev_data_index,
def_num=field_def_num,
type=BASE_TYPES[base_type_id],
name=field_name,
units=units,
native_field_num=native_field_num
)
def add_dev_field_description(message):
global DEV_TYPES
dev_data_index = message.get('developer_data_index').raw_value
field_def_num = message.get('field_definition_number').raw_value
base_type_id = message.get('fit_base_type_id').raw_value
field_name = message.get('field_name').raw_value
units = message.get('units').raw_value
native_field_num = message.get('native_field_num')
if native_field_num is not None:
native_field_num = native_field_num.raw_value
if dev_data_index not in DEV_TYPES:
raise FitParseError("No such dev_data_index=%s found" %
(dev_data_index))
fields = DEV_TYPES[int(dev_data_index)]['fields']
# Note that nothing in the spec says overwriting an existing field is invalid
fields[field_def_num] = DevField(dev_data_index=dev_data_index,
def_num=field_def_num,
type=BASE_TYPES[base_type_id],
name=field_name,
units=units,
native_field_num=native_field_num)
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 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 = 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 _read_struct(self, fmt, endian='<', data=None, always_tuple=False):
fmt_with_endian = endian + fmt
size = struct.calcsize(fmt_with_endian)
if size <= 0:
raise FitParseError("Invalid struct format: %s" % fmt_with_endian)
if data is None:
data = self._read(size)
unpacked = struct.unpack(fmt_with_endian, data)
# Flatten tuple if it's got only one value
return unpacked if (len(unpacked) > 1) or always_tuple else unpacked[0]
def _read_struct(self, fmt, endian='<', data=None, always_tuple=False):
fmt_with_endian = "%s%s" % (endian, fmt)
size = struct.calcsize(fmt_with_endian)
if size <= 0:
raise FitParseError("Invalid struct format: %s" % fmt_with_endian)
if data is None:
data = self._read(size)
if size != len(data):
raise FitEOFError("Tried to read %d bytes from .FIT file but got %d" % (size, len(data)))
unpacked = struct.unpack(fmt_with_endian, data)
# Flatten tuple if it's got only one value
return unpacked if (len(unpacked) > 1) or always_tuple else unpacked[0]
def _append_dev_field_description(self, dev_data_index, field_def_num, type=BASE_TYPE_BYTE, name=None,
units=None, native_field_num=None):
if dev_data_index not in self.dev_types:
if self.check_developer_data:
raise FitParseError("No such dev_data_index=%s found" % (dev_data_index))
warnings.warn(
"Dev type for dev_data_index=%s missing. Adding dummy dev type." % (dev_data_index)
)
self._append_dev_data_id(dev_data_index)
self.dev_types[dev_data_index]["fields"][field_def_num] = DevField(
dev_data_index=dev_data_index,
def_num=field_def_num,
type=type,
name=name,
units=units,
native_field_num=native_field_num
)
def _parse_data_message(self, header):
def_mesg = self._local_mesgs.get(header.local_mesg_num)
if not def_mesg:
raise FitParseError(
'Got data message with invalid local message type %d' %
(header.local_mesg_num))
raw_values = self._parse_raw_values_from_data_message(def_mesg)
field_datas = [
] # TODO: I don't love this name, update on DataMessage too
# TODO: Maybe refactor this and make it simpler (or at least broken
# up into sub-functions)
for field_def, raw_value in zip(
def_mesg.field_defs + def_mesg.dev_field_defs, raw_values):
field, parent_field = field_def.field, None
if field:
field, parent_field = self._resolve_subfield(
field, def_mesg, raw_values)
# Resolve component fields
if field.components:
for component in field.components:
# Render its raw value
cmp_raw_value = component.render(raw_value)
# Apply accumulated value
if component.accumulate:
accumulator = self._accumulators[def_mesg.mesg_num]
cmp_raw_value = self._apply_compressed_accumulation(
cmp_raw_value,
accumulator[component.def_num],
component.bits,
)
accumulator[component.def_num] = cmp_raw_value
# Apply scale and offset from component, not from the dynamic field
# as they may differ
cmp_raw_value = self._apply_scale_offset(
component, cmp_raw_value)
# Extract the component's dynamic field from def_mesg
cmp_field = def_mesg.mesg_type.fields[
component.def_num]
# Resolve a possible subfield
cmp_field, cmp_parent_field = self._resolve_subfield(
cmp_field, def_mesg, raw_values)
cmp_value = cmp_field.render(cmp_raw_value)
# Plop it on field_datas
field_datas.append(
FieldData(
field_def=None,
field=cmp_field,
parent_field=cmp_parent_field,
value=cmp_value,
raw_value=cmp_raw_value,
))
# TODO: Do we care about a base_type and a resolved field mismatch?
# My hunch is we don't
value = self._apply_scale_offset(field,
field.render(raw_value))
else:
value = raw_value
# Update compressed timestamp field
if (field_def.def_num
== FIELD_TYPE_TIMESTAMP.def_num) and (raw_value
is not None):
self._compressed_ts_accumulator = raw_value
field_datas.append(
FieldData(
field_def=field_def,
field=field,
parent_field=parent_field,
value=value,
raw_value=raw_value,
))
# Apply timestamp field if we got a header
if header.time_offset is not None:
ts_value = self._compressed_ts_accumulator = self._apply_compressed_accumulation(
header.time_offset,
self._compressed_ts_accumulator,
5,
)
field_datas.append(
FieldData(
field_def=None,
field=FIELD_TYPE_TIMESTAMP,
parent_field=None,
value=FIELD_TYPE_TIMESTAMP.render(ts_value),
raw_value=ts_value,
))
# Apply data processors
for field_data in field_datas:
# Apply type name processor
self._processor.run_type_processor(field_data)
self._processor.run_field_processor(field_data)
self._processor.run_unit_processor(field_data)
data_message = DataMessage(header=header,
def_mesg=def_mesg,
fields=field_datas)
self._processor.run_message_processor(data_message)
return data_message
