def apply_bitmask_to_list(reqIdrs: List, mask: bitarray):
if mask.length() == 0:
return reqIdrs, []
if len(reqIdrs) != mask.length():
raise LogicError(
"Length of reqIdr list and bitmask is not the same")
return BitmaskHelper.get_valid_reqs(
reqIdrs, mask), BitmaskHelper.get_invalid_reqs(reqIdrs, mask)
def store(self, address: int, size: str, value: bitarray):
points = self._get_pixels_by_address(address)
tmp = value[value.length() - 8:value.length()]
tmp_pos = 0
for point in points:
self._image.setPixel(
point[0], point[1],
int(tmp[tmp_pos:tmp_pos + self._mode.depth].to01(), 2))
tmp_pos += self._mode.depth
if size == 'word':
self.store(address=address + 1, size="byte", value=value[0:8])
def __zipBits(lng: bitarray, lat: bitarray):
latindex = 0
lngindex = 0
length = lng.length() + lat.length()
bits = bitarray(length)
for index in range(length):
if index % 2 == 0:
bits[index] = lng[lngindex]
lngindex += 1
else:
bits[index] = lat[latindex]
latindex += 1
return bits
def __calculateAdjacent(bits: bitarray, type):
positive = bits.copy()
negative = bits.copy()
length = bits.length()
index = -1
count = bits.count()
carrySubtract = True
carryAdd = True
if count == length and type == 'lat':
carryAdd = False
elif count == 0 and type == 'lat':
carrySubtract = False
while (carrySubtract or carryAdd) and abs(index) <= length:
value = bits[index]
if carrySubtract:
if value:
negative[index] = False
carrySubtract = False
else:
negative[index] = True
if carryAdd:
if value:
positive[index] = False
else:
positive[index] = True
carryAdd = False
index += -1
return negative, positive
def __splitBits(bits: bitarray):
lats = bitarray()
lngs = bitarray()
for index in range(bits.length()):
if index % 2 == 0:
lngs.append(bits[index])
else:
lats.append(bits[index])
return (lngs, lats)
def decode(self, coded_text: ba.bitarray) -> str:
"""
docstring
"""
reversed_dict = {v.to01(): k for k, v in self.code.items()}
result = []
for i in range(0, coded_text.length(), self.code_length):
try:
char_code = coded_text[i:i + self.code_length].to01()
result.append(reversed_dict[char_code])
except KeyError:
continue
return ''.join(result)
def decode(self, coded_text: ba.bitarray) -> str:
"""
docstring
"""
reversed_dict = {v.to01(): k for k, v in self.code.items()}
result = []
buffer = 0
for i in range(0, coded_text.length()):
try:
char_code = coded_text[i - buffer:i + 1].to01()
result.append(reversed_dict[char_code])
buffer = 0
except KeyError:
buffer += 1
continue
return ''.join(result)
def decode_msg_1(bit_arr: bitarray.bitarray) -> Dict[str, Any]:
"""
AIS Vessel position report using SOTDMA (Self-Organizing Time Division Multiple Access)
Src: https://gpsd.gitlab.io/gpsd/AIVDM.html#_types_1_2_and_3_position_report_class_a
"""
get_int_from_data = partial(get_int, bit_arr)
return {
'type': get_int_from_data(0, 6),
'repeat': get_int_from_data(6, 8),
'mmsi': get_int_from_data(8, 38),
'status': NavigationStatus(get_int_from_data(38, 42)),
'turn': get_int_from_data(42, 50, signed=True),
'speed': get_int_from_data(50, 60) / 10.0,
'accuracy': bit_arr[60],
'lon': get_int_from_data(61, 89, signed=True) / 600000.0,
'lat': get_int_from_data(89, 116, signed=True) / 600000.0,
'course': get_int_from_data(116, 128) * 0.1,
'heading': get_int_from_data(128, 137),
'second': get_int_from_data(137, 143),
'maneuver': ManeuverIndicator(get_int_from_data(143, 145)),
'raim': bit_arr[148],
'radio': get_int_from_data(149, bit_arr.length()),
}
def get_valid_count(mask: bitarray, len_reqIdr=0):
if mask.length() == 0:
return len_reqIdr
return mask.count(0)
def set_word(self, value: bitarray):
self._reset_integer_representations()
if value.length() != 16:
raise RegisterWrongNumberBits(16)
self._data[0:16] = value
def set_byte(self, value: bitarray):
self._reset_integer_representations()
if value.length() != 8:
raise RegisterWrongNumberBits(8)
self._data[8:16] = value
def set_word(self, value: bitarray):
if value.length() > 0 and value[-1] is True:
raise RegisterOddValue()
super().set_word(value)