def parse_dci_0_0(dci_hex_bytes):
dci = pd.Series()
bit_stream = bitstring.BitStream(dci_hex_bytes)
dci['ul_fmt'] = bit_stream.read('uint:1')
#dci['rballoc_type'] = bit_stream.read('uint:1')
#dci['riv'] = bit_stream.read('uint:16')
dci['ul_startPrb'], dci['ul_Prbnum'] = riv2startandlen(bit_stream.read('uint:16'), bwp_rbnum=51)
dci['ul_timealloc'] = bit_stream.read('uint:2')
dci['ul_hop'] = bit_stream.read('uint:1')
dci['ul_mcs'] = bit_stream.read('uint:5')
dci['ul_ndi'] = bit_stream.read('uint:1')
dci['ul_rv'] = bit_stream.read('uint:2')
dci['ul_harqid'] = bit_stream.read('uint:4')
dci['ul_tpc'] = bit_stream.read('uint:2')
return dci
def bins_from_string(bs, search_header=True):
"""
:param bs:
:param search_header:
:return:
:rtype: bitstring.BitStream
"""
header = b'BUFR'
if search_header:
idx_header = bs.find(header)
if idx_header != -1:
bs = bs[bs.find(header):]
else:
raise BpclError('Cannot find starting signature: {}'.format(header))
return bitstring.BitStream(bytes=bs)
def write_ts(bs, new_ts):
new_ts_bin = bin(new_ts)
new_ts_bin_len = len(new_ts_bin) - 2
ts_bits33 = bitstring.BitStream(length=33)
ts_bits33.overwrite(new_ts_bin, pos=-new_ts_bin_len)
ts_bits33.pos = 0
# print('writ', ts_bits33.bin)
part1 = ts_bits33.read(3)
part2 = ts_bits33.read(15)
part3 = ts_bits33.read(15)
bs.pos += 4
bs.overwrite(part1)
bs.pos += 1
bs.overwrite(part2)
bs.pos += 1
bs.overwrite(part3)
bs.pos += 1
def sendCmdToQueue(self, command: bytes, data: bytes):
# attachData = None
# if data is not None and len(data) > 0:
# attachData = True
stream = bitstring.BitStream()
stream.append("int:32=" + str(len(self.sessionId)))
stream.append(bytearray(self.sessionId, encoding="utf-8"))
stream.append("int:8=" + str(command))
if data is not None:
stream.append(data)
self.commandChannel.basic_publish(exchange=self.commandExchangeName,
routing_key="",
body=stream.bytes)
def __init__(self, master=None):
self.nb = 1024
self.chipNum = 0
self.bitFlips = None
self.bits = bitstring.BitStream(uint=0, length=self.nb)
self.reset()
self.bigfont = tkFont.Font(family="Helvetica", size=12)
self.font = tkFont.Font(family="Helvetica", size=10)
self.squareSize = int(math.sqrt(self.nb))
self.zoomFactor = int(480 / self.squareSize)
self.colorMapFun = self.mapBitGrayscale
Frame.__init__(self, master)
master.protocol("WM_DELETE_WINDOW", self._delete_window)
self.statusStr = 'Not Connected'
self.updateTitle()
self.grid()
self.createWidgets()
def decode_normal_entry(entry_bytes):
stream = bitstring.BitStream(bytes=entry_bytes)
fat_file = FatFile()
fat_file.name = stream.read('bytes:11').decode().strip()
raw_attrs = stream.readlist(['2', '1', '1', '1', '1', '1', '1'])
raw_attrs.reverse()
fat_file.attrs = raw_attrs
reserved = stream.read('bytes:1')
fat_file.create_time = stream.read('uintle:24')
fat_file.create_date = stream.read('uintle:16')
fat_file.last_access_date = stream.read('uintle:16')
zeros = stream.read('bytes:2')
fat_file.last_modified_time = stream.read('uintle:16')
fat_file.last_modified_date = stream.read('uintle:16')
fat_file.first_cluster = stream.read('uintle:16')
fat_file.file_size = stream.read('uintle:32')
return fat_file
def to_bytes(self):
"""Encode packet to utf-8 byte sequence."""
bs = bitstring.BitArray(length=384)
bs[0:2] = bitstring.pack('uint: 2', self.__li)
bs[2:5] = bitstring.pack('uint: 3', self.__vn)
bs[5:8] = bitstring.pack('uint: 3', self.__mode)
bs[8:16] = bitstring.pack('uint: 8', self.__stratum)
bs[16:24] = bitstring.pack('uint: 8', self.__poll)
bs[24:32] = bitstring.pack('int: 8', self.__precision)
bs[32:64] = bitstring.pack('int: 32', self.__root_delay)
bs[64:96] = bitstring.pack('int: 32', self.__root_dispersion)
bs[96:128] = bitstring.BitStream(self.__reference_id)
bs[128:192] = bitstring.pack('uint: 64', self.__reference_timestamp)
bs[192:256] = bitstring.pack('uint: 64', self.__originate_timestamp)
bs[256:320] = bitstring.pack('uint: 64', self.__receive_timestamp)
bs[320:384] = bitstring.pack('uint: 64', self.__transmit_timestamp)
return bs.tobytes()
def from_hex(self, data):
reversed_bytes = bitstring.BitArray(bytearray(reversed(data)))
reversed_bits = bitstring.BitStream(reversed(reversed_bytes))
for phase in ['I', 'II', 'III']:
intensidad_dA = bitstring.BitArray(reversed(reversed_bits.read(24))).uint # in dA
tension_dV = bitstring.BitArray(reversed(reversed_bits.read(30))).uint # in dV
bitstring.BitArray(reversed(reversed_bits.read(1))) # not used
invalid = bitstring.BitArray(reversed(reversed_bits.read(1))).bool # valid 0/invalid 1
ipiv = InstantPhaseVI(phase, intensidad_dA / 10.0, tension_dV / 10.0, not invalid)
self.valores.append(ipiv)
dt = TimeA()
dt.from_hex(data[21:26])
self.valores.append(dt)
return self.valores
def from_hex(self, data):
reversed_bytes = bitstring.BitArray(bytes(reversed(data)))
reversed_bits = bitstring.BitStream(reversed(reversed_bytes))
self.minute = bitstring.BitArray(reversed(reversed_bits.read(6))).uint
self.TIS = reversed_bits.read(1).uint
self.IV = reversed_bits.read(1).uint
self.hour = bitstring.BitArray(reversed(reversed_bits.read(5))).uint
self.RES1 = bitstring.BitArray(reversed(reversed_bits.read(2))).uint
self.SU = reversed_bits.read(1).uint
self.dayofmonth = bitstring.BitArray(reversed(reversed_bits.read(5)))\
.uint
self.dayofweek = bitstring.BitArray(reversed(reversed_bits.read(3)))\
.uint
self.month = bitstring.BitArray(reversed(reversed_bits.read(4))).uint
self.ETI = bitstring.BitArray(reversed(reversed_bits.read(2))).uint
self.PTI = bitstring.BitArray(reversed(reversed_bits.read(2))).uint
self.year = bitstring.BitArray(reversed(reversed_bits.read(7))).uint
self.RES2 = reversed_bits.read(1).uint
def pack9_to_ascii(x):
"""
8 bit byte ascii string to 9 bit byte ascii string
"""
bits = ""
# pad to
for char in x:
bits += bin(ord(char))[2:].rjust(9, "0")
pad = len(bits) % 8
if pad:
bits += "0" * (8 - pad)
bits = "0b" + bits
bstream = bitstring.BitStream(bits)
return bstream.read(len(bstream)).hex.decode("hex")
def unpack_blob_to_json(self, blob:bytes) -> str:
"""
unpacks the BSM_Blob received from VISSIM and returns the JSON string filled with received values
"""
# Unpack the blob:
blob = bitstring.BitStream(blob).unpack(self.blobStructure)
# Validate the vehicle type and convert it into a string:
if blob[10] in VEH_TYPE_DICT.keys():
vehicle_Type = VEH_TYPE_DICT[blob[10]]
else: vehicle_Type = VEH_TYPE_DICT[0]
# Formulate JSON object containing BSM information:
bsmJson = {
"MsgType": "BSM",
"Timestamp_posix": time.time(),
"Timestamp_verbose": str(datetime.datetime.now()),
"BasicVehicle":
{
"msgCount" : blob[0],
"temporaryID": blob[1],
"secMark_Second": blob[2],
"speed_MeterPerSecond": (blob[6] / MULTIPLIER_SPEED),
"heading_Degree": (blob[7] / MULTIPLIER_HEADING),
"type": vehicle_Type,
"position":
{
"latitude_DecimalDegree": (blob[3] / MULTIPLIER_LATITUDE),
"longitude_DecimalDegree": (blob[4] / MULTIPLIER_LONGITUDE),
"elevation_Meter": (blob[5] / MULTIPLIER_ELEVATION)
},
"size":
{
"length_cm": (blob[8] / MULTIPLIER_LENGTH),
"width_cm": (blob[9] / MULTIPLIER_WIDTH)
}
}
}
# Convert the JSON object into a JSON string:
bsmJson = json.dumps(bsmJson)
# Return the JSON string:
return bsmJson
def test242pixels():
brightness = 1
period = 22.0
pixels = bitstring.BitStream()
for i in range(242):
red = int(127 + 127 * math.cos(2 * math.pi * (i / period)))
green = int(127 + 127 * math.cos(2 * math.pi *
((i + period / 3) / period)))
blue = int(127 + 127 * math.cos(2 * math.pi *
((i + 2 * period / 3) / period)))
pixels += led_frame(red, green, blue, brightness)
while (True):
data = start_frame
data += pixels
data += end_frame
#print(data)
gf.vendor_request_out(vendor_requests.SPI_WRITE, data=data.bytes)
time.sleep(0.1)
pixels.ror(32)
def init( self, obj ):
''' Initialize a field value based on its ftype. '''
ftype = self.TypeCode
attr = self.Name
if 'intbe' in ftype or ftype.startswith('bits'):
setattr( obj, attr, self.Default if self.Default else 0 )
elif ftype == 'bool':
setattr( obj, attr, False )
elif ftype == 'string':
setattr( obj, attr, u'' )
elif ftype.startswith('array'):
setattr( obj, attr, [] )
elif ftype == 'bitarray':
setattr( obj, attr, bytes() )
elif ftype == 'bytesToEnd':
assert False
setattr( obj, attr, bitstring.BitStream() )
else:
assert ftype.startswith('skip'), 'Unknown field type: "{}"'.format(ftype)
def pack(self, data):
'''Transform a structured format into a binary representation.'''
bits = bitstring.BitStream()
if hasattr(data, '__pack__'):
data.__pack__()
for f in self._fieldlist:
logging.debug('packing field %s as "%s"' % (f.name, f.spec))
try:
bits.append(f.pack(data[f.name]))
except KeyError:
try:
bits.append(f.pack(f.default))
except AttributeError:
raise KeyError(f.name)
return bits
def get_reply(self):
"""Waits for and returns Reply.
Returns:
First complete reply if expected message ID was not specified,
otherwise first complete reply of expected message ID.
Raises:
PacketCorrupted: Packet is corrupt.
"""
try:
#self.open() ################################ IN CASE GUI CLOSED PORT
# Wait for the '@' character.
while not self.conn.read() == "@":
pass
# Read one line at a time until packet is complete and parsed.
packet = bitstring.BitStream("0x40")
while True:
# Read until new line.
current_line = self.conn.readline()
for char in current_line:
packet.append("0x{:02X}".format(ord(char)))
# Try to parse.
try:
reply = Reply(packet)
break
except PacketIncomplete:
# Keep looking.
continue
rospy.logdebug("Received %s: %s", reply.name, reply.payload)
return reply
except select.error as (code, msg):
# Set SIGINT as KeyboardInterrupt correctly, because pyserial has
# problems.
if code == errno.EINTR:
raise KeyboardInterrupt()
# Otherwise, reraise.
raise
def byteVectToBitStream(self, byteVect, bitLen):
""" Take a byte array, byteVect, where bit 0 of the first byte, byte
0, is the lsb, or "first" bit. Create a BitStream() where the lsb is
the first, or left-most bit with index 0 for easy handling as a
BitStream(). Truncate the BitSTream so that it is bitLen long. """
# bit vectors are sent by shift: command with bit 0 of byte 0
# the first bit. Pad bits are therefore in the msbs of the
# last byte. Therefore, create BitStream() first, then byte
# swap before truncating.
# Use BitStream() constructor directly for creating TMS
# and TDI BitStreams. Assuming that it is more efficient
# than previous method with bitstring.pack().
#
# Actually measured the time difference between
# byteVectToBitStreamOLD() and byteVectToBitStream() and found
# byteVectToBitStreamOLD() to take on average 6ms while
# byteVectToBitStream() took only 4ms. When processing two
# byte vectors in shift: command, this is a total savings of 4 ms
bs = bitstring.BitStream(bytes=byteVect, length=len(byteVect) *
8) # length is a bit length
# Fix LSB first
#
# [@@@ Save time by dealing with bits in original order? Probably not since putting into the natural order of a BitStream()]
#@@@#for bn in range(0,len(byteVect)):
#@@@# bs.reverse(start=bn*8,end=(bn*8)+8)
#@@@#b3 = bitstring.BitStream('')
#@@@#for bn in range(0,len(byteVect)):
#@@@# a = bs[bn*8:(bn+1)*8]
#@@@# a.reverse()
#@@@# b3 += a
#@@@#return b3[0:bitLen]
## Using built-in commands are way faster than looping in
## Python. Like 100x faster in some case with large vectors.
bs.byteswap()
bs.reverse()
# Return truncated BitStream
return bs[0:bitLen]
def encode(self, msgid='', channel="B"):
msg = bitstring.BitStream()
for field in self.fields:
name = field[0]
type = field[1]
value = getattr(self, name)
if hasattr(self, type + "_convert"):
value = getattr(self, type + "_convert")(value, *field[2:])
else:
args = {}
args[type] = value
args["length"] = field[2]
value = bitstring.Bits(**args)
msg.append(value)
pad, payload = payload_armour(msg)
return encode_avidm(payload, pad, 1, 1, msgid, channel)
def deserialize(self, packed):
header = bitstring.BitStream(packed[0:UP_HEADER_SIZE])
try:
self.up_id, type_value, self.data = header.unpack('uint:8, uint:8, uint:8')
self.type = eTypeUp(type_value)
except ValueError as e:
raise DeserializationException("Can't deserialize up message header : {}".format(str(e)))
if self.type == eTypeUp.ACK_DOWN:
self.data = sAckDown()
elif self.type == eTypeUp.HMI_STATE:
self.data = sHMIState()
elif self.type == eTypeUp.ODOM_REPORT:
self.data = sOdomReport()
elif self.type == eTypeUp.SENSOR_VALUE:
self.data = sSensorValue()
try:
self.data.deserialize(packed[UP_HEADER_SIZE:])
except ValueError as e:
raise DeserializationException("Can't deserialize up message payload : {}".format(str(e)))
def MessageFactory(src):
if isinstance(src, bitstring.ConstBitArray):
bits = src
elif hasattr(src, 'read'):
bits = bitstring.BitStream(src)
else:
raise InvalidMessage()
mark = bits.pos
try:
msg = packedmessage.MessageParser.unpack(bits)
logging.debug('this is an FTS-0001 (C) message.')
except ValueError:
logging.debug('not a packed message; assuming this '
'is an FTS-0001 (B) message.')
bits.pos = mark
msg = diskmessage.MessageParser.unpack(bits)
return msg
def decode(cls, address, data):
[opcode] = struct.unpack('!H', data[8:10])
if(opcode not in cls.opcode_map):
raise NotImplementedError('%x' % opcode)
klass = cls.opcode_map[opcode]
b = bitstring.BitStream(bytes=data)
fields = dict()
for name, fmt in klass.schema:
accessor = getattr(klass, 'parse_%s' % name, None)
if(callable(accessor)):
fields[name] = accessor(b, fmt)
else:
fields[name] = b.read(fmt)
p = klass(address=address)
for k,v in fields.items():
setattr(p, k, v)
return p
def read_packet(stream):
global version_sum
version, id = read_header(stream)
version_sum += version
packets = []
if id == 4:
# literal
packets.append(read_literal(stream))
else:
# operator
length_type_id = stream.read('uint:1')
packets = []
if length_type_id:
count = stream.read('uint:11')
packets = [read_packet(stream) for i in range(count)]
else:
length = stream.read('uint:15')
sub_stream = bitstring.BitStream(bin=stream.read('bin:{}'.format(length)))
while sub_stream.pos + 8 < sub_stream.len:
packets.append(read_packet(sub_stream))
return operators[id](packets)
def parse_dci_1_1(dci_hex_bytes):
dci = pd.Series()
bit_stream = bitstring.BitStream(dci_hex_bytes)
dci['dl_fmt'] = bit_stream.read('uint:1')
dci['dl_bwpid'] = bit_stream.read('uint:1')
#dci['rballoc_type'] = bit_stream.read('uint:1')
#dci['riv'] = bit_stream.read('uint:16')
dci['dl_startPrb'], dci['dl_Prbnum'] = riv2startandlen(bit_stream.read('uint:16'))
dci['dl_timealloc'] = bit_stream.read('uint:3')
dci['dl_mcs'] = bit_stream.read('uint:5')
dci['dl_ndi'] = bit_stream.read('uint:1')
dci['dl_rv'] = bit_stream.read('uint:2')
dci['dl_harqid'] = bit_stream.read('uint:4')
dci['dl_dai'] = bit_stream.read('uint:2')
dci['dl_tpc'] = bit_stream.read('uint:2')
dci['dl_pucch_res'] = bit_stream.read('uint:3')
dci['dl_K1'] = bit_stream.read('uint:3')
dci['dl_antenna_port'] = bit_stream.read('uint:4')
dci['dl_srs'] = bit_stream.read('uint:2')
dci['dl_dmrs'] = bit_stream.read('uint:1')
return dci
def _on_message(self, ws, message):
"""
receive message(binary) from MTA
dispatch only payload(utf-8 str) included in message to CallBack Function
message format :
aplication Identifier length (1byte)
deviceIdentifier length (1byte)
payload length (4byte)
aplication Identifier
deviceIdentifier
payload
"""
self.info("mtaDevice._on_message(%s)" % message)
if self._dispatchFunction is not None:
byteMessage = bitstring.BitStream(bytes=message,
length=len(message) * 8)
startIndex = 0
aplIdByteLength = byteMessage[startIndex:startIndex + 8].int
startIndex += 8
devIdByteLength = byteMessage[startIndex:startIndex + 8].int
startIndex += 8
payloadByteLength = byteMessage[startIndex:startIndex + 32].int
startIndex += 32
aplIdBitLength = aplIdByteLength * 8
devIdBitLength = devIdByteLength * 8
payloadBitLength = payloadByteLength * 8
aplId = byteMessage[startIndex:startIndex + aplIdBitLength].bytes
startIndex += aplIdBitLength
devId = byteMessage[startIndex:startIndex + devIdBitLength].bytes
startIndex += devIdBitLength
payload = byteMessage[startIndex:startIndex +
payloadBitLength].bytes
self._dispatchFunction(payload)
pass
def from_hex(self, data):
reversed_bytes = bitstring.BitArray(bytearray(reversed(data)))
reversed_bits = bitstring.BitStream(reversed(reversed_bytes))
for name in ['Total', 'Phase I', 'Phase II', 'Phase III']:
potencia_activa = bitstring.BitArray(reversed(reversed_bits.read(24))).uint # kW
potencia_reactiva = bitstring.BitArray(reversed(reversed_bits.read(24))).uint # kVAr
factor_potencia = bitstring.BitArray(reversed(reversed_bits.read(10))).uint # cos phi in millis
is_exporting_activa = bitstring.BitArray(reversed(reversed_bits.read(1))).bool # 0 importada/ 1 exportada
is_exporting_reactiva = bitstring.BitArray(reversed(reversed_bits.read(1))).bool # 0 Q1/Q4 / 1 Q2/Q3
bitstring.BitArray(reversed(reversed_bits.read(3))) # not used
invalid = bitstring.BitArray(reversed(reversed_bits.read(1))).bool # 0 valid/ 1 invalid
ip = InstantPower(
name, potencia_activa, potencia_reactiva, factor_potencia / 1000.0,
is_exporting_activa, is_exporting_reactiva, not invalid
)
self.valores.append(ip)
dt = TimeA()
dt.from_hex(data[32:37])
self.valores.append(dt) # Localized datetime
return self.valores
def fromBytearray(self, frame=None):
''' Create HCV frame from a bytearray frame. '''
if not frame:
frame = self._frame
fmt = self._format
streamData = bitstring.BitStream(self._frame)
# List of format strings
fmtStr = fmt.split(',')
# Get all keywords from bitstring formatString
keys = [
kw.split('=')[1].strip() for kw in fmtStr if len(kw.split('=')) > 1
]
# Create dictionary from keys and stream data
frameDict = dict(zip(keys, streamData.unpack(fmt)))
# Assign items to self
self.update(frameDict)
return frameDict
def send_data(self, TMS_stream, TDI_stream):
TDO_stream = BitStream()
index = 0
n = len(TDI_stream)
while (index < n):
if ((self.get_state() == self.SHIFT_DR
or self.get_state() == self.SHIFT_IR)
and TMS_stream[index] == False):
end = TMS_stream.find(BitStream('0b1'), index)
if (end):
end = end[0]
else:
end = len(TMS_stream)
if (self.get_state() == self.SHIFT_IR):
self.ir = TDI_stream[index:end + 1]
self.ir.reverse()
if (self.verbosity_level >= 2):
print('New IR: {}'.format(self.ir.bin))
if (self.ir == bitstring.BitStream('0b000101')):
TDO_stream += self.jtag_data(TDI_stream[index:end], False)
else:
TDO_stream += self.jtag_data(TDI_stream[index:end], True)
index = end
else:
TDO_stream += self.jtag_general(TMS_stream[index:index + 1],
TDI_stream[index:index + 1])
index += 1
return TDO_stream
def from_hex(self, data):
reversed_bytes = bitstring.BitArray(bytearray(reversed(data)))
reversed_bits = bitstring.BitStream(reversed(reversed_bytes))
milliseconds = bitstring.BitArray(reversed(reversed_bits.read(10))).uint
self.microseconds = milliseconds * 1000
self.seconds = bitstring.BitArray(reversed(reversed_bits.read(6))).uint
self.minute = bitstring.BitArray(reversed(reversed_bits.read(6))).uint
self.TIS = reversed_bits.read(1).uint
self.IV = reversed_bits.read(1).uint
self.hour = bitstring.BitArray(reversed(reversed_bits.read(5))).uint
self.RES1 = bitstring.BitArray(reversed(reversed_bits.read(2))).uint
self.SU = reversed_bits.read(1).uint
self.dayofmonth = bitstring.BitArray(
reversed(reversed_bits.read(5))
).uint or 1
self.dayofweek = bitstring.BitArray(reversed(reversed_bits.read(3))).uint
self.month = bitstring.BitArray(
reversed(reversed_bits.read(4))
).uint or 1
self.ETI = bitstring.BitArray(reversed(reversed_bits.read(2))).uint
self.PTI = bitstring.BitArray(reversed(reversed_bits.read(2))).uint
self.year = bitstring.BitArray(reversed(reversed_bits.read(7))).uint
self.RES2 = reversed_bits.read(1).uint
def sendMessage(self, message):
"""
send message(utf-8 str) to MTA
"""
self.info("mtaDevice.sendMessage(%s" %
message[:40 if len(message) > 45 else len(message)] +
'...)' if len(message) > 45 else ')')
self._dstApl = "RENV"
aplIdLength = bitstring.BitStream(int=len(self._dstApl), length=8)
devIdLength = bitstring.BitStream(int=len(self._deviceName), length=8)
payloadLength = bitstring.BitStream(int=len(message), length=32)
aplId = bitstring.BitStream(bytes=self._dstApl,
length=len(self._dstApl) * 8)
devId = bitstring.BitStream(bytes=self._deviceName,
length=len(self._deviceName) * 8)
payload = bitstring.BitStream(bytes=message, length=len(message) * 8)
sendData = aplIdLength + devIdLength + payloadLength + aplId + devId + payload
self._ws.send(sendData.bytes, websocket.ABNF.OPCODE_BINARY)
pass
else: a_eta_hour = 24
if eta == "current": a_eta_minute = timestamp.minute
else: a_eta_minute = 60
a_draught = locale.atoi(splitvdm[11]) * 10 # * 0.1 m
a_destination = splitvdm[1]
if (a_destination == ''): a_destination = splitvdm[12]
if (a_destination == ''): a_destination = 'FG DEMO'
a_destination = (a_destination + ' ')[0:20]
a_dte = 1
a_spare = 0
vdmmap['type'] = bitstring.BitStream(uint=a_type, length=6)
vdmmap['repeat'] = bitstring.BitStream(uint=a_repeat, length=2)
vdmmap['mmsi'] = bitstring.BitStream(uint=a_mmsi, length=30)
vdmmap['versn'] = bitstring.BitStream(uint=a_versn, length=2)
vdmmap['imo'] = bitstring.BitStream(uint=a_imo, length=30)
vdmmap['callsign'] = bitstring.pack(
'bin:42', intvec2bitstring(aisdecode(a_callsign))) # length=42
vdmmap['name'] = bitstring.pack('bin:120',
intvec2bitstring(
aisdecode(a_name))) # length=120
vdmmap['shiptype'] = bitstring.BitStream(uint=a_shiptype, length=8)
vdmmap['to_bow'] = bitstring.BitStream(uint=a_to_bow, length=9)
vdmmap['to_stern'] = bitstring.BitStream(uint=a_to_stern, length=9)
vdmmap['to_port'] = bitstring.BitStream(uint=a_to_port, length=6)
vdmmap['to_stbd'] = bitstring.BitStream(uint=a_to_stbd, length=6)
vdmmap['fixtype'] = bitstring.BitStream(uint=a_fixtype, length=4)
def pack(self, val):
bits = bitstring.BitStream()
for data in val:
bits.append(self.field.pack(data))
return bits