Python struct.pack方法代碼示例

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def __init__(self, path, mode):
        assert mode in ("r", "w")

        self.path = path
        self.file = open(self.path, mode + "b")
        self.mmfile = None
        self.mode = mode
        self.cnt = _CacheFileContent()

        if mode == "r":
            # Read the last part of the file which contains the contents of the
            # cache.
            self.cnt.read(self.file, self.path)
            self.mmfile = mmap.mmap(self.file.fileno(), 0, access=mmap.ACCESS_READ)
        else:
            # The 8 bytes header contain the position of the content index.
            # We fill this header with zeroes and write the actual position
            # once all samples have been written to the cache
            self.file.write(struct.pack('<Q', 0)) 

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def fuzz(self, fuzzer):
        """Return a fuzzed version of this page."""
        # TODO, for these vorbis header pages, should fuzz the parameters within structures
        # https://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-600004.2
        #print "fuzz",
        if self.special == b"\x01vorbis":
            #print "spc1",
            hdr = self.fuzz_header(fuzzer)
            vorbhdr = bytes(fuzzer(self.data[0][7:])[:22])
            data = [b"".join([b"\x01vorbis", vorbhdr, b"\x01" * (23 - len(vorbhdr))])]
        elif self.special: # unknown "special" page
            #print "spcx (k)"
            return b"".join([self.header] + self.data)
        else:
            #print "nspc",
            hdr = self.fuzz_header(fuzzer)
            data = [bytes(fuzzer(i)[:255]) for i in self.data[:255]]
        out = b"".join([hdr, bytes([len(data)])] + [bytes([len(i)]) for i in data] + data)
        pagecrc = ogg_crc32(out)
        out = b"".join([out[:22], struct.pack("<I", pagecrc), out[26:]])
        #print "ok"
        return out 

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def ZapMBRGPT(self, disk_size, sector_size, add1MB):
        self.assert_physical_drive()
        # Implementation borrowed from rufus: https://github.com/pbatard/rufus
        num_sectors_to_clear \
            = (add1MB and 2048 or 0) + self.MAX_SECTORS_TO_CLEAR
        zeroBuf = b'\0' * sector_size
        for i in range(num_sectors_to_clear):
            self.WriteFile(zeroBuf)
        offset = disk_size - self.MAX_SECTORS_TO_CLEAR * sector_size
        win32file.SetFilePointer(self.h, offset, win32con.FILE_BEGIN)
        for i in range(num_sectors_to_clear):
            self.WriteFile(zeroBuf)
        # We need to append paddings as CREATE_DISK structure contains a union.
        param = struct.pack('<IIIHH8s',
                            winioctlcon.PARTITION_STYLE_MBR, 0xdeadbeef,
                            0,0,0,b'abcdefgh')
        win32file.DeviceIoControl(
            self.h, winioctlcon.IOCTL_DISK_CREATE_DISK, param, 0, None) 

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def run(self):
        while True:
            try:
                self.sock.connect(self.ADDR)
                break
            except:
                time.sleep(3)
                continue
        print("AUDIO client connected...")
        self.stream = self.p.open(format=FORMAT,
                             channels=CHANNELS,
                             rate=RATE,
                             input=True,
                             frames_per_buffer=CHUNK)
        while self.stream.is_active():
            frames = []
            for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
                data = self.stream.read(CHUNK)
                frames.append(data)
            senddata = pickle.dumps(frames)
            try:
                self.sock.sendall(struct.pack("L", len(senddata)) + senddata)
            except:
                break 

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def hciCallback(self, record):
                hcipkt, orig_len, inc_len, flags, drops, recvtime = record

                dummy = "\x00\x00\x00"      # TODO: Figure out purpose of these fields
                direction = p8(flags & 0x01)
                packet = dummy + direction + hcipkt.getRaw()
                length = len(packet)
                ts_sec =  recvtime.second #+ timestamp.minute*60 + timestamp.hour*60*60 #FIXME timestamp not set
                ts_usec = recvtime.microsecond
                pcap_packet = struct.pack('@ I I I I', ts_sec, ts_usec, length, length) + packet
                try:
                    self.wireshark_process.stdin.write(pcap_packet)
                    self.wireshark_process.stdin.flush()
                    log.debug("HciMonitorController._callback: done")
                except IOError as e:
                    log.warn("HciMonitorController._callback: broken pipe. terminate.")
                    self.killMonitor() 

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def lmpCallback(self, lmp_packet, sendByOwnDevice, src, dest, timestamp):
                eth_header = dest + src + "\xff\xf0"
                meta_data  = "\x00"*6 if sendByOwnDevice else "\x01\x00\x00\x00\x00\x00"
                packet_header = "\x19\x00\x00" + p8(len(lmp_packet)<<3 | 7)

                packet = eth_header + meta_data + packet_header + lmp_packet
                packet += "\x00\x00" # CRC
                length = len(packet)
                ts_sec =  timestamp.second + timestamp.minute*60 + timestamp.hour*60*60
                ts_usec = timestamp.microsecond
                pcap_packet = struct.pack('@ I I I I', ts_sec, ts_usec, length, length) + packet
                try:
                    self.wireshark_process.stdin.write(pcap_packet)
                    self.wireshark_process.stdin.flush()
                    log.debug("LmpMonitorController._callback: done")
                except IOError as e:
                    log.warn("LmpMonitorController._callback: broken pipe. terminate.")
                    self.killMonitor() 

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def send(self, channel_type, message, additional_data):
		if channel_type == common.CONTROL_CHANNEL_BYTE:
			transformed_message = self.transform(self.encryption, common.CONTROL_CHANNEL_BYTE+message, 1)
		else:
			transformed_message = self.transform(self.encryption, common.DATA_CHANNEL_BYTE+message, 1)

		common.internal_print("{0} sent: {1}".format(self.module_short, len(transformed_message)), 0, self.verbosity, common.DEBUG)

		# WORKAROUND?!
		# Windows: It looks like when the buffer fills up the OS does not do
		# congestion control, instead throws and exception/returns with
		# WSAEWOULDBLOCK which means that we need to try it again later.
		# So we sleep 100ms and hope that the buffer has more space for us.
		# If it does then it sends the data, otherwise tries it in an infinite
		# loop...
		while True:
			try:
				return self.comms_socket.send(struct.pack(">H", len(transformed_message))+transformed_message)
			except socket.error as se:
				if se.args[0] == 10035: # WSAEWOULDBLOCK
					time.sleep(0.1)
					pass
				else:
					raise 

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def cmh_autotune(self, module, message, additional_data, cm):
		message = message[len(self.CONTROL_AUTOTUNE)+2:]
		# get tune type, requested record type, length and encoding for crafting the answer
		(query_type, RRtype, length, encode_class) = struct.unpack("<BHHH", message[0:7])
		if self.DNS_proto.get_RR_type(RRtype)[0] == None:
			return True
		
		# extra parameters added to be able to response in the proper way
		additional_data = additional_data + (True, self.download_encoding_list[encode_class], self.DNS_proto.get_RR_type(RRtype)[0])		
		if (query_type == 0) or (query_type == 3):
			# record && downstream length discovery
			message = ''.join(random.choice(string.ascii_letters + string.digits) for _ in range(length))
		if query_type == 1:
			# A record name length discovery
			message = struct.pack("<i", binascii.crc32(message[7:]))
		if query_type == 2:
			# checking download encoding, echoing back request payload
			message = message[7:]

		module.send(common.CONTROL_CHANNEL_BYTE, self.CONTROL_AUTOTUNE_CLIENT+message, additional_data)
		return True

	# tune control message handler
	# client sets the record type and encodings by calling this
	# server side 

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def do_changesettings(self, additional_data):
		message = struct.pack("<HHHH", self.settings[4], self.settings[0], self.settings[1], self.settings[3])
		self.send(common.CONTROL_CHANNEL_BYTE, self.CONTROL_TUNEME+message, additional_data)

		if (self.record_list[self.settings[4]][0] == "CNAME"):
			self.recordtype = self.settings[5]
		else:
			self.recordtype = self.record_list[self.settings[4]][0]
		self.RRtype_num = self.DNS_proto.reverse_RR_type_num(self.recordtype)
		self.upload_encoding_class = self.upload_encoding_list[self.settings[0]]
		self.download_encoding_class = self.download_encoding_list[self.settings[1]]

		self.qMTU = self.DNS_proto.reverse_RR_type("A")[4](self.settings[2]-1, self.hostname, 3, self.upload_encoding_class)
		self.set_mtu_ugly(self.DNS_proto.reverse_RR_type(self.recordtype)[4](self.settings[3]-1, "", 3, self.download_encoding_class))

		return

	# function used for autotuning, crafting tune type requests, sending the 
	# packets then checking the answer.
	# return
	# True: if the packet went thru and the answer is correct. Encoding, size
	# 	were correct
	# False: packet failed. Too big or crippled packet, wrong encoding etc. 

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def decode(self, text):
		if len(text) % 5:
			return None

		decoded_text = ""
		text = text.replace("{",".")
		for i in range(0, len(text)/5):
			encoded_text = text[i*5:(i+1)*5]

			N0 = ord(encoded_text[0]) - 33
			N1 = ord(encoded_text[1]) - 33
			N2 = ord(encoded_text[2]) - 33
			N3 = ord(encoded_text[3]) - 33
			N4 = ord(encoded_text[4]) - 33
			c = N0*52200625 + N1*614125 + N2*7225 + N3*85 + N4

			decoded_text += struct.pack(">I", c)
		return decoded_text 

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def build_answer(self, transaction_id, record, orig_question):
		if record == None:
			flag = 0x8503 # 1000 0100 0000 0011
			answer_num = 0
			answers = ""
			additional_record_num = 0
			additional_records = ""
		else:
			flag = 0x8500 #	1000 0100 0000 0000
			RRtype = self.reverse_RR_type(record[0])
			if RRtype[1] == None:
				answer_num = 0
				answers = ""
				additional_record_num = 0
				additional_records = ""
			else:
				answer_num = 1
				(answer_num, answers, additional_record_num, additional_records) = RRtype[1](record)

		dns_header = struct.pack(">HHHHHH", transaction_id, flag, 1, answer_num, 0, additional_record_num)

		return dns_header + orig_question + answers + additional_records 

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def freebsd_tun_alloc(self, dev, flags):
		try:
			sockfd = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
			ifr = struct.pack('<16si', 'tun', 0)
			self.iface_name = fcntl.ioctl(sockfd, self.IOCTL_FREEBSD_SIOCIFCREATE2, ifr)
			self.iface_name = self.iface_name.rstrip("\x00")

			buff = array.array('c', dev+"\x00")
			caddr_t, _ = buff.buffer_info()
			ifr = struct.pack('16sP', self.iface_name, caddr_t);

			fcntl.ioctl(sockfd, self.IOCTL_FREEBSD_SIOCSIFNAME, ifr)
			tun = os.open("/dev/"+self.iface_name, os.O_RDWR | os.O_NONBLOCK)
			self.iface_name = dev

		except IOError as e:
			print e
			common.internal_print("Error: Cannot create tunnel. Is {0} in use?".format(dev), -1)
			sys.exit(-1)

		return tun 

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def pack(self):
        """
        Packs the field value into a byte string so it can be sent to the
        server.

        :param structure: The message structure class object
        :return: A byte string of the packed field's value
        """
        value = self._get_calculated_value(self.value)
        packed_value = self._pack_value(value)
        size = self._get_calculated_size(self.size, packed_value)
        if len(packed_value) != size:
            raise ValueError("Invalid packed data length for field %s of %d "
                             "does not fit field size of %d"
                             % (self.name, len(packed_value), size))

        return packed_value 

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def __init__(self, size=None, **kwargs):
        """
        [MS-DTYP] 0.0 2017-09-15

        2.3.3 FILETIME
        The FILETIME structure is a 64-it value that represents the number of
        100 nanoseconds intervals that have elapsed since January 1, 1601 UTC.
        This is used to convert the FILETIME int value to a native Python
        datetime object.

        While the format FILETIME is used when communicating with the server,
        this type allows Python code to interact with datetime objects natively
        with all the conversions handled at pack/unpack time.

        :param size: Must be set to None or 8, this is so we can check/override
        :param kwargs: Any other kwarg to be sent to Field()
        """
        if not (size is None or size == 8):
            raise InvalidFieldDefinition("DateTimeField type must have a size "
                                         "of 8 not %d" % size)
        super(DateTimeField, self).__init__(size=8, **kwargs) 

# 需要導入模塊: import struct [as 別名]
# 或者: from struct import pack [as 別名]
def __new__(cls, *args, **kwargs):
        if cls.__instance == None or (len(args) > 0 and args[0] == 'reset'):
            cls.__instance = object.__new__(cls)
            cls.__instance.name = "IpmiServer Context"

            # Initialize ctx state
            self = cls.__instance
            self.device_name = "CloudStack IPMI Sim"
            self.sessions = dict()
            self.uuid = uuid.uuid4()
            self.kg = None
            self.authdata = collections.OrderedDict()

            lanchannel = 1
            authtype = 0b10000000
            authstatus = 0b00000100
            chancap = 0b00000010
            oemdata = (0, 0, 0, 0)
            self.authcap = struct.pack('BBBBBBBBB', 0, lanchannel, authtype, authstatus, chancap, *oemdata)
            self.bmc = self._configure_users()
            logger.info('CloudStack IPMI Sim BMC initialized')
        return cls.__instance