Python struct.error() Examples

def _GetMACFromData(data):
  """Unpacks and formats MAC address data.

  Args:
    data: buffer, usually an NSCFData object
  Returns:
    string containing the MAC address
  Raises:
    InterfaceError: if data can't be unpacked
  """
  try:
    unpacked = struct.unpack_from('BBBBBB', data)
  except struct.error as e:
    logging.error('Could not unpack MAC address data: %s', e)
    raise InterfaceError(e)
  return ':'.join(['{:02x}'.format(i) for i in unpacked]) 

def resolve_inline_message_id(inline_msg_id):
    """
    Resolves an inline message ID. Returns a tuple of
    ``(message id, peer, dc id, access hash)``

    The ``peer`` may either be a :tl:`PeerUser` referencing
    the user who sent the message via the bot in a private
    conversation or small group chat, or a :tl:`PeerChannel`
    if the message was sent in a channel.

    The ``access_hash`` does not have any use yet.
    """
    try:
        dc_id, message_id, pid, access_hash = \
            struct.unpack('<iiiq', _decode_telegram_base64(inline_msg_id))
        peer = types.PeerChannel(-pid) if pid < 0 else types.PeerUser(pid)
        return message_id, peer, dc_id, access_hash
    except (struct.error, TypeError):
        return None, None, None, None 

def __init__(self, s):
        # is this a valid font
        self.ok = False

        # parse functions for tables, and a flag for whether each has been
        # parsed successfully
        self.parseFuncs = {
            "head" : [self.parseHead, False],
            "name" : [self.parseName, False],
            "OS/2" : [self.parseOS2, False]
            }

        try:
            self.parse(s)
        except (struct.error, ParseError), e:
            self.error = e

            return 

def recvpacket(timeout = None):
    global connection
    if connection is None:
        connect()
    #connection.settimeout(timeout)
    #try:
    #    lengthdatum, addr = connection.recvfrom(2)
    #except socket.timeout:
    #    return None
    #connection.settimeout(None)
    #try:
    #    (length, ) = struct.unpack('<H', lengthdatum)
    #except struct.error:
    #    connect()
    #    return None
    #data, addr = connection.recvfrom(length - 2)
    try:
        data, addr = connection.recvfrom(1024)
    except socket.timeout:
        return None
    packet = packetcodec.decode_packet(data)
    if debug:
        print('recvpacket(): ', packet)
    return packet 

def readline(self):
        if self.eof:
            raise EOFError()

        if not self.first_byte and self.plusbytes != 0:
            self.first_byte = self.sb.read(self.plusbytes)
            if self.first_byte != b'\n':
                logger.debug('Discarding first partial row')
                self.sb._raw_stream.readline()
        try:
            retval = self.sb._raw_stream.readline()
        except struct.error:
            raise EOFError()
        self.pos += len(retval)

        if self.pos >= self.size:
            self.eof = True

        return retval 

def _syscmd_uname(option,default=''):

    """ Interface to the system's uname command.
    """
    if sys.platform in ('dos','win32','win16','os2'):
        # XXX Others too ?
        return default
    try:
        f = os.popen('uname %s 2> %s' % (option, DEV_NULL))
    except (AttributeError,os.error):
        return default
    output = f.read().strip()
    rc = f.close()
    if not output or rc:
        return default
    else:
        return output 

def ParseIndexes(self, block, dictionary):
        data = block.data
        pos = 32
        size = block.logical_size
        while pos < size:
            index = struct.unpack("<I", data[pos : pos+4])[0]
            pos += 4
            index_size, bytes_moved = SpotlightStore.ReadVarSizeNum(data[pos:])
            pos += bytes_moved
            
            padding = index_size % 4
            pos += padding

            index_size = 4*int(index_size//4)
            ids = struct.unpack("<" + str(index_size//4) + "i", data[pos:pos + index_size])
            pos += index_size
            
            # sanity check
            temp = dictionary.get(index, None)
            if temp != None:
                log.error("Error, category {} already exists!!".format(temp))
            # end check
            dictionary[index] = ids 

def saveProxyLog(name, config):
    '''
    Save proxy log database into a new file

    :param name: Name of file to save data into (should be .db)
    :param config: Proxy ConfigParser object from proxy.ini
    :return: None
    '''

    log = config.get("DATABASE", "filename")
    oldpath = os.path.join(faradayHelper.userPath, 'lib', log)
    newpath = os.path.join(faradayHelper.userPath, 'lib', name)

    try:
        shutil.move(oldpath, newpath)
        sys.exit(0)

    except shutil.Error as e:
        logger.error(e)
    except IOError as e:
        logger.error(e) 

def ParseIndexes(self, block, dictionary):
        data = block.data
        pos = 32
        size = block.logical_size
        while pos < size:
            index = struct.unpack("<I", data[pos : pos+4])[0]
            pos += 4
            index_size, bytes_moved = SpotlightStore.ReadVarSizeNum(data[pos:])
            pos += bytes_moved
            
            padding = index_size % 4
            pos += padding

            index_size = 4*int(index_size//4)
            ids = struct.unpack("<" + str(index_size//4) + "I", data[pos:pos + index_size])
            pos += index_size
            
            # sanity check
            temp = dictionary.get(index, None)
            if temp != None:
                log.error("Error, category {} already exists!!".format(temp))
            # end check
            dictionary[index] = ids 

def parse_column(self, packet, charset='utf-8'):
        """Parse a MySQL column-packet"""
        (packet, _) = utils.read_lc_string(packet[4:])  # catalog
        (packet, _) = utils.read_lc_string(packet)  # db
        (packet, _) = utils.read_lc_string(packet)  # table
        (packet, _) = utils.read_lc_string(packet)  # org_table
        (packet, name) = utils.read_lc_string(packet)  # name
        (packet, _) = utils.read_lc_string(packet)  # org_name

        try:
            (_, _, field_type,
             flags, _) = struct_unpack('<xHIBHBxx', packet)
        except struct.error:
            raise errors.InterfaceError("Failed parsing column information")

        return (
            name.decode(charset),
            field_type,
            None,  # display_size
            None,  # internal_size
            None,  # precision
            None,  # scale
            ~flags & FieldFlag.NOT_NULL,  # null_ok
            flags,  # MySQL specific
        ) 

def test_getdimensions(monkeypatch):
    if sys.version_info >= (3, 3):
        import shutil
        Size = namedtuple('Size', 'lines columns')
        monkeypatch.setattr(shutil, 'get_terminal_size', lambda: Size(60, 100))
        assert terminalwriter._getdimensions() == (60, 100)
    else:
        fcntl = py.test.importorskip("fcntl")
        import struct
        l = []
        monkeypatch.setattr(fcntl, 'ioctl', lambda *args: l.append(args))
        try:
            terminalwriter._getdimensions()
        except (TypeError, struct.error):
            pass
        assert len(l) == 1
        assert l[0][0] == 1 

def __ubx_NAV_POSLLH(self, dev):
        payload = dev.read(size=30)
        payload_cpy = payload

        if self.__validate_checksum(1, 2, payload, dev):
            try:
                payload_cpy = payload_cpy[2:]
                # Remove padding (=) introduced by struct for processor optimization
                self.iTOW, self.lon, self.lat, self.height, self.hMSL, self.hAcc, self.vAcc = struct.unpack('=LllllLL', payload_cpy)
                self.ubx_class = '01'
                self.ubx_id = '02'

            except struct.error:
                print("{} {}".format(sys.exc_info()[0], sys.exc_info()[1]))



    # time_of_week in ms / Dilution of Precision
    # DOP is Dimensionless / scaled by factor 100
    # Geometric / Position / Time / Vertical / Horizontal / Northing / Easting 

def __ubx_NAV_PVT(self, dev):
        payload = dev.read(size=94)
        payload_cpy = payload

        if(self.__validate_checksum(1, 7, payload, dev)):
            try:
                payload_cpy = payload[2:]
                self.iTOW, self.year, self.month, self.day, self.hour, self.minute, self.second, self.valid, self.tAcc, self.nano, self.fixType, self.flags, self.flags2, self.numSV, self.lon, self.lat, self.height, self.hMSL, self.hAcc, self.vAcc, self.velN, self.velE, self.velD, self.gSpeed, self.headMot, self.sAcc, self.headAcc, self.pDOP, reserved11, reserved12, reserved13, reserved14, reserved15, reserved16,  self.headVeh, self.magDec, self.magAcc = struct.unpack('=LH5BBLlB2BB4l2L5lLLH6BlhH', payload_cpy)

                self.ubx_class = '01'
                self.ubx_id = '07'
            except struct.error:
                print("{} {}".format(sys.exc_info()[0], sys.exc_info()[1]))


    ## UBX-ACK 0x05 ##

    # UBX-ACK-ACK (0x05 0x01) 

def parse_eof(self, packet):
        """Parse a MySQL EOF-packet"""
        if packet[4] == 0:
            # EOF packet deprecation
            return self.parse_ok(packet)

        err_msg = "Failed parsing EOF packet."
        res = {}
        try:
            unpacked = struct_unpack('<xxxBBHH', packet)
        except struct.error:
            raise errors.InterfaceError(err_msg)

        if not (unpacked[1] == 254 and len(packet) <= 9):
            raise errors.InterfaceError(err_msg)

        res['warning_count'] = unpacked[2]
        res['status_flag'] = unpacked[3]
        return res 

def unpack(self, buffer):
        """Unpack a header into a header object.

        Overwrites any existing header field values with new values
        obtained from the buffer.

        Returns:
            The header object.
        """
        try:
            values = self._structure.unpack(buffer)
        except struct.error as e:
                raise ValueError("Buffer of length {} too short"
                                 .format(len(buffer),
                                         str(e).capitalize())) from e
        else:
            return self._unpack(values) 

def v4_int_to_packed(address):
    """Represent an address as 4 packed bytes in network (big-endian) order.

    Args:
        address: An integer representation of an IPv4 IP address.

    Returns:
        The integer address packed as 4 bytes in network (big-endian) order.

    Raises:
        ValueError: If the integer is negative or too large to be an
          IPv4 IP address.

    """
    try:
        return _compat_to_bytes(address, 4, 'big')
    except (struct.error, OverflowError):
        raise ValueError("Address negative or too large for IPv4") 

def v4_int_to_packed(address):
    """Represent an address as 4 packed bytes in network (big-endian) order.

    Args:
        address: An integer representation of an IPv4 IP address.

    Returns:
        The integer address packed as 4 bytes in network (big-endian) order.

    Raises:
        ValueError: If the integer is negative or too large to be an
          IPv4 IP address.

    """
    try:
        return _compat_to_bytes(address, 4, 'big')
    except (struct.error, OverflowError):
        raise ValueError("Address negative or too large for IPv4") 

def _parse_hextet(cls, hextet_str):
        """Convert an IPv6 hextet string into an integer.

        Args:
            hextet_str: A string, the number to parse.

        Returns:
            The hextet as an integer.

        Raises:
            ValueError: if the input isn't strictly a hex number from
              [0..FFFF].

        """
        # Whitelist the characters, since int() allows a lot of bizarre stuff.
        if not cls._HEX_DIGITS.issuperset(hextet_str):
            raise ValueError("Only hex digits permitted in %r" % hextet_str)
        # We do the length check second, since the invalid character error
        # is likely to be more informative for the user
        if len(hextet_str) > 4:
            msg = "At most 4 characters permitted in %r"
            raise ValueError(msg % hextet_str)
        # Length check means we can skip checking the integer value
        return int(hextet_str, 16) 

def read_tag(self, *tags):
        """ read tag from a connected plc

        Possible combination can be passed to this method:
                - ('Counts') a single tag name
                - (['ControlWord']) a list with one tag or many
                - (['parts', 'ControlWord', 'Counts'])

        At the moment there is not a strong validation for the argument passed. The user should verify
        the correctness of the format passed.

        :return: None is returned in case of error otherwise the tag list is returned
        """

        if not self._forward_open():
            self.__log.warning("Target did not connected. read_tag will not be executed.")
            raise DataError("Target did not connected. read_tag will not be executed.")

        if len(tags) == 1:
            if isinstance(tags[0], (list, tuple, GeneratorType)):
                return self._read_tag_multi(tags[0])
            else:
                return self._read_tag_single(tags[0])
        else:
            return self._read_tag_multi(tags) 

def _parse_multiple_request_write(tags, reply):
        """ parse the message received from a multi request writ:

        For each tag parsed, the information extracted includes the tag name and the status of the writing.
        Those information are appended to the tag list as tuple

        :return: the tag list
        """
        offset = 50
        position = 50

        try:
            number_of_service_replies = unpack_uint(reply[offset:offset + 2])
            tag_list = []
            for index in range(number_of_service_replies):
                position += 2
                start = offset + unpack_uint(reply[position:position + 2])
                general_status = unpack_usint(reply[start + 2:start + 3])
                error = None if general_status == SUCCESS else get_service_status(general_status)
                tag_list.append(Tag(*tags[index], error))
            return tag_list
        except Exception as e:
            raise DataError(e) 

def __ubx_CFG_PRT(self, rate):
        header, ubx_class, ubx_id, length, uart_port = 46434, 6, 0, 20, 1

        rate = hex(rate)
        rate = rate[2:]
        while(len(rate) < 8):
            rate = '0' + rate

        rate1, rate2, rate3, rate4 = int(rate[-2:], 16), int(rate[-4:-2], 16), int(rate[2:4], 16), int(rate[:2], 16)

        payload = [length, 0, uart_port, 0, 0, 0, 208, 8, 0, 0, rate1, rate2, rate3, rate4, 7, 0, 3, 0, 0, 0, 0, 0]
        checksum = self.__calc_checksum(ubx_class, ubx_id, payload)
        payload = payload + checksum
        try:
            self.msg = struct.pack('>H26B', header, ubx_class, ubx_id, *payload)
            self.ubx_class = '06'
            self.ubx_id = '00'
        except struct.error:
            print("{} {}".format(sys.exc_info()[0], sys.exc_info()[1]))


    # UBX-CFG-MSG (0x06 0x01) 

def __ubx_ACK_ACK(self, dev):
        payload = dev.read(size=4)
        payload_cpy = payload

        if(self.__validate_checksum(5, 1, payload, dev)):
            try:
                payload_cpy = payload_cpy[2:]
                self.clsID, self.msgID = struct.unpack('=BB', payload_cpy)
                self.clsID, self.msgID = hex(self.clsID), hex(self.msgID)
                self.ubx_class = '05'
                self.ubx_id = '01'

            except struct.error:
                print("{} {}".format(sys.exc_info()[0], sys.exc_info()[1]))


    # UBX-ACK-NAK (0x05 0x00) 

def __ubx_NAV_DOP(self, dev):
        payload = dev.read(size=20)
        payload_cpy = payload

        if self.__validate_checksum(1, 4, payload, dev):
            try:
                payload_cpy = payload_cpy[2:]
                self.iTOW, self.gDOP, self.pDOP, self.tDOP, self.vDOP, self.hDOP, self.nDOP, self.eDOP = struct.unpack('=L7H', payload_cpy)
                self.ubx_class = '01'
                self.ubx_id = '04'

            except struct.error:
                print("{} {}".format(sys.exc_info()[0], sys.exc_info()[1]))


    # Time_of_week in ms / Fractional time_of_week ns / Week number
    # GPS Fix (6 valid types depending on status) / Fix status flags (4 types)
    # ECEF X cm / ECEF Y cm / ECEF Z cm / Position Accuracy cm
    # ECEF-Velocity X cm/s / ECEF-Velocity Y cm/s / ECEF-Velocity Z cm/s
    # Speed Accuracy cm/s / Position DOP (scale 0.01)
    # reserved / number of SV's used / reserved 

def _parse_octet(cls, octet_str):
        """Convert a decimal octet into an integer.

        Args:
            octet_str: A string, the number to parse.

        Returns:
            The octet as an integer.

        Raises:
            ValueError: if the octet isn't strictly a decimal from [0..255].

        """
        if not octet_str:
            raise ValueError("Empty octet not permitted")
        # Whitelist the characters, since int() allows a lot of bizarre stuff.
        if not cls._DECIMAL_DIGITS.issuperset(octet_str):
            msg = "Only decimal digits permitted in %r"
            raise ValueError(msg % octet_str)
        # We do the length check second, since the invalid character error
        # is likely to be more informative for the user
        if len(octet_str) > 3:
            msg = "At most 3 characters permitted in %r"
            raise ValueError(msg % octet_str)
        # Convert to integer (we know digits are legal)
        octet_int = int(octet_str, 10)
        # Any octets that look like they *might* be written in octal,
        # and which don't look exactly the same in both octal and
        # decimal are rejected as ambiguous
        if octet_int > 7 and octet_str[0] == '0':
            msg = "Ambiguous (octal/decimal) value in %r not permitted"
            raise ValueError(msg % octet_str)
        if octet_int > 255:
            raise ValueError("Octet %d (> 255) not permitted" % octet_int)
        return octet_int 

def _send(self, message):
        """
        socket send
        :return: true if no error otherwise false
        """
        try:
            if self.debug:
                self.__log.debug(print_bytes_msg(message, '>>> SEND >>>'))
            self._sock.send(message)
        except Exception as e:
            raise CommError(e) 

def dottedQuadToNum(ip):
    """
    Convert decimal dotted quad string to long integer
    
    >>> int(dottedQuadToNum('1 '))
    1
    >>> int(dottedQuadToNum(' 1.2'))
    16777218
    >>> int(dottedQuadToNum(' 1.2.3 '))
    16908291
    >>> int(dottedQuadToNum('1.2.3.4'))
    16909060
    >>> dottedQuadToNum('1.2.3. 4')
    16909060
    >>> dottedQuadToNum('255.255.255.255')
    4294967295L
    >>> dottedQuadToNum('255.255.255.256')
    Traceback (most recent call last):
    ValueError: Not a good dotted-quad IP: 255.255.255.256
    """
    
    # import here to avoid it when ip_addr values are not used
    import socket, struct
    
    try:
        return struct.unpack('!L',
            socket.inet_aton(ip.strip()))[0]
    except socket.error:
        # bug in inet_aton, corrected in Python 2.3
        if ip.strip() == '255.255.255.255':
            return 0xFFFFFFFFL
        else:
            raise ValueError('Not a good dotted-quad IP: %s' % ip)
    return 

def closeConnection(conn, addr, faraday):
    # close the connection
    logger.info("Closing connection with {0} on {1}".format(addr[0], faraday))
    time.sleep(0.01)  # Need to give time for any TX to finish
    try:
        conn.close()
    except IOError as e:
        logger.error(e) 

def _compat_to_bytes(intval, length, endianess):
    assert isinstance(intval, _compat_int_types)
    assert endianess == 'big'
    if length == 4:
        if intval < 0 or intval >= 2 ** 32:
            raise struct.error("integer out of range for 'I' format code")
        return struct.pack(b'!I', intval)
    elif length == 16:
        if intval < 0 or intval >= 2 ** 128:
            raise struct.error("integer out of range for 'QQ' format code")
        return struct.pack(b'!QQ', intval >> 64, intval & 0xffffffffffffffff)
    else:
        raise NotImplementedError() 

def ConfigureSystemProxy(proxy=CORP_PROXY, enable=True):
  """Sets the system proxy to the specified value."""
  scd_prefs = SCDynamicPreferences()
  if not scd_prefs.SetProxy(enable=enable, pac=proxy):
    logging.error('Could not change proxy settings.') 

def createPacket(data, size):
    # initialize temp variable list and packet
    temp = []
    packet = ''

    # Pop off "size" bytes and append to temporary list
    i = 0
    for i in range(size):
        try:
            a = data.popleft()
            temp.append(a)

        except IndexError:
            # simply an empty queue
            pass
    # Join list together and append two control bytes, convert to BASE64
    try:
        # TODO: Use better method of MSP430 header allocation
        payload = ''.join(temp)
        preamble = struct.pack("BB", 0, 0)  # Header for MSP430 firmware
        size = struct.pack("B", len(payload))
        framedPayload = size + payload
        packet = (preamble + framedPayload).encode('base64', 'strict')  # Proxy expects BASE64

    except TypeError as e:
        logger.error(e)

    except struct.error as e:
        logger.warning(e)

    except UnicodeError as e:
        logger.error(e)

    except StandardError as e:
        logger.info("StandardError")
        logger.error(e)

    return packet