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Python struct.unpack函数代码示例

本文整理汇总了Python中struct.unpack函数的典型用法代码示例。如果您正苦于以下问题:Python unpack函数的具体用法?Python unpack怎么用?Python unpack使用的例子?那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。


在下文中一共展示了unpack函数的15个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的Python代码示例。

示例1: _ofs_from_idx

 def _ofs_from_idx(self, idx):
     ofs = struct.unpack('!I', str(buffer(self.ofstable, idx*4, 4)))[0]
     if ofs & 0x80000000:
         idx64 = ofs & 0x7fffffff
         ofs = struct.unpack('!Q',
                             str(buffer(self.ofs64table, idx64*8, 8)))[0]
     return ofs
开发者ID:bryanwillis,项目名称:bup,代码行数:7,代码来源:git.py

示例2: _recv_dict

    def _recv_dict(self, pipe):
        """Receive a serialized dict on a pipe

        Returns the dictionary.
        """
        # Wire format:
        #   // Pipe sees (all numbers are longs, except for the first):
        #   // - num bytes in a long (sent as a single unsigned char!)
        #   // - num elements of the MIME dictionary; Jupyter selects one to display.
        #   // For each MIME dictionary element:
        #   //   - length of MIME type key
        #   //   - MIME type key
        #   //   - size of MIME data buffer (including the terminating 0 for
        #   //     0-terminated strings)
        #   //   - MIME data buffer
        data = {}
        b1 = os.read(pipe, 1)
        sizeof_long = struct.unpack('B', b1)[0]
        if sizeof_long == 8:
            fmt = 'Q'
        else:
            fmt = 'L'
        buf = os.read(pipe, sizeof_long)
        num_elements = struct.unpack(fmt, buf)[0]
        for i in range(num_elements):
            buf = os.read(pipe, sizeof_long)
            len_key = struct.unpack(fmt, buf)[0]
            key = os.read(pipe, len_key).decode('utf8')
            buf = os.read(pipe, sizeof_long)
            len_value = struct.unpack(fmt, buf)[0]
            value = os.read(pipe, len_value).decode('utf8')
            data[key] = value
        return data
开发者ID:A2-Collaboration,项目名称:root,代码行数:33,代码来源:clingkernel.py

示例3: saveScreenshot

    def saveScreenshot(self, filename):
        """
        Takes a screenshot of what's being display on the device. Uses
        "screencap" on newer (Android 3.0+) devices (and some older ones with
        the functionality backported). This function also works on B2G.

        Throws an exception on failure. This will always fail on devices
        without the screencap utility.
        """
        screencap = '/system/bin/screencap'
        if not self.fileExists(screencap):
            raise DMError("Unable to capture screenshot on device: no screencap utility")

        with open(filename, 'w') as pngfile:
            # newer versions of screencap can write directly to a png, but some
            # older versions can't
            tempScreenshotFile = self.getDeviceRoot() + "/ss-dm.tmp"
            self.shellCheckOutput(["sh", "-c", "%s > %s" %
                                   (screencap, tempScreenshotFile)],
                                  root=True)
            buf = self.pullFile(tempScreenshotFile)
            width = int(struct.unpack("I", buf[0:4])[0])
            height = int(struct.unpack("I", buf[4:8])[0])
            with open(filename, 'w') as pngfile:
                pngfile.write(self._writePNG(buf[12:], width, height))
            self.removeFile(tempScreenshotFile)
开发者ID:Tripleman,项目名称:mozilla-central,代码行数:26,代码来源:devicemanager.py

示例4: _decode_one

 def _decode_one(buf):
     self = navio_imu_t()
     self.timestamp = struct.unpack(">q", buf.read(8))[0]
     self.imu_pos = struct.unpack('>3q', buf.read(24))
     self.imu_vel = struct.unpack('>3q', buf.read(24))
     self.imu_acc = struct.unpack('>3q', buf.read(24))
     return self
开发者ID:gkravit,项目名称:avx,代码行数:7,代码来源:navio_imu_t.py

示例5: do_checksum_buffer

    def do_checksum_buffer(self, buf, checksum):
        self._discFrameCounter += 1

        # on first track ...
        if self._trackNumber == 1:
            # ... skip first 4 CD frames
            if self._discFrameCounter <= 4:
                gst.debug('skipping frame %d' % self._discFrameCounter)
                return checksum
            # ... on 5th frame, only use last value
            elif self._discFrameCounter == 5:
                values = struct.unpack("<I", buf[-4:])
                checksum += common.SAMPLES_PER_FRAME * 5 * values[0]
                checksum &= 0xFFFFFFFF
                return checksum

        # on last track, skip last 5 CD frames
        if self._trackNumber == self._trackCount:
            discFrameLength = self._sampleLength / common.SAMPLES_PER_FRAME
            if self._discFrameCounter > discFrameLength - 5:
                self.debug('skipping frame %d', self._discFrameCounter)
                return checksum

        values = struct.unpack("<%dI" % (len(buf) / 4), buf)
        for i, value in enumerate(values):
            # self._bytes is updated after do_checksum_buffer
            checksum += (self._bytes / 4 + i + 1) * value
            checksum &= 0xFFFFFFFF
            # offset = self._bytes / 4 + i + 1
            # if offset % common.SAMPLES_PER_FRAME == 0:
            #   print 'frame %d, ends before %d, last value %08x, CRC %08x' % (
            #     offset / common.SAMPLES_PER_FRAME, offset, value, sum)

        return checksum
开发者ID:JamesKoenig,项目名称:morituri,代码行数:34,代码来源:checksum.py

示例6: getRSSI

    def getRSSI(self):
        """Detects whether the device is near by or not"""
        addr = self.address
		
        # Open hci socket
        hci_sock = bt.hci_open_dev()
        hci_fd = hci_sock.fileno()

        # Connect to device (to whatever you like)
        bt_sock = bluetooth.BluetoothSocket(bluetooth.L2CAP)
        bt_sock.settimeout(10)
        result = bt_sock.connect_ex((addr, 1))	# PSM 1 - Service Discovery

        try:
            # Get ConnInfo
            reqstr = struct.pack("6sB17s", bt.str2ba(addr), bt.ACL_LINK, "\0" * 17)
            request = array.array("c", reqstr )
            handle = fcntl.ioctl(hci_fd, bt.HCIGETCONNINFO, request, 1)
            handle = struct.unpack("8xH14x", request.tostring())[0]

            # Get RSSI
            cmd_pkt=struct.pack('H', handle)
            rssi = bt.hci_send_req(hci_sock, bt.OGF_STATUS_PARAM,
                         bt.OCF_READ_RSSI, bt.EVT_CMD_COMPLETE, 4, cmd_pkt)
            rssi = struct.unpack('b', rssi[3])[0]

            # Close sockets
            bt_sock.close()
            hci_sock.close()

            return rssi

        except Exception, e:
            return None
开发者ID:lennysh,项目名称:mqttReporter,代码行数:34,代码来源:bluetoothRSSIScanner.py

示例7: _version_response

	def _version_response(self, endpoint, data):
		fw_names = {
			0: "normal_fw",
			1: "recovery_fw"
		}

		resp = {}
		for i in xrange(2):
			fwver_size = 47
			offset = i*fwver_size+1
			fw = {}
			fw["timestamp"],fw["version"],fw["commit"],fw["is_recovery"], \
				fw["hardware_platform"],fw["metadata_ver"] = \
				unpack("!i32s8s?bb", data[offset:offset+fwver_size])

			fw["version"] = fw["version"].replace("\x00", "")
			fw["commit"] = fw["commit"].replace("\x00", "")

			fw_name = fw_names[i]
			resp[fw_name] = fw

		resp["bootloader_timestamp"],resp["hw_version"],resp["serial"] = \
			unpack("!L9s12s", data[95:120])

		resp["hw_version"] = resp["hw_version"].replace("\x00","")

		btmac_hex = binascii.hexlify(data[120:126])
		resp["btmac"] = ":".join([btmac_hex[i:i+2].upper() for i in reversed(xrange(0, 12, 2))])

		return resp
开发者ID:orviwan,项目名称:libpebble,代码行数:30,代码来源:pebble.py

示例8: getInfo

def getInfo(dbfile):
    header_part = HEADER_SIZE/4
    ftree = open(dbfile, "r")

    ftree.seek(header_part)
    buf = ftree.read(header_part)

    key_len = struct.unpack("!L", buf.decode('hex'))[0]

    buf = ftree.read(header_part)
    max_user_id = struct.unpack("!L", buf.decode('hex'))[0]

    buf = ftree.read(header_part)
    next_user_id = struct.unpack("!L", buf.decode('hex'))[0]

    info = DBInfo()

    info.key_len = key_len
    info.max_user_id = max_user_id
    info.min_user_id = max_user_id>>1
    if(next_user_id == info.min_user_id):
        info.current_user_id = 0 # no new user exists
    else:
        info.current_user_id = next_user_id-1

    ftree.close()
    return info
开发者ID:casibbald,项目名称:kamaelia,代码行数:27,代码来源:btree.py

示例9: gen_subkeys

def gen_subkeys(K,cipher):
    """Generate subkeys of cipher"""
    from struct import pack, unpack
    
    L = cipher.encrypt("00000000000000000000000000000000".decode("hex"))

    LHigh = unpack(">Q",L[:8])[0]
    LLow  = unpack(">Q",L[8:])[0]

    K1High = ((LHigh << 1) | ( LLow >> 63 )) & 0xFFFFFFFFFFFFFFFF
    K1Low  = (LLow << 1) & 0xFFFFFFFFFFFFFFFF

    if (LHigh >> 63):
        K1Low ^= 0x87

    K2High = ((K1High << 1) | (K1Low >> 63)) & 0xFFFFFFFFFFFFFFFF
    K2Low  = ((K1Low << 1)) & 0xFFFFFFFFFFFFFFFF

    if (K1High >> 63):
        K2Low ^= 0x87

    K1 = pack(">QQ", K1High, K1Low)
    K2 = pack(">QQ", K2High, K2Low)

    return K1, K2
开发者ID:joren485,项目名称:Mifare-Key-Diversification,代码行数:25,代码来源:key-diversification.py

示例10: read_xbs_chunk

def read_xbs_chunk(stream):
    """Read one chunk from the underlying xbstream file object

    :param stream: a file-like object
    :returns: XBSChunk instance
    """
    header = stream.read(XBS_HEADER_SIZE)
    if not header:
        # end of stream
        return None

    magic, flags, _type, pathlen = struct.unpack(b'<8sBcI', header)

    if magic != XBS_MAGIC:
        raise common.UnpackError("Incorrect magic '%s' in chunk" % magic)

    path = stream.read(pathlen)

    if _type == b'E':
        return XBSChunk(flags, _type, path, b'', None)
    elif _type != b'P':
        raise common.UnpackError("Unknown chunk type '%r'" % _type)

    payload_length, payload_offset = struct.unpack(b'<QQ', stream.read(16))
    checksum, = struct.unpack(b'<I', stream.read(4))
    payload = stream.read(payload_length)

    computed_checksum = zlib.crc32(payload) & 0xffffffff

    if checksum != computed_checksum:
        raise common.UnpackError("Invalid checksum(offset=%d path=%s)" %
                                 (payload_offset, path))

    return XBSChunk(flags, _type, path, payload, payload_offset)
开发者ID:abg,项目名称:dbsake,代码行数:34,代码来源:xbs.py

示例11: getUserConfig

def getUserConfig(dbfile, user_id):
    header_part = HEADER_SIZE/4
    ftree = open(dbfile, "r")
    ftree.seek(header_part)
    buf = ftree.read(header_part)
    key_len = struct.unpack("!L", buf.decode('hex'))[0]

    buf = ftree.read(header_part)
    max_user_id = struct.unpack("!L", buf.decode('hex'))[0]

    if( (user_id < max_user_id/2) or (user_id > max_user_id -1)):
        print "user id ", user_id, " not found"
        return

    print "#user key configuration"
    print "user_id=", user_id
    print "key_len=", key_len
    while(user_id != 0):
        ftree.seek(HEADER_SIZE + (user_id * key_len))
        key = ftree.read(key_len)
        print user_id, "=", key
        user_id = user_id >> 1


    ftree.close()
开发者ID:casibbald,项目名称:kamaelia,代码行数:25,代码来源:btree.py

示例12: read

    def read(self, fp, length, endian, param):
        """
        read data from fp
        :param fp: file pointer
        :param length: length to be readed
        :param endian: endian type in datafile
        :type param: list
        :param param: sampling rate,sample size, block time, channels
        :rtype: list of list
        :return: list of data
        """

        buff = fp.read(length)
        samplrate = param[0]
        numbyte = param[1]
        numchan = param[3].count(1)
        num = (samplrate/10)*numbyte*numchan
        data = [[] for _ in range(numchan)]
        if (length != num):
            raise EVTBadDataError("Bad data lenght")
        for j in range(samplrate/10):
            for k in range(numchan):
                i = (j*numchan)+k
                if numbyte == 2:
                    val = unpack(">i", buff[i*2:(i*2)+2] + '\0\0')[0] >> 8
                elif numbyte == 3:
                    val = unpack(">i", buff[i*3:(i*3)+3] + '\0')[0] >> 8
                elif numbyte == 4:
                    val = unpack(">i", buff[i*4:(i*4)+4])[0]
                else:
                    raise EVTBadDataError("Bad data format")
                data[k].append(val)
        return data
开发者ID:vcoeur61,项目名称:evt,代码行数:33,代码来源:evt.py

示例13: read_binary_int

 def read_binary_int(self, fname,fp,length):
     '''
     read a binary int value
     '''
     if length > 3:
         raise CFFormatError('Integer greater than 8 bytes: %s' % length)
 
     nbytes = 1 << length
     val = None
     buff = fp.read(nbytes)
 
     if length == 0:
         val = unpack('>B', buff)
         val = val[0]
     elif length == 1:
         val = unpack('>H', buff)
         val = val[0]
     elif length == 2:
         val = unpack('>L', buff)
         val = val[0]
     elif length == 3:
         (hiword,loword) = unpack('>LL', buff)
         if not (hiword & 0x80000000) == 0:
             # 8 byte integers are always signed, and are negative when bit
             # 63 is set. Decoding into either a Fixnum or Bignum is tricky,
             # however, because the size of a Fixnum varies among systems,
             # and Ruby doesn't consider the number to be negative, and
             # won't sign extend.
             val = -(2**63 - ((hiword & 0x7fffffff) << 32 | loword))
         else:
             val = hiword << 32 | loword
     
     return CFInteger(val)
开发者ID:hboon,项目名称:CFPropertyList,代码行数:33,代码来源:CFPropertyList.py

示例14: init_cam

def init_cam():
    global PASSWORD
    try:
        bcv = httpopen('http://%s/bacpac/cv' % CAM_IP).read()
        print('bacpac CV:', repr(bcv))
        bacpac_version = struct.unpack('BBB', bcv[9:12])
        bacpac_version = '.'.join([str(x) for x in bacpac_version])
        print('   bacpac version:', bacpac_version)
        bacpac_mac = bcv[12:18]
        bacpac_mac = ':'.join(['%02x' % x for x in bacpac_mac])
        print('bacpac mac:', bacpac_mac)
        bacpac_name = bcv[19:].decode('utf-8')
        print('bacpac name:', bacpac_name)
        
        bsd = httpopen('http://%s/bacpac/sd' % CAM_IP).read()
        print('bacpac SD:', repr(bsd))
        PASSWORD = bsd[2:].decode('utf-8')
        print('bacpac password', PASSWORD)
     
        ccv = httpopen('http://%s/camera/cv' % CAM_IP).read()
        print('camera CV:', repr(ccv))
        # b'\x00\x00\x01\x13HD2.08.12.198.47.00\x05HERO2'
        dlen = struct.unpack('B', ccv[3:4])[0]
        camera_version = ccv[4:4+dlen].decode('UTF-8')
        print('camera version', camera_version)
        ipos = 4+dlen
        dlen = struct.unpack('B', ccv[ipos:ipos+1])[0]
        ipos += 1
        camera_model = ccv[ipos:ipos+dlen].decode('UTF-8')
        print('camera_model', camera_model) #FIXME this is the CN parameter
        return True
    except (urllib.error.HTTPError, urllib.error.URLError, socket.error):
        print('Error communicating with bacpac/camera')
        return False
开发者ID:nsfw,项目名称:heromote,代码行数:34,代码来源:heromote.py

示例15: recieve_data

    def recieve_data(self):
        buffer = ''

        # recieve junk
        prev_byte = '\x00'
        while 1:
            cur_byte = self.ser.read(1)
            if prev_byte + cur_byte == HEADER:
                # header found, stop
                break
            prev_byte  = cur_byte

        length = struct.unpack('<H', self.get_n_bytes(2)) [0]

        packet = self.get_n_bytes(length, True)

        reserved, command = struct.unpack('<HH', packet[:4])
        data = packet[4:-1]
        checksum = ord(packet[-1])

        #~ print self.tohex(packet[:-1])

        packet_int = map(ord, packet[:-1])
        checksum_calc = reduce( lambda x,y:  x^y,  packet_int  )

        if data[0] == '\x00':
            if checksum != checksum_calc:
                raise Exception, "bad checksum"


        return command, data
开发者ID:chaplin1999,项目名称:yhy632,代码行数:31,代码来源:yh632.py


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