Python TlvEncoder.writeTypeAndLength方法代碼示例

# 需要導入模塊: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 別名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeTypeAndLength [as 別名]
    def encodeForwardingEntry(self, forwardingEntry):
        """
        Encode forwardingEntry and return the encoding.

        :param forwardingEntry: The ForwardingEntry object to encode.
        :type forwardingEntry: ForwardingEntry
        :return: A Blob containing the encoding.
        :rtype: Blob
        """
        encoder = TlvEncoder(256)
        saveLength = len(encoder)

        # Encode backwards.
        encoder.writeOptionalNonNegativeIntegerTlvFromFloat(
          Tlv.FreshnessPeriod, forwardingEntry.getFreshnessPeriod())
        encoder.writeNonNegativeIntegerTlv(
          Tlv.ForwardingFlags,
          forwardingEntry.getForwardingFlags().getForwardingEntryFlags())
        encoder.writeOptionalNonNegativeIntegerTlv(
          Tlv.FaceID, forwardingEntry.getFaceId())
        self._encodeName(forwardingEntry.getPrefix(), encoder)
        if (forwardingEntry.getAction() != None and
             len(forwardingEntry.getAction()) > 0):
            # Convert str to a bytearray.
            encoder.writeBlobTlv(
              Tlv.Action, bytearray(forwardingEntry.getAction(), 'ascii'))

        encoder.writeTypeAndLength(Tlv.ForwardingEntry,
                                   len(encoder) - saveLength)

        return Blob(encoder.getOutput(), False)

# 需要導入模塊: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 別名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeTypeAndLength [as 別名]
    def encodeEncryptedContent(self, encryptedContent):
        """
        Encode the EncryptedContent in NDN-TLV and return the encoding.

        :param EncryptedContent encryptedContent: The EncryptedContent object to
          encode.
        :return: A Blob containing the encoding.
        :rtype: Blob
        """
        encoder = TlvEncoder(256)
        saveLength = len(encoder)

        # Encode backwards.
        encoder.writeBlobTlv(
          Tlv.Encrypt_EncryptedPayload, encryptedContent.getPayload().buf())
        encoder.writeOptionalBlobTlv(
          Tlv.Encrypt_InitialVector, encryptedContent.getInitialVector().buf())
        # Assume the algorithmType value is the same as the TLV type.
        encoder.writeNonNegativeIntegerTlv(
          Tlv.Encrypt_EncryptionAlgorithm, encryptedContent.getAlgorithmType())
        Tlv0_1_1WireFormat._encodeKeyLocator(
          Tlv.KeyLocator, encryptedContent.getKeyLocator(), encoder)

        encoder.writeTypeAndLength(
          Tlv.Encrypt_EncryptedContent, len(encoder) - saveLength)

        return Blob(encoder.getOutput(), False)

# 需要導入模塊: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 別名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeTypeAndLength [as 別名]
    def encodeData(self, data):
        """
        Encode data in NDN-TLV and return the encoding and signed offsets.

        :param Data data: The Data object to encode.
        :return: A Tuple of (encoding, signedPortionBeginOffset,
          signedPortionEndOffset) where encoding is a Blob containing the
          encoding, signedPortionBeginOffset is the offset in the encoding of
          the beginning of the signed portion, and signedPortionEndOffset is
          the offset in the encoding of the end of the signed portion.
        :rtype: (Blob, int, int)
        """
        encoder = TlvEncoder(1500)
        saveLength = len(encoder)

        # Encode backwards.
        # TODO: The library needs to handle other signature types than
        #   SignatureSha256WithRsa.
        encoder.writeBlobTlv(Tlv.SignatureValue,
                             data.getSignature().getSignature().buf())
        signedPortionEndOffsetFromBack = len(encoder)

        self._encodeSignatureSha256WithRsa(data.getSignature(), encoder)
        encoder.writeBlobTlv(Tlv.Content, data.getContent().buf())
        self._encodeMetaInfo(data.getMetaInfo(), encoder)
        self._encodeName(data.getName(), encoder)
        signedPortionBeginOffsetFromBack = len(encoder)

        encoder.writeTypeAndLength(Tlv.Data, len(encoder) - saveLength)
        signedPortionBeginOffset = (len(encoder) -
                                    signedPortionBeginOffsetFromBack)
        signedPortionEndOffset = len(encoder) - signedPortionEndOffsetFromBack

        return (Blob(encoder.getOutput(), False), signedPortionBeginOffset,
                signedPortionEndOffset)

# 需要導入模塊: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 別名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeTypeAndLength [as 別名]
    def encodeDelegationSet(self, delegationSet):
        """
        Encode the DelegationSet in NDN-TLV and return the encoding. Note that
        the sequence of Delegation does not have an outer TLV type and length
        because it is intended to use the type and length of a Data packet's
        Content.

        :param DelegationSet delegationSet: The DelegationSet object to
          encode.
        :return: A Blob containing the encoding.
        :rtype: Blob
        """
        encoder = TlvEncoder(256)

        # Encode backwards.
        for i in range(delegationSet.size() - 1, -1, -1):
            saveLength = len(encoder)

            Tlv0_1_1WireFormat._encodeName(delegationSet.get(i).getName(), encoder)
            encoder.writeNonNegativeIntegerTlv(
              Tlv.Link_Preference, delegationSet.get(i).getPreference())

            encoder.writeTypeAndLength(
              Tlv.Link_Delegation, len(encoder) - saveLength)

        return Blob(encoder.getOutput(), False)

# 需要導入模塊: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 別名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeTypeAndLength [as 別名]
    def encodeControlResponse(self, controlResponse):
        """
        Encode controlResponse and return the encoding.

        :param controlResponse: The ControlResponse object to encode.
        :type controlResponse: ControlResponse
        :return: A Blob containing the encoding.
        :rtype: Blob
        """
        encoder = TlvEncoder(256)
        saveLength = len(encoder)

        # Encode backwards.

        # Encode the body.
        if controlResponse.getBodyAsControlParameters() != None:
            self._encodeControlParameters(
              controlResponse.getBodyAsControlParameters(), encoder)

        encoder.writeBlobTlv(
          Tlv.NfdCommand_StatusText, Blob(controlResponse.getStatusText()).buf())
        encoder.writeNonNegativeIntegerTlv(
          Tlv.NfdCommand_StatusCode, controlResponse.getStatusCode())

        encoder.writeTypeAndLength(Tlv.NfdCommand_ControlResponse,
                                   len(encoder) - saveLength)

        return Blob(encoder.getOutput(), False)

# 需要導入模塊: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 別名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeTypeAndLength [as 別名]
    def encodeInterest(self, interest):
        """
        Encode interest in NDN-TLV and return the encoding.

        :param Interest interest: The Interest object to encode.
        :return: A Blob containing the encoding.
        :rtype: Blob
        """
        encoder = TlvEncoder(256)
        saveLength = len(encoder)

        # Encode backwards.
        encoder.writeOptionalNonNegativeIntegerTlvFromFloat(
          Tlv.InterestLifetime, interest.getInterestLifetimeMilliseconds())
        encoder.writeOptionalNonNegativeIntegerTlv(
          Tlv.Scope, interest.getScope())

        # Encode the Nonce as 4 bytes.
        if interest.getNonce().size() == 0:
            # This is the most common case. Generate a nonce.
            nonce = bytearray(4)
            for i in range(4):
                nonce[i] = _systemRandom.randint(0, 0xff)
            encoder.writeBlobTlv(Tlv.Nonce, nonce)
        elif interest.getNonce().size() < 4:
            nonce = bytearray(4)
            # Copy existing nonce bytes.
            nonce[:interest.getNonce().size()] = interest.getNonce().buf()

            # Generate random bytes for remaining bytes in the nonce.
            for i in range(interest.getNonce().size(), 4):
                nonce[i] = _systemRandom.randint(0, 0xff)

            encoder.writeBlobTlv(Tlv.Nonce, nonce)
        elif interest.getNonce().size() == 4:
            # Use the nonce as-is.
            encoder.writeBlobTlv(Tlv.Nonce, interest.getNonce().buf())
        else:
            # Truncate.
            encoder.writeBlobTlv(Tlv.Nonce, interest.getNonce().buf()[:4])

        self._encodeSelectors(interest, encoder)
        self._encodeName(interest.getName(), encoder)

        encoder.writeTypeAndLength(Tlv.Interest, len(encoder) - saveLength)

        return Blob(encoder.getOutput(), False)

# 需要導入模塊: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 別名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeTypeAndLength [as 別名]
    def encodeControlParameters(self, controlParameters):
        """
        Encode controlParameters and return the encoding.

        :param controlParameters: The ControlParameters object to encode.
        :type controlParameters: ControlParameters
        :return: A Blob containing the encoding.
        :rtype: Blob
        """
        encoder = TlvEncoder(256)
        saveLength = len(encoder)

        # Encode backwards.
        encoder.writeOptionalNonNegativeIntegerTlvFromFloat(
          Tlv.ControlParameters_ExpirationPeriod,
          controlParameters.getExpirationPeriod())

        # TODO: Encode Strategy.

        flags = controlParameters.getForwardingFlags().getNfdForwardingFlags()
        if (flags != ForwardingFlags().getNfdForwardingFlags()):
            # The flags are not the default value.
            encoder.writeNonNegativeIntegerTlv(
              Tlv.ControlParameters_Flags, flags)

        encoder.writeOptionalNonNegativeIntegerTlv(
          Tlv.ControlParameters_Cost, controlParameters.getCost())
        encoder.writeOptionalNonNegativeIntegerTlv(
          Tlv.ControlParameters_Origin, controlParameters.getOrigin())
        encoder.writeOptionalNonNegativeIntegerTlv(
          Tlv.ControlParameters_LocalControlFeature,
          controlParameters.getLocalControlFeature())

        # TODO: Encode Uri.

        encoder.writeOptionalNonNegativeIntegerTlv(
          Tlv.ControlParameters_FaceId, controlParameters.getFaceId())
        if controlParameters.getName().size() > 0:
          self._encodeName(controlParameters.getName(), encoder)

        encoder.writeTypeAndLength(Tlv.ControlParameters_ControlParameters,
                                   len(encoder) - saveLength)

        return Blob(encoder.getOutput(), False)

# 需要導入模塊: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 別名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeTypeAndLength [as 別名]
    def _encodeLpNack(interest, networkNack):
        """
        Encode the interest into an NDN-TLV LpPacket as a NACK with the reason
        code in the networkNack object.
        TODO: Generalize this and move to WireFormat.encodeLpPacket.
        
        :param Interest interest: The Interest to put in the LpPacket fragment.
        :param NetworkNack networkNack: The NetworkNack with the reason code.
        :return: A Blob containing the encoding.
        :rtype: Blob
        """
        encoder = TlvEncoder(256)
        saveLength = len(encoder)

        # Encode backwards.
        # Encode the fragment with the Interest.
        encoder.writeBlobTlv(
          Tlv.LpPacket_Fragment, interest.wireEncode(TlvWireFormat.get()).buf())

        # Encode the reason.
        if (networkNack.getReason() == NetworkNack.Reason.NONE or
             networkNack.getReason() == NetworkNack.Reason.CONGESTION or
             networkNack.getReason() == NetworkNack.Reason.DUPLICATE or
             networkNack.getReason() == NetworkNack.Reason.NO_ROUTE):
            # The Reason enum is set up with the correct integer for each NDN-TLV Reason.
            reason = networkNack.getReason()
        elif networkNack.getReason() == NetworkNack.Reason.OTHER_CODE:
            reason = networkNack.getOtherReasonCode()
        else:
            # We don't expect this to happen.
            raise RuntimeError("unrecognized NetworkNack.getReason() value")

        nackSaveLength = len(encoder)
        encoder.writeNonNegativeIntegerTlv(Tlv.LpPacket_NackReason, reason)
        encoder.writeTypeAndLength(
          Tlv.LpPacket_Nack, len(encoder) - nackSaveLength)

        encoder.writeTypeAndLength(
          Tlv.LpPacket_LpPacket, len(encoder) - saveLength)

        return Blob(encoder.getOutput(), False)

# 需要導入模塊: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 別名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeTypeAndLength [as 別名]
    def wireEncode(self):
        """
        Encode this Schedule.

        :return: The encoded buffer.
        :rtype: Blob
        """
        # For now, don't use WireFormat and hardcode to use TLV since the
        # encoding doesn't go out over the wire, only into the local SQL database.
        encoder = TlvEncoder(256)
        saveLength = len(encoder)

        # Encode backwards.
        # Encode the blackIntervalList.
        saveLengthForList = len(encoder)
        for i in range(len(self._blackIntervalList) - 1, -1, -1):
            Schedule._encodeRepetitiveInterval(self._blackIntervalList[i], encoder)
        encoder.writeTypeAndLength(Tlv.Encrypt_BlackIntervalList, len(encoder) - saveLengthForList)

        # Encode the whiteIntervalList.
        saveLengthForList = len(encoder)
        for i in range(len(self._whiteIntervalList) - 1, -1, -1):
            Schedule._encodeRepetitiveInterval(self._whiteIntervalList[i], encoder)
        encoder.writeTypeAndLength(Tlv.Encrypt_WhiteIntervalList, len(encoder) - saveLengthForList)

        encoder.writeTypeAndLength(Tlv.Encrypt_Schedule, len(encoder) - saveLength)

        return Blob(encoder.getOutput(), False)

# 需要導入模塊: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 別名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeTypeAndLength [as 別名]
    def wireEncode(self, wireFormat = None):
        """
        Encode this as an NDN-TLV SafeBag.

        :return: The encoded byte array as a Blob.
        :rtype: Blob
        """
        # Encode directly as TLV. We don't support the WireFormat abstraction
        # because this isn't meant to go directly on the wire.
        encoder = TlvEncoder(256)
        saveLength = len(encoder)

        # Encode backwards.
        encoder.writeBlobTlv(
          Tlv.SafeBag_EncryptedKeyBag, self._privateKeyBag.buf())
        # Add the entire Data packet encoding as is.
        encoder.writeBuffer(
          self._certificate.wireEncode(TlvWireFormat.get()).buf())

        encoder.writeTypeAndLength(
          Tlv.SafeBag_SafeBag, len(encoder) - saveLength)

        return Blob(encoder.getOutput(), False)

# 需要導入模塊: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 別名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeTypeAndLength [as 別名]
    def encodeInterest(self, interest):
        """
        Encode interest in NDN-TLV and return the encoding.

        :param Interest interest: The Interest object to encode.
        :return: A Tuple of (encoding, signedPortionBeginOffset,
          signedPortionEndOffset) where encoding is a Blob containing the
          encoding, signedPortionBeginOffset is the offset in the encoding of
          the beginning of the signed portion, and signedPortionEndOffset is
          the offset in the encoding of the end of the signed portion. The
          signed portion starts from the first name component and ends just
          before the final name component (which is assumed to be a signature
          for a signed interest).
        :rtype: (Blob, int, int)
        """
        encoder = TlvEncoder(256)
        saveLength = len(encoder)

        # Encode backwards.
        encoder.writeOptionalNonNegativeIntegerTlvFromFloat(
          Tlv.InterestLifetime, interest.getInterestLifetimeMilliseconds())
        encoder.writeOptionalNonNegativeIntegerTlv(
          Tlv.Scope, interest.getScope())

        # Encode the Nonce as 4 bytes.
        if interest.getNonce().size() == 0:
            # This is the most common case. Generate a nonce.
            nonce = bytearray(4)
            for i in range(4):
                nonce[i] = _systemRandom.randint(0, 0xff)
            encoder.writeBlobTlv(Tlv.Nonce, nonce)
        elif interest.getNonce().size() < 4:
            nonce = bytearray(4)
            # Copy existing nonce bytes.
            nonce[:interest.getNonce().size()] = interest.getNonce().buf()

            # Generate random bytes for remaining bytes in the nonce.
            for i in range(interest.getNonce().size(), 4):
                nonce[i] = _systemRandom.randint(0, 0xff)

            encoder.writeBlobTlv(Tlv.Nonce, nonce)
        elif interest.getNonce().size() == 4:
            # Use the nonce as-is.
            encoder.writeBlobTlv(Tlv.Nonce, interest.getNonce().buf())
        else:
            # Truncate.
            encoder.writeBlobTlv(Tlv.Nonce, interest.getNonce().buf()[:4])

        self._encodeSelectors(interest, encoder)

        (tempSignedPortionBeginOffset, tempSignedPortionEndOffset) = \
          self._encodeName(interest.getName(), encoder)
        signedPortionBeginOffsetFromBack = (len(encoder) -
                                            tempSignedPortionBeginOffset)
        signedPortionEndOffsetFromBack = (len(encoder) -
                                          tempSignedPortionEndOffset)

        encoder.writeTypeAndLength(Tlv.Interest, len(encoder) - saveLength)
        signedPortionBeginOffset = (len(encoder) -
                                    signedPortionBeginOffsetFromBack)
        signedPortionEndOffset = len(encoder) - signedPortionEndOffsetFromBack

        return (Blob(encoder.getOutput(), False), signedPortionBeginOffset,
                signedPortionEndOffset)