Python TlvEncoder.writeOptionalNonNegativeIntegerTlv方法代码示例

# 需要导入模块: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 别名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeOptionalNonNegativeIntegerTlv [as 别名]
    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)

# 需要导入模块: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 别名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeOptionalNonNegativeIntegerTlv [as 别名]
    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)

# 需要导入模块: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 别名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeOptionalNonNegativeIntegerTlv [as 别名]
    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)

# 需要导入模块: from pyndn.encoding.tlv.tlv_encoder import TlvEncoder [as 别名]
# 或者: from pyndn.encoding.tlv.tlv_encoder.TlvEncoder import writeOptionalNonNegativeIntegerTlv [as 别名]
    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)