/// <summary>
/// Encode interest using NDN-TLV and return the encoding.
/// </summary>
///
/// <param name="interest">The Interest object to encode.</param>
/// <param name="signedPortionBeginOffset">name component and ends just before the final name component (which is assumed to be a signature for a signed interest).</param>
/// <param name="signedPortionEndOffset">name component and ends just before the final name component (which is assumed to be a signature for a signed interest).</param>
/// <returns>A Blob containing the encoding.</returns>
public override Blob encodeInterest(Interest interest,
int[] signedPortionBeginOffset, int[] signedPortionEndOffset)
{
TlvEncoder encoder = new TlvEncoder();
int saveLength = encoder.getLength();
// Encode backwards.
encoder.writeOptionalNonNegativeIntegerTlv(net.named_data.jndn.encoding.tlv.Tlv.SelectedDelegation,
interest.getSelectedDelegationIndex());
try {
Blob linkWireEncoding = interest.getLinkWireEncoding(this);
if (!linkWireEncoding.isNull())
// Encode the entire link as is.
encoder.writeBuffer(linkWireEncoding.buf());
} catch (EncodingException ex) {
throw new Exception(ex.Message);
}
encoder.writeOptionalNonNegativeIntegerTlvFromDouble(
net.named_data.jndn.encoding.tlv.Tlv.InterestLifetime,
interest.getInterestLifetimeMilliseconds());
// Encode the Nonce as 4 bytes.
if (interest.getNonce().size() == 0) {
// This is the most common case. Generate a nonce.
ByteBuffer nonce = ILOG.J2CsMapping.NIO.ByteBuffer.allocate(4);
random_.nextBytes(nonce.array());
encoder.writeBlobTlv(net.named_data.jndn.encoding.tlv.Tlv.Nonce, nonce);
} else if (interest.getNonce().size() < 4) {
ByteBuffer nonce_0 = ILOG.J2CsMapping.NIO.ByteBuffer.allocate(4);
// Copy existing nonce bytes.
nonce_0.put(interest.getNonce().buf());
// Generate random bytes for remaining bytes in the nonce.
for (int i = 0; i < 4 - interest.getNonce().size(); ++i)
nonce_0.put((byte) random_.Next());
nonce_0.flip();
encoder.writeBlobTlv(net.named_data.jndn.encoding.tlv.Tlv.Nonce, nonce_0);
} else if (interest.getNonce().size() == 4)
// Use the nonce as-is.
encoder.writeBlobTlv(net.named_data.jndn.encoding.tlv.Tlv.Nonce, interest.getNonce().buf());
else {
// Truncate.
ByteBuffer nonce_1 = interest.getNonce().buf();
// buf() returns a new ByteBuffer, so we can change its limit.
nonce_1.limit(nonce_1.position() + 4);
encoder.writeBlobTlv(net.named_data.jndn.encoding.tlv.Tlv.Nonce, nonce_1);
}
encodeSelectors(interest, encoder);
int[] tempSignedPortionBeginOffset = new int[1];
int[] tempSignedPortionEndOffset = new int[1];
encodeName(interest.getName(), tempSignedPortionBeginOffset,
tempSignedPortionEndOffset, encoder);
int signedPortionBeginOffsetFromBack = encoder.getLength()
- tempSignedPortionBeginOffset[0];
int signedPortionEndOffsetFromBack = encoder.getLength()
- tempSignedPortionEndOffset[0];
encoder.writeTypeAndLength(net.named_data.jndn.encoding.tlv.Tlv.Interest, encoder.getLength()
- saveLength);
signedPortionBeginOffset[0] = encoder.getLength()
- signedPortionBeginOffsetFromBack;
signedPortionEndOffset[0] = encoder.getLength()
- signedPortionEndOffsetFromBack;
return new Blob(encoder.getOutput(), false);
}
private static void encodeControlParameters(
ControlParameters controlParameters, TlvEncoder encoder)
{
int saveLength = encoder.getLength();
// Encode backwards.
encoder.writeOptionalNonNegativeIntegerTlvFromDouble(
net.named_data.jndn.encoding.tlv.Tlv.ControlParameters_ExpirationPeriod,
controlParameters.getExpirationPeriod());
// Encode strategy
if (controlParameters.getStrategy().size() != 0) {
int strategySaveLength = encoder.getLength();
encodeName(controlParameters.getStrategy(), new int[1], new int[1],
encoder);
encoder.writeTypeAndLength(net.named_data.jndn.encoding.tlv.Tlv.ControlParameters_Strategy,
encoder.getLength() - strategySaveLength);
}
// Encode ForwardingFlags
int flags = controlParameters.getForwardingFlags()
.getNfdForwardingFlags();
if (flags != new ForwardingFlags().getNfdForwardingFlags())
// The flags are not the default value.
encoder.writeNonNegativeIntegerTlv(net.named_data.jndn.encoding.tlv.Tlv.ControlParameters_Flags,
flags);
encoder.writeOptionalNonNegativeIntegerTlv(net.named_data.jndn.encoding.tlv.Tlv.ControlParameters_Cost,
controlParameters.getCost());
encoder.writeOptionalNonNegativeIntegerTlv(
net.named_data.jndn.encoding.tlv.Tlv.ControlParameters_Origin, controlParameters.getOrigin());
encoder.writeOptionalNonNegativeIntegerTlv(
net.named_data.jndn.encoding.tlv.Tlv.ControlParameters_LocalControlFeature,
controlParameters.getLocalControlFeature());
// Encode URI
if (controlParameters.getUri().Length != 0) {
encoder.writeBlobTlv(net.named_data.jndn.encoding.tlv.Tlv.ControlParameters_Uri, new Blob(
controlParameters.getUri()).buf());
}
encoder.writeOptionalNonNegativeIntegerTlv(
net.named_data.jndn.encoding.tlv.Tlv.ControlParameters_FaceId, controlParameters.getFaceId());
// Encode name
if (controlParameters.getName() != null) {
encodeName(controlParameters.getName(), new int[1], new int[1],
encoder);
}
encoder.writeTypeAndLength(net.named_data.jndn.encoding.tlv.Tlv.ControlParameters_ControlParameters,
encoder.getLength() - saveLength);
}
private static void encodeMetaInfo(MetaInfo metaInfo, TlvEncoder encoder)
{
int saveLength = encoder.getLength();
// Encode backwards.
ByteBuffer finalBlockIdBuf = metaInfo.getFinalBlockId().getValue()
.buf();
if (finalBlockIdBuf != null && finalBlockIdBuf.remaining() > 0) {
// FinalBlockId has an inner NameComponent.
int finalBlockIdSaveLength = encoder.getLength();
encodeNameComponent(metaInfo.getFinalBlockId(), encoder);
encoder.writeTypeAndLength(net.named_data.jndn.encoding.tlv.Tlv.FinalBlockId, encoder.getLength()
- finalBlockIdSaveLength);
}
encoder.writeOptionalNonNegativeIntegerTlvFromDouble(
net.named_data.jndn.encoding.tlv.Tlv.FreshnessPeriod, metaInfo.getFreshnessPeriod());
if (!(metaInfo.getType() == net.named_data.jndn.ContentType.BLOB)) {
// Not the default, so we need to encode the type.
if (metaInfo.getType() == net.named_data.jndn.ContentType.LINK
|| metaInfo.getType() == net.named_data.jndn.ContentType.KEY
|| metaInfo.getType() == net.named_data.jndn.ContentType.NACK)
// The ContentType enum is set up with the correct integer for
// each NDN-TLV ContentType.
encoder.writeNonNegativeIntegerTlv(net.named_data.jndn.encoding.tlv.Tlv.ContentType, metaInfo
.getType().getNumericType());
else if (metaInfo.getType() == net.named_data.jndn.ContentType.OTHER_CODE)
encoder.writeNonNegativeIntegerTlv(net.named_data.jndn.encoding.tlv.Tlv.ContentType,
metaInfo.getOtherTypeCode());
else
// We don't expect this to happen.
throw new Exception("unrecognized TLV ContentType");
}
encoder.writeTypeAndLength(net.named_data.jndn.encoding.tlv.Tlv.MetaInfo, encoder.getLength()
- saveLength);
}