static ndn_Error
decodeSelectors(struct ndn_Interest *interest, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
int gotExpectedType;
if ((error = ndn_TlvDecoder_readNestedTlvsStart(decoder, ndn_Tlv_Selectors, &endOffset)))
return error;
if ((error = ndn_TlvDecoder_readOptionalNonNegativeIntegerTlv
(decoder, ndn_Tlv_MinSuffixComponents, endOffset, &interest->minSuffixComponents)))
return error;
if ((error = ndn_TlvDecoder_readOptionalNonNegativeIntegerTlv
(decoder, ndn_Tlv_MaxSuffixComponents, endOffset, &interest->maxSuffixComponents)))
return error;
if ((error = ndn_TlvDecoder_peekType
(decoder, ndn_Tlv_PublisherPublicKeyLocator, endOffset, &gotExpectedType)))
return error;
if (gotExpectedType) {
if ((error = ndn_decodeTlvKeyLocator
(ndn_Tlv_PublisherPublicKeyLocator, &interest->keyLocator, decoder)))
return error;
}
else
// Clear the key locator.
ndn_KeyLocator_initialize(&interest->keyLocator, interest->keyLocator.keyName.components, interest->keyLocator.keyName.maxComponents);
if ((error = ndn_TlvDecoder_peekType(decoder, ndn_Tlv_Exclude, endOffset, &gotExpectedType)))
return error;
if (gotExpectedType) {
if ((error = decodeExclude(&interest->exclude, decoder)))
return error;
}
else
interest->exclude.nEntries = 0;
if ((error = ndn_TlvDecoder_readOptionalNonNegativeIntegerTlv
(decoder, ndn_Tlv_ChildSelector, endOffset, &interest->childSelector)))
return error;
if ((error = ndn_TlvDecoder_readBooleanTlv
(decoder, ndn_Tlv_MustBeFresh, endOffset, &interest->mustBeFresh)))
return error;
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, endOffset)))
return error;
return NDN_ERROR_success;
}
ndn_Error
ndn_decodeTlvKeyLocator
(unsigned int expectedType, struct ndn_KeyLocator *keyLocator,
struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
int gotExpectedType;
if ((error = ndn_TlvDecoder_readNestedTlvsStart(decoder, expectedType, &endOffset)))
return error;
ndn_KeyLocator_initialize
(keyLocator, keyLocator->keyName.components, keyLocator->keyName.maxComponents);
if (decoder->offset == endOffset)
// The KeyLocator is omitted, so leave the fields as none.
return NDN_ERROR_success;
if ((error = ndn_TlvDecoder_peekType(decoder, ndn_Tlv_Name, endOffset, &gotExpectedType)))
return error;
if (gotExpectedType) {
size_t dummyBeginOffset, dummyEndOffset;
// KeyLocator is a Name.
if ((error = ndn_decodeTlvName
(&keyLocator->keyName, &dummyBeginOffset, &dummyEndOffset, decoder)))
return error;
keyLocator->type = ndn_KeyLocatorType_KEYNAME;
}
else {
if ((error = ndn_TlvDecoder_peekType(decoder, ndn_Tlv_KeyLocatorDigest, endOffset, &gotExpectedType)))
return error;
if (gotExpectedType) {
// KeyLocator is a KeyLocatorDigest.
keyLocator->type = ndn_KeyLocatorType_KEY_LOCATOR_DIGEST;
if ((error = ndn_TlvDecoder_readBlobTlv(decoder, ndn_Tlv_KeyLocatorDigest, &keyLocator->keyData)))
return error;
}
else
return NDN_ERROR_decodeKeyLocator_unrecognized_key_locator_type;
}
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, endOffset)))
return error;
return NDN_ERROR_success;
}
static ndn_Error
ndn_decodeTlvInterestV03
(struct ndn_Interest *interest, size_t *signedPortionBeginOffset,
size_t *signedPortionEndOffset, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
int canBePrefix, mustBeFresh;
struct ndn_Blob dummyBlob;
if ((error = ndn_TlvDecoder_readNestedTlvsStart
(decoder, ndn_Tlv_Interest, &endOffset)))
return error;
if ((error = ndn_decodeTlvName
(&interest->name, signedPortionBeginOffset, signedPortionEndOffset,
decoder)))
return error;
if ((error = ndn_TlvDecoder_readBooleanTlv
(decoder, ndn_Tlv_CanBePrefix, endOffset, &canBePrefix)))
return error;
ndn_Interest_setCanBePrefix(interest, canBePrefix);
if ((error = ndn_TlvDecoder_readBooleanTlv
(decoder, ndn_Tlv_MustBeFresh, endOffset, &mustBeFresh)))
return error;
ndn_Interest_setMustBeFresh(interest, mustBeFresh);
// Get the encoded sequence of delegations as is.
if ((error = ndn_TlvDecoder_readOptionalBlobTlv
(decoder, ndn_Tlv_ForwardingHint, endOffset,
&interest->forwardingHintWireEncoding)))
return error;
if ((error = ndn_TlvDecoder_readOptionalBlobTlv
(decoder, ndn_Tlv_Nonce, endOffset, &interest->nonce)))
return error;
if ((error = ndn_TlvDecoder_readOptionalNonNegativeIntegerTlvAsDouble
(decoder, ndn_Tlv_InterestLifetime, endOffset, &interest->interestLifetimeMilliseconds)))
return error;
// Clear the unused fields.
interest->minSuffixComponents = -1;
ndn_KeyLocator_initialize
(&interest->keyLocator, interest->keyLocator.keyName.components,
interest->keyLocator.keyName.maxComponents);
interest->exclude.nEntries = 0;
interest->childSelector = -1;
ndn_Blob_initialize(&interest->linkWireEncoding, 0, 0);
interest->selectedDelegationIndex = -1;
// Ignore the HopLimit and Parameters.
if ((error = ndn_TlvDecoder_readOptionalBlobTlv
(decoder, ndn_Tlv_HopLimit, endOffset, &dummyBlob)))
return error;
if ((error = ndn_TlvDecoder_readOptionalBlobTlv
(decoder, ndn_Tlv_Parameters, endOffset, &dummyBlob)))
return error;
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, endOffset)))
return error;
return NDN_ERROR_success;
}
static ndn_Error
ndn_decodeTlvInterestV02
(struct ndn_Interest *interest, size_t *signedPortionBeginOffset,
size_t *signedPortionEndOffset, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
int gotExpectedType;
if ((error = ndn_TlvDecoder_readNestedTlvsStart(decoder, ndn_Tlv_Interest, &endOffset)))
return error;
if ((error = ndn_decodeTlvName
(&interest->name, signedPortionBeginOffset, signedPortionEndOffset,
decoder)))
return error;
if ((error = ndn_TlvDecoder_peekType(decoder, ndn_Tlv_Selectors, endOffset, &gotExpectedType)))
return error;
if (gotExpectedType) {
if ((error = decodeSelectors(interest, decoder)))
return error;
}
else {
// Set selectors to none.
interest->minSuffixComponents = -1;
interest->maxSuffixComponents = -1;
ndn_KeyLocator_initialize
(&interest->keyLocator, interest->keyLocator.keyName.components,
interest->keyLocator.keyName.maxComponents);
interest->exclude.nEntries = 0;
interest->childSelector = -1;
interest->mustBeFresh = 0;
}
// Require a Nonce, but don't force it to be 4 bytes.
if ((error = ndn_TlvDecoder_readBlobTlv(decoder, ndn_Tlv_Nonce, &interest->nonce)))
return error;
if ((error = ndn_TlvDecoder_readOptionalNonNegativeIntegerTlvAsDouble
(decoder, ndn_Tlv_InterestLifetime, endOffset, &interest->interestLifetimeMilliseconds)))
return error;
// Get the encoded sequence of delegations as is.
if ((error = ndn_TlvDecoder_readOptionalBlobTlv
(decoder, ndn_Tlv_ForwardingHint, endOffset,
&interest->forwardingHintWireEncoding)))
return error;
if ((error = ndn_TlvDecoder_peekType(decoder, ndn_Tlv_Data, endOffset, &gotExpectedType)))
return error;
if (gotExpectedType) {
// Get the bytes of the Link TLV.
size_t linkBeginOffset = decoder->offset;
size_t linkEndOffset;
if ((error = ndn_TlvDecoder_readNestedTlvsStart
(decoder, ndn_Tlv_Data, &linkEndOffset)))
return error;
ndn_TlvDecoder_seek(decoder, linkEndOffset);
if ((error = ndn_TlvDecoder_getSlice
(decoder, linkBeginOffset, linkEndOffset, &interest->linkWireEncoding)))
return error;
}
else
ndn_Blob_initialize(&interest->linkWireEncoding, 0, 0);
if ((error = ndn_TlvDecoder_readOptionalNonNegativeIntegerTlv
(decoder, ndn_Tlv_SelectedDelegation, endOffset,
&interest->selectedDelegationIndex)))
return error;
if (interest->selectedDelegationIndex >= 0 && !interest->linkWireEncoding.value)
return NDN_ERROR_Interest_has_a_selected_delegation_but_no_link_object;
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, endOffset)))
return error;
return NDN_ERROR_success;
}
