static ndn_Error
decodeMetaInfo(struct ndn_MetaInfo *metaInfo, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
int gotExpectedType;
if ((error = ndn_TlvDecoder_readNestedTlvsStart(decoder, ndn_Tlv_MetaInfo, &endOffset)))
return error;
int type;
if ((error = ndn_TlvDecoder_readOptionalNonNegativeIntegerTlv
(decoder, ndn_Tlv_ContentType, endOffset, &type)))
return error;
if (type < 0 || type == ndn_ContentType_BLOB)
// Default to BLOB if the value is omitted.
metaInfo->type = ndn_ContentType_BLOB;
else if (type == ndn_ContentType_LINK ||
type == ndn_ContentType_KEY ||
type == ndn_ContentType_NACK)
// The ContentType enum is set up with the correct integer for each NDN-TLV ContentType.
metaInfo->type = type;
else {
// Unrecognized content type.
metaInfo->type = ndn_ContentType_OTHER_CODE;
metaInfo->otherTypeCode = type;
}
if ((error = ndn_TlvDecoder_readOptionalNonNegativeIntegerTlvAsDouble
(decoder, ndn_Tlv_FreshnessPeriod, endOffset, &metaInfo->freshnessPeriod)))
return error;
if ((error = ndn_TlvDecoder_peekType
(decoder, ndn_Tlv_FinalBlockId, endOffset, &gotExpectedType)))
return error;
if (gotExpectedType) {
size_t finalBlockIdEndOffset;
if ((error = ndn_TlvDecoder_readNestedTlvsStart
(decoder, ndn_Tlv_FinalBlockId, &finalBlockIdEndOffset)))
return error;
if ((error = ndn_decodeTlvNameComponent(&metaInfo->finalBlockId, decoder)))
return error;
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, finalBlockIdEndOffset)))
return error;
}
else
ndn_NameComponent_initialize(&metaInfo->finalBlockId, 0, 0);
// Set fields not used by NDN-TLV to none.
metaInfo->timestampMilliseconds = -1;
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, endOffset)))
return error;
return NDN_ERROR_success;
}
static ndn_Error
decodeMetaInfo(struct ndn_MetaInfo *metaInfo, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
int gotExpectedType;
if ((error = ndn_TlvDecoder_readNestedTlvsStart(decoder, ndn_Tlv_MetaInfo, &endOffset)))
return error;
// The ContentType enum is set up with the correct integer for each NDN-TLV ContentType.
if ((error = ndn_TlvDecoder_readOptionalNonNegativeIntegerTlv
(decoder, ndn_Tlv_ContentType, endOffset, (int *)&metaInfo->type)))
return error;
if ((int)metaInfo->type < 0)
// Set to the actual value for the default.
metaInfo->type = ndn_ContentType_BLOB;
if ((error = ndn_TlvDecoder_readOptionalNonNegativeIntegerTlvAsDouble
(decoder, ndn_Tlv_FreshnessPeriod, endOffset, &metaInfo->freshnessPeriod)))
return error;
if ((error = ndn_TlvDecoder_peekType
(decoder, ndn_Tlv_FinalBlockId, endOffset, &gotExpectedType)))
return error;
if (gotExpectedType) {
size_t finalBlockIdEndOffset;
if ((error = ndn_TlvDecoder_readNestedTlvsStart
(decoder, ndn_Tlv_FinalBlockId, &finalBlockIdEndOffset)))
return error;
if ((error = ndn_TlvDecoder_readBlobTlv
(decoder, ndn_Tlv_NameComponent, &metaInfo->finalBlockId.value)))
return error;
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, finalBlockIdEndOffset)))
return error;
}
else
ndn_NameComponent_initialize(&metaInfo->finalBlockId, 0, 0);
// Set fields not used by NDN-TLV to none.
metaInfo->timestampMilliseconds = -1;
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;
}
