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
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;
}
ndn_Error
ndn_decodeTlvSignatureInfo
(struct ndn_Signature *signatureInfo, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t beginOffset;
size_t endOffset;
uint64_t signatureType;
int gotExpectedType;
ndn_Signature_clear(signatureInfo);
beginOffset = decoder->offset;
if ((error = ndn_TlvDecoder_readNestedTlvsStart
(decoder, ndn_Tlv_SignatureInfo, &endOffset)))
return error;
if ((error = ndn_TlvDecoder_readNonNegativeIntegerTlv
(decoder, ndn_Tlv_SignatureType, &signatureType)))
return error;
if (signatureType == ndn_Tlv_SignatureType_SignatureSha256WithRsa ||
signatureType == ndn_Tlv_SignatureType_SignatureSha256WithEcdsa ||
signatureType == ndn_Tlv_SignatureType_SignatureHmacWithSha256) {
// Assume that the ndn_SignatureType enum has the same values as the TLV
// signature types.
signatureInfo->type = signatureType;
if ((error = ndn_decodeTlvKeyLocator
(ndn_Tlv_KeyLocator, &signatureInfo->keyLocator, decoder)))
return error;
if ((error = ndn_TlvDecoder_peekType
(decoder, ndn_Tlv_ValidityPeriod_ValidityPeriod, endOffset,
&gotExpectedType)))
return error;
if (gotExpectedType) {
if ((error = decodeValidityPeriod(&signatureInfo->validityPeriod, decoder)))
return error;
}
}
else if (signatureType == ndn_Tlv_SignatureType_DigestSha256)
signatureInfo->type = ndn_SignatureType_DigestSha256Signature;
else {
signatureInfo->type = ndn_SignatureType_Generic;
signatureInfo->genericTypeCode = signatureType;
// Get the bytes of the SignatureInfo TLV.
if ((error = ndn_TlvDecoder_getSlice
(decoder, beginOffset, endOffset, &signatureInfo->signatureInfoEncoding)))
return error;
}
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
decodeExclude(struct ndn_Exclude *exclude, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
if ((error = ndn_TlvDecoder_readNestedTlvsStart(decoder, ndn_Tlv_Exclude, &endOffset)))
return error;
exclude->nEntries = 0;
while (decoder->offset < endOffset) {
int gotExpectedTag;
if ((error = ndn_TlvDecoder_peekType
(decoder, ndn_Tlv_Any, endOffset, &gotExpectedTag)))
return error;
if (gotExpectedTag) {
// Read past the Any TLV.
int dummyValue;
if ((error = ndn_TlvDecoder_readBooleanTlv
(decoder, ndn_Tlv_Any, endOffset, &dummyValue)))
return error;
if ((error = ndn_Exclude_appendAny(exclude)))
return error;
}
else {
// First append an empty component, then decode into it.
if ((error = ndn_Exclude_appendComponent(exclude, 0, 0)))
return error;
if ((error = ndn_decodeTlvNameComponent
(&exclude->entries[exclude->nEntries - 1].component, decoder)))
return error;
exclude->entries[exclude->nEntries - 1].type = ndn_Exclude_COMPONENT;
}
}
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, endOffset)))
return error;
return NDN_ERROR_success;
}
ndn_Error
ndn_decodeTlvControlResponse
(struct ndn_ControlResponse *controlResponse, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
int gotExpectedType;
uint64_t statusCode;
if ((error = ndn_TlvDecoder_readNestedTlvsStart
(decoder, ndn_Tlv_NfdCommand_ControlResponse, &endOffset)))
return error;
if ((error = ndn_TlvDecoder_readNonNegativeIntegerTlv
(decoder, ndn_Tlv_NfdCommand_StatusCode, &statusCode)))
return error;
controlResponse->statusCode = (int)statusCode;
if ((error = ndn_TlvDecoder_readBlobTlv
(decoder, ndn_Tlv_NfdCommand_StatusText, &controlResponse->statusText)))
return error;
// Decode the body.
if ((error = ndn_TlvDecoder_peekType
(decoder, ndn_Tlv_ControlParameters_ControlParameters, endOffset,
&gotExpectedType)))
return error;
if (gotExpectedType) {
controlResponse->hasBodyAsControlParameters = 1;
if ((error = ndn_decodeTlvControlParameters
(&controlResponse->bodyAsControlParameters, decoder)))
return error;
}
else
controlResponse->hasBodyAsControlParameters = 0;
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;
}
