ndn_Error
ndn_decodeTlvData
(struct ndn_Data *data, size_t *signedPortionBeginOffset, size_t *signedPortionEndOffset, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
size_t dummyBeginOffset, dummyEndOffset;
if ((error = ndn_TlvDecoder_readNestedTlvsStart(decoder, ndn_Tlv_Data, &endOffset)))
return error;
*signedPortionBeginOffset = decoder->offset;
if ((error = ndn_decodeTlvName
(&data->name, &dummyBeginOffset, &dummyEndOffset, decoder)))
return error;
if ((error = decodeMetaInfo(&data->metaInfo, decoder)))
return error;
if ((error = ndn_TlvDecoder_readBlobTlv(decoder, ndn_Tlv_Content, &data->content)))
return error;
if ((error = ndn_decodeTlvSignatureInfo(&data->signature, decoder)))
return error;
*signedPortionEndOffset = decoder->offset;
if ((error = ndn_TlvDecoder_readBlobTlv(decoder, ndn_Tlv_SignatureValue, &data->signature.signature)))
return error;
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, endOffset)))
return error;
return NDN_ERROR_success;
}
ndn_Error
ndn_decodeTlvNameComponent
(struct ndn_NameComponent *component, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
uint64_t type;
size_t saveOffset;
saveOffset = decoder->offset;
if ((error = ndn_TlvDecoder_readVarNumber(decoder, &type)))
return error;
// Restore the position.
ndn_TlvDecoder_seek(decoder, saveOffset);
if ((error = ndn_TlvDecoder_readBlobTlv(decoder, type, &component->value)))
return error;
if (type == ndn_Tlv_ImplicitSha256DigestComponent)
component->type = ndn_NameComponentType_IMPLICIT_SHA256_DIGEST;
else if (type == ndn_Tlv_ParametersSha256DigestComponent)
component->type = ndn_NameComponentType_PARAMETERS_SHA256_DIGEST;
else if (type == ndn_Tlv_NameComponent)
component->type = ndn_NameComponentType_GENERIC;
else {
// Unrecognized type code.
component->type = ndn_NameComponentType_OTHER_CODE;
component->otherTypeCode = (int)type;
}
return NDN_ERROR_success;
}
ndn_Error
ndn_decodeTlvName
(struct ndn_Name *name, size_t *signedPortionBeginOffset,
size_t *signedPortionEndOffset, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
if ((error = ndn_TlvDecoder_readNestedTlvsStart(decoder, ndn_Tlv_Name, &endOffset)))
return error;
*signedPortionBeginOffset = decoder->offset;
// In case there are no components, set signedPortionEndOffset arbitrarily.
*signedPortionEndOffset = *signedPortionBeginOffset;
name->nComponents = 0;
while (decoder->offset < endOffset) {
struct ndn_Blob component;
*signedPortionEndOffset = decoder->offset;
if ((error = ndn_TlvDecoder_readBlobTlv(decoder, ndn_Tlv_NameComponent, &component)))
return error;
if ((error = ndn_Name_appendBlob(name, &component)))
return error;
}
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, endOffset)))
return error;
return NDN_ERROR_success;
}
static ndn_Error
decodeValidityPeriod
(struct ndn_ValidityPeriod *validityPeriod, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
// Expect a 15-character ISO string like "20131018T184139".
const size_t isoStringMaxLength = 15;
char isoString[isoStringMaxLength + 1];
struct ndn_Blob isoStringBlob;
if ((error = ndn_TlvDecoder_readNestedTlvsStart
(decoder, ndn_Tlv_ValidityPeriod_ValidityPeriod, &endOffset)))
return error;
ndn_ValidityPeriod_clear(validityPeriod);
// Decode notBefore as an ISO string.
if ((error = ndn_TlvDecoder_readBlobTlv
(decoder, ndn_Tlv_ValidityPeriod_NotBefore, &isoStringBlob)))
return error;
if (isoStringBlob.length > isoStringMaxLength)
return NDN_ERROR_Calendar_time_value_out_of_range;
ndn_memcpy((uint8_t *)isoString, isoStringBlob.value, isoStringBlob.length);
isoString[isoStringBlob.length] = 0;
if ((error = ndn_fromIsoString(isoString, &validityPeriod->notBefore)))
return error;
// Decode notAfter as an ISO string.
if ((error = ndn_TlvDecoder_readBlobTlv
(decoder, ndn_Tlv_ValidityPeriod_NotAfter, &isoStringBlob)))
return error;
if (isoStringBlob.length > isoStringMaxLength)
return NDN_ERROR_Calendar_time_value_out_of_range;
ndn_memcpy((uint8_t *)isoString, isoStringBlob.value, isoStringBlob.length);
isoString[isoStringBlob.length] = 0;
if ((error = ndn_fromIsoString(isoString, &validityPeriod->notAfter)))
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;
// 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;
}
ndn_Error
ndn_Tlv0_2WireFormat_decodeSignatureInfoAndValue
(struct ndn_Signature *signature, const uint8_t *signatureInfo,
size_t signatureInfoLength, const uint8_t *signatureValue,
size_t signatureValueLength)
{
ndn_Error error;
struct ndn_TlvDecoder decoder;
ndn_TlvDecoder_initialize(&decoder, signatureInfo, signatureInfoLength);
if ((error = ndn_decodeTlvSignatureInfo(signature, &decoder)))
return error;
ndn_TlvDecoder_initialize(&decoder, signatureValue, signatureValueLength);
return ndn_TlvDecoder_readBlobTlv
(&decoder, ndn_Tlv_SignatureValue, &signature->signature);
}
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;
}
ndn_Error
ndn_decodeTlvNameComponent
(struct ndn_NameComponent *component, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
uint64_t type;
size_t saveOffset;
saveOffset = decoder->offset;
if ((error = ndn_TlvDecoder_readVarNumber(decoder, &type)))
return error;
// Restore the position.
ndn_TlvDecoder_seek(decoder, saveOffset);
if ((error = ndn_TlvDecoder_readBlobTlv(decoder, type, &component->value)))
return error;
if (type == ndn_Tlv_ImplicitSha256DigestComponent)
component->type = ndn_NameComponentType_IMPLICIT_SHA256_DIGEST;
else
component->type = ndn_NameComponentType_GENERIC;
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;
}
