ndn::Data Class Reference

Represents a Data packet. More...

#include <data.hpp>

Inheritance diagram for ndn::Data:

Collaboration diagram for ndn::Data:

Classes
class	Error

Public Member Functions
	Data (const Name &name=Name())
	Construct an unsigned Data packet with given name and empty Content. More...
	Data (const Block &wire)
	Construct a Data packet by decoding from wire. More...
uint64_t	getCongestionMark () const
	get the value of the CongestionMark tag More...
const Block &	getContent () const
	Get Content. More...
uint32_t	getContentType () const
const optional< name::Component > &	getFinalBlock () const
name::Component	getFinalBlockId () const
time::milliseconds	getFreshnessPeriod () const
const Name &	getFullName () const
	Get full name including implicit digest. More...
const MetaInfo &	getMetaInfo () const
	Get MetaInfo. More...
const Name &	getName () const
	Get name. More...
const Signature &	getSignature () const
	Get Signature. More...
template<typename T >
shared_ptr< T >	getTag () const
	get a tag item More...
bool	hasWire () const
	Check if this instance has cached wire encoding. More...
template<typename T >
void	removeTag () const
	remove tag item More...
void	setCongestionMark (uint64_t mark)
	set the CongestionMark tag to the specified value More...
Data &	setContent (const Block &block)
	Set Content from a block. More...
Data &	setContent (const uint8_t *value, size_t valueSize)
	Copy Content value from raw buffer. More...
Data &	setContent (const ConstBufferPtr &value)
	Set Content from wire buffer. More...
Data &	setContentType (uint32_t type)
Data &	setFinalBlock (optional< name::Component > finalBlockId)
Data &	setFinalBlockId (const name::Component &finalBlockId)
Data &	setFreshnessPeriod (time::milliseconds freshnessPeriod)
Data &	setMetaInfo (const MetaInfo &metaInfo)
	Set MetaInfo. More...
Data &	setName (const Name &name)
	Set name. More...
Data &	setSignature (const Signature &signature)
	Set Signature. More...
Data &	setSignatureValue (const Block &value)
	Set SignatureValue. More...
template<typename T >
void	setTag (shared_ptr< T > tag) const
	set a tag item More...
void	wireDecode (const Block &wire)
	Decode from wire in NDN Packet Format v0.2 or v0.3. More...
template<encoding::Tag TAG>
size_t	wireEncode (EncodingImpl< TAG > &encoder, bool wantUnsignedPortionOnly=false) const
	Prepend wire encoding to encoder in NDN Packet Format v0.2. More...
const Block &	wireEncode (EncodingBuffer &encoder, const Block &signatureValue) const
	Finalize Data packet encoding with the specified SignatureValue. More...
const Block &	wireEncode () const
	Encode to a Block. More...

Protected Member Functions
void	resetWire ()
	Clear wire encoding and cached FullName. More...

Detailed Description

Represents a Data packet.

Definition at line 35 of file data.hpp.

Constructor & Destructor Documentation

ndn::Data::Data ( const Name &  name = Name() )

explicit

Construct an unsigned Data packet with given name and empty Content.

Warning

In certain contexts that use Data::shared_from_this(), Data must be created using make_shared. Otherwise, shared_from_this() will trigger undefined behavior.

Definition at line 35 of file data.cpp.

ndn::Data::Data ( const Block &  wire )

explicit

Construct a Data packet by decoding from wire.

Parameters

wire	tlv::Data element as defined in NDN Packet Format v0.2 or v0.3. It may be signed or unsigned.

Warning

In certain contexts that use Data::shared_from_this(), Data must be created using make_shared. Otherwise, shared_from_this() will trigger undefined behavior.

Definition at line 41 of file data.cpp.

Member Function Documentation

uint64_t ndn::PacketBase::getCongestionMark ( ) const

inherited

get the value of the CongestionMark tag

Definition at line 28 of file packet-base.cpp.

const Block & ndn::Data::getContent

(

)

const

Get Content.

The Content value is accessible through value()/value_size() or value_begin()/value_end() methods of the Block class.

Definition at line 234 of file data.cpp.

uint32_t ndn::Data::getContentType ( ) const

inline

Definition at line 208 of file data.hpp.

const optional<name::Component>& ndn::Data::getFinalBlock ( ) const

inline

Definition at line 226 of file data.hpp.

name::Component ndn::Data::getFinalBlockId

(

)

const

Deprecated:

Use getFinalBlock

See also

MetaInfo::getFinalBlockId

Definition at line 314 of file data.cpp.

time::milliseconds ndn::Data::getFreshnessPeriod ( ) const

inline

Definition at line 217 of file data.hpp.

const Name & ndn::Data::getFullName

(

)

const

Get full name including implicit digest.

Precondition

hasWire() == true; i.e. wireEncode() must have been called

Exceptions

Error

Data has no wire encoding

Definition at line 197 of file data.cpp.

const MetaInfo& ndn::Data::getMetaInfo ( ) const

inline

Get MetaInfo.

Definition at line 142 of file data.hpp.

const Name& ndn::Data::getName ( ) const

inline

Get name.

Definition at line 128 of file data.hpp.

const Signature& ndn::Data::getSignature ( ) const

inline

Get Signature.

Definition at line 189 of file data.hpp.

template<typename T >

shared_ptr< T > ndn::TagHost::getTag ( ) const

inlineinherited

get a tag item

Template Parameters

T	type of the tag, which must be a subclass of ndn::Tag

Return values

nullptr

if no Tag of type T is stored

Definition at line 67 of file tag-host.hpp.

bool ndn::Data::hasWire ( ) const

inline

Check if this instance has cached wire encoding.

Definition at line 112 of file data.hpp.

template<typename T >

void ndn::TagHost::removeTag ( ) const

inlineinherited

remove tag item

Note

Tag can be removed even on a const tag host instance

Definition at line 94 of file tag-host.hpp.

void ndn::Data::resetWire ( )

protected

Clear wire encoding and cached FullName.

Note

This does not clear the SignatureValue.

Definition at line 211 of file data.cpp.

void ndn::PacketBase::setCongestionMark ( uint64_t  mark )

inherited

set the CongestionMark tag to the specified value

Definition at line 41 of file packet-base.cpp.

Data & ndn::Data::setContent

(

const Block &

block

)

Set Content from a block.

If block's TLV-TYPE is Content, it will be used directly as Data's Content element. If block's TLV-TYPE is not Content, it will be nested into a Content element.

Returns

a reference to this Data, to allow chaining

Definition at line 243 of file data.cpp.

Data & ndn::Data::setContent	(	const uint8_t *	value,
		size_t	valueSize
	)

Copy Content value from raw buffer.

Parameters

value	pointer to the first octet of the value
valueSize	size of the raw buffer

Returns

a reference to this Data, to allow chaining

Definition at line 258 of file data.cpp.

Data & ndn::Data::setContent

(

const ConstBufferPtr &

value

)

Set Content from wire buffer.

Parameters

value

Content value, which does not need to be a TLV element

Returns

a reference to this Data, to allow chaining

Definition at line 266 of file data.cpp.

Data & ndn::Data::setContentType

(

uint32_t

type

)

Definition at line 290 of file data.cpp.

Data & ndn::Data::setFinalBlock

(

optional< name::Component >

finalBlockId

)

Definition at line 306 of file data.cpp.

Data & ndn::Data::setFinalBlockId

(

const name::Component &

finalBlockId

)

Deprecated:

Use setFinalBlock

See also

MetaInfo::setFinalBlockId

Definition at line 320 of file data.cpp.

Data & ndn::Data::setFreshnessPeriod

(

time::milliseconds

freshnessPeriod

)

Definition at line 298 of file data.cpp.

Data & ndn::Data::setMetaInfo

(

const MetaInfo &

metaInfo

)

Set MetaInfo.

Returns

a reference to this Data, to allow chaining

Definition at line 226 of file data.cpp.

Data & ndn::Data::setName

(

const Name &

name

)

Set name.

Returns

a reference to this Data, to allow chaining

Definition at line 218 of file data.cpp.

Data & ndn::Data::setSignature

(

const Signature &

signature

)

Set Signature.

Returns

a reference to this Data, to allow chaining

Definition at line 274 of file data.cpp.

Data & ndn::Data::setSignatureValue

(

const Block &

value

)

Set SignatureValue.

Returns

a reference to this Data, to allow chaining

Definition at line 282 of file data.cpp.

template<typename T >

void ndn::TagHost::setTag ( shared_ptr< T >  tag ) const

inlineinherited

set a tag item

Template Parameters

T	type of the tag, which must be a subclass of ndn::Tag

Note

Tag can be set even on a const tag host instance

Definition at line 80 of file tag-host.hpp.

void ndn::Data::wireDecode

(

const Block &

wire

)

Decode from wire in NDN Packet Format v0.2 or v0.3.

Definition at line 122 of file data.cpp.

template<encoding::Tag TAG>

size_t ndn::Data::wireEncode	(	EncodingImpl< TAG > &	encoder,
		bool	wantUnsignedPortionOnly = false
	)		const

Prepend wire encoding to encoder in NDN Packet Format v0.2.

Parameters

encoder	EncodingEstimator or EncodingBuffer instance
wantUnsignedPortionOnly	If true, only prepends Name, MetaInfo, Content, and SignatureInfo to encoder, but omit SignatureValue and outmost Type-Length of Data element. This is intended to be used with wireEncode(encoder, signatureValue).

Exceptions

Error

SignatureBits are not provided and wantUnsignedPortionOnly is false.

Definition at line 48 of file data.cpp.

const Block & ndn::Data::wireEncode	(	EncodingBuffer &	encoder,
		const Block &	signatureValue
	)		const

Finalize Data packet encoding with the specified SignatureValue.

Parameters

encoder	EncodingBuffer containing Name, MetaInfo, Content, and SignatureInfo, but without SignatureValue or outmost Type-Length of Data element
signatureValue	SignatureValue element

This method is intended to be used in concert with Data::wireEncode(encoder, true)

Data data;
...
EncodingBuffer encoder;
data.wireEncode(encoder, true);
...
Block signatureValue = <sign_over_unsigned_portion>(encoder.buf(), encoder.size());
data.wireEncode(encoder, signatureValue)

Definition at line 93 of file data.cpp.

const Block & ndn::Data::wireEncode

(

)

const

Encode to a Block.

Precondition

Data is signed.

Normally, this function encodes to NDN Packet Format v0.2. However, if this instance has cached wire encoding (hasWire() is true), the cached encoding is returned and it might be in v0.3 format.

Definition at line 106 of file data.cpp.