handle packet metadata about packet headers and trailers More...

#include <packet-metadata.h>

Collaboration diagram for ns3::PacketMetadata:

Classes
struct	Data
class	DataFreeList
struct	ExtraItem
struct	Item
class	ItemIterator
struct	SmallItem

Public Member Functions
	PacketMetadata (uint64_t uid, uint32_t size)
	PacketMetadata (PacketMetadata const &o)
	~PacketMetadata ()
void	AddAtEnd (PacketMetadata const &o)
void	AddHeader (Header const &header, uint32_t size)
void	AddPaddingAtEnd (uint32_t end)
void	AddTrailer (Trailer const &trailer, uint32_t size)
ItemIterator	BeginItem (Buffer buffer) const
PacketMetadata	CreateFragment (uint32_t start, uint32_t end) const
uint32_t	Deserialize (const uint8_t *buffer, uint32_t size)
uint32_t	GetSerializedSize (void) const
uint64_t	GetUid (void) const
PacketMetadata &	operator= (PacketMetadata const &o)
void	RemoveAtEnd (uint32_t end)
void	RemoveAtStart (uint32_t start)
void	RemoveHeader (Header const &header, uint32_t size)
void	RemoveTrailer (Trailer const &trailer, uint32_t size)
uint32_t	Serialize (uint8_t *buffer, uint32_t maxSize) const

Static Public Member Functions
static void	Enable (void)
static void	EnableChecking (void)

Private Member Functions
	PacketMetadata ()
friend	DataFreeList::~DataFreeList ()
uint16_t	AddBig (uint32_t head, uint32_t tail, const PacketMetadata::SmallItem item, const PacketMetadata::ExtraItem extraItem)
uint16_t	AddSmall (const PacketMetadata::SmallItem *item)
void	Append16 (uint16_t value, uint8_t *buffer)
void	Append32 (uint32_t value, uint8_t *buffer)
void	AppendValue (uint32_t value, uint8_t *buffer)
void	AppendValueExtra (uint32_t value, uint8_t *buffer)
void	DoAddHeader (uint32_t uid, uint32_t size)
uint32_t	GetTotalSize (void) const
uint32_t	GetUleb128Size (uint32_t value) const
bool	IsPointerOk (uint16_t pointer) const
bool	IsSharedPointerOk (uint16_t pointer) const
bool	IsStateOk (void) const
uint32_t	ReadItems (uint16_t current, struct PacketMetadata::SmallItem item, struct PacketMetadata::ExtraItem extraItem) const
uint32_t	ReadUleb128 (const uint8_t **pBuffer) const
void	ReplaceTail (PacketMetadata::SmallItem item, PacketMetadata::ExtraItem extraItem, uint32_t available)
void	Reserve (uint32_t n)
void	ReserveCopy (uint32_t n)
void	UpdateHead (uint16_t written)
void	UpdateTail (uint16_t written)

Static Private Member Functions
static uint8_t *	AddToRaw (const uint8_t data, uint32_t dataSize, uint8_t start, uint8_t *current, uint32_t maxSize)
static uint8_t *	AddToRawU16 (const uint16_t &data, uint8_t start, uint8_t current, uint32_t maxSize)
static uint8_t *	AddToRawU32 (const uint32_t &data, uint8_t start, uint8_t current, uint32_t maxSize)
static uint8_t *	AddToRawU64 (const uint64_t &data, uint8_t start, uint8_t current, uint32_t maxSize)
static uint8_t *	AddToRawU8 (const uint8_t &data, uint8_t start, uint8_t current, uint32_t maxSize)
static struct PacketMetadata::Data *	Allocate (uint32_t n)
static struct PacketMetadata::Data *	Create (uint32_t size)
static void	Deallocate (struct PacketMetadata::Data *data)
static uint8_t *	ReadFromRawU16 (uint16_t &data, const uint8_t start, const uint8_t current, uint32_t maxSize)
static uint8_t *	ReadFromRawU32 (uint32_t &data, const uint8_t start, const uint8_t current, uint32_t maxSize)
static uint8_t *	ReadFromRawU64 (uint64_t &data, const uint8_t start, const uint8_t current, uint32_t maxSize)
static uint8_t *	ReadFromRawU8 (uint8_t &data, const uint8_t start, const uint8_t current, uint32_t maxSize)
static void	Recycle (struct PacketMetadata::Data *data)

Private Attributes
struct Data *	m_data
uint16_t	m_head
uint64_t	m_packetUid
uint16_t	m_tail
uint16_t	m_used

Static Private Attributes
static uint16_t	m_chunkUid = 0
static bool	m_enable = false
static bool	m_enableChecking = false
static DataFreeList	m_freeList
static uint32_t	m_maxSize = 0
static bool	m_metadataSkipped = false

Friends
class	ItemIterator

Detailed Description

handle packet metadata about packet headers and trailers

This class is used by the Packet class to record every operation performed on the packet's buffer. This class also provides an implementation of the Packet::Print methods which uses the metadata to analyse the content of the packet's buffer.

To achieve this, this class maintains a linked list of so-called "items", each of which represents a header or a trailer, or payload, or a fragment of any of these. Each item contains a "next" and a "prev" field which point to the next and previous entries in the linked list. The PacketMetadata class maintains a pair of pointers to the head and the tail of the linked list.

Each entry in the list also maintains:

its native size (the size it had when it was first added to the packet)
its type: identifies what kind of header, what kind of trailer, if it is payload or not
the uid of the packet to which it was first added
the start and end of the area represented by a fragment if it is one.

This linked list is flattened in a byte buffer stored in struct PacketMetadata::Data. Each entry of the linked list is identified by an offset which identifies the first byte of the entry from the start of the data buffer. The size of this data buffer is 2^16-1 bytes maximum which somewhat limits the number of entries which can be stored in this linked list but it is quite unlikely to hit this limit in practice.

Each item of the linked list is a variable-sized byte buffer made of a number of fields. Some of these fields are stored as fixed-size 32 bit integers, others as fixed-size 16 bit integers, and some others as variable-size 32-bit integers. The variable-size 32 bit integers are stored using the uleb128 encoding.

Definition at line 79 of file packet-metadata.h.

Constructor & Destructor Documentation

ns3::PacketMetadata::PacketMetadata	(	uint64_t	uid,
		uint32_t	size
	)

inline

Definition at line 366 of file packet-metadata.h.

References DoAddHeader(), ns3::PacketMetadata::Data::m_data, and m_data.

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ns3::PacketMetadata::PacketMetadata ( PacketMetadata const & o )

inline

Definition at line 379 of file packet-metadata.h.

References ns3::PacketMetadata::Data::m_count, m_data, and NS_ASSERT.

ns3::PacketMetadata::~PacketMetadata ( )

inline

Definition at line 412 of file packet-metadata.h.

References ns3::PacketMetadata::Data::m_count, m_data, NS_ASSERT, and Recycle().

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ns3::PacketMetadata::DataFreeList::~DataFreeList ( )

private

ns3::PacketMetadata::PacketMetadata ( )

private

Member Function Documentation

void ns3::PacketMetadata::AddAtEnd ( PacketMetadata const & o )

Definition at line 791 of file packet-metadata.cc.

References AddBig(), ns3::PacketMetadata::SmallItem::chunkUid, IsStateOk(), m_enable, m_head, m_metadataSkipped, m_tail, ns3::PacketMetadata::SmallItem::next, NS_ASSERT, NS_LOG_FUNCTION, ReadItems(), ReplaceTail(), ns3::PacketMetadata::SmallItem::size, ns3::PacketMetadata::SmallItem::typeUid, and UpdateTail().

Referenced by ns3::Packet::AddAtEnd().

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uint16_t ns3::PacketMetadata::AddBig	(	uint32_t	head,
		uint32_t	tail,
		const PacketMetadata::SmallItem *	item,
		const PacketMetadata::ExtraItem *	extraItem
	)

private

Definition at line 390 of file packet-metadata.cc.

Referenced by AddAtEnd(), Deserialize(), RemoveAtEnd(), RemoveAtStart(), and ReplaceTail().

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void ns3::PacketMetadata::AddHeader	(	Header const &	header,
		uint32_t	size
	)

Definition at line 645 of file packet-metadata.cc.

References DoAddHeader(), ns3::ObjectBase::GetInstanceTypeId(), ns3::TypeId::GetUid(), IsStateOk(), and NS_ASSERT.

Referenced by ns3::Packet::AddHeader().

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void ns3::PacketMetadata::AddPaddingAtEnd ( uint32_t end )

Definition at line 869 of file packet-metadata.cc.

References m_enable, and m_metadataSkipped.

Referenced by ns3::Packet::AddPaddingAtEnd().

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uint16_t ns3::PacketMetadata::AddSmall ( const PacketMetadata::SmallItem * item )

inlineprivate

Definition at line 361 of file packet-metadata.cc.

References Append16(), AppendValue(), ns3::PacketMetadata::SmallItem::chunkUid, GetUleb128Size(), ns3::PacketMetadata::Data::m_count, ns3::PacketMetadata::Data::m_data, m_data, ns3::PacketMetadata::Data::m_dirtyEnd, m_head, ns3::PacketMetadata::Data::m_size, m_used, ns3::PacketMetadata::SmallItem::next, NS_ASSERT, NS_LOG_FUNCTION, ns3::PacketMetadata::SmallItem::prev, ReserveCopy(), ns3::PacketMetadata::SmallItem::size, and ns3::PacketMetadata::SmallItem::typeUid.

Referenced by AddTrailer(), and DoAddHeader().

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uint8_t * ns3::PacketMetadata::AddToRaw	(	const uint8_t *	data,
		uint32_t	dataSize,
		uint8_t *	start,
		uint8_t *	current,
		uint32_t	maxSize
	)

staticprivate

Definition at line 1387 of file packet-metadata.cc.

Referenced by Serialize().

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uint8_t * ns3::PacketMetadata::AddToRawU16	(	const uint16_t &	data,
		uint8_t *	start,
		uint8_t *	current,
		uint32_t	maxSize
	)

staticprivate

Definition at line 1342 of file packet-metadata.cc.

Referenced by Serialize().

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uint8_t * ns3::PacketMetadata::AddToRawU32	(	const uint32_t &	data,
		uint8_t *	start,
		uint8_t *	current,
		uint32_t	maxSize
	)

staticprivate

Definition at line 1357 of file packet-metadata.cc.

Referenced by Serialize().

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uint8_t * ns3::PacketMetadata::AddToRawU64	(	const uint64_t &	data,
		uint8_t *	start,
		uint8_t *	current,
		uint32_t	maxSize
	)

staticprivate

Definition at line 1372 of file packet-metadata.cc.

Referenced by Serialize().

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uint8_t * ns3::PacketMetadata::AddToRawU8	(	const uint8_t &	data,
		uint8_t *	start,
		uint8_t *	current,
		uint32_t	maxSize
	)

staticprivate

Definition at line 1327 of file packet-metadata.cc.

Referenced by Serialize().

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void ns3::PacketMetadata::AddTrailer	(	Trailer const &	trailer,
		uint32_t	size
	)

Definition at line 721 of file packet-metadata.cc.

References AddSmall(), ns3::PacketMetadata::SmallItem::chunkUid, ns3::ObjectBase::GetInstanceTypeId(), ns3::TypeId::GetUid(), IsStateOk(), m_chunkUid, m_enable, m_metadataSkipped, m_tail, ns3::PacketMetadata::SmallItem::next, NS_ASSERT, NS_LOG_FUNCTION, ns3::PacketMetadata::SmallItem::prev, ns3::PacketMetadata::SmallItem::size, ns3::PacketMetadata::SmallItem::typeUid, and UpdateTail().

Referenced by ns3::Packet::AddTrailer().

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struct PacketMetadata::Data * ns3::PacketMetadata::Allocate ( uint32_t n )

staticreadprivate

Definition at line 612 of file packet-metadata.cc.

References data, ns3::PacketMetadata::Data::m_count, ns3::PacketMetadata::Data::m_dirtyEnd, ns3::PacketMetadata::Data::m_size, and PACKET_METADATA_DATA_M_DATA_SIZE.

Referenced by Create().

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void ns3::PacketMetadata::Append16	(	uint16_t	value,
		uint8_t *	buffer
	)

inlineprivate

Definition at line 227 of file packet-metadata.cc.

Referenced by AddBig(), AddSmall(), ReplaceTail(), ReserveCopy(), UpdateHead(), and UpdateTail().

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void ns3::PacketMetadata::Append32	(	uint32_t	value,
		uint8_t *	buffer
	)

inlineprivate

Definition at line 234 of file packet-metadata.cc.

Referenced by AddBig(), and ReplaceTail().

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void ns3::PacketMetadata::AppendValue	(	uint32_t	value,
		uint8_t *	buffer
	)

inlineprivate

Definition at line 289 of file packet-metadata.cc.

References AppendValueExtra().

Referenced by AddBig(), AddSmall(), and ReplaceTail().

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void ns3::PacketMetadata::AppendValueExtra	(	uint32_t	value,
		uint8_t *	buffer
	)

private

Definition at line 243 of file packet-metadata.cc.

Referenced by AppendValue().

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PacketMetadata::ItemIterator ns3::PacketMetadata::BeginItem ( Buffer buffer ) const

Definition at line 1033 of file packet-metadata.cc.

References ItemIterator.

Referenced by ns3::Packet::BeginItem(), and ns3::Packet::Print().

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struct PacketMetadata::Data * ns3::PacketMetadata::Create ( uint32_t size )

staticreadprivate

Definition at line 566 of file packet-metadata.cc.

References Allocate(), data, Deallocate(), ns3::PacketMetadata::Data::m_count, m_freeList, m_maxSize, ns3::PacketMetadata::Data::m_size, and NS_LOG_LOGIC.

Referenced by ReserveCopy().

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PacketMetadata ns3::PacketMetadata::CreateFragment	(	uint32_t	start,
		uint32_t	end
	)		const

Parameters

start	the amount of stuff to remove from the start
end	the amount of stuff to remove from the end

Calling this method is equivalent to calling RemoveAtStart (start) and then, RemoveAtEnd (end).

Definition at line 636 of file packet-metadata.cc.

References RemoveAtEnd(), and RemoveAtStart().

Referenced by ns3::Packet::CreateFragment().

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void ns3::PacketMetadata::Deallocate ( struct PacketMetadata::Data * data )

staticprivate

Definition at line 628 of file packet-metadata.cc.

Referenced by Create(), Recycle(), and ns3::PacketMetadata::DataFreeList::~DataFreeList().

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uint32_t ns3::PacketMetadata::Deserialize	(	const uint8_t *	buffer,
		uint32_t	size
	)

Definition at line 1266 of file packet-metadata.cc.

References AddBig(), ns3::PacketMetadata::SmallItem::chunkUid, ns3::PacketMetadata::ExtraItem::fragmentEnd, ns3::PacketMetadata::ExtraItem::fragmentStart, ns3::TypeId::GetUid(), ns3::TypeId::LookupByName(), m_packetUid, m_tail, NS_ASSERT, NS_LOG_FUNCTION, NS_LOG_LOGIC, ns3::PacketMetadata::ExtraItem::packetUid, ReadFromRawU16(), ReadFromRawU32(), ReadFromRawU64(), ReadFromRawU8(), ns3::PacketMetadata::SmallItem::size, visualizer.core::start(), ns3::PacketMetadata::SmallItem::typeUid, and UpdateTail().

Referenced by ns3::Packet::Deserialize().

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void ns3::PacketMetadata::DoAddHeader	(	uint32_t	uid,
		uint32_t	size
	)

private

Definition at line 653 of file packet-metadata.cc.

References AddSmall(), ns3::PacketMetadata::SmallItem::chunkUid, m_chunkUid, m_enable, m_head, m_metadataSkipped, ns3::PacketMetadata::SmallItem::next, NS_LOG_FUNCTION, ns3::PacketMetadata::SmallItem::prev, ns3::PacketMetadata::SmallItem::size, ns3::PacketMetadata::SmallItem::typeUid, and UpdateHead().

Referenced by AddHeader(), and PacketMetadata().

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void ns3::PacketMetadata::Enable ( void )

static

Definition at line 51 of file packet-metadata.cc.

References m_enable, m_metadataSkipped, and NS_ASSERT_MSG.

Referenced by ns3::EpcTftClassifierTestCase::DoRun(), ns3::PacketMetadataTest::DoRun(), EnableChecking(), and ns3::Packet::EnablePrinting().

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void ns3::PacketMetadata::EnableChecking ( void )

static

Definition at line 64 of file packet-metadata.cc.

References Enable(), and m_enableChecking.

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uint32_t ns3::PacketMetadata::GetSerializedSize ( void ) const

Definition at line 1120 of file packet-metadata.cc.

References ns3::TypeId::GetName(), m_enable, m_head, m_tail, ns3::PacketMetadata::SmallItem::next, NS_ASSERT, NS_LOG_FUNCTION, ReadItems(), ns3::TypeId::SetUid(), and ns3::PacketMetadata::SmallItem::typeUid.

Referenced by ns3::Packet::GetSerializedSize(), and ns3::Packet::Serialize().

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uint32_t ns3::PacketMetadata::GetTotalSize ( void ) const

private

Definition at line 1006 of file packet-metadata.cc.

References m_head, m_tail, ns3::PacketMetadata::SmallItem::next, NS_ASSERT, and ReadItems().

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uint64_t ns3::PacketMetadata::GetUid ( void ) const

Definition at line 1028 of file packet-metadata.cc.

References m_packetUid.

Referenced by ns3::Packet::GetUid().

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uint32_t ns3::PacketMetadata::GetUleb128Size ( uint32_t value ) const

inlineprivate

Definition at line 157 of file packet-metadata.cc.

Referenced by AddBig(), AddSmall(), and ReplaceTail().

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bool ns3::PacketMetadata::IsPointerOk ( uint16_t pointer ) const

private

Definition at line 119 of file packet-metadata.cc.

References m_used.

Referenced by IsStateOk().

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bool ns3::PacketMetadata::IsSharedPointerOk ( uint16_t pointer ) const

private

Definition at line 113 of file packet-metadata.cc.

References m_data, and ns3::PacketMetadata::Data::m_size.

Referenced by IsStateOk().

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bool ns3::PacketMetadata::IsStateOk ( void ) const

private

Definition at line 126 of file packet-metadata.cc.

References IsPointerOk(), IsSharedPointerOk(), m_data, m_head, ns3::PacketMetadata::Data::m_size, m_tail, m_used, ns3::PacketMetadata::SmallItem::next, ns3::PacketMetadata::SmallItem::prev, and ReadItems().

Referenced by AddAtEnd(), AddHeader(), AddTrailer(), RemoveAtEnd(), RemoveAtStart(), RemoveHeader(), and RemoveTrailer().

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PacketMetadata & ns3::PacketMetadata::operator= ( PacketMetadata const & o )

inline

Definition at line 391 of file packet-metadata.h.

References ns3::PacketMetadata::Data::m_count, m_data, m_head, m_packetUid, m_tail, m_used, NS_ASSERT, and Recycle().

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uint8_t * ns3::PacketMetadata::ReadFromRawU16	(	uint16_t &	data,
		const uint8_t *	start,
		const uint8_t *	current,
		uint32_t	maxSize
	)

staticprivate

Definition at line 1418 of file packet-metadata.cc.

Referenced by Deserialize().

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uint8_t * ns3::PacketMetadata::ReadFromRawU32	(	uint32_t &	data,
		const uint8_t *	start,
		const uint8_t *	current,
		uint32_t	maxSize
	)

staticprivate

Definition at line 1433 of file packet-metadata.cc.

Referenced by Deserialize().

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uint8_t * ns3::PacketMetadata::ReadFromRawU64	(	uint64_t &	data,
		const uint8_t *	start,
		const uint8_t *	current,
		uint32_t	maxSize
	)

staticprivate

Definition at line 1448 of file packet-metadata.cc.

Referenced by Deserialize().

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uint8_t * ns3::PacketMetadata::ReadFromRawU8	(	uint8_t &	data,
		const uint8_t *	start,
		const uint8_t *	current,
		uint32_t	maxSize
	)

staticprivate

Definition at line 1403 of file packet-metadata.cc.

Referenced by Deserialize().

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uint32_t ns3::PacketMetadata::ReadItems	(	uint16_t	current,
		struct PacketMetadata::SmallItem *	item,
		struct PacketMetadata::ExtraItem *	extraItem
	)		const

private

Parameters

current	the offset we should start reading the data from
item	pointer to where we should store the data to return to the caller
extraItem	pointer to where we should store the data to return to the caller

Returns: the number of bytes read.

Definition at line 526 of file packet-metadata.cc.

References ns3::PacketMetadata::SmallItem::chunkUid, ns3::PacketMetadata::ExtraItem::fragmentEnd, ns3::PacketMetadata::ExtraItem::fragmentStart, ns3::PacketMetadata::Data::m_data, m_data, m_packetUid, ns3::PacketMetadata::Data::m_size, ns3::PacketMetadata::SmallItem::next, NS_ASSERT, NS_LOG_FUNCTION, ns3::PacketMetadata::ExtraItem::packetUid, ns3::PacketMetadata::SmallItem::prev, ReadUleb128(), ns3::PacketMetadata::SmallItem::size, and ns3::PacketMetadata::SmallItem::typeUid.

Referenced by AddAtEnd(), GetSerializedSize(), GetTotalSize(), IsStateOk(), RemoveAtEnd(), RemoveAtStart(), RemoveHeader(), RemoveTrailer(), ReplaceTail(), and Serialize().

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uint32_t ns3::PacketMetadata::ReadUleb128 ( const uint8_t ** pBuffer ) const

private

Definition at line 178 of file packet-metadata.cc.

References NS_ASSERT.

Referenced by ReadItems().

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void ns3::PacketMetadata::Recycle ( struct PacketMetadata::Data * data )

staticprivate

Definition at line 591 of file packet-metadata.cc.

References Deallocate(), ns3::PacketMetadata::Data::m_count, m_enable, m_freeList, m_maxSize, ns3::PacketMetadata::Data::m_size, NS_ASSERT, and NS_LOG_LOGIC.

Referenced by operator=(), ReserveCopy(), and ~PacketMetadata().

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void ns3::PacketMetadata::RemoveAtEnd ( uint32_t end )

Definition at line 941 of file packet-metadata.cc.

References AddBig(), IsStateOk(), m_data, m_enable, m_head, m_metadataSkipped, m_packetUid, m_tail, NS_ASSERT, NS_LOG_FUNCTION, ns3::PacketMetadata::SmallItem::prev, ReadItems(), ns3::PacketMetadata::SmallItem::size, and UpdateHead().

Referenced by CreateFragment(), and ns3::Packet::RemoveAtEnd().

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void ns3::PacketMetadata::RemoveAtStart ( uint32_t start )

Definition at line 878 of file packet-metadata.cc.

References AddBig(), IsStateOk(), m_data, m_enable, m_head, m_metadataSkipped, m_packetUid, m_tail, ns3::PacketMetadata::SmallItem::next, NS_ASSERT, NS_LOG_FUNCTION, ReadItems(), ns3::PacketMetadata::SmallItem::size, visualizer.core::start(), and UpdateTail().

Referenced by CreateFragment(), and ns3::Packet::RemoveAtStart().

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void ns3::PacketMetadata::RemoveHeader	(	Header const &	header,
		uint32_t	size
	)

Definition at line 673 of file packet-metadata.cc.

References ns3::PacketMetadata::ExtraItem::fragmentEnd, ns3::PacketMetadata::ExtraItem::fragmentStart, ns3::ObjectBase::GetInstanceTypeId(), ns3::TypeId::GetUid(), IsStateOk(), m_enable, m_enableChecking, m_head, m_metadataSkipped, m_tail, m_used, ns3::PacketMetadata::SmallItem::next, NS_ASSERT, NS_FATAL_ERROR, NS_LOG_FUNCTION, ReadItems(), ns3::PacketMetadata::SmallItem::size, and ns3::PacketMetadata::SmallItem::typeUid.

Referenced by ns3::Packet::RemoveHeader().

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void ns3::PacketMetadata::RemoveTrailer	(	Trailer const &	trailer,
		uint32_t	size
	)

Definition at line 743 of file packet-metadata.cc.

References ns3::PacketMetadata::ExtraItem::fragmentEnd, ns3::PacketMetadata::ExtraItem::fragmentStart, ns3::ObjectBase::GetInstanceTypeId(), ns3::TypeId::GetUid(), IsStateOk(), m_enable, m_enableChecking, m_head, m_metadataSkipped, m_tail, m_used, NS_ASSERT, NS_FATAL_ERROR, NS_LOG_FUNCTION, ns3::PacketMetadata::SmallItem::prev, ReadItems(), ns3::PacketMetadata::SmallItem::size, and ns3::PacketMetadata::SmallItem::typeUid.

Referenced by ns3::Packet::RemoveTrailer().

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void ns3::PacketMetadata::ReplaceTail	(	PacketMetadata::SmallItem *	item,
		PacketMetadata::ExtraItem *	extraItem,
		uint32_t	available
	)

private

Parameters

item	the item data to write
extraItem	the extra item data to write
available	the number of bytes which can be written without having to rewrite the buffer entirely.

Definition at line 443 of file packet-metadata.cc.