Package net.i2p.router.transport.udp

Class PacketBuilder

java.lang.Object

net.i2p.router.transport.udp.PacketBuilder

class PacketBuilder
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	PacketBuilder.Fragment	Class for passing multiple fragments to buildPacket()

Field Summary

Fields

Modifier and Type	Field	Description
static final int	ABSOLUTE_MAX_ACKS	one byte field
static final int	DATA_HEADER_SIZE	not including acks.
static final int	FRAGMENT_HEADER_SIZE	4 byte msg ID + 3 byte fragment info
static final int	HEADER_SIZE	if no extended options or rekey data, which we don't support = 37
static final int	IP_HEADER_SIZE	IPv4 only
static final int	IPV6_HEADER_SIZE
static final int	MIN_DATA_PACKET_OVERHEAD	74
static final int	MIN_IPV6_DATA_PACKET_OVERHEAD	94
(package private) static final int	PRIORITY_HIGH
(package private) static final int	TYPE_ACK
(package private) static final int	TYPE_CONF
(package private) static final int	TYPE_CREAT
(package private) static final int	TYPE_FIRST	For debugging and stats only - does not go out on the wire.
(package private) static final int	TYPE_INTRO
(package private) static final int	TYPE_PUNCH
(package private) static final int	TYPE_RESP
(package private) static final int	TYPE_RREQ
(package private) static final int	TYPE_SREQ
(package private) static final int	TYPE_TBC
(package private) static final int	TYPE_TCB
(package private) static final int	TYPE_TFA
(package private) static final int	TYPE_TTA
static final int	UDP_HEADER_SIZE	Same for IPv4 and IPv6

Constructor Summary

Constructors

Constructor	Description
PacketBuilder()

Method Summary

Modifier and Type	Method	Description
static int	getMaxAdditionalFragmentSize(PeerState peer, int numFragments, int curDataSize)	Will a packet to 'peer' that already has 'numFragments' fragments totalling 'curDataSize' bytes fit another fragment of size 'newFragSize' ?? This doesn't leave anything for acks.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

TYPE_FIRST

static final int TYPE_FIRST

For debugging and stats only - does not go out on the wire. These are chosen to be higher than the highest I2NP message type, as a data packet is set to the underlying I2NP message type.

See Also:

• Constant Field Values

TYPE_ACK

static final int TYPE_ACK

See Also:

• Constant Field Values

TYPE_PUNCH

static final int TYPE_PUNCH

See Also:

• Constant Field Values

TYPE_RESP

static final int TYPE_RESP

See Also:

• Constant Field Values

TYPE_INTRO

static final int TYPE_INTRO

See Also:

• Constant Field Values

TYPE_RREQ

static final int TYPE_RREQ

See Also:

• Constant Field Values

TYPE_TCB

static final int TYPE_TCB

See Also:

• Constant Field Values

TYPE_TBC

static final int TYPE_TBC

See Also:

• Constant Field Values

TYPE_TTA

static final int TYPE_TTA

See Also:

• Constant Field Values

TYPE_TFA

static final int TYPE_TFA

See Also:

• Constant Field Values

TYPE_CONF

static final int TYPE_CONF

See Also:

• Constant Field Values

TYPE_SREQ

static final int TYPE_SREQ

See Also:

• Constant Field Values

TYPE_CREAT

static final int TYPE_CREAT

See Also:

• Constant Field Values

HEADER_SIZE

public static final int HEADER_SIZE

if no extended options or rekey data, which we don't support = 37

See Also:

• Constant Field Values

FRAGMENT_HEADER_SIZE

public static final int FRAGMENT_HEADER_SIZE

4 byte msg ID + 3 byte fragment info

See Also:

• Constant Field Values

DATA_HEADER_SIZE

public static final int DATA_HEADER_SIZE

not including acks. 46

See Also:

• Constant Field Values

IP_HEADER_SIZE

public static final int IP_HEADER_SIZE

IPv4 only

See Also:

• Constant Field Values

UDP_HEADER_SIZE

public static final int UDP_HEADER_SIZE

Same for IPv4 and IPv6

See Also:

• Constant Field Values

MIN_DATA_PACKET_OVERHEAD

public static final int MIN_DATA_PACKET_OVERHEAD

74

See Also:

• Constant Field Values

IPV6_HEADER_SIZE

public static final int IPV6_HEADER_SIZE

See Also:

• Constant Field Values

MIN_IPV6_DATA_PACKET_OVERHEAD

public static final int MIN_IPV6_DATA_PACKET_OVERHEAD

94

See Also:

• Constant Field Values

ABSOLUTE_MAX_ACKS

public static final int ABSOLUTE_MAX_ACKS

one byte field

See Also:

• Constant Field Values

PRIORITY_HIGH

static final int PRIORITY_HIGH

See Also:

• Constant Field Values

Constructor Details

PacketBuilder

PacketBuilder()

Method Details

getMaxAdditionalFragmentSize

public static int getMaxAdditionalFragmentSize(PeerState peer,
 int numFragments,
 int curDataSize)

Will a packet to 'peer' that already has 'numFragments' fragments totalling 'curDataSize' bytes fit another fragment of size 'newFragSize' ?? This doesn't leave anything for acks.

Parameters:

numFragments - >= 1

Since:

0.9.16