I2NPMessage (I2P Anonymous Network - Java Documentation

All Known Implementing Classes:

DatabaseLookupMessage, DatabaseSearchReplyMessage, DatabaseStoreMessage, DataMessage, DeliveryStatusMessage, FastI2NPMessageImpl, GarlicMessage, I2NPMessageImpl, ShortTunnelBuildMessage, ShortTunnelBuildReplyMessage, TunnelBuildMessage, TunnelBuildMessageBase, TunnelBuildReplyMessage, TunnelDataMessage, TunnelGatewayMessage, UnknownI2NPMessage, VariableTunnelBuildMessage, VariableTunnelBuildReplyMessage
```
public interface I2NPMessage
```
Base interface for all I2NP messages Note: No longer extends DataStructure as of 0.9.48

Author:

jrandom

Field Summary

Fields
Modifier and Type Field and Description

static long MAX_ID_VALUE
4 bytes unsigned

static int MAX_SIZE
Nominal limit, actual max is much less.

Fields
Modifier and Type	Field and Description
`static long`	`MAX_ID_VALUE` 4 bytes unsigned
`static int`	`MAX_SIZE` Nominal limit, actual max is much less.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`long`	`getMessageExpiration()` Date after which the message should be dropped (and the associated uniqueId forgotten)
`int`	`getMessageSize()` How large the message is, including any checksums, i.e.
`int`	`getRawMessageSize()` How large the raw message is with the short 5 byte header
`int`	`getType()` Return the unique identifier for this type of I2NP message, as defined in the I2NP spec
`long`	`getUniqueId()` Replay resistant message ID
`int`	`readBytes(byte[] data, int type, int offset)` Read the body into the data structures, after the initial type byte, using the current class's format as defined by the I2NP specification
`int`	`readBytes(byte[] data, int type, int offset, int maxLen)` Read the body into the data structures, after the initial type byte, using the current class's format as defined by the I2NP specification
`void`	`readMessage(byte[] data, int offset, int dataSize, int type)` Read the body into the data structures, after the initial type byte and the uniqueId / expiration, using the current class's format as defined by the I2NP specification
`void`	`readMessage(byte[] data, int offset, int dataSize, int type, I2NPMessageHandler handler)`
`void`	`setMessageExpiration(long exp)`
`void`	`setUniqueId(long id)`
`byte[]`	`toByteArray()`
`int`	`toByteArray(byte[] buffer)` Write the message to the buffer, returning the new offset (NOT the length).
`int`	`toByteArray(byte[] buffer, int off)` Write the message to the buffer, returning the new offset (NOT the length).
`int`	`toRawByteArray(byte[] buffer)` Write the message to the buffer, returning the new offset (NOT the length).
`int`	`toRawByteArrayNTCP2(byte[] buffer, int off)` Write the message to the buffer, returning the new offset (NOT the length).

- Field Detail
  - MAX_ID_VALUE
```
static final long MAX_ID_VALUE
```
    4 bytes unsigned
    
    See Also:
    
    Constant Field Values
  - MAX_SIZE
```
static final int MAX_SIZE
```
    Nominal limit, actual max is much less. See website docs for further restrictions due to various overhead and limitations in encryption, fragmentation, and the transports.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - readBytes
```
int readBytes(byte[] data,
              int type,
              int offset)
       throws I2NPMessageException
```
    Read the body into the data structures, after the initial type byte, using the current class's format as defined by the I2NP specification
    
    Parameters:
    
    data - the data
    
    type - I2NP message type. If less than zero, read the type from data
    
    offset - where to start starting at type if type is < 0 (16 byte header) starting at ID if type is >= 0 (15 byte header)
    
    Returns:
    
    size of the message read (including headers)
    
    Throws:
    
    I2NPMessageException - if there is no valid message
  - readBytes
```
int readBytes(byte[] data,
              int type,
              int offset,
              int maxLen)
       throws I2NPMessageException
```
    Read the body into the data structures, after the initial type byte, using the current class's format as defined by the I2NP specification
    
    Parameters:
    
    data - the data, may or may not include the type
    
    type - I2NP message type. If less than zero, read the type from data
    
    offset - where to start starting at type if type is < 0 (16 byte header) starting at ID if type is >= 0 (15 byte header)
    
    maxLen - read no more than this many bytes from data starting at offset, even if it is longer This includes the type byte only if type < 0
    
    Returns:
    
    size of the message read (including headers)
    
    Throws:
    
    I2NPMessageException - if there is no valid message
    
    Since:
    
    0.8.12
  - readMessage
```
void readMessage(byte[] data,
                 int offset,
                 int dataSize,
                 int type)
          throws I2NPMessageException
```
    Read the body into the data structures, after the initial type byte and the uniqueId / expiration, using the current class's format as defined by the I2NP specification
    
    Parameters:
    
    data - data to read from
    
    offset - where to start in the data array
    
    dataSize - how long into the data to read
    
    type - I2NP message type
    
    Throws:
    
    I2NPMessageException - if the stream doesn't contain a valid message that this class can read.
  - readMessage
```
void readMessage(byte[] data,
                 int offset,
                 int dataSize,
                 int type,
                 I2NPMessageHandler handler)
          throws I2NPMessageException
```
    Throws:
    
    I2NPMessageException
  - getType
```
int getType()
```
    Return the unique identifier for this type of I2NP message, as defined in the I2NP spec
  - getUniqueId
```
long getUniqueId()
```
    Replay resistant message ID
  - setUniqueId
```
void setUniqueId(long id)
```
  - getMessageExpiration
```
long getMessageExpiration()
```
    Date after which the message should be dropped (and the associated uniqueId forgotten)
  - setMessageExpiration
```
void setMessageExpiration(long exp)
```
  - getMessageSize
```
int getMessageSize()
```
    How large the message is, including any checksums, i.e. full 16 byte header
  - getRawMessageSize
```
int getRawMessageSize()
```
    How large the raw message is with the short 5 byte header
  - toByteArray
```
byte[] toByteArray()
```
    Since:
    
    0.9.48 from DataStructure
  - toByteArray
```
int toByteArray(byte[] buffer)
```
    Write the message to the buffer, returning the new offset (NOT the length). the data is formatted so as to be self contained, with the type, size, expiration, unique id, as well as a checksum bundled along. Full 16 byte header for NTCP 1.
    
    Returns:
    
    the new offset (NOT the length)
  - toByteArray
```
int toByteArray(byte[] buffer,
                int off)
```
    Write the message to the buffer, returning the new offset (NOT the length). the data is formatted so as to be self contained, with the type, size, expiration, unique id, as well as a checksum bundled along. Full 16 byte header for NTCP 1.
    
    Parameters:
    
    off - the offset to start writing at
    
    Returns:
    
    the new offset (NOT the length)
    
    Since:
    
    0.9.36
  - toRawByteArray
```
int toRawByteArray(byte[] buffer)
```
    Write the message to the buffer, returning the new offset (NOT the length). the data is is not self contained - it does not include the size, unique id, or any checksum, but does include the type and expiration. Short 5 byte header for SSU.
    
    Returns:
    
    the length written
  - toRawByteArrayNTCP2
```
int toRawByteArrayNTCP2(byte[] buffer,
                        int off)
```
    Write the message to the buffer, returning the new offset (NOT the length). the data is is not self contained - it does not include the size, unique id, or any checksum, but does include the type and expiration. Short 9 byte header for NTCP 2.
    
    Parameters:
    
    off - the offset to start writing at
    
    Returns:
    
    the new offset (NOT the length)
    
    Since:
    
    0.9.36

Interface I2NPMessage

Field Summary

Method Summary

Field Detail

MAX_ID_VALUE

MAX_SIZE

Method Detail

readBytes

readBytes

readMessage

readMessage

getType

getUniqueId

setUniqueId

getMessageExpiration

setMessageExpiration

getMessageSize

getRawMessageSize

toByteArray

toByteArray

toByteArray

toRawByteArray

toRawByteArrayNTCP2