com.maverick.ssh.compression

Interface SshCompression

All Superinterfaces:

SecureComponent, SshComponent

All Known Implementing Classes:

NoneCompression, OpenSSHZLibCompression, ZLibCompression

public interface SshCompression
extends SshComponent, SecureComponent

Compression interface which can be implemented to provide the SSH Transport Protocol with compression.

Author:

Lee David Painter

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFLATER Deflation mode
static int	INFLATER Inflation mode

Method Summary

Modifier and Type	Method and Description
byte[]	compress(byte[] data, int start, int len) Compress a block of data.
String	getAlgorithm() Get the algorithm name for this compression implementation.
void	init(int type, int level) Initialize the compression.
boolean	isDelayed() Is this compression delayed until after authentication
byte[]	uncompress(byte[] data, int start, int len) Uncompress a block of data.

Methods inherited from interface com.maverick.ssh.SecureComponent

getPriority, getSecurityLevel

Field Detail

INFLATER

static final int INFLATER

Inflation mode

See Also:

Constant Field Values

DEFLATER

static final int DEFLATER

Deflation mode

See Also:

Constant Field Values

Method Detail

init

void init(int type,
          int level)

Initialize the compression.

Parameters:

type - the mode of the compression, should be either INFLATER or DEFLATER

level - the level of compression

isDelayed

boolean isDelayed()

Is this compression delayed until after authentication

Returns:

compress

byte[] compress(byte[] data,
                int start,
                int len)
         throws IOException

Compress a block of data.

Parameters:

data - the data to compress

start - the offset of the data to compress

len - the length of the data

Returns:

the compressed data with any uncompressed data at the start remaining intact.

Throws:

IOException

uncompress

byte[] uncompress(byte[] data,
                  int start,
                  int len)
           throws IOException

Uncompress a block of data.

Parameters:

data - the data to uncompress

start - the offset of the data to uncompress

len - the length of the data

Returns:

the uncompressed data with any data not compressed at the start remaining intact.

Throws:

IOException

getAlgorithm

String getAlgorithm()

Get the algorithm name for this compression implementation.

Specified by:

getAlgorithm in interface SecureComponent

Specified by:

getAlgorithm in interface SshComponent

Returns:

the algorithm name.