Compression

java.lang.Object
- com.jcraft.jsch.juz.Compression

All Implemented Interfaces:

Compression
```
public class Compression
extends java.lang.Object
implements Compression
```
This example demonstrates the packet compression without using jzlib[1].
The ssh protocol adopts zlib[2] for the packet compression. Fortunately, JDK has provided wrapper classes for zlib(j.u.z.{Deflater, Inflater}), but it does not expose enough functionality of zlib, unfortunately; it must not allow to compress data with SYNC_FLUSH. So, JSch has been using jzlib by the default. After 12 years of bug parade entry[3] filing, Java7 has revised j.u.z.Deflater, and SYNC_FLUSH has been supported at last. This example shows how to enable the packet compression by using JDK's java.util.zip package.
[1] http://www.jcraft.com/jzlib/ [2] http://www.zlib.net/ [3] https://bugs.openjdk.java.net/browse/JDK-4206909

Field Summary
- Fields inherited from interface com.jcraft.jsch.Compression
  DEFLATER, INFLATER

Constructor Summary

Constructors
Constructor Description

Compression()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`byte[]`	`compress(byte[] buf, int start, int[] end)`
`void`	`end()`
`void`	`init(int type, int level)`
`void`	`init(int type, int level, Session session)`
`byte[]`	`uncompress(byte[] buf, int start, int[] len)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail
- Compression
```
public Compression()
```

Method Detail

end
```
public void end()
```
Specified by:

end in interface Compression

init

public void init(int type,
                 int level,
                 Session session)

Specified by:: init in interface Compression

init

public void init(int type,
                 int level)

Specified by:: init in interface Compression

compress

public byte[] compress(byte[] buf,
                       int start,
                       int[] end)

Specified by:: compress in interface Compression

uncompress

public byte[] uncompress(byte[] buf,
                         int start,
                         int[] len)

Specified by:: uncompress in interface Compression