net.jpountz.lz4

Class LZ4FastDecompressor

java.lang.Object

net.jpountz.lz4.LZ4FastDecompressor

All Implemented Interfaces:

LZ4Decompressor

public abstract class LZ4FastDecompressor
extends Object
implements LZ4Decompressor

LZ4 decompressor that requires the size of the original input to be known. Use LZ4SafeDecompressor if you only know the size of the compressed stream.

Instances of this class are thread-safe.

Constructor Summary

Constructors

Constructor and Description
LZ4FastDecompressor()

Method Summary

Methods

Modifier and Type	Method and Description
int	decompress(byte[] src, byte[] dest) Convenience method, equivalent to calling decompress(src, dest, dest.length).
int	decompress(byte[] src, byte[] dest, int destLen) Convenience method, equivalent to calling decompress(src, 0, dest, 0, destLen).
byte[]	decompress(byte[] src, int destLen) Convenience method, equivalent to calling decompress(src, 0, destLen).
abstract int	decompress(byte[] src, int srcOff, byte[] dest, int destOff, int destLen) Uncompress src[srcOff:] into dest[destOff:destOff+destLen] and return the number of bytes read from src.
byte[]	decompress(byte[] src, int srcOff, int destLen) Convenience method which returns src[srcOff:?] decompressed.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

LZ4FastDecompressor

public LZ4FastDecompressor()

Method Detail

decompress

public abstract int decompress(byte[] src,
             int srcOff,
             byte[] dest,
             int destOff,
             int destLen)

Uncompress src[srcOff:] into dest[destOff:destOff+destLen] and return the number of bytes read from src. destLen must be exactly the size of the decompressed data.

Specified by:

decompress in interface LZ4Decompressor

Parameters:

destLen - the exact size of the original input

Returns:

the number of bytes read to restore the original input

decompress

public final int decompress(byte[] src,
             byte[] dest,
             int destLen)

Convenience method, equivalent to calling decompress(src, 0, dest, 0, destLen).

decompress

public final int decompress(byte[] src,
             byte[] dest)

Convenience method, equivalent to calling decompress(src, dest, dest.length).

decompress

public final byte[] decompress(byte[] src,
                int srcOff,
                int destLen)

Convenience method which returns src[srcOff:?] decompressed.

Warning: this method has an important overhead due to the fact that it needs to allocate a buffer to decompress into.

Here is how this method is implemented:

 final byte[] decompressed = new byte[destLen];
 decompress(src, srcOff, decompressed, 0, destLen);
 return decompressed;
 

decompress

public final byte[] decompress(byte[] src,
                int destLen)

Convenience method, equivalent to calling decompress(src, 0, destLen).

toString

public String toString()

Overrides:

toString in class Object