Package net.jpountz.lz4

Class LZ4DecompressorWithLength

java.lang.Object

net.jpountz.lz4.LZ4DecompressorWithLength

public class LZ4DecompressorWithLength
extends java.lang.Object

Convenience class to decompress data compressed by LZ4CompressorWithLength. This decompressor is NOT compatible with any other compressors in lz4-java or any other lz4 tools. The user does not need to specify the length of the compressed data or original data because the length of the original decompressed data is included in the compressed data.

Constructor Summary

Constructors

Constructor	Description
LZ4DecompressorWithLength(LZ4FastDecompressor decompressor)	Creates a new decompressor to decompress data compressed by LZ4CompressorWithLength.

Method Summary

Modifier and Type	Method	Description
byte[]	decompress(byte[] src)	Convenience method, equivalent to calling decompress(src, 0).
int	decompress(byte[] src, byte[] dest)	Convenience method, equivalent to calling decompress(src, 0, dest, 0).
byte[]	decompress(byte[] src, int srcOff)	Convenience method which returns src[srcOff:] decompressed.
int	decompress(byte[] src, int srcOff, byte[] dest, int destOff)	Decompresses src[srcOff:] into dest[destOff:] and returns the number of bytes read from src.
int	decompress(java.nio.ByteBuffer src, int srcOff, java.nio.ByteBuffer dest, int destOff)	Decompresses src[srcOff:] into dest[destOff:] and returns the number of bytes read from src.
void	decompress(java.nio.ByteBuffer src, java.nio.ByteBuffer dest)	Decompresses src into dest.
static int	getDecompressedLength(byte[] src)	Returns the decompressed length of compressed data in src.
static int	getDecompressedLength(byte[] src, int srcOff)	Returns the decompressed length of compressed data in src[srcOff:].
static int	getDecompressedLength(java.nio.ByteBuffer src)	Returns the decompressed length of compressed data in src.
static int	getDecompressedLength(java.nio.ByteBuffer src, int srcOff)	Returns the decompressed length of compressed data in src[srcOff:].

Methods inherited from class java.lang.Object

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

Constructor Detail

LZ4DecompressorWithLength

public LZ4DecompressorWithLength(LZ4FastDecompressor decompressor)

Creates a new decompressor to decompress data compressed by LZ4CompressorWithLength.

Parameters:

decompressor - decompressor to use

Method Detail

getDecompressedLength

public static int getDecompressedLength(byte[] src)

Returns the decompressed length of compressed data in src.

Parameters:

src - the compressed data

Returns:

the decompressed length

getDecompressedLength

public static int getDecompressedLength(byte[] src,
                                        int srcOff)

Returns the decompressed length of compressed data in src[srcOff:].

Parameters:

src - the compressed data

srcOff - the start offset in src

Returns:

the decompressed length

getDecompressedLength

public static int getDecompressedLength(java.nio.ByteBuffer src)

Returns the decompressed length of compressed data in src.

Parameters:

src - the compressed data

Returns:

the decompressed length

getDecompressedLength

public static int getDecompressedLength(java.nio.ByteBuffer src,
                                        int srcOff)

Returns the decompressed length of compressed data in src[srcOff:].

Parameters:

src - the compressed data

srcOff - the start offset in src

Returns:

the decompressed length

decompress

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

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

Parameters:

src - the compressed data

dest - the destination buffer to store the decompressed data

Returns:

the number of bytes read to restore the original input

decompress

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

Decompresses src[srcOff:] into dest[destOff:] and returns the number of bytes read from src.

Parameters:

src - the compressed data

srcOff - the start offset in src

dest - the destination buffer to store the decompressed data

destOff - the start offset in dest

Returns:

the number of bytes read to restore the original input

decompress

public byte[] decompress(byte[] src)

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

Parameters:

src - the compressed data

Returns:

the decompressed data

decompress

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

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.

Parameters:

src - the compressed data

srcOff - the start offset in src

Returns:

the decompressed data

decompress

public void decompress(java.nio.ByteBuffer src,
                       java.nio.ByteBuffer dest)

Decompresses src into dest. This method moves the positions of the buffers.

Parameters:

src - the compressed data

dest - the destination buffer to store the decompressed data

decompress

public int decompress(java.nio.ByteBuffer src,
                      int srcOff,
                      java.nio.ByteBuffer dest,
                      int destOff)

Decompresses src[srcOff:] into dest[destOff:] and returns the number of bytes read from src. The positions and limits of the ByteBuffers remain unchanged.

Parameters:

src - the compressed data

srcOff - the start offset in src

dest - the destination buffer to store the decompressed data

destOff - the start offset in dest

Returns:

the number of bytes read to restore the original input