org.apache.flink.runtime.io.compression

Class Lz4BlockDecompressor

java.lang.Object

org.apache.flink.runtime.io.compression.Lz4BlockDecompressor

All Implemented Interfaces:

BlockDecompressor

public class Lz4BlockDecompressor
extends Object
implements BlockDecompressor

Decode data written with Lz4BlockCompressor. It reads from and writes to byte arrays provided from the outside, thus reducing copy time.

This class is copied and modified from LZ4BlockInputStream.

Constructor Summary

Constructors

Constructor and Description
Lz4BlockDecompressor()

Method Summary

Modifier and Type	Method and Description
int	decompress(byte[] src, int srcOff, int srcLen, byte[] dst, int dstOff) Decompress source data read from src and write the decompressed data to dst.
int	decompress(ByteBuffer src, int srcOff, int srcLen, ByteBuffer dst, int dstOff) Decompress source data read from (Buffer.position() + srcOff), and write the decompressed data to dst.

Methods inherited from class java.lang.Object

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

Constructor Detail

Lz4BlockDecompressor

public Lz4BlockDecompressor()

Method Detail

decompress

public int decompress(ByteBuffer src,
                      int srcOff,
                      int srcLen,
                      ByteBuffer dst,
                      int dstOff)
               throws DataCorruptionException

Description copied from interface: BlockDecompressor

Decompress source data read from (Buffer.position() + srcOff), and write the decompressed data to dst.

Specified by:

decompress in interface BlockDecompressor

Parameters:

src - Compressed data to read from

srcOff - The start offset of compressed data

srcLen - The length of data which want to be decompressed

dst - The target to write decompressed data

dstOff - The start offset to write the decompressed data

Returns:

Length of decompressed data

Throws:

DataCorruptionException - if data corruption found when decompressing

decompress

public int decompress(byte[] src,
                      int srcOff,
                      int srcLen,
                      byte[] dst,
                      int dstOff)
               throws InsufficientBufferException,
                      DataCorruptionException

Description copied from interface: BlockDecompressor

Decompress source data read from src and write the decompressed data to dst.

Specified by:

decompress in interface BlockDecompressor

Parameters:

src - Compressed data to read from

srcOff - The start offset of compressed data

srcLen - The length of data which want to be decompressed

dst - The target to write decompressed data

dstOff - The start offset to write the decompressed data

Returns:

Length of decompressed data

Throws:

InsufficientBufferException - if the target does not have sufficient space

DataCorruptionException - if data corruption found when decompressing