Package me.lemire.integercompression

Class DeltaZigzagVariableByte

java.lang.Object

me.lemire.integercompression.DeltaZigzagVariableByte

All Implemented Interfaces:

IntegerCODEC

public class DeltaZigzagVariableByte
extends Object
implements IntegerCODEC

VariableByte with Delta+Zigzag Encoding.

Author:

MURAOKA Taro http://github.com/koron

Constructor Summary

Constructors

Constructor	Description
DeltaZigzagVariableByte()

Method Summary

Modifier and Type	Method	Description
void	compress(int[] inBuf, IntWrapper inPos, int inLen, int[] outBuf, IntWrapper outPos)	Compress data from an array to another array.
protected ByteBuffer	makeBuffer(int sizeInBytes)	Creates a new buffer of the requested size.
String	toString()
void	uncompress(int[] inBuf, IntWrapper inPos, int inLen, int[] outBuf, IntWrapper outPos)	Uncompress data from an array to another array.

Methods inherited from class java.lang.Object

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

Constructor Details

DeltaZigzagVariableByte

public DeltaZigzagVariableByte()

Method Details

toString

public String toString()

Overrides:

toString in class Object

compress

public void compress(int[] inBuf,
 IntWrapper inPos,
 int inLen,
 int[] outBuf,
 IntWrapper outPos)

Description copied from interface: IntegerCODEC

Compress data from an array to another array. Both inpos and outpos are modified to represent how much data was read and written to. If 12 ints (inlength = 12) are compressed to 3 ints, then inpos will be incremented by 12 while outpos will be incremented by 3. We use IntWrapper to pass the values by reference.

Specified by:

compress in interface IntegerCODEC

Parameters:

inBuf - input array

inPos - where to start reading in the array

inLen - how many integers to compress

outBuf - output array

outPos - where to write in the output array

uncompress

public void uncompress(int[] inBuf,
 IntWrapper inPos,
 int inLen,
 int[] outBuf,
 IntWrapper outPos)

Description copied from interface: IntegerCODEC

Uncompress data from an array to another array. Both inpos and outpos parameters are modified to indicate new positions after read/write.

Specified by:

uncompress in interface IntegerCODEC

Parameters:

inBuf - array containing data in compressed form

inPos - where to start reading in the array

inLen - length of the compressed data (ignored by some schemes)

outBuf - array where to write the compressed output

outPos - where to start writing the uncompressed output in out

makeBuffer

protected ByteBuffer makeBuffer(int sizeInBytes)

Creates a new buffer of the requested size. In case you need a different way to allocate buffers, you can override this method with a custom behavior. The default implementation allocates a new Java direct ByteBuffer on each invocation.

Parameters:

sizeInBytes -

Returns: