Package nom.tam.fits.compression.algorithm.rice

Class RiceCompressor<T extends Buffer>

java.lang.Object

nom.tam.fits.compression.algorithm.rice.RiceCompressor<T>

Type Parameters:

T - the genetic type of NIO buffer on which this compressor operates.

All Implemented Interfaces:

ICompressor<T>

Direct Known Subclasses:

RiceCompressor.ByteRiceCompressor, RiceCompressor.IntRiceCompressor, RiceCompressor.ShortRiceCompressor

public abstract class RiceCompressor<T extends Buffer>
extends Object
implements ICompressor<T>

(for internal use) The Rice compression algorithm. The original compression was designed by Rice, Yeh, and Miller the code was written by Richard White at STScI at the STScI and included (ported to c and adapted) in cfitsio by William Pence, NASA/GSFC. That code was then ported to java by R. van Nieuwenhoven. Later it was massively refactored to harmonize the different compression algorithms and reduce the duplicate code pieces without obscuring the algorithm itself as far as possible.

Author:

Richard White, William Pence, Richard van Nieuwenhoven

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	RiceCompressor.ByteRiceCompressor
static class	RiceCompressor.DoubleRiceCompressor
static class	RiceCompressor.FloatRiceCompressor
static class	RiceCompressor.IntRiceCompressor
static class	RiceCompressor.ShortRiceCompressor

Method Summary

Modifier and Type	Method	Description
protected void	compress(int dataLength, int firstPixel, BitBuffer buffer)	compress the integer tiledImageOperation on a rise compressed byte buffer.
protected void	decompressBuffer(ByteBuffer readBuffer, int nx)	decompress the readbuffer and fill the pixelarray.
protected abstract int	nextPixel()
protected abstract void	nextPixel(int pixel)

Methods inherited from class java.lang.Object

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

Methods inherited from interface nom.tam.fits.compression.algorithm.api.ICompressor

compress, decompress

Method Details

compress

protected void compress(int dataLength,
 int firstPixel,
 BitBuffer buffer)

compress the integer tiledImageOperation on a rise compressed byte buffer.

Parameters:

dataLength - length of the data to compress

firstPixel - the value of the first pixel

buffer - the buffer to write to

decompressBuffer

protected void decompressBuffer(ByteBuffer readBuffer,
 int nx)

decompress the readbuffer and fill the pixelarray.

Parameters:

readBuffer - input buffer

nx - the number of pixel to uncompress

nextPixel

protected abstract int nextPixel()

nextPixel

protected abstract void nextPixel(int pixel)