nom.tam.fits.compression.algorithm.hcompress

Class HCompress

java.lang.Object

nom.tam.fits.compression.algorithm.hcompress.HCompress

public class HCompress
extends Object

The original compression code was written by Richard White 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. The original site for the algorithm is

Author:

Richard White, William Pence, Richard van Nieuwenhoven

See Also:

http://www.stsci.edu/software/hcompress.html

Field Summary

Fields

Modifier and Type	Field and Description
protected static int	BITS_OF_1_BYTE
protected static int	BITS_OF_1_NYBBLE
protected static int	BYTE_MASK
protected static int	NYBBLE_MASK
protected static double	ROUNDING_HALF

Constructor Summary

Constructors

Constructor and Description
HCompress()

Method Summary

Modifier and Type	Method and Description
protected void	compress(long[] aa, int ny, int nx, int scale, ByteBuffer output)

Methods inherited from class java.lang.Object

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

Field Detail

ROUNDING_HALF

protected static final double ROUNDING_HALF

See Also:

Constant Field Values

BITS_OF_1_BYTE

protected static final int BITS_OF_1_BYTE

See Also:

Constant Field Values

BITS_OF_1_NYBBLE

protected static final int BITS_OF_1_NYBBLE

See Also:

Constant Field Values

BYTE_MASK

protected static final int BYTE_MASK

See Also:

Constant Field Values

NYBBLE_MASK

protected static final int NYBBLE_MASK

See Also:

Constant Field Values

Constructor Detail

HCompress

public HCompress()

Method Detail

compress

protected void compress(long[] aa,
                        int ny,
                        int nx,
                        int scale,
                        ByteBuffer output)