nom.tam.fits.compress

Class CompressionManager

java.lang.Object

nom.tam.fits.compress.CompressionManager

public final class CompressionManager
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static int	ONE_MEGABYTE

Method Summary

Modifier and Type	Method and Description
static InputStream	decompress(InputStream compressed) This method decompresses a compressed input stream.
static boolean	isCompressed(File file) Is a file compressed? (the magic number in the first 2 bytes is used to detect the compression.
static boolean	isCompressed(String filename) Is a file compressed? (the magic number in the first 2 bytes is used to detect the compression.
protected static ICompressProvider	nextCompressionProvider(int mag1, int mag2, ICompressProvider old)

Methods inherited from class java.lang.Object

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

Field Detail

ONE_MEGABYTE

public static final int ONE_MEGABYTE

See Also:

Constant Field Values

Method Detail

decompress

public static InputStream decompress(InputStream compressed)
                              throws FitsException

This method decompresses a compressed input stream. The decompression method is selected automatically based upon the first two bytes read.

Parameters:

compressed - The compressed input stream

Returns:

A stream which wraps the input stream and decompresses it. If the input stream is not compressed, a pushback input stream wrapping the original stream is returned.

Throws:

FitsException - when the stream could not be read or decompressed

isCompressed

public static boolean isCompressed(File file)

Is a file compressed? (the magic number in the first 2 bytes is used to detect the compression.

Parameters:

file - file to test for compression algorithms

Returns:

true if the file is compressed

isCompressed

public static boolean isCompressed(String filename)

Is a file compressed? (the magic number in the first 2 bytes is used to detect the compression.

Parameters:

filename - of the file to test for compression algorithms

Returns:

true if the file is compressed

nextCompressionProvider

protected static ICompressProvider nextCompressionProvider(int mag1,
                                                           int mag2,
                                                           ICompressProvider old)