nom.tam.fits.compress.GZipCompressionProvider Maven / Gradle / Ivy
package nom.tam.fits.compress;
/*
* #%L
* nom.tam FITS library
* %%
* Copyright (C) 1996 - 2024 nom-tam-fits
* %%
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* #L%
*/
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;
/**
* (for internal use) GZIP (.gz) input stream decompression. You can use this class to decompress
* files that have been compressed with gzip, or use {@link CompressionManager} to automatically detect the type
* of compression used. This class uses Java's builtin {@link GZIPInputStream} class to handle the lifting.
*
* @see CompressionManager
*/
public class GZipCompressionProvider implements ICompressProvider {
private static final int GZIP_MAGIC_BYTE1 = 0x1f;
private static final int GZIP_MAGIC_BYTE2 = 0x8b;
private static final int PRIORITY = 5;
@Override
public InputStream decompress(InputStream in) throws IOException {
return new GZIPInputStream(in);
}
@Override
public int priority() {
return PRIORITY;
}
@Override
public boolean provides(int mag1, int mag2) {
return mag1 == GZIP_MAGIC_BYTE1 && mag2 == GZIP_MAGIC_BYTE2;
}
}