nom.tam.fits.compress.ZCompressionProvider Maven / Gradle / Ivy
package nom.tam.fits.compress;
/*
* #%L
* nom.tam FITS library
* %%
* Copyright (C) 1996 - 2024 nom-tam-fits
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* This is free and unencumbered software released into the public domain.
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* distribute this software, either in source code form or as a compiled
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* 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.
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* 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.
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import java.io.IOException;
import java.io.InputStream;
/**
* (for internal use) UNIX compressed (.Z) input stream decompression. You can use this class to
* decompress files that have been compressed with the UNIX compress tool (or via gzip) and have the
* characteristic .Z file name extension. Or, use {@link CompressionManager} to automatically detect the
* type of compression used. This class uses the Apache commons-compress package to perform the decompression.
*
* @see CompressionManager
*/
public class ZCompressionProvider implements ICompressProvider {
private static final int Z_COMPRESS_MAGIC_BYTE1 = 0x1f;
private static final int Z_COMPRESS_MAGIC_BYTE2 = 0x9d;
private static final int PRIORITY = 5;
@SuppressWarnings("deprecation")
@Override
public InputStream decompress(InputStream in) throws IOException {
try {
return CompressionLibLoaderProtection.createZStream(in);
} catch (IOException e) {
throw e;
} catch (Exception e) {
throw new IOException(e);
}
}
@Override
public int priority() {
return PRIORITY;
}
@Override
public boolean provides(int mag1, int mag2) {
return mag1 == Z_COMPRESS_MAGIC_BYTE1 && mag2 == Z_COMPRESS_MAGIC_BYTE2;
}
}