1 package nom.tam.fits.compress;
2
3 /*
4 * #%L
5 * nom.tam FITS library
6 * %%
7 * Copyright (C) 1996 - 2024 nom-tam-fits
8 * %%
9 * This is free and unencumbered software released into the public domain.
10 *
11 * Anyone is free to copy, modify, publish, use, compile, sell, or
12 * distribute this software, either in source code form or as a compiled
13 * binary, for any purpose, commercial or non-commercial, and by any
14 * means.
15 *
16 * In jurisdictions that recognize copyright laws, the author or authors
17 * of this software dedicate any and all copyright interest in the
18 * software to the public domain. We make this dedication for the benefit
19 * of the public at large and to the detriment of our heirs and
20 * successors. We intend this dedication to be an overt act of
21 * relinquishment in perpetuity of all present and future rights to this
22 * software under copyright law.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
27 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
28 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
29 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
30 * OTHER DEALINGS IN THE SOFTWARE.
31 * #L%
32 */
33
34 import java.io.IOException;
35 import java.io.InputStream;
36
37 /**
38 * (<i>for internal use</i>) BZIP2 (<code>.bz2</code>) input stream decompression. You can use this class to decompress
39 * files that have been compressed with <code>bzip2</code>, or use {@link CompressionManager} to automatically detect
40 * the type of compression used. This class uses the Apache <b>commons-compress</b> package to perform the
41 * decompression.
42 *
43 * @see CompressionManager
44 */
45 public class BZip2CompressionProvider implements ICompressProvider {
46
47 private static final int PRIORITY = 5;
48
49 @SuppressWarnings("deprecation")
50 @Override
51 public InputStream decompress(InputStream in) throws IOException {
52 try {
53 return CompressionLibLoaderProtection.createBZip2Stream(in);
54 } catch (IOException e) {
55 throw e;
56 } catch (Exception e) {
57 throw new IOException(e);
58 }
59 }
60
61 @Override
62 public int priority() {
63 return PRIORITY;
64 }
65
66 @Override
67 public boolean provides(int mag1, int mag2) {
68 return mag1 == 'B' && mag2 == 'Z';
69 }
70 }