[14627] | 1 | /*
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| 2 | * Copyright 2000-2002,2004 The Apache Software Foundation
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| 3 | *
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License");
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| 5 | * you may not use this file except in compliance with the License.
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| 6 | * You may obtain a copy of the License at
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| 7 | *
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0
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| 9 | *
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| 10 | * Unless required by applicable law or agreed to in writing, software
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 13 | * See the License for the specific language governing permissions and
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| 14 | * limitations under the License.
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| 15 | *
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| 16 | */
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| 17 |
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| 18 | package org.apache.tools.ant.taskdefs;
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| 19 |
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| 20 | import java.io.FileInputStream;
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| 21 | import java.io.FileOutputStream;
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| 22 | import java.io.IOException;
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| 23 | import java.util.zip.GZIPInputStream;
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| 24 | import org.apache.tools.ant.BuildException;
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| 25 |
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| 26 | /**
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| 27 | * Expands a file that has been compressed with the GZIP
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| 28 | * algorithm. Normally used to compress non-compressed archives such
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| 29 | * as TAR files.
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| 30 | *
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| 31 | * @since Ant 1.1
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| 32 | *
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| 33 | * @ant.task category="packaging"
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| 34 | */
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| 35 |
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| 36 | public class GUnzip extends Unpack {
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| 37 |
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| 38 | private static final String DEFAULT_EXTENSION = ".gz";
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| 39 |
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| 40 | protected String getDefaultExtension() {
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| 41 | return DEFAULT_EXTENSION;
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| 42 | }
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| 43 |
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| 44 | protected void extract() {
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| 45 | if (source.lastModified() > dest.lastModified()) {
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| 46 | log("Expanding " + source.getAbsolutePath() + " to "
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| 47 | + dest.getAbsolutePath());
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| 48 |
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| 49 | FileOutputStream out = null;
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| 50 | GZIPInputStream zIn = null;
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| 51 | FileInputStream fis = null;
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| 52 | try {
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| 53 | out = new FileOutputStream(dest);
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| 54 | fis = new FileInputStream(source);
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| 55 | zIn = new GZIPInputStream(fis);
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| 56 | byte[] buffer = new byte[8 * 1024];
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| 57 | int count = 0;
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| 58 | do {
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| 59 | out.write(buffer, 0, count);
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| 60 | count = zIn.read(buffer, 0, buffer.length);
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| 61 | } while (count != -1);
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| 62 | } catch (IOException ioe) {
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| 63 | String msg = "Problem expanding gzip " + ioe.getMessage();
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| 64 | throw new BuildException(msg, ioe, getLocation());
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| 65 | } finally {
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| 66 | if (fis != null) {
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| 67 | try {
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| 68 | fis.close();
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| 69 | } catch (IOException ioex) {
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| 70 | //ignore
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| 71 | }
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| 72 | }
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| 73 | if (out != null) {
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| 74 | try {
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| 75 | out.close();
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| 76 | } catch (IOException ioex) {
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| 77 | //ignore
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| 78 | }
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| 79 | }
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| 80 | if (zIn != null) {
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| 81 | try {
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| 82 | zIn.close();
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| 83 | } catch (IOException ioex) {
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| 84 | //ignore
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| 85 | }
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| 86 | }
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| 87 | }
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| 88 | }
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| 89 | }
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| 90 | }
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