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Java > Open Source Codes > com > caucho > quercus > lib > zip > ZipEntryInputStream


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  *
23  * Free Software Foundation, Inc.
24  * 59 Temple Place, Suite 330
25  * Boston, MA 02111-1307 USA
26  *
27  * @author Nam Nguyen
28  */

29
30 package com.caucho.quercus.lib.zip;
31
32 import com.caucho.quercus.lib.file.BinaryInput;
33 import com.caucho.quercus.lib.file.ReadStreamInput;
34 import com.caucho.vfs.*;
35
36 import java.io.IOException JavaDoc;
37 import java.util.zip.ZipEntry JavaDoc;
38 import java.util.zip.ZipInputStream JavaDoc;
39
40 /**
41  * Input from a compressed stream.
42  * XXX: might want to replace ZipInputStream with an Inflater so
43  * that we don't read this entry's header twice
44  */

45 public class ZipEntryInputStream extends ReadStreamInput
46 {
47   private BinaryInput _in;
48   private ZipInputStream JavaDoc _zipIn;
49   private QuercusZipEntry _entry;
50   
51   public ZipEntryInputStream(BinaryInput in, QuercusZipEntry entry)
52     throws IOException JavaDoc
53   {
54     init(in, entry);
55   }
56
57   protected void init(BinaryInput in, QuercusZipEntry entry)
58     throws IOException JavaDoc
59   {
60     in.setPosition(entry.getPosition());
61
62     _in = in;
63     _zipIn = new ZipInputStream JavaDoc(in.getInputStream());
64     _entry = entry;
65
66     ZipEntry JavaDoc curEntry = _zipIn.getNextEntry();
67
68     if (curEntry == null)
69       throw new IOException JavaDoc("Zip entry " +
70           entry.getZipEntry().getName() + " not found.");
71
72     init(new ReadStream(new VfsStream(_zipIn, null)));
73   }
74
75   /**
76    * Opens a copy.
77    */

78   public BinaryInput openCopy()
79     throws IOException JavaDoc
80   {
81     return new ZipEntryInputStream(_in.openCopy(), _entry);
82   }
83
84   public String JavaDoc toString()
85   {
86     return "ZipEntryInputStream[]";
87   }
88 }
89
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