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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.vfs.provider.bzip2;
18  
19  //TODO: Revert to [compress]
20  //import org.apache.commons.compress.bzip2.CBZip2InputStream;
21  //import org.apache.commons.compress.bzip2.CBZip2OutputStream;
22  import org.apache.commons.vfs.FileName;
23  import org.apache.commons.vfs.FileObject;
24  import org.apache.commons.vfs.FileSystemException;
25  import org.apache.commons.vfs.provider.compressed.CompressedFileFileObject;
26  import org.apache.commons.vfs.provider.compressed.CompressedFileFileSystem;
27  
28  import java.io.IOException;
29  import java.io.InputStream;
30  import java.io.OutputStream;
31  
32  /***
33   * the bzip2 file
34   *
35   * @author <a href="mailto:imario@apache.org">Mario Ivankovits</a>
36   * @version $Revision: 480428 $ $Date: 2006-11-29 07:15:24 +0100 (Mi, 29 Nov 2006) $
37   */
38  public class Bzip2FileObject extends CompressedFileFileObject
39  {
40      protected Bzip2FileObject(FileName name, FileObject container, CompressedFileFileSystem fs)
41      {
42          super(name, container, fs);
43      }
44  
45      protected InputStream doGetInputStream() throws Exception
46      {
47          // check file
48          InputStream is = getContainer().getContent().getInputStream();
49          return wrapInputStream(getName().getURI(), is);
50      }
51  
52      public static InputStream wrapInputStream(final String name, final InputStream is) throws IOException
53      {
54          final int b1 = is.read();
55          final int b2 = is.read();
56          if (b1 != 'B' || b2 != 'Z')
57          {
58              throw new FileSystemException("vfs.provider.compressedFile/not-a-compressedFile-file.error", name);
59          }
60          return new CBZip2InputStream(is);
61      }
62  
63      protected OutputStream doGetOutputStream(boolean bAppend) throws Exception
64      {
65          OutputStream os = getContainer().getContent().getOutputStream(false);
66          os.write('B');
67          os.write('Z');
68  
69          return new CBZip2OutputStream(os);
70      }
71  }