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Date: Mon, 27 Jun 2011 23:53:17 +0000 (UTC)
From: "Torsten Curdt (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
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Subject: [jira] [Commented] (COMPRESS-137) TarArchiveEntry.getFile() always
 returns null + no way to get an InputStream from TarArchiveInputStream
 similar to what you do with
 (java.util.zip.ZipFile())..getInputStream(ZipEntry);
MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit


    [ https://issues.apache.org/jira/browse/COMPRESS-137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13056213#comment-13056213 ] 

Torsten Curdt commented on COMPRESS-137:
----------------------------------------

As demonstrated in 

https://svn.apache.org/repos/asf/commons/proper/compress/trunk/src/test/java/org/apache/commons/compress/ChainingTestCase.java

chaining works just fine.

You misunderstood the meaning of "getFile" (TBH I think that method should not exist at all) and are using the API the wrong way. Compress uses the same approach as the standard JDK classes.

In your case this means you need to find your ArchiveEntry and then the InputStream is positioned right where you need it. Search for "testTarUnarchive" to see an example.

> TarArchiveEntry.getFile() always returns null + no way to get an InputStream from TarArchiveInputStream similar to what you do with (java.util.zip.ZipFile())..getInputStream(ZipEntry);
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: COMPRESS-137
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-137
>             Project: Commons Compress
>          Issue Type: Bug
>          Components: Compressors
>    Affects Versions: 1.1
>         Environment: $ uname -a
> Linux Microknoppix 2.6.31.6 #4 SMP PREEMPT Tue Nov 10 19:11:11 CET 2009 i686 GNU/Linux
> $ java -version
> java version "1.6.0_16"
> Java(TM) SE Runtime Environment (build 1.6.0_16-b01)
> Java HotSpot(TM) Client VM (build 14.2-b01, mixed mode, sharing)
> $ echo $CLASSPATH
> /media/sdb3/prjx/Java/JUtils:/media/sdb3/prjx/Java/JUtils/jars/commons-compress-1.1.jar:.
>            Reporter: Albretch Mueller
>            Priority: Critical
>              Labels: zip_through_XMLReader
>             Fix For: 1.1
>
>
> ~ 
>  this is a test run using httpd-2.2.19.tar[.gz,bz2] to show what I mean
> ~ 
>  lbrtchx
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 
> $ wget http://apache.cyberuse.com//httpd/httpd-2.2.19.tar.gz
> --2011-06-27 11:21:46--  http://apache.cyberuse.com//httpd/httpd-2.2.19.tar.gz
> Resolving apache.cyberuse.com... 174.132.149.89
> Connecting to apache.cyberuse.com|174.132.149.89|:80... connected.
> HTTP request sent, awaiting response... 200 OK
> Length: 7113418 (6.8M) [application/x-gzip]
> Saving to: `httpd-2.2.19.tar.gz'
> 100%[===...===>] 7,113,418    296K/s   in 24s     
> 2011-06-27 11:22:10 (285 KB/s) - `httpd-2.2.19.tar.gz' saved [7113418/7113418]
> $ wget http://apache.cyberuse.com//httpd/httpd-2.2.19.tar.bz2
> --2011-06-27 11:22:19--  http://apache.cyberuse.com//httpd/httpd-2.2.19.tar.bz2
> Resolving apache.cyberuse.com... 174.132.149.89
> Connecting to apache.cyberuse.com|174.132.149.89|:80... connected.
> HTTP request sent, awaiting response... 200 OK
> Length: 5322082 (5.1M) [application/x-bzip2]
> Saving to: `httpd-2.2.19.tar.bz2'
> 100%[===...===>] 5,322,082    256K/s   in 25s     
> 2011-06-27 11:22:44 (207 KB/s) - `httpd-2.2.19.tar.bz2' saved [5322082/5322082]
> $ wget http://www.apache.org/dist/httpd/httpd-2.2.19.tar.gz.md5
> --2011-06-27 11:22:51--  http://www.apache.org/dist/httpd/httpd-2.2.19.tar.gz.md5
> Resolving www.apache.org... 140.211.11.131
> Connecting to www.apache.org|140.211.11.131|:80... connected.
> HTTP request sent, awaiting response... 200 OK
> Length: 54 [text/plain]
> Saving to: `httpd-2.2.19.tar.gz.md5'
> 100%[===...===>] 54          --.-K/s   in 0s      
> 2011-06-27 11:22:51 (4.23 MB/s) - `httpd-2.2.19.tar.gz.md5' saved [54/54]
> $ wget http://www.apache.org/dist/httpd/httpd-2.2.19.tar.bz2.md5
> --2011-06-27 11:23:02--  http://www.apache.org/dist/httpd/httpd-2.2.19.tar.bz2.md5
> Resolving www.apache.org... 140.211.11.131
> Connecting to www.apache.org|140.211.11.131|:80... connected.
> HTTP request sent, awaiting response... 200 OK
> Length: 55 [text/plain]
> Saving to: `httpd-2.2.19.tar.bz2.md5'
> 100%[===...===>] 55          --.-K/s   in 0s      
> 2011-06-27 11:23:02 (4.91 MB/s) - `httpd-2.2.19.tar.bz2.md5' saved [55/55]
> $ ls -l httpd-2.2.19.tar.*
> -rw-r--r-- 1 knoppix knoppix 5322082 May 21 18:58 httpd-2.2.19.tar.bz2
> -rw-r--r-- 1 knoppix knoppix      55 May 21 18:58 httpd-2.2.19.tar.bz2.md5
> -rw-r--r-- 1 knoppix knoppix 7113418 May 21 18:58 httpd-2.2.19.tar.gz
> -rw-r--r-- 1 knoppix knoppix      54 May 21 18:58 httpd-2.2.19.tar.gz.md5
> $ md5sum -b httpd-2.2.19.tar.bz2
> 832f96a6ec4b8fc7cf49b9efd4e89060 *httpd-2.2.19.tar.bz2
> $ md5sum -b httpd-2.2.19.tar.gz
> e9f5453e1e4d7aeb0e7ec7184c6784b5 *httpd-2.2.19.tar.gz
> $ cat *.md5
> 832f96a6ec4b8fc7cf49b9efd4e89060 *httpd-2.2.19.tar.bz2
> e9f5453e1e4d7aeb0e7ec7184c6784b5 *httpd-2.2.19.tar.gz
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 
> /*
>  TarArchiveEntry.getFile() always returns null + no way to get an InputStream from TarArchiveInputStream similar to what you do with (java.util.zip.ZipFile())..getInputStream(ZipEntry);
> */
> import org.apache.commons.compress.compressors.bzip2.*;
> import org.apache.commons.compress.compressors.gzip.*;
> import org.apache.commons.compress.archivers.tar.*;
> import org.apache.commons.compress.utils.*;
> import org.apache.commons.compress.archivers.*;
> import java.io.*;
> import java.util.*;
> import java.text.*;
> // __ 
> public class TAR00Test{
> // __ 
>  public static void main(String[] args){
> // __ 
>   TarArchiveInputStream TArkIS = null;
>   TarArchiveEntry TArkEntry = null;
>   File TARFl, IFl, IDir = new File("/media/sda1/prjx/sw/text_synch/XML_Fls/test");
>   String[] aIFl = new String[]{"httpd-2.2.19.tar.bz2", "httpd-2.2.19.tar.gz"};
>   String aFlPth;
> // __ 
>   try{
>    for(int i = 0; (i < aIFl.length); ++i){
>     IFl = new File(IDir, aIFl[i]);
>     aFlPth = IFl.getCanonicalPath();
>     if(IFl.exists()){
>      aFlPth = aFlPth.toLowerCase();
> // __ 
>      if(aFlPth.endsWith(".tar.bz2")){
>       TArkIS = new TarArchiveInputStream(new BZip2CompressorInputStream(new FileInputStream(IFl)));
>      }
>      else if(aFlPth.endsWith(".tar.gz")){
>       TArkIS = new TarArchiveInputStream(new GzipCompressorInputStream(new FileInputStream(IFl)));
>      }
>      else{} // ...
> // __ 
>      TArkEntry = (TarArchiveEntry)TArkIS.getNextEntry();
>      while(TArkEntry != null){
>       if(!TArkEntry.isDirectory()){
>        System.err.println(TArkEntry);
> // __ org/apache/commons/compress/archivers/tar/TarArchiveEntry.html
>        System.err.println("// __ getName: |" + TArkEntry.getName() + "|");
>        System.err.println("// __ getSize: |" + TArkEntry.getSize() + "|");
>        System.err.println("// __ getUserId: |" + TArkEntry.getUserId() + "|");
>        System.err.println("// __ GroupId: |" + TArkEntry.getGroupId() + "|");
>        System.err.println("// __ GroupName: |" + TArkEntry.getGroupName() + "|");
>        System.err.println("// __ LastModifiedDate: |" + TArkEntry.getLastModifiedDate() + "|");
>        System.err.println("// __ LinkName: |" + TArkEntry.getLinkName() + "|");
>        System.err.println("// __ Mode: |" + TArkEntry.getMode() + "|");
>        System.err.println("// __ ModTime: |" + TArkEntry.getModTime() + "|");
>        TARFl = TArkEntry.getFile();
>        System.err.println("// __ File: |" + TARFl + "|");
>        if(TARFl != null){ System.err.println("~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~ * ~"); }
>        else{ System.err.println("~"); }
>       }
>       TArkEntry = (TarArchiveEntry)TArkIS.getNextEntry();
>      }
> // __ 
>      TArkIS.close();
>     }// (IFl.exists())
>     else{ System.err.println("// __ File not found! |" + aFlPth + "|"); }
>    }// i [0, aIFl.length)
>   }catch(FileNotFoundException FlNFX){ FlNFX.printStackTrace(System.err); }
>     catch(IOException IOX){ IOX.printStackTrace(System.err); }
>  }
> }

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