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From "Stefan Bodewig (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (COMPRESS-189) ZipArchiveInputStream may read 0 bytes when reading from a nested Zip file
Date Fri, 28 Dec 2012 06:56:13 GMT

     [ https://issues.apache.org/jira/browse/COMPRESS-189?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Stefan Bodewig resolved COMPRESS-189.
-------------------------------------

       Resolution: Fixed
    Fix Version/s: 1.5

Many thanks for the analysis.

fixed with svn revision 1426417.

Can we ship the test ZIP as part of Commons Compress' source distribution under the Apache
License or does it contain sensitive information?

Your original code works if you use the stream directly without a BufferedInputStream, BTW.
                
> ZipArchiveInputStream may read 0 bytes when reading from a nested Zip file
> --------------------------------------------------------------------------
>
>                 Key: COMPRESS-189
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-189
>             Project: Commons Compress
>          Issue Type: Bug
>          Components: Archivers
>    Affects Versions: 1.4.1
>         Environment: JDK 1.6 64-bit, Windows 7
>            Reporter: Daniel Lowe
>            Priority: Blocker
>             Fix For: 1.5
>
>
> When the following code is run an error "Underlying input stream returned zero bytes"
is produced. If the commented line is uncommented it can be seen that the ZipArchiveInputStream
returned 0 bytes. This only happens the first time read is called, subsequent calls work as
expected i.e. the following code actually works correctly with that line uncommented!
> The zip file used to produce this behavious is available at http://wwmm.ch.cam.ac.uk/~dl387/test.ZIP
> If this is not the correct way of processing a zip file of zip files please let me know.
Also I believe whilst ZipFile can iterate over entries fast due to being able to look at the
master table whilst ZipArchiveInputStream cannot. Is there anyway of instantiating a ZipFile
from a zip file inside another zip file without first extracting the nested zip file?
>     ZipFile zipFile = new ZipFile("C:/test.ZIP");
>     for (Enumeration<ZipArchiveEntry> iterator = zipFile.getEntries(); iterator.hasMoreElements();
) {
>       ZipArchiveEntry entry = iterator.nextElement();
>       InputStream is = new BufferedInputStream(zipFile.getInputStream(entry));
>       ZipArchiveInputStream zipInput = new ZipArchiveInputStream(is);
>       ZipArchiveEntry innerEntry;
>       while ((innerEntry = zipInput.getNextZipEntry()) != null){
>         if (innerEntry.getName().endsWith("XML")){
>           //zipInput.read();
>           System.out.println(IOUtils.toString(zipInput));
>         }
>       }
>     }

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