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<h2><a name="unzip">Unjar/Untar/Unwar/Unzip</a></h2>
<h3>Description</h3>
<p>Unzips a zip-, war-, or jar file.</p>
<p><a href="../CoreTypes/patternset.html">PatternSet</a>s are used to select files to extract
<I>from</I> the archive.  If no patternset is used, all files are extracted.
</p>

<p><a href="../CoreTypes/resources.html#collection">Resource
Collection</a>s may be used to select archived files to perform
unarchival upon.  Only file system based resource collections are
supported by Unjar/Unwar/Unzip, this includes <a
href="../CoreTypes/fileset.html">fileset</a>, <a
href="../CoreTypes/filelist.html">filelist</a>, <a
href="../using.html#path">path</a>, and <a
href="../CoreTypes/resources.html#files">files</a>.
Untar supports arbitrary resource collections.
Prior to Ant 1.7 only fileset has been supported as a nested element.</p>

<p>You can define filename transformations by using a nested <a href="../CoreTypes/mapper.html">mapper</a> element.  The default mapper is the
<a href="../CoreTypes/mapper.html#identity-mapper">identity mapper</a>.
</p>
<p>File permissions will not be restored on extracted files.</p>
<p>The untar task recognizes the long pathname entries used by GNU tar.<p>

<p><b>Please note</b> that different ZIP tools handle timestamps
differently when it comes to applying timezone offset calculations of
files.  Some ZIP libraries will store the timestamps as they've been
read from the filesystem while others will modify the timestamps both
when reading and writing the files to make all timestamps use the same
timezone.  A ZIP archive created by one library may extract files with
"wrong timestamps" when extracted by another library.</p>

<p>Ant's ZIP classes use the same algorithm as the InfoZIP tools and
zlib (timestamps get adjusted), Windows' "compressed folders" function
and WinZIP don't change the timestamps.  This means that using the
unzip task on files created by Windows' compressed folders function
may create files with timestamps that are "wrong", the same is true if
you use Windows' functions to extract an Ant generated ZIP
archive.</p>


<h3>Parameters</h3>
<table border="1" cellpadding="2" cellspacing="0">
  <tr>
    <td valign="top"><b>Attribute</b></td>
    <td valign="top"><b>Description</b></td>
    <td align="center" valign="top"><b>Required</b></td>
  </tr>
  <tr>
    <td valign="top">src</td>
    <td valign="top">archive file to expand.</td>
    <td align="center" valign="top">Yes, if filesets are not used.</td>
  </tr>
  <tr>
    <td valign="top">dest</td>
    <td valign="top">directory where to store the expanded files.</td>
    <td align="center" valign="top">Yes</td>
  </tr>
  <tr>
    <td valign="top">overwrite</td>
    <td valign="top">Overwrite files, even if they are newer than the
      corresponding entries in the archive (true or false, default is
      true).</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">compression</td>
    <td valign="top"><b>Note:</b> This attribute is only available for
    the <code>untar</code> task.<br>
    compression method.  Allowable values are &quot;none&quot;,
    &quot;gzip&quot; and &quot;bzip2&quot;.  Default is
    &quot;none&quot;.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">encoding</td>
    <td valign="top"><b>Note:</b> This attribute is not available for
    the <code>untar</code> task.<br>
    The character encoding that has been used for filenames
    inside the zip file.  For a list of possible values see <a
    href="http://java.sun.com/j2se/1.5.0/docs/guide/intl/encoding.doc.html">http://java.sun.com/j2se/1.5.0/docs/guide/intl/encoding.doc.html</a>.<br>
    Defaults to &quot;UTF8&quot;, use the magic value
    <code>native-encoding</code> for the platform's default character
    encoding.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">failOnEmptyArchive</td>
    <td valign="top">whether trying to extract an empty archive is an
      error. <em>since Ant 1.8.0</em></td>
    <td valign="top" align="center">No, defaults to false</td>
  </tr>
  <tr>
    <td valign="top">stripAbsolutePathSpec</td>
    <td valign="top">whether Ant should remove leading '/' or '\'
      characters from the extracted file name before extracing it.
      Note that this changes the entry's name before applying
      include/exclude patterns and before using the nested mappers (if
      any).  <em>since Ant 1.8.0</em></td>
    <td valign="top" align="center">No, defaults to false</td>
  </tr>
</table>
<h3>Examples</h3>
<pre>
&lt;unzip src=&quot;${tomcat_src}/tools-src.zip&quot; dest=&quot;${tools.home}&quot;/&gt;
</pre>
<p>
<pre>
&lt;gunzip src=&quot;tools.tar.gz&quot;/&gt;
&lt;untar src=&quot;tools.tar&quot; dest=&quot;${tools.home}&quot;/&gt;
</pre>
<pre>
&lt;unzip src=&quot;${tomcat_src}/tools-src.zip&quot;
       dest=&quot;${tools.home}&quot;&gt;
    &lt;patternset&gt;
        &lt;include name=&quot;**/*.java&quot;/&gt;
        &lt;exclude name=&quot;**/Test*.java&quot;/&gt;
    &lt;/patternset&gt;
&lt;/unzip&gt;
</pre>
<p>
<pre>
&lt;unzip dest=&quot;${tools.home}&quot;&gt;
    &lt;patternset&gt;
        &lt;include name=&quot;**/*.java&quot;/&gt;
        &lt;exclude name=&quot;**/Test*.java&quot;/&gt;
    &lt;/patternset&gt;
    &lt;fileset dir=&quot;.&quot;&gt;
        &lt;include name=&quot;**/*.zip&quot;/&gt;
        &lt;exclude name=&quot;**/tmp*.zip&quot;/&gt;
    &lt;/fileset&gt;
&lt;/unzip&gt;
</pre>
<p>
<pre>
&lt;unzip src=&quot;apache-ant-bin.zip&quot; dest=&quot;${tools.home}&quot;&gt;
    &lt;patternset&gt;
        &lt;include name=&quot;apache-ant/lib/ant.jar&quot;/&gt;
    &lt;/patternset&gt;
    &lt;mapper type=&quot;flatten&quot;/&gt;
&lt;/unzip&gt;
</pre>

<h3>Related tasks</h3>

<pre>
&lt;unzip src="some-archive" dest="some-dir"&gt;
  &lt;patternset&gt;
    &lt;include name="some-pattern"/&gt;
  &lt;/patternset&gt;
  &lt;mapper type=&quot;some-mapper&quot;/&gt;
&lt;/unzip&gt;
</pre>

is identical to

<pre>
&lt;copy todir="some-dir" preservelastmodified="true"&gt;
  &lt;zipfileset src="some-archive"&gt;
    &lt;patternset&gt;
      &lt;include name="some-pattern"/&gt;
    &lt;/patternset&gt;
  &lt;/zipfileset&gt;
  &lt;mapper type=&quot;some-mapper&quot;/&gt;
&lt;/copy&gt;
</pre>

<p>The same is also true for <code>&lt;untar&gt;</code> and
<code>&lt;tarfileset&gt;</code>.  <code>&lt;copy&gt;</code> offers
additional features like <a href="../CoreTypes/filterchain.html">filtering files</a> on the fly,
allowing a file to be mapped to multiple destinations or a
configurable file system timestamp granularity.</p>

<pre>&lt;zip destfile=&quot;new.jar&quot;&gt;
  &lt;zipfileset src=&quot;old.jar&quot;&gt;
    &lt;exclude name=&quot;do/not/include/this/class&quot;/&gt;
  &lt;/zipfileset&gt;
&lt;/zip&gt;
</pre>
<p>&quot;Deletes&quot; files from a zipfile.</p>


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