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<h1 title="Package" class="title">Package&nbsp;org.apache.commons.compress.compressors.pack200</h1>
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<div class="block">Provides stream classes for compressing and decompressing
      streams using the Pack200 algorithm used to compress Java
      archives.</div>
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<p>See:&nbsp;<a href="#package_description">Description</a></p>
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<th class="colFirst" scope="col">Class</th>
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<td class="colFirst"><a href="../../../../../../org/apache/commons/compress/compressors/pack200/Pack200CompressorInputStream.html" title="class in org.apache.commons.compress.compressors.pack200">Pack200CompressorInputStream</a></td>
<td class="colLast">
<div class="block">An input stream that decompresses from the Pack200 format to be read
 as any other stream.</div>
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<td class="colFirst"><a href="../../../../../../org/apache/commons/compress/compressors/pack200/Pack200CompressorOutputStream.html" title="class in org.apache.commons.compress.compressors.pack200">Pack200CompressorOutputStream</a></td>
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<div class="block">An output stream that compresses using the Pack200 format.</div>
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<td class="colFirst"><a href="../../../../../../org/apache/commons/compress/compressors/pack200/Pack200Utils.html" title="class in org.apache.commons.compress.compressors.pack200">Pack200Utils</a></td>
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<div class="block">Utility methods for Pack200.</div>
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<td class="colFirst"><a href="../../../../../../org/apache/commons/compress/compressors/pack200/Pack200Strategy.html" title="enum in org.apache.commons.compress.compressors.pack200">Pack200Strategy</a></td>
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<div class="block">The different modes the Pack200 streams can use to wrap input and
 output.</div>
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<h2 title="Package org.apache.commons.compress.compressors.pack200 Description">Package org.apache.commons.compress.compressors.pack200 Description</h2>
<div class="block"><p>Provides stream classes for compressing and decompressing
      streams using the Pack200 algorithm used to compress Java
      archives.</p>

    <p>The streams of this package only work on JAR archives, i.e. a
      <a href="../../../../../../org/apache/commons/compress/compressors/pack200/Pack200CompressorOutputStream.html" title="class in org.apache.commons.compress.compressors.pack200"><code>Pack200CompressorOutputStream</code></a> expects to be wrapped around a
      stream that a valid JAR archive will be written to and a <a href="../../../../../../org/apache/commons/compress/compressors/pack200/Pack200CompressorInputStream.html" title="class in org.apache.commons.compress.compressors.pack200"><code>Pack200CompressorInputStream</code></a> provides a stream to read from a
      JAR archive.</p>

    <p>JAR archives compressed with Pack200 will in general be
      different from the original archive when decompressed again.
      For details see
      the <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/jar/Pack200.html">API
      documentation of Pack200</a>.</p>

    <p>The streams of this package work on non-deflated streams,
      i.e. archives like those created with the <code>--no-gzip</code>
      option of the JDK's <code>pack200</code> command line tool.  If
      you want to work on deflated streams you must use an additional
      stream layer - for example by using Apache Commons Compress'
      gzip package.</p>

    <p>The Pack200 API provided by the Java class library doesn't lend
      itself to real stream
      processing.  <code>Pack200CompressorInputStream</code> will
      uncompress its input immediately and then provide
      an <code>InputStream</code> to a cached result.
      Likewise <code>Pack200CompressorOutputStream</code> will not
      write anything to the given OutputStream
      until <code>finish</code> or <code>close</code> is called - at
      which point the cached output written so far gets
      compressed.</p>

    <p>Two different caching modes are available - "in memory", which
      is the default, and "temporary file".  By default data is cached
      in memory but you should switch to the temporary file option if
      your archives are really big.</p>

    <p>Given there always is an intermediate result
      the <code>getBytesRead</code> and <code>getCount</code> methods
      of <code>Pack200CompressorInputStream</code> are meaningless
      (read from the real stream or from the intermediate result?)
      and always return 0.</p>

    <p>During development of the initial version several attempts have
      been made to use a real streaming API based for example
      on <code>Piped(In|Out)putStream</code> or explicit stream
      pumping like Commons Exec's <code>InputStreamPumper</code> but
      they have all failed because they rely on the output end to be
      consumed completely or else the <code>(un)pack</code> will block
      forever.  Especially for <code>Pack200InputStream</code> it is
      very likely that it will be wrapped in
      a <code>ZipArchiveInputStream</code> which will never read the
      archive completely as it is not interested in the ZIP central
      directory data at the end of the JAR archive.</p></div>
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