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  <h1>Source code for PIL.TarIO</h1><div class="highlight"><pre>
<span class="c">#</span>
<span class="c"># The Python Imaging Library.</span>
<span class="c"># $Id$</span>
<span class="c">#</span>
<span class="c"># read files from within a tar file</span>
<span class="c">#</span>
<span class="c"># History:</span>
<span class="c"># 95-06-18 fl   Created</span>
<span class="c"># 96-05-28 fl   Open files in binary mode</span>
<span class="c">#</span>
<span class="c"># Copyright (c) Secret Labs AB 1997.</span>
<span class="c"># Copyright (c) Fredrik Lundh 1995-96.</span>
<span class="c">#</span>
<span class="c"># See the README file for information on usage and redistribution.</span>
<span class="c">#</span>

<span class="kn">from</span> <span class="nn">PIL</span> <span class="kn">import</span> <span class="n">ContainerIO</span>

<span class="c">##</span>
<span class="c"># A file object that provides read access to a given member of a TAR</span>
<span class="c"># file.</span>

<div class="viewcode-block" id="TarIO"><a class="viewcode-back" href="../../PIL.html#PIL.TarIO.TarIO">[docs]</a><span class="k">class</span> <span class="nc">TarIO</span><span class="p">(</span><span class="n">ContainerIO</span><span class="o">.</span><span class="n">ContainerIO</span><span class="p">):</span>

    <span class="c">##</span>
    <span class="c"># Create file object.</span>
    <span class="c">#</span>
    <span class="c"># @param tarfile Name of TAR file.</span>
    <span class="c"># @param file Name of member file.</span>

    <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">tarfile</span><span class="p">,</span> <span class="nb">file</span><span class="p">):</span>

        <span class="n">fh</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">tarfile</span><span class="p">,</span> <span class="s">&quot;rb&quot;</span><span class="p">)</span>

        <span class="k">while</span> <span class="bp">True</span><span class="p">:</span>

            <span class="n">s</span> <span class="o">=</span> <span class="n">fh</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="mi">512</span><span class="p">)</span>
            <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">512</span><span class="p">:</span>
                <span class="k">raise</span> <span class="ne">IOError</span><span class="p">(</span><span class="s">&quot;unexpected end of tar file&quot;</span><span class="p">)</span>

            <span class="n">name</span> <span class="o">=</span> <span class="n">s</span><span class="p">[:</span><span class="mi">100</span><span class="p">]</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s">&#39;utf-8&#39;</span><span class="p">)</span>
            <span class="n">i</span> <span class="o">=</span> <span class="n">name</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="s">&#39;</span><span class="se">\0</span><span class="s">&#39;</span><span class="p">)</span>
            <span class="k">if</span> <span class="n">i</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
                <span class="k">raise</span> <span class="ne">IOError</span><span class="p">(</span><span class="s">&quot;cannot find subfile&quot;</span><span class="p">)</span>
            <span class="k">if</span> <span class="n">i</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">:</span>
                <span class="n">name</span> <span class="o">=</span> <span class="n">name</span><span class="p">[:</span><span class="n">i</span><span class="p">]</span>

            <span class="n">size</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">124</span><span class="p">:</span><span class="mi">135</span><span class="p">],</span> <span class="mi">8</span><span class="p">)</span>

            <span class="k">if</span> <span class="nb">file</span> <span class="o">==</span> <span class="n">name</span><span class="p">:</span>
                <span class="k">break</span>

            <span class="n">fh</span><span class="o">.</span><span class="n">seek</span><span class="p">((</span><span class="n">size</span> <span class="o">+</span> <span class="mi">511</span><span class="p">)</span> <span class="o">&amp;</span> <span class="p">(</span><span class="o">~</span><span class="mi">511</span><span class="p">),</span> <span class="mi">1</span><span class="p">)</span>

        <span class="c"># Open region</span>
        <span class="n">ContainerIO</span><span class="o">.</span><span class="n">ContainerIO</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">fh</span><span class="p">,</span> <span class="n">fh</span><span class="o">.</span><span class="n">tell</span><span class="p">(),</span> <span class="n">size</span><span class="p">)</span></div>
</pre></div>

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