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<h1 class="page-title">Archivers</h1>
<h2 id="archivers">Archivers</h2>
<p>ENiGMA½ can detect and process various archive formats such as zip and arj for a variety of tasks from file upload processing to EchoMail bundle compress/decompression. The <code class="language-plaintext highlighter-rouge">archives</code> section of <code class="language-plaintext highlighter-rouge">config.hjson</code> is used to override defaults, add new handlers, and so on.</p>
<p>Archivers are manged via the <code class="language-plaintext highlighter-rouge">archives:archivers</code> configuration block of <code class="language-plaintext highlighter-rouge">config.hjson</code>. Each entry in this section defines an <strong>external archiver</strong> that can be referenced in other sections of <code class="language-plaintext highlighter-rouge">config.hjson</code> as and in code. Entries define how to <code class="language-plaintext highlighter-rouge">compress</code>, <code class="language-plaintext highlighter-rouge">decompress</code> (a full archive), <code class="language-plaintext highlighter-rouge">list</code>, and <code class="language-plaintext highlighter-rouge">extract</code> (specific files from an archive).</p>
<blockquote>
<p><img class="emoji" title=":bulb:" alt=":bulb:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f4a1.png" height="20" width="20"> Generally you do not need to anything beyond installing supporting binaries. No <code class="language-plaintext highlighter-rouge">config.hjson</code> editing necessary; Please see <a href="/enigma-bbs/configuration/external-binaries.html">External Binaries</a>!</p>
</blockquote>
<h3 id="archiver-configuration">Archiver Configuration</h3>
<p>Archiver entries in <code class="language-plaintext highlighter-rouge">config.hjson</code> are mostly self explanatory with the exception of <code class="language-plaintext highlighter-rouge">list</code> commands that require some additional information. The <code class="language-plaintext highlighter-rouge">args</code> member for an entry is an array of arguments to pass to <code class="language-plaintext highlighter-rouge">cmd</code>. Some variables are available to <code class="language-plaintext highlighter-rouge">args</code> that will be expanded by the system:</p>
<ul>
<li>
<code class="language-plaintext highlighter-rouge">{archivePath}</code> (all): Path to the archive</li>
<li>
<code class="language-plaintext highlighter-rouge">{fileList}</code> (compress, extract): List of file(s) to compress or extract</li>
<li>
<code class="language-plaintext highlighter-rouge">{extractPath}</code> (decompress, extract): Path to extract <em>to</em>
</li>
</ul>
<p>For <code class="language-plaintext highlighter-rouge">list</code> commands, the <code class="language-plaintext highlighter-rouge">entryMatch</code> key must be provided. This key should provide a regular expression that matches two sub groups: One for uncompressed file byte sizes (sub group 1) and the other for file names (sub group 2). An optional <code class="language-plaintext highlighter-rouge">entryGroupOrder</code> can be supplied to change the default sub group order.</p>
<h4 id="example-archiver-configuration">Example Archiver Configuration</h4>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>7Zip: {
compress: {
cmd: 7za,
args: [ "a", "-tzip", "{archivePath}", "{fileList}" ]
}
decompress: {
cmd: 7za,
args: [ "e", "-o{extractPath}", "{archivePath}" ]
}
list: {
cmd: 7za,
args: [ "l", "{archivePath}" ]
entryMatch: "^[0-9]{4}-[0-9]{2}-[0-9]{2}\\s[0-9]{2}:[0-9]{2}:[0-9]{2}\\s[A-Za-z\\.]{5}\\s+([0-9]+)\\s+[0-9]+\\s+([^\\r\\n]+)$",
}
extract: {
cmd: 7za,
args [ "e", "-o{extractPath}", "{archivePath}", "{fileList}" ]
}
}
</code></pre></div></div>
<h2 id="archive-formats">Archive Formats</h2>
<p>Archive formats can be defined such that ENiGMA½ can detect them by signature or extension, then utilize the correct <em>archiver</em> to process them. Formats are defined in the <code class="language-plaintext highlighter-rouge">archives:formats</code> key in <code class="language-plaintext highlighter-rouge">config.hjson</code>. Many differnet types come pre-configured (see <code class="language-plaintext highlighter-rouge">core/config_default.js</code>).</p>
<h3 id="example-archive-format-configuration">Example Archive Format Configuration</h3>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>zip: {
sig: "504b0304" /* byte signature in HEX */
offset: 0
exts: [ "zip" ]
handler: 7Zip /* points to a defined archiver */
desc: "ZIP Archive"
}
</code></pre></div></div>
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