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SWCompression 4.9.1 Docs
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GzipHeader Structure Reference
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<a class="nav-group-task-link" href="../Structs/ZlibHeader/CompressionLevel.html">– CompressionLevel</a>
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<article class="main-content">
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<section class="section">
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<div class="section-content top-matter">
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<h1>GzipHeader</h1>
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<div class="declaration">
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<div class="language">
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<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">struct</span> <span class="kt">GzipHeader</span></code></pre>
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</div>
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</div>
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<p>Represents the header of a GZip archive.</p>
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<div class="slightly-smaller">
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<a href="https://github.com/tsolomko/SWCompression/tree/4.9.1/Sources/GZip/GzipHeader.swift#L10-L201">Show on GitHub</a>
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</div>
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<div class="task-group">
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<ul class="item-container">
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<li class="item">
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<div>
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<code>
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<a name="/s:13SWCompression10GzipHeaderV17compressionMethodAA011CompressionE0Ovp"></a>
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<a name="//apple_ref/swift/Property/compressionMethod" class="dashAnchor"></a>
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<a class="token" href="#/s:13SWCompression10GzipHeaderV17compressionMethodAA011CompressionE0Ovp">compressionMethod</a>
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</code>
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</div>
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<div class="height-container">
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<div class="pointer-container"></div>
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<section class="section">
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<div class="pointer"></div>
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<div class="abstract">
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<p>Compression method of archive. Always <code>.deflate</code> for GZip archives.</p>
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</div>
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<div class="declaration">
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<h4>Declaration</h4>
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<div class="language">
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<p class="aside-title">Swift</p>
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<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">compressionMethod</span><span class="p">:</span> <span class="kt"><a href="../Enums/CompressionMethod.html">CompressionMethod</a></span></code></pre>
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</div>
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</div>
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<div class="slightly-smaller">
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<a href="https://github.com/tsolomko/SWCompression/tree/4.9.1/Sources/GZip/GzipHeader.swift#L27">Show on GitHub</a>
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</div>
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</section>
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</div>
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</li>
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<li class="item">
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<div>
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<code>
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<a name="/s:13SWCompression10GzipHeaderV16modificationTime10Foundation4DateVSgvp"></a>
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<a name="//apple_ref/swift/Property/modificationTime" class="dashAnchor"></a>
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<a class="token" href="#/s:13SWCompression10GzipHeaderV16modificationTime10Foundation4DateVSgvp">modificationTime</a>
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</code>
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</div>
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<div class="height-container">
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<div class="pointer-container"></div>
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<section class="section">
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<div class="pointer"></div>
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<div class="abstract">
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<p>The most recent modification time of the original file. If corresponding archive’s field is set to 0, which means
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that no time was specified, then this property is <code>nil</code>.</p>
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</div>
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<div class="declaration">
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<h4>Declaration</h4>
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<div class="language">
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<p class="aside-title">Swift</p>
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<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">modificationTime</span><span class="p">:</span> <span class="kt">Date</span><span class="p">?</span></code></pre>
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</div>
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</div>
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||
<div class="slightly-smaller">
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<a href="https://github.com/tsolomko/SWCompression/tree/4.9.1/Sources/GZip/GzipHeader.swift#L33">Show on GitHub</a>
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</div>
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</section>
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</div>
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</li>
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<li class="item">
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<div>
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<code>
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<a name="/s:13SWCompression10GzipHeaderV6osTypeAA010FileSystemE0Ovp"></a>
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<a name="//apple_ref/swift/Property/osType" class="dashAnchor"></a>
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<a class="token" href="#/s:13SWCompression10GzipHeaderV6osTypeAA010FileSystemE0Ovp">osType</a>
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</code>
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</div>
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<div class="height-container">
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<div class="pointer-container"></div>
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<section class="section">
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<div class="pointer"></div>
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<div class="abstract">
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<p>Type of file system on which archivation took place.</p>
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</div>
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<div class="declaration">
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<h4>Declaration</h4>
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<div class="language">
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<p class="aside-title">Swift</p>
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<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">osType</span><span class="p">:</span> <span class="kt"><a href="../Enums/FileSystemType.html">FileSystemType</a></span></code></pre>
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</div>
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</div>
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||
<div class="slightly-smaller">
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||
<a href="https://github.com/tsolomko/SWCompression/tree/4.9.1/Sources/GZip/GzipHeader.swift#L36">Show on GitHub</a>
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||
</div>
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||
</section>
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||
</div>
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</li>
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<li class="item">
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<div>
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<code>
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||
<a name="/s:13SWCompression10GzipHeaderV8fileNameSSSgvp"></a>
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<a name="//apple_ref/swift/Property/fileName" class="dashAnchor"></a>
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<a class="token" href="#/s:13SWCompression10GzipHeaderV8fileNameSSSgvp">fileName</a>
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</code>
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</div>
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<div class="height-container">
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<div class="pointer-container"></div>
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<section class="section">
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<div class="pointer"></div>
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<div class="abstract">
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<p>Name of the original file. If archive doesn’t contain file’s name, then <code>nil</code>.</p>
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</div>
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<div class="declaration">
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<h4>Declaration</h4>
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<div class="language">
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<p class="aside-title">Swift</p>
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<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">fileName</span><span class="p">:</span> <span class="kt">String</span><span class="p">?</span></code></pre>
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</div>
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</div>
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||
<div class="slightly-smaller">
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||
<a href="https://github.com/tsolomko/SWCompression/tree/4.9.1/Sources/GZip/GzipHeader.swift#L39">Show on GitHub</a>
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||
</div>
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||
</section>
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||
</div>
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||
</li>
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<li class="item">
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<div>
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<code>
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<a name="/s:13SWCompression10GzipHeaderV7commentSSSgvp"></a>
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<a name="//apple_ref/swift/Property/comment" class="dashAnchor"></a>
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<a class="token" href="#/s:13SWCompression10GzipHeaderV7commentSSSgvp">comment</a>
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</code>
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||
</div>
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||
<div class="height-container">
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||
<div class="pointer-container"></div>
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<section class="section">
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||
<div class="pointer"></div>
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<div class="abstract">
|
||
<p>Comment stored in archive. If archive doesn’t contain any comment, then <code>nil</code>.</p>
|
||
|
||
</div>
|
||
<div class="declaration">
|
||
<h4>Declaration</h4>
|
||
<div class="language">
|
||
<p class="aside-title">Swift</p>
|
||
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">comment</span><span class="p">:</span> <span class="kt">String</span><span class="p">?</span></code></pre>
|
||
|
||
</div>
|
||
</div>
|
||
<div class="slightly-smaller">
|
||
<a href="https://github.com/tsolomko/SWCompression/tree/4.9.1/Sources/GZip/GzipHeader.swift#L42">Show on GitHub</a>
|
||
</div>
|
||
</section>
|
||
</div>
|
||
</li>
|
||
<li class="item">
|
||
<div>
|
||
<code>
|
||
<a name="/s:13SWCompression10GzipHeaderV10isTextFileSbvp"></a>
|
||
<a name="//apple_ref/swift/Property/isTextFile" class="dashAnchor"></a>
|
||
<a class="token" href="#/s:13SWCompression10GzipHeaderV10isTextFileSbvp">isTextFile</a>
|
||
</code>
|
||
</div>
|
||
<div class="height-container">
|
||
<div class="pointer-container"></div>
|
||
<section class="section">
|
||
<div class="pointer"></div>
|
||
<div class="abstract">
|
||
<p>True, if file is likely to be text file or ASCII-file.</p>
|
||
|
||
</div>
|
||
<div class="declaration">
|
||
<h4>Declaration</h4>
|
||
<div class="language">
|
||
<p class="aside-title">Swift</p>
|
||
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">isTextFile</span><span class="p">:</span> <span class="kt">Bool</span></code></pre>
|
||
|
||
</div>
|
||
</div>
|
||
<div class="slightly-smaller">
|
||
<a href="https://github.com/tsolomko/SWCompression/tree/4.9.1/Sources/GZip/GzipHeader.swift#L45">Show on GitHub</a>
|
||
</div>
|
||
</section>
|
||
</div>
|
||
</li>
|
||
<li class="item">
|
||
<div>
|
||
<code>
|
||
<a name="/s:13SWCompression10GzipHeaderV11extraFieldsSayAC10ExtraFieldVGvp"></a>
|
||
<a name="//apple_ref/swift/Property/extraFields" class="dashAnchor"></a>
|
||
<a class="token" href="#/s:13SWCompression10GzipHeaderV11extraFieldsSayAC10ExtraFieldVGvp">extraFields</a>
|
||
</code>
|
||
</div>
|
||
<div class="height-container">
|
||
<div class="pointer-container"></div>
|
||
<section class="section">
|
||
<div class="pointer"></div>
|
||
<div class="abstract">
|
||
<p>Extra fields present in the header.</p>
|
||
<div class="aside aside-note">
|
||
<p class="aside-title">Note</p>
|
||
This feature of the GZip format is extremely rarely used, so in vast majority of cases this property
|
||
contains an empty array.
|
||
|
||
</div>
|
||
|
||
</div>
|
||
<div class="declaration">
|
||
<h4>Declaration</h4>
|
||
<div class="language">
|
||
<p class="aside-title">Swift</p>
|
||
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">extraFields</span><span class="p">:</span> <span class="p">[</span><span class="kt"><a href="../Structs/GzipHeader/ExtraField.html">ExtraField</a></span><span class="p">]</span></code></pre>
|
||
|
||
</div>
|
||
</div>
|
||
<div class="slightly-smaller">
|
||
<a href="https://github.com/tsolomko/SWCompression/tree/4.9.1/Sources/GZip/GzipHeader.swift#L53">Show on GitHub</a>
|
||
</div>
|
||
</section>
|
||
</div>
|
||
</li>
|
||
<li class="item">
|
||
<div>
|
||
<code>
|
||
<a name="/s:13SWCompression10GzipHeaderV7archiveAC10Foundation4DataV_tKcfc"></a>
|
||
<a name="//apple_ref/swift/Method/init(archive:)" class="dashAnchor"></a>
|
||
<a class="token" href="#/s:13SWCompression10GzipHeaderV7archiveAC10Foundation4DataV_tKcfc">init(archive:<wbr>)</a>
|
||
</code>
|
||
</div>
|
||
<div class="height-container">
|
||
<div class="pointer-container"></div>
|
||
<section class="section">
|
||
<div class="pointer"></div>
|
||
<div class="abstract">
|
||
<p>Initializes the structure with the values from the first ‘member’ of GZip <code>archive</code>.</p>
|
||
<div class="aside aside-throws">
|
||
<p class="aside-title">Throws</p>
|
||
<p><code><a href="../Enums/GzipError.html">GzipError</a></code>. It may indicate that either archive is damaged or
|
||
it might not be archived with GZip at all.</p>
|
||
|
||
</div>
|
||
|
||
</div>
|
||
<div class="declaration">
|
||
<h4>Declaration</h4>
|
||
<div class="language">
|
||
<p class="aside-title">Swift</p>
|
||
<pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="n">archive</span> <span class="nv">data</span><span class="p">:</span> <span class="kt">Data</span><span class="p">)</span> <span class="k">throws</span></code></pre>
|
||
|
||
</div>
|
||
</div>
|
||
<div>
|
||
<h4>Parameters</h4>
|
||
<table class="graybox">
|
||
<tbody>
|
||
<tr>
|
||
<td>
|
||
<code>
|
||
<em>archive</em>
|
||
</code>
|
||
</td>
|
||
<td>
|
||
<div>
|
||
<p>Data archived with GZip.</p>
|
||
</div>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</div>
|
||
<div class="slightly-smaller">
|
||
<a href="https://github.com/tsolomko/SWCompression/tree/4.9.1/Sources/GZip/GzipHeader.swift#L63-L66">Show on GitHub</a>
|
||
</div>
|
||
</section>
|
||
</div>
|
||
</li>
|
||
<li class="item">
|
||
<div>
|
||
<code>
|
||
<a name="/s:13SWCompression10GzipHeaderV10ExtraFieldV"></a>
|
||
<a name="//apple_ref/swift/Struct/ExtraField" class="dashAnchor"></a>
|
||
<a class="token" href="#/s:13SWCompression10GzipHeaderV10ExtraFieldV">ExtraField</a>
|
||
</code>
|
||
</div>
|
||
<div class="height-container">
|
||
<div class="pointer-container"></div>
|
||
<section class="section">
|
||
<div class="pointer"></div>
|
||
<div class="abstract">
|
||
<p>Represents an extra field in the header of a GZip archive.</p>
|
||
|
||
<a href="../Structs/GzipHeader/ExtraField.html" class="slightly-smaller">See more</a>
|
||
</div>
|
||
<div class="declaration">
|
||
<h4>Declaration</h4>
|
||
<div class="language">
|
||
<p class="aside-title">Swift</p>
|
||
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">struct</span> <span class="kt">ExtraField</span></code></pre>
|
||
|
||
</div>
|
||
</div>
|
||
<div class="slightly-smaller">
|
||
<a href="https://github.com/tsolomko/SWCompression/tree/4.9.1/Sources/GZip/GzipHeader+ExtraField.swift#L9-L27">Show on GitHub</a>
|
||
</div>
|
||
</section>
|
||
</div>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
</section>
|
||
|
||
</article>
|
||
</div>
|
||
<section class="footer">
|
||
<p>© 2026 Timofey Solomko</p>
|
||
<p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external noopener">jazzy ♪♫ v0.15.4</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external noopener">Realm</a> project.</p>
|
||
</section>
|
||
</body>
|
||
</html>
|