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Timofey Solomko
469 lines
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469 lines
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<a class="nav-group-task-link" href="Protocols/DecompressionAlgorithm.html">DecompressionAlgorithm</a>
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<article class="main-content">
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<section class="section">
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<div class="section-content">
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<h1 id='swcompression' class='heading'>SWCompression</h1>
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<p><a href="https://raw.githubusercontent.com/tsolomko/SWCompression/master/LICENSE"><img src="https://img.shields.io/badge/license-MIT-lightgrey.svg" alt="GitHub license"></a>
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<a href="https://cocoapods.org/pods/SWCompression"><img src="https://img.shields.io/cocoapods/p/SWCompression.svg" alt="CocoaPods"></a>
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<a href="https://developer.apple.com/swift/"><img src="https://img.shields.io/badge/Swift-3.1.1-lightgrey.svg" alt="Swift 3"></a>
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<a href="https://travis-ci.org/tsolomko/SWCompression"><img src="https://travis-ci.org/tsolomko/SWCompression.svg?branch=develop" alt="Build Status"></a>
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<a href="https://codeclimate.com/github/tsolomko/SWCompression/coverage"><img src="https://codeclimate.com/github/tsolomko/SWCompression/badges/coverage.svg" alt="Test Coverage"></a></p>
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<p><a href="https://cocoapods.org/pods/SWCompression"><img src="https://img.shields.io/cocoapods/v/SWCompression.svg" alt="CocoaPods"></a>
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<a href="https://github.com/Carthage/Carthage"><img src="https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat" alt="Carthage compatible"></a></p>
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<p>A framework which contains implementations of (de)compression algorithms and functions which parse various archives and containers.</p>
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<p><strong>Developed with Swift.</strong></p>
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<h2 id='motivation' class='heading'>Motivation</h2>
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<p>There are a couple of reasons for the project’s development.</p>
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<p>The main reason is that it is very educational.</p>
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<p>Secondly, if you are a Swift developer and you want to compress/decompress something in your project
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you have to use either wrapper around system libraries (which is probably written in Objective-C)
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or you have to use built-in Compression framework.
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You might think that last option is what you need, but, frankly
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that framework has a bit complicated API and somewhat questionable choice of supported compression algorithms.
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And yes, it is also in Objective-C.</p>
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<p>And here comes SWCompression: no Objective-C, pure Swift.</p>
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<h2 id='features' class='heading'>Features</h2>
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<ul>
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<li>Containers:
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<ul>
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<li>ZIP</li>
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<li>TAR</li>
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<li>7-Zip</li>
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</ul></li>
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<li>Decompression algorithms:
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<ul>
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<li>LZMA/LZMA2</li>
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<li>Deflate</li>
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<li>BZip2</li>
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</ul></li>
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<li>Compression algorithms:
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<ul>
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<li>Deflate</li>
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<li>BZip2</li>
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</ul></li>
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<li>Archives:
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<ul>
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<li>XZ</li>
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<li>GZip</li>
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<li>Zlib</li>
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</ul></li>
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<li>Platform independent.</li>
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<li><em>Written with Swift only.</em></li>
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</ul>
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<p>By the way, it seems like GZip, Deflate and Zlib implementations are <strong>specification compliant</strong>.</p>
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<h2 id='installation' class='heading'>Installation</h2>
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<p>SWCompression can be integrated into your project either using CocoaPods, Carthage or Swift Package Manager.</p>
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<h3 id='cocoapods' class='heading'>CocoaPods</h3>
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<p>Add to your Podfile <code>pod 'SWCompression'</code>.</p>
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<p>There are several sub-podspecs in case you need only parts of framework’s functionality.
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Available subspecs:</p>
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<ul>
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<li>SWCompression/LZMA</li>
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<li>SWCompression/XZ</li>
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<li>SWCompression/Deflate</li>
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<li>SWCompression/Gzip</li>
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<li>SWCompression/Zlib</li>
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<li>SWCompression/BZip2</li>
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<li>SWCompression/ZIP</li>
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<li>SWCompression/TAR</li>
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<li>SWCompression/SevenZip</li>
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</ul>
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<p>You can add some or all of them instead of <code>pod 'SWCompression'</code></p>
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<p>Also, do not forget to include <code>use_frameworks!</code> line in your Podfile.</p>
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<p>To complete installation, run <code>pod install</code>.</p>
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<h3 id='carthage' class='heading'>Carthage</h3>
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<p>Add to your Cartfile <code>github "tsolomko/SWCompression"</code>.</p>
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<p>Then run <code>carthage update</code>.</p>
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<p>Finally, drag and drop <code>SWCompression.framework</code> from <code>Carthage/Build</code> folder
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into the <q>Embedded Binaries</q> section on your targets’ <q>General</q> tab.</p>
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<h3 id='swift-package-manager' class='heading'>Swift Package Manager</h3>
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<p>Add to you package dependecies <code>.Package(url: "https://github.com/tsolomko/SWCompression.git")</code>,
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for example like this:</p>
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<pre class="highlight swift"><code><span class="kd">import</span> <span class="kt">PackageDescription</span>
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<span class="k">let</span> <span class="nv">package</span> <span class="o">=</span> <span class="kt">Package</span><span class="p">(</span>
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<span class="nv">name</span><span class="p">:</span> <span class="s">"PackageName"</span><span class="p">,</span>
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<span class="nv">dependencies</span><span class="p">:</span> <span class="p">[</span>
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<span class="o">.</span><span class="kt">Package</span><span class="p">(</span><span class="nv">url</span><span class="p">:</span> <span class="s">"https://github.com/tsolomko/SWCompression.git"</span><span class="p">,</span> <span class="nv">majorVersion</span><span class="p">:</span> <span class="mi">3</span><span class="p">)</span>
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<span class="p">]</span>
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<span class="p">)</span>
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</code></pre>
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<p>More info about SPM you can find at <a href="https://github.com/apple/swift-package-manager/tree/master/Documentation">Swift Package Manager’s Documentation</a>.</p>
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<h2 id='options-for-cocoapods-users' class='heading'>Options for CocoaPods users</h2>
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<p>Both ZIP and 7-Zip containers have compression method
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which is most likely to be used when compressing files into them.
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This is Deflate for ZIP and LZMA/LZMA2 for 7-Zip.
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Thus, SWCompression/ZIP subspec have SWCompression/Deflate subspec as a dependency
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and SWCompression/LZMA subspec as a dependency for SWCompression/SevenZip.</p>
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<p>But both these containers support other compression methods,
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some of them are implemented in SWCompression.
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For CocoaPods configurations some sort of ‘optional dependecies’ are provided for such compression methods.</p>
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<p>‘Optional dependency’ in this context means
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that SWCompression/ZIP or SWCompression/7-Zip will support particular compression methods
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only if a corresponding subspec is expicitly specified in your Podfile and installed.</p>
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<p><strong>List of ‘optional dependecies’.</strong></p>
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<p>For SWCompression/ZIP:</p>
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<ul>
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<li>SWCompression/BZip2</li>
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<li>SWCompression/LZMA</li>
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</ul>
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<p>For SWCompression/SevenZip:</p>
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<ul>
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<li>SWCompression/BZip2</li>
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<li>SWCompression/Deflate</li>
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</ul>
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<p><strong>Note:</strong> If you use Carthage or Swift Package Manager you always have the full package,
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and ZIP will be built with both additional BZip2 and LZMA support
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as well as 7-Zip will be build with both additional Deflate and BZip2 support.</p>
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<h2 id='usage' class='heading'>Usage</h2>
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<h3 id='basics' class='heading'>Basics</h3>
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<p>If you’d like to decompress <q>deflated</q> data just use:</p>
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<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">data</span> <span class="o">=</span> <span class="k">try!</span> <span class="kt">Data</span><span class="p">(</span><span class="nv">contentsOf</span><span class="p">:</span> <span class="kt">URL</span><span class="p">(</span><span class="nv">fileURLWithPath</span><span class="p">:</span> <span class="s">"path/to/file"</span><span class="p">),</span>
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<span class="nv">options</span><span class="p">:</span> <span class="o">.</span><span class="n">mappedIfSafe</span><span class="p">)</span>
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<span class="k">let</span> <span class="nv">decompressedData</span> <span class="o">=</span> <span class="k">try</span><span class="p">?</span> <span class="kt">Deflate</span><span class="o">.</span><span class="nf">decompress</span><span class="p">(</span><span class="nv">data</span><span class="p">:</span> <span class="n">data</span><span class="p">)</span>
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</code></pre>
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<p><em>Note:</em> It is <strong>highly recommended</strong> to specify <code>Data.ReadingOptions.mappedIfSafe</code>,
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especially if you are working with large files, so you don’t run out of system memory.</p>
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<p>However, it is unlikely that you will encounter deflated data outside of any archive.
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So, in case of GZip archive you should use:</p>
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<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">decompressedData</span> <span class="o">=</span> <span class="k">try</span><span class="p">?</span> <span class="kt">GzipArchive</span><span class="o">.</span><span class="nf">unarchive</span><span class="p">(</span><span class="nv">archiveData</span><span class="p">:</span> <span class="n">data</span><span class="p">)</span>
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</code></pre>
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<p>One final note: every SWCompression function can throw an error and
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you are responsible for handling them.</p>
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<h3 id='documentation' class='heading'>Documentation</h3>
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<p>Every function or class of public API of SWCompression is documented.
|
||
This documentation can be found at its own <a href="http://tsolomko.github.io/SWCompression">website</a>.</p>
|
||
<h3 id='handling-errors' class='heading'>Handling Errors</h3>
|
||
|
||
<p>If you look at list of available error types and their cases, you may be frightened by their number.
|
||
However, most of these cases (such as <code><a href="Enums/XZError.html#/s:13SWCompression7XZErrorO10wrongMagicA2CmF">XZError.wrongMagic</a></code>) exist for diagnostic purposes.</p>
|
||
|
||
<p>Thus, you only need to handle the most common type of error for your archive/algorithm.
|
||
For example:</p>
|
||
<pre class="highlight swift"><code><span class="k">do</span> <span class="p">{</span>
|
||
<span class="k">let</span> <span class="nv">data</span> <span class="o">=</span> <span class="k">try</span> <span class="kt">Data</span><span class="p">(</span><span class="nv">contentsOf</span><span class="p">:</span> <span class="kt">URL</span><span class="p">(</span><span class="nv">fileURLWithPath</span><span class="p">:</span> <span class="s">"path/to/file"</span><span class="p">),</span>
|
||
<span class="nv">options</span><span class="p">:</span> <span class="o">.</span><span class="n">mappedIfSafe</span><span class="p">)</span>
|
||
<span class="k">let</span> <span class="nv">decompressedData</span> <span class="o">=</span> <span class="kt">XZArchive</span><span class="o">.</span><span class="nf">unarchive</span><span class="p">(</span><span class="nv">archive</span><span class="p">:</span> <span class="n">data</span><span class="p">)</span>
|
||
<span class="p">}</span> <span class="k">catch</span> <span class="k">let</span> <span class="nv">error</span> <span class="k">as</span> <span class="kt">XZError</span> <span class="p">{</span>
|
||
<span class="o"><</span><span class="n">handle</span> <span class="kt">XZ</span> <span class="n">related</span> <span class="n">error</span> <span class="n">here</span><span class="o">></span>
|
||
<span class="p">}</span> <span class="k">catch</span> <span class="k">let</span> <span class="nv">error</span> <span class="p">{</span>
|
||
<span class="o"><</span><span class="n">handle</span> <span class="n">all</span> <span class="n">other</span> <span class="n">errors</span> <span class="n">here</span><span class="o">></span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<h3 id='sophisticated-example' class='heading'>Sophisticated example</h3>
|
||
|
||
<p>There is a small program, <a href="https://github.com/tsolomko/swcomp">swcomp</a>,
|
||
which uses SWCompression for unarchiving several types of archives.</p>
|
||
<h2 id='performace' class='heading'>Performace</h2>
|
||
|
||
<p>Usage of whole module optimizations is recommended for best performance.
|
||
These optimizations are enabled by default for Release configurations.</p>
|
||
|
||
<p><a href="Tests/Results.md">Tests Results</a> document contains results of performance testing of various algorithms.</p>
|
||
<h2 id='running-tests-locally' class='heading'>Running tests locally</h2>
|
||
|
||
<p>If you want to run tests locally you need to clone this repository and do some additional steps:</p>
|
||
<pre class="highlight shell"><code>git submodule update --init --recursive
|
||
<span class="nb">cd </span>Tests/Test<span class="se">\ </span>Files
|
||
git lfs pull
|
||
</code></pre>
|
||
|
||
<p>These commands fetch example archives and other files which are used for testing.
|
||
These files are stored in a <a href="https://github.com/tsolomko/SWCompression-Test-Files">separate repository</a>.
|
||
Git LFS is also used for storing them which basically is the reason for having them in other repository.
|
||
Otherwise, using Swift Package Manager to install SWCompression is a bit challenging
|
||
(requires installing git-lfs <em>locally</em> with <code>--skip-smudge</code> option to solve the problem).</p>
|
||
<h2 id='known-issues' class='heading'>Known issues</h2>
|
||
|
||
<ul>
|
||
<li><code>wrongCRC</code> and <code>wrongCheck</code> errors for XZ and GZip multi-member archives
|
||
contain only last member’s data as their associated value instead of all successfully processed members.</li>
|
||
</ul>
|
||
|
||
<p>Comment: Philosophy for such errors is that by the time these errors are thrown,
|
||
decompression was already performed, so we can still provide the result of decompression to the caller.
|
||
It is intended to fix this problem, but solution requires backwards-incompatible API changes so it is delayed until 4.0 release.</p>
|
||
<h2 id='future-plans' class='heading'>Future plans</h2>
|
||
|
||
<ul>
|
||
<li>Container API rework.</li>
|
||
<li>Better Deflate compression.</li>
|
||
<li>Something else…</li>
|
||
</ul>
|
||
<h2 id='references' class='heading'>References</h2>
|
||
|
||
<ul>
|
||
<li><a href="http://www.paul.sladen.org/projects/pyflate/">pyflate</a></li>
|
||
<li><a href="https://www.ietf.org/rfc/rfc1951.txt">Deflate specification</a></li>
|
||
<li><a href="https://www.ietf.org/rfc/rfc1952.txt">GZip specification</a></li>
|
||
<li><a href="https://www.ietf.org/rfc/rfc1950.txt">Zlib specfication</a></li>
|
||
<li><a href="http://www.7-zip.org/sdk.html">LZMA SDK and specification</a></li>
|
||
<li><a href="http://tukaani.org/xz/xz-file-format-1.0.4.txt">XZ specification</a></li>
|
||
<li><a href="https://en.wikipedia.org/wiki/Lempel%E2%80%93Ziv%E2%80%93Markov_chain_algorithm">Wikipedia article about LZMA</a></li>
|
||
<li><a href="http://www.pkware.com/appnote">.ZIP Application Note</a></li>
|
||
<li><a href="http://www.iso.org/iso/catalogue_detail.htm?csnumber=60101">ISO/IEC 21320-1</a></li>
|
||
<li><a href="https://opensource.apple.com/source/zip/zip-6/unzip/unzip/proginfo/extra.fld">List of defined ZIP extra fields</a></li>
|
||
<li><a href="https://en.wikipedia.org/wiki/Tar_(computing)">Wikipedia article about TAR</a></li>
|
||
<li><a href="http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html">Pax specification</a></li>
|
||
<li><a href="https://www.gnu.org/software/tar/manual/html_node/Standard.html">Basic TAR specification</a></li>
|
||
<li><a href="https://commons.apache.org/proper/commons-compress/">Apache Commons Compress</a></li>
|
||
<li><a href="http://zork.net/%7Est/jottings/sais.html">A walk through the SA-IS Suffix Array Construction Algorithm</a></li>
|
||
<li><a href="https://en.wikipedia.org/wiki/Bzip2">Wikipedia article about BZip2</a></li>
|
||
</ul>
|
||
|
||
</div>
|
||
</section>
|
||
|
||
|
||
</article>
|
||
</div>
|
||
<section class="footer">
|
||
<p>© 2017 Timofey Solomko</p>
|
||
<p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.8.4</a>, a <a class="link" href="http://realm.io" target="_blank" rel="external">Realm</a> project.</p>
|
||
</section>
|
||
</body>
|
||
</div>
|
||
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