mrkad
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php-qrcode
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    <article class="phpdocumentor-element -class">
        <h2 class="phpdocumentor-content__title">
    ReedSolomonDecoder

    
            <div class="phpdocumentor-element__package">
            in package
            <ul class="phpdocumentor-breadcrumbs">
                                    <li class="phpdocumentor-breadcrumb"><a href="packages/Application.html">Application</a></li>
                            </ul>
        </div>
    
    
    </h2>

        <aside class="phpdocumentor-element-found-in">
    <abbr class="phpdocumentor-element-found-in__file" title="src/Common/ReedSolomonDecoder.php"><a href="files/src-common-reedsolomondecoder.html"><abbr title="src/Common/ReedSolomonDecoder.php">ReedSolomonDecoder.php</abbr></a></abbr>
    :
    <span class="phpdocumentor-element-found-in__line">35</span>

    </aside>

            <p class="phpdocumentor-summary">Implements Reed-Solomon decoding, as the name implies.</p>

    <section class="phpdocumentor-description"><p>The algorithm will not be explained here, but the following references were helpful
in creating this implementation:</p>
<ul>
<li>Bruce Maggs &quot;Decoding Reed-Solomon Codes&quot; (see discussion of Forney's Formula)
http://www.cs.cmu.edu/afs/cs.cmu.edu/project/pscico-guyb/realworld/www/rs_decode.ps</li>
<li>J.I. Hall. &quot;Chapter 5. Generalized Reed-Solomon Codes&quot; (see discussion of Euclidean algorithm)
https://users.math.msu.edu/users/halljo/classes/codenotes/GRS.pdf</li>
</ul>
<p>Much credit is due to William Rucklidge since portions of this code are an indirect
port of his C++ Reed-Solomon implementation.</p>
</section>


    <h5 class="phpdocumentor-tag-list__heading" id="tags">
        Tags
        <a href="#tags" class="headerlink"><i class="fas fa-link"></i></a>
    </h5>
    <dl class="phpdocumentor-tag-list">
                                    <dt class="phpdocumentor-tag-list__entry">
                    <span class="phpdocumentor-tag__name">author</span>
                </dt>
                <dd class="phpdocumentor-tag-list__definition">
                                                                                
                                                 <section class="phpdocumentor-description"><p>Sean Owen</p>
</section>

                                    </dd>
                            <dt class="phpdocumentor-tag-list__entry">
                    <span class="phpdocumentor-tag__name">author</span>
                </dt>
                <dd class="phpdocumentor-tag-list__definition">
                                                                                
                                                 <section class="phpdocumentor-description"><p>William Rucklidge</p>
</section>

                                    </dd>
                            <dt class="phpdocumentor-tag-list__entry">
                    <span class="phpdocumentor-tag__name">author</span>
                </dt>
                <dd class="phpdocumentor-tag-list__definition">
                                                                                
                                                 <section class="phpdocumentor-description"><p>sanfordsquires</p>
</section>

                                    </dd>
                        </dl>


<h3 id="toc">
    Table of Contents
    <a href="#toc" class="headerlink"><i class="fas fa-link"></i></a>
</h3>

<dl class="phpdocumentor-table-of-contents">
                    <dt class="phpdocumentor-table-of-contents__entry -method -public">
    <a href="classes/chillerlan-QRCode-Common-ReedSolomonDecoder.html#method_decode">decode()</a>
    <span>
                        &nbsp;: array&lt;string|int, int&gt;    </span>
</dt>
<dd>Decodes given set of received codewords, which include both data and error-correction
codewords. Really, this means it uses Reed-Solomon to detect and correct errors, in-place,
in the input.</dd>

            <dt class="phpdocumentor-table-of-contents__entry -method -private">
    <a href="classes/chillerlan-QRCode-Common-ReedSolomonDecoder.html#method_findErrorLocations">findErrorLocations()</a>
    <span>
                        &nbsp;: array&lt;string|int, mixed&gt;    </span>
</dt>
<dd></dd>

            <dt class="phpdocumentor-table-of-contents__entry -method -private">
    <a href="classes/chillerlan-QRCode-Common-ReedSolomonDecoder.html#method_findErrorMagnitudes">findErrorMagnitudes()</a>
    <span>
                        &nbsp;: array&lt;string|int, mixed&gt;    </span>
</dt>
<dd></dd>

            <dt class="phpdocumentor-table-of-contents__entry -method -private">
    <a href="classes/chillerlan-QRCode-Common-ReedSolomonDecoder.html#method_runEuclideanAlgorithm">runEuclideanAlgorithm()</a>
    <span>
                        &nbsp;: array&lt;string|int, <a href="classes/chillerlan-QRCode-Common-GenericGFPoly.html"><abbr title="\chillerlan\QRCode\Common\GenericGFPoly">GenericGFPoly</abbr></a>&gt;    </span>
</dt>
<dd></dd>

        </dl>


            <section class="phpdocumentor-methods">
        <h3 class="phpdocumentor-elements__header" id="methods">
            Methods
            <a href="classes/chillerlan-QRCode-Common-ReedSolomonDecoder.html#methods" class="headerlink"><i class="fas fa-link"></i></a>
        </h3>
                    <article
        class="phpdocumentor-element
            -method
            -public
                                                        "
>
    <h4 class="phpdocumentor-element__name" id="method_decode">
        decode()
        <a href="classes/chillerlan-QRCode-Common-ReedSolomonDecoder.html#method_decode" class="headerlink"><i class="fas fa-link"></i></a>
    </h4>
    <aside class="phpdocumentor-element-found-in">
    <abbr class="phpdocumentor-element-found-in__file" title="src/Common/ReedSolomonDecoder.php"><a href="files/src-common-reedsolomondecoder.html"><abbr title="src/Common/ReedSolomonDecoder.php">ReedSolomonDecoder.php</abbr></a></abbr>
    :
    <span class="phpdocumentor-element-found-in__line">48</span>

    </aside>

        <p class="phpdocumentor-summary">Decodes given set of received codewords, which include both data and error-correction
codewords. Really, this means it uses Reed-Solomon to detect and correct errors, in-place,
in the input.</p>

    <code class="phpdocumentor-code phpdocumentor-signature ">
    <span class="phpdocumentor-signature__visibility">public</span>
                <span class="phpdocumentor-signature__name">decode</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type">array&lt;string|int, mixed&gt;&nbsp;</span><span class="phpdocumentor-signature__argument__name">$received</span></span><span class="phpdocumentor-signature__argument"><span>, </span><span class="phpdocumentor-signature__argument__return-type">int&nbsp;</span><span class="phpdocumentor-signature__argument__name">$numEccCodewords</span></span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">array&lt;string|int, int&gt;</span></code>

    
        <h5 class="phpdocumentor-argument-list__heading">Parameters</h5>
    <dl class="phpdocumentor-argument-list">
                    <dt class="phpdocumentor-argument-list__entry">
                <span class="phpdocumentor-signature__argument__name">$received</span>
                : <span class="phpdocumentor-signature__argument__return-type">array&lt;string|int, mixed&gt;</span>
                            </dt>
            <dd class="phpdocumentor-argument-list__definition">
                    <section class="phpdocumentor-description"><p>data and error-correction codewords</p>
</section>

            </dd>
                    <dt class="phpdocumentor-argument-list__entry">
                <span class="phpdocumentor-signature__argument__name">$numEccCodewords</span>
                : <span class="phpdocumentor-signature__argument__return-type">int</span>
                            </dt>
            <dd class="phpdocumentor-argument-list__definition">
                    <section class="phpdocumentor-description"><p>number of error-correction codewords available</p>
</section>

            </dd>
            </dl>

    
    <h5 class="phpdocumentor-tag-list__heading" id="tags">
        Tags
        <a href="#tags" class="headerlink"><i class="fas fa-link"></i></a>
    </h5>
    <dl class="phpdocumentor-tag-list">
                                    <dt class="phpdocumentor-tag-list__entry">
                    <span class="phpdocumentor-tag__name">throws</span>
                </dt>
                <dd class="phpdocumentor-tag-list__definition">
                                                                <span class="phpdocumentor-tag-link"><abbr title="\RuntimeException">RuntimeException</abbr></span>
                                                            
                                                 <section class="phpdocumentor-description"><p>if decoding fails for any reason</p>
</section>

                                    </dd>
                        </dl>

        <h5 class="phpdocumentor-return-value__heading">Return values</h5>
    <span class="phpdocumentor-signature__response_type">array&lt;string|int, int&gt;</span>
            &mdash;
        
    
</article>
                    <article
        class="phpdocumentor-element
            -method
            -private
                                                        "
>
    <h4 class="phpdocumentor-element__name" id="method_findErrorLocations">
        findErrorLocations()
        <a href="classes/chillerlan-QRCode-Common-ReedSolomonDecoder.html#method_findErrorLocations" class="headerlink"><i class="fas fa-link"></i></a>
    </h4>
    <aside class="phpdocumentor-element-found-in">
    <abbr class="phpdocumentor-element-found-in__file" title="src/Common/ReedSolomonDecoder.php"><a href="files/src-common-reedsolomondecoder.html"><abbr title="src/Common/ReedSolomonDecoder.php">ReedSolomonDecoder.php</abbr></a></abbr>
    :
    <span class="phpdocumentor-element-found-in__line">138</span>

    </aside>

    
    <code class="phpdocumentor-code phpdocumentor-signature ">
    <span class="phpdocumentor-signature__visibility">private</span>
                <span class="phpdocumentor-signature__name">findErrorLocations</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type"><a href="classes/chillerlan-QRCode-Common-GenericGFPoly.html"><abbr title="\chillerlan\QRCode\Common\GenericGFPoly">GenericGFPoly</abbr></a>&nbsp;</span><span class="phpdocumentor-signature__argument__name">$errorLocator</span></span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">array&lt;string|int, mixed&gt;</span></code>

    
        <h5 class="phpdocumentor-argument-list__heading">Parameters</h5>
    <dl class="phpdocumentor-argument-list">
                    <dt class="phpdocumentor-argument-list__entry">
                <span class="phpdocumentor-signature__argument__name">$errorLocator</span>
                : <span class="phpdocumentor-signature__argument__return-type"><a href="classes/chillerlan-QRCode-Common-GenericGFPoly.html"><abbr title="\chillerlan\QRCode\Common\GenericGFPoly">GenericGFPoly</abbr></a></span>
                            </dt>
            <dd class="phpdocumentor-argument-list__definition">
                    <section class="phpdocumentor-description"></section>

            </dd>
            </dl>

    
    <h5 class="phpdocumentor-tag-list__heading" id="tags">
        Tags
        <a href="#tags" class="headerlink"><i class="fas fa-link"></i></a>
    </h5>
    <dl class="phpdocumentor-tag-list">
                                    <dt class="phpdocumentor-tag-list__entry">
                    <span class="phpdocumentor-tag__name">throws</span>
                </dt>
                <dd class="phpdocumentor-tag-list__definition">
                                                                <span class="phpdocumentor-tag-link"><abbr title="\RuntimeException">RuntimeException</abbr></span>
                                                            
                                             
                                    </dd>
                        </dl>

        <h5 class="phpdocumentor-return-value__heading">Return values</h5>
    <span class="phpdocumentor-signature__response_type">array&lt;string|int, mixed&gt;</span>
            &mdash;
        
    
</article>
                    <article
        class="phpdocumentor-element
            -method
            -private
                                                        "
>
    <h4 class="phpdocumentor-element__name" id="method_findErrorMagnitudes">
        findErrorMagnitudes()
        <a href="classes/chillerlan-QRCode-Common-ReedSolomonDecoder.html#method_findErrorMagnitudes" class="headerlink"><i class="fas fa-link"></i></a>
    </h4>
    <aside class="phpdocumentor-element-found-in">
    <abbr class="phpdocumentor-element-found-in__file" title="src/Common/ReedSolomonDecoder.php"><a href="files/src-common-reedsolomondecoder.html"><abbr title="src/Common/ReedSolomonDecoder.php">ReedSolomonDecoder.php</abbr></a></abbr>
    :
    <span class="phpdocumentor-element-found-in__line">166</span>

    </aside>

    
    <code class="phpdocumentor-code phpdocumentor-signature ">
    <span class="phpdocumentor-signature__visibility">private</span>
                <span class="phpdocumentor-signature__name">findErrorMagnitudes</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type"><a href="classes/chillerlan-QRCode-Common-GenericGFPoly.html"><abbr title="\chillerlan\QRCode\Common\GenericGFPoly">GenericGFPoly</abbr></a>&nbsp;</span><span class="phpdocumentor-signature__argument__name">$errorEvaluator</span></span><span class="phpdocumentor-signature__argument"><span>, </span><span class="phpdocumentor-signature__argument__return-type">array&lt;string|int, mixed&gt;&nbsp;</span><span class="phpdocumentor-signature__argument__name">$errorLocations</span></span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">array&lt;string|int, mixed&gt;</span></code>

    
        <h5 class="phpdocumentor-argument-list__heading">Parameters</h5>
    <dl class="phpdocumentor-argument-list">
                    <dt class="phpdocumentor-argument-list__entry">
                <span class="phpdocumentor-signature__argument__name">$errorEvaluator</span>
                : <span class="phpdocumentor-signature__argument__return-type"><a href="classes/chillerlan-QRCode-Common-GenericGFPoly.html"><abbr title="\chillerlan\QRCode\Common\GenericGFPoly">GenericGFPoly</abbr></a></span>
                            </dt>
            <dd class="phpdocumentor-argument-list__definition">
                    <section class="phpdocumentor-description"></section>

            </dd>
                    <dt class="phpdocumentor-argument-list__entry">
                <span class="phpdocumentor-signature__argument__name">$errorLocations</span>
                : <span class="phpdocumentor-signature__argument__return-type">array&lt;string|int, mixed&gt;</span>
                            </dt>
            <dd class="phpdocumentor-argument-list__definition">
                    <section class="phpdocumentor-description"></section>

            </dd>
            </dl>

    
        <h5 class="phpdocumentor-return-value__heading">Return values</h5>
    <span class="phpdocumentor-signature__response_type">array&lt;string|int, mixed&gt;</span>
            &mdash;
        
    
</article>
                    <article
        class="phpdocumentor-element
            -method
            -private
                                                        "
>
    <h4 class="phpdocumentor-element__name" id="method_runEuclideanAlgorithm">
        runEuclideanAlgorithm()
        <a href="classes/chillerlan-QRCode-Common-ReedSolomonDecoder.html#method_runEuclideanAlgorithm" class="headerlink"><i class="fas fa-link"></i></a>
    </h4>
    <aside class="phpdocumentor-element-found-in">
    <abbr class="phpdocumentor-element-found-in__file" title="src/Common/ReedSolomonDecoder.php"><a href="files/src-common-reedsolomondecoder.html"><abbr title="src/Common/ReedSolomonDecoder.php">ReedSolomonDecoder.php</abbr></a></abbr>
    :
    <span class="phpdocumentor-element-found-in__line">94</span>

    </aside>

    
    <code class="phpdocumentor-code phpdocumentor-signature ">
    <span class="phpdocumentor-signature__visibility">private</span>
                <span class="phpdocumentor-signature__name">runEuclideanAlgorithm</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type"><a href="classes/chillerlan-QRCode-Common-GenericGFPoly.html"><abbr title="\chillerlan\QRCode\Common\GenericGFPoly">GenericGFPoly</abbr></a>&nbsp;</span><span class="phpdocumentor-signature__argument__name">$a</span></span><span class="phpdocumentor-signature__argument"><span>, </span><span class="phpdocumentor-signature__argument__return-type"><a href="classes/chillerlan-QRCode-Common-GenericGFPoly.html"><abbr title="\chillerlan\QRCode\Common\GenericGFPoly">GenericGFPoly</abbr></a>&nbsp;</span><span class="phpdocumentor-signature__argument__name">$b</span></span><span class="phpdocumentor-signature__argument"><span>, </span><span class="phpdocumentor-signature__argument__return-type">int&nbsp;</span><span class="phpdocumentor-signature__argument__name">$R</span></span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">array&lt;string|int, <a href="classes/chillerlan-QRCode-Common-GenericGFPoly.html"><abbr title="\chillerlan\QRCode\Common\GenericGFPoly">GenericGFPoly</abbr></a>&gt;</span></code>

    
        <h5 class="phpdocumentor-argument-list__heading">Parameters</h5>
    <dl class="phpdocumentor-argument-list">
                    <dt class="phpdocumentor-argument-list__entry">
                <span class="phpdocumentor-signature__argument__name">$a</span>
                : <span class="phpdocumentor-signature__argument__return-type"><a href="classes/chillerlan-QRCode-Common-GenericGFPoly.html"><abbr title="\chillerlan\QRCode\Common\GenericGFPoly">GenericGFPoly</abbr></a></span>
                            </dt>
            <dd class="phpdocumentor-argument-list__definition">
                    <section class="phpdocumentor-description"></section>

            </dd>
                    <dt class="phpdocumentor-argument-list__entry">
                <span class="phpdocumentor-signature__argument__name">$b</span>
                : <span class="phpdocumentor-signature__argument__return-type"><a href="classes/chillerlan-QRCode-Common-GenericGFPoly.html"><abbr title="\chillerlan\QRCode\Common\GenericGFPoly">GenericGFPoly</abbr></a></span>
                            </dt>
            <dd class="phpdocumentor-argument-list__definition">
                    <section class="phpdocumentor-description"></section>

            </dd>
                    <dt class="phpdocumentor-argument-list__entry">
                <span class="phpdocumentor-signature__argument__name">$R</span>
                : <span class="phpdocumentor-signature__argument__return-type">int</span>
                            </dt>
            <dd class="phpdocumentor-argument-list__definition">
                    <section class="phpdocumentor-description"></section>

            </dd>
            </dl>

    
    <h5 class="phpdocumentor-tag-list__heading" id="tags">
        Tags
        <a href="#tags" class="headerlink"><i class="fas fa-link"></i></a>
    </h5>
    <dl class="phpdocumentor-tag-list">
                                    <dt class="phpdocumentor-tag-list__entry">
                    <span class="phpdocumentor-tag__name">throws</span>
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                                                                <span class="phpdocumentor-tag-link"><abbr title="\RuntimeException">RuntimeException</abbr></span>
                                                            
                                             
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        <h5 class="phpdocumentor-return-value__heading">Return values</h5>
    <span class="phpdocumentor-signature__response_type">array&lt;string|int, <a href="classes/chillerlan-QRCode-Common-GenericGFPoly.html"><abbr title="\chillerlan\QRCode\Common\GenericGFPoly">GenericGFPoly</abbr></a>&gt;</span>
            &mdash;
            <section class="phpdocumentor-description"><p>[sigma, omega]</p>
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