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    <p>JavaScript implementation:</p> <pre><code>function encodeWebSocket(bytesRaw){ var bytesFormatted = new Array(); bytesFormatted[0] = 129; if (bytesRaw.length &lt;= 125) { bytesFormatted[1] = bytesRaw.length; } else if (bytesRaw.length &gt;= 126 &amp;&amp; bytesRaw.length &lt;= 65535) { bytesFormatted[1] = 126; bytesFormatted[2] = ( bytesRaw.length &gt;&gt; 8 ) &amp; 255; bytesFormatted[3] = ( bytesRaw.length ) &amp; 255; } else { bytesFormatted[1] = 127; bytesFormatted[2] = ( bytesRaw.length &gt;&gt; 56 ) &amp; 255; bytesFormatted[3] = ( bytesRaw.length &gt;&gt; 48 ) &amp; 255; bytesFormatted[4] = ( bytesRaw.length &gt;&gt; 40 ) &amp; 255; bytesFormatted[5] = ( bytesRaw.length &gt;&gt; 32 ) &amp; 255; bytesFormatted[6] = ( bytesRaw.length &gt;&gt; 24 ) &amp; 255; bytesFormatted[7] = ( bytesRaw.length &gt;&gt; 16 ) &amp; 255; bytesFormatted[8] = ( bytesRaw.length &gt;&gt; 8 ) &amp; 255; bytesFormatted[9] = ( bytesRaw.length ) &amp; 255; } for (var i = 0; i &lt; bytesRaw.length; i++){ bytesFormatted.push(bytesRaw.charCodeAt(i)); } return bytesFormatted; } function decodeWebSocket (data){ var datalength = data[1] &amp; 127; var indexFirstMask = 2; if (datalength == 126) { indexFirstMask = 4; } else if (datalength == 127) { indexFirstMask = 10; } var masks = data.slice(indexFirstMask,indexFirstMask + 4); var i = indexFirstMask + 4; var index = 0; var output = ""; while (i &lt; data.length) { output += String.fromCharCode(data[i++] ^ masks[index++ % 4]); } return output; } </code></pre>
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