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phpMyAdmin/vendor/bacon/bacon-qr-code/src/BaconQrCode/Common/BitUtils.php

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+<?php
+/**
+ * BaconQrCode
+ *
+ * @link      http://github.com/Bacon/BaconQrCode For the canonical source repository
+ * @copyright 2013 Ben 'DASPRiD' Scholzen
+ * @license   http://opensource.org/licenses/BSD-2-Clause Simplified BSD License
+ */
+
+namespace BaconQrCode\Common;
+
+/**
+ * General bit utilities.
+ *
+ * All utility methods are based on 32-bit integers and also work on 64-bit
+ * systems.
+ */
+class BitUtils
+{
+    /**
+     * Performs an unsigned right shift.
+     *
+     * This is the same as the unsigned right shift operator ">>>" in other
+     * languages.
+     *
+     * @param  integer $a
+     * @param  integer $b
+     * @return integer
+     */
+    public static function unsignedRightShift($a, $b)
+    {
+        return (
+            $a >= 0
+            ? $a >> $b
+            : (($a & 0x7fffffff) >> $b) | (0x40000000 >> ($b - 1))
+        );
+    }
+
+    /**
+     * Gets the number of trailing zeros.
+     *
+     * @param  integer $i
+     * @return integer
+     */
+    public static function numberOfTrailingZeros($i)
+    {
+        $lastPos = strrpos(str_pad(decbin($i), 32, '0', STR_PAD_LEFT), '1');
+
+        return $lastPos === false ? 32 : 31 - $lastPos;
+    }
+}