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Name	Size	Permission	Date	Action
UUID4.php	1.72 KB	-rwxr-xr-x	2020-12-16 15:43

Rename

<?php
/*
 * @package   akeebabackup
 * @copyright Copyright (c)2006-2020 Nicholas K. Dionysopoulos / Akeeba Ltd
 * @license   GNU General Public License version 3, or later
 */

namespace Joomla\Plugin\Console\AkeebaBackup\Helper;

defined('_JEXEC') || die;

class UUID4
{
	protected $isUpperCase;

public function __construct($isUpperCase = false)
	{
		$this->isUpperCase = !!$isUpperCase;
	}

public function get($sep = '-')
	{
		$result = '';
		// time_low                     unsigned 32 bit integer
		$result .= $this->random(32);
		// "-"
		$result .= $sep;
		// time_mid                     unsigned 16 bit integer
		$result .= $this->random(16);
		// "-"
		$result .= $sep;
		// time_hi_and_version          unsigned 16 bit integer
		// version (0100)
		$result .= $this->hexString(1 << 2, 4);
		// time-hi
		$result .= $this->random(12);
		// "-"
		$result .= $sep;
		// clock_seq_hi_and_reserved    unsigned 8  bit integer
		// 10xxxxxx (x is random)
		$result .= $this->hexString(1 << 7 | random_int(0, 2 ** 6 - 1), 8);
		// clock_seq_low                unsigned 8  bit integer
		$result .= $this->random(8);
		// "-"
		$result .= $sep;
		// node                         unsigned 48 bit integer
		$result .= $this->random(48);

return $result;
	}

protected function random($bitNum)
	{
		$result = '';
		$bits   = 16;
		$sum    = 0;
		while ($bitNum != $sum && $bits > 0)
		{
			$bits   = (($bitNum - $sum) > 16) ? 16 : $bitNum - $sum;
			$sum    += $bits;
			$val    = random_int(0, 2 ** $bits - 1);
			$result = $this->hexString($val, $bits) . $result;
		}

return $result;
	}

protected function hexString($val, $bits)
	{
		$digits = (int) ($bits / 4 + 0.9);

return sprintf('%0' . $digits . ($this->isUpperCase ? 'X' : 'x'), $val);
	}
}