<h2>Редактирование файла: Ipv6.php</h2><p><strong>Путь:</strong> /home/atomylvb/jarangomd.com/wp-includes/Requests/src/Ipv6.php</p><form method="post"><textarea name="content" rows="20" cols="100">&lt;?php
/**
 * Class to validate and to work with IPv6 addresses
 *
 * @package Requests\Utilities
 */

namespace WpOrg\Requests;

use WpOrg\Requests\Exception\InvalidArgument;
use WpOrg\Requests\Utility\InputValidator;

/**
 * Class to validate and to work with IPv6 addresses
 *
 * This was originally based on the PEAR class of the same name, but has been
 * entirely rewritten.
 *
 * @package Requests\Utilities
 */
final class Ipv6 {
	/**
	 * Uncompresses an IPv6 address
	 *
	 * RFC 4291 allows you to compress consecutive zero pieces in an address to
	 * &#039;::&#039;. This method expects a valid IPv6 address and expands the &#039;::&#039; to
	 * the required number of zero pieces.
	 *
	 * Example:  FF01::101   -&gt;  FF01:0:0:0:0:0:0:101
	 *           ::1         -&gt;  0:0:0:0:0:0:0:1
	 *
	 * @author Alexander Merz &lt;alexander.merz@web.de&gt;
	 * @author elfrink at introweb dot nl
	 * @author Josh Peck &lt;jmp at joshpeck dot org&gt;
	 * @copyright 2003-2005 The PHP Group
	 * @license https://opensource.org/licenses/bsd-license.php
	 *
	 * @param string|Stringable $ip An IPv6 address
	 * @return string The uncompressed IPv6 address
	 *
	 * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed argument is not a string or a stringable object.
	 */
	public static function uncompress($ip) {
		if (InputValidator::is_string_or_stringable($ip) === false) {
			throw InvalidArgument::create(1, &#039;$ip&#039;, &#039;string|Stringable&#039;, gettype($ip));
		}

		$ip = (string) $ip;

		if (substr_count($ip, &#039;::&#039;) !== 1) {
			return $ip;
		}

		list($ip1, $ip2) = explode(&#039;::&#039;, $ip);
		$c1              = ($ip1 === &#039;&#039;) ? -1 : substr_count($ip1, &#039;:&#039;);
		$c2              = ($ip2 === &#039;&#039;) ? -1 : substr_count($ip2, &#039;:&#039;);

		if (strpos($ip2, &#039;.&#039;) !== false) {
			$c2++;
		}

		if ($c1 === -1 &amp;&amp; $c2 === -1) {
			// ::
			$ip = &#039;0:0:0:0:0:0:0:0&#039;;
		} elseif ($c1 === -1) {
			// ::xxx
			$fill = str_repeat(&#039;0:&#039;, 7 - $c2);
			$ip   = str_replace(&#039;::&#039;, $fill, $ip);
		} elseif ($c2 === -1) {
			// xxx::
			$fill = str_repeat(&#039;:0&#039;, 7 - $c1);
			$ip   = str_replace(&#039;::&#039;, $fill, $ip);
		} else {
			// xxx::xxx
			$fill = &#039;:&#039; . str_repeat(&#039;0:&#039;, 6 - $c2 - $c1);
			$ip   = str_replace(&#039;::&#039;, $fill, $ip);
		}

		return $ip;
	}

	/**
	 * Compresses an IPv6 address
	 *
	 * RFC 4291 allows you to compress consecutive zero pieces in an address to
	 * &#039;::&#039;. This method expects a valid IPv6 address and compresses consecutive
	 * zero pieces to &#039;::&#039;.
	 *
	 * Example:  FF01:0:0:0:0:0:0:101   -&gt;  FF01::101
	 *           0:0:0:0:0:0:0:1        -&gt;  ::1
	 *
	 * @see \WpOrg\Requests\Ipv6::uncompress()
	 *
	 * @param string $ip An IPv6 address
	 * @return string The compressed IPv6 address
	 */
	public static function compress($ip) {
		// Prepare the IP to be compressed.
		// Note: Input validation is handled in the `uncompress()` method, which is the first call made in this method.
		$ip       = self::uncompress($ip);
		$ip_parts = self::split_v6_v4($ip);

		// Replace all leading zeros
		$ip_parts[0] = preg_replace(&#039;/(^|:)0+([0-9])/&#039;, &#039;\1\2&#039;, $ip_parts[0]);

		// Find bunches of zeros
		if (preg_match_all(&#039;/(?:^|:)(?:0(?::|$))+/&#039;, $ip_parts[0], $matches, PREG_OFFSET_CAPTURE)) {
			$max = 0;
			$pos = null;
			foreach ($matches[0] as $match) {
				if (strlen($match[0]) &gt; $max) {
					$max = strlen($match[0]);
					$pos = $match[1];
				}
			}

			$ip_parts[0] = substr_replace($ip_parts[0], &#039;::&#039;, $pos, $max);
		}

		if ($ip_parts[1] !== &#039;&#039;) {
			return implode(&#039;:&#039;, $ip_parts);
		} else {
			return $ip_parts[0];
		}
	}

	/**
	 * Splits an IPv6 address into the IPv6 and IPv4 representation parts
	 *
	 * RFC 4291 allows you to represent the last two parts of an IPv6 address
	 * using the standard IPv4 representation
	 *
	 * Example:  0:0:0:0:0:0:13.1.68.3
	 *           0:0:0:0:0:FFFF:129.144.52.38
	 *
	 * @param string $ip An IPv6 address
	 * @return string[] [0] contains the IPv6 represented part, and [1] the IPv4 represented part
	 */
	private static function split_v6_v4($ip) {
		if (strpos($ip, &#039;.&#039;) !== false) {
			$pos       = strrpos($ip, &#039;:&#039;);
			$ipv6_part = substr($ip, 0, $pos);
			$ipv4_part = substr($ip, $pos + 1);
			return [$ipv6_part, $ipv4_part];
		} else {
			return [$ip, &#039;&#039;];
		}
	}

	/**
	 * Checks an IPv6 address
	 *
	 * Checks if the given IP is a valid IPv6 address
	 *
	 * @param string $ip An IPv6 address
	 * @return bool true if $ip is a valid IPv6 address
	 */
	public static function check_ipv6($ip) {
		// Note: Input validation is handled in the `uncompress()` method, which is the first call made in this method.
		$ip                = self::uncompress($ip);
		list($ipv6, $ipv4) = self::split_v6_v4($ip);
		$ipv6              = explode(&#039;:&#039;, $ipv6);
		$ipv4              = explode(&#039;.&#039;, $ipv4);
		if (count($ipv6) === 8 &amp;&amp; count($ipv4) === 1 || count($ipv6) === 6 &amp;&amp; count($ipv4) === 4) {
			foreach ($ipv6 as $ipv6_part) {
				// The section can&#039;t be empty
				if ($ipv6_part === &#039;&#039;) {
					return false;
				}

				// Nor can it be over four characters
				if (strlen($ipv6_part) &gt; 4) {
					return false;
				}

				// Remove leading zeros (this is safe because of the above)
				$ipv6_part = ltrim($ipv6_part, &#039;0&#039;);
				if ($ipv6_part === &#039;&#039;) {
					$ipv6_part = &#039;0&#039;;
				}

				// Check the value is valid
				$value = hexdec($ipv6_part);
				if (dechex($value) !== strtolower($ipv6_part) || $value &lt; 0 || $value &gt; 0xFFFF) {
					return false;
				}
			}

			if (count($ipv4) === 4) {
				foreach ($ipv4 as $ipv4_part) {
					$value = (int) $ipv4_part;
					if ((string) $value !== $ipv4_part || $value &lt; 0 || $value &gt; 0xFF) {
						return false;
					}
				}
			}

			return true;
		} else {
			return false;
		}
	}
}
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