<h2>Редактирование файла: IPv6.php</h2><p><strong>Путь:</strong> /home/atomylvb/jarangomd.com/wp-includes/SimplePie/src/Net/IPv6.php</p><form method="post"><textarea name="content" rows="20" cols="100">&lt;?php

// SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue
// SPDX-License-Identifier: BSD-3-Clause

declare(strict_types=1);

namespace SimplePie\Net;

/**
 * Class to validate and to work with IPv6 addresses.
 *
 * @copyright 2003-2005 The PHP Group
 * @license http://www.opensource.org/licenses/bsd-license.php
 * @link http://pear.php.net/package/Net_IPv6
 * @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;
 * @author Sam Sneddon &lt;geoffers@gmail.com&gt;
 */
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 http://www.opensource.org/licenses/bsd-license.php
     * @param string $ip An IPv6 address
     * @return string The uncompressed IPv6 address
     */
    public static function uncompress(string $ip)
    {
        $c1 = -1;
        $c2 = -1;
        if (substr_count($ip, &#039;::&#039;) === 1) {
            [$ip1, $ip2] = explode(&#039;::&#039;, $ip);
            if ($ip1 === &#039;&#039;) {
                $c1 = -1;
            } else {
                $c1 = substr_count($ip1, &#039;:&#039;);
            }
            if ($ip2 === &#039;&#039;) {
                $c2 = -1;
            } else {
                $c2 = substr_count($ip2, &#039;:&#039;);
            }
            if (strpos($ip2, &#039;.&#039;) !== false) {
                $c2++;
            }
            // ::
            if ($c1 === -1 &amp;&amp; $c2 === -1) {
                $ip = &#039;0:0:0:0:0:0:0:0&#039;;
            }
            // ::xxx
            elseif ($c1 === -1) {
                $fill = str_repeat(&#039;0:&#039;, 7 - $c2);
                $ip = str_replace(&#039;::&#039;, $fill, $ip);
            }
            // xxx::
            elseif ($c2 === -1) {
                $fill = str_repeat(&#039;:0&#039;, 7 - $c1);
                $ip = str_replace(&#039;::&#039;, $fill, $ip);
            }
            // xxx::xxx
            else {
                $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 uncompress()
     * @param string $ip An IPv6 address
     * @return string The compressed IPv6 address
     */
    public static function compress(string $ip)
    {
        // Prepare the IP to be compressed
        $ip = self::uncompress($ip);
        $ip_parts = self::split_v6_v4($ip);

        // Replace all leading zeros
        $ip_parts[0] = (string) 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];
                }
            }

            assert($pos !== null, &#039;For PHPStan: Since the regex matched, there is at least one match. And because the pattern is non-empty, the loop will always end with $pos ≥ 1.&#039;);
            $ip_parts[0] = substr_replace($ip_parts[0], &#039;::&#039;, $pos, $max);
        }

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

        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 array{string, string} [0] contains the IPv6 represented part, and [1] the IPv4 represented part
     */
    private static function split_v6_v4(string $ip): array
    {
        if (strpos($ip, &#039;.&#039;) !== false) {
            $pos = strrpos($ip, &#039;:&#039;);
            assert($pos !== false, &#039;For PHPStan: IPv6 address must contain colon, since split_v6_v4 is only ever called after uncompress.&#039;);
            $ipv6_part = substr($ip, 0, $pos);
            $ipv4_part = substr($ip, $pos + 1);
            return [$ipv6_part, $ipv4_part];
        }

        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(string $ip)
    {
        $ip = self::uncompress($ip);
        [$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 ($value &lt; 0 || $value &gt; 0xFFFF) {
                    return false;
                }
                assert(is_int($value), &#039;For PHPStan: $value is only float when $ipv6_part &gt; PHP_INT_MAX&#039;);
                if (dechex($value) !== strtolower($ipv6_part)) {
                    return false;
                }
            }
            if (count($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;
        }

        return false;
    }

    /**
     * Checks if the given IP is a valid IPv6 address
     *
     * @codeCoverageIgnore
     * @deprecated Use {@see IPv6::check_ipv6()} instead
     * @see check_ipv6
     * @param string $ip An IPv6 address
     * @return bool true if $ip is a valid IPv6 address
     */
    public static function checkIPv6(string $ip)
    {
        return self::check_ipv6($ip);
    }
}

class_alias(&#039;SimplePie\Net\IPv6&#039;, &#039;SimplePie_Net_IPv6&#039;);
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