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File Name : Ipv6.php

<?php

/**
 * Class to validate and to work with IPv6 addresses
 *
 * @package Requests\Utilities
 */
namespace VendorDuplicator\WpOrg\Requests;

use VendorDuplicator\WpOrg\Requests\Exception\InvalidArgument;
use VendorDuplicator\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
     * '::'. This method expects a valid IPv6 address and expands the '::' to
     * the required number of zero pieces.
     *
     * Example:  FF01::101   ->  FF01:0:0:0:0:0:0:101
     *           ::1         ->  0:0:0:0:0:0:0:1
     *
     * @author Alexander Merz <alexander.merz@web.de>
     * @author elfrink at introweb dot nl
     * @author Josh Peck <jmp at joshpeck dot org>
     * @copyright 2003-2005 The PHP Group
     * @license https://opensource.org/licenses/bsd-license.php
     *
     * @param string|Stringable $ip An IPv6 address
     * @return string The uncompressed IPv6 address
     *
     * @throws \VendorDuplicator\WpOrg\Requests\Exception\InvalidArgument When the passed argument is not a string or a stringable object.
     */
    public static function uncompress($ip)
    {
        if (InputValidator::is_string_or_stringable($ip) === \false) {
            throw InvalidArgument::create(1, '$ip', 'string|Stringable', gettype($ip));
        }
        $ip = (string) $ip;
        if (substr_count($ip, '::') !== 1) {
            return $ip;
        }
        list($ip1, $ip2) = explode('::', $ip);
        $c1 = $ip1 === '' ? -1 : substr_count($ip1, ':');
        $c2 = $ip2 === '' ? -1 : substr_count($ip2, ':');
        if (strpos($ip2, '.') !== \false) {
            $c2++;
        }
        if ($c1 === -1 && $c2 === -1) {
            // ::
            $ip = '0:0:0:0:0:0:0:0';
        } elseif ($c1 === -1) {
            // ::xxx
            $fill = str_repeat('0:', 7 - $c2);
            $ip = str_replace('::', $fill, $ip);
        } elseif ($c2 === -1) {
            // xxx::
            $fill = str_repeat(':0', 7 - $c1);
            $ip = str_replace('::', $fill, $ip);
        } else {
            // xxx::xxx
            $fill = ':' . str_repeat('0:', 6 - $c2 - $c1);
            $ip = str_replace('::', $fill, $ip);
        }
        return $ip;
    }
    /**
     * Compresses an IPv6 address
     *
     * RFC 4291 allows you to compress consecutive zero pieces in an address to
     * '::'. This method expects a valid IPv6 address and compresses consecutive
     * zero pieces to '::'.
     *
     * Example:  FF01:0:0:0:0:0:0:101   ->  FF01::101
     *           0:0:0:0:0:0:0:1        ->  ::1
     *
     * @see \VendorDuplicator\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('/(^|:)0+([0-9])/', '\1\2', $ip_parts[0]);
        // Find bunches of zeros
        if (preg_match_all('/(?:^|:)(?:0(?::|$))+/', $ip_parts[0], $matches, \PREG_OFFSET_CAPTURE)) {
            $max = 0;
            $pos = null;
            foreach ($matches[0] as $match) {
                if (strlen($match[0]) > $max) {
                    $max = strlen($match[0]);
                    $pos = $match[1];
                }
            }
            $ip_parts[0] = substr_replace($ip_parts[0], '::', $pos, $max);
        }
        if ($ip_parts[1] !== '') {
            return implode(':', $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, '.') !== \false) {
            $pos = strrpos($ip, ':');
            $ipv6_part = substr($ip, 0, $pos);
            $ipv4_part = substr($ip, $pos + 1);
            return [$ipv6_part, $ipv4_part];
        } else {
            return [$ip, ''];
        }
    }
    /**
     * 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(':', $ipv6);
        $ipv4 = explode('.', $ipv4);
        if (count($ipv6) === 8 && count($ipv4) === 1 || count($ipv6) === 6 && count($ipv4) === 4) {
            foreach ($ipv6 as $ipv6_part) {
                // The section can't be empty
                if ($ipv6_part === '') {
                    return \false;
                }
                // Nor can it be over four characters
                if (strlen($ipv6_part) > 4) {
                    return \false;
                }
                // Remove leading zeros (this is safe because of the above)
                $ipv6_part = ltrim($ipv6_part, '0');
                if ($ipv6_part === '') {
                    $ipv6_part = '0';
                }
                // Check the value is valid
                $value = hexdec($ipv6_part);
                if (dechex($value) !== strtolower($ipv6_part) || $value < 0 || $value > 0xffff) {
                    return \false;
                }
            }
            if (count($ipv4) === 4) {
                foreach ($ipv4 as $ipv4_part) {
                    $value = (int) $ipv4_part;
                    if ((string) $value !== $ipv4_part || $value < 0 || $value > 0xff) {
                        return \false;
                    }
                }
            }
            return \true;
        } else {
            return \false;
        }
    }
}

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