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files >> //home/techyfnq/www/wp-content/plugins/site-reviews/vendors/vectorface/whip/IpRange/Ipv6Range.php

 <?php

namespace GeminiLabs\Vectorface\Whip\IpRange;

/**
 * A class representing an IPv6 address range.
 * @copyright Vectorface, Inc 2015
 * @author Daniel Bruce <dbruce1126@gmail.com>
 */
class Ipv6Range implements IpRange
{

    /** The size of the IPv6 range mask. */
    private $mask;

    /** The binary substring of the range minus the mask. */
    private $rangeSubstring;

    /**
     * Constructor for the class.
     * @param string $range The IPv6 range as a string. Supported range styles:
     *        - CIDR notation (2400:cb00::/32)
     *        - a specific IP address (::1)
     */
    public function __construct($range)
    {
        $this->extractNetworkAndMaskFromRange($range);
    }

    /**
     * Returns whether or not a given IP address falls within this range.
     * @param string $ipAddress The given IP address.
     * @return boolean Returns true if the IP address falls within the range
     *         and false otherwise.
     */
    public function containsIp($ipAddress)
    {
        // if the mask is false this means we have a full IP address as a
        // range so compare against the whole string
        if (false === $this->mask) {
            return ($this->rangeSubstring === $this->convertToBinaryString($ipAddress));
        }

        // remove the masked part of the address
        $ipAddressSubstring = substr(
            $this->convertToBinaryString($ipAddress),
            0,
            $this->mask
        );
        return ($this->rangeSubstring === $ipAddressSubstring);
    }

    /**
     * Extracts the mask and binary string substring of the range to compare
     * against incoming IP addresses.
     * @param string $range The IPv6 range as a string.
     */
    private function extractNetworkAndMaskFromRange($range)
    {
        if (false !== strpos($range, '/')) {
            // handle the CIDR notation
            list($network, $this->mask) = explode('/', $range);
            // store a substring of the binary representation of the range
            // minus the masked part
            $this->rangeSubstring = substr(
                $this->convertToBinaryString($network),
                0,
                $this->mask
            );
        } else {
            // handle a single IP address
            $this->rangeSubstring = $this->convertToBinaryString($range);
            $this->mask = false;
        }
    }

    /**
     * Converts an IPv6 address to a binary string.
     * @param string $address The IPv6 address in standard notation.
     * @return string Returns the address as a string of bits.
     */
    private function convertToBinaryString($address)
    {
        return implode('', array_map(
            array(__CLASS__, 'hexToBinary'),
            str_split(bin2hex(inet_pton($address)))
        ));
    }
    /**
     * Converts a hexadecimal character to a 4-digit binary string.
     * @param string $hex The hexadecimal character.
     * @return string Returns a 4-digit binary string.
     */
    private static function hexToBinary($hex)
    {
        return str_pad(base_convert($hex, 16, 2), 4, '0', STR_PAD_LEFT);
    }
}

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