IPv6.php
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IPv6.php
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	<?php

	namespace Keruald\OmniTools\Network;

	use InvalidArgumentException;

	class IPv6 extends IP {

	///
	/// Constants
	///

	const DOMAIN = 10; // AF_INET6

	///
	/// Properties
	///

	/**
	* @var string
	*/
	private $ip;

	///
	/// Constructors
	///

	public function __construct (string $ip) {
	$this->ip = $ip;
	}

	public static function from (string $ip) : self {
	$ipv6 = new self($ip);

	if (!$ipv6->isValid()) {
	throw new InvalidArgumentException;
	}

	$ipv6->normalize();

	return $ipv6;
	}

	public static function fromBinaryBits (array $bits) : self {
	$fullBits = $bits + array_fill(0, 128, 0);
	$hextets = [];

	for ($i = 0 ; $i < 8 ; $i++) {
	// Read 16 bits
	$slice = implode("", array_slice($fullBits, $i * 16, 16));
	$hextets[] = base_convert($slice, 2, 16);
	}

	return self::from(implode(":", $hextets));
	}

	///
	/// Helper methods
	///

	public function isValid () : bool {
	return IP::isIPv6($this->ip);
	}

	public function getDomain () : int {
	return self::DOMAIN; // AF_INET6
	}

	public function increment (int $increment = 1) : self {
	if ($increment === 0) {
	return $this;
	}

	if ($increment < 0) {
	throw new InvalidArgumentException("This method doesn't support decrementation.");
	}

	$ipAsNumericBinary = inet_pton($this->ip);

	// See https://gist.github.com/little-apps/88bbd23576008a84e0b6
	$i = strlen($ipAsNumericBinary) - 1;
	$remainder = $increment;

	while ($remainder > 0 && $i >= 0) {
	$sum = ord($ipAsNumericBinary[$i]) + $remainder;
	$remainder = $sum / 256;
	$ipAsNumericBinary[$i] = chr($sum % 256);

	--$i;
	}

	$this->ip = inet_ntop($ipAsNumericBinary);
	return $this;
	}

	public function normalize () : self {
	$this->ip = inet_ntop(inet_pton($this->ip));
	return $this;
	}

	public function isNormalized() : bool {
	return $this->ip === inet_ntop(inet_pton($this->ip));
	}

	///
	/// Magic methods
	///

	public function __toString () : string {
	return $this->ip;
	}
	}

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