<?php

namespace Badcow\DNS\Edns\Option;

/**
 * @see https://www.rfc-editor.org/rfc/rfc7828.html#section-3.1
 */
class TCP_KEEPALIVE implements OptionInterface
{
    use OptionTrait;

    public const NAME = 'TCP_KEEPALIVE';
    public const CODE = 11;

    /** @var int|null */
    protected $timeout;

    public function getTimeout(): ?int
    {
        return $this->timeout;
    }

    public function setTimeout(?int $timeout): void
    {
        $this->timeout = $timeout;
    }

    public function toWire(): string
    {
        if (null === $this->timeout) {
            return '';
        }

        return pack('n', $this->timeout);
    }

    public function fromWire(string $optionValue, int &$offset = 0, ?int $optionLength = null): void
    {
        $optionLength = $optionLength ?? strlen($optionValue);
        if (0 !== $optionLength and 2 !== $optionLength) {
            throw new DecodeException(self::NAME, $optionValue);
        }
        if (2 === $optionLength) {
            $integers = unpack('ntimeout', $optionValue, $offset);
            if (false === $integers) {
                throw new DecodeException(self::NAME, $optionValue);
            }
            $offset += 2;
            $this->timeout = $integers['timeout'];
        }
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MjY5MzA5NjMzOTMxMDE1OCAxNjUxMTQ0NzkwNDM1MDk3IDcwOTcxODMyNzIxMzYwODg=