<?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:----MTgxNTYxODY3MTMyMDkwMiA2MjM0NjY1Mzg3NjgyNjA1IDUzODM1NjYxMzA3ODAyMw==