<?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:----NjgzNjk4Nzg3MzQ5NTEwMiAyMzMwMTI3NTE2NzEyNjgxIDE2MjU0MTg2MzgyNzYzMDc=