<?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:----NjIxMTE2MDk3MTMxMTU5NyA1NDMzOTEzODg0MTM0MzM2IDY5NzkyNzkwMjgwNjQzMjA=