clrghouz/app/Classes/File/Mail.php

<?php

namespace App\Classes\File;

use Carbon\Carbon;

use App\Classes\FTN\Packet;

class Mail extends Item
{
	private Packet $file;

	/**
	 * @throws \Exception
	 */
	public function __construct(Packet $mail,int $action)
	{
		$this->action |= $action;

		switch ($action) {
			case self::I_SEND:
				$this->file = $mail;
				$this->file_name = sprintf('%08x.pkt',Carbon::now()->timestamp);
				$this->file_size = strlen($mail);
				$this->file_mtime = Carbon::now()->timestamp;	// @todo This timestamp should be consistent incase of retries

				break;

			default:
				throw new \Exception('Unknown action: '.$action);
		}
	}

	public function read(int $start,int $length): string
	{
		return substr((string)$this->file,$start,$length);
	}
}