CArchiver::__construct

public function __construct($strArchiveName, $bCompress = false, $start_time = -1, $max_exec_time = -1, $pos = 0, $stepped = false)
{
	$this->io = CBXVirtualIo::GetInstance();

	$this->max_exec_time = $max_exec_time;
	$this->start_time = $start_time;
	$this->file_pos = $pos;
	$this->_bCompress = $bCompress;
	$this->stepped = $stepped;

	if (!$bCompress)
	{
		if (@file_exists($this->io->GetPhysicalName($strArchiveName)))
		{
			if ($fp = @fopen($this->io->GetPhysicalName($strArchiveName), "rb"))
			{
				$data = fread($fp, 2);
				fclose($fp);
				if ($data == "37213")
				{
					$this->_bCompress = true;
				}
			}
		}
		else
		{
			if (mb_substr($strArchiveName, -2) == 'gz')
			{
				$this->_bCompress = true;
			}
		}
	}
	else
	{
		$this->_bCompress = true;
	}

	$this->_strArchiveName = $strArchiveName;
	$this->_arErrors = [];
}