protected function getIffSignature($data)
	{
		$signature = substr($data, 0, self::LONG_SIZE);

		// Check if image is IFF
		if ($signature !== self::IFF_HEADER_AMIGA && $signature !== self::IFF_HEADER_MAYA)
		{
			return false;
		}
		else
		{
			return $signature;
		}
	}