protected function setTypeConstraints($signature)
	{
		// Amiga version of IFF
		if ($signature === 'FORM')
		{
			$this->btmhd = self::IFF_AMIGA_BTMHD;
			$this->btmhdSize = self::LONG_SIZE;
			$this->byteType = self::PACK_UNSIGNED_SHORT;
		}
		// Maya version
		else
		{
			$this->btmhd = self::IFF_MAYA_BTMHD;
			$this->btmhdSize = self::LONG_SIZE * 2;
			$this->byteType = self::PACK_UNSIGNED_LONG;
		}
	}