Example single-line level file format for Flash

gistfile1.as

var VERSION:String = "B";

function dataToString (tiles:BitmapData):String
{
	var i:int;
	var j:int;
	var tile:uint;
	var bytes:ByteArray = new ByteArray;
	
	for (i = 0; i < tiles.width; i++) {
		for (j = 0; j < tiles.height; j++) {
			tile = tiles.getPixel(i, j);
			
			bytes.writeByte(tile);
		}
	}
	
	bytes.compress();
	
	return VERSION + Base64.encode(bytes);
}

function stringToData (data:String):BitmapData
{
	var version:String = data.charAt(0);
	
	data = data.substring(1);
	
	var tiles:BitmapData = new BitmapData(10, 10, false, 0x0);
	
	var i:int;
	var j:int;
	var tile:uint;
	var bytes:ByteArray;
	
	bytes = Base64.decode(data);
	
	bytes.writeUTFBytes(data); // I can't remember what this does or if it should be here :)
	
	bytes.uncompress();
	
	for (i = 0; i < tiles.width; i++) {
		for (j = 0; j < tiles.height; j++) {
			tile = bytes.readByte();
			
			tiles.setPixel(i, j, tile);
		}
	}
	
	return tiles;
}