Shortener

shortener.js

var letras = [0,1,2,3,4,5,6,7,8,9,'A','a','B','b','C','c','D','d','E','e','F','f','G','g','H','h','I','i','J','j','K','k','L','l','M','m','N','n','O','o','P','p','Q','q','R','r','S','s','T','t','U','u','V','v','W','w','X','x','Y','y','Z','z'];
  
function encode_shortener(num){                                                
  var t = letras.length;                                                       
  
  var shorten = '';                                                            
  while(num > 0){                                                              
    var div = Math.floor(num / t);                                             
    var res = num - div * t;                                                   
  
    shorten += letras[res];                                                    
  
    num = div;                                                                 
  }
  return shorten;                                                              
} 

                                                                               
function decode_shortener(phrase){
  var t = letras.length;                                                       
  var position = create_dic_letras();                                          
  
  var total = 0;
  $.each(phrase,function(i,l){                                                 
    total += position[l] * Math.pow(t,i);                                      
  });                                                                          
  return total; 
}                                                                              
    
function create_dic_letras(){                                                  
  var letras_hash = {};                                                        
  $.each(letras,function(i,l){                                                 
    letras_hash[l] = i;                                                        
  });                                                                          

  return letras_hash;
}