[Solovei95]

Прошу проверить arraybuffer Reader

(function(global){

var FOpen = function(arraybuffer){
  this.bin = arraybuffer;
  this.off = 0;
}

FOpen.prototype.read = function(b,l,o){
  if(!o) o = 0;
  if(!l) l = b.lenght;
  var u8 = new Uint8Array(this.bin,this.off,l);
  b.set(new b.constructor(new Uint8Array(u8).buffer),o);
  this.off += l;
}

FOpen.prototype.seek = function(l){
  this.off += l;
}

global.FOpen = FOpen;

})(this);