docs: function sleuth_fat(idx, cnt, sectors, ssz, fat_addrs) {
  	var q = ENDOFCHAIN;
  	if(idx === ENDOFCHAIN) {
  		if(cnt !== 0) throw new Error("DIFAT chain shorter than expected");
  	} else if(idx !== -1 /*FREESECT*/) {
  		var sector = sectors[idx], m = (ssz>>>2)-1;
  		if(!sector) return;
  		for(var i = 0; i < m; ++i) {
  			if((q = __readInt32LE(sector,i*4)) === ENDOFCHAIN) break;
  			fat_addrs.push(q);
  		}
  		sleuth_fat(__readInt32LE(sector,ssz-4),cnt - 1, sectors, ssz, fat_addrs);
  	}
  }