public static int readInts(final File f,final LongIndex a,final long offset,final long addend) throws IOException {
  return readInts(f,0,(int)f.length() / 4,a,offset,addend);
}

public static int readInts ( final File f , final LongIndex a , final long offset , final long addend ) throws IOException { return readInts ( f , 0 , ( int ) f . length ( ) / 4 , a , offset , addend ) ; }
read an array of longs from a file .
