901 

   902     /**

   903      * Probe the first few bytes of the keystore data stream for a valid

   904      * JCEKS keystore encoding.

   905      */

   906     @Override

   907     public boolean engineProbe(InputStream stream) throws IOException {

   908         DataInputStream dataStream;

   909         if (stream instanceof DataInputStream) {

   910             dataStream = (DataInputStream)stream;

   911         } else {

   912             dataStream = new DataInputStream(stream);

   913         }

   914 

   915         return JCEKS_MAGIC == dataStream.readInt();

   916     }