音楽の頭を落とす

RandomAccessFile raf = new RandomAccessFile("input.mp3", "rw"); byte[] buf = new byte[65536]; long pos = 0; int len; Random random = new Random(34); while ((len = raf.read(buf)) != -1) {     for (int i = 0; i < len; i++) {         buf[i] ^= random.nextInt();     }     raf.seek(pos);     raf.write(buf);     pos = raf.getFilePointer(); } raf.close();