public void update96(IntBuffer buf) {
    buf.get(v, 0, 3);
    v[3] = 0;
    updateCount();
  }
Updates the value of this object by reading from ByteBuffer, receiving only
96 bits data.

@param buf
         ByteBuffer to read values from
common/src/java/org/apache/hadoop/hive/common/type/UnsignedInt128.java