title: what does 16bit offset and 24 bit offset mean? how do i do such calculations using java
body: <p>I have a spec which reads the column specifies  a 16 bit offset to a structure and another column specifies a 24 bit offset to a structure. I am implementing the spec using java.
  I am not clear of what 16 bit offset /24 bit offset means and how to perform such operation in java. </p>