For us to be able to help you, you'll have to tell us more.
I also have the structure available which tells me what the first 8 bytes are, then the next 4 bytes and so on.
A good start would be to show us what that "structure" looks like. What form is it in? How do you get it into your perl program?
I tried doing it through unpack function available in perl but i am stuck on how to get the first 8 bytes then the next 8 bytes and so on..
If you show us what you tried (post your non-working code here (don't forget the <code></code> tags), then it serves as a starting point from which we can guide you.
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