title: header's structure of .7z files?
body: <p>Looking up in net I could find a general overview of rar format structure.
  <a href="http://www.rarlab.com/technote.htm" rel="noreferrer">http://www.rarlab.com/technote.htm</a></p>
  
  <p>But what would I be glad to be informed is how 7z files are segmented block by block. </p>
  
  <p>thanks.</p>