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Specification datasize
enrich
   eraseblock
with
   

   
   
   functions  datasize : buffer → nat;
              datasize : buffer × nat → nat;
   
   
   
   
   

   

   axioms datasize :  ⊦ datasize(buf) = datasize(buf, # buf);
          used for: ls;
          datasize-base :  ⊦ datasize(buf, 0) = 0;
          used for: s, ls;
          datasize-rec :  ⊦ datasize(buf, n + 1) = (buf[n] = empty ⊃ datasize(buf, n);n + 1);
          used for: ls;

   

   
end enrich