unit conversion in awk

gistfile1.txt

function atoix(a) {
  if(a~/Pi?B/) return int(a)*1024^5;
  if(a~/Ti?B/) return int(a)*1024^4;
  if(a~/Gi?B/) return int(a)*1024^3;
  if(a~/Mi?B/) return int(a)*1024^2;
  if(a~/Ki?B/) return int(a)*1024^1;
  return int(a);
}

function itoax(i) {
  if(i>1024^5&&i<=1024^6) return sprintf("%.2fPB", i/1024^5);
  if(i>1024^4&&i<=1024^5) return sprintf("%.2fTB", i/1024^4);
  if(i>1024^3&&i<=1024^4) return sprintf("%.2fGB", i/1024^3);
  if(i>1024^2&&i<=1024^3) return sprintf("%.2fMB", i/1024^2);
  if(i>1024^1&&i<=1024^2) return sprintf("%.2fKB", i/1024^1);
  return sprintf("%dB", i);
}