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  1. or download this
    $fh->read($buf, 12);
    # note that your original code used 's', which is signed,
    ...
    my $var4 = $var[2] >> 24;
    my $var5 = $var[3] & 0x3F;
    my $var6 = $var[3] >> 6;
    
  2. or download this
    $"=$,,$_=q>|\p4<6 8p<M/_|<('=>
    .q>.<4-KI<l|2$<6%s!<qn#F<>;$,
    .=pack'N*',"@{[unpack'C*',$_]
    }"for split/</;$_=$,,y[A-Z a-z]
             {}cd;print lc