DNA japh

'Drew' a little more inspiration from liverpole's Cyclical japh.

#!/usr/bin/perl 

$_=                                              q#sub'C{25+
20*c  AAAAAAAAAAAAAAAAAAAAAA  TTTTTTTTTTTTTTTTTTT   os(pop()*
2/pop)                                                 }for(0
..1638){$                                                T[$_
 ][C(14,$_)]                                               =$
   T[$_][C(14,$_ CCCCCCCCCCCCC  GGGGGGGGGGGGGGGGGGGGGGG  +21)
      ]="\e[1mo\e[0m                                   "}$C=$
        T=$l=$f=0;sub'g{                             ($d,$s)=
            @_;my$l=(length$s                     )+1;$p='-'x
                (int($d/$l)-1);my$TTTTT  AAAAAAn;for(split/
                    /,$s){$n.=$p.$_}$n.    =$p;$n=~s/-([\
                         w,])-/G$1G/g;$n=$l>$d?substr(
                              $n,int(($l-$d)/2),$d)
                              :$n;while($d>=length$
                          n){($n='-'.$n)..($n=$n.'-')}
                    split//,$n}sub'T{       print"\e[2J\e
                [0;1f\n"}sub'A{$                g=0;@g=();m
            ap{push@g,${g}if                       $_;$g++}@
         {pop@_};($g[1]   AAAAAAAAAAAAA  TTTTTTTTTTTTT-$g[0])
      }T;forG$A(@T                                      ){$c=
   qw(tsuJG-G-G                                           -Gr
 ehtonaG-G-                                                G-
GlrePG-G  CCCCCCCCCCCCCCCCCCCC  GGGGGGGGGGGGGGGGGGGGGGGG -G-G
,rekc                                                   ahG-G
-G-                                                   )[$C%20
];                                                 $T=0;@A=g
(A  TTTTTTTTTTTTTTTTTTTTT  AAAAAAAAAAAAAAAAAAA  ($A),$c);fo
r(@{                                        $A}){print$_?
do{$T=                                   $T&&${l}ne$_?
0:1;$l=$_                           }&&$_:$T?!($C%4
 )?do{$^=pop GGGGGGG  CCCCCCCC @A;'^'eq${^}?'G'
   :$^}||'-':'            G':'G'}print"\n";
      $C++;if(!($C%20)){select$y,$y,$
         y,.08;T}}#,s*[ATCG]{2,}**g
           ,s,\s+,,g,s,G, ,g,
        eval $_ && chargrill #
[download]

There are two ways your eyes can interpret what you're seeing when you run this - it will either appear to be scrolling, or rotating. I've tried to provide enough visual cues to help you see the latter. If, try as you might you're still only able to see it as scrolling, try to just concentrate on the first line.

Windows users might need to (save the code above as "dna.pl" and) use the following invocation:

$ perl -MWin32::Console::ANSI dna.pl
[download]

Most of the obfuscations of this nature ($somevar=q"compactedOrWhitespacedCode";s/\s+//;eval;) can generally be picked apart with something like:

$ sed 's/eval/print/' obfu.pl | perl | perl -MO=Deparse
[download]

I was a little surprised to find out I couldn't quite do that with this one due to a last minute formatting change (namely, that I didn't have enough code to complete the last line in the picture!). How to modify the above command line to see the meat of the code is left as an exercise for the reader.

Update: Hah, I noticed my unintentional pun in the first sentence :-D

--chargrill

s**lil*;  $*=join'',sort split q**;  s;.*;grr; &&s+(.(.)).+$2$1+; $; =
qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/)
[download]

Comment on DNA japh Select or Download Code

Replies are listed 'Best First'.
Re: DNA japh by liverpole (Monsignor) on Nov 20, 2006 at 14:42 UTC
Terrific as always! ++chargrill It's interesting that, as you've noted ... ... your trick (or should I say "my trick"? :-)) of: `sed 's/eval/print/' obfu.pl \| perl \| perl -MO=Deparse` [download] doesn't work here. But a very simple alternative is to "protect" the `eval`, after it becomes `print`, from the `&& chargrill` following it with: `sed 's/eval/print#/' obfu.pl \| perl \| perl -MO=Deparse` [download] s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/	[reply] [d/l] [select]
Re^2: DNA japh by chargrill (Parson) on Nov 20, 2006 at 16:26 UTC
Did I first pick up that trick from you? I think perhaps I did. However, it is an exceedingly helpful trick to figure out why ... ... sometimes the 'transformation' doesn't work quite right due to some misunderstanding of how something gets parsed. More often than not, I find myself having some whitespace required, whether it is because I'm using an `ne` or an `or` or the `x` operator on something I'm converting to an `int`. Or something similar. It's always helpful to run the code in progress through some mechanism like this to ensure that it will compile (the extra trip through B::Deparse implements a `-c` style check). So step 1 is - did B::Deparse pick up all the code, and if so, step 2 is - does the code still resemble the original intended code? While your spin on the sed regex works, my solution was a bit more 'brute force': `$ sed 's/eval./print/' obfu.pl \| perl \| perl -MO=Deparse` [download] --chargrill `slil; $=join'',sort split q; s;.;grr; &&s+(.(.)).+$2$1+; $; = qq-$_-;s,.,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$,$/)` [download]	[reply] [d/l] [select]
Re^3: DNA japh by liverpole (Monsignor) on Nov 20, 2006 at 16:39 UTC
Yes, I first told you about that trick with regard to this Japh. s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/	[reply]


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