I'm writing my own obfuscated atob/btoa v5 converter, and am trying to capture the output from dc (which does some of the dirty work). I'm half tempted to call myself again inside a pipe to convert the file... but here's what I have so far (with explination):

#!/usr/bin/perl -0777
$f=<STDIN>;  #suck the whole file in.
        $d='16i[[z]P]sZ[[y]P]sY[la55~21+Sb55~21+Sb55~21+Sb55~21+'.
   'Sb21+PLbPLbPLbPLbP]sX[?dsa0=Zla20202020=YlXxlAx]dsAx';
# DC Code.  Basically take a 4 byte word and encode it into 
# 5 bytes.  Until it gets the signal to quit, of course.

open(DC,"|dc -e '$d' > out.d8a"); # open up DC
while($f) {
   $f=~s/^(.{0,4})//s; $z=$1; $l+=length $z; # grab 4 bytes
   $z.="\0" while((length $z) < 4); # pad it to spec
   $z=unpack("H*",$z); print DC "\U$z\E\n"; # send it to DC
   }
print DC "q\n";  # tell DC to quit.

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In reply to Caputuring output while inputting to dc... by strredwolf

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