#include <stdio.h>
#include <stdbool.h>
#include <malloc.h>
#define H malloc (1237) ;
#define c while
#define W >> /* fallen right tree */
#define w << /* fallen left tree */
#define B(wish,times) ((_ &wish) times 2)
#define L {o Q=q;p(3[Z]),P(false[Z],q),\
p(q>2?"th":N),p(Z[2]);c(true+Q)p(q|Q?Q?\
N:4[Z]:"a "),P(1[Z],Q),p(Q>1?", ":N),--\
Q;p(".\n\n"),++q;}
char typedef o;void typedef d
;
o*N
="";o
q;o*O(o
*p){o
*P,_;o*
f=P=H;c(_
=*p)_^=1,*f
++=B(1,w)|B(4
,W)|B(2,w)|
B(8,W)|(_&240
),++p,*f=false;
return P;}d p(o*f
){fputs(f,stdout);}
d P(o*s,o o){c( o
--){c(122-*s)s++; s
++;}c(122-*s)putchar(
*s++);} o main(void){o*
Z[]={O("hgy}p{}dmnj`{pcg"
"y`{hny{hgh{}gs{}dxdj{"
"dglc{jgj{pdj{dbdxdj{p|d"
"bh{"),O("qeypyg`ld!gj!e!q"
"dey!pydd{p|n!ptypbd!`nxd}{p"
"cydd!Hydjmc!Cdj}{hnty!mnbbw!i"
"gy`"
"}{h"
"gxd"
"!ln"
"b`d"
"j!ygjl}{}gs!ldd}"
"d&e&bewgjl{}dxdj"
"!}|ej}&e&}|gff"
"gjl{dglcp!feg`"
"}&e&fgbogjl{jgjd!be`gd}!`ejmgjl{pdj!bny`}&e&bdeqgjl{"
"dbdxdj!qgqdy}&qgqgjl{p|dbxd!`ytffdy}!`ytffgjl{") ,O (
"!`ew!nh!Mcyg}pfe}!fw!pytd!bnxd!lexd!pn!fd!"),O("Nj!p"
"cd!"),O("!ej`!e!")};L L L L L L L L L L L L /*Xmas*/}
Wednesday, 19 December 2012
..and now something seasonal
The Christmas holidays are almost here and to celebrate I've mildly obfuscated some C that prints the lyrics to a traditional English carol.
The source code can be found here
That's beautiful. Thank you for sharing this!
ReplyDeleteNice!
ReplyDeleteThank you and Merry Christmas!
ReplyDeleteTypos: eight maids, not 'eighth'; ninth day, not 'nineth'
Thanks for spotting the typos. Now fixed. :-)
DeleteI keep on wondering how people can do this... and how much time it would take to do it.
ReplyDeleteIt depends on how obfuscated one wants the code. I just wrote the program and then mangled the array of text a bit and re-encoded it into something unreadable. I then used some standard tricks like using the ternary operator and macros to mangle the code a little more and then it's a simple case of re-formatting the resulting mess into something pretty. I just used some very elementary code obfuscation and all in all it was a couple of hours from start to finish.
DeleteFor a more mangled example, see http://smackerelofopinion.blogspot.co.uk/2011/10/dennis-ritchie-rip.html - this example contains a small stack machine simulator and op-codes to print out a message. This took more effort as the obfuscation is in the actual execution of the code as well as the code layout.