The sections have been modified a fair amount. The Entries menu has been extended to have: Fixing entries, Updating author info, Thanks for the help. The first two were moved from FAQ and the last one from About. The rationale for these, in order: entries and authors have to do with entries and most of the help involves entries. It also has to do with website but in 'about' it does not seem the right place, unless maybe it is renamed to 'Credits' or something (I am not suggesting this one way or the other). This one is debatable but that was the rationale. The Status menu has been extended to have: Markdown guidelines and Security policy. The rationale is that the markdown guidelines are part of contest guidelines and the security policy is about the status of the entries and how if there are any security problems they will not be addressed (instead of about the IOCCC). The FAQ was extended to have: Compiling entries, Running entries, How to help. The reason to not have compiling and running entries under Entries is because this is 'how to' and also the menu was too long. How to help seems like a good idea under FAQ too (was in About). About was extended to have the new 'about.html' page (from about.md). This is a rare case where a new file is useful as it fits under 'About'. The menu now is: Home page, About the IOCCC, The Judges, Contact us. I was pondering the 'About [the IOCCC]' at the top and also naming it 'About us' but it seemed like a link to index.html was necessary and as for 'about us' it seemed less clear as to whether it was about the judges or the contest itself. The FAQ has been updated slightly for this. After further inspection the bin/index.html and the inc/index.html links were removed from the about section. With these changes, renaming an item or slight reordering notwithstanding, I believe that #2006 is probably in good shape.
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Rules and guidelines
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Markdown guidelines
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headerCloseMenuButton.addEventListener("click", () => {
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mobileMenuPanel.classList.add("hide-content");
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mobileMenuPanel.classList.remove("topbar-mobile-panel");
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<div class="header">
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<a href="../../2011/zucker/index.html">
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<img src="../../png/ioccc.png"
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alt="IOCCC image by Matt Zucker"
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width=300
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height=110>
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</a>
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2012/vik - Bronze Award - Best use of cocoa</h2>
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<h3>Steganography</h3>
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</div>
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<div class="navbar">
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<a class="Left" href="../tromp/index.html">← 2012/tromp</a>
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<a class="Left" href="../index.html">↑ 2012 ↑</a>
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<a class="Left" href="../zeitak/index.html">2012/zeitak →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/vik/vik.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/vik/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2012%2Fvik%2Findex.html">✓</a>
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</div>
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<h2 id="author">Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Daniel_Vik">Daniel Vik</a><br>
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Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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<h2 id="to-build">To build:</h2>
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<pre><code> make</code></pre>
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<p>This entry requires <a href="https://www.zlib.net">Zlib</a>. See the
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||
FAQ on “<a href="../../faq.html#zlib">zlib</a>”.</p>
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<p>There is an alternate version which might work for Windows. See <a href="#alternate-code">Alternate
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code</a> section below.</p>
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<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
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<p>The current status of this entry is:</p>
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<blockquote>
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<p><strong>STATUS: INABIAF - please DO NOT fix</strong></p>
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</blockquote>
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<p>For more detailed information see <a href="../../bugs.html#2012_vik">2012/vik in bugs.html</a>.</p>
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<h2 id="to-use">To use:</h2>
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<p>To embed text (from file or command line):</p>
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<pre><code> ./vik e base.png filename > encodedimg.png</code></pre>
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<p>or</p>
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<pre><code> ./vik e base.png SomeRandomText > encodedimg.png</code></pre>
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<p>To extract the embedded text:</p>
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<pre><code> ./vik d encodedimg.png</code></pre>
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<p>To embed a PNG into another:</p>
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<pre><code> ./vik e base.png source.png > encodedimg.png</code></pre>
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<p>To extract the embedded PNG:</p>
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<pre><code> ./vik d encodedimg.png > restored.png</code></pre>
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<h2 id="try">Try:</h2>
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<pre><code> ./try.sh</code></pre>
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<h2 id="alternate-code">Alternate code:</h2>
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<p>For those few who might use Windows this alternate code might work.</p>
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<h3 id="alternate-build">Alternate build:</h3>
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<pre><code> make alt</code></pre>
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<h3 id="alternate-use">Alternate use:</h3>
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<p>Use <code>vik.alt</code> as you would <code>vik</code> above.</p>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>References to chocolate had no effect on judging this entry. We
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guarantee it.</p>
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<p>Can you discern hidden pieces of chocolate in:</p>
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<p><img src="chocolate.png"
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alt="image of peices of chocolate candy"
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width=300 height=110></p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
|
||
<h3 id="introduction">Introduction</h3>
|
||
<p>This program is a <a href="https://en.wikipedia.org/wiki/Steganography">steganography</a>
|
||
application for embedding an image or text into another image as well as
|
||
extracting the embedded image or text back. The program stores the embedded
|
||
image or text in the low bits of the RGB values.</p>
|
||
<p>The program supports any 8 bit true color PNG images (RGB, RGBA, greyscale,
|
||
and greyscale+alpha). The output image is always 8 bit RGB. When embedding
|
||
one image into another, the width and height needs to be the same.</p>
|
||
<p>The program only updates the <code>IDAT</code> and <code>IHDR</code> chunks of the source image. Any
|
||
additional chunks are copied into the resulting image.</p>
|
||
<h3 id="bonus-extractor">Bonus Extractor:</h3>
|
||
<p>For some reason the chocolate image seems to have some special properties.
|
||
Apart from being quite big and a little bit noisy, it appears that when embedded
|
||
into another image and extracted, the bitmap data is also a valid
|
||
<a href="https://en.wikipedia.org/wiki/Brainfuck">brainfuck</a> program. It is of course
|
||
possible to get the bitmap data from the extracted image, and run it through any
|
||
of the previous winning brainfuck interpreters, but I thought it would be easier
|
||
to include an interpreter in the program to avoid the hassle:</p>
|
||
<pre><code> ./vik e ioccc.png chocolate.png > encodedimg.png
|
||
./vik b encodedimg.png</code></pre>
|
||
<p>It is of course also possible to embed a
|
||
<a href="https://en.wikipedia.org/wiki/Brainfuck">brainfuck</a> program as a text file
|
||
(as explained above) and decode it, e.g.:</p>
|
||
<pre><code> ./vik e ioccc.png .+[.+] > encodedimg.png
|
||
./vik b encodedimg.png</code></pre>
|
||
<h3 id="obfuscation">Obfuscation</h3>
|
||
<p>I really wanted to keep the program simple, so instead of adding multiple macros
|
||
or helper methods that can be confusing, I placed all functionality in the
|
||
<code>main()</code> function. <code>main()</code> is called recursively and quite extensively, but it
|
||
gives the benefit that all invocations of the function have the same parameters,
|
||
<code>argv</code> and <code>argc</code>. This really helps readability, as a programmer doesn’t need
|
||
to remember several variable or function names. I also tried to reduce the
|
||
number of keywords, and the program only has four <code>for</code> loops followed by a single
|
||
<code>return</code> statement. There is a little bit of use of the ternary (<code>?:</code>) operator,
|
||
but this is really there to keep the program as simple as possible.</p>
|
||
<h3 id="portability">Portability</h3>
|
||
<p>The program is portable to most platforms that have <a href="https://www.zlib.net">zlib</a>
|
||
available. The only system dependency is that the program relies on writing
|
||
binary data to <code>stdout</code>.</p>
|
||
<p>By default, Microsoft compilers adds carriage returns to new lines, and to
|
||
compile the program on this platform, the following line can be added after
|
||
the variable declarations in the main declaration in order to run
|
||
correctly:</p>
|
||
<pre><code> _setmode(_fileno(stdout), 0x8000);</code></pre>
|
||
<p><strong>NOTE</strong>: this is what the <a href="#alternate-code">Alternate code</a> does.</p>
|
||
<h3 id="limitations">Limitations</h3>
|
||
<p>The program doesn’t have many error checks so passing in invalid arguments
|
||
or images of mismatching sizes, or unsupported pixel formats will cause the
|
||
program to crash.</p>
|
||
<h3 id="extendability">Extendability</h3>
|
||
<p>Since a lot of care was taken to keep the code simple, it turned out to be
|
||
quite easy to extend functionality. I did include a small
|
||
<a href="https://en.wikipedia.org/wiki/Brainfuck">brainfuck</a> after I
|
||
realized that the chocolate image had some interesting properties.</p>
|
||
<p>But there is more functionality I added that didn’t fit within the size
|
||
limits and could not remain included. For example, I added a method to
|
||
format source code based on a PNG image. So the format of the program is
|
||
actually done by the program itself.</p>
|
||
<p>And to be honest, the chocolate image did not have a
|
||
<a href="https://en.wikipedia.org/wiki/Brainfuck">brainfuck</a> program
|
||
embedded to begin with. I added functionality to the program to embed a
|
||
brainfuck into a PNG image and used it to create the image provided with
|
||
the entry.</p>
|
||
<p>I also added a method to analyze PNG images, to print the size and format,
|
||
as well as the scan line filters.</p>
|
||
<p>All these features were quite easy to add, much thanks to the (actually
|
||
pretty good) design of the code.</p>
|
||
<!--
|
||
|
||
Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
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|
||
|
||
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|
||
|
||
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|
||
|
||
<div id="inventory">
|
||
<h1 id="inventory-for-2012vik">Inventory for 2012/vik</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/vik/vik.c">vik.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/vik/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/vik/vik.alt.c">vik.alt.c</a> - alternate source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/vik/vik.orig.c">vik.orig.c</a> - original source code</li>
|
||
<li><a href="chocolate.png">chocolate.png</a> - message or image encoded in picture of chocolate candy</li>
|
||
<li><a href="ioccc.png">ioccc.png</a> - message or image encoded in ioccc image</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/vik/try.sh">try.sh</a> - script to try entry</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="2012_vik.tar.bz2">2012_vik.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/vik/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/vik/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/vik/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/vik/.path">.path</a> - directory path from top level directory</li>
|
||
<li><a href="index.html">index.html</a> - this web page</li>
|
||
</ul>
|
||
<hr style="width:10%;text-align:left;margin-left:0">
|
||
<h4>
|
||
Jump to: <a href="#">top</a>
|
||
</h4>
|
||
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|
||
</div>
|
||
|
||
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|
||
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|
||
|
||
<!--
|
||
|
||
Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
|
||
<div class="footer">
|
||
|
||
<div id="copyright"><h3>Copyright © 1984-2024 by Landon Curt Noll:
|
||
<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
|
||
<p>
|
||
This work is <b>licensed by Landon Curt Noll</b> under
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
|
||
target="_blank"
|
||
rel="license noopener noreferrer"
|
||
style="display:inline-block;">CC BY-SA 4.0</a></b>.
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/cc.png"
|
||
alt="cc inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/by.png"
|
||
alt="person inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/sa.png"
|
||
alt="arrow looping back on itself inside circle symbol"><br>
|
||
You should <b>carefully review</b> the
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
|
||
before using the licensed material.<br>
|
||
You may wish to review the
|
||
<b><a href="../../license.html"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
|
||
of <b>CC BY-SA 4.0</b>.<br>
|
||
</p>
|
||
</div>
|
||
|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
||
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2012%2Fvik%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
|
||
<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
|
||
</p>
|
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</div>
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</div>
|
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</body>
|
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</html>
|
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|
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