Landon Curt Noll
a996f8d2b8
All code blocks in markdown have been intended by at least 4 spaces. We add `--tab-stop=8` to all `pandoc(1)` executions in order to set a better tab stop indentation, especially for tab intended code blocks. Changed `bin/pandoc-wrapper.sh` VERSION from "1.5.3 2024-03-26" to "1.6 2024-03-31". Fixed `1991/brnstnd/sorta.README.md` so that the sorta code is code blocks. Removed unneeded paragraph group in copyright in `inc/footer.default.html`. Fixed excess whitespace after list Author on entry `index.html` page. Changed `bin/output-index-author.sh` VERSION from "1.5.2 2024-03-26" to "1.6 2024-03-31". Performed `make www` to perform the above and test under macOS. TODO: Fix the problem of the initial line of code being extra intended. TODO: Fix excess whitespace around code that is inline.
300 lines
15 KiB
HTML
300 lines
15 KiB
HTML
<!DOCTYPE html>
|
||
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
|
||
<!-- START: two lines up starts content from: inc/top.default.html -->
|
||
|
||
<!-- END: this line ends content from: inc/top.default.html -->
|
||
<!-- START: this line starts content from: inc/head.default.html -->
|
||
|
||
<head>
|
||
<link rel="stylesheet" href="../../ioccc.css">
|
||
<meta charset="utf-8">
|
||
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
|
||
<title>2004/sds - Best Abuse of Indentation</title>
|
||
<link rel="icon" type="image/x-icon" href="../../favicon.ico">
|
||
<meta name="description" content="2004 IOCCC entry sds - Best Abuse of Indentation">
|
||
<meta name="keywords" content="IOCCC, 2004, IOCCC 2004, IOCCC entry, sds, Best Abuse of Indentation">
|
||
</head>
|
||
|
||
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
|
||
<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
|
||
<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
|
||
<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
|
||
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
|
||
|
||
<!-- END: this line ends content from: inc/head.default.html -->
|
||
|
||
<!-- -->
|
||
<!-- This web page was formed via the tool: bin/readme2index.sh -->
|
||
<!-- The content of main section of this web page came from: 2004/sds/README.md -->
|
||
<!-- -->
|
||
|
||
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
|
||
<!-- !!! Do not modify this web page, instead modify the file: 2004/sds/README.md !!! -->
|
||
<!-- !!! Do not modify this web page, instead modify the file: 2004/sds/README.md !!! -->
|
||
<!-- !!! Do not modify this web page, instead modify the file: 2004/sds/README.md !!! -->
|
||
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
|
||
|
||
<!-- Markdown content was converted into HTML via the tool: bin/md2html.sh -->
|
||
|
||
<!-- START: this line starts content from: inc/body.default.html -->
|
||
|
||
<body>
|
||
|
||
<!-- END: this line ends content from: inc/body.default.html -->
|
||
<!-- START: this line starts content from: inc/header.default.html -->
|
||
|
||
<div class="header">
|
||
<img src="../../png/ioccc.png" alt="IOCCC image by Matt Zucker" width=300 height=110>
|
||
<h1>The International Obfuscated C Code Contest</h1>
|
||
<h2>2004/sds - Best Abuse of Indentation</h2>
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/header.default.html -->
|
||
<!-- START: this line starts content from: inc/topnav.mid.html -->
|
||
|
||
<div class="topnav">
|
||
<a class="Left" href="../schnitzi/index.html">← schnitzi</a>
|
||
<a class="Left" href="../index.html">↑ 2004 ↑</a>
|
||
<a class="Left" href="../vik1/index.html">vik1 →</a>
|
||
<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/2004/sds/sds.c">C code</a>
|
||
<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/2004/sds/Makefile">Makefile</a>
|
||
<a class="Right" href="#inventory">Inventory</a>
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/topnav.mid.html -->
|
||
<!-- START: this line starts content from: inc/begin-row.default.html -->
|
||
|
||
<div class="row">
|
||
|
||
<!-- END: this line ends content from: inc/begin-row.default.html -->
|
||
<!-- START: this line starts content from: inc/begin-leftcolumn.default.html -->
|
||
|
||
<div class="leftcolumn">
|
||
|
||
<!-- END: this line ends content from: inc/begin-leftcolumn.default.html -->
|
||
<!-- START: this line starts content from: inc/sidenav.default.html -->
|
||
|
||
<div class="sidenav">
|
||
<a href="#content">Jump to contents</a>
|
||
</div>
|
||
<hr>
|
||
<div class="sidenav">
|
||
<a href="../../index.html">IOCCC Home</a>
|
||
<a href="../../years.html">Winning Entries</a>
|
||
<a href="../../authors.html">People who have won</a>
|
||
<a href="../../location.html">Location of authors</a>
|
||
</div>
|
||
<hr>
|
||
<div class="sidenav">
|
||
<a href="../../news.html">IOCCC News</a>
|
||
<a href="../../status.html">Contest status</a>
|
||
<a href="../../faq.html#submit">How to enter the IOCCC</a>
|
||
<a href="../../faq.html">FAQ</a>
|
||
</div>
|
||
<hr>
|
||
<div class="sidenav">
|
||
<a href="../../bugs.html">Bugs & (mis)features</a>
|
||
<a href="../../faq.html#fix_an_entry">Fixing IOCCC entries</a>
|
||
<a href="../../faq.html#fix_web_site">Fixing the web site</a>
|
||
<a href="../../faq.html#fix_author">Fixing author info</a>
|
||
<a href="../../thanks-for-help.html">Thanks for the help</a>
|
||
</div>
|
||
<hr>
|
||
<div class="sidenav">
|
||
<a href="../../judges.html">The IOCCC Judges</a>
|
||
<a href="../../contact.html">Contacting the IOCCC</a>
|
||
</div>
|
||
<hr>
|
||
<div class="sidenav">
|
||
<a href="#top">Jump to top</a>
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/sidenav.default.html -->
|
||
<!-- START: this line starts content from: inc/end-leftcolumn.default.html -->
|
||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/end-leftcolumn.default.html -->
|
||
<!-- START: this line starts content from: inc/begin-rightcolumn.default.html -->
|
||
|
||
<div class="rightcolumn">
|
||
|
||
<!-- END: this line ends content from: inc/begin-rightcolumn.default.html -->
|
||
<!-- START: this line starts content from: inc/before-content.default.html -->
|
||
|
||
<a name="content"></a>
|
||
|
||
<!-- END: this line ends content from: inc/before-content.default.html -->
|
||
<!-- START: this line starts content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
|
||
|
||
<!-- START: this line starts content generated by: bin/output-index-author.sh -->
|
||
|
||
<h2 id="author"><a name="author"></a>Author:</h2>
|
||
<ul>
|
||
<li>Name: <a href="../../authors.html#Stephen_Sykes">Stephen Sykes</a><br>
|
||
Location: <a href="../../location.html#FI">FI</a> - <em>Republic of Finland </em> (<em>Finland</em>)</li>
|
||
</ul>
|
||
|
||
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
|
||
|
||
<!-- END: this line ends content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
|
||
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
|
||
|
||
<h2 id="to-build">To build:</h2>
|
||
<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a> <span class="fu">make</span></span></code></pre></div>
|
||
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
|
||
<p>The current status of this entry is:</p>
|
||
<pre><code> STATUS: INABIAF - please **DO NOT** fix</code></pre>
|
||
<p>For more detailed information see <a href="../../bugs.html#2004_sds">2004 sds bugs</a>.</p>
|
||
<h2 id="to-use">To use:</h2>
|
||
<div class="sourceCode" id="cb3"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./sds</span></span></code></pre></div>
|
||
<h2 id="try">Try:</h2>
|
||
<div class="sourceCode" id="cb4"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./try.sh</span></span></code></pre></div>
|
||
<h2 id="judges-remarks">Judges’ remarks:</h2>
|
||
<p>Why not use the program to hide another program in the program? It
|
||
must have seemed reasonable at the time.</p>
|
||
<p>The ability to hide a message in plain text is quite charming, really.
|
||
We must admit to a bit of uncertainty about where you’d find such
|
||
messages, or how useful they’d be. Or, of course, whether all those
|
||
horribly badly formatted emails spammers send might contain secret
|
||
messages. Annoyingly, it’s a little too obvious that SOMETHING has
|
||
been done to a message for us to hide one in the remarks. :)</p>
|
||
<h2 id="authors-remarks">Author’s remarks:</h2>
|
||
<p><a href="https://en.wikipedia.org/wiki/Steganography">Steganography</a> is the term for the
|
||
family of techniques used for hiding information within other information.
|
||
Today, it has many real world uses, particularly for digital watermarking.</p>
|
||
<p>This program uses a steganographic technique to hide information in any text
|
||
file. The specific technique used is aimed at writers of obfuscated programs
|
||
for the IOCCC, as the hidden information is encoded in the whitespace in the
|
||
source file. As we know, there are up to an additional 2048 characters of
|
||
whitespace available to entrants to the IOCCC, so it turns out that this is an
|
||
ideal place to hide things.</p>
|
||
<p>The program as provided is the steganographic decoder. Rather than
|
||
provide a separate encoding program, you should not be surprised to
|
||
learn that I opted to steganographically hide the encoder inside the
|
||
decoder.</p>
|
||
<p>Try it out. Compile the program, then type</p>
|
||
<div class="sourceCode" id="cb5"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./sds</span> <span class="op"><</span> sds.c</span></code></pre></div>
|
||
<p>You should see the encoder program displayed. Now save it, like:</p>
|
||
<div class="sourceCode" id="cb6"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./sds</span> <span class="op"><</span> sds.c <span class="op">></span> encoder.c</span></code></pre></div>
|
||
<p>Then compile <code>encoder.c</code>. You now have the complete system ready.</p>
|
||
<p>The encoder expects to get a filename as an argument. This filename
|
||
is the name of the file containing the information to be hidden. It
|
||
expects the file in which to hide the information to be on the
|
||
standard input, and will output the results on the standard output.</p>
|
||
<p>You can use it like this (assuming you have a file called remarks):</p>
|
||
<div class="sourceCode" id="cb7"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a> <span class="bu">echo</span> <span class="st">'Hello, World!'</span> <span class="op">></span> message</span>
|
||
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">./encoder</span> message <span class="op"><</span> remarks <span class="op">></span> remarks_msg</span></code></pre></div>
|
||
<p>Then to decode:</p>
|
||
<div class="sourceCode" id="cb8"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a> <span class="ex">./sds</span> <span class="op"><</span> remarks_msg</span>
|
||
<span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a> <span class="ex">Hello,</span> World!</span></code></pre></div>
|
||
<p>C programs are mostly unaffected by adding steganographic content,
|
||
but it is possible in certain circumstances for whitespace to be
|
||
changed inside strings where it should be left alone. Plain text
|
||
files are good candidates for hiding information in, but the added
|
||
spacing may render the text somewhat difficult to read.</p>
|
||
<h3 id="obfuscation">Obfuscation</h3>
|
||
<p>This program is obfuscated in a number of ways:</p>
|
||
<ul>
|
||
<li>The code is all but impossible to read due to the spacing.</li>
|
||
<li>The algorithm is well hidden in the code due to copious red-herrings.</li>
|
||
<li>The long expressions cause indentation tools to give poor results.</li>
|
||
<li>And good old fashioned ternary operators are the icing on the cake.</li>
|
||
</ul>
|
||
<h3 id="compiling-the-program">Compiling the program</h3>
|
||
<p>The program (and the encoder program) should compile on any
|
||
reasonable compiler. In particular, they are known to compile under
|
||
GNU C.</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/
|
||
|
||
-->
|
||
|
||
<!-- END: this line ends content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
|
||
<!-- START: this line starts content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->
|
||
|
||
<!-- START: this line starts content generated by: bin/output-index-inventory.sh -->
|
||
|
||
<h1 id="inventory-for-2004sds"><a name="inventory"></a>Inventory for 2004/sds</h1>
|
||
<p><a href="#top">Jump to top</a></p>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/sds/sds.c">sds.c</a> - entry source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/sds/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/sds/sds.orig.c">sds.orig.c</a> - original source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/sds/try.sh">try.sh</a> - how to run</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/sds/README_sds.txt">README_sds.txt</a> - sample data used by try.sh</li>
|
||
<li><a href="2004_sds.tar.bz2">2004_sds.tar.bz2</a> - download entry</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="index.html">index.html</a> - entry home page</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/sds/README.md">README.md</a> - markdown source for index.html</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/sds/.entry.json">.entry.json</a> - description of entry in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/sds/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href=".path">.path</a> - directory path from top directory</li>
|
||
</ul>
|
||
|
||
<!-- END: next line ends content generated by: bin/output-index-inventory.sh -->
|
||
|
||
<!-- END: this line ends content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->
|
||
<!-- START: this line starts content from: inc/after-content.default.html -->
|
||
|
||
<!-- END: this line ends content from: inc/after-content.default.html -->
|
||
<!-- START: this line starts content from: inc/end-rightcolumn.default.html -->
|
||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/end-rightcolumn.default.html -->
|
||
<!-- START: this line starts content from: inc/end-row.default.html -->
|
||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/end-row.default.html -->
|
||
<!-- START: this line starts content from: inc/footer.default.html -->
|
||
|
||
<!--
|
||
|
||
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">
|
||
<h2>Copyright and CC BY-SA 4.0 License</h2>
|
||
<p>This file and web page is:</p>
|
||
<blockquote><b>Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.</b></blockquote>
|
||
<p>You are free to share and adapt this file under the terms of this license:</p>
|
||
<blockquote><b>Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)</b></blockquote>
|
||
<p>For more information, see:</p>
|
||
<blockquote><a
|
||
href="https://creativecommons.org/licenses/by-sa/4.0/">https://creativecommons.org/licenses/by-sa/4.0/</a></blockquote>
|
||
<h2>Coda</h2>
|
||
<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2004%2Fsds%2Findex.html">Nu HTML check this web page</a></p>
|
||
<p><a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a></p>
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/footer.default.html -->
|
||
<!-- START: this line starts content from: inc/bottom.default.html -->
|
||
|
||
</body>
|
||
</html>
|
||
|
||
<!-- END: this line ends content from: inc/bottom.default.html -->
|