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<h1>The International Obfuscated C Code Contest</h1>
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<h2>1998/tomtorfs - Best self-documenting</h2>
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<h3>CRC generator</h3>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1998/tomtorfs/tomtorfs.orig.c">Original C</a>
|
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F1998%2Ftomtorfs%2Findex.html">✓</a>
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<h2 id="author">Author:</h2>
|
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<ul>
|
||
<li>Name: <a href="../../authors.html#Tom_Torfs">Tom Torfs</a><br>
|
||
Location: <a href="../../location.html#BE">BE</a> - <em>Kingdom of Belgium</em> (<em>Belgium</em>)</li>
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<!-- BEFORE: 1st line of markdown file: 1998/tomtorfs/README.md -->
|
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<h2 id="to-build">To build:</h2>
|
||
<pre><code> make all</code></pre>
|
||
<h2 id="to-use">To use:</h2>
|
||
<pre><code> ./tomtorfs filename bitwidth polynom reflected init xor</code></pre>
|
||
<p>where:</p>
|
||
<ul>
|
||
<li><code>filename</code>
|
||
<ul>
|
||
<li>file to calculate the CRC of</li>
|
||
</ul></li>
|
||
<li><code>bitwidth</code>
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||
<ul>
|
||
<li>width of the CRC in bits (decimal)</li>
|
||
</ul></li>
|
||
<li><code>polynom</code>
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<ul>
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<li>polynomial used for the CRC (hexadecimal)</li>
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</ul></li>
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<li><code>reflected</code>
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<ul>
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<li>0 if the CRC is not reflected, 1 if it is</li>
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</ul></li>
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<li><code>init</code>
|
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<ul>
|
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<li>initial value for the CRC (hexadecimal)</li>
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</ul></li>
|
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<li><code>xor</code>
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<ul>
|
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<li>value to xor the final CRC with (hexadecimal)</li>
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</ul></li>
|
||
</ul>
|
||
<h2 id="try">Try:</h2>
|
||
<pre><code> ./try.sh</code></pre>
|
||
<h2 id="judges-remarks">Judges’ remarks:</h2>
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||
<p>If you don’t believe the program is correct, try and compare the output
|
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of the program with the value of CRCs computed by PKZIP or any other
|
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archiver that uses the CRC-32 algorithm.</p>
|
||
<h2 id="authors-remarks">Author’s remarks:</h2>
|
||
<p>Usage:</p>
|
||
<pre><code> ./tomtorfs filename bitwidth polynom reflected init xor</code></pre>
|
||
<p>where:</p>
|
||
<ul>
|
||
<li><code>filename</code>
|
||
<ul>
|
||
<li>file to calculate the CRC of</li>
|
||
</ul></li>
|
||
<li><code>bitwidth</code>
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||
<ul>
|
||
<li>width of the CRC in bits (decimal)</li>
|
||
</ul></li>
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||
<li><code>polynom</code>
|
||
<ul>
|
||
<li>polynomial used for the CRC (hexadecimal)</li>
|
||
</ul></li>
|
||
<li><code>reflected</code>
|
||
<ul>
|
||
<li>0 if the CRC is not reflected, 1 if it is</li>
|
||
</ul></li>
|
||
<li><code>init</code>
|
||
<ul>
|
||
<li>initial value for the CRC (hexadecimal)</li>
|
||
</ul></li>
|
||
<li><code>xor</code>
|
||
<ul>
|
||
<li>value to xor the final CRC with (hexadecimal)</li>
|
||
</ul></li>
|
||
</ul>
|
||
<h3 id="examples">Examples</h3>
|
||
<h4 id="crc-16">CRC-16:</h4>
|
||
<pre><code> ./tomtorfs filename 16 1021 0 FFFF 0000</code></pre>
|
||
<h4 id="crc-32">CRC-32:</h4>
|
||
<pre><code> ./tomtorfs filename 32 04C11DB7 1 FFFFFFFF FFFFFFFF</code></pre>
|
||
<h4 id="xmodem">XMODEM:</h4>
|
||
<pre><code> ./tomtorfs filename 16 8408 1 0000 0000</code></pre>
|
||
<h4 id="arc">ARC:</h4>
|
||
<pre><code> ./tomtorfs filename 16 8005 1 0000 0000</code></pre>
|
||
<h3 id="portability-notes">Portability notes</h3>
|
||
<p>The program assumes <code>CHAR_BIT==8</code>. Results are undefined if <code>bitwidth > sizeof(unsigned long) * 8</code>. It is also assumed that <code>EOF</code> is <code>-1</code> and <code>1</code> is a
|
||
valid exit value to indicate failure (replace them with <code>EOF</code> resp.
|
||
<code>EXIT_FAILURE</code> if the assumptions are false). Otherwise ANSI/ISO C.</p>
|
||
<p>No special build options required.</p>
|
||
<h3 id="special-notes">Special notes</h3>
|
||
<p>Count the number of non-whitespace characters in the source
|
||
file to find out what dark force drove me to write this ;-).</p>
|
||
<h3 id="notice-to-those-who-wish-for-a-greater-challenge">NOTICE to those who wish for a greater challenge:</h3>
|
||
<p><strong>If you want a greater challenge, don’t read any further</strong>:
|
||
just try to understand the program via the source.</p>
|
||
<p>If you get stuck, come back and read below for additional hints and information.</p>
|
||
<h3 id="how-this-entry-works">How this entry works:</h3>
|
||
<p>First of all, if you run a C beautifier on the program (thereby of course losing
|
||
the nice code shape I worked so hard on ;-) ) the code will become a bit more
|
||
readable.</p>
|
||
<p>The variable names are not very descriptive. They have the
|
||
following meanings:</p>
|
||
<ul>
|
||
<li><code>a</code>
|
||
<ul>
|
||
<li>argc</li>
|
||
</ul></li>
|
||
<li><code>A</code>
|
||
<ul>
|
||
<li>argv</li>
|
||
</ul></li>
|
||
<li><code>b</code>
|
||
<ul>
|
||
<li>array of <code>unsigned long</code> variables:</li>
|
||
<li><code>b[0]</code>
|
||
<ul>
|
||
<li>bit-width of the CRC (<code>argv[2]</code>)</li>
|
||
</ul></li>
|
||
<li><code>b[1]</code>
|
||
<ul>
|
||
<li>CRC polynomial (<code>argv[3]</code>)</li>
|
||
</ul></li>
|
||
<li><code>b[2]</code>
|
||
<ul>
|
||
<li>nonzero if CRC is reflected (argv[4])</li>
|
||
</ul></li>
|
||
<li><code>b[3]</code>
|
||
<ul>
|
||
<li>initial value of CRC (argv[5])</li>
|
||
</ul></li>
|
||
<li><code>b[4]</code>
|
||
<ul>
|
||
<li>value final CRC is XORed with (argv[6])</li>
|
||
</ul></li>
|
||
<li><code>b[5]</code>
|
||
<ul>
|
||
<li>CRC value</li>
|
||
</ul></li>
|
||
<li><code>b[6]</code>
|
||
<ul>
|
||
<li>byte from file</li>
|
||
</ul></li>
|
||
<li><code>b[7]</code>
|
||
<ul>
|
||
<li>counter</li>
|
||
</ul></li>
|
||
</ul></li>
|
||
<li><code>B</code>
|
||
<ul>
|
||
<li><code>FILE *</code> through which the file <code>argv[1]</code> is opened</li>
|
||
</ul></li>
|
||
<li><code>C</code>
|
||
<ul>
|
||
<li><code>typedef</code> for <code>unsigned long</code></li>
|
||
</ul></li>
|
||
</ul>
|
||
<p>The first <code>for</code> loop simply reads the command-line arguments
|
||
in the <code>b[]</code> array. The third parameter to <code>strtoul(3)</code> causes
|
||
all arguments to be in base-16 (hex) except the first one,
|
||
which will be in base-10 (decimal).</p>
|
||
<p>The rest of the program “simply” calculates the CRC in <code>b[5]</code>
|
||
and then prints it to <code>stdout</code>. The bit reflection loops may
|
||
appear a bit tricky at first, but if you have a good look
|
||
at them they should become obvious also.</p>
|
||
<h3 id="acknowledgments">Acknowledgments:</h3>
|
||
<p>Ross N. Williams, whose CRC guide was very useful to me
|
||
for writing this. You can find it in <a href="crc.txt">crc.txt</a>.</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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|
||
<div id="inventory">
|
||
<h1 id="inventory-for-1998tomtorfs">Inventory for 1998/tomtorfs</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/tomtorfs/tomtorfs.c">tomtorfs.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/tomtorfs/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/tomtorfs/tomtorfs.orig.c">tomtorfs.orig.c</a> - original source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/tomtorfs/try.sh">try.sh</a> - script to try entry</li>
|
||
<li><a href="crc.txt">crc.txt</a> - painless guide to CRC algorithms</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="1998_tomtorfs.tar.bz2">1998_tomtorfs.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/tomtorfs/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/tomtorfs/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/tomtorfs/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1998/tomtorfs/.path">.path</a> - directory path from top level directory</li>
|
||
<li><a href="index.html">index.html</a> - this web page</li>
|
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</ul>
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||
<hr style="width:10%;text-align:left;margin-left:0">
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<h4>
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Jump to: <a href="#">top</a>
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<!--
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Copyright © 1984-2025 by Landon Curt Noll. All Rights Reserved.
|
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|
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You are free to share and adapt this file under the terms of this license:
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|
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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-->
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<div class="footer">
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<div id="copyright"><h3>Copyright © 1984-2025 by Landon Curt Noll:
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<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
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||
<p>
|
||
This work is <b>licensed by Landon Curt Noll</b> under
|
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<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
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||
target="_blank"
|
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rel="license noopener noreferrer"
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style="display:inline-block;">CC BY-SA 4.0</a></b>.
|
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<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
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src="../../png/cc.png"
|
||
alt="cc inside circle symbol">
|
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<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
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src="../../png/by.png"
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alt="person inside circle symbol">
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<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
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src="../../png/sa.png"
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alt="arrow looping back on itself inside circle symbol"><br>
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You should <b>carefully review</b> the
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<b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
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target="_blank"
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rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
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before using the licensed material.<br>
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You may wish to review the
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<b><a href="../../license.html"
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target="_blank"
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rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
|
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of <b>CC BY-SA 4.0</b>.<br>
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</p>
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</div>
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|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
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<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F1998%2Ftomtorfs%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
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<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
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