Landon Curt Noll
ccc360b2fb
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width=300
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</a>
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>obfuscation.html for 2015/burton</h2>
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</div>
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<div class="navbar">
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<a class="Left" href="index.html">↑ jump to 2015/burton/index.html ↑</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%2F2015%2Fburton%2Fobfuscation.html">✓</a>
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<!-- BEFORE: 1st line of markdown file: 2015/burton/obfuscation.md -->
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<h3 id="deobfuscation">Deobfuscation</h3>
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<p><code>calc</code> is a recursive-descent parser. It allocates from the stack deep enough
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that all expressions are exhausted before the recursion stack depth reaches the
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allocations. The memory map and source is documented in
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<a href="src.doc.txt">src.doc.txt</a>. Tokens are encoded using values 0-20, where 0 is an
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invalid token, 1 is minus, 2 is space, 3 is plus, etc. The necessary constants
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are derived at the start of the program, using the guarantee that globals are
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initialized to zero; so a correct NULL pointer is obtained from an uninitialized
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global pointer variable, and the integers from uninitialized global <code>int</code>
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variables. If <code>x</code> is a global <code>int</code>, then <code>!x</code> is <code>1</code>, and the derivation
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proceeds from there, using some identities that are confusingly similar and
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interestingly combined (increasing obfuscation):</p>
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<pre><code> obc clr
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--- ---
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-~x x+1
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~-x x-1
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y-~x y+x+1</code></pre>
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<p>The derived constants are a compromise between simple expressions, maximum utility,
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and minimum number of variables used.</p>
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<p>Command line arguments are copied into the upper half of the input buffer,
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separated by a space. This allows the code to have a single input parser by using
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a pointer-to-func to either <code>getchar(3)</code> if live, or a <code>getchar(3)</code> simulator.</p>
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<p>A small amount of obfuscation comes from <code>void</code> functions declared <code>int</code>, but
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missing <code>return</code>. This is necessary to allow these functions in ternary <code>?:</code>
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expressions and paired with <code>&&</code> and <code>||</code>; but the requisite returns would add
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symbol count at no benefit to obscurity or functionality. Function
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decomposition was mostly chosen to avoid curly braces: if a <code>for</code>-loop required
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multiple statements, the body became a new function. Last, but not least:
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sharing state via global variables is an ancient and honored form of
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obfuscation, and remarkably effective.</p>
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<hr style="width:10%;text-align:left;margin-left:0">
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<p>Jump to: <a href="#">top</a></p>
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<!--
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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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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https://creativecommons.org/licenses/by-sa/4.0/
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<!--
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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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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https://creativecommons.org/licenses/by-sa/4.0/
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<div id="copyright"><h3>Copyright © 1984-2024 by Landon Curt Noll:
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<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
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target="_blank"
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rel="license noopener noreferrer">Some Rights Reserved</a></h3>
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<p>
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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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rel="license noopener noreferrer"
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style="display:inline-block;">CC BY-SA 4.0</a></b>.
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You should <b>carefully review</b> the
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before using the licensed material.<br>
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You may wish to review the
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</div>
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<div id="coda"><h3>Coda</h3>
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<p>
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<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2015%2Fburton%2Fobfuscation.html" rel="nofollow">Nu HTML check this web page</a><br>
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