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Landon Curt Noll a1c86c8a7a add original C links to entry navigation bars
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<h1>The International Obfuscated C Code Contest</h1>
<h2>2011/akari - Best of Show - Most Shrinkable</h2>
<h3>Downsampler with 3 embedded programs</h3>
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<a class="Left" href="../../2006/toledo3/index.html">&larr; 2006/toledo3</a>
<a class="Left" href="../index.html">&uarr; 2011 &uarr;</a>
<a class="Left" href="../blakely/index.html">2011/blakely &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2011/akari/akari.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Don_Yang">Don Yang</a><br>
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>
<pre><code> make</code></pre>
<h2 id="to-use">To use:</h2>
<pre><code> ./akari [ input_file | - ] [ output_file | - ] [even]</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p><code>Akari</code> is an image downsampling utility that accepts 3 input formats:</p>
<ul>
<li><p><a href="https://netpbm.sourceforge.net/doc/pgm.html">PGM</a>
(<a href="https://netpbm.sourceforge.net/doc/">netpbm</a> <a href="https://en.wikipedia.org/wiki/Grayscale">greyscale
image</a>. <code>Akari</code> only accepts <code>PGM</code>
files with the header: <code>P5 &lt;width&gt; &lt;height&gt; 255</code>. Images with extra comments
<em>such as the ones produced by <a href="https://www.gimp.org">GIMP</a> will <strong>not be parsed
properly</strong></em>.</p></li>
<li><p><a href="https://netpbm.sourceforge.net/doc/ppm.html">PPM</a> (netpbm RGB image). Only
<code>PPM</code> files with the header <code>P6 &lt;width&gt; &lt;height&gt; 255</code> are accepted.</p></li>
<li><p><a href="https://en.wikipedia.org/wiki/ASCII_art">ASCII art</a> (with <a href="https://en.wikipedia.org/wiki/Newline">end of
lines</a> in LF bytes only, <em><strong>not</strong> CR-LF</em>!)</p></li>
</ul>
<p>Anything that is not parsable as <code>PGM</code> or <code>PPM</code> will be downsampled as ASCII art.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p><code>Akari</code> is an image downsampling utility. She accepts up to 3 arguments:</p>
<p>The first argument is the input image. If it’s <code>-</code> or unspecified, <code>Akari</code>
will read from <code>stdin</code>.</p>
<p>The second argument is the output image. If it’s <code>-</code> or unspecified,
<code>Akari</code> will write to <code>stdout</code>.</p>
<p>The third argument, if specified, causes <code>Akari</code> to keep even pixels on even
<a href="https://en.wikipedia.org/wiki/Scan_line">scanlines</a>. By default <code>Akari</code> will
keep odd pixels on odd <a href="https://en.wikipedia.org/wiki/Scan_line">scanlines</a>.</p>
<h3 id="examples">Examples:</h3>
<pre><code> gcc akari.c -o akari
./akari &lt; example.ppm &gt; odd_output.ppm
./akari - - even &lt; example.ppm &gt; even_output.ppm
./akari example.ppm odd_output.ppm</code></pre>
<p><code>Akari</code> accepts 3 input formats:</p>
<ul>
<li><a href="https://netpbm.sourceforge.net/doc/pgm.html">PGM</a>
(<a href="https://netpbm.sourceforge.net/doc/">netpbm</a> <a href="https://en.wikipedia.org/wiki/Grayscale">greyscale
image</a>. <code>Akari</code> only accepts <code>PGM</code>
files with the header: <code>P5 &lt;width&gt; &lt;height&gt; 255</code>. Images with extra comments
such as the ones produced by <a href="https://www.gimp.org">GIMP</a> will not be parsed
properly.
<a href="https://netpbm.sourceforge.net/doc/ppm.html">PPM</a> (netpbm RGB image). Only
<code>PPM</code> files with the header <code>P6 &lt;width&gt; &lt;height&gt; 255</code> are accepted.</li>
<li>ASCII art (with end of lines in LF bytes only, not CR-LF)</li>
</ul>
<p>This is useful for decoding some curiously interlaced images, such as
the included <a href="example.ppm">example.ppm</a>.</p>
<p>Anything that is not parsable as <code>PGM</code> or <code>PPM</code> will be downsampled as
ASCII art. Since the source code is formatted as ASCII art, it’s only
natural to try:</p>
<pre><code> ./akari akari.c akari2.c</code></pre>
<p><code>akari2.c</code> is also a valid C program, and accepts up to 1 argument.
By default, this second program reads text from <code>stdin</code> and writes
expanded output to <code>stdout</code>. If the extra argument is specified, the
output text will also pass through a rot13 filter.</p>
<pre><code> gcc akari2.c -o akari2
./akari2 &lt; input.txt &gt; expanded_output.txt
./akari2 rot13 &lt; input.txt &gt; expanded_and_rot13_output.txt</code></pre>
<p>You can combine the two programs together to have just a regular rot13
filter:</p>
<pre><code> ./akari2 rot13 &lt; input.txt | ./akari &gt; rot13.txt</code></pre>
<p>Of course, we wouldn’t stop with just 2 programs, you can downsample
the source <em>again</em> and get yet another C program:</p>
<pre><code> ./akari &lt; akari.c | ./akari &gt; akari3.c</code></pre>
<p>We must go deeper:</p>
<pre><code> ./akari &lt; akari.c | ./akari | ./akari &gt; akari4.c</code></pre>
<p><code>akari3.c</code> and <code>akari4.c</code> are still (mostly valid) C programs.
<code>gcc -Wall</code> will output a few warnings, but still produce output
executables. The output executables each print a message to <code>stdout</code>.</p>
<p>It takes quite a bit of skill and obfuscation to interleave a
C program 4 levels deep, it’s much easier to interleave something like
a <code>brainf#$%</code> program in a C program, for example. For comparison, a
<code>brainf#$%</code> program is embedded inside <a href="https://github.com/ioccc-src/winner/blob/master/2011/akari/akari.c">akari.c</a>.</p>
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<h1 id="inventory-for-2011akari">Inventory for 2011/akari</h1>
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<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/akari/akari.c">akari.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/akari/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/akari/akari.orig.c">akari.orig.c</a> - original source code</li>
<li><a href="example.ppm">example.ppm</a> - example input ppm file</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/akari/try.sh">try.sh</a> - script to try entry</li>
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