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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta name="GENERATOR" content="mkd2html 2.1.3 DL=DISCOUNT">
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8">
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<link rel="stylesheet"
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type="text/css"
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href="../hint.css">
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<title>Best of Show - Most Shrinkable</title>
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</head>
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<body>
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<h1>Best of Show - Most Shrinkable</h1>
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<p>Don Yang<br>
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<a href="mailto:omoikane@uguu.org">omoikane@uguu.org</a><br>
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<a href="http://uguu.org/">http://uguu.org/</a></p>
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<h2>Judges' comments:</h2>
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<h3>To build:</h3>
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<pre><code>make akari
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</code></pre>
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<h3>To run:</h3>
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<pre><code>./akari [input_file_or_- [output_file_or_- [even]]]
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</code></pre>
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<h3>Try:</h3>
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<pre><code>./akari < example.ppm > odd_output.ppm
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./akari - - even < example.ppm > even_output.ppm
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./akari example.ppm odd_output.ppm
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make akari2.c
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cat akari2.c
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make akari2
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./akari2 < akari2.c
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./akari2 rot13 < akari2.c
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make akari3.c
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cat akari3.c
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make akari3
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./akari3
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make akari4.c
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cat akari4.c
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./akari4
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</code></pre>
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<h3>Selected Judges Remarks:</h3>
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<p>Akari is an image downsampling utility that accepts 3 inout formats:</p>
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<pre><code>* PGM (netpbm grayscale image). Akari only accept PGM files with this
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header: P5 <width> <height> 255. Images with extra comments such as
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the ones produced by GIMP will not be parsed properly.
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* PPM (netpbm RGB image). Only PPM files with this header are
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accepted: P6 <width> <height> 255.
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* ASCII art (with end of lines in LF bytes only, not CR-LF)
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</code></pre>
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<p>Anything that is not parseable as PGM or PPM will be downsampled as ASCII art.</p>
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<h2>Author’s comments:</h2>
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<p>Akari is an image downsampling utility. She accepts up to 3 arguments:</p>
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<p>First argument is the input image. If it’s “-” or unspecified, Akari
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will read from stdin.</p>
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<p>Second argument is the output image. If it’s “-” or unspecified,
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Akari will write to stdout.</p>
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<p>Third argument, if specified, causes Akari to keep even pixels on even
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scanlines. By default Akari will keep odd pixels on odd scanlines.</p>
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<p>Examples:</p>
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<pre><code>gcc akari.c -o akari
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./akari < example.ppm > odd_output.ppm
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./akari - - even < example.ppm > even_output.ppm
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./akari example.ppm odd_output.ppm
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</code></pre>
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<p>Akari accepts 3 input formats:
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* PGM (netpbm grayscale image). Akari only accept PGM files with this
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header: P5 <width> <height> 255. Images with extra comments such as
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the ones produced by GIMP will not be parsed properly.
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* PPM (netpbm RGB image). Only PPM files with this header are
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accepted: P6 <width> <height> 255.
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* ASCII art (with end of lines in LF bytes only, not CR-LF)</p>
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<p>This is useful for decoding some curiously interlaced images, such as
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the included example.ppm</p>
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<p>Anything that is not parseable as PGM or PPM will be downsampled as
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ASCII art. Since the source code is formatted as ASCII art, it’s only
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natural to try:</p>
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<pre><code>./akari akari.c akari2.c
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</code></pre>
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<p>akari2.c is also a valid C program, and accepts up to 1 argument.
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By default, this second program reads text from stdin and writes
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expanded output to stdout. If the extra argument is specified, the
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output text will also pass through a rot13 filter.</p>
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<pre><code>gcc akari2.c -o akari2
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./akari2 < input.txt > expanded_output.txt
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./akari2 rot13 < input.txt > expanded_and_rot13_output.txt
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</code></pre>
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<p>You can combine the two programs together to have just a regular rot13
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filter:</p>
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<pre><code>./akari2 rot13 < input.txt | ./akari > rot13.txt
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</code></pre>
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<p>Of course, we wouldn’t stop with just 2 programs, you can downsample
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the source <em>again</em> and get yet another C program:</p>
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<pre><code>./akari < akari.c | ./akari > akari3.c
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</code></pre>
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<p>We must go deeper:</p>
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<pre><code>./akari < akari.c | ./akari | ./akari > akari4.c
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</code></pre>
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<p>akari3.c and akari4.c are still (mostly valid) C programs.
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“gcc -Wall” will output a few warnings, but still produce output
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executables. The output executables each print a message to stdout.</p>
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<p>It takes quite a bit of skill and obfuscation to interleave a
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C program 4 levels deep, it’s much easier to interleave something like
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a brainf#$% program in a C program, for example. For comparison, a
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brainf#$% program is embedded inside akari.c</p>
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<hr />
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<TABLE><TR>
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<TD><a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-sa/3.0/88x31.png" /></a></TD>
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<TD><P>© Copyright 1984-2012,
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<A HREF="/judges.html">Leo Broukhis, Simon Cooper, Landon Curt Noll</A>
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- All rights reserved<BR>
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This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/">Creative Commons Attribution-ShareAlike 3.0 Unported License</a>.</P></TD>
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<TD> <!--<a href="http://validator.w3.org/check?uri=referer"><img src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional" height="31" width="88"></a>--></TD>
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</TR></TABLE>
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</body>
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</html>
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