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ioccc/2012/hamano/index.html
T
Cody Boone Ferguson 009e1b7522 Link in SECURITY.html to all web pages
The location of the link is in the About menu under the 'Contacting the
IOCCC' and above 'Thanks for the help'. At first I had it at the very
bottom, under 'IOCCC markdown guidelines', but it seemed better to have
it closer to contacting the IOCCC. This is the same location in the no
JavaScript menu (which, for those who do not know or forget, is not a
requirement except for some screen sizes).

The top level Makefile has a new 'security' rule. Updated make help.

Typo fixes in make help.

SECURITY.html has had a few updates as well: change the wording of entry
code is unsupported (it now says 'ALL CODE IN ALL IOCCC ENTRIES IS
UNSUPPORTED!!') and it now links to the mkiocccentry repo and how to
report a possible security vulnerability in that repo; as that IS
supported - and since there was reference to discussing security
concerns is in SECURITY.html - even though the entries will not receive
security updates - it seemed a good idea to have a link to report such
security issues in the mkiocccentry repo. Perhaps the FAQ needs to be
updated for this too.
2024-07-15 08:55:54 -07:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>2012/hamano - Silver Award - Most elementary use of C</h2>
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<a class="Left" href="../grothe/index.html">&larr; grothe</a>
<a class="Left" href="../index.html">&uarr; 2012 &uarr;</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/hamano/hamano.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Tsukasa_Hamano">Tsukasa Hamano</a><br>
Location: <a href="../../location.html#JP">JP</a> - <em>Japan</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> ./hamano &lt; textfile &gt; output.pdf</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<p>The script will generate a number of PDF files and it will suggest you look at
them as well. You can read <code>hint.pdf</code> with a PDF reader like <code>acroread hint.pdf</code>
or <code>evince hint.pdf</code>. With macOS you can do <code>open hint.pdf</code> which by default
will open <code>Preview.app</code>. You may of course use your pdf viewer to open the file
directly instead.</p>
<p>One of the PDF files generated the README.md file as a PDF, obfuscated, and
the PDF file will then be compiled as C (itself!) and executed so that it shows
README.md!</p>
<p>That procedure looks like:</p>
<pre><code> ./hamano &lt; README.md &gt; hint.pdf
cc -xc hint.pdf -o hint
./hint</code></pre>
<p>Another PDF generated is an obfuscated <code>Hello World!</code> program (obfuscated inside
the PDF). Once this is done it will compile the PDF as if it was C (itself!). It
will look like:</p>
<pre><code> echo &#39;int main(){puts(&quot;Hello World!&quot;);}&#39; | ./hamano &gt; hello.pdf
cc -xc hello.pdf -o hello
./hello | cc -Wno-implicit-function-declaration -xc - -o ./hello2
./hello2</code></pre>
<p>although the <code>CFLAGS</code> will be what is in the Makefile as it uses the helper
rules <code>hint.pdf</code>, <code>hint</code>, <code>hello.pdf</code> and <code>hello</code> to do this.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>This entry treads into a new territory for IOCCC - generating PDF files.</p>
<p>The originally submitted entry could have been thought of as a “Best abuse of
Ghostscript” entry. :-)</p>
<p>The source code and rendered pages are obfuscated for humans (where
is the font?), and the submitted entry created PDF files that left Ghostscript
confused.</p>
<p>The results can be viewed with Acrobat Reader,
<a href="http://en.wikipedia.org/wiki/Evince">evince</a> and Apple’s
<a href="https://en.wikipedia.org/wiki/Preview_(macOS)">Preview</a>.</p>
<p>The updated version can also be viewed using Ghostscript.</p>
<p>There is something strange about the little flags in the output.
A search of English literature will provide a hint. The conclusion
you might draw is too elementary. :-)</p>
<p>So what do those flags really mean?</p>
<p>The <a href="http://en.wikipedia.org/wiki/The_Adventure_of_the_Dancing_Men">Dancing men
algorithm</a> might
be useful.</p>
<p>Don’t forget to take a look at the generated PDF. Perhaps you might even want
to compile the output with a C compiler. When you run it, what does it
output?</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>This program obfuscate text file into PDF file with <a href="http://en.wikipedia.org/wiki/The_Adventure_of_the_Dancing_Men">Dancing men
algorithm</a>.</p>
<p>Probably, the output PDF file is compliant with PDF 1.3 and it’s also
available to compile as C code.</p>
<p>I’ve tested it with GCC 4.7 and Clang 3.0 with Linux, and the following
PDF Readers:</p>
<ul>
<li>Adobe Acrobat Reader</li>
<li>Evince</li>
<li>Ghostscript</li>
<li>Xpdf</li>
</ul>
<h3 id="obfuscations">Obfuscations</h3>
<p>This program is obfuscated by using classical methods. But can you find the
embedded font in the fragmented glyph?</p>
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<h1 id="inventory-for-2012hamano">Inventory for 2012/hamano</h1>
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<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/hamano/hamano.c">hamano.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/hamano/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/hamano/try.sh">try.sh</a> - script to try entry</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2012_hamano.tar.bz2">2012_hamano.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/hamano/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/hamano/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/hamano/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/hamano/.path">.path</a> - directory path from top level directory</li>
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