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<h1>The International Obfuscated C Code Contest</h1>
<h2>2018/algmyr - Most cacophonic</h2>
<h3>Converts text to sound using font as spectrogram</h3>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2018/algmyr/prog.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Anton_Algmyr">Anton Älgmyr</a><br>
Location: <a href="../../location.html#SE">SE</a> - <em>Kingdom of Sweden</em> (<em>Sweden</em>)</li>
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<h2 id="to-build">To build:</h2>
<pre><code> make</code></pre>
<p>To use this entry requires, in some invocations, a sound processing program.
This can be ALSA or SoX but we recommend the latter. See the
FAQ on “<a href="../../faq.html#sox">SDL1 and SDL2</a>”.</p>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<blockquote>
<p><strong>STATUS: INABIAF - please DO NOT fix</strong></p>
</blockquote>
<p>For more detailed information see <a href="../../bugs.html#2018_algmyr">2018/algmyr in bugs.html</a>.</p>
<h2 id="to-use">To use:</h2>
<pre><code> ./prog < prog.c # Print garbage: might mess up your terminal
./prog <file1> <file2> > out.raw
./prog -d 2 0 out.raw # Decode the first (0th) channel out of two</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>Be warned, this is not your garden variety text-to-speech program! Earplugs are advised,
or at least a handy and well-tested volume knob.</p>
<p>Pixels are numbered, amplitudes are weighed, frequencies are divided,
and the message can be displayed in fiery letters, but don’t be alarmed.</p>
<p>How does decoding of the waveform work? Can you encode an arbitrary text in a
sound sample?</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<h3 id="what-is-this">What is this?</h3>
<p>To put it brief, this entry is akin to a sound based cat. It takes characters as
input and outputs them into frequency space as audio. The entry also supports
decoding the produced waveforms using the <code>-d</code> flag. Usage instructions is
output if run with the <code>-h</code> flag, albeit not in an immediately legible format.</p>
<h3 id="details">Details</h3>
<p>In normal operation, the entry reads characters from one or more sources. If the
<code>-h</code> flag is given, usage instructions is used as a source. Else if file paths
are present as arguments those will be used. Else <code>stdin</code> is used.</p>
<p>If a character is part of the supported subset of ASCII <code>{10, 32-126}</code> then that
character is output into frequency space of an audio signal (44.1 kHz single
precision float, endianness should depend on system endianness) through <code>stdout</code>.
Any other character will be interpreted and outputted as a space.</p>
<p>Characters are printed using a (slightly modified) pixel font based on
<a href="https://github.com/hchargois/gohufont">gohufont</a>.
Pixels are drawn using crosses in frequency space, achieved by simultaneous up
and down chirps.</p>
<p>Each input source is designated its own channel in the output (one float per
channel per time step in the output) so if you have a surround sound system you
could listen to a cacophony of chirpy characters.</p>
<p>Interestingly, with training you might actually be able to tell characters just
from hearing. But even without training you can easily read along with the
printed characters and have the sound make sense with the look of the
characters.</p>
<p>See image <a href="spectrogram.png">spectrogram.png</a> for an example spectrogram:</p>
<p><img src="spectrogram.png"
alt="example spectrogram"
width=748 height=400></p>
<h3 id="limitations">Limitations</h3>
<p>There is no error checking done when opening files, so expect segfaults if you
provide the wrong path to a file.</p>
<p>This program is bound to misbehave if <code>int</code> is less than 32 bits.</p>
<p>Flags will only be interpreted correctly if they are the first argument. Reading
a file named <code>-d</code> or <code>-h</code> is fully possible if it is not the first file
provided, even though I am not sure why you would want to do that.</p>
<p>Providing invalid/unexpected arguments to the decode flag will result in odd
behavior. Some erroneous arguments cause segfaults (negative number of channels,
channel id outside valid range). One argument in particular causes an infinite
loop printing whitespace.</p>
<h3 id="obfuscation">Obfuscation:</h3>
<p>A lot of the obfuscations done came naturally from trying to appease the size
tool. To name some:</p>
<ul>
<li>One character names.</li>
<li>Merging of related (and not so related) arithmetic operations.</li>
<li>Short circuiting for flow control to replace some <code>if</code>s.</li>
<li>Some <code>#defines</code>, sadly.</li>
</ul>
<p>On the intersection of size and obfuscation is the data encoding, which was
quite fun to design.</p>
<p>Some additional obfuscation was done to mathematical formulas. Somewhat known
expressions were transformed into equivalent but less recognizable counterparts.</p>
<p>I have tried to avoid intentional red herrings in the code, although fishy
statements are plentiful.</p>
<h3 id="data-encoding">Data encoding:</h3>
<p>The large string in the beginning of the source file contains font data, encoded
in base64 using characters in the range <code>' '</code> to <code>'_'</code>. The space was chosen as
zero because the data contains a lot of zeroes, and quite helpfully the size
tool ignores whitespace even in strings. Without this fact the program would
have been too large and the decoding feature would have had to go. Fortunately
this hole in the size spec was readily available. :)</p>
<p>Characters in the font (5x8 pixels, 40 bits) are packed into 7 base64 digits
(which was a pain to decode in minimal code).</p>
<h3 id="math">Math:</h3>
<p>Note that even though <code>float</code>s are used for the waveforms, the standard math
library is not used at all! Most arithmetic is done purely on integers. The only
major exception is generating a table of sine values which are interpolated to
give high resolution waveforms. Can you see when the generation is triggered,
and how it is done?</p>
<p>A critical issue encountered was that having abrupt starts and ends of signals
cause a lot of problems with spectral leakage which makes spectrograms hard to
read and audio painful to listen to. To reduce spectral leakage a windowing
function was used. Although the one used is quite well known, it is not in a
form that should be familiar to anyone. What looks like a polynomial and quacks
like a polynomial might not actually be a polynomial, at least not deep inside.</p>
<h3 id="printing-a-string">Printing a string:</h3>
<p>The program was written to deal exclusively with file descriptors, so how would
one go about printing a <code>char</code> array not from a file descriptor without adding
additional logic? Answer: <code>ungetc(3)</code> into <code>stdin</code>, one <code>char</code> at a time (to be
standards compliant). This is used to print the usage instructions.</p>
<h3 id="compilation-warnings">Compilation warnings</h3>
<p>Compiling using</p>
<pre><code> gcc -Wall -Wextra -pedantic</code></pre>
<p>gives only <code>-Wmisleading-indentation</code> which is sensible considering the source code. While</p>
<pre><code> clang -Wall -Wextra -pedantic</code></pre>
<p>is a bit more pessimistic and gives <code>-Wempty-body</code> (I like loops without
bodies), <code>-Wstring-plus-int</code> (since apparently some people think string+<code>int</code> is a
concatenation) and one of the weirder warnings I have seen from me splitting a
negative constant with whitespace. Compiling using</p>
<pre><code> clang -Wall -Wextra -pedantic -Weverything</code></pre>
<p>produces a few page faults of warnings and makes me feel generally bad about
myself. :(</p>
<h3 id="misc">Misc</h3>
<p>The reported size of the source code using the size tool is very intentionally
2018.</p>
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<h1 id="inventory-for-2018algmyr">Inventory for 2018/algmyr</h1>
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<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2018/algmyr/prog.c">prog.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2018/algmyr/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2018/algmyr/prog.orig.c">prog.orig.c</a> - original source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2018/algmyr/try.sh">try.sh</a> - script to try entry</li>
<li><a href="spectrogram.png">spectrogram.png</a> - example spectrogram image</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2018_algmyr.tar.bz2">2018_algmyr.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2018/algmyr/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2018/algmyr/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2018/algmyr/.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/2018/algmyr/.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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<div id="coda"><h3>Coda</h3>
<p>
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2018%2Falgmyr%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
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