The navigation bar for a winning entry now has a "_Original C_" link
(between the ✅ and the Inventory on the right hand side) so that one
may easily view the original C code that was submitted for IOCCC judging.
Ran `make www timestamp` to perform the above.
758 lines
28 KiB
HTML
758 lines
28 KiB
HTML
<!DOCTYPE html>
|
||
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
|
||
<!-- START: two lines up starts content from: inc/top.default.html -->
|
||
|
||
<!-- END: this line ends content from: inc/top.default.html -->
|
||
<!-- START: this line starts content from: inc/head.default.html -->
|
||
|
||
<head>
|
||
<link rel="stylesheet" href="../../ioccc.css">
|
||
<link href="https://fonts.googleapis.com/css2?family=Outfit:wght@100..900&display=swap" rel="stylesheet">
|
||
<meta charset="utf-8">
|
||
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
|
||
<title>1990/jaw - Best entropy-reducer</title>
|
||
<link rel="icon" type="image/x-icon" href="../../favicon.ico">
|
||
<meta name="description" content="1990 IOCCC entry jaw - Best entropy-reducer">
|
||
<meta name="keywords" content="IOCCC, 1990, IOCCC 1990, IOCCC entry, jaw, Best entropy-reducer">
|
||
</head>
|
||
|
||
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
|
||
<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
|
||
<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
|
||
<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
|
||
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
|
||
|
||
<!-- END: this line ends content from: inc/head.default.html -->
|
||
|
||
<!-- -->
|
||
<!-- This web page was formed via the tool: bin/readme2index.sh -->
|
||
<!-- The content of main section of this web page came from: 1990/jaw/README.md -->
|
||
<!-- -->
|
||
|
||
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
|
||
<!-- !!! Do not modify this web page, instead modify the file: 1990/jaw/README.md !!! -->
|
||
<!-- !!! Do not modify this web page, instead modify the file: 1990/jaw/README.md !!! -->
|
||
<!-- !!! Do not modify this web page, instead modify the file: 1990/jaw/README.md !!! -->
|
||
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
|
||
|
||
<!-- Markdown content was converted into HTML via the tool: bin/md2html.sh -->
|
||
|
||
<!-- START: this line starts content from: inc/body.default.html -->
|
||
|
||
<body>
|
||
|
||
<!-- END: this line ends content from: inc/body.default.html -->
|
||
<!-- START: this line starts content from: inc/topbar.default.html -->
|
||
|
||
<div class="theader">
|
||
<nav class="topbar">
|
||
<div class="container">
|
||
<div class="logo">
|
||
<a href="../../index.html" class="logo-link">
|
||
IOCCC
|
||
</a>
|
||
</div>
|
||
|
||
<div class="topbar-items">
|
||
<div class="item">
|
||
<span class="item-header">
|
||
Entries
|
||
</span>
|
||
|
||
<div class="sub-item">
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../years.html" class="sub-item-link">
|
||
Winning entries
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../authors.html" class="sub-item-link">
|
||
Winning authors
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../location.html" class="sub-item-link">
|
||
Location of authors
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../bugs.html" class="sub-item-link">
|
||
Bugs and (mis)features
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../faq.html#fix_an_entry" class="sub-item-link">
|
||
Fixing entries
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../faq.html#fix_author" class="sub-item-link">
|
||
Updating author info
|
||
</a>
|
||
</div>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<div class="item">
|
||
<span class="item-header">
|
||
Status
|
||
</span>
|
||
|
||
<div class="sub-item">
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../news.html" class="sub-item-link">
|
||
News
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../status.html" class="sub-item-link">
|
||
Contest status
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../next/rules.html" class="sub-item-link">
|
||
IOCCC rules
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../next/guidelines.html" class="sub-item-link">
|
||
IOCCC guidelines
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../markdown.html" class="sub-item-link">
|
||
Markdown guidelines
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../SECURITY.html" class="sub-item-link">
|
||
Security policy
|
||
</a>
|
||
</div>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<div class="item">
|
||
<span class="item-header">
|
||
FAQ
|
||
</span>
|
||
|
||
<div class="sub-item">
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../faq.html" class="sub-item-link">
|
||
Frequently asked questions
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../quick-start.html#enter" class="sub-item-link">
|
||
Enter the IOCCC
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../faq.html#compiling" class="sub-item-link">
|
||
Compiling entries
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../faq.html#running_entries" class="sub-item-link">
|
||
Running entries
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../faq.html#help" class="sub-item-link">
|
||
How to help
|
||
</a>
|
||
</div>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<div class="item">
|
||
<span class="item-header">
|
||
About
|
||
</span>
|
||
|
||
<div class="sub-item">
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../index.html" class="sub-item-link">
|
||
Home page
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../social.html" class="sub-item-link">
|
||
IOCCC social media
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../about.html" class="sub-item-link">
|
||
About the IOCCC
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../judges.html" class="sub-item-link">
|
||
The judges
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../thanks-for-help.html" class="sub-item-link">
|
||
Thanks for the help
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../contact.html" class="sub-item-link">
|
||
Contact us
|
||
</a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</nav>
|
||
|
||
<div class="header-mobile-menu">
|
||
<noscript>
|
||
<a href="../../nojs-menu.html" class="topbar-js-label">
|
||
Please Enable JavaScript
|
||
</a>
|
||
</noscript>
|
||
|
||
<button id="header-open-menu-button" class="topbar-mobile-menu">
|
||
<img
|
||
src="../../png/hamburger-icon-open.png"
|
||
alt="hamburger style menu icon - open state"
|
||
width=48
|
||
height=48>
|
||
</button>
|
||
|
||
<button id="header-close-menu-button" class="hide-content">
|
||
<img
|
||
src="../../png/hamburger-icon-closed.png"
|
||
alt="hamburger style menu icon - closed state"
|
||
width=48
|
||
height=48>
|
||
</button>
|
||
|
||
<div id="mobile-menu-panel" class="hide-content">
|
||
<div class="mobile-menu-container">
|
||
|
||
<div class="mobile-menu-wrapper">
|
||
<div class="mobile-menu-item">
|
||
Entries
|
||
</div>
|
||
<div class="mobile-submenu-wrapper">
|
||
|
||
<a class="mobile-submenu-item" href="../../years.html">
|
||
Winning entries
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../authors.html">
|
||
Winning authors
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../location.html">
|
||
Location of authors
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../bugs.html">
|
||
Bugs and (mis)features
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../faq.html#fix_an_entry">
|
||
Fixing entries
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../faq.html#fix_author">
|
||
Updating author info
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../thanks-for-help.html">
|
||
Thanks for the help
|
||
</a>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<div class="mobile-menu-wrapper">
|
||
|
||
<div class="mobile-menu-item">
|
||
Status
|
||
</div>
|
||
<div class="mobile-submenu-wrapper">
|
||
|
||
<a class="mobile-submenu-item" href="../../news.html">
|
||
News
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../status.html">
|
||
Contest status
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../next/rules.html">
|
||
IOCCC rules
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../next/guidelines.html">
|
||
IOCCC guidelines
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../markdown.html">
|
||
Markdown guidelines
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../SECURITY.html">
|
||
Security policy
|
||
</a>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<div class="mobile-menu-wrapper">
|
||
<div class="mobile-menu-item">
|
||
FAQ
|
||
</div>
|
||
<div class="mobile-submenu-wrapper">
|
||
|
||
<a class="mobile-submenu-item" href="../../faq.html">
|
||
Frequently asked questions
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../quick-start.html#enter">
|
||
Enter the IOCCC
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../faq.html#compiling">
|
||
Compiling entries
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../faq.html#running_entries">
|
||
Running entries
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../faq.html#help">
|
||
How to help
|
||
</a>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<div class="mobile-menu-wrapper">
|
||
<div class="mobile-menu-item">
|
||
About
|
||
</div>
|
||
<div class="mobile-submenu-wrapper">
|
||
|
||
<a class="mobile-submenu-item" href="../../index.html">
|
||
Home page
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../social.html">
|
||
IOCCC social media
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../about.html">
|
||
About the IOCCC
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../judges.html">
|
||
The judges
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../contact.html">
|
||
Contact us
|
||
</a>
|
||
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
</div>
|
||
|
||
<script>
|
||
var headerOpenMenuButton = document.getElementById("header-open-menu-button");
|
||
var headerCloseMenuButton = document.getElementById("header-close-menu-button");
|
||
var mobileMenuPanel = document.getElementById("mobile-menu-panel");
|
||
|
||
headerOpenMenuButton.addEventListener("click", () => {
|
||
headerOpenMenuButton.classList.remove("topbar-mobile-menu");
|
||
headerOpenMenuButton.classList.add("hide-content");
|
||
|
||
headerCloseMenuButton.classList.remove("hide-content");
|
||
headerCloseMenuButton.classList.add("topbar-mobile-menu");
|
||
|
||
mobileMenuPanel.classList.remove("hide-content");
|
||
mobileMenuPanel.classList.add("topbar-mobile-panel");
|
||
});
|
||
|
||
headerCloseMenuButton.addEventListener("click", () => {
|
||
headerCloseMenuButton.classList.remove("topbar-mobile-menu");
|
||
headerCloseMenuButton.classList.add("hide-content");
|
||
|
||
mobileMenuPanel.classList.add("hide-content");
|
||
mobileMenuPanel.classList.remove("topbar-mobile-panel");
|
||
|
||
headerOpenMenuButton.classList.add("topbar-mobile-menu");
|
||
headerOpenMenuButton.classList.remove("hide-content");
|
||
});
|
||
</script>
|
||
|
||
<!-- END: this line ends content from: inc/topbar.default.html -->
|
||
<!-- START: this line starts content from: inc/header.default.html -->
|
||
|
||
<div class="header">
|
||
<a href="../../2011/zucker/index.html">
|
||
<img src="../../png/ioccc.png"
|
||
alt="IOCCC image by Matt Zucker"
|
||
width=300
|
||
height=110>
|
||
</a>
|
||
<h1>The International Obfuscated C Code Contest</h1>
|
||
<h2>1990/jaw - Best entropy-reducer</h2>
|
||
<h3>compress and atob standins</h3>
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/header.default.html -->
|
||
<!-- START: this line starts content from: inc/navbar.mid.html -->
|
||
|
||
<div class="navbar">
|
||
<a class="Left" href="../dg/index.html">← 1990/dg</a>
|
||
<a class="Left" href="../index.html">↑ 1990 ↑</a>
|
||
<a class="Left" href="../pjr/index.html">1990/pjr →</a>
|
||
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1990/jaw/jaw.c">C code</a>
|
||
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1990/jaw/Makefile">Makefile</a>
|
||
<a class="Right" href="#inventory">Inventory</a>
|
||
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1990/jaw/jaw.orig.c">Original C</a>
|
||
<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F1990%2Fjaw%2Findex.html">✓</a>
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/navbar.mid.html -->
|
||
<!-- START: this line starts content from: inc/before-content.default.html -->
|
||
|
||
<div class="content" id="content">
|
||
|
||
<!-- END: this line ends content from: inc/before-content.default.html -->
|
||
<!-- START: this line starts content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
|
||
|
||
<!-- START: this line starts content generated by: bin/output-index-author.sh -->
|
||
|
||
<div id="author">
|
||
<h2 id="authors">Authors:</h2>
|
||
</div>
|
||
<ul>
|
||
<li>Name: <a href="../../authors.html#James_A_Woods">James A. Woods</a><br>
|
||
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)
|
||
<br><br></li>
|
||
<li>Name: <a href="../../authors.html#Karl_F_Fox">Karl F. Fox</a><br>
|
||
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)
|
||
<br><br></li>
|
||
<li>Name: <a href="../../authors.html#Paul_Eggert">Paul Eggert</a><br>
|
||
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
|
||
</ul>
|
||
|
||
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
|
||
|
||
<!-- END: this line ends content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
|
||
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
|
||
|
||
<!-- BEFORE: 1st line of markdown file: 1990/jaw/README.md -->
|
||
<h2 id="to-build">To build:</h2>
|
||
<pre><code> make all</code></pre>
|
||
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
|
||
<p>The current status of this entry is:</p>
|
||
<blockquote>
|
||
<p><strong>STATUS: known bug - please help us fix</strong></p>
|
||
</blockquote>
|
||
<p>For more detailed information see <a href="../../bugs.html#1990_jaw">1990/jaw in bugs.html</a>.</p>
|
||
<h2 id="try">Try:</h2>
|
||
<p>To test the official C entry, one might try:</p>
|
||
<pre><code> echo "Quartz glyph jocks vend, fix, BMW." | compress | ./btoa | ./jaw</code></pre>
|
||
<p>which should apply the identity transformation to a minimal holoalphabetic
|
||
sentence.</p>
|
||
<h4 id="also-try">Also try:</h4>
|
||
<pre><code> ./try.sh</code></pre>
|
||
<h2 id="judges-remarks">Judges’ remarks:</h2>
|
||
<p>The program, in its base form, implements two useful utilities:</p>
|
||
<ul>
|
||
<li><code>atob</code> - ASCII to binary conversion</li>
|
||
<li><code>zcat</code> - decompression filter</li>
|
||
</ul>
|
||
<p>Included with this entry is a shell script (with comments edited down to reduce
|
||
it to 1530 bytes) which implements the complete shark utility. The script,
|
||
<a href="https://github.com/ioccc-src/winner/blob/master/1990/jaw/shark.sh">shark.sh</a>, contains a <code>jaw.c</code> embedded within it!</p>
|
||
<p>The sender must have <code>compress</code> and <code>btoa</code>. To send, try:</p>
|
||
<pre><code> ./shark.sh jaw.* README.md > receive</code></pre>
|
||
<p>The resulting file, <code>receive</code>, unpacks the input files
|
||
even if the receiver lacks <code>uncompress</code> and <code>btoa</code>:</p>
|
||
<pre><code> mkdir -p test
|
||
cd test
|
||
sh ../receive
|
||
cmp ../jaw.c jaw.c
|
||
cmp ../README.md README.md</code></pre>
|
||
<p><strong>NOTE</strong>: a limitation is that the script should be in the parent directory of the
|
||
directory it is run from.</p>
|
||
<h2 id="authors-remarks">Authors’ remarks:</h2>
|
||
<h3 id="abstract">ABSTRACT</h3>
|
||
<h4 id="minimal-universal-file-bundling-or-functional-obfuscation-in-a-self-decoding-unix-shell-archive">Minimal, Universal File Bundling (or, Functional Obfuscation in a Self-Decoding Unix Shell Archive)</h4>
|
||
<blockquote>
|
||
<p>“Use an algorithm, go to jail.”</p>
|
||
<p>– anon., circa 1988</p>
|
||
</blockquote>
|
||
<p><strong>HISTORICAL NOTE</strong>: We started working on this just before the
|
||
<a href="https://en.wikipedia.org/wiki/Morris_worm">Morris worm</a> era.</p>
|
||
<p>Myriad formats have been proposed for network-mailable data. A major difficulty
|
||
undermining the popularity of most file/message bundlers is that the sender
|
||
assumes prior installation of the computational dual of such bundling software
|
||
by the receiver. Command shell archives alleviate this problem somewhat, but
|
||
still require standardization for the function of data compression and
|
||
mail-transparency encoding. On Unix, these coding format quandaries are overcome
|
||
by planting a novel <a href="https://en.wikipedia.org/wiki/Trojan_horse_(computing)">Trojan
|
||
Horse</a> in the archive
|
||
header to perform negotiation-less decoding.</p>
|
||
<p>Specifically, we outline the development of an extraordinarily compact portable
|
||
bundler/extractor to (dis)assemble data-compressed, binary-to-ASCII-converted,
|
||
length-split, and checksummed directory structures using standard Unix tools.
|
||
Miniature versions of counterparts to a Lempel-Ziv coder (<code>compress</code> or
|
||
<code>squeeze</code>) and an efficient bit packetizer (<code>btoa</code>) are compiled on-the-fly at
|
||
mail destination sites where they may not already exist. These are written in
|
||
purposefully obfuscated-C to accompany similarly-shrunk shell command glue. This
|
||
resulting shell archiver is dubbed <code>shark</code>.</p>
|
||
<p><code>shark</code> procedure overhead consumes as few as three dozen shell commands (or
|
||
<code>~1100</code> bytes), commensurate with the size of many Internet mail headers; it
|
||
amortizes favorably with message size. <code>shark</code> is portable across Unix
|
||
variants, while the underlying technique is inherently generalizable to other
|
||
encoding schemes.</p>
|
||
<p>In the function-theoretic sense of minimal Chaitin/Kolmogorov complexity, and
|
||
within a modified Shannon model of communication, the ‘shark’ effort aims to
|
||
construct a “shortest program” for source decoding in the Turing-universal Unix
|
||
environment.</p>
|
||
<blockquote>
|
||
<p>Oh, the shark has pretty teeth, dear–<br>
|
||
And he shows them pearly white<br>
|
||
Just a jackknife has Macheath, dear–<br>
|
||
And he keeps it out of sight.<br></p>
|
||
<p>– Bertolt Brecht, Threepenny Opera</p>
|
||
</blockquote>
|
||
<h3 id="portability">Portability</h3>
|
||
<p>We have ported this program to a wide variety of systems. Among
|
||
these are:</p>
|
||
<ul>
|
||
<li>SunOS 4.1 / Sun SPARCstation 1 (using both ‘cc’ and ‘gcc 1.37.1’)</li>
|
||
<li>SunOS 4.0.3 / Sun 3</li>
|
||
<li>BSD 4.3 / VAX 8650</li>
|
||
<li>SEIUX / Sumitomo Electric Ustation/S</li>
|
||
<li>Sony NEWS-OS 3.3 / Sony NEWS (fairly vanilla 4.3BSD)</li>
|
||
<li>System V.? / Hitachi 2050</li>
|
||
<li>System V.? / NEC EWS 4800</li>
|
||
<li>UNIOS-B / Omron Luna</li>
|
||
<li>Dynix / Sequent Balance (‘cc’ for Natl. Semi. base + ‘gcc 1.36’)</li>
|
||
<li>Unicos / Cray 2</li>
|
||
</ul>
|
||
<h3 id="obfuscation">Obfuscation</h3>
|
||
<p>We (the authors) feel this program is obfuscated for the
|
||
following reasons:</p>
|
||
<ol start="0" type="1">
|
||
<li><p>This is one of the few programs you’ll see <em>WHOSE VERY UTILITY DEPENDS ON ITS
|
||
OBFUSCATION</em>!</p></li>
|
||
<li><p>The contest entry may be used to send its wonderful self to anyone in the
|
||
Unix world! Virus writers need not apply…</p></li>
|
||
<li><p>The basic idea is twisted enough to be patentable, but is, out of the
|
||
kindness of our hearts (as well as to maintain eligibility for the large IOCCC
|
||
prize fund), dedicated to the public domain. Claude Shannon, meet Alan Turing.</p></li>
|
||
<li><p>Meta-obfuscation is via obfuscated description (see <em>ABSTRACT</em>).</p></li>
|
||
<li><p>“Literary” allusion. Production code contains a reference to self-reference,
|
||
preserved at amazing cost for sheer perversity.</p></li>
|
||
<li><p>Many, many micro obfuscations below, honed over three years time, in shell as
|
||
well as C. Ask about the ‘tar’ pit escape, the <code>argv[0]</code> flip, Paul’s
|
||
<code>&4294967295</code> portability hack, the “void where prohibited by flaw” fix, the
|
||
<code>scanf()</code> space-saver, shift shenanigans, signal madness, <code>exit()</code>ing stage
|
||
left, and source-to-source transformations galore.</p></li>
|
||
</ol>
|
||
<h3 id="for-extra-credit">For extra credit:</h3>
|
||
<p>Construct <code>sharkmail</code>, to auto-split <code>sharkives</code> into mailable segments and mail
|
||
them. Here’s a simple one, which could be extended to enable auto-reassembly
|
||
with one shell cmd at the far end.</p>
|
||
<pre><code> #!/bin/sh
|
||
m=$1; shift
|
||
shark $* | split -800 - /tmp/shark$$
|
||
n=`ls /tmp/shark$$* | wc -l | sed 's/ *//'`
|
||
p=0
|
||
for f in `ls /tmp/shark$$*`
|
||
do
|
||
p=`expr $p + 1`
|
||
mail -s "bundle ($p of $n) from '`whoami`'" $m < $f
|
||
done
|
||
rm /tmp/shark$$*</code></pre>
|
||
<h3 id="shark-history">Shark history:</h3>
|
||
<ul>
|
||
<li><p>May 1987: Karl Fox introduces 1023-byte <code>zcat.c</code> to USENET.
|
||
It’s too late for the 4th IOCCC.</p></li>
|
||
<li><p>May 21, 1987: James A. Woods extends idea to construct self
|
||
decompressing <code>shar</code> Trojan horse, utilizing <code>cc</code>, <code>shar</code>,
|
||
<code>zcat</code>, & <code>btoa</code>; size: 2303 bytes.</p></li>
|
||
<li><p>May 23, 1987: <code>jaw</code> trims 250 bytes without much thought.</p></li>
|
||
<li><p>June 2, 1987: 52 lines of shell, 1991 bytes, now made with <code>tar</code>,
|
||
short-circuit C-compile at far end, dual-use main.c,
|
||
portability mods. (jaw)</p></li>
|
||
<li><p>Mar-May 1988: abortive run at 5th IOCCC.
|
||
<code>jaw.c</code> - 1529 bytes. compile line: 152 bytes.
|
||
generated funny code with <code>execvp()</code> to invoke shell.</p></li>
|
||
<li><p>Aug 29, 1988: production version, now at 1830 bytes.</p></li>
|
||
<li><p>Jan 1990: Paul Eggert does tour-de-force shark re-engineering.</p></li>
|
||
<li><p>May 24, 1990: collaboration yields 999-byte <code>jaw.c</code> core (see above)
|
||
and 1530-byte production shell code (w/comments).
|
||
Eggert comes through with lion’s share of improvements.
|
||
7th IOCCC code now faster than the <code>btoa</code>/<code>zcat</code> it replaces.</p></li>
|
||
<li><p>May 1990: <code>jaw</code> develops experimental replacement using
|
||
Dan Bernstein’s high-compression ‘squeeze’.</p></li>
|
||
</ul>
|
||
<p>To which we add:</p>
|
||
<ul>
|
||
<li>June 1990: <code>shark</code> wins the IOCCC, finally! :-)</li>
|
||
</ul>
|
||
<!--
|
||
|
||
Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
<!-- AFTER: last line of markdown file: 1990/jaw/README.md -->
|
||
|
||
<!-- END: this line ends content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
|
||
<!-- START: this line starts content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->
|
||
|
||
<!-- START: this line starts content generated by: bin/output-index-inventory.sh -->
|
||
|
||
<div id="inventory">
|
||
<h1 id="inventory-for-1990jaw">Inventory for 1990/jaw</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1990/jaw/jaw.c">jaw.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1990/jaw/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1990/jaw/jaw.orig.c">jaw.orig.c</a> - original source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1990/jaw/try.sh">try.sh</a> - script to try entry</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1990/jaw/btoa">btoa</a> - binary to ASCII utility</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1990/jaw/shark.sh">shark.sh</a> - shark utility with embedded source</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="1990_jaw.tar.bz2">1990_jaw.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1990/jaw/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1990/jaw/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1990/jaw/.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/1990/jaw/.path">.path</a> - directory path from top level directory</li>
|
||
<li><a href="index.html">index.html</a> - this web page</li>
|
||
</ul>
|
||
<hr style="width:10%;text-align:left;margin-left:0">
|
||
<h4>
|
||
Jump to: <a href="#">top</a>
|
||
</h4>
|
||
|
||
<!-- END: next line ends content generated by: bin/output-index-inventory.sh -->
|
||
|
||
<!-- END: this line ends content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->
|
||
<!-- START: this line starts content from: inc/after-content.default.html -->
|
||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/after-content.default.html -->
|
||
<!-- START: this line starts content from: inc/footer.inventory.html -->
|
||
|
||
<!--
|
||
|
||
Copyright © 1984-2025 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
|
||
<div class="footer">
|
||
|
||
<div id="copyright"><h3>Copyright © 1984-2025 by Landon Curt Noll:
|
||
<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
|
||
<p>
|
||
This work is <b>licensed by Landon Curt Noll</b> under
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
|
||
target="_blank"
|
||
rel="license noopener noreferrer"
|
||
style="display:inline-block;">CC BY-SA 4.0</a></b>.
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/cc.png"
|
||
alt="cc inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/by.png"
|
||
alt="person inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/sa.png"
|
||
alt="arrow looping back on itself inside circle symbol"><br>
|
||
You should <b>carefully review</b> the
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
|
||
before using the licensed material.<br>
|
||
You may wish to review the
|
||
<b><a href="../../license.html"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
|
||
of <b>CC BY-SA 4.0</b>.<br>
|
||
</p>
|
||
</div>
|
||
|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
||
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F1990%2Fjaw%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
|
||
<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
|
||
</p>
|
||
</div>
|
||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/footer.inventory.html -->
|
||
<!-- START: this line starts content from: inc/bottom.default.html -->
|
||
|
||
</body>
|
||
</html>
|
||
|
||
<!-- END: this line ends content from: inc/bottom.default.html -->
|