472 lines
109 KiB
HTML
472 lines
109 KiB
HTML
<!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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<title>Binary Files</title>
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<link href="../docs-assets/Breadcrumbs.css" rel="stylesheet" rev="stylesheet" type="text/css">
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<meta name="viewport" content="width=device-width initial-scale=1">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta http-equiv="Content-Language" content="en-gb">
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<link href="../docs-assets/Contents.css" rel="stylesheet" rev="stylesheet" type="text/css">
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<link href="../docs-assets/Progress.css" rel="stylesheet" rev="stylesheet" type="text/css">
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<link href="../docs-assets/Navigation.css" rel="stylesheet" rev="stylesheet" type="text/css">
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<link href="../docs-assets/Fonts.css" rel="stylesheet" rev="stylesheet" type="text/css">
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<link href="../docs-assets/Base.css" rel="stylesheet" rev="stylesheet" type="text/css">
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<script>
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function togglePopup(material_id) {
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var popup = document.getElementById(material_id);
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popup.classList.toggle("show");
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}
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</script>
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<link href="../docs-assets/Popups.css" rel="stylesheet" rev="stylesheet" type="text/css">
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<script>
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MathJax = {
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tex: {
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inlineMath: '$', '$'], ['\\(', '\\)'
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},
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svg: {
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fontCache: 'global'
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}
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};
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</script>
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<script type="text/javascript" id="MathJax-script" async
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src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-svg.js">
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</script>
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<link href="../docs-assets/Colours.css" rel="stylesheet" rev="stylesheet" type="text/css">
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</head>
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<body class="commentary-font">
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<nav role="navigation">
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<h1><a href="../index.html">
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<img src="../docs-assets/Octagram.png" width=72 height=72">
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</a></h1>
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<ul><li><a href="../inweb/index.html">inweb</a></li>
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</ul><h2>Foundation Module</h2><ul>
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<li><a href="index.html"><span class="selectedlink">foundation</span></a></li>
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<li><a href="../foundation-test/index.html">foundation-test</a></li>
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</ul><h2>Example Webs</h2><ul>
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<li><a href="../goldbach/index.html">goldbach</a></li>
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<li><a href="../twinprimes/twinprimes.html">twinprimes</a></li>
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<li><a href="../eastertide/index.html">eastertide</a></li>
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</ul><h2>Repository</h2><ul>
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<li><a href="https://github.com/ganelson/inweb"><img src="../docs-assets/github.png" height=18> github</a></li>
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</ul><h2>Related Projects</h2><ul>
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<li><a href="../../../inform/docs/index.html">inform</a></li>
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<li><a href="../../../intest/docs/index.html">intest</a></li>
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</ul>
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</nav>
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<main role="main">
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<!--Weave of 'Binary Files' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="index.html">foundation</a></li><li><a href="index.html#6">Chapter 6: Media</a></li><li><b>Binary Files</b></li></ul></div>
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<p class="purpose">Routines for reading raw data from binary files.</p>
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<ul class="toc"><li><a href="6-bf.html#SP1">§1. Reading binary data</a></li><li><a href="6-bf.html#SP7">§7. Size</a></li><li><a href="6-bf.html#SP8">§8. Opening</a></li><li><a href="6-bf.html#SP9">§9. Copying</a></li><li><a href="6-bf.html#SP10">§10. MD5 hash computation</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Reading binary data. </b>To begin with, integers of 8, 16, 32 and 64 bit widths respectively,
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arranged with most significant byte (MSB) first.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::read_int8</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">BinaryFiles::read_int8</span></span>:<br/><a href="6-bf.html#SP10">§10</a><br/>Sound Durations - <a href="6-sd.html#SP2">§2</a>, <a href="6-sd.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">, </span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">c1</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::read_int16</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">BinaryFiles::read_int16</span></span>:<br/>Image Dimensions - <a href="6-id.html#SP1">§1</a><br/>Sound Durations - <a href="6-sd.html#SP1">§1</a>, <a href="6-sd.html#SP2">§2</a>, <a href="6-sd.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">, </span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c1</span><span class="plain-syntax">, </span><span class="identifier-syntax">c2</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax"> || </span><span class="identifier-syntax">c2</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax"> = (((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">c1</span><span class="plain-syntax">) << </span><span class="constant-syntax">8</span><span class="plain-syntax">) + ((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">c2</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::read_int32</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">BinaryFiles::read_int32</span></span>:<br/><a href="6-bf.html#SP5">§5</a><br/>Image Dimensions - <a href="6-id.html#SP2">§2</a><br/>Sound Durations - <a href="6-sd.html#SP1">§1</a>, <a href="6-sd.html#SP2">§2</a>, <a href="6-sd.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">, </span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c1</span><span class="plain-syntax">, </span><span class="identifier-syntax">c2</span><span class="plain-syntax">, </span><span class="identifier-syntax">c3</span><span class="plain-syntax">, </span><span class="identifier-syntax">c4</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c3</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c4</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax"> || </span><span class="identifier-syntax">c2</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax"> || </span><span class="identifier-syntax">c3</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax"> || </span><span class="identifier-syntax">c4</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax"> = (((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">c1</span><span class="plain-syntax">) << </span><span class="constant-syntax">24</span><span class="plain-syntax">) +</span>
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<span class="plain-syntax"> (((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">c2</span><span class="plain-syntax">) << </span><span class="constant-syntax">16</span><span class="plain-syntax">) +</span>
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<span class="plain-syntax"> (((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">c3</span><span class="plain-syntax">) << </span><span class="constant-syntax">8</span><span class="plain-syntax">) + ((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">c4</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::read_int64</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">BinaryFiles::read_int64</span></span>:<br/>Sound Durations - <a href="6-sd.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">, </span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c1</span><span class="plain-syntax">, </span><span class="identifier-syntax">c2</span><span class="plain-syntax">, </span><span class="identifier-syntax">c3</span><span class="plain-syntax">, </span><span class="identifier-syntax">c4</span><span class="plain-syntax">, </span><span class="identifier-syntax">c5</span><span class="plain-syntax">, </span><span class="identifier-syntax">c6</span><span class="plain-syntax">, </span><span class="identifier-syntax">c7</span><span class="plain-syntax">, </span><span class="identifier-syntax">c8</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c3</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c4</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c5</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c6</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c7</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c8</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax"> || </span><span class="identifier-syntax">c2</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax"> || </span><span class="identifier-syntax">c3</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax"> || </span><span class="identifier-syntax">c4</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax"> || </span><span class="identifier-syntax">c5</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span>
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<span class="plain-syntax"> || </span><span class="identifier-syntax">c6</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax"> || </span><span class="identifier-syntax">c7</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax"> || </span><span class="identifier-syntax">c8</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax"> = (((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax">) </span><span class="identifier-syntax">c1</span><span class="plain-syntax">) << </span><span class="constant-syntax">56</span><span class="plain-syntax">) +</span>
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<span class="plain-syntax"> (((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax">) </span><span class="identifier-syntax">c2</span><span class="plain-syntax">) << </span><span class="constant-syntax">48</span><span class="plain-syntax">) +</span>
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<span class="plain-syntax"> (((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax">) </span><span class="identifier-syntax">c3</span><span class="plain-syntax">) << </span><span class="constant-syntax">40</span><span class="plain-syntax">) +</span>
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<span class="plain-syntax"> (((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax">) </span><span class="identifier-syntax">c4</span><span class="plain-syntax">) << </span><span class="constant-syntax">32</span><span class="plain-syntax">) +</span>
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<span class="plain-syntax"> (((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax">) </span><span class="identifier-syntax">c5</span><span class="plain-syntax">) << </span><span class="constant-syntax">24</span><span class="plain-syntax">) +</span>
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<span class="plain-syntax"> (((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax">) </span><span class="identifier-syntax">c6</span><span class="plain-syntax">) << </span><span class="constant-syntax">16</span><span class="plain-syntax">) +</span>
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<span class="plain-syntax"> (((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax">) </span><span class="identifier-syntax">c7</span><span class="plain-syntax">) << </span><span class="constant-syntax">8</span><span class="plain-syntax">) +</span>
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<span class="plain-syntax"> ((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax">) </span><span class="identifier-syntax">c8</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::write_int32</span><span class="plain-syntax">(</span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">, </span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">val</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c1</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) ((</span><span class="identifier-syntax">val</span><span class="plain-syntax"> >> </span><span class="constant-syntax">24</span><span class="plain-syntax">) & </span><span class="constant-syntax">0xFF</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c2</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) ((</span><span class="identifier-syntax">val</span><span class="plain-syntax"> >> </span><span class="constant-syntax">16</span><span class="plain-syntax">) & </span><span class="constant-syntax">0xFF</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c3</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) ((</span><span class="identifier-syntax">val</span><span class="plain-syntax"> >> </span><span class="constant-syntax">8</span><span class="plain-syntax">) & </span><span class="constant-syntax">0xFF</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c4</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) (</span><span class="identifier-syntax">val</span><span class="plain-syntax"> & </span><span class="constant-syntax">0xFF</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">putc</span><span class="plain-syntax">(</span><span class="identifier-syntax">c1</span><span class="plain-syntax">, </span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">) == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">putc</span><span class="plain-syntax">(</span><span class="identifier-syntax">c2</span><span class="plain-syntax">, </span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">) == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">putc</span><span class="plain-syntax">(</span><span class="identifier-syntax">c3</span><span class="plain-syntax">, </span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">) == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">putc</span><span class="plain-syntax">(</span><span class="identifier-syntax">c4</span><span class="plain-syntax">, </span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">) == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>We will sometimes need to toggle between MSB and LSB representation of
|
|
integers 32 or 64 bits wide:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::swap_bytes32</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">BinaryFiles::swap_bytes32</span></span>:<br/>Sound Durations - <a href="6-sd.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">result</span><span class="plain-syntax"> = (((*</span><span class="identifier-syntax">value</span><span class="plain-syntax"> & </span><span class="constant-syntax">0xff</span><span class="plain-syntax">) << </span><span class="constant-syntax">24</span><span class="plain-syntax">) +</span>
|
|
<span class="plain-syntax"> ((*</span><span class="identifier-syntax">value</span><span class="plain-syntax"> & </span><span class="constant-syntax">0xff00</span><span class="plain-syntax">) << </span><span class="constant-syntax">8</span><span class="plain-syntax">) +</span>
|
|
<span class="plain-syntax"> ((*</span><span class="identifier-syntax">value</span><span class="plain-syntax"> & </span><span class="constant-syntax">0xff0000</span><span class="plain-syntax">) >> </span><span class="constant-syntax">8</span><span class="plain-syntax">) +</span>
|
|
<span class="plain-syntax"> ((*</span><span class="identifier-syntax">value</span><span class="plain-syntax"> & </span><span class="constant-syntax">0xff000000</span><span class="plain-syntax">) >> </span><span class="constant-syntax">24</span><span class="plain-syntax"> ) );</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax"> = </span><span class="identifier-syntax">result</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::swap_bytes64</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">BinaryFiles::swap_bytes64</span></span>:<br/>Sound Durations - <a href="6-sd.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> </span><span class="identifier-syntax">result</span><span class="plain-syntax"> = (((*</span><span class="identifier-syntax">value</span><span class="plain-syntax"> & </span><span class="constant-syntax">0xff</span><span class="plain-syntax">) << </span><span class="constant-syntax">56</span><span class="plain-syntax">) +</span>
|
|
<span class="plain-syntax"> ((*</span><span class="identifier-syntax">value</span><span class="plain-syntax"> & </span><span class="constant-syntax">0xff00</span><span class="plain-syntax">) << </span><span class="constant-syntax">40</span><span class="plain-syntax">) +</span>
|
|
<span class="plain-syntax"> ((*</span><span class="identifier-syntax">value</span><span class="plain-syntax"> & </span><span class="constant-syntax">0xff0000</span><span class="plain-syntax">) << </span><span class="constant-syntax">24</span><span class="plain-syntax">) +</span>
|
|
<span class="plain-syntax"> ((*</span><span class="identifier-syntax">value</span><span class="plain-syntax"> & </span><span class="constant-syntax">0xff000000</span><span class="plain-syntax">) << </span><span class="constant-syntax">8</span><span class="plain-syntax">) +</span>
|
|
<span class="plain-syntax"> ((*</span><span class="identifier-syntax">value</span><span class="plain-syntax"> >> </span><span class="constant-syntax">8</span><span class="plain-syntax">) & </span><span class="constant-syntax">0xff000000</span><span class="plain-syntax">) +</span>
|
|
<span class="plain-syntax"> ((*</span><span class="identifier-syntax">value</span><span class="plain-syntax"> >> </span><span class="constant-syntax">24</span><span class="plain-syntax">) & </span><span class="constant-syntax">0xff0000</span><span class="plain-syntax">) +</span>
|
|
<span class="plain-syntax"> ((*</span><span class="identifier-syntax">value</span><span class="plain-syntax"> >> </span><span class="constant-syntax">40</span><span class="plain-syntax">) & </span><span class="constant-syntax">0xff00</span><span class="plain-syntax">) +</span>
|
|
<span class="plain-syntax"> ((*</span><span class="identifier-syntax">value</span><span class="plain-syntax"> >> </span><span class="constant-syntax">56</span><span class="plain-syntax">) & </span><span class="constant-syntax">0xff</span><span class="plain-syntax">) );</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax"> = </span><span class="identifier-syntax">result</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>Some file formats also have variable-sized integers, as a sequence of
|
|
bytes (most significant first) in which each byte consists of seven bits
|
|
of data plus a most significant bit which marks that a continuation byte
|
|
follows:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::read_variable_length_integer</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">BinaryFiles::read_variable_length_integer</span></span>:<br/>Sound Durations - <a href="6-sd.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">, </span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">do</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax"> = (*</span><span class="identifier-syntax">result</span><span class="plain-syntax"> << </span><span class="constant-syntax">7</span><span class="plain-syntax">) + (((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax">) </span><span class="identifier-syntax">c</span><span class="plain-syntax">) & </span><span class="constant-syntax">0x7F</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (((</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax">) </span><span class="identifier-syntax">c</span><span class="plain-syntax">) & </span><span class="constant-syntax">0x80</span><span class="plain-syntax">);</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>Here we read just the mantissa of a particular representation of
|
|
floating-point numbers:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::read_float80</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">BinaryFiles::read_float80</span></span>:<br/>Sound Durations - <a href="6-sd.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">, </span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c1</span><span class="plain-syntax">, </span><span class="identifier-syntax">c2</span><span class="plain-syntax">, </span><span class="identifier-syntax">exp</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">prev</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">mantissa</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">c1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">c2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">getc</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax"> || </span><span class="identifier-syntax">c2</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (!</span><a href="6-bf.html#SP1" class="function-link"><span class="function-syntax">BinaryFiles::read_int32</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">, &</span><span class="identifier-syntax">mantissa</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">exp</span><span class="plain-syntax"> = </span><span class="constant-syntax">30</span><span class="plain-syntax"> - </span><span class="identifier-syntax">c2</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">exp</span><span class="plain-syntax">--) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">prev</span><span class="plain-syntax"> = </span><span class="identifier-syntax">mantissa</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">mantissa</span><span class="plain-syntax"> >>= </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">prev</span><span class="plain-syntax"> & </span><span class="constant-syntax">1</span><span class="plain-syntax">) </span><span class="identifier-syntax">mantissa</span><span class="plain-syntax">++;</span>
|
|
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">result</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">mantissa</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>And lastly we read a string of a supplied length from the file, and
|
|
then null terminate it to make it valid C string. (<span class="extract"><span class="extract-syntax">string</span></span> must therefore
|
|
be at least <span class="extract"><span class="extract-syntax">length</span></span> plus 1 bytes long.)
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::read_string</span><button class="popup" onclick="togglePopup('usagePopup9')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup9">Usage of <span class="code-font"><span class="function-syntax">BinaryFiles::read_string</span></span>:<br/>Sound Durations - <a href="6-sd.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">string</span><span class="plain-syntax">, </span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">length</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">length</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">fread</span><span class="plain-syntax">(</span><span class="identifier-syntax">string</span><span class="plain-syntax">, </span><span class="constant-syntax">1</span><span class="plain-syntax">, </span><span class="identifier-syntax">length</span><span class="plain-syntax">, </span><span class="identifier-syntax">binary_file</span><span class="plain-syntax">) != </span><span class="identifier-syntax">length</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">string</span><span class="plain-syntax">[</span><span class="identifier-syntax">length</span><span class="plain-syntax">] = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. Size. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">long</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::size</span><span class="plain-syntax">(</span><span class="reserved-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">TEST_FILE</span><span class="plain-syntax"> = </span><a href="6-bf.html#SP8" class="function-link"><span class="function-syntax">BinaryFiles::try_to_open_for_reading</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">TEST_FILE</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">fseek</span><span class="plain-syntax">(</span><span class="identifier-syntax">TEST_FILE</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">SEEK_END</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">long</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">file_size</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ftell</span><span class="plain-syntax">(</span><span class="identifier-syntax">TEST_FILE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">file_size</span><span class="plain-syntax"> == -1</span><span class="identifier-syntax">L</span><span class="plain-syntax">) </span><a href="3-em.html#SP2" class="function-link"><span class="function-syntax">Errors::fatal_with_file</span></a><span class="plain-syntax">(</span><span class="string-syntax">"ftell failed on linked file"</span><span class="plain-syntax">, </span><span class="identifier-syntax">F</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="6-bf.html#SP8" class="function-link"><span class="function-syntax">BinaryFiles::close</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">TEST_FILE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">file_size</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><a href="3-em.html#SP2" class="function-link"><span class="function-syntax">Errors::fatal_with_file</span></a><span class="plain-syntax">(</span><span class="string-syntax">"fseek failed on linked file"</span><span class="plain-syntax">, </span><span class="identifier-syntax">F</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="6-bf.html#SP8" class="function-link"><span class="function-syntax">BinaryFiles::close</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">TEST_FILE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -1</span><span class="identifier-syntax">L</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. Opening. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="function-syntax">BinaryFiles::open_for_reading</span><button class="popup" onclick="togglePopup('usagePopup10')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup10">Usage of <span class="code-font"><span class="function-syntax">BinaryFiles::open_for_reading</span></span>:<br/><a href="6-bf.html#SP10">§10</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">handle</span><span class="plain-syntax"> = </span><a href="3-fln.html#SP10" class="function-link"><span class="function-syntax">Filenames::fopen</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="string-syntax">"rb"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">handle</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><a href="3-em.html#SP2" class="function-link"><span class="function-syntax">Errors::fatal_with_file</span></a><span class="plain-syntax">(</span><span class="string-syntax">"unable to read file"</span><span class="plain-syntax">, </span><span class="identifier-syntax">F</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">handle</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="function-syntax">BinaryFiles::try_to_open_for_reading</span><button class="popup" onclick="togglePopup('usagePopup11')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup11">Usage of <span class="code-font"><span class="function-syntax">BinaryFiles::try_to_open_for_reading</span></span>:<br/><a href="6-bf.html#SP7">§7</a>, <a href="6-bf.html#SP9">§9</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="3-fln.html#SP10" class="function-link"><span class="function-syntax">Filenames::fopen</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="string-syntax">"rb"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="function-syntax">BinaryFiles::open_for_writing</span><span class="plain-syntax">(</span><span class="reserved-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">handle</span><span class="plain-syntax"> = </span><a href="3-fln.html#SP10" class="function-link"><span class="function-syntax">Filenames::fopen</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="string-syntax">"wb"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">handle</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><a href="3-em.html#SP2" class="function-link"><span class="function-syntax">Errors::fatal_with_file</span></a><span class="plain-syntax">(</span><span class="string-syntax">"unable to write file"</span><span class="plain-syntax">, </span><span class="identifier-syntax">F</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">handle</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="function-syntax">BinaryFiles::try_to_open_for_writing</span><button class="popup" onclick="togglePopup('usagePopup12')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup12">Usage of <span class="code-font"><span class="function-syntax">BinaryFiles::try_to_open_for_writing</span></span>:<br/><a href="6-bf.html#SP9">§9</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="3-fln.html#SP10" class="function-link"><span class="function-syntax">Filenames::fopen</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="string-syntax">"wb"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::close</span><button class="popup" onclick="togglePopup('usagePopup13')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup13">Usage of <span class="code-font"><span class="function-syntax">BinaryFiles::close</span></span>:<br/><a href="6-bf.html#SP7">§7</a>, <a href="6-bf.html#SP9">§9</a>, <a href="6-bf.html#SP10">§10</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">handle</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">fclose</span><span class="plain-syntax">(</span><span class="identifier-syntax">handle</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>§9. Copying. </b>This achieves a binary copy of a file when we haven't got access to the shell,
|
|
or to system APIs.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::copy</span><span class="plain-syntax">(</span><span class="reserved-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="reserved-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">to</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">suppress_error</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">from</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">to</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><a href="3-em.html#SP2" class="function-link"><span class="function-syntax">Errors::fatal</span></a><span class="plain-syntax">(</span><span class="string-syntax">"files confused in copier"</span><span class="plain-syntax">);</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">FROM</span><span class="plain-syntax"> = </span><a href="6-bf.html#SP8" class="function-link"><span class="function-syntax">BinaryFiles::try_to_open_for_reading</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">from</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">FROM</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">suppress_error</span><span class="plain-syntax"> == </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">) </span><a href="3-em.html#SP2" class="function-link"><span class="function-syntax">Errors::fatal_with_file</span></a><span class="plain-syntax">(</span><span class="string-syntax">"unable to read file"</span><span class="plain-syntax">, </span><span class="identifier-syntax">from</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -1;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">TO</span><span class="plain-syntax"> = </span><a href="6-bf.html#SP8" class="function-link"><span class="function-syntax">BinaryFiles::try_to_open_for_writing</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">to</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">TO</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">suppress_error</span><span class="plain-syntax"> == </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">) </span><a href="3-em.html#SP2" class="function-link"><span class="function-syntax">Errors::fatal_with_file</span></a><span class="plain-syntax">(</span><span class="string-syntax">"unable to write to file"</span><span class="plain-syntax">, </span><span class="identifier-syntax">to</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -1;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">size</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="constant-syntax">TRUE</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><span class="identifier-syntax">fgetc</span><span class="plain-syntax">(</span><span class="identifier-syntax">FROM</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> == </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">) </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">size</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">putc</span><span class="plain-syntax">(</span><span class="identifier-syntax">c</span><span class="plain-syntax">, </span><span class="identifier-syntax">TO</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
|
|
<span class="plain-syntax"> </span><a href="6-bf.html#SP8" class="function-link"><span class="function-syntax">BinaryFiles::close</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">FROM</span><span class="plain-syntax">); </span><a href="6-bf.html#SP8" class="function-link"><span class="function-syntax">BinaryFiles::close</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">TO</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">size</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP10" class="paragraph-anchor"></a><b>§10. MD5 hash computation. </b>Though now seen as insecure from a cryptographic point of view, Message Digest 5,
|
|
a form of checksum created by Ronald Rivest in 1992, remains very useful as a
|
|
way to compare files quickly, at least when we're sure nobody is being malicious.
|
|
</p>
|
|
|
|
<p class="commentary">There are thousands of amateur implementations, most of them, like this one,
|
|
paraphrased from the pseudocode at the Wikipedia page. The <span class="extract"><span class="extract-syntax">mask</span></span> function allows
|
|
certain fixed byte positions in the file to be considered as if they were zero bytes,
|
|
which is helpful when testing comparing files whose headers change in uninteresting
|
|
ways. If <span class="extract"><span class="extract-syntax">mask</span></span> is <span class="extract"><span class="extract-syntax">NULL</span></span>, or always returns <span class="extract"><span class="extract-syntax">FALSE</span></span>, then the hash computed is
|
|
exactly the canonical md5.
|
|
</p>
|
|
|
|
<p class="commentary">The code below is about as enigmatic as a page of well-meaning code can be, but
|
|
that's down to the algorithm itself. The <span class="extract"><span class="extract-syntax">K</span></span> array hold bits drawn from the sines
|
|
of the integers 1 to 64: sines computed in radians, so that in a sense the md5
|
|
algorithm relies on the irrationality of \(\pi\) to make these so unpredictable.
|
|
At any rate, the magic numbers below are all drawn from RFC 1321.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::md5</span><span class="plain-syntax">(</span><span class="constant-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">mask</span><span class="plain-syntax">)(</span><span class="identifier-syntax">uint64_t</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">s</span><span class="plain-syntax">[64] = {</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">7</span><span class="plain-syntax">, </span><span class="constant-syntax">12</span><span class="plain-syntax">, </span><span class="constant-syntax">17</span><span class="plain-syntax">, </span><span class="constant-syntax">22</span><span class="plain-syntax">, </span><span class="constant-syntax">7</span><span class="plain-syntax">, </span><span class="constant-syntax">12</span><span class="plain-syntax">, </span><span class="constant-syntax">17</span><span class="plain-syntax">, </span><span class="constant-syntax">22</span><span class="plain-syntax">, </span><span class="constant-syntax">7</span><span class="plain-syntax">, </span><span class="constant-syntax">12</span><span class="plain-syntax">, </span><span class="constant-syntax">17</span><span class="plain-syntax">, </span><span class="constant-syntax">22</span><span class="plain-syntax">, </span><span class="constant-syntax">7</span><span class="plain-syntax">, </span><span class="constant-syntax">12</span><span class="plain-syntax">, </span><span class="constant-syntax">17</span><span class="plain-syntax">, </span><span class="constant-syntax">22</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">5</span><span class="plain-syntax">, </span><span class="constant-syntax">9</span><span class="plain-syntax">, </span><span class="constant-syntax">14</span><span class="plain-syntax">, </span><span class="constant-syntax">20</span><span class="plain-syntax">, </span><span class="constant-syntax">5</span><span class="plain-syntax">, </span><span class="constant-syntax">9</span><span class="plain-syntax">, </span><span class="constant-syntax">14</span><span class="plain-syntax">, </span><span class="constant-syntax">20</span><span class="plain-syntax">, </span><span class="constant-syntax">5</span><span class="plain-syntax">, </span><span class="constant-syntax">9</span><span class="plain-syntax">, </span><span class="constant-syntax">14</span><span class="plain-syntax">, </span><span class="constant-syntax">20</span><span class="plain-syntax">, </span><span class="constant-syntax">5</span><span class="plain-syntax">, </span><span class="constant-syntax">9</span><span class="plain-syntax">, </span><span class="constant-syntax">14</span><span class="plain-syntax">, </span><span class="constant-syntax">20</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">4</span><span class="plain-syntax">, </span><span class="constant-syntax">11</span><span class="plain-syntax">, </span><span class="constant-syntax">16</span><span class="plain-syntax">, </span><span class="constant-syntax">23</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">, </span><span class="constant-syntax">11</span><span class="plain-syntax">, </span><span class="constant-syntax">16</span><span class="plain-syntax">, </span><span class="constant-syntax">23</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">, </span><span class="constant-syntax">11</span><span class="plain-syntax">, </span><span class="constant-syntax">16</span><span class="plain-syntax">, </span><span class="constant-syntax">23</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">, </span><span class="constant-syntax">11</span><span class="plain-syntax">, </span><span class="constant-syntax">16</span><span class="plain-syntax">, </span><span class="constant-syntax">23</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">6</span><span class="plain-syntax">, </span><span class="constant-syntax">10</span><span class="plain-syntax">, </span><span class="constant-syntax">15</span><span class="plain-syntax">, </span><span class="constant-syntax">21</span><span class="plain-syntax">, </span><span class="constant-syntax">6</span><span class="plain-syntax">, </span><span class="constant-syntax">10</span><span class="plain-syntax">, </span><span class="constant-syntax">15</span><span class="plain-syntax">, </span><span class="constant-syntax">21</span><span class="plain-syntax">, </span><span class="constant-syntax">6</span><span class="plain-syntax">, </span><span class="constant-syntax">10</span><span class="plain-syntax">, </span><span class="constant-syntax">15</span><span class="plain-syntax">, </span><span class="constant-syntax">21</span><span class="plain-syntax">, </span><span class="constant-syntax">6</span><span class="plain-syntax">, </span><span class="constant-syntax">10</span><span class="plain-syntax">, </span><span class="constant-syntax">15</span><span class="plain-syntax">, </span><span class="constant-syntax">21</span><span class="plain-syntax"> };</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">K</span><span class="plain-syntax">[64] = {</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0xd76aa478</span><span class="plain-syntax">, </span><span class="constant-syntax">0xe8c7b756</span><span class="plain-syntax">, </span><span class="constant-syntax">0x242070db</span><span class="plain-syntax">, </span><span class="constant-syntax">0xc1bdceee</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0xf57c0faf</span><span class="plain-syntax">, </span><span class="constant-syntax">0x4787c62a</span><span class="plain-syntax">, </span><span class="constant-syntax">0xa8304613</span><span class="plain-syntax">, </span><span class="constant-syntax">0xfd469501</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0x698098d8</span><span class="plain-syntax">, </span><span class="constant-syntax">0x8b44f7af</span><span class="plain-syntax">, </span><span class="constant-syntax">0xffff5bb1</span><span class="plain-syntax">, </span><span class="constant-syntax">0x895cd7be</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0x6b901122</span><span class="plain-syntax">, </span><span class="constant-syntax">0xfd987193</span><span class="plain-syntax">, </span><span class="constant-syntax">0xa679438e</span><span class="plain-syntax">, </span><span class="constant-syntax">0x49b40821</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0xf61e2562</span><span class="plain-syntax">, </span><span class="constant-syntax">0xc040b</span><span class="identifier-syntax">340</span><span class="plain-syntax">, </span><span class="constant-syntax">0x265e5a51</span><span class="plain-syntax">, </span><span class="constant-syntax">0xe9b6c7aa</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0xd62f105d</span><span class="plain-syntax">, </span><span class="constant-syntax">0x02441453</span><span class="plain-syntax">, </span><span class="constant-syntax">0xd8a1e681</span><span class="plain-syntax">, </span><span class="constant-syntax">0xe7d3fbc8</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0x21e1cde6</span><span class="plain-syntax">, </span><span class="constant-syntax">0xc33707d6</span><span class="plain-syntax">, </span><span class="constant-syntax">0xf4d50d87</span><span class="plain-syntax">, </span><span class="constant-syntax">0x455a14ed</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0xa9e3e905</span><span class="plain-syntax">, </span><span class="constant-syntax">0xfcefa3f8</span><span class="plain-syntax">, </span><span class="constant-syntax">0x676f02d9</span><span class="plain-syntax">, </span><span class="constant-syntax">0x8d2a4c8a</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0xfffa3942</span><span class="plain-syntax">, </span><span class="constant-syntax">0x8771f681</span><span class="plain-syntax">, </span><span class="constant-syntax">0x6d9d6122</span><span class="plain-syntax">, </span><span class="constant-syntax">0xfde5380c</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0xa4beea44</span><span class="plain-syntax">, </span><span class="constant-syntax">0x4bdecfa9</span><span class="plain-syntax">, </span><span class="constant-syntax">0xf6bb4b60</span><span class="plain-syntax">, </span><span class="constant-syntax">0xbebfbc70</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0x289b7ec6</span><span class="plain-syntax">, </span><span class="constant-syntax">0xeaa127fa</span><span class="plain-syntax">, </span><span class="constant-syntax">0xd4ef3085</span><span class="plain-syntax">, </span><span class="constant-syntax">0x04881d05</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0xd9d4d039</span><span class="plain-syntax">, </span><span class="constant-syntax">0xe6db99e5</span><span class="plain-syntax">, </span><span class="constant-syntax">0x1fa27cf8</span><span class="plain-syntax">, </span><span class="constant-syntax">0xc4ac5665</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0xf4292244</span><span class="plain-syntax">, </span><span class="constant-syntax">0x432aff97</span><span class="plain-syntax">, </span><span class="constant-syntax">0xab9423a7</span><span class="plain-syntax">, </span><span class="constant-syntax">0xfc93a039</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0x655b59c3</span><span class="plain-syntax">, </span><span class="constant-syntax">0x8f0ccc92</span><span class="plain-syntax">, </span><span class="constant-syntax">0xffeff47d</span><span class="plain-syntax">, </span><span class="constant-syntax">0x85845dd1</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0x6fa87e4f</span><span class="plain-syntax">, </span><span class="constant-syntax">0xfe2ce6e0</span><span class="plain-syntax">, </span><span class="constant-syntax">0xa3014314</span><span class="plain-syntax">, </span><span class="constant-syntax">0x4e0811a1</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0xf7537e82</span><span class="plain-syntax">, </span><span class="constant-syntax">0xbd3af235</span><span class="plain-syntax">, </span><span class="constant-syntax">0x2ad7d2bb</span><span class="plain-syntax">, </span><span class="constant-syntax">0xeb86d391</span><span class="plain-syntax"> };</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">a0</span><span class="plain-syntax"> = </span><span class="constant-syntax">0x67452301</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">b0</span><span class="plain-syntax"> = </span><span class="constant-syntax">0xefcdab89</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">c0</span><span class="plain-syntax"> = </span><span class="constant-syntax">0x98badcfe</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">d0</span><span class="plain-syntax"> = </span><span class="constant-syntax">0x10325476</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">buffer</span><span class="plain-syntax">[64];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">bc</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">FILE</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bin</span><span class="plain-syntax"> = </span><a href="6-bf.html#SP8" class="function-link"><span class="function-syntax">BinaryFiles::open_for_reading</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">bin</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><a href="3-em.html#SP2" class="function-link"><span class="function-syntax">Errors::fatal_with_file</span></a><span class="plain-syntax">(</span><span class="string-syntax">"unable to open binary file"</span><span class="plain-syntax">, </span><span class="identifier-syntax">F</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">unsigned</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">uint64_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">L</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><a href="6-bf.html#SP1" class="function-link"><span class="function-syntax">BinaryFiles::read_int8</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bin</span><span class="plain-syntax">, &</span><span class="identifier-syntax">b</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">mask</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">mask</span><span class="plain-syntax">(</span><span class="identifier-syntax">L</span><span class="plain-syntax">))) </span><span class="identifier-syntax">b</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-bf.html#SP10_1" class="named-paragraph-link"><span class="named-paragraph">Process one byte of message</span><span class="named-paragraph-number">10.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">L</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">uint64_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">original_length</span><span class="plain-syntax"> = </span><span class="identifier-syntax">L</span><span class="plain-syntax">*8;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> = </span><span class="constant-syntax">0x80</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-bf.html#SP10_1" class="named-paragraph-link"><span class="named-paragraph">Process one byte of message</span><span class="named-paragraph-number">10.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">L</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">L</span><span class="plain-syntax"> % </span><span class="constant-syntax">64</span><span class="plain-syntax"> != </span><span class="constant-syntax">56</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-bf.html#SP10_1" class="named-paragraph-link"><span class="named-paragraph">Process one byte of message</span><span class="named-paragraph-number">10.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">L</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">original_length</span><span class="plain-syntax"> & </span><span class="constant-syntax">0x00000000000000FF</span><span class="plain-syntax">) >> </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-bf.html#SP10_1" class="named-paragraph-link"><span class="named-paragraph">Process one byte of message</span><span class="named-paragraph-number">10.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">original_length</span><span class="plain-syntax"> & </span><span class="constant-syntax">0x000000000000FF00</span><span class="plain-syntax">) >> </span><span class="constant-syntax">8</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-bf.html#SP10_1" class="named-paragraph-link"><span class="named-paragraph">Process one byte of message</span><span class="named-paragraph-number">10.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">original_length</span><span class="plain-syntax"> & </span><span class="constant-syntax">0x0000000000FF0000</span><span class="plain-syntax">) >> </span><span class="constant-syntax">16</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-bf.html#SP10_1" class="named-paragraph-link"><span class="named-paragraph">Process one byte of message</span><span class="named-paragraph-number">10.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">original_length</span><span class="plain-syntax"> & </span><span class="constant-syntax">0x00000000FF000000</span><span class="plain-syntax">) >> </span><span class="constant-syntax">24</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-bf.html#SP10_1" class="named-paragraph-link"><span class="named-paragraph">Process one byte of message</span><span class="named-paragraph-number">10.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">original_length</span><span class="plain-syntax"> & </span><span class="constant-syntax">0x000000FF00000000</span><span class="plain-syntax">) >> </span><span class="constant-syntax">32</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-bf.html#SP10_1" class="named-paragraph-link"><span class="named-paragraph">Process one byte of message</span><span class="named-paragraph-number">10.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">original_length</span><span class="plain-syntax"> & </span><span class="constant-syntax">0x0000FF0000000000</span><span class="plain-syntax">) >> </span><span class="constant-syntax">40</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-bf.html#SP10_1" class="named-paragraph-link"><span class="named-paragraph">Process one byte of message</span><span class="named-paragraph-number">10.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">original_length</span><span class="plain-syntax"> & </span><span class="constant-syntax">0x00FF000000000000</span><span class="plain-syntax">) >> </span><span class="constant-syntax">48</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-bf.html#SP10_1" class="named-paragraph-link"><span class="named-paragraph">Process one byte of message</span><span class="named-paragraph-number">10.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">original_length</span><span class="plain-syntax"> & </span><span class="constant-syntax">0xFF00000000000000</span><span class="plain-syntax">) >> </span><span class="constant-syntax">56</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-bf.html#SP10_1" class="named-paragraph-link"><span class="named-paragraph">Process one byte of message</span><span class="named-paragraph-number">10.1</span></a></span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%02x%02x%02x%02x"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">a0</span><span class="plain-syntax"> % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">, (</span><span class="identifier-syntax">a0</span><span class="plain-syntax"> >> </span><span class="constant-syntax">8</span><span class="plain-syntax">) % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">, (</span><span class="identifier-syntax">a0</span><span class="plain-syntax"> >> </span><span class="constant-syntax">16</span><span class="plain-syntax">) % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">, (</span><span class="identifier-syntax">a0</span><span class="plain-syntax"> >> </span><span class="constant-syntax">24</span><span class="plain-syntax">) % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%02x%02x%02x%02x"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">b0</span><span class="plain-syntax"> % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">, (</span><span class="identifier-syntax">b0</span><span class="plain-syntax"> >> </span><span class="constant-syntax">8</span><span class="plain-syntax">) % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">, (</span><span class="identifier-syntax">b0</span><span class="plain-syntax"> >> </span><span class="constant-syntax">16</span><span class="plain-syntax">) % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">, (</span><span class="identifier-syntax">b0</span><span class="plain-syntax"> >> </span><span class="constant-syntax">24</span><span class="plain-syntax">) % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%02x%02x%02x%02x"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">c0</span><span class="plain-syntax"> % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">, (</span><span class="identifier-syntax">c0</span><span class="plain-syntax"> >> </span><span class="constant-syntax">8</span><span class="plain-syntax">) % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">, (</span><span class="identifier-syntax">c0</span><span class="plain-syntax"> >> </span><span class="constant-syntax">16</span><span class="plain-syntax">) % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">, (</span><span class="identifier-syntax">c0</span><span class="plain-syntax"> >> </span><span class="constant-syntax">24</span><span class="plain-syntax">) % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%02x%02x%02x%02x"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">d0</span><span class="plain-syntax"> % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">, (</span><span class="identifier-syntax">d0</span><span class="plain-syntax"> >> </span><span class="constant-syntax">8</span><span class="plain-syntax">) % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">, (</span><span class="identifier-syntax">d0</span><span class="plain-syntax"> >> </span><span class="constant-syntax">16</span><span class="plain-syntax">) % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">, (</span><span class="identifier-syntax">d0</span><span class="plain-syntax"> >> </span><span class="constant-syntax">24</span><span class="plain-syntax">) % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">);</span>
|
|
|
|
<span class="plain-syntax"> </span><a href="6-bf.html#SP8" class="function-link"><span class="function-syntax">BinaryFiles::close</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bin</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP10_1" class="paragraph-anchor"></a><b>§10.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Process one byte of message</span><span class="named-paragraph-number">10.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">buffer</span><span class="plain-syntax">[</span><span class="identifier-syntax">bc</span><span class="plain-syntax">++] = (</span><span class="identifier-syntax">b</span><span class="plain-syntax"> % </span><span class="constant-syntax">0x100</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">bc</span><span class="plain-syntax"> == </span><span class="constant-syntax">64</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">bc</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">M</span><span class="plain-syntax">[16];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><16; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">M</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] = </span><span class="identifier-syntax">buffer</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">*4+3]*</span><span class="constant-syntax">0x1000000</span><span class="plain-syntax"> + </span><span class="identifier-syntax">buffer</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">*4+2]*</span><span class="constant-syntax">0x10000</span><span class="plain-syntax"> +</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">buffer</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">*4+1]*</span><span class="constant-syntax">0x100</span><span class="plain-syntax"> + </span><span class="identifier-syntax">buffer</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">*4+0];</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">A</span><span class="plain-syntax"> = </span><span class="identifier-syntax">a0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">B</span><span class="plain-syntax"> = </span><span class="identifier-syntax">b0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">C</span><span class="plain-syntax"> = </span><span class="identifier-syntax">c0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><span class="identifier-syntax">d0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><64; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="identifier-syntax">g</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> < </span><span class="constant-syntax">16</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">B</span><span class="plain-syntax"> & </span><span class="identifier-syntax">C</span><span class="plain-syntax">) | ((~ </span><span class="identifier-syntax">B</span><span class="plain-syntax">) & </span><span class="identifier-syntax">D</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">g</span><span class="plain-syntax"> = </span><span class="identifier-syntax">i</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> < </span><span class="constant-syntax">32</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">D</span><span class="plain-syntax"> & </span><span class="identifier-syntax">B</span><span class="plain-syntax">) | ((~ </span><span class="identifier-syntax">D</span><span class="plain-syntax">) & </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">g</span><span class="plain-syntax"> = (5*</span><span class="identifier-syntax">i</span><span class="plain-syntax"> + </span><span class="constant-syntax">1</span><span class="plain-syntax">) % </span><span class="constant-syntax">16</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> < </span><span class="constant-syntax">48</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><span class="identifier-syntax">B</span><span class="plain-syntax"> ^ </span><span class="identifier-syntax">C</span><span class="plain-syntax"> ^ </span><span class="identifier-syntax">D</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">g</span><span class="plain-syntax"> = (3*</span><span class="identifier-syntax">i</span><span class="plain-syntax"> + </span><span class="constant-syntax">5</span><span class="plain-syntax">) % </span><span class="constant-syntax">16</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><span class="identifier-syntax">C</span><span class="plain-syntax"> ^ (</span><span class="identifier-syntax">B</span><span class="plain-syntax"> | (~ </span><span class="identifier-syntax">D</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">g</span><span class="plain-syntax"> = (7*</span><span class="identifier-syntax">i</span><span class="plain-syntax">) % </span><span class="constant-syntax">16</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax"> += </span><span class="identifier-syntax">A</span><span class="plain-syntax"> + </span><span class="identifier-syntax">K</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] + </span><span class="identifier-syntax">M</span><span class="plain-syntax">[</span><span class="identifier-syntax">g</span><span class="plain-syntax">];</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">A</span><span class="plain-syntax"> = </span><span class="identifier-syntax">D</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><span class="identifier-syntax">C</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C</span><span class="plain-syntax"> = </span><span class="identifier-syntax">B</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">B</span><span class="plain-syntax"> = </span><span class="identifier-syntax">B</span><span class="plain-syntax"> + </span><a href="6-bf.html#SP11" class="function-link"><span class="function-syntax">BinaryFiles::rotate</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="identifier-syntax">s</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">a0</span><span class="plain-syntax"> += </span><span class="identifier-syntax">A</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">b0</span><span class="plain-syntax"> += </span><span class="identifier-syntax">B</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">c0</span><span class="plain-syntax"> += </span><span class="identifier-syntax">C</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">d0</span><span class="plain-syntax"> += </span><span class="identifier-syntax">D</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="6-bf.html#SP10">§10</a> (11 times).</li></ul>
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<p class="commentary firstcommentary"><a id="SP11" class="paragraph-anchor"></a><b>§11. </b>This is a C-compiler safe way to rotate a 32-bit unsigned integer left
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by <span class="extract"><span class="extract-syntax">shift</span></span> number of bits. Enjoy:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="function-syntax">BinaryFiles::rotate</span><button class="popup" onclick="togglePopup('usagePopup14')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup14">Usage of <span class="code-font"><span class="function-syntax">BinaryFiles::rotate</span></span>:<br/><a href="6-bf.html#SP10_1">§10.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">shift</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">shift</span><span class="plain-syntax"> &= </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">)*8 - </span><span class="constant-syntax">1</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">value</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> (</span><span class="identifier-syntax">value</span><span class="plain-syntax"> << </span><span class="identifier-syntax">shift</span><span class="plain-syntax">) | (</span><span class="identifier-syntax">value</span><span class="plain-syntax"> >> (</span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">)*8 - </span><span class="identifier-syntax">shift</span><span class="plain-syntax">));</span>
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<span class="plain-syntax">}</span>
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</pre>
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