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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `src/encoding/hex/encode.rs`."><title>encode.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../../static.files/rustdoc-fecee23daa4e8a6d.css"><meta name="rustdoc-vars" data-root-path="../../../../" data-static-root-path="../../../../static.files/" data-current-crate="wiwi" data-themes="meadow" data-resource-suffix="" data-rustdoc-version="1.83.0-nightly (d6c8169c1 2024-09-03)" data-channel="nightly" data-search-js="search-a99f1315e7cc5121.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="../../../../static.files/src-script-e66d777a5a92e9b2.js"></script><script defer src="../../../../src-files.js"></script><script defer src="../../../../static.files/main-921df33f47b8780c.js"></script><noscript><link rel="stylesheet" href="../../../../static.files/noscript-3b12f09e550e0385.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers"><a href="#1" id="1">1</a>
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</pre></div><pre class="rust"><code><span class="doccomment">//! Internal encoding implementations

</span><span class="kw">use </span><span class="kw">crate</span>::util_unsafe::UnsafeBufWriteGuard;

<span class="doccomment">/// Length of encoding table (not actually used in encoding/decoding data)
</span><span class="kw">pub const </span>TABLE_ENCODER_LEN: usize = <span class="number">16</span>;

<span class="doccomment">/// Encoding table of lowercased characters, length 16, mapping a value from 0-15
/// to a hex byte (lower letters)
///
/// Note: this table is not actually used in the encoding/decoding implementation
</span><span class="kw">pub static </span>TABLE_ENCODER_LOWER: [u8; TABLE_ENCODER_LEN] = <span class="kw-2">*</span><span class="string">b"0123456789abcdef"</span>;

<span class="doccomment">/// Encoding table of uppercased characters, length 16, mapping a value from 0-15
/// to a hex byte (upper letters)
///
/// Note: this table is not actually used in the encoding/decoding implementation
</span><span class="kw">pub static </span>TABLE_ENCODER_UPPER: [u8; TABLE_ENCODER_LEN] = <span class="kw-2">*</span><span class="string">b"0123456789ABCDEF"</span>;

<span class="doccomment">/// Reads `rounds` bytes from `bytes_ptr`, encoding them into 2 hex chars
/// per byte, then writes the output into `dest`
///
/// # SAFETY
///
/// - `bytes_ptr` must be valid for `num_rounds` bytes of reads
/// - `dest` must have enough capacity to write `num_rounds * 2` bytes into
</span><span class="kw">pub unsafe fn </span>generic&lt;<span class="kw">const </span>UPPER: bool&gt;(
<span class="kw-2">mut </span>bytes_ptr: <span class="kw-2">*const </span>u8,
dest: <span class="kw-2">&amp;mut </span>UnsafeBufWriteGuard,
rounds: usize
) {
<span class="kw">let </span>char_a = <span class="kw">if </span>UPPER { <span class="string">b'A' </span>} <span class="kw">else </span>{ <span class="string">b'a' </span>} - <span class="number">10</span>;
<span class="kw">let </span>char_0 = <span class="string">b'0'</span>;

<span class="kw">for _ in </span><span class="number">0</span>..rounds {
<span class="comment">// SAFETY: we loop `num_rounds` times only, reading a byte each time,
// and caller promises that `bytes_ptr` is valid to read for at least
// that many bytes
</span><span class="kw">let </span>byte = <span class="kw">unsafe </span>{ <span class="kw-2">*</span>bytes_ptr };

<span class="comment">// SAFETY: same invariant as above. It's sound to have the pointer pointing
// to the end of the memory section (as long as it isn't dereferenced)
</span>bytes_ptr = <span class="kw">unsafe </span>{ bytes_ptr.add(<span class="number">1</span>) };

<span class="kw">let </span>char1 = byte &gt;&gt; <span class="number">4</span>;
<span class="kw">let </span>char2 = byte &amp; <span class="number">0xf</span>;

<span class="kw">let </span>chars = [
<span class="kw">if </span>char1 &gt; <span class="number">9 </span>{ char_a } <span class="kw">else </span>{ char_0 } + char1,
<span class="kw">if </span>char2 &gt; <span class="number">9 </span>{ char_a } <span class="kw">else </span>{ char_0 } + char2
];

<span class="comment">// SAFETY: caller guarantees `dest` is writeable to for at least
// `num_rounds * 2` bytes, so we can write 2 bytes every iteration
</span><span class="kw">unsafe </span>{ dest.write_bytes_const::&lt;<span class="number">2</span>&gt;(chars.as_ptr()) }
}
}
</code></pre></div></section></main></body></html>
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