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<span class="comment">// Copyright 2012-2016 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="comment">//</span>
<span class="comment">// Original authors: alexchrichton</span>
<span class="doccomment">//! Extra functions for `char`</span>
<span class="comment">// UTF-8 ranges and tags for encoding characters</span>
<span class="kw">const</span> <span class="ident">TAG_CONT</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">0b1000_0000</span>;
<span class="kw">const</span> <span class="ident">TAG_TWO_B</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">0b1100_0000</span>;
<span class="kw">const</span> <span class="ident">TAG_THREE_B</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">0b1110_0000</span>;
<span class="kw">const</span> <span class="ident">TAG_FOUR_B</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">0b1111_0000</span>;
<span class="kw">const</span> <span class="ident">MAX_ONE_B</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">0x80</span>;
<span class="kw">const</span> <span class="ident">MAX_TWO_B</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">0x800</span>;
<span class="kw">const</span> <span class="ident">MAX_THREE_B</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">0x10000</span>;
<span class="doccomment">/// Placeholder</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Copy</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">EncodeUtf8Error</span>(());
<span class="doccomment">/// Encode a char into buf using UTF-8.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// On success, return the byte length of the encoding (1, 2, 3 or 4).<br></span>
<span class="doccomment">/// On error, return `EncodeUtf8Error` if the buffer was too short for the char.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">encode_utf8</span>(<span class="ident">ch</span>: <span class="ident">char</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span>, <span class="ident">EncodeUtf8Error</span><span class="op">></span>
{
<span class="kw">let</span> <span class="ident">code</span> <span class="op">=</span> <span class="ident">ch</span> <span class="kw">as</span> <span class="ident">u32</span>;
<span class="kw">if</span> <span class="ident">code</span> <span class="op"><</span> <span class="ident">MAX_ONE_B</span> <span class="op">&&</span> <span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">>=</span> <span class="number">1</span> {
<span class="ident">buf</span>[<span class="number">0</span>] <span class="op">=</span> <span class="ident">code</span> <span class="kw">as</span> <span class="ident">u8</span>;
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="number">1</span>);
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">code</span> <span class="op"><</span> <span class="ident">MAX_TWO_B</span> <span class="op">&&</span> <span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">>=</span> <span class="number">2</span> {
<span class="ident">buf</span>[<span class="number">0</span>] <span class="op">=</span> (<span class="ident">code</span> <span class="op">>></span> <span class="number">6</span> <span class="op">&</span> <span class="number">0x1F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_TWO_B</span>;
<span class="ident">buf</span>[<span class="number">1</span>] <span class="op">=</span> (<span class="ident">code</span> <span class="op">&</span> <span class="number">0x3F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_CONT</span>;
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="number">2</span>);
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">code</span> <span class="op"><</span> <span class="ident">MAX_THREE_B</span> <span class="op">&&</span> <span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">>=</span> <span class="number">3</span> {
<span class="ident">buf</span>[<span class="number">0</span>] <span class="op">=</span> (<span class="ident">code</span> <span class="op">>></span> <span class="number">12</span> <span class="op">&</span> <span class="number">0x0F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_THREE_B</span>;
<span class="ident">buf</span>[<span class="number">1</span>] <span class="op">=</span> (<span class="ident">code</span> <span class="op">>></span> <span class="number">6</span> <span class="op">&</span> <span class="number">0x3F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_CONT</span>;
<span class="ident">buf</span>[<span class="number">2</span>] <span class="op">=</span> (<span class="ident">code</span> <span class="op">&</span> <span class="number">0x3F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_CONT</span>;
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="number">3</span>);
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">>=</span> <span class="number">4</span> {
<span class="ident">buf</span>[<span class="number">0</span>] <span class="op">=</span> (<span class="ident">code</span> <span class="op">>></span> <span class="number">18</span> <span class="op">&</span> <span class="number">0x07</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_FOUR_B</span>;
<span class="ident">buf</span>[<span class="number">1</span>] <span class="op">=</span> (<span class="ident">code</span> <span class="op">>></span> <span class="number">12</span> <span class="op">&</span> <span class="number">0x3F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_CONT</span>;
<span class="ident">buf</span>[<span class="number">2</span>] <span class="op">=</span> (<span class="ident">code</span> <span class="op">>></span> <span class="number">6</span> <span class="op">&</span> <span class="number">0x3F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_CONT</span>;
<span class="ident">buf</span>[<span class="number">3</span>] <span class="op">=</span> (<span class="ident">code</span> <span class="op">&</span> <span class="number">0x3F</span>) <span class="kw">as</span> <span class="ident">u8</span> <span class="op">|</span> <span class="ident">TAG_CONT</span>;
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="number">4</span>);
};
<span class="prelude-val">Err</span>(<span class="ident">EncodeUtf8Error</span>(()))
}
</pre>
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