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</pre><pre class="rust"><code><span class="comment">// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// &lt;https://github.com/rust-lang/rust/blob/HEAD/COPYRIGHT&gt;.
//
// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license
// &lt;LICENSE-MIT or https://opensource.org/licenses/MIT&gt;, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
</span><span class="kw">use </span>std::cmp;
<span class="kw">use </span>std::io;
<span class="kw">use </span>std::io::prelude::<span class="kw-2">*</span>;
<span class="kw">use </span>std::mem;
<span class="kw">pub struct </span>BufReader&lt;R&gt; {
inner: R,
buf: Box&lt;[u8]&gt;,
pos: usize,
cap: usize,
}
<span class="kw">impl</span>&lt;R&gt; ::std::fmt::Debug <span class="kw">for </span>BufReader&lt;R&gt;
<span class="kw">where
</span>R: ::std::fmt::Debug,
{
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>::std::fmt::Formatter) -&gt; <span class="prelude-ty">Result</span>&lt;(), ::std::fmt::Error&gt; {
fmt.debug_struct(<span class="string">&quot;BufReader&quot;</span>)
.field(<span class="string">&quot;reader&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.inner)
.field(
<span class="string">&quot;buffer&quot;</span>,
<span class="kw-2">&amp;</span><span class="macro">format_args!</span>(<span class="string">&quot;{}/{}&quot;</span>, <span class="self">self</span>.cap - <span class="self">self</span>.pos, <span class="self">self</span>.buf.len()),
)
.finish()
}
}
<span class="kw">impl</span>&lt;R: Read&gt; BufReader&lt;R&gt; {
<span class="kw">pub fn </span>new(inner: R) -&gt; BufReader&lt;R&gt; {
BufReader::with_buf(<span class="macro">vec!</span>[<span class="number">0</span>; <span class="number">32 </span>* <span class="number">1024</span>], inner)
}
<span class="kw">pub fn </span>with_buf(buf: Vec&lt;u8&gt;, inner: R) -&gt; BufReader&lt;R&gt; {
BufReader {
inner,
buf: buf.into_boxed_slice(),
pos: <span class="number">0</span>,
cap: <span class="number">0</span>,
}
}
}
<span class="kw">impl</span>&lt;R&gt; BufReader&lt;R&gt; {
<span class="kw">pub fn </span>get_ref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>R {
<span class="kw-2">&amp;</span><span class="self">self</span>.inner
}
<span class="kw">pub fn </span>get_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>R {
<span class="kw-2">&amp;mut </span><span class="self">self</span>.inner
}
<span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -&gt; R {
<span class="self">self</span>.inner
}
<span class="kw">pub fn </span>reset(<span class="kw-2">&amp;mut </span><span class="self">self</span>, inner: R) -&gt; R {
<span class="self">self</span>.pos = <span class="number">0</span>;
<span class="self">self</span>.cap = <span class="number">0</span>;
mem::replace(<span class="kw-2">&amp;mut </span><span class="self">self</span>.inner, inner)
}
}
<span class="kw">impl</span>&lt;R: Read&gt; Read <span class="kw">for </span>BufReader&lt;R&gt; {
<span class="kw">fn </span>read(<span class="kw-2">&amp;mut </span><span class="self">self</span>, buf: <span class="kw-2">&amp;mut </span>[u8]) -&gt; io::Result&lt;usize&gt; {
<span class="comment">// If we don&#39;t have any buffered data and we&#39;re doing a massive read
// (larger than our internal buffer), bypass our internal buffer
// entirely.
</span><span class="kw">if </span><span class="self">self</span>.pos == <span class="self">self</span>.cap &amp;&amp; buf.len() &gt;= <span class="self">self</span>.buf.len() {
<span class="kw">return </span><span class="self">self</span>.inner.read(buf);
}
<span class="kw">let </span>nread = {
<span class="kw">let </span><span class="kw-2">mut </span>rem = <span class="self">self</span>.fill_buf()<span class="question-mark">?</span>;
rem.read(buf)<span class="question-mark">?
</span>};
<span class="self">self</span>.consume(nread);
<span class="prelude-val">Ok</span>(nread)
}
}
<span class="kw">impl</span>&lt;R: Read&gt; BufRead <span class="kw">for </span>BufReader&lt;R&gt; {
<span class="kw">fn </span>fill_buf(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;<span class="kw-2">&amp;</span>[u8]&gt; {
<span class="comment">// If we&#39;ve reached the end of our internal buffer then we need to fetch
// some more data from the underlying reader.
</span><span class="kw">if </span><span class="self">self</span>.pos == <span class="self">self</span>.cap {
<span class="self">self</span>.cap = <span class="self">self</span>.inner.read(<span class="kw-2">&amp;mut </span><span class="self">self</span>.buf)<span class="question-mark">?</span>;
<span class="self">self</span>.pos = <span class="number">0</span>;
}
<span class="prelude-val">Ok</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.buf[<span class="self">self</span>.pos..<span class="self">self</span>.cap])
}
<span class="kw">fn </span>consume(<span class="kw-2">&amp;mut </span><span class="self">self</span>, amt: usize) {
<span class="self">self</span>.pos = cmp::min(<span class="self">self</span>.pos + amt, <span class="self">self</span>.cap);
}
}
</code></pre></div>
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