| <!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 `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.28/src/io/buf_writer.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>buf_writer.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../futures_util/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../futures_util/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">super</span>::DEFAULT_BUF_SIZE; |
| <span class="kw">use </span>futures_core::ready; |
| <span class="kw">use </span>futures_core::task::{Context, Poll}; |
| <span class="kw">use </span>futures_io::{AsyncBufRead, AsyncRead, AsyncSeek, AsyncWrite, IoSlice, SeekFrom}; |
| <span class="kw">use </span>pin_project_lite::pin_project; |
| <span class="kw">use </span>std::fmt; |
| <span class="kw">use </span>std::io::{<span class="self">self</span>, Write}; |
| <span class="kw">use </span>std::pin::Pin; |
| <span class="kw">use </span>std::ptr; |
| |
| <span class="macro">pin_project! </span>{ |
| <span class="doccomment">/// Wraps a writer and buffers its output. |
| /// |
| /// It can be excessively inefficient to work directly with something that |
| /// implements [`AsyncWrite`]. A `BufWriter` keeps an in-memory buffer of data and |
| /// writes it to an underlying writer in large, infrequent batches. |
| /// |
| /// `BufWriter` can improve the speed of programs that make *small* and |
| /// *repeated* write calls to the same file or network socket. It does not |
| /// help when writing very large amounts at once, or writing just one or a few |
| /// times. It also provides no advantage when writing to a destination that is |
| /// in memory, like a `Vec<u8>`. |
| /// |
| /// When the `BufWriter` is dropped, the contents of its buffer will be |
| /// discarded. Creating multiple instances of a `BufWriter` on the same |
| /// stream can cause data loss. If you need to write out the contents of its |
| /// buffer, you must manually call flush before the writer is dropped. |
| /// |
| /// [`AsyncWrite`]: futures_io::AsyncWrite |
| /// [`flush`]: super::AsyncWriteExt::flush |
| /// |
| </span><span class="comment">// TODO: Examples |
| </span><span class="kw">pub struct </span>BufWriter<W> { |
| <span class="attribute">#[pin] |
| </span>inner: W, |
| buf: Vec<u8>, |
| written: usize, |
| } |
| } |
| |
| <span class="kw">impl</span><W: AsyncWrite> BufWriter<W> { |
| <span class="doccomment">/// Creates a new `BufWriter` with a default buffer capacity. The default is currently 8 KB, |
| /// but may change in the future. |
| </span><span class="kw">pub fn </span>new(inner: W) -> <span class="self">Self </span>{ |
| <span class="self">Self</span>::with_capacity(DEFAULT_BUF_SIZE, inner) |
| } |
| |
| <span class="doccomment">/// Creates a new `BufWriter` with the specified buffer capacity. |
| </span><span class="kw">pub fn </span>with_capacity(cap: usize, inner: W) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ inner, buf: Vec::with_capacity(cap), written: <span class="number">0 </span>} |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>flush_buf(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<io::Result<()>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>this = <span class="self">self</span>.project(); |
| |
| <span class="kw">let </span>len = this.buf.len(); |
| <span class="kw">let </span><span class="kw-2">mut </span>ret = <span class="prelude-val">Ok</span>(()); |
| <span class="kw">while </span><span class="kw-2">*</span>this.written < len { |
| <span class="kw">match </span><span class="macro">ready!</span>(this.inner.as_mut().poll_write(cx, <span class="kw-2">&</span>this.buf[<span class="kw-2">*</span>this.written..])) { |
| <span class="prelude-val">Ok</span>(<span class="number">0</span>) => { |
| ret = <span class="prelude-val">Err</span>(io::Error::new( |
| io::ErrorKind::WriteZero, |
| <span class="string">"failed to write the buffered data"</span>, |
| )); |
| <span class="kw">break</span>; |
| } |
| <span class="prelude-val">Ok</span>(n) => <span class="kw-2">*</span>this.written += n, |
| <span class="prelude-val">Err</span>(e) => { |
| ret = <span class="prelude-val">Err</span>(e); |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| <span class="kw">if </span><span class="kw-2">*</span>this.written > <span class="number">0 </span>{ |
| this.buf.drain(..<span class="kw-2">*</span>this.written); |
| } |
| <span class="kw-2">*</span>this.written = <span class="number">0</span>; |
| Poll::Ready(ret) |
| } |
| |
| <span class="macro">delegate_access_inner!</span>(inner, W, ()); |
| |
| <span class="doccomment">/// Returns a reference to the internally buffered data. |
| </span><span class="kw">pub fn </span>buffer(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] { |
| <span class="kw-2">&</span><span class="self">self</span>.buf |
| } |
| |
| <span class="doccomment">/// Capacity of `buf`. how many chars can be held in buffer |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>capacity(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.buf.capacity() |
| } |
| |
| <span class="doccomment">/// Remaining number of bytes to reach `buf` 's capacity |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>spare_capacity(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.buf.capacity() - <span class="self">self</span>.buf.len() |
| } |
| |
| <span class="doccomment">/// Write a byte slice directly into buffer |
| /// |
| /// Will truncate the number of bytes written to `spare_capacity()` so you want to |
| /// calculate the size of your slice to avoid losing bytes |
| /// |
| /// Based on `std::io::BufWriter` |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>write_to_buf(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, buf: <span class="kw-2">&</span>[u8]) -> usize { |
| <span class="kw">let </span>available = <span class="self">self</span>.spare_capacity(); |
| <span class="kw">let </span>amt_to_buffer = available.min(buf.len()); |
| |
| <span class="comment">// SAFETY: `amt_to_buffer` is <= buffer's spare capacity by construction. |
| </span><span class="kw">unsafe </span>{ |
| <span class="self">self</span>.write_to_buffer_unchecked(<span class="kw-2">&</span>buf[..amt_to_buffer]); |
| } |
| |
| amt_to_buffer |
| } |
| |
| <span class="doccomment">/// Write byte slice directly into `self.buf` |
| /// |
| /// Based on `std::io::BufWriter` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">unsafe fn </span>write_to_buffer_unchecked(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, buf: <span class="kw-2">&</span>[u8]) { |
| <span class="macro">debug_assert!</span>(buf.len() <= <span class="self">self</span>.spare_capacity()); |
| <span class="kw">let </span>this = <span class="self">self</span>.project(); |
| <span class="kw">let </span>old_len = this.buf.len(); |
| <span class="kw">let </span>buf_len = buf.len(); |
| <span class="kw">let </span>src = buf.as_ptr(); |
| <span class="kw">let </span>dst = this.buf.as_mut_ptr().add(old_len); |
| ptr::copy_nonoverlapping(src, dst, buf_len); |
| this.buf.set_len(old_len + buf_len); |
| } |
| |
| <span class="doccomment">/// Write directly using `inner`, bypassing buffering |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>inner_poll_write( |
| <span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| buf: <span class="kw-2">&</span>[u8], |
| ) -> Poll<io::Result<usize>> { |
| <span class="self">self</span>.project().inner.poll_write(cx, buf) |
| } |
| |
| <span class="doccomment">/// Write directly using `inner`, bypassing buffering |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>inner_poll_write_vectored( |
| <span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| bufs: <span class="kw-2">&</span>[IoSlice<<span class="lifetime">'_</span>>], |
| ) -> Poll<io::Result<usize>> { |
| <span class="self">self</span>.project().inner.poll_write_vectored(cx, bufs) |
| } |
| } |
| |
| <span class="kw">impl</span><W: AsyncWrite> AsyncWrite <span class="kw">for </span>BufWriter<W> { |
| <span class="kw">fn </span>poll_write( |
| <span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| buf: <span class="kw-2">&</span>[u8], |
| ) -> Poll<io::Result<usize>> { |
| <span class="kw">if </span><span class="self">self</span>.buf.len() + buf.len() > <span class="self">self</span>.buf.capacity() { |
| <span class="macro">ready!</span>(<span class="self">self</span>.as_mut().flush_buf(cx))<span class="question-mark">?</span>; |
| } |
| <span class="kw">if </span>buf.len() >= <span class="self">self</span>.buf.capacity() { |
| <span class="self">self</span>.project().inner.poll_write(cx, buf) |
| } <span class="kw">else </span>{ |
| Poll::Ready(<span class="self">self</span>.project().buf.write(buf)) |
| } |
| } |
| |
| <span class="kw">fn </span>poll_write_vectored( |
| <span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| bufs: <span class="kw-2">&</span>[IoSlice<<span class="lifetime">'_</span>>], |
| ) -> Poll<io::Result<usize>> { |
| <span class="kw">let </span>total_len = bufs.iter().map(|b| b.len()).sum::<usize>(); |
| <span class="kw">if </span><span class="self">self</span>.buf.len() + total_len > <span class="self">self</span>.buf.capacity() { |
| <span class="macro">ready!</span>(<span class="self">self</span>.as_mut().flush_buf(cx))<span class="question-mark">?</span>; |
| } |
| <span class="kw">if </span>total_len >= <span class="self">self</span>.buf.capacity() { |
| <span class="self">self</span>.project().inner.poll_write_vectored(cx, bufs) |
| } <span class="kw">else </span>{ |
| Poll::Ready(<span class="self">self</span>.project().buf.write_vectored(bufs)) |
| } |
| } |
| |
| <span class="kw">fn </span>poll_flush(<span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<io::Result<()>> { |
| <span class="macro">ready!</span>(<span class="self">self</span>.as_mut().flush_buf(cx))<span class="question-mark">?</span>; |
| <span class="self">self</span>.project().inner.poll_flush(cx) |
| } |
| |
| <span class="kw">fn </span>poll_close(<span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<io::Result<()>> { |
| <span class="macro">ready!</span>(<span class="self">self</span>.as_mut().flush_buf(cx))<span class="question-mark">?</span>; |
| <span class="self">self</span>.project().inner.poll_close(cx) |
| } |
| } |
| |
| <span class="kw">impl</span><W: AsyncRead> AsyncRead <span class="kw">for </span>BufWriter<W> { |
| <span class="macro">delegate_async_read!</span>(inner); |
| } |
| |
| <span class="kw">impl</span><W: AsyncBufRead> AsyncBufRead <span class="kw">for </span>BufWriter<W> { |
| <span class="macro">delegate_async_buf_read!</span>(inner); |
| } |
| |
| <span class="kw">impl</span><W: fmt::Debug> fmt::Debug <span class="kw">for </span>BufWriter<W> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| f.debug_struct(<span class="string">"BufWriter"</span>) |
| .field(<span class="string">"writer"</span>, <span class="kw-2">&</span><span class="self">self</span>.inner) |
| .field(<span class="string">"buffer"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}/{}"</span>, <span class="self">self</span>.buf.len(), <span class="self">self</span>.buf.capacity())) |
| .field(<span class="string">"written"</span>, <span class="kw-2">&</span><span class="self">self</span>.written) |
| .finish() |
| } |
| } |
| |
| <span class="kw">impl</span><W: AsyncWrite + AsyncSeek> AsyncSeek <span class="kw">for </span>BufWriter<W> { |
| <span class="doccomment">/// Seek to the offset, in bytes, in the underlying writer. |
| /// |
| /// Seeking always writes out the internal buffer before seeking. |
| </span><span class="kw">fn </span>poll_seek( |
| <span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| pos: SeekFrom, |
| ) -> Poll<io::Result<u64>> { |
| <span class="macro">ready!</span>(<span class="self">self</span>.as_mut().flush_buf(cx))<span class="question-mark">?</span>; |
| <span class="self">self</span>.project().inner.poll_seek(cx, pos) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="futures_util" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
