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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 `/root/.cargo/git/checkouts/tokio-377c595163f99a10/dfe252d/tokio/src/io/util/async_read_ext.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>async_read_ext.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="../../../../tokio/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="../../../../tokio/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">crate</span>::io::util::chain::{chain, Chain};
<span class="kw">use </span><span class="kw">crate</span>::io::util::read::{read, Read};
<span class="kw">use </span><span class="kw">crate</span>::io::util::read_buf::{read_buf, ReadBuf};
<span class="kw">use </span><span class="kw">crate</span>::io::util::read_exact::{read_exact, ReadExact};
<span class="kw">use </span><span class="kw">crate</span>::io::util::read_int::{ReadF32, ReadF32Le, ReadF64, ReadF64Le};
<span class="kw">use </span><span class="kw">crate</span>::io::util::read_int::{
ReadI128, ReadI128Le, ReadI16, ReadI16Le, ReadI32, ReadI32Le, ReadI64, ReadI64Le, ReadI8,
};
<span class="kw">use </span><span class="kw">crate</span>::io::util::read_int::{
ReadU128, ReadU128Le, ReadU16, ReadU16Le, ReadU32, ReadU32Le, ReadU64, ReadU64Le, ReadU8,
};
<span class="kw">use </span><span class="kw">crate</span>::io::util::read_to_end::{read_to_end, ReadToEnd};
<span class="kw">use </span><span class="kw">crate</span>::io::util::read_to_string::{read_to_string, ReadToString};
<span class="kw">use </span><span class="kw">crate</span>::io::util::take::{take, Take};
<span class="kw">use </span><span class="kw">crate</span>::io::AsyncRead;
<span class="kw">use </span>bytes::BufMut;
<span class="macro">cfg_io_util! </span>{
<span class="doccomment">/// Defines numeric reader
</span><span class="macro">macro_rules! </span>read_impl {
(
$(
$(<span class="attribute">#[<span class="macro-nonterminal">$outer</span>:meta]</span>)*
<span class="kw">fn </span><span class="macro-nonterminal">$name</span>:ident(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; $(<span class="macro-nonterminal">$fut</span>:ident)<span class="kw-2">*</span>;
)*
) =&gt; {
$(
$(<span class="attribute">#[<span class="macro-nonterminal">$outer</span>]</span>)*
<span class="kw">fn </span><span class="macro-nonterminal">$name</span>&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span><span class="self">self</span>) -&gt; $(<span class="macro-nonterminal">$fut</span>)<span class="kw-2">*</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span><span class="self">Self</span>&gt; <span class="kw">where </span><span class="self">Self</span>: Unpin {
$(<span class="macro-nonterminal">$fut</span>)<span class="kw-2">*</span>::new(<span class="self">self</span>)
}
)*
}
}
<span class="doccomment">/// Reads bytes from a source.
///
/// Implemented as an extension trait, adding utility methods to all
/// [`AsyncRead`] types. Callers will tend to import this trait instead of
/// [`AsyncRead`].
///
/// ```no_run
/// use tokio::fs::File;
/// use tokio::io::{self, AsyncReadExt};
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut f = File::open(&quot;foo.txt&quot;).await?;
/// let mut buffer = [0; 10];
///
/// // The `read` method is defined by this trait.
/// let n = f.read(&amp;mut buffer[..]).await?;
///
/// Ok(())
/// }
/// ```
///
/// See [module][crate::io] documentation for more details.
///
/// [`AsyncRead`]: AsyncRead
</span><span class="kw">pub trait </span>AsyncReadExt: AsyncRead {
<span class="doccomment">/// Creates a new `AsyncRead` instance that chains this stream with
/// `next`.
///
/// The returned `AsyncRead` instance will first read all bytes from this object
/// until EOF is encountered. Afterwards the output is equivalent to the
/// output of `next`.
///
/// # Examples
///
/// [`File`][crate::fs::File]s implement `AsyncRead`:
///
/// ```no_run
/// use tokio::fs::File;
/// use tokio::io::{self, AsyncReadExt};
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let f1 = File::open(&quot;foo.txt&quot;).await?;
/// let f2 = File::open(&quot;bar.txt&quot;).await?;
///
/// let mut handle = f1.chain(f2);
/// let mut buffer = String::new();
///
/// // read the value into a String. We could use any AsyncRead
/// // method here, this is just one example.
/// handle.read_to_string(&amp;mut buffer).await?;
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>chain&lt;R&gt;(<span class="self">self</span>, next: R) -&gt; Chain&lt;<span class="self">Self</span>, R&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized,
R: AsyncRead,
{
chain(<span class="self">self</span>, next)
}
<span class="doccomment">/// Pulls some bytes from this source into the specified buffer,
/// returning how many bytes were read.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read(&amp;mut self, buf: &amp;mut [u8]) -&gt; io::Result&lt;usize&gt;;
/// ```
///
/// This method does not provide any guarantees about whether it
/// completes immediately or asynchronously.
///
/// # Return
///
/// If the return value of this method is `Ok(n)`, then it must be
/// guaranteed that `0 &lt;= n &lt;= buf.len()`. A nonzero `n` value indicates
/// that the buffer `buf` has been filled in with `n` bytes of data from
/// this source. If `n` is `0`, then it can indicate one of two
/// scenarios:
///
/// 1. This reader has reached its &quot;end of file&quot; and will likely no longer
/// be able to produce bytes. Note that this does not mean that the
/// reader will *always* no longer be able to produce bytes.
/// 2. The buffer specified was 0 bytes in length.
///
/// No guarantees are provided about the contents of `buf` when this
/// function is called, implementations cannot rely on any property of the
/// contents of `buf` being `true`. It is recommended that *implementations*
/// only write data to `buf` instead of reading its contents.
///
/// Correspondingly, however, *callers* of this method may not assume
/// any guarantees about how the implementation uses `buf`. It is
/// possible that the code that&#39;s supposed to write to the buffer might
/// also read from it. It is your responsibility to make sure that `buf`
/// is initialized before calling `read`.
///
/// # Errors
///
/// If this function encounters any form of I/O or other error, an error
/// variant will be returned. If an error is returned then it must be
/// guaranteed that no bytes were read.
///
/// # Cancel safety
///
/// This method is cancel safe. If you use it as the event in a
/// [`tokio::select!`](crate::select) statement and some other branch
/// completes first, then it is guaranteed that no data was read.
///
/// # Examples
///
/// [`File`][crate::fs::File]s implement `Read`:
///
/// ```no_run
/// use tokio::fs::File;
/// use tokio::io::{self, AsyncReadExt};
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut f = File::open(&quot;foo.txt&quot;).await?;
/// let mut buffer = [0; 10];
///
/// // read up to 10 bytes
/// let n = f.read(&amp;mut buffer[..]).await?;
///
/// println!(&quot;The bytes: {:?}&quot;, &amp;buffer[..n]);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span><span class="self">self</span>, buf: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>[u8]) -&gt; Read&lt;<span class="lifetime">&#39;a</span>, <span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Unpin,
{
read(<span class="self">self</span>, buf)
}
<span class="doccomment">/// Pulls some bytes from this source into the specified buffer,
/// advancing the buffer&#39;s internal cursor.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_buf&lt;B: BufMut&gt;(&amp;mut self, buf: &amp;mut B) -&gt; io::Result&lt;usize&gt;;
/// ```
///
/// Usually, only a single `read` syscall is issued, even if there is
/// more space in the supplied buffer.
///
/// This method does not provide any guarantees about whether it
/// completes immediately or asynchronously.
///
/// # Return
///
/// A nonzero `n` value indicates that the buffer `buf` has been filled
/// in with `n` bytes of data from this source. If `n` is `0`, then it
/// can indicate one of two scenarios:
///
/// 1. This reader has reached its &quot;end of file&quot; and will likely no longer
/// be able to produce bytes. Note that this does not mean that the
/// reader will *always* no longer be able to produce bytes.
/// 2. The buffer specified had a remaining capacity of zero.
///
/// # Errors
///
/// If this function encounters any form of I/O or other error, an error
/// variant will be returned. If an error is returned then it must be
/// guaranteed that no bytes were read.
///
/// # Cancel safety
///
/// This method is cancel safe. If you use it as the event in a
/// [`tokio::select!`](crate::select) statement and some other branch
/// completes first, then it is guaranteed that no data was read.
///
/// # Examples
///
/// [`File`] implements `Read` and [`BytesMut`] implements [`BufMut`]:
///
/// [`File`]: crate::fs::File
/// [`BytesMut`]: bytes::BytesMut
/// [`BufMut`]: bytes::BufMut
///
/// ```no_run
/// use tokio::fs::File;
/// use tokio::io::{self, AsyncReadExt};
///
/// use bytes::BytesMut;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut f = File::open(&quot;foo.txt&quot;).await?;
/// let mut buffer = BytesMut::with_capacity(10);
///
/// assert!(buffer.is_empty());
///
/// // read up to 10 bytes, note that the return value is not needed
/// // to access the data that was read as `buffer`&#39;s internal
/// // cursor is updated.
/// f.read_buf(&amp;mut buffer).await?;
///
/// println!(&quot;The bytes: {:?}&quot;, &amp;buffer[..]);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_buf&lt;<span class="lifetime">&#39;a</span>, B&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span><span class="self">self</span>, buf: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>B) -&gt; ReadBuf&lt;<span class="lifetime">&#39;a</span>, <span class="self">Self</span>, B&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized + Unpin,
B: BufMut,
{
read_buf(<span class="self">self</span>, buf)
}
<span class="doccomment">/// Reads the exact number of bytes required to fill `buf`.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_exact(&amp;mut self, buf: &amp;mut [u8]) -&gt; io::Result&lt;usize&gt;;
/// ```
///
/// This function reads as many bytes as necessary to completely fill
/// the specified buffer `buf`.
///
/// # Errors
///
/// If the operation encounters an &quot;end of file&quot; before completely
/// filling the buffer, it returns an error of the kind
/// [`ErrorKind::UnexpectedEof`]. The contents of `buf` are unspecified
/// in this case.
///
/// If any other read error is encountered then the operation
/// immediately returns. The contents of `buf` are unspecified in this
/// case.
///
/// If this operation returns an error, it is unspecified how many bytes
/// it has read, but it will never read more than would be necessary to
/// completely fill the buffer.
///
/// # Cancel safety
///
/// This method is not cancellation safe. If the method is used as the
/// event in a [`tokio::select!`](crate::select) statement and some
/// other branch completes first, then some data may already have been
/// read into `buf`.
///
/// # Examples
///
/// [`File`][crate::fs::File]s implement `Read`:
///
/// ```no_run
/// use tokio::fs::File;
/// use tokio::io::{self, AsyncReadExt};
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut f = File::open(&quot;foo.txt&quot;).await?;
/// let mut buffer = [0; 10];
///
/// // read exactly 10 bytes
/// f.read_exact(&amp;mut buffer).await?;
/// Ok(())
/// }
/// ```
///
/// [`ErrorKind::UnexpectedEof`]: std::io::ErrorKind::UnexpectedEof
</span><span class="kw">fn </span>read_exact&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span><span class="self">self</span>, buf: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>[u8]) -&gt; ReadExact&lt;<span class="lifetime">&#39;a</span>, <span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Unpin,
{
read_exact(<span class="self">self</span>, buf)
}
<span class="macro">read_impl! </span>{
<span class="doccomment">/// Reads an unsigned 8 bit integer from the underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_u8(&amp;mut self) -&gt; io::Result&lt;u8&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read unsigned 8 bit integers from an `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![2, 5]);
///
/// assert_eq!(2, reader.read_u8().await?);
/// assert_eq!(5, reader.read_u8().await?);
///
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_u8(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadU8;
<span class="doccomment">/// Reads a signed 8 bit integer from the underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_i8(&amp;mut self) -&gt; io::Result&lt;i8&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read unsigned 8 bit integers from an `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![0x02, 0xfb]);
///
/// assert_eq!(2, reader.read_i8().await?);
/// assert_eq!(-5, reader.read_i8().await?);
///
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_i8(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadI8;
<span class="doccomment">/// Reads an unsigned 16-bit integer in big-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_u16(&amp;mut self) -&gt; io::Result&lt;u16&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read unsigned 16 bit big-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![2, 5, 3, 0]);
///
/// assert_eq!(517, reader.read_u16().await?);
/// assert_eq!(768, reader.read_u16().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_u16(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadU16;
<span class="doccomment">/// Reads a signed 16-bit integer in big-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_i16(&amp;mut self) -&gt; io::Result&lt;i16&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read signed 16 bit big-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![0x00, 0xc1, 0xff, 0x7c]);
///
/// assert_eq!(193, reader.read_i16().await?);
/// assert_eq!(-132, reader.read_i16().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_i16(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadI16;
<span class="doccomment">/// Reads an unsigned 32-bit integer in big-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_u32(&amp;mut self) -&gt; io::Result&lt;u32&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read unsigned 32-bit big-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![0x00, 0x00, 0x01, 0x0b]);
///
/// assert_eq!(267, reader.read_u32().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_u32(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadU32;
<span class="doccomment">/// Reads a signed 32-bit integer in big-endian order from the
/// underlying reader.
///
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_i32(&amp;mut self) -&gt; io::Result&lt;i32&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read signed 32-bit big-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![0xff, 0xff, 0x7a, 0x33]);
///
/// assert_eq!(-34253, reader.read_i32().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_i32(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadI32;
<span class="doccomment">/// Reads an unsigned 64-bit integer in big-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_u64(&amp;mut self) -&gt; io::Result&lt;u64&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read unsigned 64-bit big-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![
/// 0x00, 0x03, 0x43, 0x95, 0x4d, 0x60, 0x86, 0x83
/// ]);
///
/// assert_eq!(918733457491587, reader.read_u64().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_u64(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadU64;
<span class="doccomment">/// Reads an signed 64-bit integer in big-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_i64(&amp;mut self) -&gt; io::Result&lt;i64&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read signed 64-bit big-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![0x80, 0, 0, 0, 0, 0, 0, 0]);
///
/// assert_eq!(i64::MIN, reader.read_i64().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_i64(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadI64;
<span class="doccomment">/// Reads an unsigned 128-bit integer in big-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_u128(&amp;mut self) -&gt; io::Result&lt;u128&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read unsigned 128-bit big-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![
/// 0x00, 0x03, 0x43, 0x95, 0x4d, 0x60, 0x86, 0x83,
/// 0x00, 0x03, 0x43, 0x95, 0x4d, 0x60, 0x86, 0x83
/// ]);
///
/// assert_eq!(16947640962301618749969007319746179, reader.read_u128().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_u128(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadU128;
<span class="doccomment">/// Reads an signed 128-bit integer in big-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_i128(&amp;mut self) -&gt; io::Result&lt;i128&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read signed 128-bit big-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![
/// 0x80, 0, 0, 0, 0, 0, 0, 0,
/// 0, 0, 0, 0, 0, 0, 0, 0
/// ]);
///
/// assert_eq!(i128::MIN, reader.read_i128().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_i128(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadI128;
<span class="doccomment">/// Reads an 32-bit floating point type in big-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_f32(&amp;mut self) -&gt; io::Result&lt;f32&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read 32-bit floating point type from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![0xff, 0x7f, 0xff, 0xff]);
///
/// assert_eq!(f32::MIN, reader.read_f32().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_f32(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadF32;
<span class="doccomment">/// Reads an 64-bit floating point type in big-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_f64(&amp;mut self) -&gt; io::Result&lt;f64&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read 64-bit floating point type from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![
/// 0xff, 0xef, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
/// ]);
///
/// assert_eq!(f64::MIN, reader.read_f64().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_f64(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadF64;
<span class="doccomment">/// Reads an unsigned 16-bit integer in little-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_u16_le(&amp;mut self) -&gt; io::Result&lt;u16&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read unsigned 16 bit little-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![2, 5, 3, 0]);
///
/// assert_eq!(1282, reader.read_u16_le().await?);
/// assert_eq!(3, reader.read_u16_le().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_u16_le(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadU16Le;
<span class="doccomment">/// Reads a signed 16-bit integer in little-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_i16_le(&amp;mut self) -&gt; io::Result&lt;i16&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read signed 16 bit little-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![0x00, 0xc1, 0xff, 0x7c]);
///
/// assert_eq!(-16128, reader.read_i16_le().await?);
/// assert_eq!(31999, reader.read_i16_le().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_i16_le(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadI16Le;
<span class="doccomment">/// Reads an unsigned 32-bit integer in little-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_u32_le(&amp;mut self) -&gt; io::Result&lt;u32&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read unsigned 32-bit little-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![0x00, 0x00, 0x01, 0x0b]);
///
/// assert_eq!(184614912, reader.read_u32_le().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_u32_le(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadU32Le;
<span class="doccomment">/// Reads a signed 32-bit integer in little-endian order from the
/// underlying reader.
///
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_i32_le(&amp;mut self) -&gt; io::Result&lt;i32&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read signed 32-bit little-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![0xff, 0xff, 0x7a, 0x33]);
///
/// assert_eq!(863698943, reader.read_i32_le().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_i32_le(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadI32Le;
<span class="doccomment">/// Reads an unsigned 64-bit integer in little-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_u64_le(&amp;mut self) -&gt; io::Result&lt;u64&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read unsigned 64-bit little-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![
/// 0x00, 0x03, 0x43, 0x95, 0x4d, 0x60, 0x86, 0x83
/// ]);
///
/// assert_eq!(9477368352180732672, reader.read_u64_le().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_u64_le(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadU64Le;
<span class="doccomment">/// Reads an signed 64-bit integer in little-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_i64_le(&amp;mut self) -&gt; io::Result&lt;i64&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read signed 64-bit little-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![0x80, 0, 0, 0, 0, 0, 0, 0]);
///
/// assert_eq!(128, reader.read_i64_le().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_i64_le(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadI64Le;
<span class="doccomment">/// Reads an unsigned 128-bit integer in little-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_u128_le(&amp;mut self) -&gt; io::Result&lt;u128&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read unsigned 128-bit little-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![
/// 0x00, 0x03, 0x43, 0x95, 0x4d, 0x60, 0x86, 0x83,
/// 0x00, 0x03, 0x43, 0x95, 0x4d, 0x60, 0x86, 0x83
/// ]);
///
/// assert_eq!(174826588484952389081207917399662330624, reader.read_u128_le().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_u128_le(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadU128Le;
<span class="doccomment">/// Reads an signed 128-bit integer in little-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_i128_le(&amp;mut self) -&gt; io::Result&lt;i128&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read signed 128-bit little-endian integers from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![
/// 0x80, 0, 0, 0, 0, 0, 0, 0,
/// 0, 0, 0, 0, 0, 0, 0, 0
/// ]);
///
/// assert_eq!(128, reader.read_i128_le().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_i128_le(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadI128Le;
<span class="doccomment">/// Reads an 32-bit floating point type in little-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_f32_le(&amp;mut self) -&gt; io::Result&lt;f32&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read 32-bit floating point type from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![0xff, 0xff, 0x7f, 0xff]);
///
/// assert_eq!(f32::MIN, reader.read_f32_le().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_f32_le(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadF32Le;
<span class="doccomment">/// Reads an 64-bit floating point type in little-endian order from the
/// underlying reader.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_f64_le(&amp;mut self) -&gt; io::Result&lt;f64&gt;;
/// ```
///
/// It is recommended to use a buffered reader to avoid excessive
/// syscalls.
///
/// # Errors
///
/// This method returns the same errors as [`AsyncReadExt::read_exact`].
///
/// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact
///
/// # Examples
///
/// Read 64-bit floating point type from a `AsyncRead`:
///
/// ```rust
/// use tokio::io::{self, AsyncReadExt};
///
/// use std::io::Cursor;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut reader = Cursor::new(vec![
/// 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xef, 0xff
/// ]);
///
/// assert_eq!(f64::MIN, reader.read_f64_le().await?);
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>read_f64_le(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; ReadF64Le;
}
<span class="doccomment">/// Reads all bytes until EOF in this source, placing them into `buf`.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_to_end(&amp;mut self, buf: &amp;mut Vec&lt;u8&gt;) -&gt; io::Result&lt;usize&gt;;
/// ```
///
/// All bytes read from this source will be appended to the specified
/// buffer `buf`. This function will continuously call [`read()`] to
/// append more data to `buf` until [`read()`] returns `Ok(0)`.
///
/// If successful, the total number of bytes read is returned.
///
/// [`read()`]: AsyncReadExt::read
///
/// # Errors
///
/// If a read error is encountered then the `read_to_end` operation
/// immediately completes. Any bytes which have already been read will
/// be appended to `buf`.
///
/// # Examples
///
/// [`File`][crate::fs::File]s implement `Read`:
///
/// ```no_run
/// use tokio::io::{self, AsyncReadExt};
/// use tokio::fs::File;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut f = File::open(&quot;foo.txt&quot;).await?;
/// let mut buffer = Vec::new();
///
/// // read the whole file
/// f.read_to_end(&amp;mut buffer).await?;
/// Ok(())
/// }
/// ```
///
/// (See also the [`tokio::fs::read`] convenience function for reading from a
/// file.)
///
/// [`tokio::fs::read`]: fn@crate::fs::read
</span><span class="kw">fn </span>read_to_end&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span><span class="self">self</span>, buf: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>Vec&lt;u8&gt;) -&gt; ReadToEnd&lt;<span class="lifetime">&#39;a</span>, <span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Unpin,
{
read_to_end(<span class="self">self</span>, buf)
}
<span class="doccomment">/// Reads all bytes until EOF in this source, appending them to `buf`.
///
/// Equivalent to:
///
/// ```ignore
/// async fn read_to_string(&amp;mut self, buf: &amp;mut String) -&gt; io::Result&lt;usize&gt;;
/// ```
///
/// If successful, the number of bytes which were read and appended to
/// `buf` is returned.
///
/// # Errors
///
/// If the data in this stream is *not* valid UTF-8 then an error is
/// returned and `buf` is unchanged.
///
/// See [`read_to_end`][AsyncReadExt::read_to_end] for other error semantics.
///
/// # Examples
///
/// [`File`][crate::fs::File]s implement `Read`:
///
/// ```no_run
/// use tokio::io::{self, AsyncReadExt};
/// use tokio::fs::File;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let mut f = File::open(&quot;foo.txt&quot;).await?;
/// let mut buffer = String::new();
///
/// f.read_to_string(&amp;mut buffer).await?;
/// Ok(())
/// }
/// ```
///
/// (See also the [`crate::fs::read_to_string`] convenience function for
/// reading from a file.)
///
/// [`crate::fs::read_to_string`]: fn@crate::fs::read_to_string
</span><span class="kw">fn </span>read_to_string&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span><span class="self">self</span>, dst: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>String) -&gt; ReadToString&lt;<span class="lifetime">&#39;a</span>, <span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Unpin,
{
read_to_string(<span class="self">self</span>, dst)
}
<span class="doccomment">/// Creates an adaptor which reads at most `limit` bytes from it.
///
/// This function returns a new instance of `AsyncRead` which will read
/// at most `limit` bytes, after which it will always return EOF
/// (`Ok(0)`). Any read errors will not count towards the number of
/// bytes read and future calls to [`read()`] may succeed.
///
/// [`read()`]: fn@crate::io::AsyncReadExt::read
///
/// [read]: AsyncReadExt::read
///
/// # Examples
///
/// [`File`][crate::fs::File]s implement `Read`:
///
/// ```no_run
/// use tokio::io::{self, AsyncReadExt};
/// use tokio::fs::File;
///
/// #[tokio::main]
/// async fn main() -&gt; io::Result&lt;()&gt; {
/// let f = File::open(&quot;foo.txt&quot;).await?;
/// let mut buffer = [0; 5];
///
/// // read at most five bytes
/// let mut handle = f.take(5);
///
/// handle.read(&amp;mut buffer).await?;
/// Ok(())
/// }
/// ```
</span><span class="kw">fn </span>take(<span class="self">self</span>, limit: u64) -&gt; Take&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized,
{
take(<span class="self">self</span>, limit)
}
}
}
<span class="kw">impl</span>&lt;R: AsyncRead + <span class="question-mark">?</span>Sized&gt; AsyncReadExt <span class="kw">for </span>R {}
</code></pre></div>
</section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="tokio" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>