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<p class='location'>Trait UdpCodec</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.In">In</a><a href="#associatedtype.Out">Out</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.decode">decode</a><a href="#tymethod.encode">encode</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>tokio_core</a>::<wbr><a href='index.html'>net</a></p><script>window.sidebarCurrent = {name: 'UdpCodec', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Trait <a href='../index.html'>tokio_core</a>::<wbr><a href='index.html'>net</a>::<wbr><a class="trait" href=''>UdpCodec</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../../src/tokio_core/net/udp/frame.rs.html#22-51' title='goto source code'>[src]</a></span></h1>
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<pre class='rust trait'>pub trait UdpCodec {
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type <a href='#associatedtype.In' class="type">In</a>;
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type <a href='#associatedtype.Out' class="type">Out</a>;
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fn <a href='#tymethod.decode' class='fnname'>decode</a>(&mut self, src: &<a class="enum" href="https://doc.rust-lang.org/nightly/std/net/addr/enum.SocketAddr.html" title="enum std::net::addr::SocketAddr">SocketAddr</a>, buf: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><Self::<a class="type" href="../../tokio_core/net/trait.UdpCodec.html#associatedtype.In" title="type tokio_core::net::UdpCodec::In">In</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.encode' class='fnname'>encode</a>(&mut self, msg: Self::<a class="type" href="../../tokio_core/net/trait.UdpCodec.html#associatedtype.Out" title="type tokio_core::net::UdpCodec::Out">Out</a>, buf: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/std/net/addr/enum.SocketAddr.html" title="enum std::net::addr::SocketAddr">SocketAddr</a>;
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}</pre><div class='docblock'><p>Encoding of frames via buffers.</p>
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<p>This trait is used when constructing an instance of <code>UdpFramed</code> and provides
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the <code>In</code> and <code>Out</code> types which are decoded and encoded from the socket,
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respectively.</p>
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<p>Because UDP is a connectionless protocol, the <code>decode</code> method receives the
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address where data came from and the <code>encode</code> method is also responsible for
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determining the remote host to which the datagram should be sent</p>
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<p>The trait itself is implemented on a type that can track state for decoding
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or encoding, which is particularly useful for streaming parsers. In many
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cases, though, this type will simply be a unit struct (e.g. <code>struct HttpCodec</code>).</p>
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<h3 id='associatedtype.In' class='method'><span id='In.t' class='invisible'><code>type <a href='#associatedtype.In' class="type">In</a></code></span></h3><div class='docblock'><p>The type of decoded frames.</p>
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</div><h3 id='associatedtype.Out' class='method'><span id='Out.t' class='invisible'><code>type <a href='#associatedtype.Out' class="type">Out</a></code></span></h3><div class='docblock'><p>The type of frames to be encoded.</p>
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<h3 id='tymethod.decode' class='method'><span id='decode.v' class='invisible'><code>fn <a href='#tymethod.decode' class='fnname'>decode</a>(&mut self, src: &<a class="enum" href="https://doc.rust-lang.org/nightly/std/net/addr/enum.SocketAddr.html" title="enum std::net::addr::SocketAddr">SocketAddr</a>, buf: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><Self::<a class="type" href="../../tokio_core/net/trait.UdpCodec.html#associatedtype.In" title="type tokio_core::net::UdpCodec::In">In</a>></code></span></h3><div class='docblock'><p>Attempts to decode a frame from the provided buffer of bytes.</p>
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<p>This method is called by <code>UdpFramed</code> on a single datagram which has been
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read from a socket. The <code>buf</code> argument contains the data that was
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received from the remote address, and <code>src</code> is the address the data came
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from. Note that typically this method should require the entire contents
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of <code>buf</code> to be valid or otherwise return an error with trailing data.</p>
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<p>Finally, if the bytes in the buffer are malformed then an error is
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returned indicating why. This informs <code>Framed</code> that the stream is now
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corrupt and should be terminated.</p>
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</div><h3 id='tymethod.encode' class='method'><span id='encode.v' class='invisible'><code>fn <a href='#tymethod.encode' class='fnname'>encode</a>(&mut self, msg: Self::<a class="type" href="../../tokio_core/net/trait.UdpCodec.html#associatedtype.Out" title="type tokio_core::net::UdpCodec::Out">Out</a>, buf: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/std/net/addr/enum.SocketAddr.html" title="enum std::net::addr::SocketAddr">SocketAddr</a></code></span></h3><div class='docblock'><p>Encodes a frame into the buffer provided.</p>
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<p>This method will encode <code>msg</code> into the byte buffer provided by <code>buf</code>.
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The <code>buf</code> provided is an internal buffer of the <code>Framed</code> instance and
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will be written out when possible.</p>
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<p>The encode method also determines the destination to which the buffer
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should be directed, which will be returned as a <code>SocketAddr</code>.</p>
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