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<link title="Get" rel="Chapter" href="Get.html"><title>Ocamlnet 4 Reference Manual : Netchannels.pipe</title>
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<h1>Class <a href="type_Netchannels.pipe.html">Netchannels.pipe</a></h1>
<pre><span id="TYPEpipe"><span class="keyword">class</span> pipe</span> : <code class="type">?conv:<a href="Netbuffer.html#TYPEt">Netbuffer.t</a> -> bool -> <a href="Netbuffer.html#TYPEt">Netbuffer.t</a> -> unit -> ?buffer_size:int -> unit -> </code><code class="type"><a href="Netchannels.io_obj_channel-c.html">io_obj_channel</a></code></pre><div class="info class top">
<div class="info-desc">
<p>A <code class="code">pipe</code> has two internal buffers (realized by Netbuffer). The
output methods of the class write to the incoming buffer. When
new data are appended to the incoming buffer, the conversion function
<code class="code">conv</code> is called; the arguments are the incoming buffer and the outgoing
buffer. The conversion function must convert the data available in the
incoming buffer and append the result to the outgoing buffer. Finally,
the input methods of the class return the data found in the outgoing
buffer.</p>
<p>The conversion function is called as follows:
<code class="code">conv incoming_buffer at_eof outgoing_buffer</code></p>
<p>The conversion function is allowed to do nothing if the incoming data
are not complete enough to be converted. It is also allowed to convert
only the beginning of the incoming buffer.</p>
<p>If the outgoing buffer is empty, the input methods will raise
<code class="code">Buffer_underrun</code>.</p>
<p>If <code class="code">close_out</code> is invoked, the end of the data stream will be recorded.
In this case, the conversion function is called with <code class="code">at_eof = true</code>,
and it is expected that this function converts the whole data found
in the incoming buffer.</p>
<p><code class="code">close_in</code> implies <code class="code">close_out</code>.</p>
<p>The conversion function may raise exceptions. The exceptions will
fall through to the caller of the input methods. (The output methods
and <code class="code">close_in</code>, <code class="code">close_out</code> never fail because of such exceptions.)</p>
<p>The default conversion function copies everything from the incoming
buffer to the outgoing buffer without modification.</p>
</div>
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