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<link title="Netsmtp" rel="Chapter" href="Netsmtp.html"><title>Ocamlnet 2 Reference Manual : Netstream</title>
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<center><h1>Module <a href="type_Netstream.html">Netstream</a></h1></center>
<br>
<pre><span class="keyword">module</span> Netstream: <code class="code">sig</code> <a href="Netstream.html">..</a> <code class="code">end</code></pre>A netstream is an input channel that is read block by block. The
fragment of the channel currently loaded into memory is called the
current window of the netstream. The window can be thought as
look-ahead buffer.
<p>
<b>Picture:</b>
<p>
<pre><code class="code"> 0 pos_in pos_in + window_length EOF
+------------------+-------------------+--------------------------+
====================
The current window
</code></pre>
<p>
You can use a netstream like an <code class="code">in_obj_channel</code>, and read characters
and strings from the stream. The bytes come first from the look-ahead
buffer, and if there are not enough bytes, they are loaded from the
underlying channel. After every read operation it is tried to enlarge
the window such that it contains at least one block.
<p>
If you want that the window becomes larger, you can call <code class="code">want</code> (to
enlarge the window to a certain size) or <code class="code">want_another_block</code> (to load
just another block from the underlying channel). Note that this affects only
the current window and not the future size of the window.
<p>
Note <code class="code">Buffer_underrun</code>: netstreams can cope with underruns of underlying
channels. An underrun happens when it is not possible to ensure the
minimum window size. However, it is possible that the window size
sinks under the minimum, but the <code class="code">Buffer_underrun</code> is deferred until the
next call of an input method. Furthermore, there is a problem in the <code class="code">skip</code>
method which may only be partially executed, i.e. the method skips some
bytes and then raises <code class="code">Buffer_underrun</code>.<br>
<hr width="100%">
<pre><span class="keyword">class type</span> <a name="TYPEin_obj_stream"></a><a href="Netstream.in_obj_stream.html">in_obj_stream</a> = <code class="code">object</code> <a href="Netstream.in_obj_stream.html">..</a> <code class="code">end</code></pre><div class="info">
An <code class="code">in_obj_stream</code> extends <code class="code">in_obj_channel</code> by look-ahead methods
</div>
<pre><span class="keyword">class</span> <a name="TYPEinput_stream"></a><a href="Netstream.input_stream.html">input_stream</a> : <code class="type">?len:int -> ?block_size:int -> <a href="Netchannels.in_obj_channel.html">Netchannels.in_obj_channel</a> -> </code><code class="type"><a href="Netstream.in_obj_stream.html">in_obj_stream</a></code></pre><div class="info">
Make an <code class="code">in_obj_stream</code> on top of an <code class="code">in_obj_channel</code>.
</div>
<pre><span class="keyword">class</span> <a name="TYPEsub_stream"></a><a href="Netstream.sub_stream.html">sub_stream</a> : <code class="type">?len:int -> ?delimiter:string -> <a href="Netstream.in_obj_stream.html">in_obj_stream</a> -> </code><code class="type"><a href="Netstream.in_obj_stream.html">in_obj_stream</a></code></pre><div class="info">
A sub stream is the part of the whole stream from the current position
to an arbitrary other position that is determined by <code class="code">len</code> and
<code class="code">delimiter</code>.
</div>
<pre><span class="keyword">val</span> <a name="VALprint_in_obj_stream"></a>print_in_obj_stream : <code class="type">Format.formatter -> <a href="Netstream.in_obj_stream.html">in_obj_stream</a> -> unit</code></pre><div class="info">
A top-loop printer for streams<br>
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