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<link title="Get" rel="Chapter" href="Get.html"><link title="Extracting strings" rel="Section" href="#2_Extractingstrings">
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<title>Ocamlnet 4 Reference Manual : Netbuffer</title>
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<h1>Module <a href="type_Netbuffer.html">Netbuffer</a></h1>
<pre><span id="MODULENetbuffer"><span class="keyword">module</span> Netbuffer</span>: <code class="code">sig</code> <a href="Netbuffer.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="info-desc">
<p>A Netbuffer.t is a buffer that can grow and shrink dynamically.</p>
</div>
</div>
<hr width="100%">
<pre><span id="TYPEt"><span class="keyword">type</span> <code class="type"></code>t</span> </pre>
<pre><span id="VALcreate"><span class="keyword">val</span> create</span> : <code class="type">int -> <a href="Netbuffer.html#TYPEt">t</a></code></pre><div class="info ">
<div class="info-desc">
<p>Creates a netbuffer which allocates initially this number of bytes.
The logical length is zero.</p>
</div>
</div>
<pre><span id="VALcontents"><span class="keyword">val</span> contents</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> string</code></pre><div class="info ">
<div class="info-desc">
<p>Returns the contents of the buffer as fresh string.</p>
</div>
</div>
<pre><span id="VALto_bytes"><span class="keyword">val</span> to_bytes</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> Stdlib.Bytes.t</code></pre><div class="info ">
<div class="info-desc">
<p>Returns the contents of the buffer as fresh string.</p>
</div>
</div>
<pre><span id="VALto_tstring_poly"><span class="keyword">val</span> to_tstring_poly</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> 's <a href="Netstring_tstring.html#TYPEtstring_kind">Netstring_tstring.tstring_kind</a> -> 's</code></pre><div class="info ">
<div class="info-desc">
<p>Return the buffer in the format as selected by the arg</p>
</div>
</div>
<pre><span id="VALto_tstring"><span class="keyword">val</span> to_tstring</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> 'a <a href="Netstring_tstring.html#TYPEtstring_kind">Netstring_tstring.tstring_kind</a> -> <a href="Netsys_types.html#TYPEtstring">Netsys_types.tstring</a></code></pre><div class="info ">
<div class="info-desc">
<p>Returns the buffer as tagged string, selecting the chosen representation</p>
</div>
</div>
<pre><span id="VALlength"><span class="keyword">val</span> length</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int</code></pre><div class="info ">
<div class="info-desc">
<p>Returns the logical length of the buffer</p>
</div>
</div>
<h3 id="2_Extractingstrings">Extracting strings</h3>
<pre><span id="VALget"><span class="keyword">val</span> get</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> char</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">get nb pos</code>: Get the character at <code class="code">pos</code></p>
</div>
</div>
<pre><span id="VALnth"><span class="keyword">val</span> nth</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> char</code></pre><div class="info ">
<div class="info-desc">
<p>Alias for <code class="code">get</code></p>
</div>
</div>
<pre><span id="VALsub"><span class="keyword">val</span> sub</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> int -> string</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">sub nb k n</code>: returns the n characters starting at position <code class="code">n</code> from
netbuffer <code class="code">nb</code> as fresh string</p>
</div>
</div>
<pre><span id="VALsub_bytes"><span class="keyword">val</span> sub_bytes</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> int -> Stdlib.Bytes.t</code></pre><div class="info ">
<div class="info-desc">
<p>Same for bytes</p>
</div>
</div>
<h3 id="2_Extractionwithblit">Extraction with blit</h3>
<pre><span id="VALblit_to_bytes"><span class="keyword">val</span> blit_to_bytes</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> Stdlib.Bytes.t -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">blit_to_bytes nb srcpos dest destpos len</code>: Copies the <code class="code">len</code> bytes at
position <code class="code">srcpos</code> from <code class="code">nb</code> to the string <code class="code">dest</code> at position <code class="code">destpos</code>.</p>
</div>
</div>
<pre><span id="VALblit_to_string"><span class="keyword">val</span> blit_to_string</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> Stdlib.Bytes.t -> int -> int -> unit</code></pre><div class="info ">
<div class="info-deprecated">
<span class="warning">Deprecated.</span>"Use blit_to_bytes instead."</div>
</div>
<pre><span id="VALblit"><span class="keyword">val</span> blit</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> Stdlib.Bytes.t -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Compatibility name for <code class="code">blit_to_bytes</code></p>
</div>
</div>
<pre><span id="VALblit_to_memory"><span class="keyword">val</span> blit_to_memory</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> <a href="Netsys_mem.html#TYPEmemory">Netsys_mem.memory</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">blit_to_memory nb srcpos dest destpos len</code>: Copies the <code class="code">len</code> bytes at
position <code class="code">srcpos</code> from <code class="code">nb</code> to the membuffer <code class="code">dest</code> at position
<code class="code">destpos</code>.</p>
</div>
</div>
<pre><span id="VALblit_to_tbuffer"><span class="keyword">val</span> blit_to_tbuffer</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> <a href="Netsys_types.html#TYPEtbuffer">Netsys_types.tbuffer</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Blits to a tagged buffer</p>
</div>
</div>
<h3 id="2_Appendingstrings">Appending strings</h3>
<pre><span id="VALadd_string"><span class="keyword">val</span> add_string</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> string -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_string nb s</code>: Adds a copy of the string <code class="code">s</code> to the logical end of
the netbuffer <code class="code">nb</code>. If necessary, <code class="code">nb</code> grows.</p>
</div>
</div>
<pre><span id="VALadd_bytes"><span class="keyword">val</span> add_bytes</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> Stdlib.Bytes.t -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Same for bytes</p>
</div>
</div>
<pre><span id="VALadd_tstring"><span class="keyword">val</span> add_tstring</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> <a href="Netsys_types.html#TYPEtstring">Netsys_types.tstring</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Same for tagged string</p>
</div>
</div>
<pre><span id="VALadd_tstring_poly"><span class="keyword">val</span> add_tstring_poly</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> 's <a href="Netstring_tstring.html#TYPEtstring_ops">Netstring_tstring.tstring_ops</a> -> 's -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Polymorphic version</p>
</div>
</div>
<pre><span id="VALadd_substring"><span class="keyword">val</span> add_substring</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> string -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_substring nb s k n</code>: Adds the substring of <code class="code">s</code> starting at position
<code class="code">k</code> with length <code class="code">n</code> to the logical end of the netbuffer <code class="code">nb</code>. If necessary,
<code class="code">nb</code> grows.</p>
<p>This is semantically the same as
<code class="code">add_string nb (String.sub s k n)</code>, but the extra copy is avoided.</p>
</div>
</div>
<pre><span id="VALadd_subbytes"><span class="keyword">val</span> add_subbytes</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> Stdlib.Bytes.t -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Same for bytes</p>
</div>
</div>
<pre><span id="VALadd_subtstring"><span class="keyword">val</span> add_subtstring</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> <a href="Netsys_types.html#TYPEtstring">Netsys_types.tstring</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Same for tagged string</p>
</div>
</div>
<pre><span id="VALadd_sub_string"><span class="keyword">val</span> add_sub_string</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> string -> int -> int -> unit</code></pre><div class="info ">
<div class="info-deprecated">
<span class="warning">Deprecated.</span>"Use add_substring instead."</div>
</div>
<pre><span id="VALadd_submemory"><span class="keyword">val</span> add_submemory</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> <a href="Netsys_mem.html#TYPEmemory">Netsys_mem.memory</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Same as <code class="code">add_substring</code>, but gets data from a memory buffer</p>
</div>
</div>
<pre><span id="VALadd_sub_memory"><span class="keyword">val</span> add_sub_memory</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> <a href="Netsys_mem.html#TYPEmemory">Netsys_mem.memory</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-deprecated">
<span class="warning">Deprecated.</span>"Use add_submemory instead."</div>
</div>
<pre><span id="VALadd_subtstring_poly"><span class="keyword">val</span> add_subtstring_poly</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> 's <a href="Netstring_tstring.html#TYPEtstring_ops">Netstring_tstring.tstring_ops</a> -> 's -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Polymorphic version</p>
</div>
</div>
<pre><span id="VALadd_char"><span class="keyword">val</span> add_char</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> char -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_char nb c</code>: Adds a single char at the end of the buffer</p>
</div>
</div>
<pre><span id="VALadd_char_2"><span class="keyword">val</span> add_char_2</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> char -> char -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_char_2 nb c1 c2</code>: Adds two chars at the end of the buffer</p>
</div>
</div>
<pre><span id="VALadd_char_4"><span class="keyword">val</span> add_char_4</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> char -> char -> char -> char -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_char_4 nb c1 c2 c3 c4</code>: Adds four chars at the end of the buffer</p>
</div>
</div>
<pre><span id="VALadd_inplace"><span class="keyword">val</span> add_inplace</span> : <code class="type">?len:int -> <a href="Netbuffer.html#TYPEt">t</a> -> (Stdlib.Bytes.t -> int -> int -> int) -> int</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_inplace nb f</code>: Calls the function <code class="code">f</code> to add bytes to the
netbuffer <code class="code">nb</code>. The arguments of <code class="code">f</code> are the buffer, the position
in the buffer, and the maximum length. The function <code class="code">f</code> must return
the actual number of added bytes; this number is also returned by
<code class="code">add_inplace</code>.</p>
<p>Example: let n = add_inplace nb (Pervasives.input ch)</p>
<p>The argument <code class="code">len</code> is the number of bytes to add (second argument of
<code class="code">f</code>). It defaults to the number of free bytes in the buffer after space
for at least one byte has been allocated.</p>
</div>
</div>
<pre><span id="VALadd_buffer"><span class="keyword">val</span> add_buffer</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> <a href="Netbuffer.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_buffer nb1 nb2</code>: Adds the contents of <code class="code">nb2</code> to the end of <code class="code">nb1</code></p>
</div>
</div>
<pre><span id="VALarea_for_additions"><span class="keyword">val</span> area_for_additions</span> : <code class="type">?len:int -> <a href="Netbuffer.html#TYPEt">t</a> -> Stdlib.Bytes.t * int * int</code></pre>
<pre><span id="VALadvance"><span class="keyword">val</span> advance</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>These two functions work together, so that the effect of <code class="code">add_inplace</code>
can be obtained in two steps. First, the user calls</p>
<pre class="codepre"><code class="code"> let (s,pos,len) = area_for_additions nb
</code></pre><p>to get the area where to put new data of length <code class="code">n</code>, with <code class="code">n <= len</code>.
After this the data is made valid by</p>
<pre class="codepre"><code class="code"> advance n
</code></pre></div>
</div>
<h3 id="2_Insertingstrings">Inserting strings</h3>
<pre><span id="VALinsert_string"><span class="keyword">val</span> insert_string</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> string -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">insert_string nb p s</code>: Inserts the value of string <code class="code">s</code> at position
<code class="code">p</code> into the netbuffer <code class="code">nb</code></p>
</div>
</div>
<pre><span id="VALinsert_substring"><span class="keyword">val</span> insert_substring</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> string -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">insert_string nb p s k n</code>: Inserts a substring of string <code class="code">s</code> at position
<code class="code">p</code> into the netbuffer <code class="code">nb</code>. The substring is denoted by position <code class="code">k</code>
and has length <code class="code">n</code></p>
</div>
</div>
<pre><span id="VALinsert_sub_string"><span class="keyword">val</span> insert_sub_string</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> string -> int -> int -> unit</code></pre><div class="info ">
<div class="info-deprecated">
<span class="warning">Deprecated.</span>"Use insert_substring instead."</div>
</div>
<pre><span id="VALinsert_subbytes"><span class="keyword">val</span> insert_subbytes</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> Stdlib.Bytes.t -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Same for bytes</p>
</div>
</div>
<pre><span id="VALinsert_subtstring"><span class="keyword">val</span> insert_subtstring</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> <a href="Netsys_types.html#TYPEtstring">Netsys_types.tstring</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Same for tagged string</p>
</div>
</div>
<pre><span id="VALinsert_submemory"><span class="keyword">val</span> insert_submemory</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> <a href="Netsys_types.html#TYPEmemory">Netsys_types.memory</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Same for memory</p>
</div>
</div>
<pre><span id="VALinsert_char"><span class="keyword">val</span> insert_char</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> char -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">insert_char nb p c</code>: Inserts character <code class="code">c</code> at position <code class="code">p</code> into
the netbuffer <code class="code">nb</code></p>
</div>
</div>
<h3 id="2_Overwritingstrings">Overwriting strings</h3>
<pre><span id="VALset"><span class="keyword">val</span> set</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> char -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">set nb pos c</code>: Sets the character at <code class="code">pos</code> to <code class="code">c</code></p>
</div>
</div>
<pre><span id="VALput_string"><span class="keyword">val</span> put_string</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> string -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">put_string nb pos s</code>: Copies the string <code class="code">s</code> to the position <code class="code">pos</code>
of netbuffer <code class="code">nb</code></p>
</div>
</div>
<pre><span id="VALblit_from_string"><span class="keyword">val</span> blit_from_string</span> : <code class="type">string -> int -> <a href="Netbuffer.html#TYPEt">t</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">blit_from_string src srcpos dest destpos len</code>: Copies the <code class="code">len</code> bytes
at position <code class="code">srcpos</code> from the string <code class="code">src</code> to the netbuffer <code class="code">dest</code> at
position <code class="code">destpos</code>.</p>
<p>It is possible to copy the string beyond the end of the buffer. The
buffer is automatically enlarged in this case.</p>
</div>
</div>
<pre><span id="VALblit_from_bytes"><span class="keyword">val</span> blit_from_bytes</span> : <code class="type">Stdlib.Bytes.t -> int -> <a href="Netbuffer.html#TYPEt">t</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Same for bytes</p>
</div>
</div>
<pre><span id="VALblit_from_memory"><span class="keyword">val</span> blit_from_memory</span> : <code class="type"><a href="Netsys_types.html#TYPEmemory">Netsys_types.memory</a> -> int -> <a href="Netbuffer.html#TYPEt">t</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Same for memory</p>
</div>
</div>
<pre><span id="VALblit_from_tstring"><span class="keyword">val</span> blit_from_tstring</span> : <code class="type"><a href="Netsys_types.html#TYPEtstring">Netsys_types.tstring</a> -> int -> <a href="Netbuffer.html#TYPEt">t</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Same for tagged string</p>
</div>
</div>
<h3 id="2_Deleting">Deleting</h3>
<pre><span id="VALdelete"><span class="keyword">val</span> delete</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">delete nb k n</code>: Deletes the <code class="code">n</code> bytes at position <code class="code">k</code> of netbuffer
<code class="code">nb</code> in-place.</p>
<p>The netbuffer does not shrink, however, i.e. the free space is not
given back to the memory manager.</p>
</div>
</div>
<pre><span id="VALclear"><span class="keyword">val</span> clear</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Deletes all contents from the buffer. As <code class="code">delete</code>, the netbuffer does
not shrink.</p>
</div>
</div>
<pre><span id="VALreset"><span class="keyword">val</span> reset</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Empty the buffer, deallocate the internal string, and replace it
with a new string of length <code class="code">n</code> that was allocated by
<a href="Netbuffer.html#VALcreate"><code class="code">Netbuffer.create</code></a> <code class="code">n</code>.</p>
</div>
</div>
<pre><span id="VALtry_shrinking"><span class="keyword">val</span> try_shrinking</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">try_shrinking nb</code>: If the length of the buffer is less than half of
the allocated space, the netbuffer is reallocated in order to save
memory.</p>
</div>
</div>
<h3 id="2_Searching">Searching</h3>
<pre><span id="VALindex_from"><span class="keyword">val</span> index_from</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> int -> char -> int</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">index_from nb k c</code>: Searches the character <code class="code">c</code> in the netbuffer beginning
at position <code class="code">k</code>. If found, the position of the left-most occurence is
returned. Otherwise, <code class="code">Not_found</code> is raised.</p>
</div>
</div>
<h3 id="2_Miscelleneous">Miscelleneous</h3>
<pre><span id="VALunsafe_buffer"><span class="keyword">val</span> unsafe_buffer</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> Stdlib.Bytes.t</code></pre><div class="info ">
<div class="info-desc">
<p><b>Warning! This is a low-level function!</b>
Returns the current string that internally holds the buffer.
The byte positions 0 to length - 1 actually store the contents of
the buffer. You can directly read and modify the buffer. Note that
there is no protection if you read or write positions beyond the
length of the buffer.</p>
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<pre><span id="VALprint_buffer"><span class="keyword">val</span> print_buffer</span> : <code class="type"><a href="Netbuffer.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
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<p>For the toploop</p>
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