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<title>Stdlib.Buffer</title>
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<h1>Module <a href="type_Stdlib.Buffer.html">Stdlib.Buffer</a></h1>

<pre><span id="MODULEBuffer"><span class="keyword">module</span> Buffer</span>: <code class="type"><a href="Buffer.html">Buffer</a></code></pre><hr width="100%">

<pre><span id="TYPEt"><span class="keyword">type</span> <code class="type"></code>t</span> </pre>
<div class="info ">
<div class="info-desc">
<p>The abstract type of buffers.</p>
</div>
</div>


<pre><span id="VALcreate"><span class="keyword">val</span> create</span> : <code class="type">int -> <a href="Buffer.html#TYPEt">t</a></code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">create&nbsp;n</code> returns a fresh buffer, initially empty.
   The <code class="code">n</code> parameter is the initial size of the internal byte sequence
   that holds the buffer contents. That byte sequence is automatically
   reallocated when more than <code class="code">n</code> characters are stored in the buffer,
   but shrinks back to <code class="code">n</code> characters when <code class="code">reset</code> is called.
   For best performance, <code class="code">n</code> should be of the same order of magnitude
   as the number of characters that are expected to be stored in
   the buffer (for instance, 80 for a buffer that holds one output
   line).  Nothing bad will happen if the buffer grows beyond that
   limit, however. In doubt, take <code class="code">n&nbsp;=&nbsp;16</code> for instance.
   If <code class="code">n</code> is not between 1 and <a href="Sys.html#VALmax_string_length"><code class="code"><span class="constructor">Sys</span>.max_string_length</code></a>, it will
   be clipped to that interval.</p>
</div>
</div>

<pre><span id="VALcontents"><span class="keyword">val</span> contents</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> string</code></pre><div class="info ">
<div class="info-desc">
<p>Return a copy of the current contents of the buffer.
    The buffer itself is unchanged.</p>
</div>
</div>

<pre><span id="VALto_bytes"><span class="keyword">val</span> to_bytes</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> bytes</code></pre><div class="info ">
<div class="info-desc">
<p>Return a copy of the current contents of the buffer.
    The buffer itself is unchanged.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.02</li>
</ul>
</div>

<pre><span id="VALsub"><span class="keyword">val</span> sub</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> int -> string</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code"><span class="constructor">Buffer</span>.sub&nbsp;b&nbsp;off&nbsp;len</code> returns a copy of <code class="code">len</code> bytes from the
    current contents of the buffer <code class="code">b</code>, starting at offset <code class="code">off</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Raises</b> <code>Invalid_argument</code> if <code class="code">srcoff</code> and <code class="code">len</code> do not designate a valid
    range of <code class="code">b</code>.</li>
</ul>
</div>

<pre><span id="VALblit"><span class="keyword">val</span> blit</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> bytes -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code"><span class="constructor">Buffer</span>.blit&nbsp;src&nbsp;srcoff&nbsp;dst&nbsp;dstoff&nbsp;len</code> copies <code class="code">len</code> characters from
   the current contents of the buffer <code class="code">src</code>, starting at offset <code class="code">srcoff</code>
   to <code class="code">dst</code>, starting at character <code class="code">dstoff</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 3.11.2</li>
<li><b>Raises</b> <code>Invalid_argument</code> if <code class="code">srcoff</code> and <code class="code">len</code> do not designate a valid
   range of <code class="code">src</code>, or if <code class="code">dstoff</code> and <code class="code">len</code> do not designate a valid
   range of <code class="code">dst</code>.</li>
</ul>
</div>

<pre><span id="VALnth"><span class="keyword">val</span> nth</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> char</code></pre><div class="info ">
<div class="info-desc">
<p>Get the n-th character of the buffer.</p>
</div>
<ul class="info-attributes">
<li><b>Raises</b> <code>Invalid_argument</code> if
    index out of bounds</li>
</ul>
</div>

<pre><span id="VALlength"><span class="keyword">val</span> length</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int</code></pre><div class="info ">
<div class="info-desc">
<p>Return the number of characters currently contained in the buffer.</p>
</div>
</div>

<pre><span id="VALclear"><span class="keyword">val</span> clear</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Empty the buffer.</p>
</div>
</div>

<pre><span id="VALreset"><span class="keyword">val</span> reset</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Empty the buffer and deallocate the internal byte sequence holding the
   buffer contents, replacing it with the initial internal byte sequence
   of length <code class="code">n</code> that was allocated by <a href="Buffer.html#VALcreate"><code class="code"><span class="constructor">Buffer</span>.create</code></a> <code class="code">n</code>.
   For long-lived buffers that may have grown a lot, <code class="code">reset</code> allows
   faster reclamation of the space used by the buffer.</p>
</div>
</div>

<pre><span id="VALadd_char"><span class="keyword">val</span> add_char</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> char -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_char&nbsp;b&nbsp;c</code> appends the character <code class="code">c</code> at the end of buffer <code class="code">b</code>.</p>
</div>
</div>

<pre><span id="VALadd_utf_8_uchar"><span class="keyword">val</span> add_utf_8_uchar</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> <a href="Uchar.html#TYPEt">Uchar.t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_utf_8_uchar&nbsp;b&nbsp;u</code> appends the <a href="https://tools.ietf.org/html/rfc3629">
    UTF-8</a> encoding of <code class="code">u</code> at the end of buffer <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.06.0</li>
</ul>
</div>

<pre><span id="VALadd_utf_16le_uchar"><span class="keyword">val</span> add_utf_16le_uchar</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> <a href="Uchar.html#TYPEt">Uchar.t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_utf_16le_uchar&nbsp;b&nbsp;u</code> appends the
    <a href="https://tools.ietf.org/html/rfc2781">UTF-16LE</a> encoding of <code class="code">u</code>
    at the end of buffer <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.06.0</li>
</ul>
</div>

<pre><span id="VALadd_utf_16be_uchar"><span class="keyword">val</span> add_utf_16be_uchar</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> <a href="Uchar.html#TYPEt">Uchar.t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_utf_16be_uchar&nbsp;b&nbsp;u</code> appends the
    <a href="https://tools.ietf.org/html/rfc2781">UTF-16BE</a> encoding of <code class="code">u</code>
    at the end of buffer <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.06.0</li>
</ul>
</div>

<pre><span id="VALadd_string"><span class="keyword">val</span> add_string</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> string -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_string&nbsp;b&nbsp;s</code> appends the string <code class="code">s</code> at the end of buffer <code class="code">b</code>.</p>
</div>
</div>

<pre><span id="VALadd_bytes"><span class="keyword">val</span> add_bytes</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> bytes -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_bytes&nbsp;b&nbsp;s</code> appends the byte sequence <code class="code">s</code> at the end of buffer <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.02</li>
</ul>
</div>

<pre><span id="VALadd_substring"><span class="keyword">val</span> add_substring</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> string -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_substring&nbsp;b&nbsp;s&nbsp;ofs&nbsp;len</code> takes <code class="code">len</code> characters from offset
   <code class="code">ofs</code> in string <code class="code">s</code> and appends them at the end of buffer <code class="code">b</code>.</p>
</div>
</div>

<pre><span id="VALadd_subbytes"><span class="keyword">val</span> add_subbytes</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> bytes -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_subbytes&nbsp;b&nbsp;s&nbsp;ofs&nbsp;len</code> takes <code class="code">len</code> characters from offset
    <code class="code">ofs</code> in byte sequence <code class="code">s</code> and appends them at the end of buffer <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.02</li>
</ul>
</div>

<pre><span id="VALadd_substitute"><span class="keyword">val</span> add_substitute</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> (string -> string) -> string -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_substitute&nbsp;b&nbsp;f&nbsp;s</code> appends the string pattern <code class="code">s</code> at the end
   of buffer <code class="code">b</code> with substitution.
   The substitution process looks for variables into
   the pattern and substitutes each variable name by its value, as
   obtained by applying the mapping <code class="code">f</code> to the variable name. Inside the
   string pattern, a variable name immediately follows a non-escaped
   <code class="code">$</code> character and is one of the following:</p>
<ul>
<li>a non empty sequence of alphanumeric or <code class="code">_</code> characters,</li>
<li>an arbitrary sequence of characters enclosed by a pair of
   matching parentheses or curly brackets.
   An escaped <code class="code">$</code> character is a <code class="code">$</code> that immediately follows a backslash
   character; it then stands for a plain <code class="code">$</code>.</li>
</ul>
</div>
<ul class="info-attributes">
<li><b>Raises</b> <code>Not_found</code> if the closing character of a parenthesized variable
   cannot be found.</li>
</ul>
</div>

<pre><span id="VALadd_buffer"><span class="keyword">val</span> add_buffer</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> <a href="Buffer.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_buffer&nbsp;b1&nbsp;b2</code> appends the current contents of buffer <code class="code">b2</code>
   at the end of buffer <code class="code">b1</code>.  <code class="code">b2</code> is not modified.</p>
</div>
</div>

<pre><span id="VALadd_channel"><span class="keyword">val</span> add_channel</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> <a href="Stdlib.html#TYPEin_channel">in_channel</a> -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_channel&nbsp;b&nbsp;ic&nbsp;n</code> reads at most <code class="code">n</code> characters from the
   input channel <code class="code">ic</code> and stores them at the end of buffer <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Raises</b> <code>End_of_file</code> if the channel contains fewer than <code class="code">n</code>
   characters. In this case, the characters are still added to
   the buffer, so as to avoid loss of data.</li>
</ul>
</div>

<pre><span id="VALoutput_buffer"><span class="keyword">val</span> output_buffer</span> : <code class="type"><a href="Stdlib.html#TYPEout_channel">out_channel</a> -> <a href="Buffer.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">output_buffer&nbsp;oc&nbsp;b</code> writes the current contents of buffer <code class="code">b</code>
   on the output channel <code class="code">oc</code>.</p>
</div>
</div>

<pre><span id="VALtruncate"><span class="keyword">val</span> truncate</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">truncate&nbsp;b&nbsp;len</code> truncates the length of <code class="code">b</code> to <code class="code">len</code>
  Note: the internal byte sequence is not shortened.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.05.0</li>
<li><b>Raises</b> <code>Invalid_argument</code> if <code class="code">len&nbsp;&lt;&nbsp;0</code> or <code class="code">len&nbsp;&gt;&nbsp;length&nbsp;b</code>.</li>
</ul>
</div>
<h2 id="1_Iterators">Iterators</h2>
<pre><span id="VALto_seq"><span class="keyword">val</span> to_seq</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> char <a href="Seq.html#TYPEt">Seq.t</a></code></pre><div class="info ">
<div class="info-desc">
<p>Iterate on the buffer, in increasing order.
    Modification of the buffer during iteration is undefined behavior.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.07</li>
</ul>
</div>

<pre><span id="VALto_seqi"><span class="keyword">val</span> to_seqi</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> (int * char) <a href="Seq.html#TYPEt">Seq.t</a></code></pre><div class="info ">
<div class="info-desc">
<p>Iterate on the buffer, in increasing order, yielding indices along chars.
    Modification of the buffer during iteration is undefined behavior.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.07</li>
</ul>
</div>

<pre><span id="VALadd_seq"><span class="keyword">val</span> add_seq</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> char <a href="Seq.html#TYPEt">Seq.t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Add chars to the buffer</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.07</li>
</ul>
</div>

<pre><span id="VALof_seq"><span class="keyword">val</span> of_seq</span> : <code class="type">char <a href="Seq.html#TYPEt">Seq.t</a> -> <a href="Buffer.html#TYPEt">t</a></code></pre><div class="info ">
<div class="info-desc">
<p>Create a buffer from the generator</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.07</li>
</ul>
</div>
<h2 id="1_Binaryencodingofintegers">Binary encoding of integers</h2><p>The functions in this section append binary encodings of integers
    to buffers.</p>

<p>Little-endian (resp. big-endian) encoding means that least
    (resp. most) significant bytes are stored first.  Big-endian is
    also known as network byte order.  Native-endian encoding is
    either little-endian or big-endian depending on <a href="Sys.html#VALbig_endian"><code class="code"><span class="constructor">Sys</span>.big_endian</code></a>.</p>

<p>32-bit and 64-bit integers are represented by the <code class="code">int32</code> and
    <code class="code">int64</code> types, which can be interpreted either as signed or
    unsigned numbers.</p>

<p>8-bit and 16-bit integers are represented by the <code class="code">int</code> type,
    which has more bits than the binary encoding.  Functions that
    encode these values truncate their inputs to their least
    significant bytes.</p>

<pre><span id="VALadd_uint8"><span class="keyword">val</span> add_uint8</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_uint8&nbsp;b&nbsp;i</code> appends a binary unsigned 8-bit integer <code class="code">i</code> to
    <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
</div>

<pre><span id="VALadd_int8"><span class="keyword">val</span> add_int8</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_int8&nbsp;b&nbsp;i</code> appends a binary signed 8-bit integer <code class="code">i</code> to
    <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
</div>

<pre><span id="VALadd_uint16_ne"><span class="keyword">val</span> add_uint16_ne</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_uint16_ne&nbsp;b&nbsp;i</code> appends a binary native-endian unsigned 16-bit
    integer <code class="code">i</code> to <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
</div>

<pre><span id="VALadd_uint16_be"><span class="keyword">val</span> add_uint16_be</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_uint16_be&nbsp;b&nbsp;i</code> appends a binary big-endian unsigned 16-bit
    integer <code class="code">i</code> to <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
</div>

<pre><span id="VALadd_uint16_le"><span class="keyword">val</span> add_uint16_le</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_uint16_le&nbsp;b&nbsp;i</code> appends a binary little-endian unsigned 16-bit
    integer <code class="code">i</code> to <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
</div>

<pre><span id="VALadd_int16_ne"><span class="keyword">val</span> add_int16_ne</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_int16_ne&nbsp;b&nbsp;i</code> appends a binary native-endian signed 16-bit
    integer <code class="code">i</code> to <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
</div>

<pre><span id="VALadd_int16_be"><span class="keyword">val</span> add_int16_be</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_int16_be&nbsp;b&nbsp;i</code> appends a binary big-endian signed 16-bit
    integer <code class="code">i</code> to <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
</div>

<pre><span id="VALadd_int16_le"><span class="keyword">val</span> add_int16_le</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_int16_le&nbsp;b&nbsp;i</code> appends a binary little-endian signed 16-bit
    integer <code class="code">i</code> to <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
</div>

<pre><span id="VALadd_int32_ne"><span class="keyword">val</span> add_int32_ne</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int32 -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_int32_ne&nbsp;b&nbsp;i</code> appends a binary native-endian 32-bit integer
    <code class="code">i</code> to <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
</div>

<pre><span id="VALadd_int32_be"><span class="keyword">val</span> add_int32_be</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int32 -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_int32_be&nbsp;b&nbsp;i</code> appends a binary big-endian 32-bit integer
    <code class="code">i</code> to <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
</div>

<pre><span id="VALadd_int32_le"><span class="keyword">val</span> add_int32_le</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int32 -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_int32_le&nbsp;b&nbsp;i</code> appends a binary little-endian 32-bit integer
    <code class="code">i</code> to <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
</div>

<pre><span id="VALadd_int64_ne"><span class="keyword">val</span> add_int64_ne</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int64 -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_int64_ne&nbsp;b&nbsp;i</code> appends a binary native-endian 64-bit integer
    <code class="code">i</code> to <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
</div>

<pre><span id="VALadd_int64_be"><span class="keyword">val</span> add_int64_be</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int64 -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_int64_be&nbsp;b&nbsp;i</code> appends a binary big-endian 64-bit integer
    <code class="code">i</code> to <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
</div>

<pre><span id="VALadd_int64_le"><span class="keyword">val</span> add_int64_le</span> : <code class="type"><a href="Buffer.html#TYPEt">t</a> -> int64 -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add_int64_ne&nbsp;b&nbsp;i</code> appends a binary little-endian 64-bit integer
    <code class="code">i</code> to <code class="code">b</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.08</li>
</ul>
</div>
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