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<link title="Netsmtp" rel="Chapter" href="Netsmtp.html"><title>Ocamlnet 2 Reference Manual : Netulex.ULB</title>
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<center><h1>Module <a href="type_Netulex.ULB.html">Netulex.ULB</a></h1></center>
<br>
<pre><span class="keyword">module</span> ULB: <code class="code">sig</code> <a href="Netulex.ULB.html">..</a> <code class="code">end</code></pre><hr width="100%">
<br>
This module provides the <code class="code">unicode_lexbuf</code> record with
access functions. In this record, the data is available
in two forms: As an array of Unicode code points
<code class="code">ulb_chars</code>, and as string of encoded chars <code class="code">ulb_rawbuf</code>.
Both buffers are synchronised by <code class="code">ulb_chars_pos</code>. This
array stores where every character of <code class="code">ulb_chars</code> can be
found in <code class="code">ulb_rawbuf</code>.<br>
<br><code><span class="keyword">type</span> <a name="TYPEunicode_lexbuf"></a><code class="type"></code>unicode_lexbuf = private {</code><table class="typetable">
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span>ulb_encoding : <code class="type"><a href="Netconversion.html#TYPEencoding">Netconversion.encoding</a></code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" >The character encoding of <code class="code">ulb_rawbuf</code></td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span>ulb_encoding_start : <code class="type">int</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" >The first character position to which <code class="code">ulb_encoding</code>
applies (the encoding of earlier positions is
lost)</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span>ulb_rawbuf : <code class="type">string</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" >The encoded string to analyse</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span>ulb_rawbuf_len : <code class="type">int</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" >The filled part of <code class="code">ulb_rawbuf</code></td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span>ulb_rawbuf_end : <code class="type">int</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" >The analysed part of <code class="code">ulb_rawbuf</code>. We have always
<code class="code">ulb_rawbuf_end <= ulb_rawbuf_len</code>. The analysed part
may be shorter than the filled part because there is
not enough space in <code class="code">ulb_chars</code>, or because the filled
part ends with an incomplete multi-byte character</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span>ulb_rawbuf_const : <code class="type">bool</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" >Whether <code class="code">ulb_rawbuf</code> is considered as a constant. If
<code class="code">true</code>, it is never blitted.</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span>ulb_chars : <code class="type">int array</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" >The analysed part of <code class="code">ulb_rawbuf</code> as array of Unicode
code points. Only the positions 0 to <code class="code">ulb_chars_len-1</code>
of the array are filled.</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span>ulb_chars_pos : <code class="type">int array</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" >For every analysed character this array stores the
byte position where the character begins in <code class="code">ulb_rawbuf</code>.
In addition, the array contains at <code class="code">ulb_chars_len</code> the
value of <code class="code">ulb_rawbuf_end</code>.
<p>
This array is one element longer than <code class="code">ulb_chars</code>.</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span>ulb_chars_len : <code class="type">int</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" >The filled part of <code class="code">ulb_chars</code></td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span>ulb_eof : <code class="type">bool</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" >Whether EOF has been seen</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span>ulb_refill : <code class="type">string -> int -> int -> int</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" >The refill function</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span>ulb_enc_change_hook : <code class="type"><a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" >This function is called when the encoding changes</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span class="keyword">mutable </span>ulb_cursor : <code class="type"><a href="Netconversion.html#TYPEcursor">Netconversion.cursor</a></code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" >Internally used by the implementation</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr></table>
}
<pre><span class="keyword">val</span> <a name="VALfrom_function"></a>from_function : <code class="type">?raw_size:int -><br> ?char_size:int -><br> ?enc_change_hook:(<a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit) -><br> refill:(string -> int -> int -> int) -><br> <a href="Netconversion.html#TYPEencoding">Netconversion.encoding</a> -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a></code></pre><div class="info">
Creates a <code class="code">unicode_lexbuf</code> to analyse strings of the
passed <code class="code">encoding</code> coming from the <code class="code">refill</code> function.
<p>
<br>
</div>
<div class="param_info"><code class="code">raw_size</code> : The initial size for <code class="code">ulb_rawbuf</code>. Defaults to 512</div>
<div class="param_info"><code class="code">char_size</code> : The initial size for <code class="code">ulb_chars</code>. Defaults to 256</div>
<div class="param_info"><code class="code">enc_change_hook</code> : This function is called when the encoding
is changed, either by this module, or by the user calling
<code class="code">set_encoding</code>.</div>
<div class="param_info"><code class="code">refill</code> : This function is called with arguments <code class="code">ulb_rawbuf</code>,
<code class="code">ulb_rawbuf_len</code>, and <code class="code">l</code>, where
<code class="code">l = String.length ulb_rawbuf - ulb_rawbuf_len</code> is the free
space in the buffer. The function should fill new bytes into
this substring, and return the number of added bytes. The
return value 0 signals EOF.</div>
<pre><span class="keyword">val</span> <a name="VALfrom_in_obj_channel"></a>from_in_obj_channel : <code class="type">?raw_size:int -><br> ?char_size:int -><br> ?enc_change_hook:(<a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit) -><br> <a href="Netconversion.html#TYPEencoding">Netconversion.encoding</a> -><br> <a href="Netchannels.in_obj_channel.html">Netchannels.in_obj_channel</a> -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a></code></pre><div class="info">
Creates a <code class="code">unicode_lexbuf</code> to analyse strings of the
passed <code class="code">encoding</code> coming from the object channel.
<p>
<br>
</div>
<div class="param_info"><code class="code">raw_size</code> : The initial size for <code class="code">ulb_rawbuf</code>. Defaults to 512</div>
<div class="param_info"><code class="code">char_size</code> : The initial size for <code class="code">ulb_chars</code>. Defaults to 256</div>
<div class="param_info"><code class="code">enc_change_hook</code> : This function is called when the encoding
is changed, either by this module, or by the user calling
<code class="code">set_encoding</code>.</div>
<pre><span class="keyword">val</span> <a name="VALfrom_string"></a>from_string : <code class="type">?enc_change_hook:(<a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit) -><br> <a href="Netconversion.html#TYPEencoding">Netconversion.encoding</a> -> string -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a></code></pre><div class="info">
Creates a <code class="code">unicode_lexbuf</code> analysing the passed string encoded in
the passed encoding. This function copies the input string.
<p>
<br>
</div>
<div class="param_info"><code class="code">enc_change_hook</code> : This function is called when the encoding
is changed, either by this module, or by the user calling
<code class="code">set_encoding</code></div>
<pre><span class="keyword">val</span> <a name="VALfrom_string_inplace"></a>from_string_inplace : <code class="type">?enc_change_hook:(<a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit) -><br> <a href="Netconversion.html#TYPEencoding">Netconversion.encoding</a> -> string -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a></code></pre><div class="info">
Creates a <code class="code">unicode_lexbuf</code> analysing the passed string encoded in
the passed encoding. This function does not copy the input string,
but uses it directly as <code class="code">ulb_rawbuf</code>. The string is not modified by <code class="code">ULB</code>,
but the caller must ensure that other program parts do not
modify it either.
<p>
<br>
</div>
<div class="param_info"><code class="code">enc_change_hook</code> : This function is called when the encoding
is changed, either by this module, or by the user calling
<code class="code">set_encoding</code></div>
<pre><span class="keyword">val</span> <a name="VALdelete"></a>delete : <code class="type">int -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit</code></pre><div class="info">
Deletes the number of characters from <code class="code">unicode_lexbuf</code>.
These characters
are removed from the beginning of the buffer, i.e.
<code class="code">ulb_chars.(n)</code> becomes the new first character of the
buffer. All three buffers <code class="code">ulb_rawbuf</code>, <code class="code">ulb_chars</code>, and
<code class="code">ulb_chars_pos</code> are blitted as necessary.
<p>
When the buffer is already at EOF, the function fails.
<p>
For efficiency, it should be tried to call <code class="code">delete</code> as seldom as
possible. Its speed is linear to the number of characters to move.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALrefill"></a>refill : <code class="type"><a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit</code></pre><div class="info">
Tries to add characters to the <code class="code">unicode_lexbuf</code> by calling the
<code class="code">ulb_refill</code> function. When the buffer is already at EOF, the
exception <code class="code">End_of_file</code> is raised, and the buffer is not modified.
Otherwise, the <code class="code">ulb_refill</code> function is called to
add new characters. If necessary, <code class="code">ulb_rawbuf</code>, <code class="code">ulb_chars</code>, and
<code class="code">ulb_chars_pos</code> are enlarged such that it is ensured that either
at least one new character is added, or that EOF is found for
the first time
In the latter case, <code class="code">ulb_eof</code> is set to <code class="code">true</code> (and the next call
of <code class="code">refill_unicode_lexbuf</code> will raise <code class="code">End_of_file</code>).<br>
</div>
<pre><span class="keyword">val</span> <a name="VALset_encoding"></a>set_encoding : <code class="type"><a href="Netconversion.html#TYPEencoding">Netconversion.encoding</a> -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit</code></pre><div class="info">
Sets the <code class="code">encoding</code> to the passed value. This only affects future
<code class="code">refill</code> calls. The hook <code class="code">enc_change_hook</code> is invoked when defined.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALclose"></a>close : <code class="type"><a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> unit</code></pre><div class="info">
Sets <code class="code">ulb_eof</code> of the <code class="code">unicode_lexbuf</code>. The rest of the buffer
is not modified<br>
</div>
<pre><span class="keyword">val</span> <a name="VALutf8_sub_string"></a>utf8_sub_string : <code class="type">int -> int -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> string</code></pre><div class="info">
The two <code class="code">int</code> arguments are the position and length of a sub
string of the lexbuf that is returned as UTF8 string. Position
and length are given as character multiples, not byte multiples.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALutf8_sub_string_length"></a>utf8_sub_string_length : <code class="type">int -> int -> <a href="Netulex.ULB.html#TYPEunicode_lexbuf">unicode_lexbuf</a> -> int</code></pre><div class="info">
Returns <code class="code">String.length(utf8_sub_string args)</code>. Tries not to
allocate the UTF-8 string.<br>
</div>
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