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<title>dict: string dictionary</title>
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<h2><span class="refentrytitle">dict</span></h2>
<p>dict - string dictionary</p>
<p>dictionary of reusable strings, just used to avoid allocation and freeing operations. </p>
<p>Author(s): Daniel Veillard </p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<pre class="synopsis">typedef struct _xmlDict <a href="#xmlDict">xmlDict</a>;
typedef <a href="libxml2-dict.html#xmlDict">xmlDict</a> * <a href="#xmlDictPtr">xmlDictPtr</a>;
void <a href="#xmlDictCleanup">xmlDictCleanup</a> (void);
<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> <a href="#xmlDictCreate">xmlDictCreate</a> (void);
<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> <a href="#xmlDictCreateSub">xmlDictCreateSub</a> (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> sub);
const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * <a href="#xmlDictExists">xmlDictExists</a> (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> int len);
void <a href="#xmlDictFree">xmlDictFree</a> (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict);
size_t <a href="#xmlDictGetUsage">xmlDictGetUsage</a> (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict);
const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * <a href="#xmlDictLookup">xmlDictLookup</a> (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> int len);
int <a href="#xmlDictOwns">xmlDictOwns</a> (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str);
const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * <a href="#xmlDictQLookup">xmlDictQLookup</a> (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name);
int <a href="#xmlDictReference">xmlDictReference</a> (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict);
size_t <a href="#xmlDictSetLimit">xmlDictSetLimit</a> (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict, <br> size_t limit);
int <a href="#xmlDictSize">xmlDictSize</a> (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict);
int <a href="#xmlInitializeDict">xmlInitializeDict</a> (void);
</pre>
</div>
<div class="refsect1" lang="en"><h2>Description</h2></div>
<div class="refsect1" lang="en">
<h2>Details</h2>
<div class="refsect2" lang="en">
<div class="refsect2" lang="en">
<h3>
<a name="xmlDict">Structure </a>xmlDict</h3>
<pre class="programlisting">struct _xmlDict {
The content of this structure is not made public by the API.
} xmlDict;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlDictPtr">Typedef </a>xmlDictPtr</h3>
<pre class="programlisting"><a href="libxml2-dict.html#xmlDict">xmlDict</a> * xmlDictPtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlDictCleanup"></a>xmlDictCleanup ()</h3>
<pre class="programlisting">void xmlDictCleanup (void)<br>
</pre>
<p>DEPRECATED: This function is a no-op. Call <a href="libxml2-parser.html#xmlCleanupParser">xmlCleanupParser</a> to free global state but see the warnings there. <a href="libxml2-parser.html#xmlCleanupParser">xmlCleanupParser</a> should be only called once at program exit. In most cases, you don't have call cleanup functions at all.</p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlDictCreate"></a>xmlDictCreate ()</h3>
<pre class="programlisting"><a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> xmlDictCreate (void)<br>
</pre>
<p>Create a new dictionary</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the newly created dictionary, or NULL if an error occurred.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlDictCreateSub"></a>xmlDictCreateSub ()</h3>
<pre class="programlisting"><a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> xmlDictCreateSub (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> sub)<br>
</pre>
<p>Create a new dictionary, inheriting strings from the read-only dictionary @sub. On lookup, strings are first searched in the new dictionary, then in @sub, and if not found are created in the new dictionary.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>sub</tt></i>:</span></td>
<td>an existing dictionary</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the newly created dictionary, or NULL if an error occurred.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlDictExists"></a>xmlDictExists ()</h3>
<pre class="programlisting">const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * xmlDictExists (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> int len)<br>
</pre>
<p>Check if a string exists in the dictionary.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>dict</tt></i>:</span></td>
<td>the dictionary</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>the name of the userdata</td>
</tr>
<tr>
<td><span class="term"><i><tt>len</tt></i>:</span></td>
<td>the length of the name, if -1 it is recomputed</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the internal copy of the name or NULL if not found.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlDictFree"></a>xmlDictFree ()</h3>
<pre class="programlisting">void xmlDictFree (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict)<br>
</pre>
<p>Free the hash @dict and its contents. The userdata is deallocated with @f if provided.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>dict</tt></i>:</span></td>
<td>the dictionary</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlDictGetUsage"></a>xmlDictGetUsage ()</h3>
<pre class="programlisting">size_t xmlDictGetUsage (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict)<br>
</pre>
<p>Get how much memory is used by a dictionary for strings Added in 2.9.0</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>dict</tt></i>:</span></td>
<td>the dictionary</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the amount of strings allocated</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlDictLookup"></a>xmlDictLookup ()</h3>
<pre class="programlisting">const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * xmlDictLookup (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> int len)<br>
</pre>
<p>Lookup a string and add it to the dictionary if it wasn't found.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>dict</tt></i>:</span></td>
<td>dictionary</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>string key</td>
</tr>
<tr>
<td><span class="term"><i><tt>len</tt></i>:</span></td>
<td>length of the key, if -1 it is recomputed</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the interned copy of the string or NULL if a memory allocation failed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlDictOwns"></a>xmlDictOwns ()</h3>
<pre class="programlisting">int xmlDictOwns (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str)<br>
</pre>
<p>check if a string is owned by the dictionary</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>dict</tt></i>:</span></td>
<td>the dictionary</td>
</tr>
<tr>
<td><span class="term"><i><tt>str</tt></i>:</span></td>
<td>the string</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>1 if true, 0 if false and -1 in case of error -1 in case of error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlDictQLookup"></a>xmlDictQLookup ()</h3>
<pre class="programlisting">const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * xmlDictQLookup (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name)<br>
</pre>
<p>Lookup the QName @prefix:@name and add it to the dictionary if it wasn't found.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>dict</tt></i>:</span></td>
<td>the dictionary</td>
</tr>
<tr>
<td><span class="term"><i><tt>prefix</tt></i>:</span></td>
<td>the prefix</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>the name</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the interned copy of the string or NULL if a memory allocation failed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlDictReference"></a>xmlDictReference ()</h3>
<pre class="programlisting">int xmlDictReference (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict)<br>
</pre>
<p>Increment the <a href="libxml2-SAX.html#reference">reference</a> counter of a dictionary</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>dict</tt></i>:</span></td>
<td>the dictionary</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>0 in case of success and -1 in case of error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlDictSetLimit"></a>xmlDictSetLimit ()</h3>
<pre class="programlisting">size_t xmlDictSetLimit (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict, <br> size_t limit)<br>
</pre>
<p>Set a size limit for the dictionary Added in 2.9.0</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>dict</tt></i>:</span></td>
<td>the dictionary</td>
</tr>
<tr>
<td><span class="term"><i><tt>limit</tt></i>:</span></td>
<td>the limit in bytes</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the previous limit of the dictionary or 0</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlDictSize"></a>xmlDictSize ()</h3>
<pre class="programlisting">int xmlDictSize (<a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict)<br>
</pre>
<p>Query the number of elements installed in the hash @dict.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>dict</tt></i>:</span></td>
<td>the dictionary</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the number of elements in the dictionary or -1 in case of error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlInitializeDict"></a>xmlInitializeDict ()</h3>
<pre class="programlisting">int xmlInitializeDict (void)<br>
</pre>
<p>DEPRECATED: Alias for <a href="libxml2-parser.html#xmlInitParser">xmlInitParser</a>.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>0.</td>
</tr></tbody>
</table></div>
</div>
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