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  <h2>
    <span class="refentrytitle">hash</span>
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  <p>hash - Chained hash tables</p>
  <p>This module implements the hash table support used in various places in the library. </p>
  <p>Author(s): Bjorn Reese &lt;bjorn.reese@systematic.dk&gt; </p>
  <div class="refsynopsisdiv">
    <h2>Synopsis</h2>
    <pre class="synopsis">#define <a href="#XML_CAST_FPTR">XML_CAST_FPTR</a>(fptr);

typedef struct _xmlHashTable <a href=“#xmlHashTable”>xmlHashTable</a>; typedef <a href=“libxml2-hash.html#xmlHashTable”>xmlHashTable</a> * <a href=“#xmlHashTablePtr”>xmlHashTablePtr</a>; void <a href=“#xmlHashScanFull”>xmlHashScanFull</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> <a href=“libxml2-hash.html#xmlHashScannerFull”>xmlHashScannerFull</a> f, <br/> void * data); void <a href=“#xmlHashScan”>xmlHashScan</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> <a href=“libxml2-hash.html#xmlHashScanner”>xmlHashScanner</a> f, <br/> void * data); typedef void <a href=“#xmlHashScannerFull”>xmlHashScannerFull</a> (void * payload, <br/> void * data, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name2, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name3); <a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> <a href=“#xmlHashCreateDict”>xmlHashCreateDict</a> (int size, <br/> <a href=“libxml2-dict.html#xmlDictPtr”>xmlDictPtr</a> dict); int <a href=“#xmlHashAddEntry”>xmlHashAddEntry</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> void * userdata); int <a href=“#xmlHashUpdateEntry”>xmlHashUpdateEntry</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> void * userdata, <br/> <a href=“libxml2-hash.html#xmlHashDeallocator”>xmlHashDeallocator</a> f); void * <a href=“#xmlHashQLookup3”>xmlHashQLookup3</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * prefix, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * prefix2, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name2, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * prefix3, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name3); void * <a href=“#xmlHashQLookup2”>xmlHashQLookup2</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * prefix, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * prefix2, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name2); void <a href=“#xmlHashScan3”>xmlHashScan3</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name2, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name3, <br/> <a href=“libxml2-hash.html#xmlHashScanner”>xmlHashScanner</a> f, <br/> void * data); typedef void <a href=“#xmlHashScanner”>xmlHashScanner</a> (void * payload, <br/> void * data, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name); typedef void <a href=“#xmlHashDeallocator”>xmlHashDeallocator</a> (void * payload, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name); <a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> <a href=“#xmlHashCreate”>xmlHashCreate</a> (int size); void <a href=“#xmlHashFree”>xmlHashFree</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> <a href=“libxml2-hash.html#xmlHashDeallocator”>xmlHashDeallocator</a> f); void * <a href=“#xmlHashLookup”>xmlHashLookup</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name); void * <a href=“#xmlHashQLookup”>xmlHashQLookup</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <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=“#xmlHashUpdateEntry2”>xmlHashUpdateEntry2</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name2, <br/> void * userdata, <br/> <a href=“libxml2-hash.html#xmlHashDeallocator”>xmlHashDeallocator</a> f); int <a href=“#xmlHashRemoveEntry2”>xmlHashRemoveEntry2</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name2, <br/> <a href=“libxml2-hash.html#xmlHashDeallocator”>xmlHashDeallocator</a> f); int <a href=“#xmlHashRemoveEntry3”>xmlHashRemoveEntry3</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name2, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name3, <br/> <a href=“libxml2-hash.html#xmlHashDeallocator”>xmlHashDeallocator</a> f); <a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> <a href=“#xmlHashCopy”>xmlHashCopy</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> <a href=“libxml2-hash.html#xmlHashCopier”>xmlHashCopier</a> f); void <a href=“#xmlHashScanFull3”>xmlHashScanFull3</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name2, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name3, <br/> <a href=“libxml2-hash.html#xmlHashScannerFull”>xmlHashScannerFull</a> f, <br/> void * data); int <a href=“#xmlHashUpdateEntry3”>xmlHashUpdateEntry3</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name2, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name3, <br/> void * userdata, <br/> <a href=“libxml2-hash.html#xmlHashDeallocator”>xmlHashDeallocator</a> f); void <a href=“#xmlHashDefaultDeallocator”>xmlHashDefaultDeallocator</a> (void * entry, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name); void * <a href=“#xmlHashLookup3”>xmlHashLookup3</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name2, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name3); void * <a href=“#xmlHashLookup2”>xmlHashLookup2</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name2); int <a href=“#xmlHashRemoveEntry”>xmlHashRemoveEntry</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> <a href=“libxml2-hash.html#xmlHashDeallocator”>xmlHashDeallocator</a> f); typedef void * <a href=“#xmlHashCopier”>xmlHashCopier</a> (void * payload, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name); int <a href=“#xmlHashAddEntry2”>xmlHashAddEntry2</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name2, <br/> void * userdata); int <a href=“#xmlHashAddEntry3”>xmlHashAddEntry3</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name2, <br/> const <a href=“libxml2-xmlstring.html#xmlChar”>xmlChar</a> * name3, <br/> void * userdata); int <a href=“#xmlHashSize”>xmlHashSize</a> (<a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> table); </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="XML_CAST_FPTR">Macro </a>XML_CAST_FPTR</h3><pre class="programlisting">#define <a href="#XML_CAST_FPTR">XML_CAST_FPTR</a>(fptr);

</pre><p>Macro to do a casting from an object pointer to a function pointer without encountering a warning from gcc define XML_CAST_FPTR(fptr) (*(void **)(&amp;fptr)) This macro violated ISO C aliasing rules (gcc4 on s390 broke) so it is disabled now</p><div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>fptr:</span></td><td>pointer to a function</td></tr></tbody></table></div> </div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashTable">Structure </a>xmlHashTable</h3><pre class="programlisting">struct _xmlHashTable {

The content of this structure is not made public by the API. } xmlHashTable; </pre><p/> </div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashTablePtr">Typedef </a>xmlHashTablePtr</h3><pre class="programlisting"><a href="libxml2-hash.html#xmlHashTable">xmlHashTable</a> * xmlHashTablePtr;

</pre><p/> </div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashCopier"/>Function type xmlHashCopier</h3><pre class="programlisting">void * xmlHashCopier                   (void * payload, <br/>                                   const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name)<br/>

</pre><p>Callback to copy data from a hash.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>payload:</span></td><td>the data in the hash</td></tr><tr><td><span class=“term”>name:</span></td><td>the name associated</td></tr><tr><td><span class=“term”>Returns:</span></td><td>a copy of the data or NULL in case of error.</td></tr></tbody></table></div></div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashDeallocator"/>Function type xmlHashDeallocator</h3><pre class="programlisting">void xmlHashDeallocator              (void * payload, <br/>                                   const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name)<br/>

</pre><p>Callback to free data from a hash.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>payload:</span></td><td>the data in the hash</td></tr><tr><td><span class=“term”>name:</span></td><td>the name associated</td></tr></tbody></table></div></div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashScanner"/>Function type xmlHashScanner</h3><pre class="programlisting">void xmlHashScanner                  (void * payload, <br/>                                   void * data, <br/>                                      const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name)<br/>

</pre><p>Callback when scanning data in a hash with the simple scanner.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>payload:</span></td><td>the data in the hash</td></tr><tr><td><span class=“term”>data:</span></td><td>extra scanner data</td></tr><tr><td><span class=“term”>name:</span></td><td>the name associated</td></tr></tbody></table></div></div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashScannerFull"/>Function type xmlHashScannerFull</h3><pre class="programlisting">void xmlHashScannerFull              (void * payload, <br/>                                   void * data, <br/>                                      const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br/>                                       const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name3)<br/>

</pre><p>Callback when scanning data in a hash with the full scanner.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>payload:</span></td><td>the data in the hash</td></tr><tr><td><span class=“term”>data:</span></td><td>extra scanner data</td></tr><tr><td><span class=“term”>name:</span></td><td>the name associated</td></tr><tr><td><span class=“term”>name2:</span></td><td>the second name associated</td></tr><tr><td><span class=“term”>name3:</span></td><td>the third name associated</td></tr></tbody></table></div></div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashAddEntry"/>xmlHashAddEntry ()</h3><pre class="programlisting">int   xmlHashAddEntry                 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        void * userdata)<br/>

</pre><p>Add the @userdata to the hash @table. This can later be retrieved by using the @name. Duplicate names generate errors.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>userdata:</span></td><td>a pointer to the userdata</td></tr><tr><td><span class=“term”>Returns:</span></td><td>0 the addition succeeded and -1 in case of error.</td></tr></tbody></table></div></div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashAddEntry2"/>xmlHashAddEntry2 ()</h3><pre class="programlisting">int xmlHashAddEntry2                (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br/>                                       void * userdata)<br/>

</pre><p>Add the @userdata to the hash @table. This can later be retrieved by using the (@name, @name2) tuple. Duplicate tuples generate errors.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>name2:</span></td><td>a second name of the userdata</td></tr><tr><td><span class=“term”>userdata:</span></td><td>a pointer to the userdata</td></tr><tr><td><span class=“term”>Returns:</span></td><td>0 the addition succeeded and -1 in case of error.</td></tr></tbody></table></div></div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashAddEntry3"/>xmlHashAddEntry3 ()</h3><pre class="programlisting">int xmlHashAddEntry3                (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br/>                                       const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name3, <br/>                                       void * userdata)<br/>

</pre><p>Add the @userdata to the hash @table. This can later be retrieved by using the tuple (@name, @name2, @name3). Duplicate entries generate errors.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>name2:</span></td><td>a second name of the userdata</td></tr><tr><td><span class=“term”>name3:</span></td><td>a third name of the userdata</td></tr><tr><td><span class=“term”>userdata:</span></td><td>a pointer to the userdata</td></tr><tr><td><span class=“term”>Returns:</span></td><td>0 the addition succeeded and -1 in case of error.</td></tr></tbody></table></div></div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashCopy"/>xmlHashCopy ()</h3><pre class="programlisting"><a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a>       xmlHashCopy             (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    <a href="libxml2-hash.html#xmlHashCopier">xmlHashCopier</a> f)<br/>

</pre><p>Scan the hash @table and applied @f to each value.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>f:</span></td><td>the copier function for items in the hash</td></tr><tr><td><span class=“term”>Returns:</span></td><td>the new table or NULL in case of error.</td></tr></tbody></table></div></div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashCreate"/>xmlHashCreate ()</h3><pre class="programlisting"><a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a>   xmlHashCreate           (int size)<br/>

</pre><p>Create a new xmlHashTablePtr.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>size:</span></td><td>the size of the hash table</td></tr><tr><td><span class=“term”>Returns:</span></td><td>the newly created object, or NULL if an error occurred.</td></tr></tbody></table></div></div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashCreateDict"/>xmlHashCreateDict ()</h3><pre class="programlisting"><a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a>   xmlHashCreateDict       (int size, <br/>                                         <a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict)<br/>

</pre><p>Create a new <a href=“libxml2-hash.html#xmlHashTablePtr”>xmlHashTablePtr</a> which will use @dict as the internal dictionary</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>size:</span></td><td>the size of the hash table</td></tr><tr><td><span class=“term”>dict:</span></td><td>a dictionary to use for the hash</td></tr><tr><td><span class=“term”>Returns:</span></td><td>the newly created object, or NULL if an error occurred.</td></tr></tbody></table></div></div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashDefaultDeallocator"/>xmlHashDefaultDeallocator ()</h3><pre class="programlisting">void      xmlHashDefaultDeallocator       (void * entry, <br/>                                     const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name)<br/>

</pre><p>Free a hash table entry with xmlFree.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>entry:</span></td><td>the hash table entry</td></tr><tr><td><span class=“term”>name:</span></td><td>the entry's name</td></tr></tbody></table></div></div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashFree"/>xmlHashFree ()</h3><pre class="programlisting">void  xmlHashFree                     (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> f)<br/>

</pre><p>Free the hash @table 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”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>f:</span></td><td>the deallocator function for items in the hash</td></tr></tbody></table></div></div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashLookup"/>xmlHashLookup ()</h3><pre class="programlisting">void *    xmlHashLookup                   (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name)<br/>

</pre><p>Find the userdata specified by the @name.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>Returns:</span></td><td>the pointer to the userdata</td></tr></tbody></table></div></div>

<hr/>
<div class="refsect2" lang="en"><h3><a name="xmlHashLookup2"/>xmlHashLookup2 ()</h3><pre class="programlisting">void *  xmlHashLookup2                  (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2)<br/>

</pre><p>Find the userdata specified by the (@name, @name2) tuple.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>name2:</span></td><td>a second name of the userdata</td></tr><tr><td><span class=“term”>Returns:</span></td><td>the pointer to the userdata</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashLookup3"/>xmlHashLookup3 ()</h3><pre class="programlisting">void *  xmlHashLookup3                  (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br/>                                       const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name3)<br/>

</pre><p>Find the userdata specified by the (@name, @name2, @name3) tuple.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>name2:</span></td><td>a second name of the userdata</td></tr><tr><td><span class=“term”>name3:</span></td><td>a third name of the userdata</td></tr><tr><td><span class=“term”>Returns:</span></td><td>the a pointer to the userdata</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashQLookup"/>xmlHashQLookup ()</h3><pre class="programlisting">void *  xmlHashQLookup                  (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <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>Find the userdata specified by the QName @prefix:@name/@name.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>prefix:</span></td><td>the prefix of the userdata</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>Returns:</span></td><td>the pointer to the userdata</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashQLookup2"/>xmlHashQLookup2 ()</h3><pre class="programlisting">void *        xmlHashQLookup2                 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix, <br/>                                      const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix2, <br/>                                     const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2)<br/>

</pre><p>Find the userdata specified by the QNames tuple</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>prefix:</span></td><td>the prefix of the userdata</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>prefix2:</span></td><td>the second prefix of the userdata</td></tr><tr><td><span class=“term”>name2:</span></td><td>a second name of the userdata</td></tr><tr><td><span class=“term”>Returns:</span></td><td>the pointer to the userdata</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashQLookup3"/>xmlHashQLookup3 ()</h3><pre class="programlisting">void *        xmlHashQLookup3                 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix, <br/>                                      const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix2, <br/>                                     const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br/>                                       const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix3, <br/>                                     const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name3)<br/>

</pre><p>Find the userdata specified by the (@name, @name2, @name3) tuple.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>prefix:</span></td><td>the prefix of the userdata</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>prefix2:</span></td><td>the second prefix of the userdata</td></tr><tr><td><span class=“term”>name2:</span></td><td>a second name of the userdata</td></tr><tr><td><span class=“term”>prefix3:</span></td><td>the third prefix of the userdata</td></tr><tr><td><span class=“term”>name3:</span></td><td>a third name of the userdata</td></tr><tr><td><span class=“term”>Returns:</span></td><td>the a pointer to the userdata</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashRemoveEntry"/>xmlHashRemoveEntry ()</h3><pre class="programlisting">int     xmlHashRemoveEntry              (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> f)<br/>

</pre><p>Find the userdata specified by the @name and remove it from the hash @table. Existing userdata for this tuple will be removed and freed with @f.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>f:</span></td><td>the deallocator function for removed item (if any)</td></tr><tr><td><span class=“term”>Returns:</span></td><td>0 if the removal succeeded and -1 in case of error or not found.</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashRemoveEntry2"/>xmlHashRemoveEntry2 ()</h3><pre class="programlisting">int   xmlHashRemoveEntry2             (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br/>                                       <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> f)<br/>

</pre><p>Find the userdata specified by the (@name, @name2) tuple and remove it from the hash @table. Existing userdata for this tuple will be removed and freed with @f.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>name2:</span></td><td>a second name of the userdata</td></tr><tr><td><span class=“term”>f:</span></td><td>the deallocator function for removed item (if any)</td></tr><tr><td><span class=“term”>Returns:</span></td><td>0 if the removal succeeded and -1 in case of error or not found.</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashRemoveEntry3"/>xmlHashRemoveEntry3 ()</h3><pre class="programlisting">int   xmlHashRemoveEntry3             (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br/>                                       const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name3, <br/>                                       <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> f)<br/>

</pre><p>Find the userdata specified by the (@name, @name2, @name3) tuple and remove it from the hash @table. Existing userdata for this tuple will be removed and freed with @f.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>name2:</span></td><td>a second name of the userdata</td></tr><tr><td><span class=“term”>name3:</span></td><td>a third name of the userdata</td></tr><tr><td><span class=“term”>f:</span></td><td>the deallocator function for removed item (if any)</td></tr><tr><td><span class=“term”>Returns:</span></td><td>0 if the removal succeeded and -1 in case of error or not found.</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashScan"/>xmlHashScan ()</h3><pre class="programlisting">void  xmlHashScan                     (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    <a href="libxml2-hash.html#xmlHashScanner">xmlHashScanner</a> f, <br/>                                  void * data)<br/>

</pre><p>Scan the hash @table and applied @f to each value.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>f:</span></td><td>the scanner function for items in the hash</td></tr><tr><td><span class=“term”>data:</span></td><td>extra data passed to f</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashScan3"/>xmlHashScan3 ()</h3><pre class="programlisting">void        xmlHashScan3                    (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br/>                                       const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name3, <br/>                                       <a href="libxml2-hash.html#xmlHashScanner">xmlHashScanner</a> f, <br/>                                  void * data)<br/>

</pre><p>Scan the hash @table and applied @f to each value matching (@name, @name2, @name3) tuple. If one of the names is null, the comparison is considered to match.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata or NULL</td></tr><tr><td><span class=“term”>name2:</span></td><td>a second name of the userdata or NULL</td></tr><tr><td><span class=“term”>name3:</span></td><td>a third name of the userdata or NULL</td></tr><tr><td><span class=“term”>f:</span></td><td>the scanner function for items in the hash</td></tr><tr><td><span class=“term”>data:</span></td><td>extra data passed to f</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashScanFull"/>xmlHashScanFull ()</h3><pre class="programlisting">void  xmlHashScanFull                 (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    <a href="libxml2-hash.html#xmlHashScannerFull">xmlHashScannerFull</a> f, <br/>                                  void * data)<br/>

</pre><p>Scan the hash @table and applied @f to each value.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>f:</span></td><td>the scanner function for items in the hash</td></tr><tr><td><span class=“term”>data:</span></td><td>extra data passed to f</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashScanFull3"/>xmlHashScanFull3 ()</h3><pre class="programlisting">void        xmlHashScanFull3                (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br/>                                       const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name3, <br/>                                       <a href="libxml2-hash.html#xmlHashScannerFull">xmlHashScannerFull</a> f, <br/>                                  void * data)<br/>

</pre><p>Scan the hash @table and applied @f to each value matching (@name, @name2, @name3) tuple. If one of the names is null, the comparison is considered to match.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata or NULL</td></tr><tr><td><span class=“term”>name2:</span></td><td>a second name of the userdata or NULL</td></tr><tr><td><span class=“term”>name3:</span></td><td>a third name of the userdata or NULL</td></tr><tr><td><span class=“term”>f:</span></td><td>the scanner function for items in the hash</td></tr><tr><td><span class=“term”>data:</span></td><td>extra data passed to f</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashSize"/>xmlHashSize ()</h3><pre class="programlisting">int   xmlHashSize                     (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table)<br/>

</pre><p>Query the number of elements installed in the hash @table.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>Returns:</span></td><td>the number of elements in the hash table or -1 in case of error</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashUpdateEntry"/>xmlHashUpdateEntry ()</h3><pre class="programlisting">int     xmlHashUpdateEntry              (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        void * userdata, <br/>                                  <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> f)<br/>

</pre><p>Add the @userdata to the hash @table. This can later be retrieved by using the @name. Existing entry for this @name will be removed and freed with @f if found.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>userdata:</span></td><td>a pointer to the userdata</td></tr><tr><td><span class=“term”>f:</span></td><td>the deallocator function for replaced item (if any)</td></tr><tr><td><span class=“term”>Returns:</span></td><td>0 the addition succeeded and -1 in case of error.</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashUpdateEntry2"/>xmlHashUpdateEntry2 ()</h3><pre class="programlisting">int   xmlHashUpdateEntry2             (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br/>                                       void * userdata, <br/>                                  <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> f)<br/>

</pre><p>Add the @userdata to the hash @table. This can later be retrieved by using the (@name, @name2) tuple. Existing entry for this tuple will be removed and freed with @f if found.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>name2:</span></td><td>a second name of the userdata</td></tr><tr><td><span class=“term”>userdata:</span></td><td>a pointer to the userdata</td></tr><tr><td><span class=“term”>f:</span></td><td>the deallocator function for replaced item (if any)</td></tr><tr><td><span class=“term”>Returns:</span></td><td>0 the addition succeeded and -1 in case of error.</td></tr></tbody></table></div></div>

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<div class="refsect2" lang="en"><h3><a name="xmlHashUpdateEntry3"/>xmlHashUpdateEntry3 ()</h3><pre class="programlisting">int   xmlHashUpdateEntry3             (<a href="libxml2-hash.html#xmlHashTablePtr">xmlHashTablePtr</a> table, <br/>                                    const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/>                                        const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name2, <br/>                                       const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name3, <br/>                                       void * userdata, <br/>                                  <a href="libxml2-hash.html#xmlHashDeallocator">xmlHashDeallocator</a> f)<br/>

</pre><p>Add the @userdata to the hash @table. This can later be retrieved by using the tuple (@name, @name2, @name3). Existing entry for this tuple will be removed and freed with @f if found.</p> <div class=“variablelist”><table border=“0”><col align=“left”/><tbody><tr><td><span class=“term”>table:</span></td><td>the hash table</td></tr><tr><td><span class=“term”>name:</span></td><td>the name of the userdata</td></tr><tr><td><span class=“term”>name2:</span></td><td>a second name of the userdata</td></tr><tr><td><span class=“term”>name3:</span></td><td>a third name of the userdata</td></tr><tr><td><span class=“term”>userdata:</span></td><td>a pointer to the userdata</td></tr><tr><td><span class=“term”>f:</span></td><td>the deallocator function for replaced item (if any)</td></tr><tr><td><span class=“term”>Returns:</span></td><td>0 the addition succeeded and -1 in case of error.</td></tr></tbody></table></div></div>

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