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<div class="title">ksycocadict.cpp</div>  </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*  This file is part of the KDE libraries</span>
<a name="l00002"></a>00002 <span class="comment"> *  Copyright (C) 1999 Waldo Bastian &lt;bastian@kde.org&gt;</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> *  This library is free software; you can redistribute it and/or</span>
<a name="l00005"></a>00005 <span class="comment"> *  modify it under the terms of the GNU Library General Public</span>
<a name="l00006"></a>00006 <span class="comment"> *  License version 2 as published by the Free Software Foundation;</span>
<a name="l00007"></a>00007 <span class="comment"> *</span>
<a name="l00008"></a>00008 <span class="comment"> *  This library is distributed in the hope that it will be useful,</span>
<a name="l00009"></a>00009 <span class="comment"> *  but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00010"></a>00010 <span class="comment"> *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU</span>
<a name="l00011"></a>00011 <span class="comment"> *  Library General Public License for more details.</span>
<a name="l00012"></a>00012 <span class="comment"> *</span>
<a name="l00013"></a>00013 <span class="comment"> *  You should have received a copy of the GNU Library General Public License</span>
<a name="l00014"></a>00014 <span class="comment"> *  along with this library; see the file COPYING.LIB.  If not, write to</span>
<a name="l00015"></a>00015 <span class="comment"> *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,</span>
<a name="l00016"></a>00016 <span class="comment"> *  Boston, MA 02110-1301, USA.</span>
<a name="l00017"></a>00017 <span class="comment"> **/</span>
<a name="l00018"></a>00018 
<a name="l00019"></a>00019 <span class="preprocessor">#include &quot;ksycocadict.h&quot;</span>
<a name="l00020"></a>00020 <span class="preprocessor">#include &quot;ksycocaentry.h&quot;</span>
<a name="l00021"></a>00021 <span class="preprocessor">#include &quot;ksycoca.h&quot;</span>
<a name="l00022"></a>00022 
<a name="l00023"></a>00023 <span class="preprocessor">#include &lt;qptrlist.h&gt;</span>
<a name="l00024"></a>00024 <span class="preprocessor">#include &lt;qvaluelist.h&gt;</span>
<a name="l00025"></a>00025 <span class="preprocessor">#include &lt;kdebug.h&gt;</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include &lt;stdlib.h&gt;</span>
<a name="l00027"></a>00027 
<a name="l00028"></a>00028 <span class="keyword">namespace</span>
<a name="l00029"></a>00029 {
<a name="l00030"></a>00030 <span class="keyword">struct </span>string_entry {
<a name="l00031"></a>00031   string_entry(<a class="codeRef" href="qstring.html">QString</a> _key, <a class="code" href="classKSycocaEntry.html" title="Base class for all Sycoca entries.">KSycocaEntry</a> *_payload) 
<a name="l00032"></a>00032   { keyStr = _key; <a class="code" href="namespaceKStdAccel.html#acc12b2741ae01cac579a473d3e6bafce">key</a> = keyStr.unicode(); length = keyStr.length(); payload = _payload; hash = 0; }
<a name="l00033"></a>00033   uint hash;
<a name="l00034"></a>00034   <span class="keywordtype">int</span> length;
<a name="l00035"></a>00035   <span class="keyword">const</span> <a class="codeRef" href="qchar.html">QChar</a> *<a class="code" href="namespaceKStdAccel.html#acc12b2741ae01cac579a473d3e6bafce">key</a>;
<a name="l00036"></a>00036   <a class="codeRef" href="qstring.html">QString</a> keyStr;
<a name="l00037"></a>00037   <a class="code" href="classKSycocaEntry.html" title="Base class for all Sycoca entries.">KSycocaEntry</a> *payload;
<a name="l00038"></a>00038 };
<a name="l00039"></a>00039 }
<a name="l00040"></a>00040 
<a name="l00041"></a>00041 <span class="keyword">template</span> <span class="keyword">class </span><a class="codeRef" href="qptrlist.html">QPtrList&lt;string_entry&gt;</a>;
<a name="l00042"></a>00042 
<a name="l00043"></a>00043 <span class="keyword">class </span>KSycocaDictStringList : <span class="keyword">public</span> <a class="codeRef" href="qptrlist.html">QPtrList&lt;string_entry&gt;</a>
<a name="l00044"></a>00044 {
<a name="l00045"></a>00045 <span class="keyword">public</span>:
<a name="l00046"></a>00046    KSycocaDictStringList();
<a name="l00047"></a>00047 };
<a name="l00048"></a>00048 
<a name="l00049"></a>00049 KSycocaDictStringList::KSycocaDictStringList()
<a name="l00050"></a>00050 {
<a name="l00051"></a>00051    setAutoDelete(<span class="keyword">true</span>);
<a name="l00052"></a>00052 }
<a name="l00053"></a>00053 
<a name="l00054"></a>00054 KSycocaDict::KSycocaDict()
<a name="l00055"></a>00055   : d(0), mStr(0), mOffset(0)
<a name="l00056"></a>00056 {
<a name="l00057"></a>00057 }
<a name="l00058"></a>00058 
<a name="l00059"></a>00059 KSycocaDict::KSycocaDict(<a class="codeRef" href="qdatastream.html">QDataStream</a> *str, <span class="keywordtype">int</span> offset)
<a name="l00060"></a>00060   : d(0), mStr(str), mOffset(offset)
<a name="l00061"></a>00061 {
<a name="l00062"></a>00062    Q_UINT32 test1, test2;
<a name="l00063"></a>00063    str-&gt;<a class="codeRef" href="qdatastream.html#device">device</a>()-&gt;at(offset);
<a name="l00064"></a>00064    (*str) &gt;&gt; test1 &gt;&gt; test2;
<a name="l00065"></a>00065    <span class="keywordflow">if</span> ((test1 &gt; 0x000fffff) || (test2 &gt; 1024))
<a name="l00066"></a>00066    {
<a name="l00067"></a>00067        KSycoca::flagError();
<a name="l00068"></a>00068        mHashTableSize = 0;
<a name="l00069"></a>00069        mOffset = 0;
<a name="l00070"></a>00070        <span class="keywordflow">return</span>;
<a name="l00071"></a>00071    }
<a name="l00072"></a>00072 
<a name="l00073"></a>00073    str-&gt;<a class="codeRef" href="qdatastream.html#device">device</a>()-&gt;at(offset);
<a name="l00074"></a>00074    (*str) &gt;&gt; mHashTableSize;
<a name="l00075"></a>00075    (*str) &gt;&gt; mHashList;
<a name="l00076"></a>00076    mOffset = str-&gt;<a class="codeRef" href="qdatastream.html#device">device</a>()-&gt;at(); <span class="comment">// Start of hashtable</span>
<a name="l00077"></a>00077 }
<a name="l00078"></a>00078 
<a name="l00079"></a>00079 KSycocaDict::~KSycocaDict()
<a name="l00080"></a>00080 {
<a name="l00081"></a>00081    <span class="keyword">delete</span> d;
<a name="l00082"></a>00082 }
<a name="l00083"></a>00083 
<a name="l00084"></a>00084 <span class="keywordtype">void</span> 
<a name="l00085"></a>00085 KSycocaDict::add(<span class="keyword">const</span> <a class="codeRef" href="qstring.html">QString</a> &amp;key, <a class="code" href="classKSycocaEntry.html" title="Base class for all Sycoca entries.">KSycocaEntry</a> *payload)
<a name="l00086"></a>00086 {
<a name="l00087"></a>00087    <span class="keywordflow">if</span> (key.<a class="codeRef" href="qstring.html#isEmpty">isEmpty</a>()) <span class="keywordflow">return</span>; <span class="comment">// Not allowed (should never happen)</span>
<a name="l00088"></a>00088    <span class="keywordflow">if</span> (!payload) <span class="keywordflow">return</span>; <span class="comment">// Not allowed!</span>
<a name="l00089"></a>00089    <span class="keywordflow">if</span> (!d)
<a name="l00090"></a>00090    {
<a name="l00091"></a>00091        d = <span class="keyword">new</span> KSycocaDictStringList();
<a name="l00092"></a>00092    }
<a name="l00093"></a>00093 
<a name="l00094"></a>00094    string_entry *entry= <span class="keyword">new</span> string_entry(key, payload);
<a name="l00095"></a>00095    d-&gt;append(entry);
<a name="l00096"></a>00096 }
<a name="l00097"></a>00097 
<a name="l00098"></a>00098 <span class="keywordtype">void</span> 
<a name="l00099"></a>00099 KSycocaDict::remove(<span class="keyword">const</span> <a class="codeRef" href="qstring.html">QString</a> &amp;key)
<a name="l00100"></a>00100 {
<a name="l00101"></a>00101    <span class="keywordflow">if</span> (d)
<a name="l00102"></a>00102    {
<a name="l00103"></a>00103       <span class="keywordflow">for</span>(string_entry *entry=d-&gt;first(); entry; entry = d-&gt;next())
<a name="l00104"></a>00104       {
<a name="l00105"></a>00105          <span class="keywordflow">if</span> (entry-&gt;keyStr == key)
<a name="l00106"></a>00106          {
<a name="l00107"></a>00107             d-&gt;remove();
<a name="l00108"></a>00108             <span class="keywordflow">break</span>;
<a name="l00109"></a>00109          }
<a name="l00110"></a>00110       }
<a name="l00111"></a>00111    }
<a name="l00112"></a>00112 }
<a name="l00113"></a>00113    
<a name="l00114"></a>00114 <span class="keywordtype">int</span> 
<a name="l00115"></a>00115 KSycocaDict::find_string(<span class="keyword">const</span> <a class="codeRef" href="qstring.html">QString</a> &amp;key )
<a name="l00116"></a>00116 {
<a name="l00117"></a>00117    <span class="comment">//kdDebug(7011) &lt;&lt; QString(&quot;KSycocaDict::find_string(%1)&quot;).arg(key) &lt;&lt; endl;</span>
<a name="l00118"></a>00118 
<a name="l00119"></a>00119    <span class="keywordflow">if</span> (!mStr || !mOffset)
<a name="l00120"></a>00120    {
<a name="l00121"></a>00121       <a class="code" href="group__kdebug.html#ga9bfa740383bdb4858fbad6a11222200e">kdError</a>(7011) &lt;&lt; <span class="stringliteral">&quot;No database available!&quot;</span> &lt;&lt; <a class="code" href="group__kdebug.html#gaff5e249757ccf475a55473fe0357daac">endl</a>;
<a name="l00122"></a>00122       <span class="keywordflow">return</span> 0;
<a name="l00123"></a>00123    }
<a name="l00124"></a>00124 
<a name="l00125"></a>00125    <span class="keywordflow">if</span> (mHashTableSize == 0)
<a name="l00126"></a>00126       <span class="keywordflow">return</span> 0; <span class="comment">// Unlikely to find anything :-]</span>
<a name="l00127"></a>00127 
<a name="l00128"></a>00128    <span class="comment">// Read hash-table data </span>
<a name="l00129"></a>00129    uint hash = hashKey(key) % mHashTableSize;
<a name="l00130"></a>00130    <span class="comment">//kdDebug(7011) &lt;&lt; QString(&quot;hash is %1&quot;).arg(hash) &lt;&lt; endl;</span>
<a name="l00131"></a>00131 
<a name="l00132"></a>00132    uint off = mOffset+<span class="keyword">sizeof</span>(Q_INT32)*hash;
<a name="l00133"></a>00133    <span class="comment">//kdDebug(7011) &lt;&lt; QString(&quot;off is %1&quot;).arg(off,8,16) &lt;&lt; endl;</span>
<a name="l00134"></a>00134    mStr-&gt;device()-&gt;at( off );
<a name="l00135"></a>00135 
<a name="l00136"></a>00136    Q_INT32 offset;
<a name="l00137"></a>00137    (*mStr) &gt;&gt; offset;
<a name="l00138"></a>00138 
<a name="l00139"></a>00139    <span class="comment">//kdDebug(7011) &lt;&lt; QString(&quot;offset is %1&quot;).arg(offset,8,16) &lt;&lt; endl;</span>
<a name="l00140"></a>00140    <span class="keywordflow">if</span> (offset == 0)
<a name="l00141"></a>00141       <span class="keywordflow">return</span> 0;
<a name="l00142"></a>00142 
<a name="l00143"></a>00143    <span class="keywordflow">if</span> (offset &gt; 0)
<a name="l00144"></a>00144       <span class="keywordflow">return</span> offset; <span class="comment">// Positive ID</span>
<a name="l00145"></a>00145 
<a name="l00146"></a>00146    <span class="comment">// Lookup duplicate list.</span>
<a name="l00147"></a>00147    offset = -offset;
<a name="l00148"></a>00148 
<a name="l00149"></a>00149    mStr-&gt;device()-&gt;at(offset);
<a name="l00150"></a>00150    <span class="comment">//kdDebug(7011) &lt;&lt; QString(&quot;Looking up duplicate list at %1&quot;).arg(offset,8,16) &lt;&lt; endl;</span>
<a name="l00151"></a>00151    
<a name="l00152"></a>00152    <span class="keywordflow">while</span>(<span class="keyword">true</span>)
<a name="l00153"></a>00153    {
<a name="l00154"></a>00154        (*mStr) &gt;&gt; offset;
<a name="l00155"></a>00155        <span class="keywordflow">if</span> (offset == 0) <span class="keywordflow">break</span>;
<a name="l00156"></a>00156        <a class="codeRef" href="qstring.html">QString</a> dupkey;
<a name="l00157"></a>00157        (*mStr) &gt;&gt; dupkey;
<a name="l00158"></a>00158        <span class="comment">//kdDebug(7011) &lt;&lt; QString(&quot;&gt;&gt; %1 %2&quot;).arg(offset,8,16).arg(dupkey) &lt;&lt; endl;</span>
<a name="l00159"></a>00159        <span class="keywordflow">if</span> (dupkey == key) <span class="keywordflow">return</span> offset;
<a name="l00160"></a>00160    }
<a name="l00161"></a>00161    <span class="comment">//kdWarning(7011) &lt;&lt; &quot;Not found!&quot; &lt;&lt; endl;</span>
<a name="l00162"></a>00162 
<a name="l00163"></a>00163    <span class="keywordflow">return</span> 0;
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165    
<a name="l00166"></a>00166 uint 
<a name="l00167"></a>00167 KSycocaDict::count()
<a name="l00168"></a>00168 {
<a name="l00169"></a>00169    <span class="keywordflow">if</span> (!d) <span class="keywordflow">return</span> 0;
<a name="l00170"></a>00170 
<a name="l00171"></a>00171    <span class="keywordflow">return</span> d-&gt;count();
<a name="l00172"></a>00172 }
<a name="l00173"></a>00173 
<a name="l00174"></a>00174 <span class="keywordtype">void</span> 
<a name="l00175"></a>00175 KSycocaDict::clear()
<a name="l00176"></a>00176 {
<a name="l00177"></a>00177    <span class="keyword">delete</span> d;
<a name="l00178"></a>00178    d = 0;
<a name="l00179"></a>00179 }
<a name="l00180"></a>00180 
<a name="l00181"></a>00181 uint
<a name="l00182"></a>00182 KSycocaDict::hashKey( <span class="keyword">const</span> <a class="codeRef" href="qstring.html">QString</a> &amp;key)
<a name="l00183"></a>00183 {
<a name="l00184"></a>00184    <span class="keywordtype">int</span> l = key.<a class="codeRef" href="qstring.html#length">length</a>();
<a name="l00185"></a>00185    <span class="keyword">register</span> uint h = 0;
<a name="l00186"></a>00186   
<a name="l00187"></a>00187    <span class="keywordflow">for</span>(uint i = 0; i &lt; mHashList.count(); i++)
<a name="l00188"></a>00188    {
<a name="l00189"></a>00189       <span class="keywordtype">int</span> pos = mHashList[i];
<a name="l00190"></a>00190       <span class="keywordflow">if</span> (pos &lt; 0)
<a name="l00191"></a>00191       {
<a name="l00192"></a>00192          pos = -pos-1;
<a name="l00193"></a>00193          <span class="keywordflow">if</span> (pos &lt; l)
<a name="l00194"></a>00194             h = ((h * 13) + (key[l-pos].cell() % 29)) &amp; 0x3ffffff;
<a name="l00195"></a>00195       } 
<a name="l00196"></a>00196       <span class="keywordflow">else</span>
<a name="l00197"></a>00197       {
<a name="l00198"></a>00198          pos = pos-1;
<a name="l00199"></a>00199          <span class="keywordflow">if</span> (pos &lt; l)
<a name="l00200"></a>00200             h = ((h * 13) + (key[pos].cell() % 29)) &amp; 0x3ffffff;
<a name="l00201"></a>00201       }
<a name="l00202"></a>00202    }
<a name="l00203"></a>00203    <span class="keywordflow">return</span> h;
<a name="l00204"></a>00204 }
<a name="l00205"></a>00205 
<a name="l00206"></a>00206 <span class="comment">//</span>
<a name="l00207"></a>00207 <span class="comment">// Calculate the diversity of the strings at position &#39;pos&#39;</span>
<a name="l00208"></a>00208 <span class="keyword">static</span> <span class="keywordtype">int</span> 
<a name="l00209"></a>00209 calcDiversity(KSycocaDictStringList *d, <span class="keywordtype">int</span> pos, <span class="keywordtype">int</span> sz)
<a name="l00210"></a>00210 {
<a name="l00211"></a>00211    <span class="keywordflow">if</span> (pos == 0) <span class="keywordflow">return</span> 0;
<a name="l00212"></a>00212    <span class="keywordtype">bool</span> *matrix = (<span class="keywordtype">bool</span> *) calloc(sz, <span class="keyword">sizeof</span>(<span class="keywordtype">bool</span>));
<a name="l00213"></a>00213    uint usz = sz;
<a name="l00214"></a>00214 
<a name="l00215"></a>00215    <span class="keywordflow">if</span> (pos &lt; 0)
<a name="l00216"></a>00216    {
<a name="l00217"></a>00217       pos = -pos-1;
<a name="l00218"></a>00218       <span class="keywordflow">for</span>(string_entry *entry=d-&gt;first(); entry; entry = d-&gt;next())
<a name="l00219"></a>00219       {
<a name="l00220"></a>00220     <span class="keyword">register</span> <span class="keywordtype">int</span> l = entry-&gt;length;
<a name="l00221"></a>00221          <span class="keywordflow">if</span> (pos &lt; l &amp;&amp; pos != 0)
<a name="l00222"></a>00222          {
<a name="l00223"></a>00223            <span class="keyword">register</span> uint hash = ((entry-&gt;hash * 13) + (entry-&gt;key[l-pos].cell() % 29)) &amp; 0x3ffffff;
<a name="l00224"></a>00224        matrix[ hash % usz ] = <span class="keyword">true</span>;
<a name="l00225"></a>00225          }
<a name="l00226"></a>00226       }
<a name="l00227"></a>00227    }
<a name="l00228"></a>00228    <span class="keywordflow">else</span>
<a name="l00229"></a>00229    {
<a name="l00230"></a>00230       pos = pos-1;
<a name="l00231"></a>00231       <span class="keywordflow">for</span>(string_entry *entry=d-&gt;first(); entry; entry = d-&gt;next())
<a name="l00232"></a>00232       {
<a name="l00233"></a>00233          <span class="keywordflow">if</span> (pos &lt; entry-&gt;length)
<a name="l00234"></a>00234          {
<a name="l00235"></a>00235             <span class="keyword">register</span> uint hash = ((entry-&gt;hash * 13) + (entry-&gt;key[pos].cell() % 29)) &amp; 0x3ffffff;
<a name="l00236"></a>00236             matrix[ hash % usz ] = <span class="keyword">true</span>;
<a name="l00237"></a>00237          }
<a name="l00238"></a>00238       }
<a name="l00239"></a>00239    }
<a name="l00240"></a>00240    <span class="keywordtype">int</span> diversity = 0;
<a name="l00241"></a>00241    <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i=0;i&lt; sz;i++)
<a name="l00242"></a>00242       <span class="keywordflow">if</span> (matrix[i]) diversity++;
<a name="l00243"></a>00243    
<a name="l00244"></a>00244    free((<span class="keywordtype">void</span> *) matrix);
<a name="l00245"></a>00245 
<a name="l00246"></a>00246    <span class="keywordflow">return</span> diversity;
<a name="l00247"></a>00247 }
<a name="l00248"></a>00248 
<a name="l00249"></a>00249 <span class="comment">//</span>
<a name="l00250"></a>00250 <span class="comment">// Add the diversity of the strings at position &#39;pos&#39;</span>
<a name="l00251"></a>00251 <span class="keyword">static</span> <span class="keywordtype">void</span> 
<a name="l00252"></a>00252 addDiversity(KSycocaDictStringList *d, <span class="keywordtype">int</span> pos)
<a name="l00253"></a>00253 {
<a name="l00254"></a>00254    <span class="keywordflow">if</span> (pos == 0) <span class="keywordflow">return</span>;
<a name="l00255"></a>00255    <span class="keywordflow">if</span> (pos &lt; 0)
<a name="l00256"></a>00256    {
<a name="l00257"></a>00257       pos = -pos-1;
<a name="l00258"></a>00258       <span class="keywordflow">for</span>(string_entry *entry=d-&gt;first(); entry; entry = d-&gt;next())
<a name="l00259"></a>00259       {
<a name="l00260"></a>00260          <span class="keyword">register</span> <span class="keywordtype">int</span> l = entry-&gt;length;
<a name="l00261"></a>00261          <span class="keywordflow">if</span> (pos &lt; l)
<a name="l00262"></a>00262             entry-&gt;hash = ((entry-&gt;hash * 13) + (entry-&gt;key[l-pos].cell() % 29)) &amp; 0x3fffffff;
<a name="l00263"></a>00263       }
<a name="l00264"></a>00264    }
<a name="l00265"></a>00265    <span class="keywordflow">else</span>
<a name="l00266"></a>00266    {
<a name="l00267"></a>00267       pos = pos - 1;
<a name="l00268"></a>00268       <span class="keywordflow">for</span>(string_entry *entry=d-&gt;first(); entry; entry = d-&gt;next())
<a name="l00269"></a>00269       {
<a name="l00270"></a>00270          <span class="keywordflow">if</span> (pos &lt; entry-&gt;length)
<a name="l00271"></a>00271             entry-&gt;hash = ((entry-&gt;hash * 13) + (entry-&gt;key[pos].cell() % 29)) &amp; 0x3fffffff;
<a name="l00272"></a>00272       }
<a name="l00273"></a>00273    }
<a name="l00274"></a>00274 }
<a name="l00275"></a>00275 
<a name="l00276"></a>00276 
<a name="l00277"></a>00277 <span class="keywordtype">void</span> 
<a name="l00278"></a>00278 KSycocaDict::save(<a class="codeRef" href="qdatastream.html">QDataStream</a> &amp;str)
<a name="l00279"></a>00279 {
<a name="l00280"></a>00280    <span class="keywordflow">if</span> (count() == 0)
<a name="l00281"></a>00281    {
<a name="l00282"></a>00282       mHashTableSize = 0;
<a name="l00283"></a>00283       mHashList.clear();
<a name="l00284"></a>00284       str &lt;&lt; mHashTableSize;
<a name="l00285"></a>00285       str &lt;&lt; mHashList;
<a name="l00286"></a>00286       <span class="keywordflow">return</span>;
<a name="l00287"></a>00287    }
<a name="l00288"></a>00288 
<a name="l00289"></a>00289    mOffset = str.<a class="codeRef" href="qdatastream.html#device">device</a>()-&gt;at();
<a name="l00290"></a>00290 
<a name="l00291"></a>00291    <span class="comment">//kdDebug(7011) &lt;&lt; QString(&quot;KSycocaDict: %1 entries.&quot;).arg(count()) &lt;&lt; endl;</span>
<a name="l00292"></a>00292 
<a name="l00293"></a>00293    <span class="comment">//kdDebug(7011) &lt;&lt; &quot;Calculating hash keys..&quot; &lt;&lt; endl;</span>
<a name="l00294"></a>00294 
<a name="l00295"></a>00295    <span class="keywordtype">int</span> maxLength = 0;
<a name="l00296"></a>00296    <span class="comment">//kdDebug(7011) &lt;&lt; &quot;Finding maximum string length&quot; &lt;&lt; endl;</span>
<a name="l00297"></a>00297    <span class="keywordflow">for</span>(string_entry *entry=d-&gt;first(); entry; entry = d-&gt;next())
<a name="l00298"></a>00298    {
<a name="l00299"></a>00299       entry-&gt;hash = 0;
<a name="l00300"></a>00300       <span class="keywordflow">if</span> (entry-&gt;length &gt; maxLength)
<a name="l00301"></a>00301          maxLength = entry-&gt;length;
<a name="l00302"></a>00302    }
<a name="l00303"></a>00303 
<a name="l00304"></a>00304    <span class="comment">//kdDebug(7011) &lt;&lt; QString(&quot;Max string length = %1&quot;).arg(maxLength) &lt;&lt; endl;</span>
<a name="l00305"></a>00305 
<a name="l00306"></a>00306    <span class="comment">// use &quot;almost prime&quot; number for sz (to calculate diversity) and later</span>
<a name="l00307"></a>00307    <span class="comment">// for the table size of big tables</span>
<a name="l00308"></a>00308    <span class="comment">// int sz = d-&gt;count()*5-1;</span>
<a name="l00309"></a>00309    <span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> sz = count()*4 + 1;
<a name="l00310"></a>00310    <span class="keywordflow">while</span>(!(((sz % 3) &amp;&amp; (sz % 5) &amp;&amp; (sz % 7) &amp;&amp; (sz % 11) &amp;&amp; (sz % 13)))) sz+=2;
<a name="l00311"></a>00311 
<a name="l00312"></a>00312    <span class="keywordtype">int</span> maxDiv = 0;
<a name="l00313"></a>00313    <span class="keywordtype">int</span> maxPos = 0;
<a name="l00314"></a>00314    <span class="keywordtype">int</span> lastDiv = 0;
<a name="l00315"></a>00315 
<a name="l00316"></a>00316    mHashList.clear();
<a name="l00317"></a>00317 
<a name="l00318"></a>00318    <span class="comment">// try to limit diversity scan by &quot;predicting&quot; positions</span>
<a name="l00319"></a>00319    <span class="comment">// with high diversity</span>
<a name="l00320"></a>00320    <span class="keywordtype">int</span> *oldvec=<span class="keyword">new</span> <span class="keywordtype">int</span>[maxLength*2+1];
<a name="l00321"></a>00321    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=0; i&lt;(maxLength*2+1); i++) oldvec[i]=0;
<a name="l00322"></a>00322    <span class="keywordtype">int</span> mindiv=0;
<a name="l00323"></a>00323 
<a name="l00324"></a>00324    <span class="keywordflow">while</span>(<span class="keyword">true</span>)
<a name="l00325"></a>00325    {
<a name="l00326"></a>00326       <span class="keywordtype">int</span> divsum=0,divnum=0;
<a name="l00327"></a>00327 
<a name="l00328"></a>00328       maxDiv = 0;
<a name="l00329"></a>00329       maxPos = 0;
<a name="l00330"></a>00330       <span class="keywordflow">for</span>(<span class="keywordtype">int</span> pos=-maxLength; pos &lt;= maxLength; pos++)
<a name="l00331"></a>00331       {
<a name="l00332"></a>00332          <span class="comment">// cut off</span>
<a name="l00333"></a>00333          <span class="keywordflow">if</span> (oldvec[pos+maxLength]&lt;mindiv)
<a name="l00334"></a>00334          { oldvec[pos+maxLength]=0; <span class="keywordflow">continue</span>; }
<a name="l00335"></a>00335 
<a name="l00336"></a>00336          <span class="keywordtype">int</span> diversity = calcDiversity(d, pos, sz);
<a name="l00337"></a>00337          <span class="keywordflow">if</span> (diversity &gt; maxDiv)
<a name="l00338"></a>00338          {
<a name="l00339"></a>00339             maxDiv = diversity;
<a name="l00340"></a>00340             maxPos = pos;
<a name="l00341"></a>00341          }
<a name="l00342"></a>00342          oldvec[pos+maxLength]=diversity;
<a name="l00343"></a>00343          divsum+=diversity; divnum++;
<a name="l00344"></a>00344       }
<a name="l00345"></a>00345       <span class="comment">// arbitrary cut-off value 3/4 of average seems to work</span>
<a name="l00346"></a>00346       <span class="keywordflow">if</span> (divnum)
<a name="l00347"></a>00347          mindiv=(3*divsum)/(4*divnum);
<a name="l00348"></a>00348 
<a name="l00349"></a>00349       <span class="keywordflow">if</span> (maxDiv &lt;= lastDiv)
<a name="l00350"></a>00350          <span class="keywordflow">break</span>;
<a name="l00351"></a>00351       <span class="comment">// qWarning(&quot;Max Div = %d at pos %d&quot;, maxDiv, maxPos);</span>
<a name="l00352"></a>00352       lastDiv = maxDiv;
<a name="l00353"></a>00353       addDiversity(d, maxPos);
<a name="l00354"></a>00354       mHashList.append(maxPos);
<a name="l00355"></a>00355    }
<a name="l00356"></a>00356 
<a name="l00357"></a>00357    <span class="keyword">delete</span> [] oldvec;
<a name="l00358"></a>00358 
<a name="l00359"></a>00359    <span class="keywordflow">for</span>(string_entry *entry=d-&gt;first(); entry; entry = d-&gt;next())
<a name="l00360"></a>00360    {
<a name="l00361"></a>00361       entry-&gt;hash = hashKey(entry-&gt;keyStr);
<a name="l00362"></a>00362    }
<a name="l00363"></a>00363 <span class="comment">// fprintf(stderr, &quot;Calculating minimum table size..\n&quot;);</span>
<a name="l00364"></a>00364 
<a name="l00365"></a>00365    mHashTableSize = sz;
<a name="l00366"></a>00366 
<a name="l00367"></a>00367    <span class="keyword">struct </span>hashtable_entry {
<a name="l00368"></a>00368       string_entry *entry;
<a name="l00369"></a>00369       <a class="codeRef" href="qptrlist.html">QPtrList&lt;string_entry&gt;</a> *duplicates;
<a name="l00370"></a>00370       <span class="keywordtype">int</span> duplicate_offset;
<a name="l00371"></a>00371    };
<a name="l00372"></a>00372 
<a name="l00373"></a>00373    hashtable_entry *hashTable = <span class="keyword">new</span> hashtable_entry[ sz ];
<a name="l00374"></a>00374 
<a name="l00375"></a>00375    <span class="comment">//kdDebug(7011) &lt;&lt; &quot;Clearing hashtable...&quot; &lt;&lt; endl;</span>
<a name="l00376"></a>00376    <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i &lt; sz; i++)
<a name="l00377"></a>00377    {
<a name="l00378"></a>00378       hashTable[i].entry = 0;
<a name="l00379"></a>00379       hashTable[i].duplicates = 0;
<a name="l00380"></a>00380    }
<a name="l00381"></a>00381 
<a name="l00382"></a>00382    <span class="comment">//kdDebug(7011) &lt;&lt; &quot;Filling hashtable...&quot; &lt;&lt; endl;</span>
<a name="l00383"></a>00383    <span class="keywordflow">for</span>(string_entry *entry=d-&gt;first(); entry; entry = d-&gt;next())
<a name="l00384"></a>00384    {
<a name="l00385"></a>00385       <span class="keywordtype">int</span> hash = entry-&gt;hash % sz;
<a name="l00386"></a>00386       <span class="keywordflow">if</span> (!hashTable[hash].entry)
<a name="l00387"></a>00387       { <span class="comment">// First entry</span>
<a name="l00388"></a>00388          hashTable[hash].entry = entry;
<a name="l00389"></a>00389       }
<a name="l00390"></a>00390       <span class="keywordflow">else</span> 
<a name="l00391"></a>00391       {
<a name="l00392"></a>00392          <span class="keywordflow">if</span> (!hashTable[hash].duplicates)
<a name="l00393"></a>00393          { <span class="comment">// Second entry, build duplicate list.</span>
<a name="l00394"></a>00394             hashTable[hash].duplicates = <span class="keyword">new</span> <a class="codeRef" href="qptrlist.html">QPtrList&lt;string_entry&gt;</a>();
<a name="l00395"></a>00395             hashTable[hash].duplicates-&gt;append(hashTable[hash].entry);
<a name="l00396"></a>00396             hashTable[hash].duplicate_offset = 0;
<a name="l00397"></a>00397          }
<a name="l00398"></a>00398          hashTable[hash].duplicates-&gt;append(entry);
<a name="l00399"></a>00399       }
<a name="l00400"></a>00400    }
<a name="l00401"></a>00401 
<a name="l00402"></a>00402    str &lt;&lt; mHashTableSize;
<a name="l00403"></a>00403    str &lt;&lt; mHashList;
<a name="l00404"></a>00404 
<a name="l00405"></a>00405    mOffset = str.<a class="codeRef" href="qdatastream.html#device">device</a>()-&gt;at(); <span class="comment">// mOffset points to start of hashTable</span>
<a name="l00406"></a>00406    <span class="comment">//kdDebug(7011) &lt;&lt; QString(&quot;Start of Hash Table, offset = %1&quot;).arg(mOffset,8,16) &lt;&lt; endl;</span>
<a name="l00407"></a>00407 
<a name="l00408"></a>00408    <span class="keywordflow">for</span>(<span class="keywordtype">int</span> pass = 1; pass &lt;= 2; pass++)
<a name="l00409"></a>00409    {
<a name="l00410"></a>00410       str.<a class="codeRef" href="qdatastream.html#device">device</a>()-&gt;at(mOffset);
<a name="l00411"></a>00411       <span class="comment">//kdDebug(7011) &lt;&lt; QString(&quot;Writing hash table (pass #%1)&quot;).arg(pass) &lt;&lt; endl;</span>
<a name="l00412"></a>00412       <span class="keywordflow">for</span>(uint i=0; i &lt; mHashTableSize; i++)
<a name="l00413"></a>00413       {
<a name="l00414"></a>00414          Q_INT32 tmpid;
<a name="l00415"></a>00415          <span class="keywordflow">if</span> (!hashTable[i].entry)
<a name="l00416"></a>00416             tmpid = (Q_INT32) 0;
<a name="l00417"></a>00417          <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!hashTable[i].duplicates)
<a name="l00418"></a>00418             tmpid = (Q_INT32) hashTable[i].entry-&gt;payload-&gt;offset(); <span class="comment">// Positive ID</span>
<a name="l00419"></a>00419          <span class="keywordflow">else</span>
<a name="l00420"></a>00420             tmpid = (Q_INT32) -hashTable[i].duplicate_offset; <span class="comment">// Negative ID</span>
<a name="l00421"></a>00421          str &lt;&lt; tmpid;
<a name="l00422"></a>00422          <span class="comment">//kdDebug(7011) &lt;&lt; QString(&quot;Hash table : %1&quot;).arg(tmpid,8,16) &lt;&lt; endl;</span>
<a name="l00423"></a>00423       }
<a name="l00424"></a>00424       <span class="comment">//kdDebug(7011) &lt;&lt; QString(&quot;End of Hash Table, offset = %1&quot;).arg(str.device()-&gt;at(),8,16) &lt;&lt; endl;</span>
<a name="l00425"></a>00425 
<a name="l00426"></a>00426       <span class="comment">//kdDebug(7011) &lt;&lt; QString(&quot;Writing duplicate lists (pass #%1)&quot;).arg(pass) &lt;&lt; endl;</span>
<a name="l00427"></a>00427       <span class="keywordflow">for</span>(uint i=0; i &lt; mHashTableSize; i++)
<a name="l00428"></a>00428       {
<a name="l00429"></a>00429          <span class="keywordflow">if</span> (hashTable[i].duplicates)
<a name="l00430"></a>00430          {
<a name="l00431"></a>00431             <a class="codeRef" href="qptrlist.html">QPtrList&lt;string_entry&gt;</a> *dups = hashTable[i].duplicates;
<a name="l00432"></a>00432             hashTable[i].duplicate_offset = str.<a class="codeRef" href="qdatastream.html#device">device</a>()-&gt;at();
<a name="l00433"></a>00433 
<a name="l00434"></a>00434             <span class="comment">/*kdDebug(7011) &lt;&lt; QString(&quot;Duplicate lists: Offset = %1 list_size = %2&quot;)                           .arg(hashTable[i].duplicate_offset,8,16).arg(dups-&gt;count()) &lt;&lt; endl;</span>
<a name="l00435"></a>00435 <span class="comment">*/</span>
<a name="l00436"></a>00436             <span class="keywordflow">for</span>(string_entry *dup = dups-&gt;<a class="codeRef" href="qptrlist.html#first">first</a>(); dup; dup=dups-&gt;<a class="codeRef" href="qptrlist.html#next">next</a>())
<a name="l00437"></a>00437             {
<a name="l00438"></a>00438                str &lt;&lt; (Q_INT32) dup-&gt;payload-&gt;offset(); <span class="comment">// Positive ID</span>
<a name="l00439"></a>00439                str &lt;&lt; dup-&gt;keyStr;                      <span class="comment">// Key (QString)</span>
<a name="l00440"></a>00440             }
<a name="l00441"></a>00441             str &lt;&lt; (Q_INT32) 0;               <span class="comment">// End of list marker (0)</span>
<a name="l00442"></a>00442          }
<a name="l00443"></a>00443       }
<a name="l00444"></a>00444       <span class="comment">//kdDebug(7011) &lt;&lt; QString(&quot;End of Dict, offset = %1&quot;).arg(str.device()-&gt;at(),8,16) &lt;&lt; endl;</span>
<a name="l00445"></a>00445    }
<a name="l00446"></a>00446 
<a name="l00447"></a>00447    <span class="comment">//kdDebug(7011) &lt;&lt; &quot;Cleaning up hash table.&quot; &lt;&lt; endl;</span>
<a name="l00448"></a>00448    <span class="keywordflow">for</span>(uint i=0; i &lt; mHashTableSize; i++)
<a name="l00449"></a>00449    {
<a name="l00450"></a>00450       <span class="keyword">delete</span> hashTable[i].duplicates;
<a name="l00451"></a>00451    }
<a name="l00452"></a>00452    <span class="keyword">delete</span> [] hashTable;
<a name="l00453"></a>00453 }
<a name="l00454"></a>00454 
</pre></div></div>
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