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<h1>contrib/openisis/lbt.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> openisis - an open implementation of the CDS/ISIS database</span>
<a name="l00003"></a>00003 <span class="comment"> Version 0.8.x (patchlevel see file Version)</span>
<a name="l00004"></a>00004 <span class="comment"> Copyright (C) 2001-2003 by Erik Grziwotz, erik@openisis.org</span>
<a name="l00005"></a>00005 <span class="comment"></span>
<a name="l00006"></a>00006 <span class="comment"> This library is free software; you can redistribute it and/or</span>
<a name="l00007"></a>00007 <span class="comment"> modify it under the terms of the GNU Lesser General Public</span>
<a name="l00008"></a>00008 <span class="comment"> License as published by the Free Software Foundation; either</span>
<a name="l00009"></a>00009 <span class="comment"> version 2.1 of the License, or (at your option) any later version.</span>
<a name="l00010"></a>00010 <span class="comment"></span>
<a name="l00011"></a>00011 <span class="comment"> This library is distributed in the hope that it will be useful,</span>
<a name="l00012"></a>00012 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00013"></a>00013 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00014"></a>00014 <span class="comment"> Lesser General Public License for more details.</span>
<a name="l00015"></a>00015 <span class="comment"></span>
<a name="l00016"></a>00016 <span class="comment"> You should have received a copy of the GNU Lesser General Public</span>
<a name="l00017"></a>00017 <span class="comment"> License along with this library; if not, write to the Free Software</span>
<a name="l00018"></a>00018 <span class="comment"> Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span>
<a name="l00019"></a>00019 <span class="comment"></span>
<a name="l00020"></a>00020 <span class="comment"> see README for more information</span>
<a name="l00021"></a>00021 <span class="comment">EOH */</span>
<a name="l00022"></a>00022 <span class="preprocessor">#ifndef LBT_H</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span>
<a name="l00024"></a>00024 <span class="comment">/*</span>
<a name="l00025"></a>00025 <span class="comment"> $Id: lbt.h,v 1.12 2003/05/27 11:03:30 kripke Exp $</span>
<a name="l00026"></a>00026 <span class="comment"> package interface of the btree.</span>
<a name="l00027"></a>00027 <span class="comment"> see Lehmann/Yao or the GiST for how it works.</span>
<a name="l00028"></a>00028 <span class="comment">*/</span>
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="preprocessor">#include "ldb.h"</span> <span class="comment">/* LdbPost */</span>
<a name="l00031"></a>00031
<a name="l00032"></a>00032
<a name="l00038"></a>00038 <span class="keyword">typedef</span> <span class="keywordtype">int</span> lbt_comp ( <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *a, <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *b,
<a name="l00039"></a>00039 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> l );
<a name="l00040"></a>00040
<a name="l00048"></a>00048 <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structIdx.html">Idx</a> { <span class="comment">/* actually it's a B-L-Tree ;) */</span>
<a name="l00049"></a>00049 <span class="keywordtype">int</span> fd; <span class="comment">/* the file */</span>
<a name="l00050"></a>00050 <span class="keywordtype">int</span> flg; <span class="comment">/* flags: writeable, batch */</span>
<a name="l00051"></a>00051 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> typ; <span class="comment">/* type: bsz, ifp, flags */</span>
<a name="l00052"></a>00052 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> key; <span class="comment">/* max key length */</span>
<a name="l00053"></a>00053 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> col; <span class="comment">/* collation */</span>
<a name="l00054"></a>00054 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> dpt; <span class="comment">/* depth (level of root over bottom > 0) */</span>
<a name="l00055"></a>00055 lbt_comp *cmp; <span class="comment">/* comparision function */</span>
<a name="l00056"></a>00056 <span class="comment">/* following members (and the depth above) are set automatically.</span>
<a name="l00057"></a>00057 <span class="comment"> they are going to stay and you may check them, if you're interested.</span>
<a name="l00058"></a>00058 <span class="comment"> */</span>
<a name="l00059"></a>00059 <span class="keywordtype">unsigned</span> vsz; <span class="comment">/* ifp size computed from type */</span>
<a name="l00060"></a>00060 <span class="keywordtype">unsigned</span> bsz; <span class="comment">/* block size computed from type */</span>
<a name="l00061"></a>00061 <span class="keywordtype">unsigned</span> len; <span class="comment">/* # blocks in index */</span>
<a name="l00062"></a>00062 <span class="comment">/* following members are considered internal.</span>
<a name="l00063"></a>00063 <span class="comment"> if you import lbt and rely on them, don't blame me if they change.</span>
<a name="l00064"></a>00064 <span class="comment"> */</span>
<a name="l00065"></a>00065 <span class="keywordtype">unsigned</span> hlen; <span class="comment">/* hash length */</span>
<a name="l00066"></a>00066 <span class="keywordtype">unsigned</span> clen; <span class="comment">/* cache length */</span>
<a name="l00067"></a>00067 <span class="keyword">struct </span><a class="code" href="structBlock.html">Block</a> *root; <span class="comment">/* the root */</span>
<a name="l00068"></a>00068 <span class="keyword">struct </span><a class="code" href="structBlock.html">Block</a> **hash; <span class="comment">/* hash array */</span>
<a name="l00069"></a>00069 <span class="keyword">struct </span><a class="code" href="structBlock.html">Block</a> *lru[4]; <span class="comment">/* least recently used list for lowest levels */</span>
<a name="l00070"></a>00070 <span class="keyword">struct </span><a class="code" href="structBlock.html">Block</a> *mru[4]; <span class="comment">/* tail of lru list (most recently used) */</span>
<a name="l00071"></a>00071 <span class="keyword">struct </span><a class="code" href="structChunk.html">Chunk</a> *mem;
<a name="l00072"></a>00072 <span class="keyword">struct </span><a class="code" href="structBatch.html">Batch</a> *bat;
<a name="l00073"></a>00073 } <a class="code" href="structIdx.html">Idx</a>;
<a name="l00074"></a>00074
<a name="l00075"></a>00075 <span class="keyword">enum</span> { <span class="comment">/* btree flags */</span>
<a name="l00076"></a>00076 LBT_WRITE = 0x01 <span class="comment">/* open for writing */</span>
<a name="l00077"></a>00077 };
<a name="l00078"></a>00078 <span class="keyword">enum</span> { <span class="comment">/* btree type */</span>
<a name="l00079"></a>00079 LBT_BLK1K = 0x00, <span class="comment">/* 1K blocks */</span>
<a name="l00080"></a>00080 LBT_BLK2K = 0x10, <span class="comment">/* 2K blocks */</span>
<a name="l00081"></a>00081 LBT_BLK4K = 0x20, <span class="comment">/* 4K blocks */</span>
<a name="l00082"></a>00082 LBT_BLK8K = 0x30, <span class="comment">/* 8K blocks */</span>
<a name="l00083"></a>00083 LBT_CMPRS = 0x80 <span class="comment">/* compressed keys */</span>
<a name="l00084"></a>00084 };
<a name="l00085"></a>00085
<a name="l00086"></a>00086
<a name="l00087"></a>00087
<a name="l00091"></a>00091 <span class="keyword">extern</span> <span class="keywordtype">int</span> lbt_init ( <a class="code" href="structIdx.html">Idx</a> *bt );
<a name="l00092"></a>00092
<a name="l00096"></a>00096 <span class="keyword">extern</span> <span class="keywordtype">void</span> lbt_close ( <a class="code" href="structIdx.html">Idx</a> *bt );
<a name="l00097"></a>00097
<a name="l00098"></a>00098 <span class="keyword">extern</span> <span class="keywordtype">int</span> lbt_batch ( <a class="code" href="structIdx.html">Idx</a> *bt, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> pctfree );
<a name="l00099"></a>00099 <span class="keyword">extern</span> <span class="keywordtype">int</span> lbt_batchval ( <a class="code" href="structIdx.html">Idx</a> *bt, <a class="code" href="structKey.html">Key</a> *key );
<a name="l00100"></a>00100
<a name="l00101"></a>00101 <span class="keyword">extern</span> <span class="keywordtype">int</span> lbt_add ( <a class="code" href="structIdx.html">Idx</a> *bt, <a class="code" href="structKey.html">Key</a> *key );
<a name="l00102"></a>00102 <span class="keyword">extern</span> <span class="keywordtype">int</span> lbt_del ( <a class="code" href="structIdx.html">Idx</a> *bt, <a class="code" href="structKey.html">Key</a> *key );
<a name="l00103"></a>00103
<a name="l00104"></a>00104 <span class="keyword">extern</span> <span class="keywordtype">int</span> lbt_loop ( <a class="code" href="structIdx.html">Idx</a> *bt, DXLoop *l );
<a name="l00105"></a>00105 <span class="keyword">extern</span> <span class="keywordtype">int</span> lbt_search ( <a class="code" href="structIdx.html">Idx</a> *bt, <a class="code" href="structKey.html">Key</a> *key, <a class="code" href="structLdbPost.html">LdbPost</a> *post, <a class="code" href="structFld.html">Rec</a> *rec );
<a name="l00106"></a>00106
<a name="l00107"></a>00107 <span class="comment">/* half public ... ??? */</span>
<a name="l00108"></a>00108 <span class="keyword">extern</span> <span class="keywordtype">void</span> cXMkVal ( <a class="code" href="structIdx.html">Idx</a> *bt, <a class="code" href="structVal.html">Val</a> *val, Hit *hit );
<a name="l00109"></a>00109
<a name="l00110"></a>00110 <span class="preprocessor">#define LBT_H</span>
<a name="l00111"></a>00111 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* LBT_H */</span>
</pre></div></div>
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