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<h1>dbm/sdbm/sdbm_private.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* Licensed to the Apache Software Foundation (ASF) under one or more</span>
<a name="l00002"></a>00002 <span class="comment"> * contributor license agreements. See the NOTICE file distributed with</span>
<a name="l00003"></a>00003 <span class="comment"> * this work for additional information regarding copyright ownership.</span>
<a name="l00004"></a>00004 <span class="comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</span>
<a name="l00005"></a>00005 <span class="comment"> * (the "License"); you may not use this file except in compliance with</span>
<a name="l00006"></a>00006 <span class="comment"> * the License. You may obtain a copy of the License at</span>
<a name="l00007"></a>00007 <span class="comment"> *</span>
<a name="l00008"></a>00008 <span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span>
<a name="l00009"></a>00009 <span class="comment"> *</span>
<a name="l00010"></a>00010 <span class="comment"> * Unless required by applicable law or agreed to in writing, software</span>
<a name="l00011"></a>00011 <span class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</span>
<a name="l00012"></a>00012 <span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<a name="l00013"></a>00013 <span class="comment"> * See the License for the specific language governing permissions and</span>
<a name="l00014"></a>00014 <span class="comment"> * limitations under the License.</span>
<a name="l00015"></a>00015 <span class="comment"> */</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="comment">/*</span>
<a name="l00018"></a>00018 <span class="comment"> * sdbm - ndbm work-alike hashed database library</span>
<a name="l00019"></a>00019 <span class="comment"> * based on Per-Ake Larson's Dynamic Hashing algorithms. BIT 18 (1978).</span>
<a name="l00020"></a>00020 <span class="comment"> * author: oz@nexus.yorku.ca</span>
<a name="l00021"></a>00021 <span class="comment"> */</span>
<a name="l00022"></a>00022
<a name="l00023"></a>00023 <span class="preprocessor">#ifndef SDBM_PRIVATE_H</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span><span class="preprocessor">#define SDBM_PRIVATE_H</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include "apr.h"</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include "apr_pools.h"</span>
<a name="l00028"></a>00028 <span class="preprocessor">#include "apr_file_io.h"</span>
<a name="l00029"></a>00029 <span class="preprocessor">#include "apr_errno.h"</span> <span class="comment">/* for apr_status_t */</span>
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="preprocessor">#if 0</span>
<a name="l00032"></a>00032 <span class="preprocessor"></span><span class="comment">/* if the block/page size is increased, it breaks perl apr_sdbm_t compatibility */</span>
<a name="l00033"></a>00033 <span class="preprocessor">#define DBLKSIZ 16384</span>
<a name="l00034"></a>00034 <span class="preprocessor"></span><span class="preprocessor">#define PBLKSIZ 8192</span>
<a name="l00035"></a>00035 <span class="preprocessor"></span><span class="preprocessor">#define PAIRMAX 8008 </span><span class="comment">/* arbitrary on PBLKSIZ-N */</span>
<a name="l00036"></a>00036 <span class="preprocessor">#else</span>
<a name="l00037"></a>00037 <span class="preprocessor"></span><span class="preprocessor">#define DBLKSIZ 4096</span>
<a name="l00038"></a>00038 <span class="preprocessor"></span><span class="preprocessor">#define PBLKSIZ 1024</span>
<a name="l00039"></a>00039 <span class="preprocessor"></span><span class="preprocessor">#define PAIRMAX 1008 </span><span class="comment">/* arbitrary on PBLKSIZ-N */</span>
<a name="l00040"></a>00040 <span class="preprocessor">#endif</span>
<a name="l00041"></a>00041 <span class="preprocessor"></span><span class="preprocessor">#define SPLTMAX 10 </span><span class="comment">/* maximum allowed splits */</span>
<a name="l00042"></a>00042
<a name="l00043"></a>00043 <span class="comment">/* for apr_sdbm_t.flags */</span>
<a name="l00044"></a>00044 <span class="preprocessor">#define SDBM_RDONLY 0x1 </span><span class="comment">/* data base open read-only */</span>
<a name="l00045"></a>00045 <span class="preprocessor">#define SDBM_SHARED 0x2 </span><span class="comment">/* data base open for sharing */</span>
<a name="l00046"></a>00046 <span class="preprocessor">#define SDBM_SHARED_LOCK 0x4 </span><span class="comment">/* data base locked for shared read */</span>
<a name="l00047"></a>00047 <span class="preprocessor">#define SDBM_EXCLUSIVE_LOCK 0x8 </span><span class="comment">/* data base locked for write */</span>
<a name="l00048"></a>00048
<a name="l00049"></a><a class="code" href="structapr__sdbm__t.html">00049</a> <span class="keyword">struct </span><a class="code" href="structapr__sdbm__t.html">apr_sdbm_t</a> {
<a name="l00050"></a>00050 apr_pool_t *pool;
<a name="l00051"></a>00051 apr_file_t *dirf; <span class="comment">/* directory file descriptor */</span>
<a name="l00052"></a>00052 apr_file_t *pagf; <span class="comment">/* page file descriptor */</span>
<a name="l00053"></a>00053 apr_int32_t flags; <span class="comment">/* status/error flags, see below */</span>
<a name="l00054"></a>00054 <span class="keywordtype">long</span> maxbno; <span class="comment">/* size of dirfile in bits */</span>
<a name="l00055"></a>00055 <span class="keywordtype">long</span> curbit; <span class="comment">/* current bit number */</span>
<a name="l00056"></a>00056 <span class="keywordtype">long</span> hmask; <span class="comment">/* current hash mask */</span>
<a name="l00057"></a>00057 <span class="keywordtype">long</span> blkptr; <span class="comment">/* current block for nextkey */</span>
<a name="l00058"></a>00058 <span class="keywordtype">int</span> keyptr; <span class="comment">/* current key for nextkey */</span>
<a name="l00059"></a>00059 <span class="keywordtype">long</span> blkno; <span class="comment">/* current page to read/write */</span>
<a name="l00060"></a>00060 <span class="keywordtype">long</span> pagbno; <span class="comment">/* current page in pagbuf */</span>
<a name="l00061"></a>00061 <span class="keywordtype">char</span> pagbuf[PBLKSIZ]; <span class="comment">/* page file block buffer */</span>
<a name="l00062"></a>00062 <span class="keywordtype">long</span> dirbno; <span class="comment">/* current block in dirbuf */</span>
<a name="l00063"></a>00063 <span class="keywordtype">char</span> dirbuf[DBLKSIZ]; <span class="comment">/* directory file block buffer */</span>
<a name="l00064"></a>00064 <span class="keywordtype">int</span> lckcnt; <span class="comment">/* number of calls to sdbm_lock */</span>
<a name="l00065"></a>00065 };
<a name="l00066"></a>00066
<a name="l00067"></a>00067
<a name="l00068"></a>00068 <span class="preprocessor">#define sdbm_hash apu__sdbm_hash</span>
<a name="l00069"></a>00069 <span class="preprocessor"></span><span class="preprocessor">#define sdbm_nullitem apu__sdbm_nullitem</span>
<a name="l00070"></a>00070 <span class="preprocessor"></span>
<a name="l00071"></a>00071 <span class="keyword">extern</span> <span class="keyword">const</span> <a class="code" href="structapr__sdbm__datum__t.html">apr_sdbm_datum_t</a> sdbm_nullitem;
<a name="l00072"></a>00072
<a name="l00073"></a>00073 <span class="keywordtype">long</span> sdbm_hash(<span class="keyword">const</span> <span class="keywordtype">char</span> *str, <span class="keywordtype">int</span> len);
<a name="l00074"></a>00074
<a name="l00075"></a>00075 <span class="comment">/*</span>
<a name="l00076"></a>00076 <span class="comment"> * zero the cache</span>
<a name="l00077"></a>00077 <span class="comment"> */</span>
<a name="l00078"></a>00078 <span class="preprocessor">#define SDBM_INVALIDATE_CACHE(db, finfo) \</span>
<a name="l00079"></a>00079 <span class="preprocessor"> do { db->dirbno = (!finfo.size) ? 0 : -1; \</span>
<a name="l00080"></a>00080 <span class="preprocessor"> db->pagbno = -1; \</span>
<a name="l00081"></a>00081 <span class="preprocessor"> db->maxbno = (long)(finfo.size * BYTESIZ); \</span>
<a name="l00082"></a>00082 <span class="preprocessor"> } while (0);</span>
<a name="l00083"></a>00083 <span class="preprocessor"></span>
<a name="l00084"></a>00084 <span class="preprocessor">#endif </span><span class="comment">/* SDBM_PRIVATE_H */</span>
</pre></div></div>
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