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<h1>oscl_file_cache.h</h1><a href="oscl__file__cache_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// -*- c++ -*-</span>
<a name="l00002"></a>00002 <span class="comment">// = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =</span>
<a name="l00003"></a>00003 
<a name="l00004"></a>00004 <span class="comment">//                     O S C L _ F I L E  _ C A C H E</span>
<a name="l00005"></a>00005 
<a name="l00006"></a>00006 <span class="comment">// = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =</span>
<a name="l00007"></a>00007 
<a name="l00019"></a>00019 <span class="preprocessor">#ifndef OSCL_FILE_CACHE_H_INCLUDED</span>
<a name="l00020"></a>00020 <span class="preprocessor"></span><span class="preprocessor">#define OSCL_FILE_CACHE_H_INCLUDED</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span>
<a name="l00022"></a>00022 <span class="preprocessor">#ifndef OSCLCONFIG_IO_H_INCLUDED</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="preprocessor">#include &quot;<a class="code" href="osclconfig__io_8h.html" title="This file contains common typedefs based on the ANSI C limits.h header.">osclconfig_io.h</a>&quot;</span>
<a name="l00024"></a>00024 <span class="preprocessor">#endif</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span>
<a name="l00026"></a>00026 <span class="preprocessor">#ifndef OSCL_BASE_H_INCLUDED</span>
<a name="l00027"></a>00027 <span class="preprocessor"></span><span class="preprocessor">#include &quot;<a class="code" href="oscl__base_8h.html" title="The file oscl_base.h is the public header that should be included to pick up the...">oscl_base.h</a>&quot;</span>
<a name="l00028"></a>00028 <span class="preprocessor">#endif</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span>
<a name="l00030"></a>00030 <span class="preprocessor">#include &quot;<a class="code" href="oscl__file__io_8h.html" title="The file oscl_file_io.h defines the class Oscl_File. This is the public API to the...">oscl_file_io.h</a>&quot;</span>
<a name="l00031"></a>00031 
<a name="l00032"></a>00032 <span class="keyword">class </span><a class="code" href="classOsclFileCache.html">OsclFileCache</a>;
<a name="l00033"></a>00033 
<a name="l00034"></a><a class="code" href="classOsclFileCacheBuffer.html">00034</a> <span class="keyword">class </span><a class="code" href="classOsclFileCacheBuffer.html">OsclFileCacheBuffer</a>
<a name="l00035"></a>00035 {
<a name="l00036"></a>00036     <span class="keyword">public</span>:
<a name="l00037"></a><a class="code" href="classOsclFileCacheBuffer.html#a52e7fe4a7bcd4cbdc9afe9907d1a7a60">00037</a>         <a class="code" href="classOsclFileCacheBuffer.html#a52e7fe4a7bcd4cbdc9afe9907d1a7a60">OsclFileCacheBuffer</a>(): <a class="code" href="classOsclFileCacheBuffer.html#aa9ec8d60abc8fe0489790733ffaf975a">isFixed</a>(false)
<a name="l00038"></a>00038                 , <a class="code" href="classOsclFileCacheBuffer.html#aab7f903763407a4e120c637f76a2f67a">capacity</a>(0)
<a name="l00039"></a>00039                 , <a class="code" href="classOsclFileCacheBuffer.html#a641b3b437a18f81541ea1722dd8e2085">usableSize</a>(0)
<a name="l00040"></a>00040                 , <a class="code" href="classOsclFileCacheBuffer.html#a0590956b4e24af304ecbed71d3aa2334">pBuffer</a>(<a class="code" href="group__osclbase.html#ga070d2ce7b6bb7e5c05602aa8c308d0c4" title="The NULL_TERM_CHAR is used to terminate c-style strings.">NULL</a>)
<a name="l00041"></a>00041                 , <a class="code" href="classOsclFileCacheBuffer.html#acec9cae8c4ca826edc9da21fe33b2dd4">filePosition</a>(0)
<a name="l00042"></a>00042                 , <a class="code" href="classOsclFileCacheBuffer.html#a42e94233e6e7c84ccc7646385610cbf8">currentPos</a>(0)
<a name="l00043"></a>00043                 , <a class="code" href="classOsclFileCacheBuffer.html#ae522004a0eb230b5573ec769901a84d4">endPos</a>(0)
<a name="l00044"></a>00044                 , <a class="code" href="classOsclFileCacheBuffer.html#a338b719e008c8f2003fafa1c43ac7c9d">updateStart</a>(0)
<a name="l00045"></a>00045                 , <a class="code" href="classOsclFileCacheBuffer.html#ad085b7c027fb9e79f549b846c6f242be">updateEnd</a>(0)
<a name="l00046"></a>00046         {}
<a name="l00047"></a>00047 
<a name="l00048"></a><a class="code" href="classOsclFileCacheBuffer.html#a037057fbd8670587ed78d5ee0ebd8b1d">00048</a>         <a class="code" href="classOsclFileCache.html">OsclFileCache</a>* <a class="code" href="classOsclFileCacheBuffer.html#a037057fbd8670587ed78d5ee0ebd8b1d">iContainer</a>;
<a name="l00049"></a>00049 
<a name="l00050"></a>00050         <span class="comment">//Movable or fixed cache?</span>
<a name="l00051"></a><a class="code" href="classOsclFileCacheBuffer.html#aa9ec8d60abc8fe0489790733ffaf975a">00051</a>         <span class="keywordtype">bool</span> <a class="code" href="classOsclFileCacheBuffer.html#aa9ec8d60abc8fe0489790733ffaf975a">isFixed</a>;
<a name="l00052"></a>00052 
<a name="l00053"></a>00053         <span class="comment">//Capacity of the cache buffer</span>
<a name="l00054"></a><a class="code" href="classOsclFileCacheBuffer.html#aab7f903763407a4e120c637f76a2f67a">00054</a>         uint32 <a class="code" href="classOsclFileCacheBuffer.html#aab7f903763407a4e120c637f76a2f67a">capacity</a>;
<a name="l00055"></a>00055 
<a name="l00056"></a>00056         <span class="comment">//Usable size of the cache buffer (may be l.t. its capacity)</span>
<a name="l00057"></a><a class="code" href="classOsclFileCacheBuffer.html#a641b3b437a18f81541ea1722dd8e2085">00057</a>         uint32 <a class="code" href="classOsclFileCacheBuffer.html#a641b3b437a18f81541ea1722dd8e2085">usableSize</a>;
<a name="l00058"></a>00058 
<a name="l00059"></a>00059         <span class="comment">//constant pointer to cache buffer</span>
<a name="l00060"></a><a class="code" href="classOsclFileCacheBuffer.html#a0590956b4e24af304ecbed71d3aa2334">00060</a>         uint8*    <a class="code" href="classOsclFileCacheBuffer.html#a0590956b4e24af304ecbed71d3aa2334">pBuffer</a>;
<a name="l00061"></a>00061 
<a name="l00062"></a>00062         <span class="comment">//the native file position corresponding to the start of the</span>
<a name="l00063"></a>00063         <span class="comment">//cache</span>
<a name="l00064"></a><a class="code" href="classOsclFileCacheBuffer.html#acec9cae8c4ca826edc9da21fe33b2dd4">00064</a>         <a class="code" href="osclconfig__io_8h.html#a97cda56383fc49167372a11658c80483">TOsclFileOffset</a>  <a class="code" href="classOsclFileCacheBuffer.html#acec9cae8c4ca826edc9da21fe33b2dd4">filePosition</a>;
<a name="l00065"></a>00065 
<a name="l00066"></a>00066         <span class="comment">//current working position (virtual file pointer) in the cache.</span>
<a name="l00067"></a>00067         <span class="comment">//units: 0-based byte offset from beginning of cache</span>
<a name="l00068"></a><a class="code" href="classOsclFileCacheBuffer.html#a42e94233e6e7c84ccc7646385610cbf8">00068</a>         uint32    <a class="code" href="classOsclFileCacheBuffer.html#a42e94233e6e7c84ccc7646385610cbf8">currentPos</a>;
<a name="l00069"></a>00069 
<a name="l00070"></a>00070         <span class="comment">//end of valid data in the cache.</span>
<a name="l00071"></a>00071         <span class="comment">//units: 0-based byte offset from beginning of cache</span>
<a name="l00072"></a><a class="code" href="classOsclFileCacheBuffer.html#ae522004a0eb230b5573ec769901a84d4">00072</a>         uint32    <a class="code" href="classOsclFileCacheBuffer.html#ae522004a0eb230b5573ec769901a84d4">endPos</a>;
<a name="l00073"></a>00073 
<a name="l00074"></a>00074         <span class="comment">//variables to track the range of data in the cache that</span>
<a name="l00075"></a>00075         <span class="comment">//has been updated by write operations, but has not yet</span>
<a name="l00076"></a>00076         <span class="comment">//been written to disk.</span>
<a name="l00077"></a>00077         <span class="comment">//units: 0-based byte offset from beginning of cache</span>
<a name="l00078"></a><a class="code" href="classOsclFileCacheBuffer.html#a338b719e008c8f2003fafa1c43ac7c9d">00078</a>         uint32    <a class="code" href="classOsclFileCacheBuffer.html#a338b719e008c8f2003fafa1c43ac7c9d">updateStart</a>;
<a name="l00079"></a><a class="code" href="classOsclFileCacheBuffer.html#ad085b7c027fb9e79f549b846c6f242be">00079</a>         uint32    <a class="code" href="classOsclFileCacheBuffer.html#ad085b7c027fb9e79f549b846c6f242be">updateEnd</a>;
<a name="l00080"></a>00080 
<a name="l00081"></a>00081         int32 <a class="code" href="classOsclFileCacheBuffer.html#a00616cdde914390b282604d4387a1932">SetPosition</a>(<a class="code" href="osclconfig__io_8h.html#a97cda56383fc49167372a11658c80483">TOsclFileOffset</a>  pos);
<a name="l00082"></a>00082         int32 <a class="code" href="classOsclFileCacheBuffer.html#a6b74b9bea1d9ab01393d83b39a42524d">PrepRead</a>();
<a name="l00083"></a>00083         int32 <a class="code" href="classOsclFileCacheBuffer.html#a7412dec4769026762461e9ee48d09206">PrepWrite</a>();
<a name="l00084"></a>00084         int32 <a class="code" href="classOsclFileCacheBuffer.html#ac1788c011bacca688593a275d3250b7e">WriteUpdatesToFile</a>();
<a name="l00085"></a>00085         int32 <a class="code" href="classOsclFileCacheBuffer.html#ae40bae64a4f81d0a0a6087a49b0fe26f">FillFromFile</a>(uint32, uint32);
<a name="l00086"></a>00086 
<a name="l00087"></a><a class="code" href="classOsclFileCacheBuffer.html#a40c0c89bb6fda12f4a8a3289a5acc38a">00087</a>         <span class="keywordtype">bool</span> <a class="code" href="classOsclFileCacheBuffer.html#a40c0c89bb6fda12f4a8a3289a5acc38a">IsUpdated</a>()
<a name="l00088"></a>00088         {
<a name="l00089"></a>00089             <span class="keywordflow">return</span> <a class="code" href="classOsclFileCacheBuffer.html#ad085b7c027fb9e79f549b846c6f242be">updateEnd</a> &gt; <a class="code" href="classOsclFileCacheBuffer.html#a338b719e008c8f2003fafa1c43ac7c9d">updateStart</a>;
<a name="l00090"></a>00090         }
<a name="l00091"></a>00091 
<a name="l00092"></a>00092         <span class="comment">//return true if this cache contains the input position.</span>
<a name="l00093"></a><a class="code" href="classOsclFileCacheBuffer.html#a91724f00a0cb445b2e2c395cf4cf01bc">00093</a>         <span class="keywordtype">bool</span> <a class="code" href="classOsclFileCacheBuffer.html#a91724f00a0cb445b2e2c395cf4cf01bc">Contains</a>(<a class="code" href="osclconfig__io_8h.html#a97cda56383fc49167372a11658c80483">TOsclFileOffset</a>  pos)
<a name="l00094"></a>00094         {
<a name="l00095"></a>00095             <span class="keywordflow">return</span> (<a class="code" href="classOsclFileCacheBuffer.html#acec9cae8c4ca826edc9da21fe33b2dd4">filePosition</a> &lt;= pos &amp;&amp; pos &lt; <a class="code" href="classOsclFileCacheBuffer.html#acec9cae8c4ca826edc9da21fe33b2dd4">filePosition</a> + (<a class="code" href="osclconfig__io_8h.html#a97cda56383fc49167372a11658c80483">TOsclFileOffset</a>)<a class="code" href="classOsclFileCacheBuffer.html#a641b3b437a18f81541ea1722dd8e2085">usableSize</a>);
<a name="l00096"></a>00096         }
<a name="l00097"></a>00097         <span class="comment">//return true if this cache preceeds the input position.</span>
<a name="l00098"></a><a class="code" href="classOsclFileCacheBuffer.html#a68d1e0fff44556527a0b26d0ce92df30">00098</a>         <span class="keywordtype">bool</span> <a class="code" href="classOsclFileCacheBuffer.html#a68d1e0fff44556527a0b26d0ce92df30">Preceeds</a>(<a class="code" href="osclconfig__io_8h.html#a97cda56383fc49167372a11658c80483">TOsclFileOffset</a>  pos)
<a name="l00099"></a>00099         {
<a name="l00100"></a>00100             <span class="keywordflow">return</span> (<a class="code" href="classOsclFileCacheBuffer.html#acec9cae8c4ca826edc9da21fe33b2dd4">filePosition</a> + (<a class="code" href="osclconfig__io_8h.html#a97cda56383fc49167372a11658c80483">TOsclFileOffset</a>)<a class="code" href="classOsclFileCacheBuffer.html#a641b3b437a18f81541ea1722dd8e2085">usableSize</a> &lt;= pos);
<a name="l00101"></a>00101         }
<a name="l00102"></a>00102 };
<a name="l00103"></a>00103 
<a name="l00104"></a>00104 <span class="keyword">class </span><a class="code" href="classOscl__File.html">Oscl_File</a>;
<a name="l00105"></a>00105 
<a name="l00106"></a><a class="code" href="classOsclFileCache.html">00106</a> <span class="keyword">class </span><a class="code" href="classOsclFileCache.html">OsclFileCache</a> : <span class="keyword">public</span> <a class="code" href="classHeapBase.html">HeapBase</a>
<a name="l00107"></a>00107 {
<a name="l00108"></a>00108     <span class="keyword">public</span>:
<a name="l00109"></a>00109         <a class="code" href="classOsclFileCache.html#acee836f63959554befc8a2e5f105d0b7">OsclFileCache</a>(<a class="code" href="classOscl__File.html">Oscl_File</a>&amp; aContainer);
<a name="l00110"></a>00110         <a class="code" href="classOsclFileCache.html#a227e547994ca82f1c59e1f52462aea0d">~OsclFileCache</a>();
<a name="l00111"></a>00111 
<a name="l00112"></a>00112         int32 <a class="code" href="classOsclFileCache.html#a04227c20fc2c9d90aad9df9cf436ae9b">Open</a>(uint32 mode, uint32 cache_size);
<a name="l00113"></a>00113 
<a name="l00114"></a>00114         <span class="keywordtype">void</span> <a class="code" href="classOsclFileCache.html#ac6e9d088eb257ac502b6ca58284fc53d">Close</a>();
<a name="l00115"></a>00115 
<a name="l00116"></a>00116         uint32 <a class="code" href="classOsclFileCache.html#a749e230c4a9006d04378c88842897fde">Read</a>(<span class="keywordtype">void</span>* outputBuffer, uint32 size, uint32 numelements);
<a name="l00117"></a>00117 
<a name="l00118"></a>00118         uint32 <a class="code" href="classOsclFileCache.html#ad3d42ec44b840216bea518cb589ca442">Write</a>(<span class="keyword">const</span> <span class="keywordtype">void</span>* inputBuffer, uint32 size, uint32 numelements);
<a name="l00119"></a>00119 
<a name="l00120"></a><a class="code" href="classOsclFileCache.html#ac94777ae6abbac9b992bbcbc2a355aa1">00120</a>         <a class="code" href="osclconfig__io_8h.html#a97cda56383fc49167372a11658c80483">TOsclFileOffset</a>  <a class="code" href="classOsclFileCache.html#ac94777ae6abbac9b992bbcbc2a355aa1">FileSize</a>()
<a name="l00121"></a>00121         {
<a name="l00122"></a>00122             <span class="keywordflow">return</span> _fileSize;
<a name="l00123"></a>00123         }
<a name="l00124"></a>00124 
<a name="l00125"></a>00125         int32 <a class="code" href="classOsclFileCache.html#a78d7dd121d3ce8cd02b620d8681b6c2a">Seek</a>(<a class="code" href="osclconfig__io_8h.html#a97cda56383fc49167372a11658c80483">TOsclFileOffset</a>  offset, <a class="code" href="classOscl__File.html#a9e509e827a54ae70ad3d37b3ae16b50a">Oscl_File::seek_type</a> origin);
<a name="l00126"></a>00126 
<a name="l00127"></a><a class="code" href="classOsclFileCache.html#aa9f9934cd23153fae66487cc2990f338">00127</a>         <a class="code" href="osclconfig__io_8h.html#a97cda56383fc49167372a11658c80483">TOsclFileOffset</a>  <a class="code" href="classOsclFileCache.html#aa9f9934cd23153fae66487cc2990f338">Tell</a>()
<a name="l00128"></a>00128         {
<a name="l00129"></a>00129             <span class="keywordflow">return</span> (_curCache) ? (_curCache-&gt;<a class="code" href="classOsclFileCacheBuffer.html#acec9cae8c4ca826edc9da21fe33b2dd4">filePosition</a> + _curCache-&gt;<a class="code" href="classOsclFileCacheBuffer.html#a42e94233e6e7c84ccc7646385610cbf8">currentPos</a>) : 0;
<a name="l00130"></a>00130         }
<a name="l00131"></a>00131 
<a name="l00132"></a>00132         int32 <a class="code" href="classOsclFileCache.html#ab0fbcc7b2e58c63ea5f26c74a3f46ee0">Flush</a>();
<a name="l00133"></a>00133 
<a name="l00134"></a><a class="code" href="classOsclFileCache.html#ac7fab155ce0a9e77100f966df6098ae7">00134</a>         int32 <a class="code" href="classOsclFileCache.html#ac7fab155ce0a9e77100f966df6098ae7">EndOfFile</a>()
<a name="l00135"></a>00135         {
<a name="l00136"></a>00136             <span class="keywordflow">return</span> (<a class="code" href="classOsclFileCache.html#aa9f9934cd23153fae66487cc2990f338">Tell</a>() == <a class="code" href="classOsclFileCache.html#ac94777ae6abbac9b992bbcbc2a355aa1">FileSize</a>()) ? 1 : 0;
<a name="l00137"></a>00137         }
<a name="l00138"></a>00138 
<a name="l00139"></a>00139     <span class="keyword">private</span>:
<a name="l00140"></a><a class="code" href="classOsclFileCache.html#a3280256c019228f75b99499164ba9d24">00140</a>         <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classOsclFileCacheBuffer.html">OsclFileCacheBuffer</a>;
<a name="l00141"></a>00141         <a class="code" href="classOscl__File.html">Oscl_File</a>&amp; <a class="code" href="classOsclFileCacheBuffer.html#a037057fbd8670587ed78d5ee0ebd8b1d">iContainer</a>;
<a name="l00142"></a>00142 
<a name="l00143"></a>00143         <span class="comment">//file mode from the Open call.</span>
<a name="l00144"></a>00144         uint32 _mode;
<a name="l00145"></a>00145 
<a name="l00146"></a>00146     <span class="keyword">public</span>:
<a name="l00147"></a><a class="code" href="classOsclFileCache.html#a5cb6f1204051e801ea5985cbc1146d28">00147</a>         <a class="code" href="classOsclFileCacheBuffer.html">OsclFileCacheBuffer</a> <a class="code" href="classOsclFileCache.html#a5cb6f1204051e801ea5985cbc1146d28">_movableCache</a>;
<a name="l00148"></a><a class="code" href="classOsclFileCache.html#a0bca6b43c712361c8387f339c595253a">00148</a>         <a class="code" href="classOscl__Vector.html">Oscl_Vector&lt;OsclFileCacheBuffer, OsclMemAllocator&gt;</a> <a class="code" href="classOsclFileCache.html#a0bca6b43c712361c8387f339c595253a">_fixedCaches</a>;
<a name="l00149"></a>00149         <a class="code" href="osclconfig_8h.html#a6de0f53c5c11f8f53ce72c70d74d9abc">OSCL_IMPORT_REF</a> <a class="code" href="classOsclFileCacheBuffer.html">OsclFileCacheBuffer</a>* <a class="code" href="classOsclFileCache.html#a4718ef811d78b2d9da8ec13cce0ccebe">AddFixedCache</a>(<span class="keyword">const</span> <a class="code" href="classOscl__File_1_1OsclFixedCacheParam.html">Oscl_File::OsclFixedCacheParam</a>&amp;);
<a name="l00150"></a>00150 
<a name="l00151"></a>00151     <span class="keyword">private</span>:
<a name="l00152"></a>00152         <a class="code" href="classOsclFileCacheBuffer.html">OsclFileCacheBuffer</a>* _curCache;
<a name="l00153"></a>00153         int32 SetCachePosition(<a class="code" href="osclconfig__io_8h.html#a97cda56383fc49167372a11658c80483">TOsclFileOffset</a>);
<a name="l00154"></a>00154         int32 UpdateFixedCaches();
<a name="l00155"></a>00155 
<a name="l00156"></a>00156         <span class="comment">//Current file size.  This is a virtual file size and</span>
<a name="l00157"></a>00157         <span class="comment">//may not match the native file size when there is</span>
<a name="l00158"></a>00158         <span class="comment">//cached data.</span>
<a name="l00159"></a>00159         <a class="code" href="osclconfig__io_8h.html#a97cda56383fc49167372a11658c80483">TOsclFileOffset</a>     _fileSize;
<a name="l00160"></a>00160 
<a name="l00161"></a>00161         <span class="comment">//Current true native file position.</span>
<a name="l00162"></a>00162         <a class="code" href="osclconfig__io_8h.html#a97cda56383fc49167372a11658c80483">TOsclFileOffset</a>  _nativePosition;
<a name="l00163"></a>00163 
<a name="l00164"></a>00164         <a class="code" href="classPVLogger.html">PVLogger</a>* iLogger;
<a name="l00165"></a>00165 };
<a name="l00166"></a>00166 
<a name="l00167"></a>00167 
<a name="l00168"></a>00168 <span class="preprocessor">#endif // OSCL_FILE_CACHE_H_INCLUDED</span>
<a name="l00169"></a>00169 <span class="preprocessor"></span>
</pre></div></div>
<hr size="1"><img src="pvlogo_small.jpg"><address style="align: right;"><small>OSCL API</small>
<address style="align: left;"><small>Posting Version: CORE_9.005.1.1 </small>
</small></address>
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