fat_8c-source.html

avr应用测试程序

00326             }
00327             <span class="comment">// TODO: handle pathname properly for going up a directory</span>
00328             <span class="comment">// set path string</span>
00329             strcat(PathNameBuffer, FileNameBuffer);
00330             strcat(PathNameBuffer, <span class="stringliteral">"\\"</span>);
00331             <span class="comment">// return success</span>
00332             <span class="keywordflow">return</span> TRUE;
00333         }
00334         <span class="keywordflow">else</span>
00335         {
00336             <span class="comment">// not a directory, cannot CD into a file!</span>
00337             <span class="keywordflow">return</span> FALSE;
00338         }
00339     }
00340     <span class="keywordflow">else</span>
00341     {
00342         <span class="comment">// not a valid entry, cannot CD!</span>
00343         <span class="keywordflow">return</span> FALSE;
00344     }
00345 }
00346 
00347 <span class="keywordtype">void</span> fatPrintDirEntry(<span class="keywordtype">void</span>)
00348 {
00349     <span class="comment">// print a formatted dir-style output for most recent file</span>
00350     <span class="comment">// print date</span>
00351     <a class="code" href="group__rprintf.html#ga10">rprintfNum</a>(10, 2, FALSE, <span class="charliteral">'0'</span>, (FileInfo.CreateDate&amp;DD_MONTH_MASK)&gt;&gt;DD_MONTH_SHIFT );    <span class="comment">// month</span>
00352     <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">'/'</span>);
00353     <a class="code" href="group__rprintf.html#ga10">rprintfNum</a>(10, 2, FALSE, <span class="charliteral">'0'</span>, (FileInfo.CreateDate&amp;DD_DAY_MASK)&gt;&gt;DD_DAY_SHIFT );        <span class="comment">// day</span>
00354     <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">'/'</span>);
00355     <a class="code" href="group__rprintf.html#ga10">rprintfNum</a>(10, 4, FALSE, <span class="charliteral">'0'</span>, (FileInfo.CreateDate&amp;DD_YEAR_MASK)&gt;&gt;DD_YEAR_SHIFT );  <span class="comment">// year</span>
00356     <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">' '</span>);
00357 
00358     <span class="comment">// print time</span>
00359     <a class="code" href="group__rprintf.html#ga10">rprintfNum</a>(10, 2, FALSE, <span class="charliteral">'0'</span>, (FileInfo.CreateTime&amp;DT_HOURS_MASK)&gt;&gt;DT_HOURS_SHIFT );    <span class="comment">// month</span>
00360     <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">':'</span>);
00361     <a class="code" href="group__rprintf.html#ga10">rprintfNum</a>(10, 2, FALSE, <span class="charliteral">'0'</span>, (FileInfo.CreateTime&amp;DT_MINUTES_MASK)&gt;&gt;DT_MINUTES_SHIFT );        <span class="comment">// day</span>
00362     <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">':'</span>);
00363     <a class="code" href="group__rprintf.html#ga10">rprintfNum</a>(10, 2, FALSE, <span class="charliteral">'0'</span>, 2*(FileInfo.CreateTime&amp;DT_2SECONDS_MASK)&gt;&gt;DT_2SECONDS_SHIFT );    <span class="comment">// seconds</span>
00364     <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">' '</span>);
00365 
00366     <span class="comment">// print attributes</span>
00367     <span class="keywordflow">if</span>(FileInfo.Attr &amp; ATTR_VOLUME)     <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">'V'</span>); <span class="keywordflow">else</span> <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">'-'</span>);
00368     <span class="keywordflow">if</span>(FileInfo.Attr &amp; ATTR_DIRECTORY)  <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">'D'</span>); <span class="keywordflow">else</span> <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">'-'</span>);
00369     <span class="keywordflow">if</span>(FileInfo.Attr &amp; ATTR_READONLY)   <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">'R'</span>); <span class="keywordflow">else</span> <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">'-'</span>);
00370     <span class="keywordflow">if</span>(FileInfo.Attr &amp; ATTR_HIDDEN)     <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">'H'</span>); <span class="keywordflow">else</span> <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">'-'</span>);
00371     <span class="keywordflow">if</span>(FileInfo.Attr &amp; ATTR_SYSTEM)     <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">'S'</span>); <span class="keywordflow">else</span> <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">'-'</span>);
00372     <span class="keywordflow">if</span>(FileInfo.Attr &amp; ATTR_ARCHIVE)    <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">'A'</span>); <span class="keywordflow">else</span> <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">'-'</span>);
00373     <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">' '</span>);
00374 
00375     <span class="comment">// print filesize</span>
00376     <a class="code" href="group__rprintf.html#ga10">rprintfNum</a>(10, 8, FALSE, <span class="charliteral">' '</span>, FileInfo.Size);   <span class="comment">// filesize</span>
00377     <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(<span class="charliteral">' '</span>);
00378 
00379     <span class="comment">// print filename</span>
00380     <a class="code" href="group__rprintf.html#ga2">rprintfStr</a>(FileNameBuffer);
00381 }
00382 
00383 <span class="keywordtype">void</span> fatDumpDirSlot(<span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> slot)
00384 {
00385     <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> sector;
00386     <span class="comment">// load correct sector</span>
00387     sector = fatClustToSect(CurrentDirStartCluster);
00388     sector += slot/DIRENTRIES_PER_SECTOR;
00389     <span class="comment">// print the entry as a hex table</span>
00390     <a class="code" href="debug_8c.html#a0">debugPrintHexTable</a>(32, SectorBuffer+(slot&lt;&lt;5) );
00391 }
00392 
00393 <span class="keyword">struct </span>FileInfoStruct* fatGetFileInfo(<span class="keywordtype">void</span>)
00394 {
00395     <span class="keywordflow">return</span> &amp;FileInfo;
00396 }
00397 
00398 <span class="comment">// return the size of the last directory entry</span>
00399 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> fatGetFilesize(<span class="keywordtype">void</span>)
00400 {
00401     <span class="keywordflow">return</span> FileInfo.Size;
00402 }
00403 
00404 <span class="comment">// return the long name of the last directory entry</span>
00405 <span class="keywordtype">char</span>* fatGetFilename(<span class="keywordtype">void</span>)
00406 {   
00407     <span class="keywordflow">return</span> FileNameBuffer;
00408 }
00409 
00410 <span class="comment">// return the directory of the last directory entry</span>
00411 <span class="keywordtype">char</span>* fatGetDirname(<span class="keywordtype">void</span>)
00412 {   
00413     <span class="keywordflow">return</span> PathNameBuffer;
00414 }
00415 
00416 <span class="comment">// load a clusterfull of data</span>
00417 <span class="keywordtype">void</span> fatLoadCluster(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> cluster, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *buffer)
00418 {
00419     <span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> i;
00420     <span class="comment">// read cluster</span>
00421     <span class="comment">//while ( ataReadSectors( DRIVE0, clust2sect(cluster), SectorsPerCluster, buffer) != 0);</span>
00422     <span class="keywordflow">for</span>(i=0; i&lt;SectorsPerCluster; i++)
00423     {
00424         ataReadSectors( DRIVE0, fatClustToSect(cluster)+i, 1, buffer+(i&lt;&lt;9) );
00425         <span class="comment">// temporary fix for wierd misaligned cluster problem</span>
00426         <span class="comment">// (only when using FAT16?)</span>
00427 <span class="comment">//      ataReadSectors( DRIVE0, fatClustToSect(cluster+8)+i, 1, buffer+(i&lt;&lt;9) );</span>
00428     }
00429 }
00430 
00431 
00432 <span class="comment">// find next cluster in the FAT chain</span>
00433 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> fatNextCluster(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> cluster)
00434 {
00435     <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> nextCluster;
00436     <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> fatMask;
00437     <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> fatOffset;
00438     <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> sector;
00439     <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> offset;
00440     
00441     <span class="comment">// get fat offset in bytes</span>
00442     <span class="keywordflow">if</span>(Fat32Enabled)
00443     {
00444         <span class="comment">// four FAT bytes (32 bits) for every cluster</span>
00445         fatOffset = cluster &lt;&lt; 2;
00446         <span class="comment">// set the FAT bit mask</span>
00447         fatMask = FAT32_MASK;
00448     }
00449     <span class="keywordflow">else</span>
00450     {
00451         <span class="comment">// two FAT bytes (16 bits) for every cluster</span>
00452         fatOffset = cluster &lt;&lt; 1;
00453         <span class="comment">// set the FAT bit mask</span>
00454         fatMask = FAT16_MASK;
00455     }
00456     
00457     <span class="comment">// calculate the FAT sector that we're interested in</span>
00458     sector = FirstFATSector + (fatOffset / BytesPerSector);
00459     <span class="comment">// calculate offset of the our entry within that FAT sector</span>
00460     offset = fatOffset % BytesPerSector;
00461 
00462     <span class="comment">// if we don't already have this FAT chunk loaded, go get it</span>
00463     <span class="keywordflow">if</span> (sector != FatInCache)
00464     {
00465         <span class="comment">// read sector of FAT table</span>
00466         <span class="keywordflow">while</span> (ataReadSectors( DRIVE0, sector, 1, (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*)FAT_CACHE_ADDR) != 0);
00467         FatInCache = sector;
00468     }
00469 
00470     <span class="comment">// read the nextCluster value</span>
00471     nextCluster = (*((<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>*) &amp;((<span class="keywordtype">char</span>*)FAT_CACHE_ADDR)[offset])) &amp; fatMask;
00472 
00473     <span class="comment">// check to see if we're at the end of the chain</span>
00474     <span class="keywordflow">if</span> (nextCluster == (CLUST_EOFE &amp; fatMask))
00475         nextCluster = 0;
00476 
00477 <span class="preprocessor">#ifdef DEBUG_FAT</span>
00478 <span class="preprocessor"></span>    <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"&gt;"</span>);
00479     <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(nextCluster);
00480     <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();
00481 <span class="preprocessor">#endif</span>
00482 <span class="preprocessor"></span>    
00483     <span class="keywordflow">return</span> nextCluster;
00484 }
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