filesys_8c.html

MP3 Player Source Code

00489       
00490       <span class="keywordflow">if</span> (!<a class="code" href="filesys_8h.html#a0">IS_FAT_32</a>){
00491         <span class="comment">//FAT16 get next cluster n</span>
00492         next.<a class="code" href="unionAddress.html#o0">l</a> = <a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o3">Fat16Table</a>[entryNumber];       
00493         <span class="keywordflow">if</span> ((next.<a class="code" href="unionAddress.html#o1">b</a>.<a class="code" href="structAddress_1_1B.html#o1">b1</a>==0xff)&amp;&amp;(next.<a class="code" href="unionAddress.html#o1">b</a>.<a class="code" href="structAddress_1_1B.html#o0">b0</a>==0xff)){
00494           <span class="comment">//FAT16 end-of-file</span>
00495           next.<a class="code" href="unionAddress.html#o1">b</a>.<a class="code" href="structAddress_1_1B.html#o3">b3</a> = 0xff; <span class="comment">//mark end-of-file (FAT32 compatible)</span>
00496         }
00497       }<span class="keywordflow">else</span>{
00498         <span class="comment">//FAT32 get next cluster n</span>
00499         next.<a class="code" href="unionAddress.html#o0">l</a> = <a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o4">Fat32Table</a>[entryNumber];
00500       }
00501     }<span class="comment">//This repeats until there is a discontinuity</span>
00502     
00503     <span class="comment">/* next.l now has the cluster entry for last cluster in fragment</span>
00504 <span class="comment">       it has a high value if eof (see FAT spec) */</span>
00505 
00506     
00507     ConsoleWrite(<span class="stringliteral">"Size: "</span>);
00508     ConsolePutUInt(fragment[c].length);
00509     ConsoleWrite(<span class="stringliteral">"sectors."</span>);
00510 
00511     <span class="comment">//EOF test</span>
00512     <span class="keywordflow">if</span> ((next.<a class="code" href="unionAddress.html#o1">b</a>.<a class="code" href="structAddress_1_1B.html#o3">b3</a>&amp;0x08) <span class="comment">//Quick test</span>
00513         &amp;&amp; ((next.<a class="code" href="unionAddress.html#o0">l</a>&gt;0x0ffffff0) | !<a class="code" href="filesys_8h.html#a0">IS_FAT_32</a>)){ <span class="comment">//Complete test</span>
00514       <span class="comment">//EOF</span>
00515       ConsoleWrite(<span class="stringliteral">" &lt;EOF&gt;\r"</span>);
00516       <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o1">b</a>.<a class="code" href="structAddress_1_1B.html#o3">b3</a> = 0xff;
00517     }<span class="keywordflow">else</span>{
00518       
00519       <span class="comment">//Determine next physical sector for next fragment</span>
00520       <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o0">l</a> = next.<a class="code" href="unionAddress.html#o0">l</a>;
00521       <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o0">l</a> *= <a class="code" href="filesys_8c.html#a5">fatSectorsPerCluster</a>;
00522       <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o0">l</a> += <a class="code" href="filesys_8c.html#a4">dataStart</a>;
00523     }
00524     
00525     c++; <span class="comment">//Advance to next fragment number</span>
00526     
00527     <span class="keywordflow">if</span> (c==<a class="code" href="filesys_8c.html#a0">MAX_NUMBER_FRAGMENTS</a>){
00528       <span class="comment">//End of RAM space allocated for fragment table</span>
00529       <span class="comment">//Force end-of-file</span>
00530       <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o1">b</a>.<a class="code" href="structAddress_1_1B.html#o3">b3</a>=0xff;
00531     }
00532     
00533   }<span class="comment">//break or continue to next cluster</span>
00534   
00535   <span class="keywordflow">return</span> c; <span class="comment">//Return number of fragments;</span>
00536 }
</div></pre>
<p>
Here is the call graph for this function:<p><center><img src="filesys_8c_a19_cgraph.png" border="0" usemap="#filesys_8c_a19_cgraph_map" alt=""></center>
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<a class="anchor" name="a23" doxytag="filesys.c::FatInitGlobals" ></a><p>
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          <td class="md" nowrap valign="top"> unsigned char FatInitGlobals           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap></td>
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<p>
Decipher structure of FAT volume and set globals accordingly. 
<p>

<p>
Definition at line <a class="el" href="filesys_8c-source.html#l00806">806</a> of file <a class="el" href="filesys_8c-source.html">filesys.c</a>.
<p>
References <a class="el" href="unionDiskBlock_1_1Fat_1_1Extensions.html#o0">DiskBlock::Fat::Extensions::_16</a>, <a class="el" href="unionDiskBlock_1_1Fat_1_1Extensions.html#o1">DiskBlock::Fat::Extensions::_32</a>, <a class="el" href="buffer_8h-source.html#l00060">DiskBlock::Fat::BPB_BytsPerSec</a>, <a class="el" href="buffer_8h-source.html#l00067">DiskBlock::Fat::BPB_FATSz16</a>, <a class="el" href="buffer_8h-source.html#l00088">DiskBlock::Fat::Extensions::Fat32Specific::BPB_FATSz32</a>, <a class="el" href="buffer_8h-source.html#l00070">DiskBlock::Fat::BPB_HiddSec</a>, <a class="el" href="buffer_8h-source.html#l00063">DiskBlock::Fat::BPB_NumFATs</a>, <a class="el" href="buffer_8h-source.html#l00064">DiskBlock::Fat::BPB_RootEntCnt</a>, <a class="el" href="buffer_8h-source.html#l00062">DiskBlock::Fat::BPB_RsvdSecCnt</a>, <a class="el" href="buffer_8h-source.html#l00061">DiskBlock::Fat::BPB_SecPerClus</a>, <a class="el" href="buffer_8h-source.html#l00065">DiskBlock::Fat::BPB_TotSec16</a>, <a class="el" href="buffer_8h-source.html#l00071">DiskBlock::Fat::BPB_TotSec32</a>, <a class="el" href="buffer_8h-source.html#l00083">DiskBlock::Fat::Extensions::Fat16Specific::BS_FilSysType</a>, <a class="el" href="buffer_8h-source.html#l00100">DiskBlock::Fat::Extensions::Fat32Specific::BS_FilSysType</a>, <a class="el" href="buffer_8h-source.html#l00058">DiskBlock::Fat::BS_OEMName</a>, <a class="el" href="buffer_8h-source.html#l00082">DiskBlock::Fat::Extensions::Fat16Specific::BS_VolLab</a>, <a class="el" href="buffer_8h-source.html#l00099">DiskBlock::Fat::Extensions::Fat32Specific::BS_VolLab</a>, <a class="el" href="board_8h-source.html#l00235">Temp::c</a>, <a class="el" href="filesys_8c-source.html#l00029">dataStart</a>, <a class="el" href="buffer_8c-source.html#l00010">diskSect</a>, <a class="el" href="structDiskBlock_1_1Fat.html#o14">DiskBlock::Fat::ext</a>, <a class="el" href="unionDiskBlock.html#o0">DiskBlock::fat</a>, <a class="el" href="filesys_8c-source.html#l00032">fatSectorsPerCluster</a>, <a class="el" href="filesys_8c-source.html#l00021">fatStart</a>, <a class="el" href="filesys_8c-source.html#l00068">IS_FAT_12</a>, <a class="el" href="filesys_8h-source.html#l00015">IS_FAT_32</a>, <a class="el" href="buffer_8h-source.html#l00129">Address::l</a>, <a class="el" href="filesys_8c-source.html#l00024">rootStart</a>, <a class="el" href="buffer_8c-source.html#l00015">sectorAddress</a>, and <a class="el" href="board_8c.html#a0">temp</a>.
<p>
Referenced by <a class="el" href="filesys_8c-source.html#l00923">InitFileSystem()</a>.
<p>
<pre class="fragment"><div>00806                               {
00807 
00808   ConsoleWrite(<span class="stringliteral">"Formatter signature:"</span>);
00809   <span class="keywordflow">for</span> (<a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o0">c</a>=0; <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o0">c</a>&lt;8; <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o0">c</a>++){
00810     ConsolePutChar(<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o1">BS_OEMName</a>[<a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o0">c</a>]);
00811   }
00812   ConsoleWrite(<span class="stringliteral">"\rBytes per sector: "</span>);
00813   ConsolePutUInt(<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o2">BPB_BytsPerSec</a>);
00814   ConsoleWrite(<span class="stringliteral">"\rSectors per Cluster: "</span>);
00815   ConsolePutUInt(<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o3">BPB_SecPerClus</a>);
00816   ConsoleWrite(<span class="stringliteral">"\rReserved sectors: "</span>);
00817   ConsolePutUInt(<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o4">BPB_RsvdSecCnt</a>);
00818   ConsoleWrite(<span class="stringliteral">"\rNumber of FATs: "</span>);
00819   ConsolePutUInt(<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o5">BPB_NumFATs</a>);
00820   ConsoleWrite(<span class="stringliteral">"\rRoot entries: "</span>);
00821   ConsolePutUInt(<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o6">BPB_RootEntCnt</a>);
00822   ConsoleWrite(<span class="stringliteral">"\rTotal Sectors 16: "</span>);
00823   ConsolePutUInt(<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o7">BPB_TotSec16</a>);
00824   ConsoleWrite(<span class="stringliteral">"\rFat Size 16: "</span>);
00825   ConsolePutUInt(<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o9">BPB_FATSz16</a>);
00826   ConsoleWrite(<span class="stringliteral">"\rHidden Sectors: "</span>);
00827   ConsolePutUInt(<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o12">BPB_HiddSec</a>);
00828   ConsoleWrite(<span class="stringliteral">"\rTotal Sectors 32: "</span>);
00829   ConsolePutUInt(<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o13">BPB_TotSec32</a>);
00830   
00831 
00832 
00833   <span class="comment">/* Determine FAT Type (16/32) */</span>
00834   <span class="comment">/* This should be done better, but it'll do for now. */</span>
00835   <a class="code" href="filesys_8h.html#a0">IS_FAT_32</a> = 1;
00836   <span class="keywordflow">if</span> (<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o6">BPB_RootEntCnt</a>) 
00837     <a class="code" href="filesys_8h.html#a0">IS_FAT_32</a> = 0; <span class="comment">/* FAT32 does not have separate root entries. */</span>
00838   
00839   ConsoleWrite(<span class="stringliteral">"\rFile system is "</span>);
00840   <span class="keywordflow">if</span> (<a class="code" href="filesys_8h.html#a0">IS_FAT_32</a>){
00841     ConsoleWrite(<span class="stringliteral">"FAT32"</span>);
00842   } <span class="keywordflow">else</span> {
00843     ConsoleWrite(<span class="stringliteral">"FAT16"</span>);
00844   }
00845 
00846   ConsoleWrite(<span class="stringliteral">"\rFile system signature is "</span>);
00847   <span class="keywordflow">for</span> (<a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o0">c</a>=0;<a class="code" href="board_8c.html#a0">temp</a>. c&lt;8; <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o0">c</a>++)
00848     <span class="keywordflow">if</span> (<a class="code" href="filesys_8h.html#a0">IS_FAT_32</a>){
00849       ConsolePutChar(<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o14">ext</a>.<a class="code" href="unionDiskBlock_1_1Fat_1_1Extensions.html#o1">_32</a>.<a class="code" href="structDiskBlock_1_1Fat_1_1Extensions_1_1Fat32Specific.html#o12">BS_FilSysType</a>[<a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o0">c</a>]);
00850     } <span class="keywordflow">else</span> {
00851       ConsolePutChar(<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o14">ext</a>.<a class="code" href="unionDiskBlock_1_1Fat_1_1Extensions.html#o0">_16</a>.<a class="code" href="structDiskBlock_1_1Fat_1_1Extensions_1_1Fat16Specific.html#o5">BS_FilSysType</a>[<a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o0">c</a>]);
00852     }
00853 
00854   <span class="keywordflow">if</span> (!<a class="code" href="filesys_8h.html#a0">IS_FAT_32</a>){
00855     <span class="keywordflow">if</span> (<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o14">ext</a>.<a class="code" href="unionDiskBlock_1_1Fat_1_1Extensions.html#o0">_16</a>.<a class="code" href="structDiskBlock_1_1Fat_1_1Extensions_1_1Fat16Specific.html#o5">BS_FilSysType</a>[4]==<span class="charliteral">'2'</span>){
00856       <a class="code" href="filesys_8c.html#a12">IS_FAT_12</a> = 1;
00857       ConsoleWrite(<span class="stringliteral">"Well, actually it's FAT12 filesystem.\r"</span>);
00858     }
00859   }    
00860   
00861 
00862   ConsoleWrite(<span class="stringliteral">"\rVolume Label is "</span>);
00863   <span class="keywordflow">for</span> (<a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o0">c</a>=0; <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o0">c</a>&lt;11; <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o0">c</a>++)
00864     <span class="keywordflow">if</span> (<a class="code" href="filesys_8h.html#a0">IS_FAT_32</a>){
00865       ConsolePutChar(<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o14">ext</a>.<a class="code" href="unionDiskBlock_1_1Fat_1_1Extensions.html#o1">_32</a>.<a class="code" href="structDiskBlock_1_1Fat_1_1Extensions_1_1Fat32Specific.html#o11">BS_VolLab</a>[<a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o0">c</a>]);
00866     } <span class="keywordflow">else</span> {
00867       ConsolePutChar(<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o0">fat</a>.<a class="code" href="structDiskBlock_1_1Fat.html#o14">ext</a>.<a class="code" href="unionDiskBlock_1_1Fat_1_1Extensions.html#o0">_16</a>.<a class="code" href="structDiskBlock_1_1Fat_1_1Extensions_1_1Fat16Specific.html#o4">BS_VolLab</a>[<a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o0">c</a>]);
00868     }