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ZealOS/docs/Kernel/BlkDev/DiskCFile.CC.html
TomAwezome 293db76ddb Update documentation.
2021-10-27 03:28:16 -04:00

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<a name="l1"></a><span class=cF9>I64</span><span class=cF0> </span><span class=cF5>FSize</span><span class=cF0>(</span><span class=cF9>CFile</span><span class=cF0> *f)
<a name="l2"></a>{</span><span class=cF2>//Report size of opened file in bytes.</span><span class=cF0>
<a name="l3"></a> </span><span class=cF1>if</span><span class=cF0> (f)
<a name="l4"></a> </span><span class=cF1>return</span><span class=cF0> f-&gt;de.size;
<a name="l5"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l6"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l7"></a>}
<a name="l8"></a>
<a name="l9"></a></span><span class=cF9>CFile</span><span class=cF0> *</span><span class=cF5>FOpen</span><span class=cF0>(</span><span class=cF1>U8</span><span class=cF0> *filename, </span><span class=cF1>U8</span><span class=cF0> *flags, </span><span class=cF9>I64</span><span class=cF0> count=</span><span class=cFE>0</span><span class=cF0>)
<a name="l10"></a>{</span><span class=cF2>//Allows flags &quot;r&quot;,&quot;w&quot;,&quot;w+&quot;. &quot;c&quot; for contiguous.</span><span class=cF0>
<a name="l11"></a></span><span class=cF2>//(It uses </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/StrA.CC.html#l457"><span class=cF4>StrOcc</span></a><span class=cF2>() for 'w', 'r', '+', 'c')</span><span class=cF0>
<a name="l12"></a> </span><span class=cF9>CFile</span><span class=cF0> *f = </span><span class=cF5>CAlloc</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF9>CFile</span><span class=cF7>)</span><span class=cF0>);
<a name="l13"></a> </span><span class=cF9>CDirContext</span><span class=cF0> *dirc;
<a name="l14"></a> </span><span class=cF1>U8</span><span class=cF0> *full_name;
<a name="l15"></a> </span><span class=cF1>Bool</span><span class=cF0> contiguous = </span><span class=cF5>StrOcc</span><span class=cF0>(flags, </span><span class=cF6>'c'</span><span class=cF0>);
<a name="l16"></a>
<a name="l17"></a> f-&gt;clus = </span><span class=cF3>INVALID_CLUS</span><span class=cF0>;
<a name="l18"></a> f-&gt;fblk_num = </span><span class=cFE>0</span><span class=cF0>;
<a name="l19"></a> </span><span class=cF1>if</span><span class=cF0> (count &gt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l20"></a> f-&gt;max_blk = count - </span><span class=cFE>1</span><span class=cF0>;
<a name="l21"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l22"></a> f-&gt;max_blk = </span><span class=cF3>I64_MAX</span><span class=cF0>;
<a name="l23"></a> f-&gt;file_clus_num = </span><span class=cF3>INVALID_CLUS</span><span class=cF0>;
<a name="l24"></a> full_name = </span><span class=cF5>FileNameAbs</span><span class=cF0>(filename);
<a name="l25"></a> f-&gt;drive = </span><span class=cF5>Letter2Drive</span><span class=cF0>(*full_name);
<a name="l26"></a> </span><span class=cF1>if</span><span class=cF0> (f-&gt;drive-&gt;fs_type == </span><span class=cF3>FSt_REDSEA</span><span class=cF0>)
<a name="l27"></a> contiguous = </span><span class=cF3>TRUE</span><span class=cF0>;
<a name="l28"></a> </span><span class=cF1>if</span><span class=cF0> (contiguous)
<a name="l29"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l30"></a> f-&gt;flags |= </span><span class=cF3>FF_CONTIGUOUS</span><span class=cF0>;
<a name="l31"></a> </span><span class=cF1>if</span><span class=cF0> (f-&gt;drive-&gt;fs_type != </span><span class=cF3>FSt_REDSEA</span><span class=cF0> &amp;&amp; !</span><span class=cF7>(</span><span class=cF5>FileAttr</span><span class=cF0>(filename) &amp; </span><span class=cF3>RS_ATTR_CONTIGUOUS</span><span class=cF7>)</span><span class=cF0>)
<a name="l32"></a> </span><span class=cF5>throw</span><span class=cF0>(</span><span class=cF6>'File'</span><span class=cF0>);
<a name="l33"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l34"></a> f-&gt;clus_buf = </span><span class=cF5>CAlloc</span><span class=cF0>(f-&gt;drive-&gt;spc &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>);
<a name="l35"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cF5>StrOcc</span><span class=cF7>(</span><span class=cF0>flags, </span><span class=cF6>'w'</span><span class=cF7>)</span><span class=cF0>)
<a name="l36"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l37"></a> f-&gt;flags = f-&gt;flags | </span><span class=cF3>FF_WRITE</span><span class=cF0> | </span><span class=cF3>FF_NEEDS_WRITE</span><span class=cF0>;
<a name="l38"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cF5>StrOcc</span><span class=cF7>(</span><span class=cF0>flags, </span><span class=cF6>'+'</span><span class=cF7>)</span><span class=cF0>)
<a name="l39"></a> {
<a name="l40"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cF5>FileFind</span><span class=cF7>(</span><span class=cF0>full_name, &amp;f-&gt;de, </span><span class=cF3>FUF_JUST_FILES</span><span class=cF7>)</span><span class=cF0>)
<a name="l41"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l42"></a> </span><span class=cF5>Free</span><span class=cF0>(full_name);
<a name="l43"></a> </span><span class=cF1>if</span><span class=cF0> (contiguous)
<a name="l44"></a> f-&gt;max_blk = (</span><span class=cF5>FSize</span><span class=cF7>(</span><span class=cF0>f</span><span class=cF7>)</span><span class=cF0> + </span><span class=cF3>BLK_SIZE</span><span class=cF0> - </span><span class=cFE>1</span><span class=cF0>) &gt;&gt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0> - </span><span class=cFE>1</span><span class=cF0>;
<a name="l45"></a> </span><span class=cF1>return</span><span class=cF0> f;
<a name="l46"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l47"></a> }
<a name="l48"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l49"></a> </span><span class=cF5>Del</span><span class=cF0>(full_name,,, </span><span class=cF3>FALSE</span><span class=cF0>);
<a name="l50"></a> f-&gt;de.full_name = full_name;
<a name="l51"></a> f-&gt;flags |= </span><span class=cF3>FF_NEW_FILE</span><span class=cF0>;
<a name="l52"></a> </span><span class=cF1>if</span><span class=cF0> (dirc = </span><span class=cF5>DirContextNew</span><span class=cF7>(</span><span class=cF0>full_name</span><span class=cF7>)</span><span class=cF0>)
<a name="l53"></a> {
<a name="l54"></a> </span><span class=cF5>StrCopy</span><span class=cF0>(f-&gt;de.name, dirc-&gt;mask);
<a name="l55"></a> </span><span class=cF1>if</span><span class=cF0> (count &gt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l56"></a> </span><span class=cF7>{</span><span class=cF2>//We pre-alloc the whole thing.</span><span class=cF0>
<a name="l57"></a> f-&gt;de.clus = </span><span class=cF5>ClusAlloc</span><span class=cF0>(f-&gt;drive,</span><span class=cFE>0</span><span class=cF0>, </span><span class=cF7>(</span><span class=cF0>count + f-&gt;drive-&gt;spc - </span><span class=cFE>1</span><span class=cF7>)</span><span class=cF0> / f-&gt;drive-&gt;spc, contiguous);
<a name="l58"></a> f-&gt;de.size = count &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>;
<a name="l59"></a> </span><span class=cF5>DirNew</span><span class=cF0>(dirc-&gt;drive, </span><span class=cF5>Fs</span><span class=cF0>-&gt;cur_dir, &amp;f-&gt;de, </span><span class=cF3>TRUE</span><span class=cF0>);
<a name="l60"></a> f-&gt;flags &amp;= ~</span><span class=cF3>FF_NEW_FILE</span><span class=cF0>;
<a name="l61"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l62"></a> </span><span class=cF5>DirContextDel</span><span class=cF0>(dirc);
<a name="l63"></a> </span><span class=cF1>return</span><span class=cF0> f;
<a name="l64"></a> }
<a name="l65"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l66"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l67"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l68"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cF5>FileFind</span><span class=cF7>(</span><span class=cF0>full_name, &amp;f-&gt;de, </span><span class=cF3>FUF_JUST_FILES</span><span class=cF7>)</span><span class=cF0>)
<a name="l69"></a> {
<a name="l70"></a> </span><span class=cF5>Free</span><span class=cF0>(full_name);
<a name="l71"></a> f-&gt;max_blk = (</span><span class=cF5>FSize</span><span class=cF7>(</span><span class=cF0>f</span><span class=cF7>)</span><span class=cF0> + </span><span class=cF3>BLK_SIZE</span><span class=cF0> - </span><span class=cFE>1</span><span class=cF0>) &gt;&gt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0> - </span><span class=cFE>1</span><span class=cF0>;
<a name="l72"></a> </span><span class=cF1>return</span><span class=cF0> f;
<a name="l73"></a> }
<a name="l74"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l75"></a> </span><span class=cF5>Free</span><span class=cF0>(f-&gt;clus_buf);
<a name="l76"></a> </span><span class=cF5>Free</span><span class=cF0>(full_name);
<a name="l77"></a> </span><span class=cF5>Free</span><span class=cF0>(f);
<a name="l78"></a>
<a name="l79"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l80"></a>}
<a name="l81"></a>
<a name="l82"></a></span><span class=cF1>U0</span><span class=cF0> </span><span class=cF5>FClose</span><span class=cF0>(</span><span class=cF9>CFile</span><span class=cF0> *f)
<a name="l83"></a>{</span><span class=cF2>//Close CFile, updating directory.</span><span class=cF0>
<a name="l84"></a> </span><span class=cF9>CDirContext</span><span class=cF0> *dirc;
<a name="l85"></a>
<a name="l86"></a> </span><span class=cF1>if</span><span class=cF0> (f)
<a name="l87"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l88"></a> </span><span class=cF1>if</span><span class=cF0> (f-&gt;flags &amp; </span><span class=cF3>FF_BUF_DIRTY</span><span class=cF0>)
<a name="l89"></a> {
<a name="l90"></a> </span><span class=cF5>ClusWrite</span><span class=cF0>(f-&gt;drive, f-&gt;clus_buf, f-&gt;clus, </span><span class=cFE>1</span><span class=cF0>);
<a name="l91"></a> f-&gt;flags &amp;= ~</span><span class=cF3>FF_BUF_DIRTY</span><span class=cF0>;
<a name="l92"></a> }
<a name="l93"></a> </span><span class=cF1>if</span><span class=cF0> (f-&gt;flags &amp; </span><span class=cF3>FF_NEEDS_WRITE</span><span class=cF0>)
<a name="l94"></a> {
<a name="l95"></a> </span><span class=cF1>if</span><span class=cF0> (dirc = </span><span class=cF5>DirContextNew</span><span class=cF7>(</span><span class=cF0>f-&gt;de.full_name</span><span class=cF7>)</span><span class=cF0>)
<a name="l96"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l97"></a> </span><span class=cF1>if</span><span class=cF0> (!</span><span class=cF7>(</span><span class=cF0>f-&gt;flags &amp; </span><span class=cF3>FF_USE_OLD_DATETIME</span><span class=cF7>)</span><span class=cF0>)
<a name="l98"></a> f-&gt;de.datetime = </span><span class=cF5>Now</span><span class=cF0>;
<a name="l99"></a> </span><span class=cF1>if</span><span class=cF0> (f-&gt;flags &amp; </span><span class=cF3>FF_NEW_FILE</span><span class=cF0>)
<a name="l100"></a> </span><span class=cF5>DirNew</span><span class=cF0>(dirc-&gt;drive, </span><span class=cF5>Fs</span><span class=cF0>-&gt;cur_dir, &amp;f-&gt;de, </span><span class=cF3>TRUE</span><span class=cF0>);
<a name="l101"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l102"></a> </span><span class=cF5>DirNew</span><span class=cF0>(dirc-&gt;drive, </span><span class=cF5>Fs</span><span class=cF0>-&gt;cur_dir, &amp;f-&gt;de, </span><span class=cF3>FALSE</span><span class=cF0>);
<a name="l103"></a> </span><span class=cF5>DirContextDel</span><span class=cF0>(dirc);
<a name="l104"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l105"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l106"></a> </span><span class=cF5>throw</span><span class=cF0>(</span><span class=cF6>'File'</span><span class=cF0>);
<a name="l107"></a> }
<a name="l108"></a> </span><span class=cF5>Free</span><span class=cF0>(f-&gt;clus_buf);
<a name="l109"></a> </span><span class=cF5>Free</span><span class=cF0>(f-&gt;de.full_name);
<a name="l110"></a> </span><span class=cF5>Free</span><span class=cF0>(f);
<a name="l111"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l112"></a>}
<a name="l113"></a>
<a name="l114"></a></span><span class=cF9>I64</span><span class=cF0> </span><span class=cFD>FSetClus</span><span class=cF0>(</span><span class=cF9>CFile</span><span class=cF0> *f, </span><span class=cF9>I64</span><span class=cF0> c, </span><span class=cF9>I64</span><span class=cF0> blk, </span><span class=cF1>Bool</span><span class=cF0> read)
<a name="l115"></a>{
<a name="l116"></a> </span><span class=cF9>CDrive</span><span class=cF0> *drive = f-&gt;drive;
<a name="l117"></a> </span><span class=cF9>I64</span><span class=cF0> i;
<a name="l118"></a>
<a name="l119"></a> </span><span class=cF1>if</span><span class=cF0> (f-&gt;clus != c)
<a name="l120"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l121"></a> </span><span class=cF1>if</span><span class=cF0> (f-&gt;flags &amp; </span><span class=cF3>FF_BUF_DIRTY</span><span class=cF0>)
<a name="l122"></a> {
<a name="l123"></a> i = drive-&gt;spc;
<a name="l124"></a> </span><span class=cF1>if</span><span class=cF0> (f-&gt;max_blk != </span><span class=cF3>I64_MAX</span><span class=cF0>)
<a name="l125"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l126"></a> i = f-&gt;max_blk + </span><span class=cFE>1</span><span class=cF0> - f-&gt;file_clus_num * drive-&gt;spc;
<a name="l127"></a> </span><span class=cF1>if</span><span class=cF0> (i &gt; drive-&gt;spc)
<a name="l128"></a> i = drive-&gt;spc;
<a name="l129"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l130"></a> </span><span class=cF5>ClusBlkWrite</span><span class=cF0>(drive, f-&gt;clus_buf, f-&gt;clus, i);
<a name="l131"></a> f-&gt;flags = f-&gt;flags &amp; ~</span><span class=cF3>FF_BUF_DIRTY</span><span class=cF0>;
<a name="l132"></a> }
<a name="l133"></a> f-&gt;clus = c;
<a name="l134"></a> f-&gt;file_clus_num = blk / drive-&gt;spc;
<a name="l135"></a> </span><span class=cF1>if</span><span class=cF0> (read)
<a name="l136"></a> {
<a name="l137"></a> i = drive-&gt;spc;
<a name="l138"></a> </span><span class=cF1>if</span><span class=cF0> (f-&gt;max_blk != </span><span class=cF3>I64_MAX</span><span class=cF0>)
<a name="l139"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l140"></a> i = f-&gt;max_blk + </span><span class=cFE>1</span><span class=cF0> - f-&gt;file_clus_num * drive-&gt;spc;
<a name="l141"></a> </span><span class=cF1>if</span><span class=cF0> (i &gt; drive-&gt;spc)
<a name="l142"></a> i = drive-&gt;spc;
<a name="l143"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l144"></a> c = </span><span class=cF5>ClusBlkRead</span><span class=cF0>(drive, f-&gt;clus_buf, c, i);
<a name="l145"></a> }
<a name="l146"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l147"></a>
<a name="l148"></a> </span><span class=cF1>return</span><span class=cF0> c;
<a name="l149"></a>}
<a name="l150"></a>
<a name="l151"></a></span><span class=cF1>Bool</span><span class=cF0> </span><span class=cF5>FBlkRead</span><span class=cF0>(</span><span class=cF9>CFile</span><span class=cF0> *f, </span><span class=cF1>U8</span><span class=cF0> *buf, </span><span class=cF9>I64</span><span class=cF0> blk=</span><span class=cF3>FFB_NEXT_BLK</span><span class=cF0>, </span><span class=cF9>I64</span><span class=cF0> count=</span><span class=cFE>1</span><span class=cF0>)
<a name="l152"></a>{</span><span class=cF2>//Read [nth,n+count) blocks of file.</span><span class=cF0>
<a name="l153"></a> </span><span class=cF9>CDrive</span><span class=cF0> *drive = f-&gt;drive;
<a name="l154"></a> </span><span class=cF9>I64</span><span class=cF0> spc = drive-&gt;spc, i, j, c = f-&gt;de.clus;
<a name="l155"></a>
<a name="l156"></a> </span><span class=cF1>if</span><span class=cF0> (!f || !drive)
<a name="l157"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>FALSE</span><span class=cF0>;
<a name="l158"></a> </span><span class=cF1>if</span><span class=cF0> (blk == </span><span class=cF3>FFB_NEXT_BLK</span><span class=cF0>)
<a name="l159"></a> blk = f-&gt;fblk_num;
<a name="l160"></a> </span><span class=cF1>if</span><span class=cF0> (blk + count - </span><span class=cFE>1</span><span class=cF0> &gt; f-&gt;max_blk)
<a name="l161"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>FALSE</span><span class=cF0>;
<a name="l162"></a> </span><span class=cF1>if</span><span class=cF0> (count &lt;= </span><span class=cFE>0</span><span class=cF0>)
<a name="l163"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>TRUE</span><span class=cF0>;
<a name="l164"></a>
<a name="l165"></a> </span><span class=cF1>if</span><span class=cF0> (f-&gt;flags &amp; </span><span class=cF3>FF_CONTIGUOUS</span><span class=cF0>)
<a name="l166"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l167"></a> </span><span class=cF5>BlkRead</span><span class=cF0>(drive, buf, </span><span class=cF5>Clus2Blk</span><span class=cF7>(</span><span class=cF0>drive, c</span><span class=cF7>)</span><span class=cF0> + blk, count);
<a name="l168"></a> blk += count;
<a name="l169"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l170"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l171"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l172"></a> i = blk / spc;
<a name="l173"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cFE>0</span><span class=cF0> &lt;= f-&gt;file_clus_num &lt;= i)
<a name="l174"></a> {
<a name="l175"></a> c = f-&gt;clus;
<a name="l176"></a> i -= f-&gt;file_clus_num;
<a name="l177"></a> }
<a name="l178"></a> </span><span class=cF1>if</span><span class=cF0> (i &gt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l179"></a> c = </span><span class=cF5>ClusNumNext</span><span class=cF0>(drive, c, i);
<a name="l180"></a>
<a name="l181"></a> </span><span class=cF1>if</span><span class=cF0> (i = blk % spc)
<a name="l182"></a> {
<a name="l183"></a> c = </span><span class=cFD>FSetClus</span><span class=cF0>(f, c, blk, </span><span class=cF3>TRUE</span><span class=cF0>);
<a name="l184"></a> </span><span class=cF1>if</span><span class=cF0> (count &lt; spc - i)
<a name="l185"></a> j = count;
<a name="l186"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l187"></a> j = spc - i;
<a name="l188"></a> </span><span class=cF5>MemCopy</span><span class=cF0>(buf, f-&gt;clus_buf + i &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>, j &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>);
<a name="l189"></a> buf += j &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>;
<a name="l190"></a> count -= j;
<a name="l191"></a> blk += j;
<a name="l192"></a> }
<a name="l193"></a> </span><span class=cF1>while</span><span class=cF0> (count &gt;= spc)
<a name="l194"></a> {
<a name="l195"></a> c = </span><span class=cFD>FSetClus</span><span class=cF0>(f, c, blk, </span><span class=cF3>TRUE</span><span class=cF0>);
<a name="l196"></a> </span><span class=cF5>MemCopy</span><span class=cF0>(buf, f-&gt;clus_buf, spc &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>);
<a name="l197"></a> buf += spc &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>;
<a name="l198"></a> count -= spc;
<a name="l199"></a> blk += spc;
<a name="l200"></a> }
<a name="l201"></a> </span><span class=cF1>if</span><span class=cF0> (count &gt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l202"></a> {
<a name="l203"></a> c = </span><span class=cFD>FSetClus</span><span class=cF0>(f, c, blk, </span><span class=cF3>TRUE</span><span class=cF0>);
<a name="l204"></a> </span><span class=cF5>MemCopy</span><span class=cF0>(buf, f-&gt;clus_buf, count &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>);
<a name="l205"></a> buf += count&lt;&lt;</span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>;
<a name="l206"></a> blk += count;
<a name="l207"></a> }
<a name="l208"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l209"></a> f-&gt;fblk_num = blk;
<a name="l210"></a>
<a name="l211"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>TRUE</span><span class=cF0>;
<a name="l212"></a>}
<a name="l213"></a>
<a name="l214"></a></span><span class=cF1>Bool</span><span class=cF0> </span><span class=cF5>FBlkWrite</span><span class=cF0>(</span><span class=cF9>CFile</span><span class=cF0> *f, </span><span class=cF1>U8</span><span class=cF0> *buf, </span><span class=cF9>I64</span><span class=cF0> blk=</span><span class=cF3>FFB_NEXT_BLK</span><span class=cF0>, </span><span class=cF9>I64</span><span class=cF0> count=</span><span class=cFE>1</span><span class=cF0>)
<a name="l215"></a>{</span><span class=cF2>//Write [nth,n+count) blocks of file.</span><span class=cF0>
<a name="l216"></a> </span><span class=cF9>CDrive</span><span class=cF0> *drive = f-&gt;drive;
<a name="l217"></a> </span><span class=cF9>I64</span><span class=cF0> spc = drive-&gt;spc, i, j, c = f-&gt;de.clus, c1;
<a name="l218"></a>
<a name="l219"></a> </span><span class=cF1>if</span><span class=cF0> (!f || !drive)
<a name="l220"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>FALSE</span><span class=cF0>;
<a name="l221"></a> </span><span class=cF1>if</span><span class=cF0> (blk == </span><span class=cF3>FFB_NEXT_BLK</span><span class=cF0>)
<a name="l222"></a> blk = f-&gt;fblk_num;
<a name="l223"></a> </span><span class=cF1>if</span><span class=cF0> (blk + count - </span><span class=cFE>1</span><span class=cF0> &gt; f-&gt;max_blk)
<a name="l224"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>FALSE</span><span class=cF0>;
<a name="l225"></a> </span><span class=cF1>if</span><span class=cF0> (!</span><span class=cF7>(</span><span class=cF0>f-&gt;flags &amp; </span><span class=cF3>FF_WRITE</span><span class=cF7>)</span><span class=cF0>)
<a name="l226"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>FALSE</span><span class=cF0>;
<a name="l227"></a> </span><span class=cF1>if</span><span class=cF0> (count &lt;= </span><span class=cFE>0</span><span class=cF0>)
<a name="l228"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>TRUE</span><span class=cF0>;
<a name="l229"></a> </span><span class=cF1>if</span><span class=cF0> (f-&gt;flags &amp; </span><span class=cF3>FF_CONTIGUOUS</span><span class=cF0>)
<a name="l230"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l231"></a> </span><span class=cF5>BlkWrite</span><span class=cF0>(drive, buf, </span><span class=cF5>Clus2Blk</span><span class=cF7>(</span><span class=cF0>drive, c</span><span class=cF7>)</span><span class=cF0> + blk, count);
<a name="l232"></a> blk += count;
<a name="l233"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l234"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l235"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l236"></a> </span><span class=cF1>if</span><span class=cF0> (!c)
<a name="l237"></a> {
<a name="l238"></a> c = </span><span class=cF5>ClusAlloc</span><span class=cF0>(drive, </span><span class=cFE>0</span><span class=cF0>, </span><span class=cFE>1</span><span class=cF0>, </span><span class=cF3>FALSE</span><span class=cF0>);
<a name="l239"></a> f-&gt;file_clus_num = </span><span class=cFE>0</span><span class=cF0>;
<a name="l240"></a> f-&gt;clus = c;
<a name="l241"></a> f-&gt;de.clus = c;
<a name="l242"></a> f-&gt;flags |= </span><span class=cF3>FF_NEEDS_WRITE</span><span class=cF0> | </span><span class=cF3>FF_NEW_FILE</span><span class=cF0>;
<a name="l243"></a> }
<a name="l244"></a> i = blk / spc;
<a name="l245"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cFE>0</span><span class=cF0> &lt;= f-&gt;file_clus_num &lt;= i)
<a name="l246"></a> {
<a name="l247"></a> c = f-&gt;clus;
<a name="l248"></a> i -= f-&gt;file_clus_num;
<a name="l249"></a> }
<a name="l250"></a> </span><span class=cF1>while</span><span class=cF0> (i &gt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l251"></a> {
<a name="l252"></a> c1 = c;
<a name="l253"></a> c = </span><span class=cF5>ClusNumNext</span><span class=cF0>(drive, c1, </span><span class=cFE>1</span><span class=cF0>);
<a name="l254"></a> </span><span class=cF1>if</span><span class=cF0> (c == </span><span class=cF3>INVALID_CLUS</span><span class=cF0>)
<a name="l255"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l256"></a> c = </span><span class=cF5>ClusAlloc</span><span class=cF0>(drive, c1, i, </span><span class=cF3>FALSE</span><span class=cF0>);
<a name="l257"></a> </span><span class=cF1>if</span><span class=cF0> (i &gt; </span><span class=cFE>1</span><span class=cF0>)
<a name="l258"></a> c = </span><span class=cF5>ClusNumNext</span><span class=cF0>(drive, c, i - </span><span class=cFE>1</span><span class=cF0>);
<a name="l259"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l260"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l261"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l262"></a> i--;
<a name="l263"></a> }
<a name="l264"></a>
<a name="l265"></a> </span><span class=cF1>if</span><span class=cF0> (i = blk % spc)
<a name="l266"></a> {
<a name="l267"></a> </span><span class=cFD>FSetClus</span><span class=cF0>(f, c, blk, </span><span class=cF3>TRUE</span><span class=cF0>);
<a name="l268"></a> </span><span class=cF1>if</span><span class=cF0> (count &lt; spc - i)
<a name="l269"></a> j = count;
<a name="l270"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l271"></a> j = spc - i;
<a name="l272"></a> </span><span class=cF5>MemCopy</span><span class=cF0>(f-&gt;clus_buf + </span><span class=cF3>BLK_SIZE</span><span class=cF0> * i, buf, j &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>);
<a name="l273"></a> f-&gt;flags |= </span><span class=cF3>FF_BUF_DIRTY</span><span class=cF0>;
<a name="l274"></a> buf += j &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>;
<a name="l275"></a> count -= j;
<a name="l276"></a> blk += j;
<a name="l277"></a> </span><span class=cF1>if</span><span class=cF0> (count &gt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l278"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l279"></a> c1 = c;
<a name="l280"></a> c = </span><span class=cF5>ClusNumNext</span><span class=cF0>(drive, c1, </span><span class=cFE>1</span><span class=cF0>);
<a name="l281"></a> </span><span class=cF1>if</span><span class=cF0> (c == </span><span class=cF3>INVALID_CLUS</span><span class=cF0>)
<a name="l282"></a> c = </span><span class=cF5>ClusAlloc</span><span class=cF0>(drive, c1, </span><span class=cFE>1</span><span class=cF0>, </span><span class=cF3>FALSE</span><span class=cF0>);
<a name="l283"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l284"></a> }
<a name="l285"></a> </span><span class=cF1>while</span><span class=cF0> (count &gt;= spc)
<a name="l286"></a> {
<a name="l287"></a> </span><span class=cFD>FSetClus</span><span class=cF0>(f, c, blk, </span><span class=cF3>FALSE</span><span class=cF0>);
<a name="l288"></a> </span><span class=cF5>MemCopy</span><span class=cF0>(f-&gt;clus_buf, buf, spc &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>);
<a name="l289"></a> f-&gt;flags |= </span><span class=cF3>FF_BUF_DIRTY</span><span class=cF0>;
<a name="l290"></a> buf += spc &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>;
<a name="l291"></a> count -= spc;
<a name="l292"></a> blk += spc;
<a name="l293"></a> </span><span class=cF1>if</span><span class=cF0> (count &gt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l294"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l295"></a> c1 = c;
<a name="l296"></a> c = </span><span class=cF5>ClusNumNext</span><span class=cF0>(drive, c1, </span><span class=cFE>1</span><span class=cF0>);
<a name="l297"></a> </span><span class=cF1>if</span><span class=cF0> (c == </span><span class=cF3>INVALID_CLUS</span><span class=cF0>)
<a name="l298"></a> c = </span><span class=cF5>ClusAlloc</span><span class=cF0>(drive, c1, </span><span class=cFE>1</span><span class=cF0>, </span><span class=cF3>FALSE</span><span class=cF0>);
<a name="l299"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l300"></a> }
<a name="l301"></a> </span><span class=cF1>if</span><span class=cF0> (count &gt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l302"></a> {
<a name="l303"></a> </span><span class=cFD>FSetClus</span><span class=cF0>(f, c, blk, </span><span class=cF3>TRUE</span><span class=cF0>);
<a name="l304"></a> </span><span class=cF5>MemCopy</span><span class=cF0>(f-&gt;clus_buf, buf, count &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>);
<a name="l305"></a> f-&gt;flags |= </span><span class=cF3>FF_BUF_DIRTY</span><span class=cF0>;
<a name="l306"></a> buf += count &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>;
<a name="l307"></a> blk += count;
<a name="l308"></a> }
<a name="l309"></a> </span><span class=cF1>if</span><span class=cF0> (f-&gt;de.size &lt; blk &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>)
<a name="l310"></a> f-&gt;de.size = blk &lt;&lt; </span><span class=cF3>BLK_SIZE_BITS</span><span class=cF0>;
<a name="l311"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l312"></a> f-&gt;fblk_num = blk;
<a name="l313"></a>
<a name="l314"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>TRUE</span><span class=cF0>;
<a name="l315"></a>}
</span></pre></body>
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