firmware_8cpp-source.html

美国COPLEY驱动器,程序开发工具之一.

<a name="l00127"></a>00127    }
<a name="l00128"></a>00128 
<a name="l00129"></a>00129    f.Close();
<a name="l00130"></a>00130    <span class="keywordflow">return</span> 0;
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132 
<a name="l00133"></a>00133 <span class="comment">/***************************************************************************/</span><span class="comment"></span>
<a name="l00134"></a>00134 <span class="comment">/**</span>
<a name="l00135"></a>00135 <span class="comment">Open the specified file.</span>
<a name="l00136"></a>00136 <span class="comment">@param name The file name/path</span>
<a name="l00137"></a>00137 <span class="comment">@return An error object</span>
<a name="l00138"></a>00138 <span class="comment">*/</span>
<a name="l00139"></a>00139 <span class="comment">/***************************************************************************/</span>
<a name="l00140"></a>00140 <span class="keyword">const</span> <a class="code" href="classError.html">Error</a> *File::Open( <span class="keyword">const</span> <span class="keywordtype">char</span> *name )
<a name="l00141"></a>00141 {
<a name="l00142"></a>00142    fp = fopen( name, <span class="stringliteral">"rb"</span> );
<a name="l00143"></a>00143    <span class="keywordflow">if</span>( !fp ) <span class="keywordflow">return</span> &amp;<a class="code" href="classFirmwareError.html#s0">FirmwareError::open</a>;
<a name="l00144"></a>00144    <span class="keywordflow">return</span> 0;
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146 
<a name="l00147"></a>00147 <span class="comment">/***************************************************************************/</span><span class="comment"></span>
<a name="l00148"></a>00148 <span class="comment">/**</span>
<a name="l00149"></a>00149 <span class="comment">Read a 16-bit integer from the file.  This function handles both big endian</span>
<a name="l00150"></a>00150 <span class="comment">and little endian file formats.</span>
<a name="l00151"></a>00151 <span class="comment">@param d  Data will be stored here</span>
<a name="l00152"></a>00152 <span class="comment">@return An error object</span>
<a name="l00153"></a>00153 <span class="comment">*/</span>
<a name="l00154"></a>00154 <span class="comment">/***************************************************************************/</span>
<a name="l00155"></a>00155 <span class="keyword">const</span> <a class="code" href="classError.html">Error</a> *File::ReadInt16( <a class="code" href="CML__Utils_8h.html#a8">uint16</a> &amp;d )
<a name="l00156"></a>00156 {
<a name="l00157"></a>00157    <a class="code" href="CML__Utils_8h.html#a6">uint8</a> data[2];
<a name="l00158"></a>00158    <span class="keywordflow">if</span>( fread( data, 1, 2, fp ) != 2 )
<a name="l00159"></a>00159       <span class="keywordflow">return</span> &amp;<a class="code" href="classFirmwareError.html#s1">FirmwareError::read</a>;
<a name="l00160"></a>00160 
<a name="l00161"></a>00161    <span class="keywordflow">if</span>( bigEndian )
<a name="l00162"></a>00162       d = ((<a class="code" href="CML__Utils_8h.html#a8">uint16</a>)data[1]) | ((<a class="code" href="CML__Utils_8h.html#a8">uint16</a>)data[0]&lt;&lt;8);
<a name="l00163"></a>00163    <span class="keywordflow">else</span>
<a name="l00164"></a>00164       d = ((<a class="code" href="CML__Utils_8h.html#a8">uint16</a>)data[0]) | ((<a class="code" href="CML__Utils_8h.html#a8">uint16</a>)data[1]&lt;&lt;8);
<a name="l00165"></a>00165 
<a name="l00166"></a>00166    <span class="keywordflow">return</span> 0;
<a name="l00167"></a>00167 }
<a name="l00168"></a>00168 
<a name="l00169"></a>00169 <span class="comment">/***************************************************************************/</span><span class="comment"></span>
<a name="l00170"></a>00170 <span class="comment">/**</span>
<a name="l00171"></a>00171 <span class="comment">Read a 32-bit integer from the file.  This function handles both big endian</span>
<a name="l00172"></a>00172 <span class="comment">and little endian file formats.</span>
<a name="l00173"></a>00173 <span class="comment">@param d  Data will be stored here</span>
<a name="l00174"></a>00174 <span class="comment">@return An error object</span>
<a name="l00175"></a>00175 <span class="comment">*/</span>
<a name="l00176"></a>00176 <span class="comment">/***************************************************************************/</span>
<a name="l00177"></a>00177 <span class="keyword">const</span> <a class="code" href="classError.html">Error</a> *File::ReadInt32( <a class="code" href="CML__Utils_8h.html#a10">uint32</a> &amp;d )
<a name="l00178"></a>00178 {
<a name="l00179"></a>00179    <a class="code" href="CML__Utils_8h.html#a6">uint8</a> data[4];
<a name="l00180"></a>00180    <span class="keywordflow">if</span>( fread( data, 1, 4, fp ) != 4 )
<a name="l00181"></a>00181       <span class="keywordflow">return</span> &amp;<a class="code" href="classFirmwareError.html#s1">FirmwareError::read</a>;
<a name="l00182"></a>00182 
<a name="l00183"></a>00183    <span class="keywordflow">if</span>( bigEndian )
<a name="l00184"></a>00184    {
<a name="l00185"></a>00185       d = ((<a class="code" href="CML__Utils_8h.html#a10">uint32</a>)data[3])     | ((<a class="code" href="CML__Utils_8h.html#a10">uint32</a>)data[2]&lt;&lt;8) |
<a name="l00186"></a>00186      ((<a class="code" href="CML__Utils_8h.html#a10">uint32</a>)data[1]&lt;&lt;16) | ((<a class="code" href="CML__Utils_8h.html#a10">uint32</a>)data[0]&lt;&lt;24);
<a name="l00187"></a>00187    }
<a name="l00188"></a>00188    <span class="keywordflow">else</span>
<a name="l00189"></a>00189    {
<a name="l00190"></a>00190       d = ((<a class="code" href="CML__Utils_8h.html#a10">uint32</a>)data[0])     | ((<a class="code" href="CML__Utils_8h.html#a10">uint32</a>)data[1]&lt;&lt;8) |
<a name="l00191"></a>00191      ((<a class="code" href="CML__Utils_8h.html#a10">uint32</a>)data[2]&lt;&lt;16) | ((<a class="code" href="CML__Utils_8h.html#a10">uint32</a>)data[3]&lt;&lt;24);
<a name="l00192"></a>00192    }
<a name="l00193"></a>00193 
<a name="l00194"></a>00194    <span class="keywordflow">return</span> 0;
<a name="l00195"></a>00195 }
<a name="l00196"></a>00196 
<a name="l00197"></a>00197 <span class="comment">/***************************************************************************/</span><span class="comment"></span>
<a name="l00198"></a>00198 <span class="comment">/**</span>
<a name="l00199"></a>00199 <span class="comment">Seek to the absolute byte position in the file.</span>
<a name="l00200"></a>00200 <span class="comment">@param pos The byte position to seek</span>
<a name="l00201"></a>00201 <span class="comment">@return An error object.</span>
<a name="l00202"></a>00202 <span class="comment">*/</span>
<a name="l00203"></a>00203 <span class="comment">/***************************************************************************/</span>
<a name="l00204"></a>00204 <span class="keyword">const</span> <a class="code" href="classError.html">Error</a> *File::Seek( <a class="code" href="CML__Utils_8h.html#a10">uint32</a> pos )
<a name="l00205"></a>00205 {
<a name="l00206"></a>00206    <span class="keywordflow">if</span>( fseek( fp, pos, SEEK_SET ) == 0 )
<a name="l00207"></a>00207       <span class="keywordflow">return</span> 0;
<a name="l00208"></a>00208 
<a name="l00209"></a>00209    <span class="keywordflow">return</span> &amp;<a class="code" href="classFirmwareError.html#s1">FirmwareError::read</a>;
<a name="l00210"></a>00210 }
<a name="l00211"></a>00211 
<a name="l00212"></a>00212 <span class="comment">/***************************************************************************/</span><span class="comment"></span>
<a name="l00213"></a>00213 <span class="comment">/**</span>
<a name="l00214"></a>00214 <span class="comment">Calculate the CRC of the file.  The CRC value is calculated starting</span>
<a name="l00215"></a>00215 <span class="comment">at the present file position, and running through the end of the file.</span>
<a name="l00216"></a>00216 <span class="comment">*/</span>
<a name="l00217"></a>00217 <span class="comment">/***************************************************************************/</span>
<a name="l00218"></a>00218 
<a name="l00219"></a>00219 <span class="preprocessor">#define CRC32_POLYNOMIAL   0xEDB88320</span>
<a name="l00220"></a>00220 <span class="preprocessor"></span><a class="code" href="CML__Utils_8h.html#a10">uint32</a> File::CRC32( <span class="keywordtype">void</span> )
<a name="l00221"></a>00221 {
<a name="l00222"></a>00222    <a class="code" href="CML__Utils_8h.html#a10">uint32</a> crcTable[256];
<a name="l00223"></a>00223 
<a name="l00224"></a>00224    <span class="keywordflow">for</span>( <span class="keywordtype">int</span> i=0; i&lt;256; i++ )
<a name="l00225"></a>00225    {
<a name="l00226"></a>00226       <a class="code" href="CML__Utils_8h.html#a10">uint32</a> crc = i;
<a name="l00227"></a>00227       <span class="keywordflow">for</span>( <span class="keywordtype">int</span> j=0; j&lt;8; j++ )
<a name="l00228"></a>00228       {
<a name="l00229"></a>00229     <span class="keywordflow">if</span>( crc &amp; 1)
<a name="l00230"></a>00230        crc = ( crc &gt;&gt; 1 ) ^ CRC32_POLYNOMIAL;
<a name="l00231"></a>00231     <span class="keywordflow">else</span>
<a name="l00232"></a>00232        crc &gt;&gt;= 1;
<a name="l00233"></a>00233       }
<a name="l00234"></a>00234       crcTable[ i ] = crc;
<a name="l00235"></a>00235    }
<a name="l00236"></a>00236 
<a name="l00237"></a>00237    <a class="code" href="CML__Utils_8h.html#a10">uint32</a> crc = 0xFFFFFFFF;
<a name="l00238"></a>00238    <span class="keywordtype">int</span> ch;
<a name="l00239"></a>00239 
<a name="l00240"></a>00240    <span class="keywordflow">while</span>( (ch=fgetc(fp)) != EOF )
<a name="l00241"></a>00241    {
<a name="l00242"></a>00242       <a class="code" href="CML__Utils_8h.html#a10">uint32</a> temp1 = crc&gt;&gt;8;
<a name="l00243"></a>00243       <a class="code" href="CML__Utils_8h.html#a10">uint32</a> temp2 = crcTable[ (crc ^ ch) &amp; 0xff ];
<a name="l00244"></a>00244       crc = temp1 ^ temp2;
<a name="l00245"></a>00245    }
<a name="l00246"></a>00246 
<a name="l00247"></a>00247    crc ^= 0xFFFFFFFF;
<a name="l00248"></a>00248    <span class="keywordflow">return</span> crc;
<a name="l00249"></a>00249 }
<a name="l00250"></a>00250 <span class="preprocessor">#endif</span>
</pre></div><hr>
<address style="align: right;">
<small>Copley Motion Library, Copyright (c) 2002-2003
<a href="http://www.copleycontrols.com">
<img src="CCC_logo.gif" alt="Copley Controls Corp." align="middle" border=0 ></a>
</small>
</address>
</body>
</html>