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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_c_r_c_8_c_source.html
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
changeset 14 578be2adaf3e
parent 6 43e37759235e
permissions -rw-r--r--
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
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<title>TB9.2 Example Applications: examples/Stdlib/GUIApp/CRC.C Source File</title>
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<link href="tabs.css" rel="stylesheet" type="text/css"/>
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<link href="doxygen.css" rel="stylesheet" type="text/css"/>
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</head>
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<body>
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<!-- Generated by Doxygen 1.6.2 -->
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<h1>examples/Stdlib/GUIApp/CRC.C</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
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<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
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<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
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<a name="l00004"></a>00004 <span class="comment">// under the terms of &quot;Eclipse Public License v1.0&quot;</span>
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<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
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<a name="l00006"></a>00006 <span class="comment">// at the URL &quot;http://www.eclipse.org/legal/epl-v10.html&quot;.</span>
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<a name="l00007"></a>00007 <span class="comment">//</span>
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<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
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<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
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<a name="l00010"></a>00010 <span class="comment">//</span>
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<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
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<a name="l00012"></a>00012 <span class="comment">//</span>
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<a name="l00013"></a>00013 <span class="comment">// Description:</span>
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<a name="l00014"></a>00014 <span class="comment">//</span>
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<a name="l00015"></a>00015
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<a name="l00016"></a>00016 <span class="comment">/*#ifndef lint</span>
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<a name="l00017"></a>00017 <span class="comment">const static char sccsid[] = &quot;@(#)crc.c 8.1 (Berkeley) 6/17/93&quot;;</span>
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<a name="l00018"></a>00018 <span class="comment">#endif*/</span>
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<a name="l00019"></a>00019 <span class="comment">// not lint </span>
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<a name="l00020"></a>00020
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<a name="l00021"></a>00021 <span class="preprocessor">#include &lt;unistd.h&gt;</span>
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<a name="l00022"></a>00022
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<a name="l00023"></a>00023 <span class="keyword">const</span> <span class="keyword">static</span> u_long crctab[] = {
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<a name="l00076"></a>00076 };
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<a name="l00077"></a>00077
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<a name="l00078"></a>00078 <span class="comment">/*</span>
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<a name="l00079"></a>00079 <span class="comment"> * Compute a POSIX 1003.2 checksum.  This routine has been broken out so that</span>
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<a name="l00080"></a>00080 <span class="comment"> * other programs can use it.  It takes a file descriptor to read from and</span>
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<a name="l00081"></a>00081 <span class="comment"> * locations to store the crc and the number of bytes read.  It returns 0 on</span>
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<a name="l00082"></a>00082 <span class="comment"> * success and 1 on failure.  Errno is set on failure.</span>
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<a name="l00083"></a>00083 <span class="comment"> */</span>
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<a name="l00084"></a>00084
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<a name="l00085"></a>00085
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<a name="l00086"></a>00086 EXPORT_C <span class="keywordtype">int</span> crc(<span class="keyword">register</span> <span class="keywordtype">int</span> fd, u_long *cval, u_long *clen)
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<a name="l00087"></a>00087 {
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<a name="l00088"></a>00088         u_long crc_total = (u_long)~0;  <span class="comment">/* The crc over a number of files*/</span>
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<a name="l00089"></a>00089         <span class="keyword">register</span> u_char *p;
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<a name="l00090"></a>00090         <span class="keyword">register</span> <span class="keywordtype">int</span> nr;
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<a name="l00091"></a>00091         <span class="keyword">register</span> u_long crc, len;
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<a name="l00092"></a>00092 <span class="comment">//      u_char buf[16 * 1024]; // too large for stack</span>
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<a name="l00093"></a>00093         u_char buf[3 * 1024];
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<a name="l00094"></a>00094
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<a name="l00095"></a>00095 <span class="preprocessor">#define COMPUTE(var, ch)        (var) = (var) &lt;&lt; 8 ^ crctab[(var) &gt;&gt; 24 ^ (ch)]</span>
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<a name="l00096"></a>00096 <span class="preprocessor"></span>
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<a name="l00097"></a>00097         crc = len = 0;
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<a name="l00098"></a>00098         crc_total = ~crc_total;
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<a name="l00099"></a>00099         <span class="keywordflow">while</span> ((nr = read(fd, (<span class="keywordtype">char</span>*)buf, <span class="keyword">sizeof</span>(buf))) &gt; 0)
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<a name="l00100"></a>00100                 <span class="keywordflow">for</span> (len += nr, p = buf; nr--; ++p) {
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<a name="l00101"></a>00101                         COMPUTE(crc, *p);
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<a name="l00102"></a>00102                         COMPUTE(crc_total, *p);
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<a name="l00103"></a>00103                 }
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<a name="l00104"></a>00104         <span class="keywordflow">if</span> (nr &lt; 0)
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<a name="l00105"></a>00105                 <span class="keywordflow">return</span> (1);
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<a name="l00106"></a>00106
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<a name="l00107"></a>00107         *clen = len;
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<a name="l00108"></a>00108
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<a name="l00109"></a>00109         <span class="comment">/* Include the length of the file. */</span>
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<a name="l00110"></a>00110         <span class="keywordflow">for</span> (; len != 0; len &gt;&gt;= 8) {
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<a name="l00111"></a>00111                 COMPUTE(crc, len &amp; 0xff);
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<a name="l00112"></a>00112                 COMPUTE(crc_total, len &amp; 0xff);
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<a name="l00113"></a>00113         }
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<a name="l00114"></a>00114
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<a name="l00115"></a>00115         *cval = ~crc;
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<a name="l00116"></a>00116         crc_total = ~crc_total;
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<a name="l00117"></a>00117         <span class="keywordflow">return</span> (0);
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<a name="l00118"></a>00118 }
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</pre></div></div>
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<hr size="1"/><address style="text-align: right;"><small>Generated by&nbsp;
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<a href="http://www.doxygen.org/index.html">
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address>
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</body>
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</html>
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