author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Tue, 30 Mar 2010 16:16:55 +0100 | |
changeset 6 | 43e37759235e |
permissions | -rw-r--r-- |
6
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Week 12 contribution of example code"
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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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Week 12 contribution of example code"
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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 "Eclipse Public License v1.0"</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 "http://www.eclipse.org/legal/epl-v10.html".</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[] = "@(#)crc.c 8.1 (Berkeley) 6/17/93";</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 <unistd.h></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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Week 12 contribution of example code"
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Week 12 contribution of example code"
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Week 12 contribution of example code"
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Week 12 contribution of example code"
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Week 12 contribution of example code"
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Week 12 contribution of example code"
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Week 12 contribution of example code"
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Week 12 contribution of example code"
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Week 12 contribution of example code"
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Week 12 contribution of example code"
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Week 12 contribution of example code"
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Week 12 contribution of example code"
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Week 12 contribution of example code"
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Week 12 contribution of example code"
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Week 12 contribution of example code"
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Week 12 contribution of example code"
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<a name="l00072"></a>00072 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, 0x89b8fd09, |
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Week 12 contribution of example code"
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83 |
<a name="l00073"></a>00073 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662, |
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Week 12 contribution of example code"
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84 |
<a name="l00074"></a>00074 0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, |
43e37759235e
Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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85 |
<a name="l00075"></a>00075 0xa2f33668, 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4 |
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Week 12 contribution of example code"
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86 |
<a name="l00076"></a>00076 }; |
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87 |
<a name="l00077"></a>00077 |
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88 |
<a name="l00078"></a>00078 <span class="comment">/*</span> |
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89 |
<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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90 |
<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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91 |
<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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92 |
<a name="l00082"></a>00082 <span class="comment"> * success and 1 on failure. Errno is set on failure.</span> |
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93 |
<a name="l00083"></a>00083 <span class="comment"> */</span> |
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94 |
<a name="l00084"></a>00084 |
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95 |
<a name="l00085"></a>00085 |
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96 |
<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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97 |
<a name="l00087"></a>00087 { |
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98 |
<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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99 |
<a name="l00089"></a>00089 <span class="keyword">register</span> u_char *p; |
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100 |
<a name="l00090"></a>00090 <span class="keyword">register</span> <span class="keywordtype">int</span> nr; |
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101 |
<a name="l00091"></a>00091 <span class="keyword">register</span> u_long crc, len; |
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102 |
<a name="l00092"></a>00092 <span class="comment">// u_char buf[16 * 1024]; // too large for stack</span> |
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103 |
<a name="l00093"></a>00093 u_char buf[3 * 1024]; |
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104 |
<a name="l00094"></a>00094 |
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105 |
<a name="l00095"></a>00095 <span class="preprocessor">#define COMPUTE(var, ch) (var) = (var) << 8 ^ crctab[(var) >> 24 ^ (ch)]</span> |
43e37759235e
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106 |
<a name="l00096"></a>00096 <span class="preprocessor"></span> |
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107 |
<a name="l00097"></a>00097 crc = len = 0; |
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108 |
<a name="l00098"></a>00098 crc_total = ~crc_total; |
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109 |
<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))) > 0) |
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110 |
<a name="l00100"></a>00100 <span class="keywordflow">for</span> (len += nr, p = buf; nr--; ++p) { |
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111 |
<a name="l00101"></a>00101 COMPUTE(crc, *p); |
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112 |
<a name="l00102"></a>00102 COMPUTE(crc_total, *p); |
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113 |
<a name="l00103"></a>00103 } |
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114 |
<a name="l00104"></a>00104 <span class="keywordflow">if</span> (nr < 0) |
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115 |
<a name="l00105"></a>00105 <span class="keywordflow">return</span> (1); |
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116 |
<a name="l00106"></a>00106 |
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117 |
<a name="l00107"></a>00107 *clen = len; |
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118 |
<a name="l00108"></a>00108 |
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119 |
<a name="l00109"></a>00109 <span class="comment">/* Include the length of the file. */</span> |
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120 |
<a name="l00110"></a>00110 <span class="keywordflow">for</span> (; len != 0; len >>= 8) { |
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121 |
<a name="l00111"></a>00111 COMPUTE(crc, len & 0xff); |
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122 |
<a name="l00112"></a>00112 COMPUTE(crc_total, len & 0xff); |
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123 |
<a name="l00113"></a>00113 } |
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124 |
<a name="l00114"></a>00114 |
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125 |
<a name="l00115"></a>00115 *cval = ~crc; |
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126 |
<a name="l00116"></a>00116 crc_total = ~crc_total; |
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127 |
<a name="l00117"></a>00117 <span class="keywordflow">return</span> (0); |
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128 |
<a name="l00118"></a>00118 } |
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129 |
</pre></div></div> |
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<hr size="1"/><address style="text-align: right;"><small>Generated by |
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131 |
<a href="http://www.doxygen.org/index.html"> |
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132 |
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address> |
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133 |
</body> |
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134 |
</html> |