1fdfc2abfe
Change-Id: I02f2c620296fcd91d4967d58767ea33fc4e1e7dc Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
109 lines
3.5 KiB
C++
109 lines
3.5 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the config.tests of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this
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** file. Please review the following information to ensure the GNU Lesser
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** General Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU General
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** Public License version 3.0 as published by the Free Software Foundation
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** and appearing in the file LICENSE.GPL included in the packaging of this
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** file. Please review the following information to ensure the GNU General
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** Public License version 3.0 requirements will be met:
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** http://www.gnu.org/copyleft/gpl.html.
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**
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** Other Usage
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** Alternatively, this file may be used in accordance with the terms and
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** conditions contained in a signed written agreement between you and Nokia.
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <iostream>
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#include <cstdlib>
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#include <cstring>
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class CCRC32
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{
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public:
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CCRC32() { initialize(); }
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unsigned long FullCRC(const unsigned char *sData, unsigned long ulDataLength)
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{
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unsigned long ulCRC = 0xffffffff;
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PartialCRC(&ulCRC, sData, ulDataLength);
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return(ulCRC ^ 0xffffffff);
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}
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void PartialCRC(unsigned long *ulCRC, const unsigned char *sData, unsigned long ulDataLength)
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{
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while(ulDataLength--) {
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*ulCRC = (*ulCRC >> 8) ^ ulTable[(*ulCRC & 0xFF) ^ *sData++];
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}
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}
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private:
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void initialize(void)
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{
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unsigned long ulPolynomial = 0x04C11DB7;
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memset(&ulTable, 0, sizeof(ulTable));
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for(int iCodes = 0; iCodes <= 0xFF; iCodes++) {
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ulTable[iCodes] = Reflect(iCodes, 8) << 24;
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for(int iPos = 0; iPos < 8; iPos++) {
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ulTable[iCodes] = ((ulTable[iCodes] << 1) & 0xffffffff)
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^ ((ulTable[iCodes] & (1 << 31)) ? ulPolynomial : 0);
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}
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ulTable[iCodes] = Reflect(ulTable[iCodes], 32);
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}
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}
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unsigned long Reflect(unsigned long ulReflect, const char cChar)
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{
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unsigned long ulValue = 0;
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// Swap bit 0 for bit 7, bit 1 For bit 6, etc....
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for(int iPos = 1; iPos < (cChar + 1); iPos++) {
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if(ulReflect & 1) {
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ulValue |= (1ul << (cChar - iPos));
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}
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ulReflect >>= 1;
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}
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return ulValue;
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}
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unsigned long ulTable[256]; // CRC lookup table array.
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};
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int main(int argc, char **argv)
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{
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CCRC32 crc;
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char *name;
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if (argc < 2) {
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std::cerr << "usage: crc <string>\n";
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return 0;
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} else {
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name = argv[1];
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}
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std::cout << crc.FullCRC((unsigned char *)name, strlen(name)) << std::endl;
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}
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