[561] | 1 | /****************************************************************************
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| 2 | **
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[846] | 3 | ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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[561] | 4 | ** All rights reserved.
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| 5 | ** Contact: Nokia Corporation (qt-info@nokia.com)
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| 6 | **
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| 7 | ** This file is part of the config.tests of the Qt Toolkit.
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| 8 | **
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| 9 | ** $QT_BEGIN_LICENSE:LGPL$
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| 10 | ** Commercial Usage
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| 11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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| 12 | ** accordance with the Qt Commercial License Agreement provided with the
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| 13 | ** Software or, alternatively, in accordance with the terms contained in
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| 14 | ** a written agreement between you and Nokia.
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| 15 | **
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| 16 | ** GNU Lesser General Public License Usage
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| 17 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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| 18 | ** General Public License version 2.1 as published by the Free Software
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| 19 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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| 20 | ** packaging of this file. Please review the following information to
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| 21 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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| 22 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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| 23 | **
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| 24 | ** In addition, as a special exception, Nokia gives you certain additional
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| 25 | ** rights. These rights are described in the Nokia Qt LGPL Exception
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| 26 | ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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| 27 | **
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| 28 | ** GNU General Public License Usage
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| 29 | ** Alternatively, this file may be used under the terms of the GNU
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| 30 | ** General Public License version 3.0 as published by the Free Software
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| 31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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| 32 | ** packaging of this file. Please review the following information to
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| 33 | ** ensure the GNU General Public License version 3.0 requirements will be
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| 34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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| 35 | **
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| 36 | ** If you have questions regarding the use of this file, please contact
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| 37 | ** Nokia at qt-info@nokia.com.
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| 38 | ** $QT_END_LICENSE$
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| 39 | **
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| 40 | ****************************************************************************/
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| 41 |
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[2] | 42 | #include <iostream>
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| 43 | #include <cstdlib>
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| 44 | #include <cstring>
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| 45 |
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| 46 |
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| 47 | class CCRC32
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| 48 | {
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| 49 | public:
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| 50 | CCRC32() { initialize(); }
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| 51 |
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| 52 | unsigned long FullCRC(const unsigned char *sData, unsigned long ulDataLength)
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| 53 | {
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| 54 | unsigned long ulCRC = 0xffffffff;
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| 55 | PartialCRC(&ulCRC, sData, ulDataLength);
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| 56 | return(ulCRC ^ 0xffffffff);
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| 57 | }
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| 58 |
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| 59 | void PartialCRC(unsigned long *ulCRC, const unsigned char *sData, unsigned long ulDataLength)
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| 60 | {
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| 61 | while(ulDataLength--) {
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| 62 | *ulCRC = (*ulCRC >> 8) ^ ulTable[(*ulCRC & 0xFF) ^ *sData++];
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| 63 | }
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| 64 | }
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| 65 |
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| 66 | private:
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| 67 | void initialize(void)
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| 68 | {
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| 69 | unsigned long ulPolynomial = 0x04C11DB7;
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| 70 | memset(&ulTable, 0, sizeof(ulTable));
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| 71 | for(int iCodes = 0; iCodes <= 0xFF; iCodes++) {
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| 72 | ulTable[iCodes] = Reflect(iCodes, 8) << 24;
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| 73 | for(int iPos = 0; iPos < 8; iPos++) {
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[561] | 74 | ulTable[iCodes] = ((ulTable[iCodes] << 1) & 0xffffffff)
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[2] | 75 | ^ ((ulTable[iCodes] & (1 << 31)) ? ulPolynomial : 0);
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| 76 | }
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| 77 |
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| 78 | ulTable[iCodes] = Reflect(ulTable[iCodes], 32);
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| 79 | }
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| 80 | }
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| 81 | unsigned long Reflect(unsigned long ulReflect, const char cChar)
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| 82 | {
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| 83 | unsigned long ulValue = 0;
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| 84 | // Swap bit 0 for bit 7, bit 1 For bit 6, etc....
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| 85 | for(int iPos = 1; iPos < (cChar + 1); iPos++) {
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| 86 | if(ulReflect & 1) {
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[561] | 87 | ulValue |= (1ul << (cChar - iPos));
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[2] | 88 | }
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| 89 | ulReflect >>= 1;
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| 90 | }
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| 91 | return ulValue;
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| 92 | }
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| 93 | unsigned long ulTable[256]; // CRC lookup table array.
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| 94 | };
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| 95 |
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| 96 |
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| 97 | int main(int argc, char **argv)
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| 98 | {
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| 99 | CCRC32 crc;
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| 100 | char *name;
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| 101 | if (argc < 2) {
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| 102 | std::cerr << "usage: crc <string>\n";
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| 103 | return 0;
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| 104 | } else {
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| 105 | name = argv[1];
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| 106 | }
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| 107 | std::cout << crc.FullCRC((unsigned char *)name, strlen(name)) << std::endl;
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| 108 | }
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