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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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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 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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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 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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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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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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74 ulTable[iCodes] = (ulTable[iCodes] << 1) |
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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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87 ulValue |= (1 << (cChar - iPos)); |
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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 } |