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1 /* |
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2 * Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of the License "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 |
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18 |
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19 /** |
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20 @file |
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21 @internalTechnology |
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22 */ |
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23 #include "filecompare.h" |
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24 |
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25 #include "cryptospi/cryptospidef.h" |
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26 #include <e32std.h> |
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27 #include <e32def.h> |
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28 #include <f32file.h> |
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29 |
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30 const TInt KCompareBlockSize = 0xff; |
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31 |
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32 //const TInt KCompareEqual = 0; |
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33 const TInt KCompareGreaterThan = 1; |
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34 const TInt KCompareLessThan = -1; |
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35 |
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36 // a simple utility class to compare 2 files, returns |
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37 TInt TFileCompare::CompareL(TPtrC aFile1Path, TPtrC aFile2Path) |
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38 { |
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39 // assume is all well, compare always |
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40 TInt retVal = 0; |
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41 |
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42 RFs rFs; |
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43 RFile file1; |
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44 RFile file2; |
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45 |
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46 User::LeaveIfError(rFs.Connect()); |
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47 CleanupClosePushL(rFs); |
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48 User::LeaveIfError(file1.Open(rFs, aFile1Path, EFileRead)); |
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49 CleanupClosePushL(file1); |
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50 User::LeaveIfError(file2.Open(rFs, aFile2Path, EFileRead)); |
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51 CleanupClosePushL(file2); |
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52 |
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53 TInt file1Size; |
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54 file1.Size(file1Size); |
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55 |
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56 TInt file2Size; |
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57 file2.Size(file2Size); |
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58 |
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59 // bail out if the sizes of the 2 files are different |
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60 if(file1Size == file2Size) |
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61 { |
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62 |
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63 TBuf8<KCompareBlockSize> tempBuf1; |
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64 TBuf8<KCompareBlockSize> tempBuf2; |
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65 |
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66 TInt compareBlockSize; |
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67 TInt loopCount; |
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68 |
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69 if(file1Size > KCompareBlockSize) |
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70 { |
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71 compareBlockSize = KCompareBlockSize; |
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72 loopCount = file1Size / compareBlockSize; |
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73 } |
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74 else |
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75 { |
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76 loopCount = 1; |
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77 compareBlockSize = file1Size; |
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78 } |
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79 |
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80 |
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81 // read through the files comparing each block |
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82 for(TInt i = 0; i < loopCount; i++) |
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83 { |
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84 |
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85 file1.Read(tempBuf1, compareBlockSize); |
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86 file2.Read(tempBuf2, compareBlockSize); |
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87 |
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88 // remember, 0 is return value for a successful comparison |
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89 |
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90 retVal = tempBuf1.Compare(tempBuf2); |
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91 if( retVal != 0 ) |
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92 { |
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93 //if files fail to match, break out of the loop |
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94 break; |
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95 } |
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96 } |
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97 } |
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98 else |
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99 { |
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100 if(file1Size > file2Size) |
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101 retVal = KCompareGreaterThan; |
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102 else |
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103 retVal = KCompareLessThan; |
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104 } |
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105 |
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106 CleanupStack::PopAndDestroy(&file2); |
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107 CleanupStack::PopAndDestroy(&file1); |
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108 |
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109 CleanupStack::PopAndDestroy(&rFs); |
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110 |
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111 return retVal; |
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112 } |