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1 // Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of the License "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // f32\sfat\inc\sl_scandrv.h |
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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 @file |
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20 @internalTechnology |
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21 */ |
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22 |
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23 #ifndef SL_SCANDRV_H |
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24 #define SL_SCANDRV_H |
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25 |
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26 //--------------------------------------------------------------------------------------------------------------------------------- |
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27 |
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28 const TInt KMaxMatchingEntries = 2; ///< Maximum number of matching directory entries scan drive can fix. Any more indicates a fault in the file system |
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29 const TInt KMaxArrayDepth = 6; ///< Maximum array depth for cluster storage when KMaxScanDepth is reached |
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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 Data structure used to store the location of a partial VFat entry |
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35 */ |
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36 struct TPartVFatEntry |
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37 { |
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38 TEntryPos iEntryPos; ///< The position of the partial VFat entry |
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39 TFatDirEntry iEntry; ///< The Dos entry The VFat entries belong with |
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40 }; |
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41 |
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42 //--------------------------------------------------------------------------------------------------------------------------------- |
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43 |
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44 /** |
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45 Data structure used to store the locations of entries with matching |
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46 start cluster numbers. |
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47 */ |
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48 struct TMatchingStartCluster |
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49 { |
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50 TEntryPos iEntries[KMaxMatchingEntries]; ///< The positions of the matching entries |
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51 TInt iCount; ///< Count of matching entries |
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52 TInt iStartCluster; ///< The matching cluster number found in more than one entry |
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53 }; |
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54 |
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55 |
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56 //--------------------------------------------------------------------------------------------------------------------------------- |
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57 |
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58 class CCheckFatTable : public CBase |
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59 { |
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60 public: |
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61 static CCheckFatTable* NewL(CFatMountCB* aOwner); |
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62 CCheckFatTable(CFatMountCB* aOwner); |
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63 ~CCheckFatTable(); |
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64 void InitializeL(); |
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65 TBool FlushL(); |
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66 TBool GetNextClusterL(TInt& aCluster) const; |
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67 void WriteFatEntryEofFL(TInt aCluster); |
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68 TInt ReadL(TInt aFatIndex) const; |
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69 void WriteL(TInt aFatIndex,TInt aValue); |
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70 private: |
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71 void WriteMediaDescriptor(); |
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72 TInt PosInBytes(TInt aFatIndex) const; |
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73 TInt PosInIndex(TInt aBytePos) const; |
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74 inline TBool IsEof16Bit(TInt aCluster) const; |
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75 inline TBool IsEof12Bit(TInt aCluster) const; |
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76 inline TInt MaxFatIndex() const; |
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77 protected: |
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78 TInt iMaxFatIndex; |
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79 TUint8* iCheckFat; |
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80 CFatMountCB* iOwner; |
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81 }; |
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82 |
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83 |
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84 //--------------------------------------------------------------------------------------------------------------------------------- |
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85 |
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86 /** |
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87 Scan drive class performs scan drive functionality on all types |
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88 of fat volume. |
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89 */ |
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90 class CScanDrive : public CBase |
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91 { |
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92 public: |
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93 enum TDirError{EScanMatchingEntry=1,EScanPartEntry}; |
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94 public: |
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95 CScanDrive(); |
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96 ~CScanDrive(); |
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97 static CScanDrive* NewL(CFatMountCB* aMount); |
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98 void ConstructL(CFatMountCB* aMount); |
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99 TInt StartL(); |
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100 TBool ProblemsDiscovered() const; |
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101 |
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102 |
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103 private: |
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104 |
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105 #if defined(DEBUG_SCANDRIVE) |
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106 void PrintErrors(); |
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107 void CompareFatsL() const; |
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108 #endif |
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109 |
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110 void FixupDirErrorL(); |
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111 void FindSameStartClusterL(); |
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112 TInt FindStartClusterL(TInt aDirCluster); |
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113 void CheckDirStructureL(); |
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114 void CheckDirL(TInt aCluster); |
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115 void ProcessEntryL(const TFatDirEntry& aEntry); |
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116 TInt CheckEntryClusterL(const TFatDirEntry& aEntry, const TEntryPos& aEntryPos); |
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117 void WriteClusterChainL(TInt aCluster,TInt aSizeInBytes); |
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118 TBool MoveToVFatEndL(TEntryPos& aPos,TFatDirEntry& aEntry,TInt& aDirLength); |
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119 TBool IsValidVFatEntry(const TFatDirEntry& aEntry,TInt prevNum)const; |
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120 TBool IsDosEntry(const TFatDirEntry& aEntry)const; |
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121 void AddPartialVFatL(const TEntryPos& aStartPos, const TFatDirEntry& aEntry); |
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122 TBool AddMatchingEntryL(const TEntryPos& aEntryPos); |
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123 TInt GetReservedidL(const TEntryPos aVFatPos); |
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124 void WriteNewFatsL(); |
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125 void FixPartEntryL(); |
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126 void FixMatchingEntryL(); |
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127 void MovePastEntriesL(TEntryPos& aEntryPos,TFatDirEntry& aEntry,TInt aToMove,TInt& aDirEntries); |
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128 void AddToClusterListL(TInt aCluster); |
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129 inline TBool AlreadyExistsL(TInt aCluster)const; |
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130 inline TBool IsEndOfRootDir(const TEntryPos& aPos)const; |
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131 inline TBool IsEofF(TInt aVal)const; |
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132 inline TBool IsDirError()const; |
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133 void IndicateErrorsFound(); |
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134 |
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135 private: |
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136 CFatMountCB* iMount; |
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137 CCheckFatTable* iNewFat; |
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138 TPartVFatEntry iPartEntry; |
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139 TMatchingStartCluster iMatching; |
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140 TDirError iDirError; |
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141 TInt iDirsChecked; |
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142 TInt iRecursiveDepth; |
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143 RArray<TInt>* iClusterListArray[KMaxArrayDepth]; |
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144 TInt iListArrayIndex; |
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145 TBool iFoundProblems; ///< if ETrue after finish, it means that there where some problems FS structure and they were probably fixed; |
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146 }; |
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147 |
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148 |
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149 |
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150 |
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151 |
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152 #endif //SL_SCANDRV_H |
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153 |
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154 |