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1 // Copyright (c) 1996-2009 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\sfat32\sl_mnt32.cpp |
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15 // CFatMountCB code, specific to the EFAT32.FSY |
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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 */ |
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22 |
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23 #include "sl_std.h" |
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24 #include "sl_cache.h" |
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25 #include "sl_leafdir_cache.h" |
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26 |
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27 //------------------------------------------------------------------------------------------------------------------- |
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28 |
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29 |
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30 /** |
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31 Write aligned members of TFatBootSector to media |
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32 |
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33 @param aMediaPos media position the data will be written to |
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34 @param aBootSector data to write |
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35 @return Media write error code |
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36 */ |
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37 TInt CFatMountCB::DoWriteBootSector(TInt64 aMediaPos, const TFatBootSector& aBootSector) const |
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38 { |
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39 __PRINT2(_L("#- CFatMountCB::DoWriteBootSector() drv:%d, pos:0x%x"),Drive().DriveNumber(), (TUint32)aMediaPos); |
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40 |
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41 ASSERT(aMediaPos>=0); |
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42 |
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43 TBuf8<KDefaultSectorSize> bootSecBuf(KDefaultSectorSize); |
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44 bootSecBuf.FillZ(); |
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45 |
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46 //-- externalize boot sector to the data buffer |
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47 aBootSector.Externalize(bootSecBuf); |
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48 |
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49 //-- put a boot sector signature to the last 2 bytes |
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50 bootSecBuf[KDefaultSectorSize-2] = 0x55; |
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51 bootSecBuf[KDefaultSectorSize-1] = 0xaa; |
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52 |
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53 //-- write boot sector to the media |
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54 TInt r=LocalDrive()->Write(aMediaPos, bootSecBuf); |
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55 if (r!=KErrNone) |
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56 {//-- write failure |
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57 __PRINT2(_L("CFatMountCB::DoWriteBootSector() failed! drv:%d, code:%d"),Drive().DriveNumber(),r); |
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58 } |
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59 |
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60 return r; |
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61 } |
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62 |
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63 //------------------------------------------------------------------------------------------------------------------- |
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64 |
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65 /** |
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66 Read non aligned boot data from media into TFatBootSector structure |
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67 |
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68 @param aMediaPos media position the data will be read from |
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69 @param aBootSector refrence to TFatBootSector populate |
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70 @return Media read error code |
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71 */ |
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72 TInt CFatMountCB::DoReadBootSector(TInt64 aMediaPos, TFatBootSector& aBootSector) const |
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73 { |
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74 __PRINT2(_L("#- CFatMountCB::DoReadBootSector() drv:%d, pos:0x%x"),Drive().DriveNumber(), (TUint32)aMediaPos); |
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75 |
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76 ASSERT(aMediaPos>=0); |
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77 |
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78 TBuf8<KSizeOfFatBootSector> bootSecBuf(KSizeOfFatBootSector); |
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79 |
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80 //-- read boot sector from the media |
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81 TInt r=LocalDrive()->Read(aMediaPos, KSizeOfFatBootSector, bootSecBuf); |
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82 |
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83 if (r != KErrNone) |
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84 { |
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85 __PRINT2(_L("CFatMountCB::DoReadBootSector() failed! drv:%d, code:%d"),Drive().DriveNumber(),r); |
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86 |
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87 //-- fiddling with the error code; taken from MountL() |
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88 if (r==KErrNotSupported) |
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89 return KErrNotReady; |
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90 #if defined(_LOCKABLE_MEDIA) |
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91 else if(r==KErrLocked) |
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92 return KErrLocked; |
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93 #endif |
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94 else if (r!=KErrNoMemory && r!=KErrNotReady && r!=KErrCorrupt && r!=KErrUnknown) |
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95 return KErrCorrupt; |
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96 |
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97 return r; |
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98 } |
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99 |
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100 ASSERT(r==KErrNone); |
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101 |
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102 //-- initialise TFatBootSector object |
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103 aBootSector.Internalize(bootSecBuf); |
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104 |
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105 //-- Validate the partition size, and fix up if the out of bounds |
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106 TLocalDriveCapsV2Buf localDriveCaps; |
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107 r = LocalDrive()->Caps(localDriveCaps); |
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108 if (r != KErrNone) |
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109 { |
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110 //-- fiddling with the error code; taken from MountL() |
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111 if (r!=KErrNoMemory && r!=KErrNotReady && r!=KErrCorrupt && r!=KErrUnknown) |
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112 return KErrCorrupt; |
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113 else |
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114 return r; |
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115 } |
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116 |
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117 if(!(localDriveCaps().iMediaAtt & KMediaAttVariableSize)) |
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118 {//-- this is not a RAM drive. |
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119 const TUint32 maxSectors = I64LOW(localDriveCaps().iSize >> KDefSectorSzLog2); |
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120 |
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121 if(aBootSector.TotalSectors()) |
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122 aBootSector.SetTotalSectors(Min(aBootSector.TotalSectors(), maxSectors)); |
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123 else |
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124 aBootSector.SetHugeSectors(Min(aBootSector.HugeSectors(), maxSectors)); |
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125 } |
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126 |
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127 return KErrNone; |
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128 } |
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129 |
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130 //------------------------------------------------------------------------------------------------------------------- |
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131 |
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132 /** |
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133 Read and validate the boot sector. |
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134 If there is an error in reading the main boot sector (sec:0) or it is invalid, tries to read backup boot sector from sec:6. |
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135 Flag iMainBootSecValid indicates the validity of the main boot sector. if it is false, but ret. value is KErrNone, it means that |
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136 the backup boot sector was used and it is valid. |
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137 |
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138 @param aBootSector reference to the boot sector object to be read. |
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139 @param aDoNotReadBkBootSec if true, there won't be an attempt to read backup sector |
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140 @return standard error code. |
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141 |
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142 */ |
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143 TInt CFatMountCB::ReadBootSector(TFatBootSector& aBootSector, TBool aDoNotReadBkBootSec/*=EFalse*/) |
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144 { |
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145 iMainBootSecValid = EFalse; |
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146 |
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147 //-- read main boot sector from the sector 0 |
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148 TInt nRes = DoReadBootSector(KBootSectorNum << KDefSectorSzLog2, aBootSector); |
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149 if(nRes == KErrNone) |
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150 { |
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151 if(aBootSector.IsValid()) |
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152 { |
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153 iMainBootSecValid = ETrue; //-- main boot sector is valid, everything is OK |
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154 return KErrNone; |
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155 } |
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156 else |
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157 { |
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158 __PRINT(_L("MainBoot Sector is invalid! dump:\n")); |
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159 aBootSector.PrintDebugInfo(); |
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160 nRes = KErrCorrupt; |
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161 } |
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162 } |
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163 |
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164 ASSERT(nRes!= KErrNone && !iMainBootSecValid); |
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165 |
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166 if(aDoNotReadBkBootSec) |
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167 return nRes; |
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168 |
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169 //-- main boot sector is invalid, try backup one (it might not present at all) |
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170 __PRINT(_L("Using backup boot sector...\n")); |
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171 nRes=DoReadBootSector(KBkBootSectorNum << KDefSectorSzLog2, aBootSector); |
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172 if(nRes == KErrNone ) |
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173 { |
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174 if(aBootSector.IsValid()) |
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175 return KErrNone; //-- main boot sector is bad, but backup one is OK |
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176 else |
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177 {//-- backup boot sector is invalid |
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178 __PRINT(_L("Backup Sector is invalid! dump:\n")); |
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179 aBootSector.PrintDebugInfo(); |
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180 nRes = KErrCorrupt; |
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181 } |
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182 } |
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183 |
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184 //-- can't read boot sectors, or both are invalid |
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185 return nRes; |
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186 } |
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187 |
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188 //------------------------------------------------------------------------------------------------------------------- |
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189 |
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190 /** |
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191 Write a new volume label to BPB in media |
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192 |
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193 @param aVolumeLabel Descriptor containing the new volume label |
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194 @leave |
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195 */ |
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196 void CFatMountCB::WriteVolumeLabelL(const TDesC8& aVolumeLabel) const |
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197 { |
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198 if(aVolumeLabel.Length() > KVolumeLabelSize) |
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199 User::Leave(KErrArgument); |
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200 |
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201 const TUint32 posVolLabel = Is32BitFat() ? KFat32VolumeLabelPos : KFat16VolumeLabelPos; |
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202 User::LeaveIfError(LocalDrive()->Write(posVolLabel, aVolumeLabel)); |
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203 |
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204 } |
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205 |
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206 |
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207 //------------------------------------------------------------------------------------------------------------------- |
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208 |
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209 const TUint32 KFat32CleanShutDownMask = 0x08000000; ///< Mask used to indicate test clean/dirty bit for Fat32 |
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210 const TUint16 KFat16CleanShutDownMask = 0x08000; ///< Mask used to indicate test clean/dirty bit for Fat16 |
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211 |
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212 /** |
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213 Set or reset "VolumeClean" (ClnShutBitmask) flag. |
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214 |
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215 @param aClean if ETrue, marks the volume as clean, otherwise as dirty. |
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216 @leave if write error occured. |
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217 */ |
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218 void CFatMountCB::SetVolumeCleanL(TBool aClean) |
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219 { |
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220 |
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221 //-- The volume can't be set clean if there are objects opened on it. This precondition must be checked before calling this function |
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222 if(aClean && LockStatus()!=0) |
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223 { |
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224 __PRINT1(_L("#- CFatMountCB::SetVolumeCleanL drive:%d isn't free!"),DriveNumber()); |
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225 ASSERT(0); |
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226 User::Leave(KErrInUse); |
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227 return; |
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228 } |
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229 |
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230 if(FatType() == EFat12) |
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231 {//-- Fat12 doesn't support this feature; do nothing other than notify the underlying drive (ignoring any error for now as there's nothing we can do with it) |
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232 (void)LocalDrive()->Finalise(aClean); |
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233 return; |
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234 } |
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235 |
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236 //-- further read and write will be directly from the CProxyDrive, bypassing FAT cache. |
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237 //-- this is because CFatTable doesn't allow access to FAT[0] & FAT[1] |
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238 //-- We also need to write data through CProxyDrive, because TFatDriveInterface has a call back that can call this method |
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239 |
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240 if(Is32BitFat()) |
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241 {//-- Fat32 |
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242 __PRINT2(_L("#- CFatMountCB::SetVolumeCleanL, drive:%d, param:%d, FAT32"),DriveNumber(), aClean); |
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243 |
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244 TFat32Entry fatEntry; |
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245 const TInt KFatEntrySize=sizeof(fatEntry); //-- FAT entry size in bytes |
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246 TPtr8 ptrFatEntry((TUint8*)&fatEntry,KFatEntrySize); |
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247 |
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248 User::LeaveIfError(LocalDrive()->Read(StartOfFatInBytes()+KFatEntrySize, KFatEntrySize, ptrFatEntry)); //read FAT32[1] entry |
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249 |
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250 const TFat32Entry tmp = fatEntry; |
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251 |
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252 if(aClean) |
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253 fatEntry |= KFat32CleanShutDownMask; //-- set ClnShutBit flag |
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254 else |
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255 fatEntry &= ~KFat32CleanShutDownMask; //-- reset ClnShutBit flag |
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256 |
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257 if(tmp != fatEntry) |
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258 {//-- write FAT[1] entry to all available FATs |
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259 for(TInt i=0; i<NumberOfFats(); ++i) |
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260 { |
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261 const TInt64 pos = StartOfFatInBytes()+KFatEntrySize+(FatSizeInBytes()*i); |
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262 User::LeaveIfError(LocalDrive()->Write(pos, ptrFatEntry)); //write FAT32[1] entry |
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263 } |
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264 } |
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265 |
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266 __PRINT2(_L("#- CFatMountCB::SetVolumeCleanL() entry: %x->%x"), tmp, fatEntry); |
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267 } |
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268 else |
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269 if(Is16BitFat()) |
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270 {//-- Fat16. |
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271 __PRINT2(_L("#- CFatMountCB::SetVolumeCleanL, drive:%d, param:%d, FAT16"),DriveNumber(), aClean); |
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272 |
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273 if(FatConfig().FAT16_UseCleanShutDownBit()) |
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274 { |
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275 TFat16Entry fatEntry; |
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276 const TInt KFatEntrySize=sizeof(fatEntry); //-- FAT entry size in bytes |
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277 TPtr8 ptrFatEntry((TUint8*)&fatEntry,KFatEntrySize); |
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278 |
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279 User::LeaveIfError(LocalDrive()->Read(StartOfFatInBytes()+KFatEntrySize, KFatEntrySize, ptrFatEntry)); //read FAT16[1] entry |
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280 |
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281 const TFat16Entry tmp = fatEntry; |
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282 |
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283 if(aClean) |
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284 fatEntry |= KFat16CleanShutDownMask; //-- set ClnShutBit flag |
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285 else |
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286 fatEntry &= ~KFat16CleanShutDownMask; //-- reset ClnShutBit flag |
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287 |
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288 if(tmp != fatEntry) |
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289 {//-- write FAT[1] entry to all available FATs |
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290 for(TInt i=0; i<NumberOfFats(); ++i) |
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291 { |
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292 const TInt64 pos = StartOfFatInBytes()+KFatEntrySize+(FatSizeInBytes()*i); |
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293 User::LeaveIfError(LocalDrive()->Write(pos, ptrFatEntry)); //write FAT16[1] entry |
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294 } |
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295 } |
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296 |
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297 __PRINT2(_L("#- CFatMountCB::SetVolumeCleanL() entry: %x->%x"), tmp, fatEntry); |
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298 } |
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299 else |
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300 { |
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301 __PRINT(_L("#- changing FAT16[1] is disabled in config!")); |
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302 } |
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303 } |
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304 else |
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305 {//-- must never get here |
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306 ASSERT(0); |
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307 } |
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308 |
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309 //-- Notify the underlying media that the mount is consistent (ignoring any error for now as there's nothing we can do with it) |
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310 (void)LocalDrive()->Finalise(aClean); |
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311 |
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312 |
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313 } |
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314 |
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315 //------------------------------------------------------------------------------------------------------------------- |
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316 |
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317 /** |
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318 Determine whether "VolumeClean" (ClnShutBitmask) flag is set. |
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319 |
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320 @return ETrue if the volume is marked as clean and EFalse otherwise. |
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321 @leave if is called for FAT12 or if read error occured. |
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322 */ |
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323 TBool CFatMountCB::VolumeCleanL() |
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324 { |
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325 |
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326 //-- read access to the FAT is through TFatDriveInterface, because CFatTable doesn't allow access to FAT[1] |
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327 TFatDriveInterface& drive =DriveInterface(); |
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328 |
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329 if(Is32BitFat()) |
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330 {//-- Fat32 |
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331 TFat32Entry fatEntry; |
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332 const TInt KFatEntrySize=sizeof(fatEntry); //-- FAT entry size in bytes |
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333 TPtr8 ptrFatEntry((TUint8*)&fatEntry, KFatEntrySize); |
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334 |
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335 User::LeaveIfError(drive.ReadNonCritical(StartOfFatInBytes()+KFatEntrySize, KFatEntrySize, ptrFatEntry)); //read FAT32[1] entry |
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336 return (fatEntry & KFat32CleanShutDownMask); |
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337 } |
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338 else |
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339 if(Is16BitFat()) |
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340 {//-- Fat16 |
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341 TFat16Entry fatEntry; |
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342 const TInt KFatEntrySize=sizeof(fatEntry); //-- FAT entry size in bytes |
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343 TPtr8 ptrFatEntry((TUint8*)&fatEntry, KFatEntrySize); |
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344 |
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345 User::LeaveIfError(drive.ReadNonCritical(StartOfFatInBytes()+KFatEntrySize, KFatEntrySize, ptrFatEntry)); //read FAT16[1] entry |
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346 return (fatEntry & KFat16CleanShutDownMask); |
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347 } |
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348 else |
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349 {//-- Fat12 doesn't support this feature, shan't get here, actually |
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350 ASSERT(0); |
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351 User::Leave(KErrNotSupported); |
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352 return ETrue; //-- to satisfy the compiler |
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353 } |
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354 } |
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355 |
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356 |
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357 //------------------------------------------------------------------------------------------------------------------- |
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358 |
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359 /** |
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360 Mount a Fat volume. |
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361 |
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362 @param aForceMount Flag to indicate whether mount should be forced to succeed if an error occurs |
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363 @leave KErrNoMemory,KErrNotReady,KErrCorrupt,KErrUnknown. |
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364 */ |
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365 void CFatMountCB::MountL(TBool aForceMount) |
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366 { |
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367 |
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368 const TInt driveNo = Drive().DriveNumber(); |
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369 |
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370 __PRINT2(_L("CFatMountCB::MountL() drv:%d, forceMount=%d\n"),driveNo,aForceMount); |
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371 |
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372 ASSERT(State() == ENotMounted || State() == EDismounted); |
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373 SetState(EMounting); |
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374 SetReadOnly(EFalse); |
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375 |
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376 User::LeaveIfError(CreateDrive(driveNo)); |
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377 |
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378 |
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379 //-- read FAT configuration parameters from estart.txt |
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380 iFatConfig.ReadConfig(driveNo); |
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381 |
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382 //-- initialise interface to the low-level drive access |
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383 if(!iDriverInterface.Init(this)) |
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384 User::LeaveIfError(KErrNoMemory); |
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385 |
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386 //-- get drive capabilities |
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387 TLocalDriveCapsV2Buf capsBuf; |
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388 User::LeaveIfError(LocalDrive()->Caps(capsBuf)); |
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389 |
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390 |
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391 iSize=capsBuf().iSize; |
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392 iRamDrive = EFalse; |
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393 |
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394 if(capsBuf().iMediaAtt & KMediaAttVariableSize) |
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395 {//-- this is a RAM drive |
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396 UserSvr::UnlockRamDrive(); |
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397 iRamDrive = ETrue; |
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398 } |
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399 |
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400 if(aForceMount) |
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401 {//-- the state is "forcedly mounted", special case. This is an inconsistent state. |
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402 SetState(EInit_Forced); |
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403 return; |
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404 } |
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405 |
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406 //-- read boot sector. If main is damaged, try to use backup one instead if this is not a RAM drive. |
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407 TFatBootSector bootSector; |
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408 User::LeaveIfError(ReadBootSector(bootSector, iRamDrive)); |
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409 |
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410 |
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411 //-- print out boot sector debug information |
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412 bootSector.PrintDebugInfo(); |
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413 |
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414 //-- determine FAT type by data from boot sector. This is done by counting number of clusters, not by BPB_RootEntCnt |
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415 iFatType = bootSector.FatType(); |
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416 ASSERT(iFatType != EInvalid); //-- this shall be checked in ReadBootSector() |
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417 |
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418 |
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419 if(bootSector.RootDirEntries() == 0 && !Is32BitFat()) |
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420 {//-- FAT types mismatch. BPB_RootEntCnt is 0, which can be only for FAT32, but the number of clusters is less |
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421 //-- than required for FAT32. Probably this is incorrectly FAT32 formatted media. Put the drive into ReadOnly mode, assuming |
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422 //-- that is FAT32. |
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423 __PRINT(_L("FAT type mismatch! Setting drive to ReadOnly mode for FAT32. \n")); |
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424 iFatType = EFat32; //-- force FAT type to be FAT32 |
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425 SetReadOnly(ETrue); |
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426 } |
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427 |
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428 //-- store volume UID, it can be checked on Remount |
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429 iUniqueID = bootSector.UniqueID(); |
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430 |
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431 //-- populate volume parameters with the values from boot sector. They had been validated in TFatBootSector::IsValid() |
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432 iVolParam.Populate(bootSector); |
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433 |
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434 //-- initialize the volume |
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435 InitializeL(capsBuf()); |
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436 ASSERT(State()==EInit_R); |
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437 |
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438 GetVolumeLabelFromDiskL(bootSector); |
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439 |
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440 __PRINT2(_L("CFatMountCB::MountL() Completed, drv: %d, state:%d"), DriveNumber(), State()); |
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441 } |
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442 |
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443 |
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444 |
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445 //------------------------------------------------------------------------------------------------------------------- |
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446 |
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447 /** |
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448 Initialize the FAT cache and disk access |
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449 |
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450 @param aLocDrvCaps local drive capabilities |
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451 @param aIgnoreFSInfo if ETrue, FSInfo sector shall be ignored. Used on volume remount to force FAT free clusters counting. |
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452 |
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453 @leave KErrNoMemory,KErrNotReady,KErrCorrupt,KErrUnknown. |
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454 */ |
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455 void CFatMountCB::InitializeL(const TLocalDriveCaps& aLocDrvCaps, TBool aIgnoreFSInfo/*=EFalse*/) |
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456 { |
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457 __PRINT1(_L("CFatMountCB::InitializeL() drv:%d"), DriveNumber()); |
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458 |
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459 ASSERT(State() == EMounting); //-- we must get here only from MountL() |
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460 |
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461 //========== Find out number of clusters on the volume |
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462 if(iRamDrive && SectorsPerCluster()!=1) |
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463 {// Align iFirstFreeByte to cluster boundary if internal ram drive |
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464 const TInt sectorsPerClusterLog2=ClusterSizeLog2()-SectorSizeLog2(); |
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465 const TInt rootDirEndSector=RootDirEnd()>>SectorSizeLog2(); |
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466 const TInt alignedSector=((rootDirEndSector+SectorsPerCluster()-1)>>sectorsPerClusterLog2)<<sectorsPerClusterLog2; |
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467 iFirstFreeByte=alignedSector<<SectorSizeLog2(); |
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468 } |
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469 else |
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470 { |
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471 if(Is32BitFat()) |
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472 iFirstFreeByte=(NumberOfFats() * FatSizeInBytes()) + (FirstFatSector() << SectorSizeLog2()); |
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473 else |
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474 iFirstFreeByte=RootDirEnd(); |
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475 } |
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476 |
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477 |
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478 {//-- check if volume geometry looks valid |
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479 const TInt usableSectors=TotalSectors()-(iFirstFreeByte>>SectorSizeLog2()); |
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480 iUsableClusters=usableSectors>>(ClusterSizeLog2()-SectorSizeLog2()); |
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481 |
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482 const TUint32 KMinClusters = 32; //-- absolute minimum number of clusters on the volume |
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483 const TUint32 KMaxClusters=(TotalSectors()-FirstFatSector()-NumberOfFats()*(FatSizeInBytes()>>SectorSizeLog2())) >> (ClusterSizeLog2()-SectorSizeLog2()); |
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484 |
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485 if(usableSectors <=0 || iUsableClusters < KMinClusters || iUsableClusters > KMaxClusters) |
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486 { |
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487 __PRINT(_L("CFatMountCB::InitializeL() Wrong number of usable cluster/sectors on the volume!")); |
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488 User::Leave(KErrCorrupt); |
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489 } |
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490 } |
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491 |
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492 //========== initialise RawDisk interface |
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493 //-- CFatMountCB parameters might have changed, e.g. after formatting. Reconstruct directory cache with new parameters |
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494 |
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495 delete iRawDisk; |
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496 iRawDisk=CRawDisk::NewL(*this, aLocDrvCaps); |
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497 iRawDisk->InitializeL(); |
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498 |
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499 |
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500 //========== Try to read FSInfo and deduct number of free clusters and other information from there |
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501 TBool bUseDataFromFsInfo = !aIgnoreFSInfo && Is32BitFat(); //-- if ETrue, we are going to use data from FSInfo sector (applicable for FAT32 only) |
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502 |
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503 //-- main boot sector shall be valid, otherwise we can't trust data from FSInfo |
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504 bUseDataFromFsInfo = bUseDataFromFsInfo && iMainBootSecValid; |
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505 |
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506 //-- 1. check if using FSInfo is disabled in config |
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507 if(bUseDataFromFsInfo && !FatConfig().FAT32_UseFSInfoOnMount()) |
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508 { |
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509 __PRINT(_L("#- FSInfo using is disabled in config!")); |
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510 bUseDataFromFsInfo = EFalse; |
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511 } |
|
512 |
|
513 #ifdef _DEBUG |
|
514 //-- 2. check if FSInfo is disabled by test interface (special debug property). This property is defined and set by the test application. |
|
515 TInt nMntDebugFlags; |
|
516 if(bUseDataFromFsInfo && RProperty::Get(KSID_Test1, DriveNumber(), nMntDebugFlags) == KErrNone) |
|
517 {//-- test property for this drive is defined |
|
518 if(nMntDebugFlags & KMntDisable_FsInfo) |
|
519 { |
|
520 __PRINT(_L("#- FSInfo using is disabled by debug interface.")); |
|
521 bUseDataFromFsInfo = EFalse; |
|
522 } |
|
523 } |
|
524 #endif |
|
525 |
|
526 //-- 3. try to read FSInfoSector and its copy if the volume had been properly shut down before (is now clean) |
|
527 CFatTable::TMountParams fatMntParams; |
|
528 bUseDataFromFsInfo = bUseDataFromFsInfo && VolumeCleanL(); |
|
529 if(bUseDataFromFsInfo) |
|
530 { |
|
531 bUseDataFromFsInfo = ProcessFSInfoSectors(fatMntParams); |
|
532 if(!bUseDataFromFsInfo) |
|
533 { |
|
534 __PRINT1(_L("#- CFatMountCB::ProcessFSInfoSectors() failed. drv:%d"), DriveNumber()); |
|
535 } |
|
536 } |
|
537 |
|
538 //========== create and initialise FAT table |
|
539 |
|
540 delete iFatTable; |
|
541 iFatTable=CFatTable::NewL(*this, aLocDrvCaps); |
|
542 |
|
543 //-- mount the FAT table. Depending on mount parameters and configuration this method |
|
544 //-- can do various things, like counting free clusters synchronously if data from FSInfo isn't valid, |
|
545 //-- or setting up a FAT backround thread and return immediately etc. |
|
546 iFatTable->MountL(fatMntParams); |
|
547 |
|
548 SetState(EInit_R); //-- the state is "Initialized, but not writen" |
|
549 |
|
550 //-- make a callback, telling FileServer about free space discovered. |
|
551 const TInt64 freeSpace = ((TInt64)FAT().NumberOfFreeClusters()) << ClusterSizeLog2(); |
|
552 SetDiskSpaceChange(freeSpace); |
|
553 //========== create and setup leaf direcotry cache if cache limit is set bigger than one |
|
554 |
|
555 const TUint32 cacheLimit = iFatConfig.LeafDirCacheSize(); |
|
556 if (cacheLimit > 1) |
|
557 { |
|
558 // destroy the old leaf dir cache to avoid memory leak. |
|
559 delete iLeafDirCache; |
|
560 iLeafDirCache = CLeafDirCache::NewL(cacheLimit); |
|
561 } |
|
562 else |
|
563 { |
|
564 iLeafDirCache = NULL; |
|
565 } |
|
566 |
|
567 __PRINT3(_L("#- CFatMountCB::InitializeL() done. drv:%d, Free clusters:%d, 1st Free cluster:%d"),DriveNumber(), FAT().NumberOfFreeClusters(), FAT().FreeClusterHint()); |
|
568 |
|
569 |
|
570 } |
|
571 |
|
572 //------------------------------------------------------------------------------------------------------------------- |
|
573 |
|
574 /** |
|
575 Write FSInfo sectors to the media |
|
576 |
|
577 @param aMediaPos Media position to write FSInfo sector to |
|
578 @param aFSInfo FSInfo structure to write |
|
579 @return System wide error code |
|
580 */ |
|
581 TInt CFatMountCB::WriteFSInfoSector(TInt64 aMediaPos, const TFSInfo& aFSInfo) const |
|
582 { |
|
583 __PRINT2(_L("#- CFatMountCB::WriteFSInfoSector() drv:%d, pos:0x%x"),Drive().DriveNumber(), (TUint32)aMediaPos); |
|
584 |
|
585 ASSERT(aMediaPos >= 0 && aMediaPos < FirstFatSector()<<SectorSizeLog2()); |
|
586 ASSERT(Is32BitFat()); |
|
587 |
|
588 TBuf8<KSizeOfFSInfo> fsInfoSecBuf; |
|
589 |
|
590 //-- put data to the sector buffer |
|
591 aFSInfo.Externalize(fsInfoSecBuf); |
|
592 |
|
593 TInt r=LocalDrive()->Write(aMediaPos, fsInfoSecBuf); |
|
594 if (r!=KErrNone) |
|
595 { |
|
596 __PRINT2(_L("CFatMountCB::WriteFSInfoSector() failed! drv:%d, code:%d"),Drive().DriveNumber(),r); |
|
597 } |
|
598 |
|
599 return r; |
|
600 } |
|
601 |
|
602 //------------------------------------------------------------------------------------------------------------------- |
|
603 /** |
|
604 Read the FSInfo structure from media |
|
605 |
|
606 @param aMediaPos Media position to read FSInfo sector from |
|
607 @param aFSInfo data read from FSInfo structure |
|
608 @return System wide error code |
|
609 */ |
|
610 TInt CFatMountCB::ReadFSInfoSector(TInt64 aMediaPos, TFSInfo& aFSInfo) const |
|
611 { |
|
612 __PRINT2(_L("#- CFatMountCB::ReadFSInfoSector() drv:%d, pos:0x%x"),Drive().DriveNumber(), (TUint32)aMediaPos); |
|
613 |
|
614 ASSERT(aMediaPos >= 0 && aMediaPos < FirstFatSector()<<SectorSizeLog2()); |
|
615 ASSERT(Is32BitFat()); |
|
616 |
|
617 TBuf8<KSizeOfFSInfo> fsInfoSecBuf; |
|
618 |
|
619 TInt r=LocalDrive()->Read(aMediaPos, KSizeOfFSInfo, fsInfoSecBuf); |
|
620 if (r!=KErrNone) |
|
621 { |
|
622 __PRINT2(_L("CFatMountCB::ReadFSInfoSector() failed! drv:%d, code:%d"),Drive().DriveNumber(),r); |
|
623 return r; |
|
624 } |
|
625 |
|
626 //-- take FSInfo data from the buffer |
|
627 aFSInfo.Internalize(fsInfoSecBuf); |
|
628 |
|
629 return KErrNone; |
|
630 } |
|
631 |
|
632 /** |
|
633 Checks for end of file for all Fat types |
|
634 |
|
635 @param aCluster Cluster to check |
|
636 @return Result of test |
|
637 */ |
|
638 TBool CFatMountCB::IsEndOfClusterCh(TInt aCluster) const |
|
639 { |
|
640 if(Is32BitFat()) |
|
641 return(aCluster>=(TInt)0x0FFFFFF8 && aCluster<=(TInt)0x0FFFFFFF); |
|
642 else if(Is16BitFat()) |
|
643 return(aCluster>=0xFFF8 && aCluster<=0xFFFF); |
|
644 else |
|
645 return(aCluster>=0xFF8 && aCluster<=0xFFF); |
|
646 } |
|
647 |
|
648 /** |
|
649 Set a cluster to the end of cluster chain marker |
|
650 |
|
651 @param aCluster cluster to set to end of chain marker |
|
652 */ |
|
653 void CFatMountCB::SetEndOfClusterCh(TInt &aCluster) const |
|
654 { |
|
655 if(Is32BitFat()) |
|
656 aCluster=EOF_32Bit; |
|
657 else if(Is16BitFat()) |
|
658 aCluster=EOF_16Bit; |
|
659 else |
|
660 aCluster=EOF_12Bit; |
|
661 } |
|
662 |
|
663 /** |
|
664 Initialize data to represent the root directory |
|
665 |
|
666 @param anEntry Entry to initialise |
|
667 */ |
|
668 void CFatMountCB::InitializeRootEntry(TFatDirEntry & anEntry) const |
|
669 { |
|
670 anEntry.SetName(_L8("ROOT")); |
|
671 anEntry.SetAttributes(KEntryAttDir); |
|
672 anEntry.SetStartCluster(RootClusterNum()); //--iRootClusterNum is 0 for FAT12/16 |
|
673 } |
|
674 |
|
675 |
|
676 |
|
677 /** |
|
678 Implementation of CMountCB::FileSystemSubType(). Retrieves the sub type of Fat file system |
|
679 and returns the name as a descriptor. |
|
680 |
|
681 @param aName Name of the sub type of Fat file system |
|
682 @return KErrNone if successful; KErrArgument if aName is not long enough; KErrNotReady if |
|
683 the mount is not ready. |
|
684 |
|
685 @see CMountCB::FileSystemSubType() |
|
686 */ |
|
687 TInt CFatMountCB::SubType(TDes& aName) const |
|
688 { |
|
689 if(aName.MaxLength() < 5) |
|
690 return KErrArgument; |
|
691 |
|
692 switch (iFatType) |
|
693 { |
|
694 case EFat12: |
|
695 { |
|
696 aName = KFSSubType_FAT12; |
|
697 return KErrNone; |
|
698 } |
|
699 case EFat16: |
|
700 { |
|
701 aName = KFSSubType_FAT16; |
|
702 return KErrNone; |
|
703 } |
|
704 case EFat32: |
|
705 { |
|
706 aName = KFSSubType_FAT32; |
|
707 return KErrNone; |
|
708 } |
|
709 default: |
|
710 // case EInvalidFatType |
|
711 return KErrNotReady; |
|
712 } |
|
713 } |
|
714 |
|
715 |
|
716 //------------------------------------------------------------------------------------------------------------------- |
|
717 |
|
718 /** |
|
719 Try to extract useful information from the FSInfo sectors. |
|
720 The information from FSInfo sectors will be trusted only if there are main and backup sectors, |
|
721 they are both valid and the same. |
|
722 |
|
723 @param aFatInitParams on success will contain the number of free clusters on the volume and 1st free cluster number from the FSInfo |
|
724 @return ETrue on success. |
|
725 */ |
|
726 TBool CFatMountCB::ProcessFSInfoSectors(CFatTable::TMountParams& aFatInitParams) const |
|
727 { |
|
728 |
|
729 aFatInitParams.iFreeClusters = 0; |
|
730 aFatInitParams.iFirstFreeCluster = 0; |
|
731 aFatInitParams.iFsInfoValid = EFalse; |
|
732 |
|
733 const TUint32 currFsInfoSec = iVolParam.FSInfoSectorNum(); //-- values from the boot sector |
|
734 const TUint32 currFsInfoBkSec = iVolParam.BkFSInfoSectorNum(); |
|
735 |
|
736 if(!Is32BitFat() || currFsInfoSec < KFSInfoSectorNum || currFsInfoSec >= FirstFatSector()) |
|
737 { |
|
738 ASSERT(0); //-- main FSInfo sector must have sensible location |
|
739 return EFalse; |
|
740 } |
|
741 |
|
742 if(currFsInfoBkSec < KFSInfoSectorNum || currFsInfoBkSec >= FirstFatSector() || currFsInfoBkSec <= currFsInfoSec) |
|
743 return EFalse; //-- something is wrong with backup copy location |
|
744 |
|
745 TFSInfo fsInfo; |
|
746 TInt nRes; |
|
747 |
|
748 //-- 1. read and validate main FS Info sector |
|
749 nRes = ReadFSInfoSector(currFsInfoSec << SectorSizeLog2(), fsInfo); |
|
750 if(nRes != KErrNone) |
|
751 return EFalse; |
|
752 |
|
753 fsInfo.PrintDebugInfo(); |
|
754 |
|
755 if(!fsInfo.IsValid()) |
|
756 return EFalse; |
|
757 |
|
758 const TUint32 freeCount=fsInfo.FreeClusterCount(); // last known free cluster count |
|
759 const TUint32 nextFree =fsInfo.NextFreeCluster(); // hint to file system as to where to start looking for free clusters |
|
760 |
|
761 //-- 2. read and check backup FS Info sector, it must be the same as the main one |
|
762 nRes = ReadFSInfoSector(currFsInfoBkSec << SectorSizeLog2(), fsInfo); |
|
763 |
|
764 if(nRes != KErrNone || !fsInfo.IsValid() || freeCount != fsInfo.FreeClusterCount() || nextFree != fsInfo.NextFreeCluster()) |
|
765 { |
|
766 __PRINT(_L("#- CFatMountCB::ProcessFSInfoSectors(): copies of FSInfo are different!")); |
|
767 return EFalse; |
|
768 } |
|
769 |
|
770 if(freeCount < 1 || freeCount > UsableClusters()) |
|
771 return EFalse; //-- looks like invalid value |
|
772 |
|
773 if(nextFree < KFatFirstSearchCluster || nextFree >= UsableClusters()+KFatFirstSearchCluster) |
|
774 return EFalse; //-- looks like invalid value |
|
775 |
|
776 //-- success |
|
777 aFatInitParams.iFreeClusters = freeCount; |
|
778 aFatInitParams.iFirstFreeCluster = nextFree; |
|
779 aFatInitParams.iFsInfoValid = ETrue; |
|
780 |
|
781 return ETrue; |
|
782 } |
|
783 |
|
784 //------------------------------------------------------------------------------------------------------------------- |
|
785 /** |
|
786 Internal helper method. Writes FSInfo sector and its backup copy to the volume if necessary. |
|
787 |
|
788 @param aInvalidateFSInfo if ETrue, FSInfo data (free clusters count) will be invalidated. |
|
789 otherwise, data from the CFatTable object will be used |
|
790 |
|
791 @leave if disk opertion fails |
|
792 */ |
|
793 void CFatMountCB::DoUpdateFSInfoSectorsL(TBool aInvalidateFSInfo) |
|
794 { |
|
795 __PRINT2(_L("#- CFatMountCB::DoUpdateFSInfoSectorsL(%d) drv:%d"),aInvalidateFSInfo, Drive().DriveNumber()); |
|
796 |
|
797 ASSERT(Is32BitFat()); |
|
798 |
|
799 if(!aInvalidateFSInfo) |
|
800 { |
|
801 ASSERT(FAT().ConsistentState()); |
|
802 } |
|
803 |
|
804 //-- 1. check that FSInfoSector numbers are valid |
|
805 TBool bCanWriteFSInfo_Main = EFalse;//-- if ETrue, it's OK to write main FSInfo sector |
|
806 TBool bCanWriteFSInfo_Bk = EFalse; //-- if ETrue, it's OK to write backup FSInfo sector |
|
807 |
|
808 const TUint32 currFsInfoSec = iVolParam.FSInfoSectorNum(); //-- values from the boot sector |
|
809 const TUint32 currFsInfoBkSec = iVolParam.BkFSInfoSectorNum(); |
|
810 |
|
811 if(currFsInfoSec > 0 && currFsInfoSec < FirstFatSector()) |
|
812 {//-- seems to be OK |
|
813 bCanWriteFSInfo_Main = ETrue; |
|
814 } |
|
815 else |
|
816 { |
|
817 __PRINT1(_L("#- DoUpdateFSInfoSectorsL() iFSInfoSectorNum is wrong!: sec:%d"), currFsInfoSec); |
|
818 } |
|
819 |
|
820 if(currFsInfoBkSec > 0 && currFsInfoBkSec < FirstFatSector() && currFsInfoBkSec > currFsInfoSec) |
|
821 {//-- seems to be OK |
|
822 bCanWriteFSInfo_Bk = bCanWriteFSInfo_Main; |
|
823 } |
|
824 else |
|
825 { |
|
826 __PRINT1(_L("#- DoUpdateFSInfoSectorsL() iBkFSInfoSectorNum is wrong!: sec:%d"),currFsInfoBkSec); |
|
827 } |
|
828 |
|
829 if(!bCanWriteFSInfo_Main && !bCanWriteFSInfo_Bk) |
|
830 return; //-- nothing to do |
|
831 |
|
832 |
|
833 const TUint32 KFsInfoSecPos_Main = currFsInfoSec << SectorSizeLog2(); //-- main FSInfo sector media position |
|
834 const TUint32 KFsInfoSecPos_Bk = currFsInfoBkSec << SectorSizeLog2(); //-- backup FSInfo sector media position |
|
835 |
|
836 TFSInfo fsInfoSector; |
|
837 |
|
838 TBool bNeedWriteFSInfo_Main = EFalse; |
|
839 TBool bNeedWriteFSInfo_Bk = EFalse; |
|
840 |
|
841 |
|
842 const TUint32 KInvalidVal = 0xFFFFFFFF; //-- invalid value for FSInfo fields, see FAT specs |
|
843 |
|
844 //-- we need here _exact_ number of free clusters, so make FAT().NumberOfFreeClusters() operation synchronous |
|
845 const TUint32 KFreeClusters = aInvalidateFSInfo ? KInvalidVal : FAT().NumberOfFreeClusters(ETrue); |
|
846 const TUint32 KNextFreeCluster = aInvalidateFSInfo ? KInvalidVal : FAT().FreeClusterHint(); |
|
847 |
|
848 //-- check if the main FSInfo sector differs from the FAT information |
|
849 if(bCanWriteFSInfo_Main) |
|
850 { |
|
851 User::LeaveIfError(ReadFSInfoSector(KFsInfoSecPos_Main, fsInfoSector)); |
|
852 bNeedWriteFSInfo_Main = !fsInfoSector.IsValid() || |
|
853 fsInfoSector.FreeClusterCount() != KFreeClusters || |
|
854 fsInfoSector.NextFreeCluster() != KNextFreeCluster; |
|
855 } |
|
856 |
|
857 //-- check if the backup FSInfo sector differs from the FAT information |
|
858 if(bCanWriteFSInfo_Bk) |
|
859 { |
|
860 User::LeaveIfError(ReadFSInfoSector(KFsInfoSecPos_Bk, fsInfoSector)); |
|
861 bNeedWriteFSInfo_Bk = !fsInfoSector.IsValid() || |
|
862 fsInfoSector.FreeClusterCount() != KFreeClusters || |
|
863 fsInfoSector.NextFreeCluster() != KNextFreeCluster; |
|
864 } |
|
865 |
|
866 //-- setup data in FSInfo sector to write |
|
867 fsInfoSector.Initialise(); |
|
868 fsInfoSector.SetFreeClusterCount(KFreeClusters); |
|
869 fsInfoSector.SetNextFreeCluster(KNextFreeCluster); |
|
870 |
|
871 if(!bNeedWriteFSInfo_Main && !bNeedWriteFSInfo_Bk) |
|
872 return; //-- nothing to do |
|
873 |
|
874 SetVolumeCleanL(EFalse); //-- mark volume dirty, just in case something will happen on FSInfo sectors write |
|
875 |
|
876 if(bNeedWriteFSInfo_Main) |
|
877 User::LeaveIfError(WriteFSInfoSector(KFsInfoSecPos_Main, fsInfoSector)); |
|
878 |
|
879 if(bNeedWriteFSInfo_Bk) |
|
880 User::LeaveIfError(WriteFSInfoSector(KFsInfoSecPos_Bk, fsInfoSector)); |
|
881 |
|
882 } |
|
883 |
|
884 //------------------------------------------------------------------------------------------------------------------- |
|
885 |
|
886 /** |
|
887 CFatMountCB control method. |
|
888 @param aLevel specifies the operation to perfrom on the mount |
|
889 @param aOption specific option for the given operation |
|
890 @param aParam pointer to generic parameter, its meaning depends on aLevel and aOption |
|
891 |
|
892 @return standard error code. |
|
893 */ |
|
894 TInt CFatMountCB::MountControl(TInt aLevel, TInt aOption, TAny* aParam) |
|
895 { |
|
896 __PRINT3(_L("CFatMountCB::MountControl() drv:%d, level:%d, opt:%d"),Drive().DriveNumber(), aLevel, aOption); |
|
897 |
|
898 TInt nRes = KErrNotSupported; |
|
899 |
|
900 if(aLevel == ECheckFsMountable) |
|
901 { |
|
902 return MntCtl_DoCheckFileSystemMountable(); |
|
903 } |
|
904 |
|
905 //-- todo: move these functions code into separate methods ?? |
|
906 |
|
907 //-- mount state query: check if is in finalised state |
|
908 if(aLevel == EMountStateQuery && aOption == ESQ_IsMountFinalised) |
|
909 { |
|
910 TBool bFinalised; |
|
911 nRes = IsFinalised(bFinalised); |
|
912 if(nRes == KErrNone) |
|
913 { |
|
914 *((TBool*)aParam) = bFinalised; |
|
915 } |
|
916 |
|
917 return nRes; |
|
918 } |
|
919 |
|
920 //-- mount-specific volume parameters queries that might not be handled by CFatMountCB::VolumeL |
|
921 if(aLevel == EMountVolParamQuery) |
|
922 { |
|
923 ASSERT(ConsistentState()); //-- volume state shall be consistent, otherwise its parameters do not make sense |
|
924 switch(aOption) |
|
925 { |
|
926 //-- Request a certain amount of free space on the volume. |
|
927 case ESQ_RequestFreeSpace: |
|
928 { |
|
929 TUint64* pVal = (TUint64*)aParam; //-- in: number of free bytes on the volume required, out: resulted amount of free space. |
|
930 const TUint32 KClustersRequired = (TUint32)((*pVal + ClusterSize() - 1) >> ClusterSizeLog2()); |
|
931 __PRINT2(_L("MountControl() ReqFreeSpace:%LU, clusters:%d"), *pVal, KClustersRequired); |
|
932 |
|
933 if(KClustersRequired) |
|
934 {//-- actually, this doesn't guarantee that it will finally be KClustersRequired available. |
|
935 (void)FAT().RequestFreeClusters(KClustersRequired); |
|
936 } |
|
937 |
|
938 const TUint32 freeClusters = FAT().NumberOfFreeClusters(EFalse); //-- _current_ amount of free clusters |
|
939 *pVal = (TInt64)freeClusters << ClusterSizeLog2(); |
|
940 |
|
941 return KErrNone; |
|
942 } |
|
943 |
|
944 //-- A request to obtain the _current_ amount of free space on the volume asynchronously, without blocking. |
|
945 case ESQ_GetCurrentFreeSpace: |
|
946 { |
|
947 TUint64* pVal = (TUint64*)aParam; //-- out: resulted amount of free space. |
|
948 |
|
949 const TUint32 freeClusters = FAT().NumberOfFreeClusters(EFalse); //-- _current_ amount of free clusters |
|
950 *pVal = (TInt64)freeClusters << ClusterSizeLog2(); |
|
951 __PRINT1(_L("MountControl() Asynch. request; curent amount of free clusters: %d"), freeClusters); |
|
952 |
|
953 return KErrNone; |
|
954 } |
|
955 |
|
956 //-- A request to obtain size of the mounted volume without blocking (CMountCB::VolumeL() can block). |
|
957 case ESQ_MountedVolumeSize: |
|
958 { |
|
959 if(iRamDrive) |
|
960 return KErrNotSupported; //-- it requires knowledge of free space on the volume |
|
961 |
|
962 TUint64* pVal = (TUint64*)aParam; |
|
963 *pVal = iSize; //-- physical drive size |
|
964 |
|
965 //-- take into account space occupied by FAT table, etc. |
|
966 *pVal -= ClusterBasePosition(); |
|
967 *pVal=(*pVal >> ClusterSizeLog2()) << ClusterSizeLog2(); //-- round down to cluster size |
|
968 |
|
969 __PRINT1(_L("MountControl() MountedVolumeSize:%LU"), *pVal); |
|
970 return KErrNone; |
|
971 } |
|
972 |
|
973 default: |
|
974 __PRINT1(_L("MountControl() unsupported opt:%d"), aOption); |
|
975 ASSERT(0); |
|
976 break; |
|
977 }; |
|
978 |
|
979 } |
|
980 |
|
981 //-- File System - specific queries |
|
982 if(aLevel == EMountFsParamQuery && aOption == ESQ_GetMaxSupportedFileSize) |
|
983 {//-- this is a query to provide the max. supported file size; aParam is a pointer to TUint64 to return the value |
|
984 *(TUint64*)aParam = KMaxSupportedFatFileSize; |
|
985 return KErrNone; |
|
986 } |
|
987 |
|
988 |
|
989 |
|
990 |
|
991 return KErrNotSupported; |
|
992 } |
|
993 |
|
994 //----------------------------------------------------------------------------------------- |
|
995 |
|
996 /** |
|
997 Reports whether the specified interface is supported - if it is, |
|
998 the supplied interface object is modified to it |
|
999 |
|
1000 @param aInterfaceId The interface of interest |
|
1001 @param aInterface The interface object |
|
1002 @return KErrNone if the interface is supported, otherwise KErrNotFound |
|
1003 |
|
1004 @see CMountCB::GetInterface() |
|
1005 */ |
|
1006 TInt CFatMountCB::GetInterface(TInt aInterfaceId, TAny*& aInterface,TAny* aInput) |
|
1007 { |
|
1008 switch(aInterfaceId) |
|
1009 { |
|
1010 case (CMountCB::EFileAccessor): |
|
1011 ((CMountCB::MFileAccessor*&) aInterface) = this; |
|
1012 return KErrNone; |
|
1013 |
|
1014 case (CMountCB::EGetFileSystemSubType): |
|
1015 aInterface = (MFileSystemSubType*) (this); |
|
1016 return KErrNone; |
|
1017 |
|
1018 case (CMountCB::EGetClusterSize): |
|
1019 aInterface = (MFileSystemClusterSize*) (this); |
|
1020 return KErrNone; |
|
1021 |
|
1022 case CMountCB::ELocalBufferSupport: |
|
1023 // RAM drives doesn't support local buffers (this results in file caching being disabled) |
|
1024 if (iRamDrive) |
|
1025 return KErrNotSupported; |
|
1026 else |
|
1027 return LocalDrive()->LocalBufferSupport(); |
|
1028 |
|
1029 case EGetProxyDrive: |
|
1030 ((CProxyDrive*&)aInterface) = LocalDrive(); |
|
1031 return KErrNone; |
|
1032 |
|
1033 case CMountCB::EFileExtendedInterface: |
|
1034 // For supporting large file ReadFileSection |
|
1035 ((CMountCB::MFileExtendedInterface*&) aInterface) = this; |
|
1036 return KErrNone; |
|
1037 |
|
1038 default: |
|
1039 return(CMountCB::GetInterface(aInterfaceId, aInterface, aInput)); |
|
1040 } |
|
1041 } |
|
1042 |
|
1043 //----------------------------------------------------------------------------------------- |
|
1044 void CFatMountCB::ReadSection64L(const TDesC& aName, TInt64 aPos, TAny* aTrg, TInt aLength, const RMessagePtr2& aMessage) |
|
1045 // From CMountCB::MFileExtendedInterface |
|
1046 { |
|
1047 __PRINT(_L("CFatMountCB::ReadSection64L")); |
|
1048 |
|
1049 CheckStateConsistentL(); |
|
1050 TEntryPos dosEntryPos(RootIndicator(),0); |
|
1051 TFatDirEntry dosEntry; |
|
1052 TFileName fileName; |
|
1053 |
|
1054 TInt namePos=aName.LocateReverse(KPathDelimiter)+1; // There is always a path delimiter |
|
1055 TLeafDirData leafDir(0); |
|
1056 dosEntryPos.iCluster=FindLeafDirL(aName.Left(namePos), leafDir); |
|
1057 dosEntryPos.iPos=0; |
|
1058 TEntryPos firstEntryPos; |
|
1059 TFatDirEntry firstEntry; |
|
1060 DoFindL(aName.Mid(namePos),KEntryAttMaskSupported, |
|
1061 firstEntryPos,firstEntry,dosEntryPos,dosEntry, |
|
1062 fileName,KErrNotFound, |
|
1063 NULL, |
|
1064 leafDir); |
|
1065 |
|
1066 // Check that reading from aPos for aLength lies within the file |
|
1067 // if aPos is within the file, and aLength is too long, read up to EOF |
|
1068 // If aPos is beyond the end of the file, return a zero length descriptor |
|
1069 |
|
1070 TInt64 fileSize = MAKE_TINT64(0,dosEntry.Size()); |
|
1071 if (aPos>=fileSize) |
|
1072 User::Leave(KErrEof); |
|
1073 |
|
1074 if (aPos+aLength>fileSize) |
|
1075 aLength=(TInt)(fileSize-aPos); |
|
1076 |
|
1077 TInt cluster=StartCluster(dosEntry); |
|
1078 TInt64 pos = aPos; |
|
1079 |
|
1080 TInt endCluster; |
|
1081 TInt clusterSize=1<<ClusterSizeLog2(); // Size of file clusters |
|
1082 TInt readTotal = 0; |
|
1083 |
|
1084 // Total number of clusters in file |
|
1085 TInt maxClusters=(TInt)((fileSize+clusterSize-1)>>ClusterSizeLog2()); |
|
1086 |
|
1087 // Read data |
|
1088 FOREVER |
|
1089 { |
|
1090 // Get the maximum number of clusters that can be read contiguously |
|
1091 TInt64 clusterListLen=FAT().CountContiguousClustersL(cluster,endCluster,maxClusters); |
|
1092 __ASSERT_DEBUG(clusterListLen>0,Fault(EReadFileSectionFailed)); |
|
1093 |
|
1094 // If start position within this block, then read some data |
|
1095 if (pos<(clusterListLen<<ClusterSizeLog2())) |
|
1096 { |
|
1097 // Read the remaining length or the entire cluster block whichever is smaller |
|
1098 TInt readLength = (TInt)Min((TInt64)(aLength-readTotal),(clusterListLen<<ClusterSizeLog2())-pos); |
|
1099 __ASSERT_DEBUG(readLength>0,Fault(EReadFileSectionFailed)); |
|
1100 TInt64 dataAddress=(FAT().DataPositionInBytes(cluster))+pos; |
|
1101 iRawDisk->ReadL(dataAddress,readLength,aTrg,aMessage,readTotal); |
|
1102 readTotal += readLength; |
|
1103 |
|
1104 if (readTotal == aLength) |
|
1105 return; |
|
1106 |
|
1107 pos += readLength; |
|
1108 } |
|
1109 |
|
1110 // Get the next cluster in file |
|
1111 pos-=(clusterListLen<<ClusterSizeLog2()); |
|
1112 #if defined(_DEBUG) |
|
1113 TBool remainingClusters= |
|
1114 #endif |
|
1115 ((CFatMountCB*)this)->FAT().GetNextClusterL(endCluster); |
|
1116 __ASSERT_DEBUG(remainingClusters,Fault(EReadFileSectionFailed)); |
|
1117 cluster=endCluster; |
|
1118 } |
|
1119 } |