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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\sfat\sl_vfat.cpp |
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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 //!! |
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21 //!! WARNING!! DO NOT edit this file !! '\sfat' component is obsolete and is not being used. '\sfat32'replaces it |
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22 //!! |
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23 //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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24 //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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25 |
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26 |
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27 #include "sl_std.h" |
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28 #include "sl_cache.h" |
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29 #include <e32svr.h> |
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30 #include <e32math.h> |
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31 |
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32 |
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33 IMPORT_C const TFatUtilityFunctions* GetFatUtilityFunctions(); |
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34 |
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35 const TInt KMaxLengthWithoutTilde = 8; |
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36 const TUint8 KLeadingE5Replacement = 0x05; |
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37 |
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38 // use second half of ISO Latin 1 character set for extended chars |
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39 const TUint KExtendedCharStart=0x80; |
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40 const TUint KExtendedCharEnd=0xff; |
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41 |
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42 LOCAL_C TBool IsLegalChar(TChar aCharacter,TBool aAllowWildChars,TBool aUseExtendedChars=EFalse,TBool aInScanDrive=EFalse) |
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43 // |
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44 // Returns ETrue if aCharacter is legal inside a dos filename |
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45 // |
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46 { |
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47 if ((aCharacter==KMatchOne) || (aCharacter==KMatchAny)) |
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48 return(aAllowWildChars); |
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49 if ((TUint)aCharacter < 0x20) |
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50 return EFalse; |
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51 // Don't check illegal ascii char because some non-English char value may |
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52 // fall in this area |
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53 if (aInScanDrive) |
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54 return ETrue; |
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55 return LocaleUtils::IsLegalShortNameCharacter(aCharacter,aUseExtendedChars); |
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56 } |
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57 |
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58 LOCAL_C void ReplaceFirstCharacterIfClashesWithE5L(TDes8& aShortName) |
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59 { |
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60 if (0 < aShortName.Length() && aShortName[0] == KEntryErasedMarker) |
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61 { |
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62 aShortName[0] = KLeadingE5Replacement; |
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63 } |
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64 } |
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65 |
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66 LOCAL_C void ReplaceIllegalCharactersL(TDes& aLongName, TUint aCharacterToReplaceWith) |
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67 { |
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68 TBool alreadyFoundExtensionDelimiter=EFalse; |
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69 |
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70 TInt LongNameLen = aLongName.Length(); |
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71 TInt extDelimiterIndex = aLongName.LocateReverse(KExtDelimiter); |
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72 |
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73 for (TInt i=LongNameLen-1; i>=0; --i) // iterate backwards as aLongName may change length during the loop, and also because we want to leave the *right-most* occurrence of KExtDelimiter unchanged |
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74 { |
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75 TUint character=aLongName[i]; |
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76 if (character==(TUint)KExtDelimiter) |
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77 { |
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78 if (alreadyFoundExtensionDelimiter) |
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79 { |
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80 aLongName[i]=(TText)aCharacterToReplaceWith; // A.B.C becomes A_B.C |
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81 } |
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82 alreadyFoundExtensionDelimiter=ETrue; |
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83 } |
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84 else |
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85 { |
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86 // the code below doesn't need any #if defined(_UNICODE) stuff as a narrow-build aLongName would not contain values above 0xff (which is well below the surrogates area in Unicode 0xd800-0xdfff) |
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87 TBool isSurrogatePair=EFalse; |
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88 |
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89 // LAST character in file name or file ext CAN NOT be HIGH surrogate |
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90 if (i==LongNameLen-1 || i==extDelimiterIndex-1) |
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91 { |
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92 if (IsHighSurrogate((TText16)character)) |
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93 { |
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94 // Corrupt surrogate |
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95 User::Leave(KErrBadName); |
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96 } |
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97 } |
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98 // FIRST character in file name or file ext CAN NOT be LOW surrogate |
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99 if (i==0 || i==extDelimiterIndex+1) |
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100 { |
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101 if (IsLowSurrogate((TText16)character)) |
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102 { |
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103 // Corrupt surrogate |
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104 User::Leave(KErrBadName); |
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105 } |
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106 } |
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107 // if LOW Surrogate |
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108 if (IsLowSurrogate((TText16)character)) |
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109 { |
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110 // check for HIGH surrogate |
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111 if (!IsHighSurrogate(aLongName[--i])) |
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112 { |
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113 // Corrupt surrogate |
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114 User::Leave(KErrBadName); |
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115 } |
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116 // surrogate pair found |
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117 character&=~0xdc00; |
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118 character|=((aLongName[i]&~0xd800)<<10); |
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119 character+=0x00010000; // this must be added - it cannot be bitwise-"or"-ed |
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120 isSurrogatePair=ETrue; |
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121 } |
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122 |
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123 // if High Surrogate |
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124 if (!isSurrogatePair && IsHighSurrogate((TText16)character)) |
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125 { |
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126 // Corrupt surrogate |
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127 User::Leave(KErrBadName); |
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128 } |
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129 |
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130 if (!IsLegalChar(character, EFalse)) |
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131 { |
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132 if (isSurrogatePair) |
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133 { |
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134 aLongName.Delete(i+1, 1); |
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135 } |
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136 aLongName[i]=(TText)aCharacterToReplaceWith; |
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137 } |
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138 } |
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139 } |
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140 } |
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141 |
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142 TShortName DoGenerateShortNameL(const TDesC& aLongName,TInt& aNum,TBool aUseTildeSelectively) |
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143 // |
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144 // Create a legal shortname from aLongName |
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145 // |
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146 { |
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147 |
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148 TFileName longName(aLongName); |
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149 longName.UpperCase(); |
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150 ReplaceIllegalCharactersL(longName, '_'); |
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151 TPtrC longNameWithoutExtension(longName); |
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152 TPtrC longNameExtension(KNullDesC); |
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153 const TInt positionOfExtension=longName.LocateReverse(KExtDelimiter); |
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154 if (positionOfExtension==0) |
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155 { |
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156 // No filename specified, so use the extension as the basis of the shortname. |
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157 // Make sure we always append a tilde+number in this case to avoid generating the same |
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158 // short filename as one of the protected folders ("\SYS", "\RESOURCE","\PRIVATE") |
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159 longNameWithoutExtension.Set(longName.Mid(positionOfExtension+1)); |
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160 aUseTildeSelectively = EFalse; |
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161 if (aNum < 0) |
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162 aNum = 1; |
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163 } |
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164 else if (positionOfExtension!=KErrNotFound) |
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165 { |
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166 longNameWithoutExtension.Set(longName.Left(positionOfExtension)); |
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167 longNameExtension.Set(longName.Mid(positionOfExtension+1)); |
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168 } |
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169 |
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170 // Converts the original file name main part into 8-bit character string |
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171 TShortName tempShortName(0); |
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172 |
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173 LocaleUtils::ConvertFromUnicodeL(tempShortName, longNameWithoutExtension); |
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174 const TInt originalNameLength = tempShortName.Length(); |
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175 |
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176 // Converts the original file name extension part into 8-bit character string |
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177 TShortName tempShortNameExt(0); |
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178 |
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179 LocaleUtils::ConvertFromUnicodeL(tempShortNameExt, longNameExtension); |
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180 const TInt extensionNameLength = tempShortNameExt.Length(); |
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181 // // const TInt extensionNameLength = tempShortNameExt.Length(); |
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182 |
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183 // Checks the length of both original file name main part and original file name extension part |
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184 if(aUseTildeSelectively) |
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185 { |
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186 // don't append ~<aNum> |
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187 if(originalNameLength<=KMaxLengthWithoutTilde && extensionNameLength<=KMaxFatFileNameExt) |
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188 aNum=-1; |
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189 } |
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190 |
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191 // Applies tilde and number if necessary |
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192 TBuf8<5> tildeAndNumber; |
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193 if (aNum>=0) |
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194 { |
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195 tildeAndNumber.Append('~'); |
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196 tildeAndNumber.AppendNumUC(aNum,EHex); |
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197 } |
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198 const TInt lengthOfTildeAndNumber=tildeAndNumber.Length(); |
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199 |
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200 // Creates actual shortname from longname of the original file |
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201 TShortName shortName(11); |
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202 #if defined(_DEBUG) |
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203 shortName.Fill(0x01); // fill shortName with garbage to ensure that every byte is written to by this function |
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204 #endif |
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205 |
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206 // Fills the main part of the shortname of the original file |
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207 const TInt numberOfBytesFreeBeforeTilde=KMaxFatFileNameWithoutExt-lengthOfTildeAndNumber; |
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208 |
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209 TPtr8 portionOfShortNameBeforeTilde((TUint8*)shortName.Ptr(), 0, numberOfBytesFreeBeforeTilde); |
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210 TInt lengthOfPortionOfShortNameBeforeTilde = |
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211 (originalNameLength < numberOfBytesFreeBeforeTilde) ? originalNameLength : numberOfBytesFreeBeforeTilde; |
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212 |
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213 portionOfShortNameBeforeTilde.Copy((TUint8*)tempShortName.Ptr(), lengthOfPortionOfShortNameBeforeTilde); |
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214 if( lengthOfPortionOfShortNameBeforeTilde != originalNameLength) |
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215 { |
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216 for( int i = 0; i<lengthOfPortionOfShortNameBeforeTilde; i++) |
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217 { |
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218 if(portionOfShortNameBeforeTilde[i] >= 0x80) //leading byte found |
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219 { |
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220 if( i == lengthOfPortionOfShortNameBeforeTilde - 1) //leading byte found on the edge |
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221 { |
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222 lengthOfPortionOfShortNameBeforeTilde -= 1; |
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223 break; |
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224 } |
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225 else |
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226 { |
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227 i++; |
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228 } |
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229 } |
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230 } |
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231 } |
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232 Mem::Copy(((TUint8*)shortName.Ptr())+lengthOfPortionOfShortNameBeforeTilde, tildeAndNumber.Ptr(), lengthOfTildeAndNumber); |
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233 TInt i; |
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234 for (i=lengthOfPortionOfShortNameBeforeTilde+lengthOfTildeAndNumber; i<KMaxFatFileNameWithoutExt; ++i) |
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235 { |
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236 shortName[i]=' '; |
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237 } |
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238 |
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239 // Fills the extension part of the shortname of the original file |
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240 TInt lengthOfExt = |
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241 (extensionNameLength < KMaxFatFileNameExt) ? extensionNameLength : KMaxFatFileNameExt; |
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242 |
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243 if( lengthOfExt != extensionNameLength) |
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244 { |
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245 for( int i = 0; i<lengthOfExt; i++) |
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246 { |
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247 if(tempShortNameExt[i] >= 0x80) |
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248 { |
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249 if( i == lengthOfExt - 1) |
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250 { |
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251 lengthOfExt -= 1; |
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252 break; |
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253 } |
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254 else |
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255 { |
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256 i++; |
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257 } |
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258 } |
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259 } |
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260 } |
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261 Mem::Copy(((TUint8*)shortName.Ptr()) + KMaxFatFileNameWithoutExt, tempShortNameExt.Ptr(), lengthOfExt); |
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262 for (i = KMaxFatFileNameWithoutExt + lengthOfExt; i<KMaxFatFileNameWithoutExt+KMaxFatFileNameExt; ++i) |
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263 { |
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264 shortName[i]=' '; |
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265 } |
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266 |
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267 ReplaceFirstCharacterIfClashesWithE5L(shortName); |
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268 return shortName; |
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269 } |
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270 |
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271 |
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272 /** |
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273 Check whether a Dos name is legal or not. |
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274 |
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275 @param aName The entry name to be analysed (may be represented as TDes16& or TDes8&) |
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276 @param anAllowWildCards Flag to indicate whether to allow wildcards in name or not |
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277 @param aUseExtendedChars Flag to indicate if extended characters are allowed |
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278 @param aInScanDrive Flag to indicate whether called when scanning drive |
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279 @param aAllowLowerCase ETrue to allow lower case in the analysed DOS name |
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280 |
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281 @return ETrue if the name is a legal DOS one. |
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282 */ |
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283 |
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284 static TBool DoCheckLegalDosName(const TDesC& aName, TBool anAllowWildCards, TBool aUseExtendedChars, TBool aInScanDrive, TBool aAllowLowerCase, TBool aIsForFileCreation) |
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285 { |
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286 const TInt count=aName.Length(); |
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287 if (count==0) |
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288 return EFalse; |
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289 |
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290 TInt valid=0; |
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291 TInt i=0; |
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292 |
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293 //-- check the entry name |
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294 while (i<count) |
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295 { |
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296 TChar c=aName[i++]; |
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297 if (c==KExtDelimiter) |
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298 { |
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299 // DOS entry names must contain at least one valid character before the extension |
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300 if (i == 1) |
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301 return EFalse; |
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302 break; |
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303 } |
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304 |
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305 if(!aAllowLowerCase && c.IsLower()) |
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306 return EFalse; //-- low case is not allowed |
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307 |
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308 if (!IsLegalChar(c,anAllowWildCards,aUseExtendedChars,aInScanDrive)) |
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309 { |
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310 return EFalse; |
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311 } |
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312 |
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313 if (aIsForFileCreation) |
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314 { |
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315 if ((aUseExtendedChars && (TUint) c > KExtendedCharEnd) || |
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316 (!aUseExtendedChars && (TUint) c > KExtendedCharStart)) |
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317 { |
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318 return EFalse; |
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319 } |
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320 } |
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321 |
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322 if (c!=KMatchAny) |
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323 if (++valid>KMaxFatFileNameWithoutExt) |
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324 return EFalse; |
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325 } |
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326 |
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327 //-- check entry extension |
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328 valid=0; |
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329 while (i<count) |
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330 { |
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331 TChar c=aName[i++]; |
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332 if (c==KExtDelimiter) |
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333 return EFalse; |
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334 |
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335 if(!aAllowLowerCase && c.IsLower()) |
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336 return EFalse; //-- low case is not allowed |
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337 |
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338 if (!IsLegalChar(c,anAllowWildCards,aUseExtendedChars,aInScanDrive)) |
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339 return EFalse; |
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340 |
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341 if (aIsForFileCreation) |
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342 { |
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343 if ((aUseExtendedChars && (TUint) c > KExtendedCharEnd) || |
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344 (!aUseExtendedChars && (TUint) c > KExtendedCharStart)) |
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345 { |
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346 return EFalse; |
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347 } |
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348 } |
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349 |
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350 if (c!=KMatchAny) |
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351 if (++valid>KMaxFatFileNameExt) |
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352 return EFalse; |
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353 } |
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354 |
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355 // Unicode file name checking for file opening. |
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356 if (!aIsForFileCreation && GetFatUtilityFunctions()) |
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357 { |
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358 TBuf8<KMaxFileName*2> convertedName8; |
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359 TRAPD(err, LocaleUtils::ConvertFromUnicodeL(convertedName8, aName, TFatUtilityFunctions::EOverflowActionLeave)); |
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360 if (err != KErrNone) |
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361 return EFalse; |
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362 |
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363 const TInt len8 = convertedName8.Length(); |
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364 TInt j = 0; |
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365 TInt nonWildChar = 0; |
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366 while (j < len8) |
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367 { |
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368 const TUint8 c8 = convertedName8[j++]; |
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369 if (c8 == KExtDelimiter) |
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370 break; |
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371 if (c8 == '*' && !anAllowWildCards) |
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372 return EFalse; |
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373 if (c8 == '*' && anAllowWildCards) |
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374 continue; |
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375 |
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376 if (++nonWildChar > KMaxFatFileNameWithoutExt) |
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377 return EFalse; |
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378 } |
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379 |
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380 // check extension part |
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381 nonWildChar = 0; |
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382 while (j < len8) |
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383 { |
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384 const TUint8 c8 = convertedName8[j++]; |
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385 if (c8 == KExtDelimiter) |
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386 return EFalse; |
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387 if (c8 == '*' && !anAllowWildCards) |
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388 return EFalse; |
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389 if (c8 == '*' && anAllowWildCards) |
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390 continue; |
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391 |
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392 if (++nonWildChar > KMaxFatFileNameExt) |
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393 return EFalse; |
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394 } |
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395 } |
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396 |
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397 return ETrue; |
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398 } |
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399 |
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400 /** |
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401 Check whether a Dos name is legal or not. Unicode version |
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402 parameters and return value absolutely the same as in DoCheckLegalDosName() |
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403 */ |
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404 TBool IsLegalDosName(const TDesC16& aName, TBool anAllowWildCards, TBool aUseExtendedChars, TBool aInScanDrive, TBool aAllowLowerCase, TBool aIsForFileCreation) |
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405 { |
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406 |
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407 __PRINT(_L("IsLegalDosName 16")); |
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408 |
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409 return DoCheckLegalDosName(aName, anAllowWildCards, aUseExtendedChars, aInScanDrive, aAllowLowerCase, aIsForFileCreation); |
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410 } |
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411 |
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412 TBool CFatMountCB::FindShortNameL(const TShortName& aName,TEntryPos& anEntryPos) |
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413 // |
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414 // Returns ETrue and the entryPos of aName if found or EFalse |
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415 // |
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416 { |
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417 |
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418 __PRINT(_L("VFAT::CFatMountCB::FindShortNameL")); |
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419 TFatDirEntry fatEntry; |
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420 TInt count=0; |
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421 FOREVER |
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422 { |
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423 count++; |
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424 ReadDirEntryL(anEntryPos,fatEntry); |
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425 MoveToDosEntryL(anEntryPos,fatEntry); |
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426 if (fatEntry.IsEndOfDirectory()) |
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427 break; |
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428 if (IsRootDir(anEntryPos)&&(anEntryPos.iPos+StartOfRootDirInBytes()==(RootDirEnd()-KSizeOfFatDirEntry))) |
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429 if (fatEntry.IsErased()) |
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430 break;//Allows maximum number of entries in root directory |
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431 if (fatEntry.Name()==aName) |
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432 return ETrue; |
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433 MoveToNextEntryL(anEntryPos); |
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434 if (IsRootDir(anEntryPos)&&(StartOfRootDirInBytes()+anEntryPos.iPos==RootDirEnd())) |
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435 break;//Allows maximum number of entries in root directory |
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436 } |
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437 return EFalse; |
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438 } |
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439 |
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440 TBool CFatMountCB::IsUniqueNameL(const TShortName& aName,TInt aDirCluster) |
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441 // |
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442 // Returns ETrue if aName is unique, EFalse if a matching name is found. |
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443 // |
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444 { |
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445 |
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446 __PRINT(_L("VFAT::CFatMountCB::IsUniqueNameL")); |
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447 TEntryPos entryPos(aDirCluster,0); |
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448 if (FindShortNameL(aName,entryPos)) |
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449 return(EFalse); |
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450 return(ETrue); |
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451 } |
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452 |
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453 void CFatMountCB::ReplaceClashingNameL(const TShortName& aNewName,const TEntryPos& anEntryPos) |
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454 // |
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455 // A legal dos name has been typed that clashes with a computer generated shortname |
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456 // Change the shortname to something else. |
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457 // |
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458 { |
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459 |
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460 __PRINT(_L("VFAT::CFatMountCB::ReplaceClashingNameL")); |
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461 TFatDirEntry entry; |
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462 ReadDirEntryL(anEntryPos,entry); |
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463 __ASSERT_ALWAYS(entry.IsEndOfDirectory()==EFalse,User::Leave(KErrCorrupt)); |
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464 entry.SetName(aNewName); |
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465 WriteDirEntryL(anEntryPos,entry); |
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466 // We now need to fix up VFAT entries with a new checksum reflecting new shortname |
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467 // Calculate new checksum |
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468 TUint8 checksum=CalculateShortNameCheckSum(aNewName); |
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469 // Now go back and adjust all VFAT entries corresponding to this shortname |
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470 TEntryPos entryPos=anEntryPos; |
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471 FOREVER |
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472 { |
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473 entryPos.iPos-=KSizeOfFatDirEntry; |
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474 ReadDirEntryL(entryPos,entry); |
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475 entry.iData[0x0D]=checksum; |
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476 if (entry.iData[0]&0x40) |
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477 break; |
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478 } |
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479 } |
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480 |
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481 TBool CFatMountCB::GenerateShortNameL(TInt aDirCluster,const TDesC& aName,TShortName& aGeneratedName, TBool aForceRandomize) |
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482 // |
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483 // Generate a legal dos filename as an alias for aName. |
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484 // Returns ETrue if aName is a legal dos name. |
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485 // |
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486 { |
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487 |
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488 __PRINT(_L("VFAT::CFatMountCB::GenerateShortNameL")); |
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489 // Given the long file-name "ABCDEFGHI.TXT", EPOC used to generate short |
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490 // file-names in the following pecking order: |
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491 // "ABCDEFGH.TXT", |
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492 // "ABCDEF~0.TXT", |
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493 // "ABCDEF~1.TXT", |
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494 // "ABCDEF~2.TXT", |
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495 // etc. |
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496 // Now, however, EPOC behaves in a more Windows-like manner and |
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497 // generates short file-names in this pecking order: |
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498 // "ABCDEF~1.TXT", |
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499 // "ABCDEF~2.TXT", |
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500 // "ABCDEF~3.TXT", |
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501 // "ABCDEF~4.TXT", |
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502 // After failing to find an unused short name 4 times in a row, |
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503 // a random number is used to speed up the process. So subsequent |
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504 // short-file names become |
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505 // "ABC~nnnn.TXT" where nnnn is a random number |
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506 // |
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507 TBool useTildeSelectively = ETrue; |
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508 TInt endNum = KMaxDuplicateShortName; // 0xFFFF |
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509 const TInt KMaxNonRandomShortFileNames = 4; |
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510 |
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511 TInt i = 1; |
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512 |
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513 TBool randomize = aForceRandomize; |
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514 if (randomize) |
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515 { |
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516 i = (TInt) (Math::Random() & KMaxDuplicateShortName); |
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517 endNum = (i - 1) & KMaxDuplicateShortName; |
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518 } |
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519 |
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520 while(i != endNum) |
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521 { |
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522 aGeneratedName=DoGenerateShortNameL(aName,i,useTildeSelectively); |
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523 |
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524 if (IsUniqueNameL(aGeneratedName,aDirCluster)) |
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525 break; |
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526 |
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527 if (i == KMaxNonRandomShortFileNames && !randomize) |
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528 { |
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529 randomize = ETrue; |
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530 i = (TInt) (Math::Random() & KMaxDuplicateShortName); |
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531 endNum = (i - 1) & KMaxDuplicateShortName; |
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532 } |
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533 else if (i == -1) |
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534 { |
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535 useTildeSelectively=EFalse; |
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536 i = 1; |
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537 } |
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538 else |
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539 i = (i + 1) & KMaxDuplicateShortName; |
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540 } |
|
541 |
|
542 if (i == endNum) |
|
543 User::Leave(KErrAlreadyExists); |
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544 |
|
545 if((i == -1) && IsLegalDosName(aName,EFalse,EFalse,EFalse,EFalse,ETrue)) |
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546 { |
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547 // Original file name is a legal 8.3 name |
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548 return(ETrue); |
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549 } |
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550 else |
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551 { |
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552 return(EFalse); |
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553 } |
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554 |
|
555 |
|
556 } |
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557 |
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558 void TFatDirEntry::InitializeAsVFat(TUint8 aCheckSum) |
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559 // |
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560 // Initialize a FAT entry as a VFAT filename |
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561 // |
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562 { |
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563 |
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564 Mem::Fill(this,sizeof(SFatDirEntry),0xFF); |
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565 iData[0x0B]=0x0F; |
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566 iData[0x0C]=0x00; iData[0x0D]=aCheckSum; |
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567 iData[0x1A]=0x00; iData[0x1B]=0x00; |
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568 } |
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569 |
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570 void TFatDirEntry::SetVFatEntry(const TDesC& aName,TInt aLen) |
|
571 // |
|
572 // Write up to KMaxVFatEntryName unicode chars from aName to the entry |
|
573 // |
|
574 { |
|
575 |
|
576 TInt rem=aName.Length()-aLen; |
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577 TPtrC section(aName.Ptr()+aLen,Min(rem,KMaxVFatEntryName)); |
|
578 TBuf16<KMaxVFatEntryName> buf16; |
|
579 buf16.Copy(section); |
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580 if (rem<KMaxVFatEntryName) |
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581 { |
|
582 rem++; |
|
583 buf16.ZeroTerminate(); |
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584 buf16.SetLength(rem); // Zero termination doesn't increase the buf length |
|
585 } |
|
586 TUint8 orderNo=(TUint8)(aLen/KMaxVFatEntryName+1); |
|
587 TInt s=Min(rem,5); |
|
588 Mem::Copy(&iData[0x01],buf16.Ptr(),s*2);//Copy up to 10 bytes of buf16 into iData |
|
589 TInt offset=s; |
|
590 rem-=s; |
|
591 s=Min(rem,6); |
|
592 Mem::Copy(&iData[0x0E],buf16.Ptr()+offset,s*2); |
|
593 offset+=s; |
|
594 rem-=s; |
|
595 s=Min(rem,2); |
|
596 Mem::Copy(&iData[0x1C],buf16.Ptr()+offset,s*2); |
|
597 rem-=s; |
|
598 if (rem==0) |
|
599 orderNo|=0x40; |
|
600 iData[0]=orderNo; |
|
601 } |
|
602 |
|
603 void TFatDirEntry::ReadVFatEntry(TDes16& aBuf) const |
|
604 // |
|
605 // Read KMaxVFatEntryName unicode chars from the entry |
|
606 // |
|
607 { |
|
608 |
|
609 aBuf.SetLength(KMaxVFatEntryName); |
|
610 Mem::Copy(&aBuf[0],&iData[0x01],5*2); |
|
611 Mem::Copy(&aBuf[5],&iData[0x0E],6*2); |
|
612 Mem::Copy(&aBuf[11],&iData[0x1C],2*2); |
|
613 } |
|
614 |
|
615 void CFatMountCB::WriteDirEntryL(TEntryPos& aPos,const TFatDirEntry& aFatDirEntry,const TDesC& aLongName) |
|
616 // |
|
617 // Write a VFAT directory entry to disk at position aPos - leave aPos refering to the dos entry |
|
618 // Assumes sufficient space has been created for it by AddDirEntry. |
|
619 // |
|
620 { |
|
621 |
|
622 __PRINT(_L("VFAT::CFatMountCB::WriteDirEntryL")); |
|
623 __ASSERT_DEBUG(aLongName.Length(),Fault(EVFatNoLongName)); |
|
624 TEntryPos startPos(aPos.iCluster,aPos.iPos); |
|
625 TUint8 localBuf[KDefaultSectorSize]; |
|
626 TUint8 cksum=CalculateShortNameCheckSum(aFatDirEntry.Name()); |
|
627 TInt numEntries=NumberOfVFatEntries(aLongName.Length())-1; // Excluding dos entry |
|
628 // see if all entries written to one sector |
|
629 // single sector writes not supported if sector size>default size |
|
630 TInt dosOffset=numEntries<<KSizeOfFatDirEntryLog2; |
|
631 TInt absolutePos=(aPos.iCluster<<ClusterSizeLog2())+ClusterRelativePos(aPos.iPos); |
|
632 TBool isSameSector=(((absolutePos^(absolutePos+dosOffset))>>SectorSizeLog2())==0 && ((TUint)(1<<SectorSizeLog2())<=KDefaultSectorSize)); |
|
633 TFatDirEntry vFatEntry; |
|
634 vFatEntry.InitializeAsVFat(cksum); |
|
635 TInt offset=0; |
|
636 while (numEntries--) |
|
637 { |
|
638 vFatEntry.SetVFatEntry(aLongName,KMaxVFatEntryName*numEntries);// KMaxVFatEntryName=13 |
|
639 if(isSameSector) |
|
640 { |
|
641 Mem::Copy(&localBuf[offset],&vFatEntry,KSizeOfFatDirEntry); |
|
642 offset+=KSizeOfFatDirEntry; |
|
643 MoveToNextEntryL(aPos); |
|
644 } |
|
645 else |
|
646 { |
|
647 WriteDirEntryL(aPos,vFatEntry); |
|
648 MoveToNextEntryL(aPos); |
|
649 } |
|
650 } |
|
651 if(isSameSector) |
|
652 { |
|
653 Mem::Copy(&localBuf[offset],&aFatDirEntry,KSizeOfFatDirEntry); |
|
654 |
|
655 //-- use special interface to access FAT directory file |
|
656 DirWriteL(startPos,TPtrC8(&localBuf[0],dosOffset+KSizeOfFatDirEntry)); |
|
657 } |
|
658 else |
|
659 WriteDirEntryL(aPos,aFatDirEntry); |
|
660 } |
|
661 |
|
662 void CFatMountCB::EraseDirEntryL(TEntryPos aPos,const TFatDirEntry& aFirstEntry) |
|
663 // |
|
664 // Mark all entries in a VFat directory entry as erased |
|
665 // |
|
666 { |
|
667 __PRINT(_L("VFAT::CFatMountCB::EraseDirEntryL")); |
|
668 TInt numEntries=0; |
|
669 if (aFirstEntry.IsVFatEntry()) |
|
670 numEntries=aFirstEntry.NumFollowing(); |
|
671 if(IsRuggedFSys()&&numEntries) |
|
672 { |
|
673 TInt count=numEntries; |
|
674 TEntryPos pos=aPos; |
|
675 while(count--) |
|
676 MoveToNextEntryL(pos); |
|
677 EraseDirEntryL(pos); |
|
678 numEntries--; |
|
679 } |
|
680 FOREVER |
|
681 { |
|
682 EraseDirEntryL(aPos); |
|
683 if (!numEntries--) |
|
684 break; |
|
685 MoveToNextEntryL(aPos); |
|
686 } |
|
687 } |
|
688 |
|
689 |
|
690 void LocaleUtils::ConvertFromUnicodeL(TDes8& aForeign, const TDesC16& aUnicode, TFatUtilityFunctions::TOverflowAction aOverflowAction) |
|
691 // |
|
692 // Convert the volume label using the algorithm specified in the current locale-DLL. |
|
693 // |
|
694 { |
|
695 if(aOverflowAction == TFatUtilityFunctions::EOverflowActionLeave) |
|
696 { |
|
697 GetCodePage().ConvertFromUnicodeL(aForeign, aUnicode, TCodePageUtils::EOverflowActionLeave); |
|
698 } |
|
699 else |
|
700 { |
|
701 GetCodePage().ConvertFromUnicodeL(aForeign, aUnicode, TCodePageUtils::EOverflowActionTruncate); |
|
702 } |
|
703 } |
|
704 |
|
705 void LocaleUtils::ConvertToUnicodeL(TDes16& aUnicode, const TDesC8& aForeign, TFatUtilityFunctions::TOverflowAction aOverflowAction) |
|
706 // |
|
707 // Convert the volume label using the algorithm specified in the current locale-DLL. |
|
708 // |
|
709 { |
|
710 if(aOverflowAction == TFatUtilityFunctions::EOverflowActionLeave) |
|
711 { |
|
712 GetCodePage().ConvertToUnicodeL(aUnicode, aForeign, TCodePageUtils::EOverflowActionLeave); |
|
713 } |
|
714 else |
|
715 { |
|
716 GetCodePage().ConvertToUnicodeL(aUnicode, aForeign, TCodePageUtils::EOverflowActionTruncate); |
|
717 } |
|
718 } |
|
719 |
|
720 TBool LocaleUtils::IsLegalShortNameCharacter(TUint aCharacter,TBool aUseExtendedChars) |
|
721 // |
|
722 // Convert the volume label using the algorithm specified in the current locale-DLL. |
|
723 // |
|
724 { |
|
725 return GetCodePage().IsLegalShortNameCharacter(aCharacter, aUseExtendedChars); |
|
726 } |