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