--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/userlibandfileserver/fileserver/sfat/sl_vfat.cpp Thu Dec 17 09:24:54 2009 +0200
@@ -0,0 +1,726 @@
+// Copyright (c) 1996-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// f32\sfat\sl_vfat.cpp
+//
+//
+
+//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+//!!
+//!! WARNING!! DO NOT edit this file !! '\sfat' component is obsolete and is not being used. '\sfat32'replaces it
+//!!
+//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+
+#include "sl_std.h"
+#include "sl_cache.h"
+#include <e32svr.h>
+#include <e32math.h>
+
+
+IMPORT_C const TFatUtilityFunctions* GetFatUtilityFunctions();
+
+const TInt KMaxLengthWithoutTilde = 8;
+const TUint8 KLeadingE5Replacement = 0x05;
+
+// use second half of ISO Latin 1 character set for extended chars
+const TUint KExtendedCharStart=0x80;
+const TUint KExtendedCharEnd=0xff;
+
+LOCAL_C TBool IsLegalChar(TChar aCharacter,TBool aAllowWildChars,TBool aUseExtendedChars=EFalse,TBool aInScanDrive=EFalse)
+//
+// Returns ETrue if aCharacter is legal inside a dos filename
+//
+ {
+ if ((aCharacter==KMatchOne) || (aCharacter==KMatchAny))
+ return(aAllowWildChars);
+ if ((TUint)aCharacter < 0x20)
+ return EFalse;
+ // Don't check illegal ascii char because some non-English char value may
+ // fall in this area
+ if (aInScanDrive)
+ return ETrue;
+ return LocaleUtils::IsLegalShortNameCharacter(aCharacter,aUseExtendedChars);
+ }
+
+LOCAL_C void ReplaceFirstCharacterIfClashesWithE5L(TDes8& aShortName)
+ {
+ if (0 < aShortName.Length() && aShortName[0] == KEntryErasedMarker)
+ {
+ aShortName[0] = KLeadingE5Replacement;
+ }
+ }
+
+LOCAL_C void ReplaceIllegalCharactersL(TDes& aLongName, TUint aCharacterToReplaceWith)
+ {
+ TBool alreadyFoundExtensionDelimiter=EFalse;
+
+ TInt LongNameLen = aLongName.Length();
+ TInt extDelimiterIndex = aLongName.LocateReverse(KExtDelimiter);
+
+ 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
+ {
+ TUint character=aLongName[i];
+ if (character==(TUint)KExtDelimiter)
+ {
+ if (alreadyFoundExtensionDelimiter)
+ {
+ aLongName[i]=(TText)aCharacterToReplaceWith; // A.B.C becomes A_B.C
+ }
+ alreadyFoundExtensionDelimiter=ETrue;
+ }
+ else
+ {
+ // 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)
+ TBool isSurrogatePair=EFalse;
+
+ // LAST character in file name or file ext CAN NOT be HIGH surrogate
+ if (i==LongNameLen-1 || i==extDelimiterIndex-1)
+ {
+ if (IsHighSurrogate((TText16)character))
+ {
+ // Corrupt surrogate
+ User::Leave(KErrBadName);
+ }
+ }
+ // FIRST character in file name or file ext CAN NOT be LOW surrogate
+ if (i==0 || i==extDelimiterIndex+1)
+ {
+ if (IsLowSurrogate((TText16)character))
+ {
+ // Corrupt surrogate
+ User::Leave(KErrBadName);
+ }
+ }
+ // if LOW Surrogate
+ if (IsLowSurrogate((TText16)character))
+ {
+ // check for HIGH surrogate
+ if (!IsHighSurrogate(aLongName[--i]))
+ {
+ // Corrupt surrogate
+ User::Leave(KErrBadName);
+ }
+ // surrogate pair found
+ character&=~0xdc00;
+ character|=((aLongName[i]&~0xd800)<<10);
+ character+=0x00010000; // this must be added - it cannot be bitwise-"or"-ed
+ isSurrogatePair=ETrue;
+ }
+
+ // if High Surrogate
+ if (!isSurrogatePair && IsHighSurrogate((TText16)character))
+ {
+ // Corrupt surrogate
+ User::Leave(KErrBadName);
+ }
+
+ if (!IsLegalChar(character, EFalse))
+ {
+ if (isSurrogatePair)
+ {
+ aLongName.Delete(i+1, 1);
+ }
+ aLongName[i]=(TText)aCharacterToReplaceWith;
+ }
+ }
+ }
+ }
+
+TShortName DoGenerateShortNameL(const TDesC& aLongName,TInt& aNum,TBool aUseTildeSelectively)
+//
+// Create a legal shortname from aLongName
+//
+ {
+
+ TFileName longName(aLongName);
+ longName.UpperCase();
+ ReplaceIllegalCharactersL(longName, '_');
+ TPtrC longNameWithoutExtension(longName);
+ TPtrC longNameExtension(KNullDesC);
+ const TInt positionOfExtension=longName.LocateReverse(KExtDelimiter);
+ if (positionOfExtension==0)
+ {
+ // No filename specified, so use the extension as the basis of the shortname.
+ // Make sure we always append a tilde+number in this case to avoid generating the same
+ // short filename as one of the protected folders ("\SYS", "\RESOURCE","\PRIVATE")
+ longNameWithoutExtension.Set(longName.Mid(positionOfExtension+1));
+ aUseTildeSelectively = EFalse;
+ if (aNum < 0)
+ aNum = 1;
+ }
+ else if (positionOfExtension!=KErrNotFound)
+ {
+ longNameWithoutExtension.Set(longName.Left(positionOfExtension));
+ longNameExtension.Set(longName.Mid(positionOfExtension+1));
+ }
+
+ // Converts the original file name main part into 8-bit character string
+ TShortName tempShortName(0);
+
+ LocaleUtils::ConvertFromUnicodeL(tempShortName, longNameWithoutExtension);
+ const TInt originalNameLength = tempShortName.Length();
+
+ // Converts the original file name extension part into 8-bit character string
+ TShortName tempShortNameExt(0);
+
+ LocaleUtils::ConvertFromUnicodeL(tempShortNameExt, longNameExtension);
+ const TInt extensionNameLength = tempShortNameExt.Length();
+ // // const TInt extensionNameLength = tempShortNameExt.Length();
+
+ // Checks the length of both original file name main part and original file name extension part
+ if(aUseTildeSelectively)
+ {
+ // don't append ~<aNum>
+ if(originalNameLength<=KMaxLengthWithoutTilde && extensionNameLength<=KMaxFatFileNameExt)
+ aNum=-1;
+ }
+
+ // Applies tilde and number if necessary
+ TBuf8<5> tildeAndNumber;
+ if (aNum>=0)
+ {
+ tildeAndNumber.Append('~');
+ tildeAndNumber.AppendNumUC(aNum,EHex);
+ }
+ const TInt lengthOfTildeAndNumber=tildeAndNumber.Length();
+
+ // Creates actual shortname from longname of the original file
+ TShortName shortName(11);
+#if defined(_DEBUG)
+ shortName.Fill(0x01); // fill shortName with garbage to ensure that every byte is written to by this function
+#endif
+
+ // Fills the main part of the shortname of the original file
+ const TInt numberOfBytesFreeBeforeTilde=KMaxFatFileNameWithoutExt-lengthOfTildeAndNumber;
+
+ TPtr8 portionOfShortNameBeforeTilde((TUint8*)shortName.Ptr(), 0, numberOfBytesFreeBeforeTilde);
+ TInt lengthOfPortionOfShortNameBeforeTilde =
+ (originalNameLength < numberOfBytesFreeBeforeTilde) ? originalNameLength : numberOfBytesFreeBeforeTilde;
+
+ portionOfShortNameBeforeTilde.Copy((TUint8*)tempShortName.Ptr(), lengthOfPortionOfShortNameBeforeTilde);
+ if( lengthOfPortionOfShortNameBeforeTilde != originalNameLength)
+ {
+ for( int i = 0; i<lengthOfPortionOfShortNameBeforeTilde; i++)
+ {
+ if(portionOfShortNameBeforeTilde[i] >= 0x80) //leading byte found
+ {
+ if( i == lengthOfPortionOfShortNameBeforeTilde - 1) //leading byte found on the edge
+ {
+ lengthOfPortionOfShortNameBeforeTilde -= 1;
+ break;
+ }
+ else
+ {
+ i++;
+ }
+ }
+ }
+ }
+ Mem::Copy(((TUint8*)shortName.Ptr())+lengthOfPortionOfShortNameBeforeTilde, tildeAndNumber.Ptr(), lengthOfTildeAndNumber);
+ TInt i;
+ for (i=lengthOfPortionOfShortNameBeforeTilde+lengthOfTildeAndNumber; i<KMaxFatFileNameWithoutExt; ++i)
+ {
+ shortName[i]=' ';
+ }
+
+ // Fills the extension part of the shortname of the original file
+ TInt lengthOfExt =
+ (extensionNameLength < KMaxFatFileNameExt) ? extensionNameLength : KMaxFatFileNameExt;
+
+ if( lengthOfExt != extensionNameLength)
+ {
+ for( int i = 0; i<lengthOfExt; i++)
+ {
+ if(tempShortNameExt[i] >= 0x80)
+ {
+ if( i == lengthOfExt - 1)
+ {
+ lengthOfExt -= 1;
+ break;
+ }
+ else
+ {
+ i++;
+ }
+ }
+ }
+ }
+ Mem::Copy(((TUint8*)shortName.Ptr()) + KMaxFatFileNameWithoutExt, tempShortNameExt.Ptr(), lengthOfExt);
+ for (i = KMaxFatFileNameWithoutExt + lengthOfExt; i<KMaxFatFileNameWithoutExt+KMaxFatFileNameExt; ++i)
+ {
+ shortName[i]=' ';
+ }
+
+ ReplaceFirstCharacterIfClashesWithE5L(shortName);
+ return shortName;
+ }
+
+
+/**
+Check whether a Dos name is legal or not.
+
+@param aName The entry name to be analysed (may be represented as TDes16& or TDes8&)
+@param anAllowWildCards Flag to indicate whether to allow wildcards in name or not
+@param aUseExtendedChars Flag to indicate if extended characters are allowed
+@param aInScanDrive Flag to indicate whether called when scanning drive
+@param aAllowLowerCase ETrue to allow lower case in the analysed DOS name
+
+@return ETrue if the name is a legal DOS one.
+*/
+
+static TBool DoCheckLegalDosName(const TDesC& aName, TBool anAllowWildCards, TBool aUseExtendedChars, TBool aInScanDrive, TBool aAllowLowerCase, TBool aIsForFileCreation)
+ {
+ const TInt count=aName.Length();
+ if (count==0)
+ return EFalse;
+
+ TInt valid=0;
+ TInt i=0;
+
+ //-- check the entry name
+ while (i<count)
+ {
+ TChar c=aName[i++];
+ if (c==KExtDelimiter)
+ {
+ // DOS entry names must contain at least one valid character before the extension
+ if (i == 1)
+ return EFalse;
+ break;
+ }
+
+ if(!aAllowLowerCase && c.IsLower())
+ return EFalse; //-- low case is not allowed
+
+ if (!IsLegalChar(c,anAllowWildCards,aUseExtendedChars,aInScanDrive))
+ {
+ return EFalse;
+ }
+
+ if (aIsForFileCreation)
+ {
+ if ((aUseExtendedChars && (TUint) c > KExtendedCharEnd) ||
+ (!aUseExtendedChars && (TUint) c > KExtendedCharStart))
+ {
+ return EFalse;
+ }
+ }
+
+ if (c!=KMatchAny)
+ if (++valid>KMaxFatFileNameWithoutExt)
+ return EFalse;
+ }
+
+ //-- check entry extension
+ valid=0;
+ while (i<count)
+ {
+ TChar c=aName[i++];
+ if (c==KExtDelimiter)
+ return EFalse;
+
+ if(!aAllowLowerCase && c.IsLower())
+ return EFalse; //-- low case is not allowed
+
+ if (!IsLegalChar(c,anAllowWildCards,aUseExtendedChars,aInScanDrive))
+ return EFalse;
+
+ if (aIsForFileCreation)
+ {
+ if ((aUseExtendedChars && (TUint) c > KExtendedCharEnd) ||
+ (!aUseExtendedChars && (TUint) c > KExtendedCharStart))
+ {
+ return EFalse;
+ }
+ }
+
+ if (c!=KMatchAny)
+ if (++valid>KMaxFatFileNameExt)
+ return EFalse;
+ }
+
+ // Unicode file name checking for file opening.
+ if (!aIsForFileCreation && GetFatUtilityFunctions())
+ {
+ TBuf8<KMaxFileName*2> convertedName8;
+ TRAPD(err, LocaleUtils::ConvertFromUnicodeL(convertedName8, aName, TFatUtilityFunctions::EOverflowActionLeave));
+ if (err != KErrNone)
+ return EFalse;
+
+ const TInt len8 = convertedName8.Length();
+ TInt j = 0;
+ TInt nonWildChar = 0;
+ while (j < len8)
+ {
+ const TUint8 c8 = convertedName8[j++];
+ if (c8 == KExtDelimiter)
+ break;
+ if (c8 == '*' && !anAllowWildCards)
+ return EFalse;
+ if (c8 == '*' && anAllowWildCards)
+ continue;
+
+ if (++nonWildChar > KMaxFatFileNameWithoutExt)
+ return EFalse;
+ }
+
+ // check extension part
+ nonWildChar = 0;
+ while (j < len8)
+ {
+ const TUint8 c8 = convertedName8[j++];
+ if (c8 == KExtDelimiter)
+ return EFalse;
+ if (c8 == '*' && !anAllowWildCards)
+ return EFalse;
+ if (c8 == '*' && anAllowWildCards)
+ continue;
+
+ if (++nonWildChar > KMaxFatFileNameExt)
+ return EFalse;
+ }
+ }
+
+ return ETrue;
+ }
+
+/**
+ Check whether a Dos name is legal or not. Unicode version
+ parameters and return value absolutely the same as in DoCheckLegalDosName()
+*/
+TBool IsLegalDosName(const TDesC16& aName, TBool anAllowWildCards, TBool aUseExtendedChars, TBool aInScanDrive, TBool aAllowLowerCase, TBool aIsForFileCreation)
+ {
+
+ __PRINT(_L("IsLegalDosName 16"));
+
+ return DoCheckLegalDosName(aName, anAllowWildCards, aUseExtendedChars, aInScanDrive, aAllowLowerCase, aIsForFileCreation);
+ }
+
+TBool CFatMountCB::FindShortNameL(const TShortName& aName,TEntryPos& anEntryPos)
+//
+// Returns ETrue and the entryPos of aName if found or EFalse
+//
+ {
+
+ __PRINT(_L("VFAT::CFatMountCB::FindShortNameL"));
+ TFatDirEntry fatEntry;
+ TInt count=0;
+ FOREVER
+ {
+ count++;
+ ReadDirEntryL(anEntryPos,fatEntry);
+ MoveToDosEntryL(anEntryPos,fatEntry);
+ if (fatEntry.IsEndOfDirectory())
+ break;
+ if (IsRootDir(anEntryPos)&&(anEntryPos.iPos+StartOfRootDirInBytes()==(RootDirEnd()-KSizeOfFatDirEntry)))
+ if (fatEntry.IsErased())
+ break;//Allows maximum number of entries in root directory
+ if (fatEntry.Name()==aName)
+ return ETrue;
+ MoveToNextEntryL(anEntryPos);
+ if (IsRootDir(anEntryPos)&&(StartOfRootDirInBytes()+anEntryPos.iPos==RootDirEnd()))
+ break;//Allows maximum number of entries in root directory
+ }
+ return EFalse;
+ }
+
+TBool CFatMountCB::IsUniqueNameL(const TShortName& aName,TInt aDirCluster)
+//
+// Returns ETrue if aName is unique, EFalse if a matching name is found.
+//
+ {
+
+ __PRINT(_L("VFAT::CFatMountCB::IsUniqueNameL"));
+ TEntryPos entryPos(aDirCluster,0);
+ if (FindShortNameL(aName,entryPos))
+ return(EFalse);
+ return(ETrue);
+ }
+
+void CFatMountCB::ReplaceClashingNameL(const TShortName& aNewName,const TEntryPos& anEntryPos)
+//
+// A legal dos name has been typed that clashes with a computer generated shortname
+// Change the shortname to something else.
+//
+ {
+
+ __PRINT(_L("VFAT::CFatMountCB::ReplaceClashingNameL"));
+ TFatDirEntry entry;
+ ReadDirEntryL(anEntryPos,entry);
+ __ASSERT_ALWAYS(entry.IsEndOfDirectory()==EFalse,User::Leave(KErrCorrupt));
+ entry.SetName(aNewName);
+ WriteDirEntryL(anEntryPos,entry);
+// We now need to fix up VFAT entries with a new checksum reflecting new shortname
+// Calculate new checksum
+ TUint8 checksum=CalculateShortNameCheckSum(aNewName);
+// Now go back and adjust all VFAT entries corresponding to this shortname
+ TEntryPos entryPos=anEntryPos;
+ FOREVER
+ {
+ entryPos.iPos-=KSizeOfFatDirEntry;
+ ReadDirEntryL(entryPos,entry);
+ entry.iData[0x0D]=checksum;
+ if (entry.iData[0]&0x40)
+ break;
+ }
+ }
+
+TBool CFatMountCB::GenerateShortNameL(TInt aDirCluster,const TDesC& aName,TShortName& aGeneratedName, TBool aForceRandomize)
+//
+// Generate a legal dos filename as an alias for aName.
+// Returns ETrue if aName is a legal dos name.
+//
+ {
+
+ __PRINT(_L("VFAT::CFatMountCB::GenerateShortNameL"));
+ // Given the long file-name "ABCDEFGHI.TXT", EPOC used to generate short
+ // file-names in the following pecking order:
+ // "ABCDEFGH.TXT",
+ // "ABCDEF~0.TXT",
+ // "ABCDEF~1.TXT",
+ // "ABCDEF~2.TXT",
+ // etc.
+ // Now, however, EPOC behaves in a more Windows-like manner and
+ // generates short file-names in this pecking order:
+ // "ABCDEF~1.TXT",
+ // "ABCDEF~2.TXT",
+ // "ABCDEF~3.TXT",
+ // "ABCDEF~4.TXT",
+ // After failing to find an unused short name 4 times in a row,
+ // a random number is used to speed up the process. So subsequent
+ // short-file names become
+ // "ABC~nnnn.TXT" where nnnn is a random number
+ //
+ TBool useTildeSelectively = ETrue;
+ TInt endNum = KMaxDuplicateShortName; // 0xFFFF
+ const TInt KMaxNonRandomShortFileNames = 4;
+
+ TInt i = 1;
+
+ TBool randomize = aForceRandomize;
+ if (randomize)
+ {
+ i = (TInt) (Math::Random() & KMaxDuplicateShortName);
+ endNum = (i - 1) & KMaxDuplicateShortName;
+ }
+
+ while(i != endNum)
+ {
+ aGeneratedName=DoGenerateShortNameL(aName,i,useTildeSelectively);
+
+ if (IsUniqueNameL(aGeneratedName,aDirCluster))
+ break;
+
+ if (i == KMaxNonRandomShortFileNames && !randomize)
+ {
+ randomize = ETrue;
+ i = (TInt) (Math::Random() & KMaxDuplicateShortName);
+ endNum = (i - 1) & KMaxDuplicateShortName;
+ }
+ else if (i == -1)
+ {
+ useTildeSelectively=EFalse;
+ i = 1;
+ }
+ else
+ i = (i + 1) & KMaxDuplicateShortName;
+ }
+
+ if (i == endNum)
+ User::Leave(KErrAlreadyExists);
+
+ if((i == -1) && IsLegalDosName(aName,EFalse,EFalse,EFalse,EFalse,ETrue))
+ {
+ // Original file name is a legal 8.3 name
+ return(ETrue);
+ }
+ else
+ {
+ return(EFalse);
+ }
+
+
+ }
+
+void TFatDirEntry::InitializeAsVFat(TUint8 aCheckSum)
+//
+// Initialize a FAT entry as a VFAT filename
+//
+ {
+
+ Mem::Fill(this,sizeof(SFatDirEntry),0xFF);
+ iData[0x0B]=0x0F;
+ iData[0x0C]=0x00; iData[0x0D]=aCheckSum;
+ iData[0x1A]=0x00; iData[0x1B]=0x00;
+ }
+
+void TFatDirEntry::SetVFatEntry(const TDesC& aName,TInt aLen)
+//
+// Write up to KMaxVFatEntryName unicode chars from aName to the entry
+//
+ {
+
+ TInt rem=aName.Length()-aLen;
+ TPtrC section(aName.Ptr()+aLen,Min(rem,KMaxVFatEntryName));
+ TBuf16<KMaxVFatEntryName> buf16;
+ buf16.Copy(section);
+ if (rem<KMaxVFatEntryName)
+ {
+ rem++;
+ buf16.ZeroTerminate();
+ buf16.SetLength(rem); // Zero termination doesn't increase the buf length
+ }
+ TUint8 orderNo=(TUint8)(aLen/KMaxVFatEntryName+1);
+ TInt s=Min(rem,5);
+ Mem::Copy(&iData[0x01],buf16.Ptr(),s*2);//Copy up to 10 bytes of buf16 into iData
+ TInt offset=s;
+ rem-=s;
+ s=Min(rem,6);
+ Mem::Copy(&iData[0x0E],buf16.Ptr()+offset,s*2);
+ offset+=s;
+ rem-=s;
+ s=Min(rem,2);
+ Mem::Copy(&iData[0x1C],buf16.Ptr()+offset,s*2);
+ rem-=s;
+ if (rem==0)
+ orderNo|=0x40;
+ iData[0]=orderNo;
+ }
+
+void TFatDirEntry::ReadVFatEntry(TDes16& aBuf) const
+//
+// Read KMaxVFatEntryName unicode chars from the entry
+//
+ {
+
+ aBuf.SetLength(KMaxVFatEntryName);
+ Mem::Copy(&aBuf[0],&iData[0x01],5*2);
+ Mem::Copy(&aBuf[5],&iData[0x0E],6*2);
+ Mem::Copy(&aBuf[11],&iData[0x1C],2*2);
+ }
+
+void CFatMountCB::WriteDirEntryL(TEntryPos& aPos,const TFatDirEntry& aFatDirEntry,const TDesC& aLongName)
+//
+// Write a VFAT directory entry to disk at position aPos - leave aPos refering to the dos entry
+// Assumes sufficient space has been created for it by AddDirEntry.
+//
+ {
+
+ __PRINT(_L("VFAT::CFatMountCB::WriteDirEntryL"));
+ __ASSERT_DEBUG(aLongName.Length(),Fault(EVFatNoLongName));
+ TEntryPos startPos(aPos.iCluster,aPos.iPos);
+ TUint8 localBuf[KDefaultSectorSize];
+ TUint8 cksum=CalculateShortNameCheckSum(aFatDirEntry.Name());
+ TInt numEntries=NumberOfVFatEntries(aLongName.Length())-1; // Excluding dos entry
+ // see if all entries written to one sector
+ // single sector writes not supported if sector size>default size
+ TInt dosOffset=numEntries<<KSizeOfFatDirEntryLog2;
+ TInt absolutePos=(aPos.iCluster<<ClusterSizeLog2())+ClusterRelativePos(aPos.iPos);
+ TBool isSameSector=(((absolutePos^(absolutePos+dosOffset))>>SectorSizeLog2())==0 && ((TUint)(1<<SectorSizeLog2())<=KDefaultSectorSize));
+ TFatDirEntry vFatEntry;
+ vFatEntry.InitializeAsVFat(cksum);
+ TInt offset=0;
+ while (numEntries--)
+ {
+ vFatEntry.SetVFatEntry(aLongName,KMaxVFatEntryName*numEntries);// KMaxVFatEntryName=13
+ if(isSameSector)
+ {
+ Mem::Copy(&localBuf[offset],&vFatEntry,KSizeOfFatDirEntry);
+ offset+=KSizeOfFatDirEntry;
+ MoveToNextEntryL(aPos);
+ }
+ else
+ {
+ WriteDirEntryL(aPos,vFatEntry);
+ MoveToNextEntryL(aPos);
+ }
+ }
+ if(isSameSector)
+ {
+ Mem::Copy(&localBuf[offset],&aFatDirEntry,KSizeOfFatDirEntry);
+
+ //-- use special interface to access FAT directory file
+ DirWriteL(startPos,TPtrC8(&localBuf[0],dosOffset+KSizeOfFatDirEntry));
+ }
+ else
+ WriteDirEntryL(aPos,aFatDirEntry);
+ }
+
+void CFatMountCB::EraseDirEntryL(TEntryPos aPos,const TFatDirEntry& aFirstEntry)
+//
+// Mark all entries in a VFat directory entry as erased
+//
+ {
+ __PRINT(_L("VFAT::CFatMountCB::EraseDirEntryL"));
+ TInt numEntries=0;
+ if (aFirstEntry.IsVFatEntry())
+ numEntries=aFirstEntry.NumFollowing();
+ if(IsRuggedFSys()&&numEntries)
+ {
+ TInt count=numEntries;
+ TEntryPos pos=aPos;
+ while(count--)
+ MoveToNextEntryL(pos);
+ EraseDirEntryL(pos);
+ numEntries--;
+ }
+ FOREVER
+ {
+ EraseDirEntryL(aPos);
+ if (!numEntries--)
+ break;
+ MoveToNextEntryL(aPos);
+ }
+ }
+
+
+void LocaleUtils::ConvertFromUnicodeL(TDes8& aForeign, const TDesC16& aUnicode, TFatUtilityFunctions::TOverflowAction aOverflowAction)
+//
+// Convert the volume label using the algorithm specified in the current locale-DLL.
+//
+ {
+ if(aOverflowAction == TFatUtilityFunctions::EOverflowActionLeave)
+ {
+ GetCodePage().ConvertFromUnicodeL(aForeign, aUnicode, TCodePageUtils::EOverflowActionLeave);
+ }
+ else
+ {
+ GetCodePage().ConvertFromUnicodeL(aForeign, aUnicode, TCodePageUtils::EOverflowActionTruncate);
+ }
+ }
+
+void LocaleUtils::ConvertToUnicodeL(TDes16& aUnicode, const TDesC8& aForeign, TFatUtilityFunctions::TOverflowAction aOverflowAction)
+//
+// Convert the volume label using the algorithm specified in the current locale-DLL.
+//
+ {
+ if(aOverflowAction == TFatUtilityFunctions::EOverflowActionLeave)
+ {
+ GetCodePage().ConvertToUnicodeL(aUnicode, aForeign, TCodePageUtils::EOverflowActionLeave);
+ }
+ else
+ {
+ GetCodePage().ConvertToUnicodeL(aUnicode, aForeign, TCodePageUtils::EOverflowActionTruncate);
+ }
+ }
+
+TBool LocaleUtils::IsLegalShortNameCharacter(TUint aCharacter,TBool aUseExtendedChars)
+//
+// Convert the volume label using the algorithm specified in the current locale-DLL.
+//
+ {
+ return GetCodePage().IsLegalShortNameCharacter(aCharacter, aUseExtendedChars);
+ }