persistentstorage/sql/SRC/Server/SqlSrvUtil.cpp
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// Copyright (c) 2006-2010 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#include <stdlib.h>				//wchar_t
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#include "SqlAssert.h"
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#include "SqlSrvUtil.h"
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#include "OstTraceDefinitions.h"
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#ifdef OST_TRACE_COMPILER_IN_USE
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#include "SqlSrvUtilTraces.h"
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#endif
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#include "SqlTraceDef.h"
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#ifdef _SQL_AUTHORIZER_TRACE_ENABLED
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//Used in PrintAuthorizerArguments()
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_LIT8(KCreateIndex,			"Create index");			//SQLITE_CREATE_INDEX
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_LIT8(KCreateTable, 		"Create table");			//SQLITE_CREATE_TABLE
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_LIT8(KCreateTempIndex, 	"Create temp index");		//SQLITE_CREATE_TEMP_INDEX
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_LIT8(KCreateTempTable, 	"Create temp table");		//SQLITE_CREATE_TEMP_TABLE
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_LIT8(KCreateTempTrigger, 	"Create temp trigger");		//SQLITE_CREATE_TEMP_TRIGGER
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_LIT8(KCreateTempView, 		"Create temp view");		//SQLITE_CREATE_TEMP_VIEW
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_LIT8(KCreateTrigger, 		"Create trigger");			//SQLITE_CREATE_TRIGGER
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_LIT8(KCreateView, 			"Create view");				//SQLITE_CREATE_VIEW
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_LIT8(KDelete, 				"DELETE");					//SQLITE_DELETE
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_LIT8(KDropIndex, 			"Drop index");				//SQLITE_DROP_INDEX
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_LIT8(KDropTable, 			"Drop table");				//SQLITE_DROP_TABLE
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_LIT8(KDropTempIndex, 		"Drop temp index");			//SQLITE_DROP_TEMP_INDEX
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_LIT8(KDropTempTable, 		"Drop temp table");			//SQLITE_DROP_TEMP_TABLE
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_LIT8(KDropTempTrigger, 	"Drop temp trigger");		//SQLITE_DROP_TEMP_TRIGGER
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_LIT8(KDropTempView, 		"Drop temp view");			//SQLITE_DROP_TEMP_VIEW
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_LIT8(KDropTrigger, 		"Drop trigger");			//SQLITE_DROP_TRIGGER
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_LIT8(KDropView, 			"Drop view");				//SQLITE_DROP_VIEW
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_LIT8(KInsert, 				"INSERT");					//SQLITE_INSERT
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_LIT8(KPragma, 				"PRAGMA");					//SQLITE_PRAGMA
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_LIT8(KRead, 				"Read");					//SQLITE_READ
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_LIT8(KSelect, 				"SELECT");					//SQLITE_SELECT
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_LIT8(KTransaction, 		"TRANSACTION");				//SQLITE_TRANSACTION
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_LIT8(KUpdate, 				"UPDATE");					//SQLITE_UPDATE
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_LIT8(KAttach, 				"ATTACH");					//SQLITE_ATTACH
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_LIT8(KDetach, 				"DETACH");					//SQLITE_DETACH
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_LIT8(KAlterTable, 			"Alter table");				//SQLITE_ALTER_TABLE
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_LIT8(KReindex, 			"Reindex");					//SQLITE_REINDEX
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_LIT8(KAnalyze, 			"Analyze");					//SQLITE_ANALYZE
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_LIT8(KCreateVTable, 		"Create virt.table");		//SQLITE_CREATE_VTABLE
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_LIT8(KDropVTable, 			"Drop virt.table");			//SQLITE_DROP_VTABLE
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_LIT8(KFunctionCall, 		"Function call");			//SQLITE_FUNCTION
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_LIT8(KNull, 				"NULL");
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_LIT8(KInvalid, 			"INVALID");
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//Used in PrintAuthorizerArguments()
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const TPtrC8 KDbOpNames[] = 
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	{
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	KCreateIndex(),	KCreateTable(), KCreateTempIndex(), KCreateTempTable(), KCreateTempTrigger(),
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	KCreateTempView(), KCreateTrigger(), KCreateView(), KDelete(), KDropIndex(), 
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	KDropTable(), KDropTempIndex(), KDropTempTable(), KDropTempTrigger(), KDropTempView(),
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	KDropTrigger(), KDropView(), KInsert(), KPragma(), KRead(), 
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	KSelect(), KTransaction(), KUpdate(), KAttach(), KDetach(), KAlterTable(), KReindex(), KAnalyze(),
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	KCreateVTable(), KDropVTable(), KFunctionCall()
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	};
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#ifdef _DEBUG
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const TInt KMaxOpCodes = sizeof(KDbOpNames) / sizeof(KDbOpNames[0]);
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#endif
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/**
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This function has a defined implementaion only in _DEBUG mode and is used to print the authorizer arguments.
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@internalComponent
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*/
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void PrintAuthorizerArguments(TInt aDbOpType, const char* aDbObjName1, const char* aDbObjName2, 
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							  const char* aDbName, const char* aTrgOrViewName)
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	{
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	__ASSERT_DEBUG(aDbOpType > 0 && aDbOpType <= KMaxOpCodes, __SQLPANIC2(ESqlPanicInternalError));
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	//TPtrC8 objects cannot be used for the function arguments, because the arguments may not be 16-bit aligned!!!	
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	TBuf<20> opName;
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	opName.Copy(KDbOpNames[aDbOpType - 1]);
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	TBuf<64> dbObjName1; 
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	dbObjName1.Copy(KNull);
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	if(aDbObjName1)
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		{
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		dbObjName1.Copy(KInvalid);
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		if(User::StringLength((const TUint8*)aDbObjName1) <= dbObjName1.MaxLength())
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			{
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			dbObjName1.Copy(TPtrC8(reinterpret_cast <const TUint8*> (aDbObjName1)));
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			}
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		}
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	TBuf<64> dbObjName2; 
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	dbObjName2.Copy(KNull);
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	if(aDbObjName2)
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		{
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		dbObjName2.Copy(KInvalid);
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   108
		if(User::StringLength((const TUint8*)aDbObjName2) <= dbObjName2.MaxLength())
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   109
			{
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			dbObjName2.Copy(TPtrC8(reinterpret_cast <const TUint8*> (aDbObjName2)));
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			}
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		}
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	TBuf<64> dbName; 
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	dbName.Copy(KNull);
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	if(aDbName)
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		{
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		dbName.Copy(KInvalid);
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		if(User::StringLength((const TUint8*)aDbName) <= dbName.MaxLength())
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   119
			{
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			dbName.Copy(TPtrC8(reinterpret_cast <const TUint8*> (aDbName)));
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			}
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		}
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   123
	TBuf<64> trgOrViewName; 
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	trgOrViewName.Copy(KNull);
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	if(aTrgOrViewName)
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		{
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		trgOrViewName.Copy(KInvalid);
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		if(User::StringLength((const TUint8*)aTrgOrViewName) <= trgOrViewName.MaxLength())
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			{
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			trgOrViewName.Copy(TPtrC8(reinterpret_cast <const TUint8*> (aTrgOrViewName)));
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			}
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		}
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   133
		
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	SQL_TRACE_AUTHORIZER(OstTraceExt5(TRACE_INTERNALS, SQLAUTHORIZER, "0;PrintAuthorizerArguments;%20.20S;%40.40S;%10.10S;%10.10S;%10.10S", __SQLPRNSTR(opName), __SQLPRNSTR(dbObjName1), __SQLPRNSTR(dbObjName2), __SQLPRNSTR(dbName), __SQLPRNSTR(trgOrViewName)));
0
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	}
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#endif//_SQL_AUTHORIZER_TRACE_ENABLED
0
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   137
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/**
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Converts a UTF16 encoded descriptor to a UTF8 encoded descriptor.
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Note: the function works only for input descriptors with length less or equal than KMaxFileName.
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   141
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@param aIn  The input UTF16 encoded descriptor,
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@param aOut The output buffer where the converted input descriptor will be stored. 
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@return True if the conversion was successful, false otherwise.
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   145
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@panic SqlDb 4 In _DEBUG mode if aIn length is bigger than KMaxFileName.
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@panic SqlDb 4 In _DEBUG mode if aOut max length is less than KMaxFileName.
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@internalComponent
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*/
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TBool UTF16ToUTF8(const TDesC& aIn, TDes8& aOut)
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	{
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    __ASSERT_DEBUG(aIn.Length() <= KMaxFileName, __SQLPANIC2(ESqlPanicBadArgument));
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    __ASSERT_DEBUG(aOut.MaxLength() >= KMaxFileName, __SQLPANIC2(ESqlPanicBadArgument));
0
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	TBuf16<KMaxFileName + 1> des;
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	des.Copy(aIn);
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	des.Append(TChar(0));
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	TInt len = wcstombs((char*)aOut.Ptr(), (const wchar_t*)des.Ptr(), KMaxFileName);
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	//Check the file name length. If it is longer than KMaxFileName characters, then the file name is not valid.
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	if((TUint)len <= KMaxFileName)
0
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		{
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		aOut.SetLength(len);
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		return ETrue;
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		}
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	return EFalse;
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	}
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   167
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   168
/**
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   169
Converts a zero-terminated, UTF16 encoded file name to a zero-terminated, UTF8 encoded file name.
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@param aFileName The input file name buffer. aFileName argument is expected to point to UTF16 encoded, 
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				 zero terminated string,
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   172
@param aFileNameDestBuf The output file name buffer where the converted input file name will be stored. 
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   173
						The output file name buffer max length should be at least KMaxFileName + 1.
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   174
@return True if the conversion was successful, false otherwise.
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   175
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@panic SqlDb 4 In _DEBUG mode if aFileName length is bigger than KMaxFileName + 1.
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@panic SqlDb 4 In _DEBUG mode if aFileName is not zero-terminated or if aFileNameDestBuf max length is less than KMaxFileName + 1.
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@internalComponent
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*/
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   181
TBool UTF16ZToUTF8Z(const TDesC& aFileName, TDes8& aFileNameDestBuf)
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	{
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	__ASSERT_DEBUG(aFileName.Length() <= (KMaxFileName + 1), __SQLPANIC2(ESqlPanicBadArgument));
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	__ASSERT_DEBUG(aFileName[aFileName.Length() - 1] == 0, __SQLPANIC2(ESqlPanicBadArgument));
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	__ASSERT_DEBUG(aFileNameDestBuf.MaxLength() >= (KMaxFileName + 1), __SQLPANIC2(ESqlPanicBadArgument));
0
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	const wchar_t* src = reinterpret_cast <const wchar_t*> (aFileName.Ptr());
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	TInt len = wcstombs((char*)aFileNameDestBuf.Ptr(), src, KMaxFileName);
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	//Check the file name length. If it is longer than KMaxFileName characters, then the file name is not valid.
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   189
	if((TUint)len <= KMaxFileName)
0
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		{
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		aFileNameDestBuf.SetLength(len + 1);
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		aFileNameDestBuf[len] = 0;
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		return ETrue;
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   194
		}
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   195
	return EFalse;
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	}
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   197
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   198
/**
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   199
Converts a UTF16 encoded file name to a zero-terminated, UTF8 encoded file name.
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@param aFileName The input file name buffer. aFileName argument is expected to point to UTF16 encoded string,
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   201
@param aFileNameDestBuf The output file name buffer where the converted input file name will be stored. 
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						The output file name buffer max length should be at least KMaxFileName + 1.
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@return True if the conversion was successful, false otherwise.
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   204
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@panic SqlDb 4 In _DEBUG mode if aFileName length is bigger than KMaxFileName.
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@panic SqlDb 4 In _DEBUG mode if aFileNameDestBuf max length is less than KMaxFileName + 1.
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@internalComponent
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*/
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TBool UTF16ToUTF8Z(const TDesC& aFileName, TDes8& aFileNameDestBuf)
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	{
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	__ASSERT_DEBUG(aFileName.Length() <= KMaxFileName, __SQLPANIC2(ESqlPanicBadArgument));
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	__ASSERT_DEBUG(aFileNameDestBuf.MaxLength() >= (KMaxFileName + 1), __SQLPANIC2(ESqlPanicBadArgument));
0
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	TBool rc = ::UTF16ToUTF8(aFileName, aFileNameDestBuf);
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	if(rc)
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		{
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		aFileNameDestBuf.Append(0);
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		}
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	return rc;
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	}
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//Returns true if aDbFileName is a read-only file
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TBool IsReadOnlyFileL(RFs& aFs, const TDesC& aDbFileName)
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	{
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	TEntry entry;
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	TInt err = aFs.Entry(aDbFileName, entry);
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	if(err == KErrNotFound)
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		{//Non-existing file
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		return EFalse;	
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		}
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	__SQLLEAVE_IF_ERROR2(err);
0
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	return entry.IsReadOnly();
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	}