genericopenlibs/openenvcore/backend/src/StdioRedir/Server/inidata.cpp
author Brendan Donegan <brendand@symbian.org>
Thu, 29 Apr 2010 14:59:41 +0100
branchRCL_3
changeset 29 3520f1ef6bf6
parent 0 e4d67989cc36
permissions -rw-r--r--
Fix for Bug 2603 - OpenEnv CIniData does not understand Unix line endings
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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// Copyright (c) 2007-2009 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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// Name        : inidata.cpp
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// Part of     : stdio server
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// To read ini file
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// 
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//
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 #include "inidata.h"
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 #include <f32file.h>
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 #include <e32std.h>
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 // Default directory to look for INI file
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 _LIT(KIniFileDir,"\\System\\Data\\");
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 const TInt KTokenSize=256;
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 enum TIniPanic
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     {
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     ESectionNameTooBig,
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     EKeyNameTooBig,
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     };
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 ////////////////////////////////////////////////////////////////////////////////
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 void Panic(TIniPanic aPanic)
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     {
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     _LIT(CIniData,"stdioserver");
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     User::Panic(CIniData,aPanic);
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     }
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 CIniData::CIniData()
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     : iPtr(NULL,0)
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 /* Constructor
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 */
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     {
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     __DECLARE_NAME(_S("CIniData"));
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     }
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 CIniData::~CIniData()
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 /*Destructor.
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  Frees the resources located in second-phase constructor
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 */
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     {
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     delete (TText*)iPtr.Ptr();
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     delete iToken;
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     delete iName;
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     }
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 CIniData* CIniData::NewL(const TDesC& aName)
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 /*
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  Creates, and returns a pointer to CIniData object, leave on failure
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  @return A pointer to the CiniData object
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 */
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     {
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     CIniData* p=new(ELeave) CIniData;
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     CleanupStack::PushL(p);
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     p->ConstructL(aName);
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     CleanupStack::Pop();
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     return p;
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     }
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 void CIniData::ConstructL(const TDesC& aName)
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 /*
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  Second-phase constructor.
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  The function attempts to allocate a buffer and Read file's contents into iPtr
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  @param aName the name of the file which contains the ini data
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  @leave One of the system-wide error codes
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 */
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     {
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     // Allocate space for token
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     iToken=HBufC::NewL(KTokenSize+2);   // 2 extra chars for [tokenName]
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     // Connect to file server
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     TAutoClose<RFs> fs;
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     User::LeaveIfError(fs.iObj.Connect());
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     fs.PushL();
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	 //Add system drive to KIniFileDir with path delemiter
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	 TBuf16<30> iniFilePath;
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	 iniFilePath.Append(fs.iObj.GetSystemDriveChar());
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	 iniFilePath.Append(TChar(KDriveDelimiter));
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	 iniFilePath.Append(KIniFileDir);
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     // Find file, given name
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     TFindFile ff(fs.iObj);
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     User::LeaveIfError(ff.FindByDir(aName, iniFilePath));
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     iName=ff.File().AllocL();
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     // Open file
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     TAutoClose<RFile> file;
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     TInt size;
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     User::LeaveIfError(file.iObj.Open(fs.iObj,*iName,EFileStreamText|EFileShareReadersOrWriters));
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     file.PushL();
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     // Get file size and read in
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     User::LeaveIfError(file.iObj.Size(size));
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     TText* data=(TText*)User::AllocL(size);
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     iPtr.Set(data, size/sizeof(TText), size/sizeof(TText));
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     TPtr8 dest((TUint8*)data, 0, size);
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     User::LeaveIfError(file.iObj.Read(dest));
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     TUint8* ptr = (TUint8*)data;
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     //
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     // This is orderred as FEFF assuming the processor is Little Endian
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     // The data in the file is FFFE.        PRR 28/9/98
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     //
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     if(size>=(TInt)sizeof(TText) && iPtr[0]==0xFEFF)
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     {
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         // UNICODE Text file so lose the FFFE
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         Mem::Copy(ptr, ptr+sizeof(TText), size-sizeof(TText));
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         iPtr.Set(data, size/sizeof(TText)-1, size/sizeof(TText)-1);
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     }
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     else if(size)
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     {
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         // NON-UNICODE so convert to UNICODE
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         TText* newdata = (TText*)User::AllocL(size*sizeof(TText));
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         iPtr.Set(newdata, size, size);
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         TInt i;
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         for(i=0 ; i<size ; ++i)
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             iPtr[i]=ptr[i];
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         delete data;
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     }
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     file.Pop();
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     fs.Pop();
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 }
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 ////////////////////////////////////////////////////////////////////////////////
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 //
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 // Find a key's value given a section name and a key name
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 //
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 TBool CIniData::FindVar(const TDesC &aSectName,const TDesC &aKeyName,TPtrC &aResult)
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 	{
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 	TInt posStartOfSection(0);
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 	TInt posEndOfSection(iPtr.Length()); // Default to the entire length of the ini data
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 	TPtrC SearchBuf;
0
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 	// If we have a section, set pos to section start
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 	TInt posI(0);	// Position in internal data Buffer
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 	if( aSectName.Length() > 0 )
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 		{
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 		TBool FoundSection(false);
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 		while ( ! FoundSection )
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 			{
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 			// Move search buffer to next area of interest
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 			SearchBuf.Set(iPtr.Mid(posI));
0
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 			// Make up token "[SECTIONNAME]", to search for
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 			TPtr sectionToken=iToken->Des();
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 			_LIT(sectionTokenFmtString,"[%S]");
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 			sectionToken.Format(sectionTokenFmtString,&aSectName);
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 			// Search for next occurrence of aSectName
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 			TInt posSB = SearchBuf.Find(sectionToken);
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 			if (posSB==KErrNotFound)
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 				return(EFalse);
0
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 			// Check this is at beginning of line (ie. non-commented)
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 			// ie. Check preceding char was LF
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 			if(posSB>0)
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 				{
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 				// Create a Buffer, starting one char before found subBuf
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 				TPtrC CharBefore(SearchBuf.Right(SearchBuf.Length()-posSB+1));
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 				// Check first char is end of prev
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 				if(CharBefore[0] == '\n')
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 					{
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 					FoundSection = ETrue;		// found
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 					posI = posI + posSB;
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 					}
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 				else
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 					{
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 					posI = posI + posSB + 1;	// try again
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 					}
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 				}
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 			else
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 				{
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 				FoundSection = ETrue;
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 				}
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 			}	// while ( ! FoundSection ) 
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 		// Set start of section, after section name, (incl '[' and ']')
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 		posStartOfSection = posI + aSectName.Length() + 2;
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 		// Set end of section, by finding begin of next section or end
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 		SearchBuf.Set(iPtr.Mid(posI));
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 		_LIT(nextSectionBuf,"\n[");
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 		TInt posSB = SearchBuf.Find(nextSectionBuf);
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 		if(posSB != KErrNotFound)
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 			{
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 			posEndOfSection = posI + posSB;
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 			}
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 		else
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 			{
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 			posEndOfSection = iPtr.Length();
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 			}
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 		}	// if( aSectName.Length() > 0 )
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 	// Look for key in ini file data Buffer
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 	posI = posStartOfSection;
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 	TBool FoundKey(false);
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 	while ( ! FoundKey )
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 		{
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 		// Search for next occurrence of aKeyName
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 		SearchBuf.Set(iPtr.Mid(posI,posEndOfSection-posI));
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 		TInt posSB = SearchBuf.Find(aKeyName);
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 		// If not found, return
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 		if (posSB==KErrNotFound)
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 			return(EFalse);
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 		// Check this is at beginning of line (ie. non-commented)
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 		// ie. Check preceding char was CR or LF
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 		if(posSB>0)
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 			{
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 			// Create a Buffer, starting one char before found subBuf
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 			TPtrC CharBefore(SearchBuf.Right(SearchBuf.Length()-posSB+1));
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 			// Check if the first char is end of prev and also check 
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 			// if the token found is not a substring of another string  
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 			TBool beginningOK = ((CharBefore[0] == '\n') || (CharBefore[0] == ' ') || (CharBefore[0] == '\t'));
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 			TBool endingOK = ((CharBefore[aKeyName.Length()+1] == '=') || (CharBefore[aKeyName.Length()+1] == ' ') || (CharBefore[aKeyName.Length()+1] == '\t'));
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 			if (beginningOK && endingOK)
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 				{
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 				FoundKey = ETrue;
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 				posI = posI + posSB;
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 				}
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 			else
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 				{
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 				posI = posI + posSB + 1;
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 				}
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 			}
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 		else
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 			{
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 			FoundKey = ETrue;
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 			}
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 		}	// while ( ! FoundKey )
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 	// Set pos, to just after '=' sign
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 	SearchBuf.Set(iPtr.Mid(posI));
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 	TInt posSB = SearchBuf.Locate('=');
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 	if(posSB==KErrNotFound)		// Illegal format, should flag this...
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 		return(EFalse);
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 	// Identify start and end of data (EOL or EOF)
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 	posI = posI + posSB + 1;	// 1 char after '='
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 	TInt posValStart = posI;
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 	TInt posValEnd;
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 	SearchBuf.Set(iPtr.Mid(posI));
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 	posSB = SearchBuf.Locate('\n');
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 	if(posSB!=KErrNotFound)
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 		{
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      		// ini file uses LF for EOL 
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             posValEnd = posI + posSB; 
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 		}
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 	else
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 		{
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 		posValEnd = iPtr.Length();
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 		}
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 	// Check we are still in the section requested
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 	if( aSectName.Length() > 0 )
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 		{
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 		if( posValEnd > posEndOfSection )
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 			{
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 			return(EFalse);
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 			}
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 		}
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 	// Parse Buffer from posn of key
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 	// Start one space after '='
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 	TLex lex(iPtr.Mid(posValStart, posValEnd-posValStart));
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 	lex.SkipSpaceAndMark();		// Should be at the start of the data
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 	aResult.Set(lex.MarkedToken().Ptr(),posValEnd-posValStart - lex.Offset() );
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 	TInt filterOffset;
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   303
 	
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 	// Mark the offset value to the end of the value string
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 	filterOffset = aResult.Length() - 1;
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 	// Loop from end of the value string marked by the offset fetched by above process
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     // And check to see if there is spaces, tabs or carriage returns
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 	while(filterOffset >= 0 &&
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 		(aResult[filterOffset] == '\t' ||
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          aResult[filterOffset] == ' ' ||
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          aResult[filterOffset] == '\r'))
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 		{
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 		// If found, reduce the offset by 1 for every space and tab during the while loop
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 		filterOffset--;
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 		}
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 	// The final offset value indicating end of actual value
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 	// within the ini data is set to the result string reference passed in
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 	aResult.Set(aResult.Mid(0,filterOffset + 1));
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 	return(ETrue);
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 	}
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////////////////////////////////////////////////////////////////////////////////
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TBool CIniData::FindVar(const TDesC &aSection,const TDesC &aKeyName,TInt &aResult)
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/* Find an integer value from given aKeyName and aSecName in the ini data file
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@param aSectName Section containing key
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@param aKeyName Key being searched for  in aSectName
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@param aResult On return, contains TInt result
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@return ETrue if found, otherwise EFalse
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*/
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{
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TPtrC ptr(NULL,0);
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if (FindVar(aSection,aKeyName,ptr))
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    {
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    TLex lex(ptr);
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    if (lex.Val(aResult)==KErrNone)
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        return(ETrue);
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    }
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return(EFalse);
e4d67989cc36 Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   345
}