// Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "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:

// Parse the ini file

// 

//

/**

@file

@test

@internalComponent

*/

#include "PARSEINIDATA.H"

#include <f32file.h>

#include <e32std.h>

// Default directory to look for INI file

_LIT(KIniFileDir,"Z:\\System\\Data\\");

// Constant Value changed for DEF047130 fix

const TInt KTokenSize = 256;

enum TIniPanic

	{

	ESectionNameTooBig,

	EKeyNameTooBig,

	};

//

void Panic(TIniPanic aPanic)

	{

	_LIT(CIniData,"CIniData");

	User::Panic(CIniData,aPanic);

	}

/**

Constructor

*/

CIniData::CIniData() : iPtr(NULL,0)

	{

	__DECLARE_NAME(_S("CIniData"));

	}

/**

Destructor.

Frees the resources located in second-phase constructor

*/

CIniData::~CIniData()

	{

	delete (TText*)iPtr.Ptr();

	delete iToken;

	delete iName;

	}

/**

 Creates, and returns a pointer to CIniData object, leave on failure

 @param aName the name of the file which contains the ini data

 @param aDelimeter	Delimiter used in wsini.ini file between variable and value

 @return A pointer to the CiniData object

*/

CIniData* CIniData::NewL(const TDesC& aName, char aDelimiter)

	{

	CIniData* p = new(ELeave) CIniData;

	CleanupStack::PushL(p);

	p->ConstructL(aName, aDelimiter);

	CleanupStack::Pop();

	return p;

	}

/**

 Second-phase constructor.

 The function attempts to allocate a buffer and Read file's contents into iPtr

 @param aName the name of the file which contains the ini data

 @param aDelimeter	Delimiter used in wsini.ini file between variable and value

 @leave One of the system-wide error codes

*/

void CIniData::ConstructL(const TDesC& aName, char aDelimiter)

	{

	//Set delimiter

	iDelimiter = aDelimiter;

 	// Allocate space for token

	iToken=HBufC::NewL(KTokenSize+2);	// 2 extra chars for [tokenName]

	// Connect to file server

	TAutoClose<RFs> fs;

	User::LeaveIfError(fs.iObj.Connect());

	fs.PushL();

	// Find file, given name

	TFindFile ff(fs.iObj);

	User::LeaveIfError(ff.FindByDir(aName, KIniFileDir));

	iName = ff.File().AllocL();

	// Open file

	TAutoClose<RFile> file;

	TInt size;

	User::LeaveIfError(file.iObj.Open(fs.iObj,*iName,EFileStreamText|EFileShareReadersOrWriters));

	file.PushL();

	// Get file size and read in

	User::LeaveIfError(file.iObj.Size(size));

	TText* data = (TText*)User::AllocL(size);

	iPtr.Set(data, size/sizeof(TText), size/sizeof(TText));

	TPtr8 dest((TUint8*)data, 0, size);

	User::LeaveIfError(file.iObj.Read(dest));

	TUint8* ptr = (TUint8*)data;

	//

	// This is orderred as FEFF assuming the processor is Little Endian

	// The data in the file is FFFE.		PRR 28/9/98

	//

	if(size>=(TInt)sizeof(TText) && iPtr[0]==0xFEFF)

	{

		// UNICODE Text file so lose the FFFE

		Mem::Copy(ptr, ptr+sizeof(TText), size-sizeof(TText));

		iPtr.Set(data, size/sizeof(TText)-1, size/sizeof(TText)-1);

	}

	else if(size)

	{

		// NON-UNICODE so convert to UNICODE

		TText* newdata = (TText*)User::AllocL(size*sizeof(TText));

		iPtr.Set(newdata, size, size);

		TInt i;

		for(i = 0 ; i<size ; ++i)

			iPtr[i] = ptr[i];

		delete data;

	}

	file.Pop();

	fs.Pop();

}

/**

Find a text value from given aKeyName regardless the section in the ini data file

@param aKeyName Key being searched for

@param aResult On return, contains the text result 

@return ETrue if found, otherwise EFalse

*/

TBool CIniData::FindVar(const TDesC& aKeyName, TPtrC& aResult)

	{

	// Call with no section, so starts at beginning

	if (FindVar((TDesC&)KNullDesC , aKeyName, aResult))

		return(ETrue);

	else

		return(EFalse);

	}

/**

Find a text value from given aKeyName and aSecName in the ini data file

@param aSectName Section containing key

@param aKeyName Key being searched for in aSectName

@param aResult On return, contains the text result 

@return ETrue if found, otherwise EFalse

*/

TBool CIniData::FindVar(const TDesC& aSectName,const TDesC& aKeyName,TPtrC& aResult)

	{

	__ASSERT_DEBUG(aSectName.Length()<=KTokenSize,Panic(ESectionNameTooBig));

	__ASSERT_DEBUG(aKeyName.Length()<=KTokenSize,Panic(EKeyNameTooBig));

	TInt posStartOfSection(0);

	TInt posEndOfSection(iPtr.Length()); // Default to the entire length of the ini data

	TPtrC SearchBuf;

	// If we have a section, set pos to section start

	TInt posI(0);	// Position in internal data Buffer

	if( aSectName.Length() > 0 )

		{

		TBool FoundSection(false);

		while ( ! FoundSection )

			{

			// Move search buffer to next area of interest

			SearchBuf.Set(iPtr.Mid(posI));

			// Make up token "[SECTIONNAME]", to search for

			TPtr sectionToken = iToken->Des();

			_LIT(sectionTokenFmtString,"[%S]");

			sectionToken.Format(sectionTokenFmtString,&aSectName);

			// Search for next occurrence of aSectName

			TInt posSB = SearchBuf.Find(sectionToken);

			if (posSB == KErrNotFound)

				return(EFalse);

			// Check this is at beginning of line (ie. non-commented)

			// ie. Check preceding char was LF

			if(posSB>0)

				{

				// Create a Buffer, starting one char before found subBuf

				TPtrC CharBefore(SearchBuf.Right(SearchBuf.Length()-posSB+1));

				// Check first char is end of prev

				if(CharBefore[0] == '\n')

					{

					FoundSection = ETrue;		// found

					posI = posI + posSB;

					}

				else

					{

					posI = posI + posSB + 1;	// try again

					}

				}

			else

				{

				FoundSection = ETrue;

				}

			}	// while ( ! FoundSection ) 

		// Set start of section, after section name, (incl '[' and ']')

		posStartOfSection = posI + aSectName.Length() + 2;

		// Set end of section, by finding begin of next section or end

		SearchBuf.Set(iPtr.Mid(posI));

		_LIT(nextSectionBuf,"\n[");

		TInt posSB = SearchBuf.Find(nextSectionBuf);

		if(posSB != KErrNotFound)

			{

			posEndOfSection = posI + posSB;

			}

		else

			{

			posEndOfSection = iPtr.Length();

			}

		}	// if( aSectName.Length() > 0 )

	// Look for key in ini file data Buffer

	posI = posStartOfSection;

	TBool FoundKey(false);

	while ( ! FoundKey )

		{

		// Search for next occurrence of aKeyName

		SearchBuf.Set(iPtr.Mid(posI,posEndOfSection-posI));

		TInt posSB = SearchBuf.Find(aKeyName);

		// If not found, return

		if (posSB == KErrNotFound)

			return(EFalse);

		// Check this is at beginning of line (ie. non-commented)

		// ie. Check preceding char was CR or LF

		if(posSB>0)

			{

			// Create a Buffer, starting one char before found subBuf

			TPtrC CharBefore(SearchBuf.Right(SearchBuf.Length()-posSB+1));

			// Check if the first char is end of prev and also check 

			// if the token found is not a substring of another string  

			TBool beginningOK = ((CharBefore[0] == '\n') || (CharBefore[0] == ' ') || (CharBefore[0] == '\t'));

			TBool endingOK = ((CharBefore[aKeyName.Length()+1] == iDelimiter) || (CharBefore[aKeyName.Length()+1] == ' ') || (CharBefore[aKeyName.Length()+1] == '\t'));

			if (beginningOK && endingOK)

				{

				FoundKey = ETrue;

				posI = posI + posSB;

				}

			else

				{

				posI = posI + posSB + 1;

				}

			}

		else

			{

			FoundKey = ETrue;

			}

		}	// while ( ! FoundKey )

	// Set pos, to just after iDelimiter sign

	SearchBuf.Set(iPtr.Mid(posI));

	TInt posSB = SearchBuf.Locate(iDelimiter);

	if(posSB==KErrNotFound)		// Illegal format, should flag this...

		return(EFalse);

	// Identify start and end of data (EOL or EOF)

	posI = posI + posSB + 1;	// 1 char after iDelimiter

	TInt posValStart = posI;

	TInt posValEnd;

	SearchBuf.Set(iPtr.Mid(posI));

	posSB = SearchBuf.Locate('\r');

	if(posSB != KErrNotFound)

		{

		posValEnd = posI + posSB;

		}

	else

		{

		posValEnd = iPtr.Length();

		}

	// Check we are still in the section requested

	if( aSectName.Length() > 0 )

		{

		if( posValEnd > posEndOfSection )

			{

			return(EFalse);

			}

		}

	// Parse Buffer from posn of key

	// Start one space after '='

	TLex lex(iPtr.Mid(posValStart, posValEnd-posValStart));

	lex.SkipSpaceAndMark();		// Should be at the start of the data

	aResult.Set(lex.MarkedToken().Ptr(),posValEnd-posValStart - lex.Offset() );

	return(ETrue);

	}

/**

Find an integer value from given aKeyName regardless the section in the ini data file

@param aKeyName Key being searched for

@param aResult On return, contains the TInt result 

@return ETrue if found, otherwise EFalse

*/

TBool CIniData::FindVar(const TDesC& aKeyName, TInt& aResult)

	{

	TPtrC ptr(NULL,0);

	if (FindVar(aKeyName,ptr))

		{

		TLex lex(ptr);

		if (lex.Val(aResult) == KErrNone)

			return(ETrue);

		}

	return(EFalse);

	}

/**

Find an integer value from given aKeyName and aSecName in the ini data file

@param aSectName Section containing key

@param aKeyName Key being searched for  in aSectName

@param aResult On return, contains TInt result 

@return ETrue if found, otherwise EFalse

*/

TBool CIniData::FindVar(const TDesC& aSection,const TDesC& aKeyName,TInt& aResult)

	{

	TPtrC ptr(NULL,0);

	if (FindVar(aSection,aKeyName,ptr))

		{

		TLex lex(ptr);

		if (lex.Val(aResult) == KErrNone)

			return(ETrue);

		}

	return(EFalse);

}