--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/smartinstaller/common/config.cpp	Fri Feb 19 15:03:34 2010 +0530
@@ -0,0 +1,239 @@
+/*
+* Copyright (c) 2009-2010 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: 
+*     Implementation to read from the config file.
+*
+*
+*/
+
+
+#include "config.h"
+
+// ---------------------------------------------------------------------------
+// ReadConfigFile
+//
+// Reads the configuration file to aBuffer, aLineBuffer containing the pointers to lines.
+//
+// @return TInt normal Symbian error code or KErrNone if all went OK.
+// ---------------------------------------------------------------------------
+//
+TInt ReadConfigFile(RFile& aFile, TDes& aBuffer, RArray< TPtrC >& aLineBuffer )
+	{
+	// Read text file into buffers
+	TInt ret( KErrNone );
+	TFileText tf;
+	tf.Set( aFile );
+	aBuffer.SetMax();
+	TPtr ptr( aBuffer.MidTPtr( 0 ) );
+	TInt used( 0 );
+	do
+		{
+		ret = tf.Read( ptr );
+		TInt len( ptr.Length() );
+		if ( ( ret == KErrNone || ret == KErrEof ) && len > 0 )
+			{
+			// Store non-empty text line
+			TInt err( aLineBuffer.Append( ptr ) );
+			if ( err == KErrNone )
+				{
+				ptr.SetMax();
+				ptr.Set( ptr.MidTPtr( len ) );
+				ptr.Zero();
+				used += len;
+				}
+			else
+				{
+				ret = err;
+				}
+			}
+		}
+	while ( ret == KErrNone );
+	if ( ret == KErrEof )
+		{
+		// reached the end of file without any other error => this is OK
+		ret = KErrNone;
+		}
+	aBuffer.SetLength( used );
+
+	return ret;
+	}
+
+// ---------------------------------------------------------------------------
+// ReadConfigFile
+//
+// @return HBufC containg the read config file. aLineBuffer arrays pointing to lines.
+// ---------------------------------------------------------------------------
+//
+HBufC* ReadConfigFile( RFs& aFs, const TDesC& aFullPath, RArray< TPtrC >& aLineBuffer, TInt& aError )
+	{
+	RFile file;
+	aError = file.Open( aFs, aFullPath, EFileRead | EFileStreamText | EFileShareReadersOnly );
+	if ( aError != KErrNone )
+		{
+		return NULL;
+		}
+	TInt size( 0 );
+	aError = file.Size( size );
+	if ( aError != KErrNone )
+		{
+		file.Close();
+		return NULL;
+		}
+	// Get text size, create buffer for text and read text file
+	HBufC* ret = HBufC::New( ( size + sizeof( TText ) - 1 ) / sizeof( TText ) );
+	if ( !ret )
+		{
+		aError = KErrNoMemory;
+		file.Close();
+		return NULL;
+		}
+	TPtr ptr( ret->Des() );
+	aError = ReadConfigFile( file, ptr, aLineBuffer );
+	file.Close();
+	if ( aError != KErrNone )
+		{
+		delete ret;
+		aLineBuffer.Reset();
+		return NULL;
+		}
+	return ret;
+	}
+
+// ---------------------------------------------------------------------------
+// GetConfigValue
+//
+// Gets string specified by tag. For examples:
+// Tag1=Value1  Tag1 = aTag, Value1 will be copied to aTag
+// aError Normal Symbian error code or KErrNone if all went OK.
+// ---------------------------------------------------------------------------
+//
+TPtrC GetConfigValue( const TDesC& aTag, const RArray< TPtrC >& aLineBuffer, TInt& aError )
+	{
+	aError = KErrNotFound;
+	TPtrC ret( KNullDesC );
+	const TInt tagLen( aTag.Length() );
+	const TInt count( aLineBuffer.Count() );
+	for( TInt i( 0 ); i < count; ++i )
+		{
+		TPtrC line( aLineBuffer[ i ] );
+		if ( !line.Left( tagLen ).CompareF( aTag ) )
+			{
+			ret.Set( line.Mid( tagLen ) );
+			aError = KErrNone;
+			break;
+			}
+		}
+
+	return ret;
+	}
+
+TInt CompareVersions(TVersion& version1,TVersion& version2)
+	{
+	// Compare the versions based on major,minor and build number.
+	if((version1.iMajor == version2.iMajor)&&(version1.iMinor == version2.iMinor)&&(version1.iBuild == version2.iBuild))
+		{
+		return EEqualVersion;
+		}
+	else if ((version1.iMajor > version2.iMajor) ||
+			((version1.iMajor == version2.iMajor)&&(version1.iMinor > version2.iMinor)) ||
+			((version1.iMajor == version2.iMajor)&&(version1.iMinor == version2.iMinor)&&(version1.iBuild >= version2.iBuild)))
+		{
+		return EGreaterFirstVersion;
+		}
+	else
+		{
+		return EGreaterSecondVersion;
+		}
+	}
+
+TBool SetVersion(const TDesC8& aVersionPtr, TVersion& aVer)
+	{
+	// Function will return EFalse if aVersionPtr is not a valid
+	// version string
+	TLex8 lex(aVersionPtr);
+	TInt count = 0;
+	lex.SkipSpace();
+
+	// Get Major Version (max length 3)
+	const TInt maxMajorVersionLength = 3;
+	lex.Mark();
+	while ( (count<maxMajorVersionLength) && (lex.Peek() != '.') )
+		{
+		lex.Inc();
+		++count;
+		}
+
+	if (!(lex.Peek() == '.'))
+		{
+		return EFalse;
+		}
+
+	TLex8 lexToken(lex.MarkedToken());
+	if ( lexToken.Val(aVer.iMajor) != KErrNone )
+		{
+		return EFalse;
+		}
+
+	// Get Minor Version(max length 2)
+	const TInt maxMinorVersionLength = 2;
+	count = 0;
+	lex.Inc();
+	lex.Mark();
+	while ( (count<maxMinorVersionLength) && (lex.Peek() != '.') )
+		{
+		lex.Inc();
+		++count;
+		}
+
+	lexToken.Assign(lex.MarkedToken());
+	if ( lexToken.Val(aVer.iMinor) != KErrNone )
+		{
+		return EFalse;
+		}
+
+	// Check if Build Number exists,
+	// otherwise return
+	if (!(lex.Peek() == '.'))
+	   {
+	   lex.Mark();
+	   lex.SkipCharacters();
+	   if (lex.TokenLength() > 0)
+		   {
+		   return EFalse;
+		   }
+	   else
+		   {
+		   aVer.iBuild = 0;
+		   return ETrue;
+		   }
+	   }
+
+	// Get Build Number(max length 5)
+	const TInt maxBuildNoLength = 5;
+	lex.Inc();
+	lex.Mark();
+	lex.SkipCharacters();
+
+	if (lex.TokenLength() > maxBuildNoLength)
+		{
+		return EFalse;
+		}
+
+	lexToken.Assign(lex.MarkedToken());
+	if ( lexToken.Val(aVer.iBuild) != KErrNone )
+		{
+		return EFalse;
+		}
+	return ETrue;
+	}