/*

 * Copyright (c) 1998-2009 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: 

 *

 */

 #include <s32file.h>

 #include "t_utils.h"

 const TInt KBufferSize = 1024;

 EXPORT_C TBool Utils::CompareFileL(const TDesC& aFileName1, const TDesC& aFileName2, TInt &aError)

 	{

 	RFile file1, file2;

 	RFs fs;

 	TInt err1, err2, size1, size2;

 	TBool success = EFalse;

 	// checks files are different

 	if(aFileName1 == aFileName2)

 		{

 		aError = KErrNotFound;

 		return(EFalse);

 		};

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

 	CleanupClosePushL(fs);

 	// opens first file

 	err1 = file1.Open(fs, aFileName1, EFileRead);

 	if (err1 != KErrNone)

 		{

 		CleanupStack::PopAndDestroy(); // fs

 		aError = KErrNotFound;

 		return(EFalse);

 		}

 	CleanupClosePushL(file1);

 	//opens second file

 	err2 = file2.Open(fs, aFileName2, EFileRead);

 	if (err2 != KErrNone)

 		{

 		CleanupStack::PopAndDestroy(2); // fs, file1

 		aError = KErrNotFound;

 		return(EFalse);

 		}

 	CleanupClosePushL(file2);

 	TBool finished = EFalse;

 	HBufC8 *fileBuf1 = HBufC8::NewLC(KBufferSize);

 	HBufC8 *fileBuf2 = HBufC8::NewLC(KBufferSize);

 	TPtr8 filePtr1(fileBuf1->Des());

 	TPtr8 filePtr2(fileBuf2->Des());

 	file1.Size(size1);

 	file2.Size(size2);

 	// compares size, no need to do any more checking if they are different

 	if(size1 == size2)

 		{

 		success = ETrue;

 		do

 			{

 			// reads in buffer from each file

 			// cannot rely on max length of descriptor so pass in size of 

 			// buffer to read

 			err1 = file1.Read(filePtr1,KBufferSize);

 			err2 = file2.Read(filePtr2,KBufferSize);

 			// checks if an error has occured

 			if(err1 != KErrNone && err2 != KErrNone)

 				{

 				finished = ETrue;

 				success = EFalse;

 				};

 			// executes a binary compare

 			if(fileBuf1->Compare(*fileBuf2)!=0)

 				{

 				// binary compare failed, file are different

 				finished = ETrue;

 				success = EFalse;

 				};

 			// checks for EOF

 			if(fileBuf1->Length() != KBufferSize)

 				finished = ETrue;

 			}

 		while(!finished);

 		};

 	CleanupStack::PopAndDestroy(5); // fs, file1, file2, fileBuf1, fileBuf2

 	return(success);

 	};