/*

* 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);

	};