/*

* Copyright (c) 2008-2009 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: 

*

*/

/**

 @file 

 @released

 @internalTechnology

*/

#include "operationfunctions.h"

#include "integritytree.h"

namespace Usif

{

void VerifyDeletionErrorL(TInt err)

	{

	if (err != KErrNone && err != KErrNotFound && err != KErrPathNotFound)

		User::Leave(err);

	}

void IntegrityDeleteFileL(const TDesC& aPath, CIntegrityTreeLeaf* aLeaf, RFs& aFs, 

							   RLoader& aLoader, CFileMan& aFileMan)

	{

	RBuf name;

	name.CreateL(aPath, KMaxFileName);

	CleanupClosePushL(name);

	name.Append(aLeaf->Name());

	TEntry entry;

	TInt err = aFs.Entry(name, entry);

	if (err == KErrNone)

		{

		aFs.SetAtt(name, 0, KEntryAttReadOnly);

		if(entry.IsDir())

			{

			// Make sure to append slash before calling RmDir - otherwise it deletes the parent directory			

			if (name[name.Length()-1] != KPathDelimiter) 

	  			{

  				name.Append(KPathDelimiter);

  				}

			User::LeaveIfError(aFileMan.RmDir(name));

			}

		else

			{

			User::LeaveIfError(aLoader.Delete(name));

			}

		// prune the directory tree if possible

		RemoveDirectoryTreeL(aFs, name);

		}

	else

		{

		VerifyDeletionErrorL(err);

		}

	CleanupStack::PopAndDestroy(&name);

	}

void IntegrityRestoreFileL(const TDesC& aPath, CIntegrityTreeLeaf* aLeaf, RFs& aFs, 

								RLoader& /*aLoader*/, CFileMan& /*aFileMan*/)

	{

	RBuf name;

	name.CreateL(aPath, KMaxFileName);

	CleanupClosePushL(name);

	name.Append(aLeaf->Name());

	// find the peer file, and check it's a backup.

	CIntegrityTreeLeaf* peer = aLeaf->Peer();

	if (peer->Type() != EBackupFile)

		{

		User::Leave(KErrCorrupt);

		}

	TParsePtrC parse(peer->Journal());

	RBuf backup;

	backup.CreateL(parse.DriveAndPath(), KMaxFileName);

	CleanupClosePushL(backup);

	backup.Append(parse.Name());

	backup.Append(KPathDelimiter);

	backup.Append(peer->Name());

	TInt err = aFs.MkDirAll(name);

	if(err != KErrNone && err != KErrAlreadyExists)

		{

		User::Leave(err);

		}

	err = aFs.Rename(backup, name);

	if (err != KErrNone)

		{

		VerifyDeletionErrorL(err);

		// we may have already moved it back during a previous recovery

		// attempt, check for its presence in the original location

		TEntry restoredEntry;

		User::LeaveIfError(aFs.Entry(name, restoredEntry));

		}

	else

		{

		// prune the backup directory tree if possible.

		RemoveDirectoryTreeL(aFs, backup);

		}

	CleanupStack::PopAndDestroy(2, &name);	// backup

	}

void RemoveDirectoryTreeL(RFs& aFs, const TDesC& aFileName)

	{

	TParse directory;

	User::LeaveIfError(directory.SetNoWild(aFileName, NULL, NULL));

	while(!directory.IsRoot())

		{

		// try to remove this directory

		TInt err = aFs.RmDir(directory.DriveAndPath());

		if(err == KErrInUse || err == KErrAccessDenied)

			{

			break;

			}

		VerifyDeletionErrorL(err);		

		// move to deleted directory's parent

		User::LeaveIfError(directory.PopDir());

		}	

	}

} // end namespace Usif