kwqfile.cpp

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/*
 * Copyright (C) 2003 Apple Computer, Inc.  All rights reserved.
 * Portions Copyright (c) 2005 Nokia Corporation, Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "KWQFile.h"
#include "KWQGlobalServices.h"
#include <f32file.h>
#include <bautils.h>

// QFilePrivate
class QFilePrivate
OOM_MODIFIED
	{
	public:
		QFilePrivate();
		~QFilePrivate();

		TInt Open( const TDesC& aName, TInt aMode );
		void Close();

		TInt Read( TInt aPos, TDes8& aDes ) const;
		TBool isOpened() const			{ return iOpened; }
		TInt Size();

	private:
		RFile 	iFile;
		TBool 	iOpened;

		// quick access for QFile
		friend class QFile;
	};

QFilePrivate::QFilePrivate() : iOpened( EFalse )
	{
	}

QFilePrivate::~QFilePrivate()
	{
	if( iOpened )
		iFile.Close();
	}

TInt QFilePrivate::Open( const TDesC& aName, TInt aMode )
	{
	TInt err = iFile.Open( KWQGlobalServices::InstanceL()->FileSession(), aName, aMode );
	iOpened = ( err == KErrNone );
	return err;
	}

void QFilePrivate::Close()
	{
	if( iOpened ) iFile.Close();
	}

TInt QFilePrivate::Read( TInt aPos, TDes8& aDes ) const
	{
		if( iOpened )
		{
			iFile.Lock( aPos, aDes.MaxLength() );
			TInt err = iFile.Read( aPos, aDes );
			iFile.UnLock( aPos, aDes.MaxLength() );
			return err == KErrNone ? aDes.Length() : -1 ;
		}
		else
			return -1;
	}

// QFile
QFile::QFile(const QString &n) : iName( n ), iPrivate(0)
{
	iPrivate = new QFilePrivate;
}

QFile::~QFile()
{
    delete iPrivate;
}

bool QFile::exists() const
{
	return BaflUtils::FileExists( KWQGlobalServices::InstanceL()->FileSession(), iName.Des() );
}

bool QFile::open(int mode)
{
	if( mode == IO_ReadOnly )
		{
		if( !iPrivate->isOpened() )
			iPrivate->Open( iName.Des(), EFileShareReadersOnly );

		return iPrivate->isOpened();
		}

	return false;
}

void QFile::close()
{
	iPrivate->Close();
}

int QFile::readBlock(char *data, uint bytesToRead)
{
	// Apple's code only assumes reading file from the begining
	TPtr8 ptr( (unsigned char*)data, 0, bytesToRead );
	return iPrivate->Read( 0, ptr );
}

uint QFile::size() const
{
	if( !iPrivate->isOpened() )
		iPrivate->Open( iName.Des(), EFileShareReadersOnly );

	if( iPrivate->isOpened() )
		{
		TInt sz;
		iPrivate->iFile.Size( sz );
		return sz;
		}
	else
		return 0;
}

bool QFile::exists(const QString &path)
{
    return QFile(path).exists();
}