/*

* Copyright (c) 2009 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:

*

*/

using System;

using System.Collections.Generic;

using System.Text;

using System.IO;

using SymbianUtils.Tracer;

using SymbianUtils.Streams;

using SymbianStructuresLib.Uids;

using SymbianStructuresLib.Compression.Common;

using SymbianImageLib.Common.Header;

using SymbianImageLib.Common.Image;

using SymbianImageLib.Common.Streams;

using SymbianImageLib.E32Image.Content;

using SymbianImageLib.E32Image.Header;

using SymbianImageLib.E32Image.Exceptions;

namespace SymbianImageLib.E32Image.Image

{

    public class SymbianImageE32 : SIImage

    {

        #region Constructors

        public SymbianImageE32( FileInfo aFileInfo, ITracer aTracer )

            : this( aFileInfo.FullName, (uint) aFileInfo.Length, 0, new SIStream( aFileInfo.OpenRead() ), aTracer )

        {

        }

        internal SymbianImageE32( string aImageName, uint aImageContentSize, long aImageContentOffset, SIStream aStream, ITracer aTracer )

            : base( aTracer, aStream, aImageName )

        {

            iContentOffsetWithinDataStream = aImageContentOffset;

            //

            using ( SymbianStreamReaderLE reader = base.Stream.CreateReader() )

            {

                reader.Seek( iContentOffsetWithinDataStream );

                iHeader = new SIHeaderE32Image( this, reader );

            }

            // Since we are a single e32 image, we have a single e32 Image file descriptor

            SIContentE32Image file = new SIContentE32Image( this, aImageName, aImageContentSize, aImageContentOffset );

            base.RegisterFile( file );

        }

        #endregion

        #region From SIImage

        public override SIHeader Header

        {

            get { return iHeader; }

        }

        #endregion

        #region API

        public static bool IsImageFile( Stream aStream )

        {

            return IsImageFile( aStream, aStream.Position );

        }

        public static bool IsImageFile( Stream aStream, long aPosition )

        {

            bool ret = false;

            //

            try

            {

                using ( SymbianStreamReaderLE reader = SymbianStreamReaderLE.New( aStream, SymbianStreamReaderLE.TCloseOperation.EResetPosition ) )

                {

                    aStream.Seek( aPosition, SeekOrigin.Begin );

                    //

                    byte[] bytes = reader.ReadBytes( SIHeaderE32Image.KMinimumSize );

                    ret = SIHeaderE32Image.IsSymbianImageHeader( bytes );

                }

            }

            catch ( Exception )

            {

            }

            return ret;

        }

        #endregion

        #region Properties

        internal TCheckedUid Uid

        {

            get

            {

                return iHeader.Uid;

            }

        }

        internal long ContentOffsetWithinDataStream

        {

            get { return iContentOffsetWithinDataStream; }

        }

        #endregion

        #region Internal methods

        #endregion

        #region Data members

        private readonly SIHeaderE32Image iHeader;

        private readonly long iContentOffsetWithinDataStream;

        #endregion

    }

}