1 /*

     2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 * 

    14 * Description:

    15 *

    16 */

    17 using System;

    18 using System.Collections.Generic;

    19 using System.Text;

    20 using System.IO;

    21 using SymbianUtils.Tracer;

    22 using SymbianUtils.Streams;

    23 using SymbianStructuresLib.Uids;

    24 using SymbianStructuresLib.Compression.Common;

    25 using SymbianImageLib.Common.Header;

    26 using SymbianImageLib.Common.Image;

    27 using SymbianImageLib.Common.Streams;

    28 using SymbianImageLib.E32Image.Content;

    29 using SymbianImageLib.E32Image.Header;

    30 using SymbianImageLib.E32Image.Exceptions;

    31 

    32 namespace SymbianImageLib.E32Image.Image

    33 {

    34     public class SymbianImageE32 : SIImage

    35     {

    36         #region Constructors

    37         public SymbianImageE32( FileInfo aFileInfo, ITracer aTracer )

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

    39         {

    40         }

    41 

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

    43             : base( aTracer, aStream, aImageName )

    44         {

    45             iContentOffsetWithinDataStream = aImageContentOffset;

    46             //

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

    48             {

    49                 reader.Seek( iContentOffsetWithinDataStream );

    50                 iHeader = new SIHeaderE32Image( this, reader );

    51             }

    52 

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

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

    55             base.RegisterFile( file );

    56         }

    57         #endregion

    58 

    59         #region From SIImage

    60         public override SIHeader Header

    61         {

    62             get { return iHeader; }

    63         }

    64         #endregion

    65 

    66         #region API

    67         public static bool IsImageFile( Stream aStream )

    68         {

    69             return IsImageFile( aStream, aStream.Position );

    70         }

    71         

    72         public static bool IsImageFile( Stream aStream, long aPosition )

    73         {

    74             bool ret = false;

    75             //

    76             try

    77             {

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

    79                 {

    80                     aStream.Seek( aPosition, SeekOrigin.Begin );

    81                     //

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

    83                     ret = SIHeaderE32Image.IsSymbianImageHeader( bytes );

    84                 }

    85             }

    86             catch ( Exception )

    87             {

    88             }

    89             return ret;

    90         }

    91         #endregion

    92 

    93         #region Properties

    94         internal TCheckedUid Uid

    95         {

    96             get

    97             {

    98                 return iHeader.Uid;

    99             }

   100         }

   101 

   102         internal long ContentOffsetWithinDataStream

   103         {

   104             get { return iContentOffsetWithinDataStream; }

   105         }

   106         #endregion

   107 

   108         #region Internal methods

   109         #endregion

   110 

   111         #region Data members

   112         private readonly SIHeaderE32Image iHeader;

   113         private readonly long iContentOffsetWithinDataStream;

   114         #endregion

   115     }

   116 }