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 System.Runtime.InteropServices;

    22 using SymbianStructuresLib.Compression.Common;

    23 

    24 namespace SymbianStructuresLib.Compression.BytePair

    25 {

    26     public class SymbianDecompressorBytePair : SymbianDecompressor

    27     {

    28         #region Constructors

    29         public SymbianDecompressorBytePair()

    30         {

    31         }

    32         #endregion

    33 

    34         #region From SymbianDecompressor

    35         public override TSymbianCompressionType Type

    36         {

    37             get { return TSymbianCompressionType.EBytePair; }

    38         }

    39 

    40         protected override int DoDecompressRaw( IntPtr aSource, int aSourceLength, IntPtr aDestination, int aDestinationLength )

    41  	    {

    42             int ret = SymbianBytePairUnpackRaw( aSource, aSourceLength, aDestination, aDestinationLength );

    43             return ret;

    44         }

    45 

    46         protected override int DoDecompressImage( IntPtr aSource, int aSourceLength, IntPtr aDestination, int aDestinationLength, out int aAmountOfSourceRead )

    47         {

    48             int ret = 0;

    49             aAmountOfSourceRead = 0;

    50             IntPtr pAmountSrcRead = Marshal.AllocHGlobal( 4 );

    51             //

    52             try

    53             {

    54                 ret = SymbianBytePairUnpackImage( aSource, aSourceLength, aDestination, aDestinationLength, pAmountSrcRead );

    55                 aAmountOfSourceRead = (int) Marshal.PtrToStructure( pAmountSrcRead, typeof( Int32 ) );

    56             }

    57             finally

    58             {

    59                 Marshal.FreeHGlobal( pAmountSrcRead );

    60             }

    61             //

    62             return ret;

    63         }

    64         #endregion

    65 

    66         #region Properties

    67         #endregion

    68 

    69         #region Native methods

    70         [DllImport("SymbianNativeTools.dll")]

    71         public static extern int SymbianBytePairUnpackRaw( IntPtr aSource, int aSourceSize, IntPtr aDest, int aDestSize );

    72         [DllImport("SymbianNativeTools.dll")]

    73         public static extern int SymbianBytePairUnpackImage( IntPtr aSource, 

    74                                                              int aSourceSize, 

    75                                                              IntPtr aDest, 

    76                                                              int aDestSize, 

    77                                                              IntPtr aAmountOfSourceRead );

    78         #endregion

    79 

    80         #region Data members

    81         #endregion

    82     }

    83 }