/*

* 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 System.Runtime.InteropServices;

using SymbianStructuresLib.Compression.Common;

namespace SymbianStructuresLib.Compression.BytePair

{

    public class SymbianDecompressorBytePair : SymbianDecompressor

    {

        #region Constructors

        public SymbianDecompressorBytePair()

        {

        }

        #endregion

        #region From SymbianDecompressor

        public override TSymbianCompressionType Type

        {

            get { return TSymbianCompressionType.EBytePair; }

        }

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

 	    {

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

            return ret;

        }

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

        {

            int ret = 0;

            aAmountOfSourceRead = 0;

            IntPtr pAmountSrcRead = Marshal.AllocHGlobal( 4 );

            //

            try

            {

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

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

            }

            finally

            {

                Marshal.FreeHGlobal( pAmountSrcRead );

            }

            //

            return ret;

        }

        #endregion

        #region Properties

        #endregion

        #region Native methods

        [DllImport("SymbianNativeTools.dll")]

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

        [DllImport("SymbianNativeTools.dll")]

        public static extern int SymbianBytePairUnpackImage( IntPtr aSource, 

                                                             int aSourceSize, 

                                                             IntPtr aDest, 

                                                             int aDestSize, 

                                                             IntPtr aAmountOfSourceRead );

        #endregion

        #region Data members

        #endregion

    }

}