/*

* Copyright (c) 2002 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: 

*     Implements character converter for application.

*

*/

// INCLUDE FILES

#include <bldvariant.hrh>

#include <eikenv.h>

#include <miutconv.h>

#ifdef SYMBIAN_ENABLE_SPLIT_HEADERS  

#include <cimconvertcharconv.h>

#endif

#include "MsgMailViewerCharConv.h"

// CONSTANTS

const TInt KBlockSize = 64;

// ================= MEMBER FUNCTIONS =======================

// Default constructor

CMsgMailViewerCharConv::CMsgMailViewerCharConv()

: iState( CCnvCharacterSetConverter::KStateDefault )

    { 

    }

// destructor

CMsgMailViewerCharConv::~CMsgMailViewerCharConv()

    {

    delete iCharConv;

    delete iImCharConv;

    delete iTarget8;

    delete iTarget16;

    }

// Symbian OS default constructor can leave.

void CMsgMailViewerCharConv::ConstructL( TUint aCharSet )

    {

    if (aCharSet > 0)

        {

        iCharConv = CCnvCharacterSetConverter::NewL();

        iImCharConv = CImConvertCharconv::NewL(

            *iCharConv, CEikonEnv::Static()->FsSession());			// CSI: 27 # Must be used because of iEikEnv 

																	// is not accessible.

        TBool found = iImCharConv->PrepareToConvertToFromOurCharsetL(aCharSet);

        if (!found)

            {

            User::Leave( KErrNotFound );

            }

        }

    }

// Two-phased constructor.

CMsgMailViewerCharConv* CMsgMailViewerCharConv::NewL(

        TUint aCharSet )     // CMsgMailViewerApp reference

    {

    CMsgMailViewerCharConv* self = new (ELeave) CMsgMailViewerCharConv();

    CleanupStack::PushL( self );

    self->ConstructL( aCharSet );

    CleanupStack::Pop();

    return self;

    }

void CMsgMailViewerCharConv::PrepareToConvertFromUnicodeL( const TDesC16& aSource )

    {

    iSource16.Set( aSource );

    delete iTarget8;

    iTarget8 = NULL;

    iTarget8 = HBufC8::NewL( iSource16.Length()*2 );		// CSI: 47 # For conversion.

    iFromUnicode = ETrue;

    iFailCount = 0;

    }

void CMsgMailViewerCharConv::PrepareToConvertToUnicodeL( const TDesC8& aSource )

    {

    iSource8.Set( aSource );

    delete iTarget16;

    iTarget16 = NULL;

    iTarget16 = HBufC16::NewL( iSource8.Length() );

    iFromUnicode = EFalse;

    }

HBufC16* CMsgMailViewerCharConv::GetUnicodeText()

    {

    HBufC16* result = iTarget16;

    iTarget16 = NULL;

    return result;

    }

HBufC8* CMsgMailViewerCharConv::GetForeignText()

    {

    HBufC8* result = iTarget8;

    iTarget8 = NULL;

    return result;

    }

TInt CMsgMailViewerCharConv::GetFailedCount() const

    {

    return iFailCount;

    }

void CMsgMailViewerCharConv::AppendTextL( const TDesC16& aData )

    {

    TPtr target( iTarget16->Des() );

    TInt length = target.Length() + aData.Length();

    if( length > target.MaxLength() )

        {

        iTarget16 = iTarget16->ReAllocL( length );

        target.Set( iTarget16->Des() );

        }

    target.Append( aData );

    }

void CMsgMailViewerCharConv::AppendTextL( const TDesC8& aData )

    {

    TPtr8 target( iTarget8->Des() );

    TInt length = target.Length() + aData.Length();

    if( length > target.MaxLength() )

        {

        iTarget8 = iTarget8->ReAllocL( length );

        target.Set( iTarget8->Des() );

        }

    target.Append( aData );

    }

void CMsgMailViewerCharConv::StepL()

    {

    if( iFromUnicode )

        {

        StepFromUnicodeL();

        }

    else

        {

        StepToUnicodeL();

        }

    }

void CMsgMailViewerCharConv::StepFromUnicodeL()

    {

    if (iImCharConv)

        {

        TBuf8<KBlockSize> buf;

        TInt firstUnconvertdChar;

        TInt numUnconvertedChars;

        TInt length (iImCharConv->ConvertFromOurCharsetL( iSource16, buf, 

            numUnconvertedChars, 

            firstUnconvertdChar));

        iFailCount += numUnconvertedChars;

        User::LeaveIfError( length );

        iSource16.Set( iSource16.Right( length ) );

        AppendTextL( buf );

        }

    else

        {

        // No converter, just copy source to target

        iTarget8->Des().Copy(iSource16);

        iSource16.Set( KNullDesC() );

        }

    }

void CMsgMailViewerCharConv::StepToUnicodeL()

    {

    if (iImCharConv)

        {

        TBuf16<KBlockSize> buf;

        TInt firstUnconvertdChar;

        TInt numUnconvertedChars;

        TInt length (iImCharConv->ConvertToOurCharsetL( iSource8, buf, 

            numUnconvertedChars, 

            firstUnconvertdChar));

        User::LeaveIfError( length );

        iSource8.Set( iSource8.Right( length ) );

        AppendTextL( buf );

        }

    else

        {

        // just copy source to target

        iTarget16->Des().Copy(iSource8);

        iSource8.Set( KNullDesC8() );

        }

    }

TBool CMsgMailViewerCharConv::IsProcessDone() const

    {

    TBool ret( EFalse );

    if( iFromUnicode )

        {

        ret = iSource16.Length() == 0;

        }

    else

        {

        ret = iSource8.Length() == 0;

        }

    return ret;

    }

// End of File