/*

* Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* 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:        This class is a utitlity class for conversion of Vodafone

*                pictograph.

*

*/

// PICTOGRAPH_SHARED.CPP

//

//

#include "CnvPictographShared.h"

// #include "CnvPictograph1.h"

#include "CnvShiftJisDirectmap.h"

#include <convgeneratedcpp.h>

// CONSTANTS

// Escape sequence for Vodafone pictograph

_LIT8(KLit8EscapeSequenceForPictograph, "\x1b\x24");

// _LIT8(KLit8EscapeSequenceForPictograph1, "\x1b\x24\x47");

const TInt KEscape = 0x1B;

const TInt KShiftIn = 0x0F;

// Intermidiate buffers for pictograph

const TInt KIntermediateBuffer1 = 'G';

const TUint KSingleByteRangeFirstBlockStart = 0xF0;

const TUint KSingleByteRangeFirstBlockEnd = 0xF9;

const TUint KSingleByteRangeSecondBlockStart = 0x40;

const TUint KSingleByteRangeSecondBlockEnd = 0xFC;

const TUint KFirstByteRangeFirstBlockStart = 0xF5;

const TUint KFirstByteRangeFirstBlockEnd = 0xFE;

const TUint KSecondByteRangeSecondBlockStart = 0xA1;

const TUint KSecondByteRangeSecondBlockEnd = 0xFE;

const TUint KEUCJPSecondBlockStart = 0xF5;

const TUint KEUCJPBlockSize = 0x5D;

const TUint KSingleShift3=0x8f;

// used for EucJp

const TUint KPictographStartFirstByte = 0xF0;

const TUint KPictographStartSecondByte = 0x40;

const TUint KShiftJisTrailByteIllegal = 0x7F;

// ============================ LOCAL FUNCTIONS ===============================

// -----------------------------------------------------------------------------

// DummyConvertToIntermediateBufferInPlace ?description.

//

// -----------------------------------------------------------------------------

//

LOCAL_C void DummyConvertToIntermediateBufferInPlace(TDes8&)

    {

    }

// -----------------------------------------------------------------------------

// DummyConvertFromIntermediateBufferInPlace

//

// -----------------------------------------------------------------------------

//

LOCAL_C void DummyConvertFromIntermediateBufferInPlace(TInt, TDes8&,

                                TInt& aNumberOfCharactersThatDroppedOut)

    {

    aNumberOfCharactersThatDroppedOut=0;

    }

// -----------------------------------------------------------------------------

// ConvertFromPictogaphToEucJpDirectmapInPlace

// Converts from EucJp packed Pictograph to Unicode

// -----------------------------------------------------------------------------

//

LOCAL_C void ConvertFromPictogaphToEucJpDirectmapInPlace(

        TInt aStartPositionInDescriptor, TDes8& aDescriptor,

        TInt& aNumberOfCharactersThatDroppedOut)

    {

    TInt descriptorLength=aDescriptor.Length();

    TInt bytesPerCharacter = 2;

    if (aDescriptor[0] >= KEUCJPSecondBlockStart)

        {

        bytesPerCharacter = 3;

        }

    aNumberOfCharactersThatDroppedOut =

        Max(0, ((descriptorLength - aStartPositionInDescriptor) / 2) -

        ((aDescriptor.MaxLength() - aStartPositionInDescriptor) /

        bytesPerCharacter));

    descriptorLength -= aNumberOfCharactersThatDroppedOut * 2;

    if (descriptorLength <= aStartPositionInDescriptor)

        {

        aDescriptor.SetLength(descriptorLength);

        }

    else

        {

        // pointerToTargetByte is initialized properly when descriptorLength

        // has been offset to the actual final length of aDescriptor

        TUint8* pointerToTargetByte = CONST_CAST(TUint8*, aDescriptor.Ptr());

        const TUint8* const pointerToFirstByte =

            pointerToTargetByte + aStartPositionInDescriptor;

        const TUint8* pointerToSourceByte =

            pointerToTargetByte + (descriptorLength - 1);

        descriptorLength = (((descriptorLength - aStartPositionInDescriptor)

            * bytesPerCharacter) / 2) + aStartPositionInDescriptor;

        aDescriptor.SetLength(descriptorLength);

        // pointerToTargetByte is is initialized properly here

        pointerToTargetByte += descriptorLength - 1;

        for (;pointerToTargetByte > pointerToFirstByte; )

            {

            TInt secondByte = *pointerToSourceByte;

            TInt firstByte = *(pointerToSourceByte - 1);

            if (bytesPerCharacter == 3)

                {

                firstByte = (firstByte - KEUCJPSecondBlockStart) * 2 +

                    KFirstByteRangeFirstBlockStart;

                }

            else

                {

                firstByte = (firstByte - KPictographStartFirstByte) * 2 +

                    KFirstByteRangeFirstBlockStart;

                }

            if (static_cast<TInt>(KEUCJPBlockSize + KPictographStartSecondByte + 1)

                 < secondByte)

                {

                if (secondByte > KShiftJisTrailByteIllegal)

                    secondByte -= 1;

                secondByte = secondByte -(KPictographStartSecondByte +

                    KEUCJPBlockSize + 1) + KSecondByteRangeSecondBlockStart;

                firstByte++;

                }

            else

                {

                if (secondByte > KShiftJisTrailByteIllegal)

                    secondByte -= 1;

                secondByte += KSecondByteRangeSecondBlockStart - KPictographStartSecondByte;

                }

            *pointerToTargetByte = static_cast<TUint8>(secondByte);

            --pointerToTargetByte;

            *pointerToTargetByte = static_cast<TUint8>(firstByte);

            if (bytesPerCharacter == 3)

                {

                --pointerToTargetByte;

                *pointerToTargetByte = KSingleShift3;

                }

            --pointerToTargetByte;

            pointerToSourceByte -= 2;

            }

        }

    }

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

// -----------------------------------------------------------------------------

// CnvPictographShared::SetCharacterSetsForPictograph

// It sets parameters to SCharacterSet array. It called in ConvertFromUnicode().

// It makes possible that pictograph conversion is called from other conversion

// plug-ins.

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

void CnvPictographShared::SetCharacterSetsForPictograph(

        RArray<CnvUtilities::SCharacterSet>& /*aArrayOfCharacterSets*/)

    {

    // SAMPLE CODE

    // If this module needs to support escape sequence pictograph,

    // Remove the comment from the following code.

    // CnvUtilities::SCharacterSet characterSet;

    // characterSet.iConversionData = &CnvPictograph1::ConversionData();

    // characterSet.iConvertFromIntermediateBufferInPlace =

    //     CnvPictographShared::ConvertToPictograph1InPlace;

    // characterSet.iEscapeSequence = &KLit8EscapeSequenceForPictograph1;

    // aArrayOfCharacterSets.Append(characterSet);

    }

// -----------------------------------------------------------------------------

// CnvPictographShared::SetMethodsForPictograph

// It sets parameters to SMethod array. It called in ConvertToUnicode().

// It makes possible that pictograph conversion is called from other conversion

// plug-ins.

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

void CnvPictographShared::SetMethodsForPictograph(

        RArray<CnvUtilities::SMethod>& aArrayOfMethods, TOriginalCharset aOriginalCharset)

    {

    CnvUtilities::SMethod method;

    switch (aOriginalCharset)

        {

        case ECharsetShiftJis:

            method.iNumberOfBytesAbleToConvert =

                CnvPictographShared::NumberOfBytesAbleToConvertSJisDirectMap;

            method.iConvertToIntermediateBufferInPlace =

                DummyConvertToIntermediateBufferInPlace;

            method.iConversionData =

                &CnvShiftJisDirectmap::ConversionData();

            method.iNumberOfBytesPerCharacter = 2;

            method.iNumberOfCoreBytesPerCharacter = 2;

            aArrayOfMethods.Append(method);

            break;

        case ECharsetEucJp:

            method.iNumberOfBytesAbleToConvert =

                CnvPictographShared::NumberOfBytesAbleToConvertToEucJpDirectMap1;

            method.iConvertToIntermediateBufferInPlace =

                CnvPictographShared::ConvertToPictographFromEucJpPackedInPlace;

            method.iConversionData =

                &CnvShiftJisDirectmap::ConversionData();

            method.iNumberOfBytesPerCharacter = 2;

            method.iNumberOfCoreBytesPerCharacter = 2;

            aArrayOfMethods.Append(method);

            method.iNumberOfBytesAbleToConvert =

                CnvPictographShared::NumberOfBytesAbleToConvertToEucJpDirectMap2;

            method.iConvertToIntermediateBufferInPlace =

                CnvPictographShared::ConvertToPictographFromEucJpPackedInPlace;

            method.iConversionData =

                &CnvShiftJisDirectmap::ConversionData();

            method.iNumberOfBytesPerCharacter = 3;

            method.iNumberOfCoreBytesPerCharacter = 2;

            aArrayOfMethods.Append(method);

            break;

        default:

            break;

        }

    // SAMPLE CODE

    // If this module needs to support escape sequence pictograph,

    // Remove the comment from the following code.

    // method.iNumberOfBytesAbleToConvert =

    //     CnvPictographShared::NumberOfBytesAbleToConvertToPicto1;

    // method.iConvertToIntermediateBufferInPlace =

    //     CnvPictographShared::ConvertToPictographFromUnicode;

    // method.iConversionData = &CnvPictograph1::ConversionData();

    // method.iNumberOfBytesPerCharacter = 1;

    // method.iNumberOfCoreBytesPerCharacter = 1;

    // aArrayOfMethods.Append(method);

    }

// -----------------------------------------------------------------------------

// CnvPictographShared::SetCharacterSetsForPictograph

// It sets parameters to SState array. It called in ConvertToUnicode().

// It makes possible that pictograph conversion is called from other

// conversion plug-ins.

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

void CnvPictographShared::SetCharacterSetsForPictograph(

        RArray<CnvUtilities::SCharacterSet>& aArrayOfStates,

        TOriginalCharset aOriginalCharset)

    {

    CnvUtilities::SCharacterSet characterSet;

    switch (aOriginalCharset)

        {

        case ECharsetShiftJis:

            // Append the character set for pictograph

            characterSet.iConversionData =

                &CnvShiftJisDirectmap::ConversionData();

            characterSet.iConvertFromIntermediateBufferInPlace =

                DummyConvertFromIntermediateBufferInPlace;

            characterSet.iEscapeSequence = &KNullDesC8;

            aArrayOfStates.Append(characterSet);

            break;

        case ECharsetEucJp:

            // Append the character set for pictograph1

            characterSet.iConversionData = &CnvShiftJisDirectmap::ConversionData();

            characterSet.iConvertFromIntermediateBufferInPlace =

                ConvertFromPictogaphToEucJpDirectmapInPlace;

            characterSet.iEscapeSequence = &KNullDesC8;

            aArrayOfStates.Append(characterSet);

            // Append the character set for pictograph2

            characterSet.iConversionData = &CnvShiftJisDirectmap::ConversionData();

            characterSet.iConvertFromIntermediateBufferInPlace =

                ConvertFromPictogaphToEucJpDirectmapInPlace;

            characterSet.iEscapeSequence = &KNullDesC8;

            aArrayOfStates.Append(characterSet);

            break;

        default:

            break;

        }

    }

// -----------------------------------------------------------------------------

// CnvPictographShared::SetStatesForPictograph

// It sets parameters to SState array. It called in ConvertToUnicode().

// It makes possible that pictograph conversion is called from other

// conversion plug-ins.

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

void CnvPictographShared::SetStatesForPictograph(

        RArray<CnvUtilities::SState>& /*aArrayOfStates*/)

    {

    // SAMPLE CODE

    // If this module needs to support escape sequence pictograph,

    // Remove the comment from the following code.

    // CnvUtilities::SState state;

    // state.iEscapeSequence = &KLit8EscapeSequenceForPictograph1;

    // state.iConversionData = &CnvPictograph1::ConversionData();

    // aArrayOfStates.Append(state);

    }

// -----------------------------------------------------------------------------

// CnvPictographShared::ConvertToPictograph1InPlace

// It converts from an intermediate buffer to a pictograph code.

// After that, it adds shift-in code(0x0F).

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

// void CnvPictographShared::ConvertToPictograph1InPlace(

//         TInt aStartPositionInDescriptor,

//         TDes8& aDescriptor, TInt& aNumberOfCharactersThatDroppedOut)

//     {

//     CnvUtilities::ConvertFromIntermediateBufferInPlace(

//         aStartPositionInDescriptor, aDescriptor,

//         aNumberOfCharactersThatDroppedOut,

//         KLit8EscapeSequenceForPictograph1, 1);

//     AppendShiftIn(aDescriptor, aNumberOfCharactersThatDroppedOut);

//     }

// -----------------------------------------------------------------------------

// CnvPictographShared::NumberOfBytesAbleToConvertToPicto1

// It returns a number of bytes that the conversion to pictograph is

// possible in the descriptor.

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

TInt CnvPictographShared::NumberOfBytesAbleToConvertSJisDirectMap(

        const TDesC8& aDescriptor)

    {

    const TUint8* pointerToPreviousByte = aDescriptor.Ptr()-1;

    const TUint8* const pointerToLastByte =

            pointerToPreviousByte + aDescriptor.Length();

    if (pointerToPreviousByte == pointerToLastByte)

        {

        return 0;

        }

    for (; pointerToPreviousByte < pointerToLastByte; )

        {

        const TUint currentByte = *(pointerToPreviousByte + 1);

        const TUint nextByte = *(pointerToPreviousByte + 2);

        if (((currentByte < KSingleByteRangeFirstBlockStart) ||

             (currentByte > KSingleByteRangeFirstBlockEnd)) ||

            ((nextByte < KSingleByteRangeSecondBlockStart) ||

             (nextByte > KSingleByteRangeSecondBlockEnd)))

            {

            break;

            }

        pointerToPreviousByte += 2;

        }

    return (pointerToPreviousByte + 1) - aDescriptor.Ptr();

    }

// -----------------------------------------------------------------------------

// NumberOfBytesAbleToConvertToEucJpDirectMap1

//

// -----------------------------------------------------------------------------

//

TInt CnvPictographShared::NumberOfBytesAbleToConvertToEucJpDirectMap1(

        const TDesC8& aDescriptor)

    {

    const TUint8* pointerToPreviousByte = aDescriptor.Ptr() - 1;

    const TUint8* const pointerToLastByte =

        pointerToPreviousByte + aDescriptor.Length();

    if (pointerToPreviousByte == pointerToLastByte)

        {

        return 0;

        }

    for (;pointerToPreviousByte < pointerToLastByte;)

        {

        TUint currentByte = *(pointerToPreviousByte + 1);

        const TUint nextByte = *(pointerToPreviousByte + 2);

        if (((currentByte < KFirstByteRangeFirstBlockStart) ||

             (currentByte > KFirstByteRangeFirstBlockEnd)) ||

            ((nextByte < KSecondByteRangeSecondBlockStart) ||

             (nextByte > KSecondByteRangeSecondBlockEnd)))

            {

            break;

            }

        pointerToPreviousByte += 2;

        }

    return (pointerToPreviousByte + 1) - aDescriptor.Ptr();

    }

// -----------------------------------------------------------------------------

// NumberOfBytesAbleToConvertToPictograph

//

// -----------------------------------------------------------------------------

//

TInt CnvPictographShared::NumberOfBytesAbleToConvertToEucJpDirectMap2(

        const TDesC8& aDescriptor)

    {

    const TUint8* pointerToPreviousByte = aDescriptor.Ptr() - 1;

    const TUint8* const pointerToLastByte =

        pointerToPreviousByte + aDescriptor.Length();

    if (pointerToPreviousByte == pointerToLastByte)

        {

        return 0;

        }

    for (;pointerToPreviousByte < pointerToLastByte;)

        {

        TUint currentByte = *(pointerToPreviousByte + 1);

        if (currentByte == KSingleShift3)

            {

            pointerToPreviousByte++;

            currentByte = *(pointerToPreviousByte + 1);

            }

        else

            {

            break;

            }

        if (currentByte < 0xa0)

            {

            return CCnvCharacterSetConverter::EErrorIllFormedInput;

            }

        const TUint nextByte = *(pointerToPreviousByte + 2);

        if (nextByte < 0xa0)

            {

            return CCnvCharacterSetConverter::EErrorIllFormedInput;

            }

        if (((currentByte < KFirstByteRangeFirstBlockStart) ||

             (currentByte > KFirstByteRangeFirstBlockEnd)) ||

            ((nextByte < KSecondByteRangeSecondBlockStart) ||

             (nextByte > KSecondByteRangeSecondBlockEnd)))

            {

            // return the previous byte to the beginning of loop.

            pointerToPreviousByte--;

            break;

            }

        pointerToPreviousByte += 2;

        }

    return (pointerToPreviousByte + 1) - aDescriptor.Ptr();

    }

// -----------------------------------------------------------------------------

// CnvPictographShared::NumberOfBytesAbleToConvertToPicto1

// It returns a number of bytes that the conversion to pictograph is

// possible in the descriptor.

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

TInt CnvPictographShared::NumberOfBytesAbleToConvertToPicto1(

        const TDesC8& aDescriptor)

    {

    return NumberOfBytesAbleToConvertToPictograph(aDescriptor,

        KIntermediateBuffer1);

    }

// -----------------------------------------------------------------------------

// CnvPictographShared::NumberOfBytesAbleToConvertToPictograph

// It's a common function for checking the number of bytes that the conversion

// to pictograph

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

TInt CnvPictographShared::NumberOfBytesAbleToConvertToPictograph(

        const TDesC8& aDescriptor, TInt aIntermidiateCode)

    {

    TInt compLen(KLit8EscapeSequenceForPictograph().Length());

    TInt ret(0);

    if (aDescriptor.Left(compLen) == KLit8EscapeSequenceForPictograph)

        {

        const TInt intermidiateBuff = aDescriptor[compLen];

        if (intermidiateBuff == aIntermidiateCode)

            {

            ret = compLen + 2;

            const TInt descriptorLength = aDescriptor.Length();

            const TUint8* pointerToCurrentByte = aDescriptor.Ptr();

            const TUint8* pointerToLastByte = pointerToCurrentByte +

                (descriptorLength - 1);

            pointerToCurrentByte += compLen + 2;

            for (; pointerToCurrentByte <= pointerToLastByte;

                 pointerToCurrentByte++)

                {

                if (*pointerToCurrentByte == KShiftIn)

                    {

                    ret++;

                    break;

                    }

                if (*pointerToCurrentByte == KEscape)

                    break;

                ret++;

                }

            }

        }

    return ret;

    }

// -----------------------------------------------------------------------------

// CnvPictographShared::ConvertToPictographFromUnicode

// It converts the string which includes a pictograph's escape sequence

// to unicode.

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

void CnvPictographShared::ConvertToPictographFromUnicode(TDes8& aDescriptor)

    {

    const TInt descriptorLength = aDescriptor.Length();

    TUint8* pointerToCurrentByte = CONST_CAST(TUint8*, aDescriptor.Ptr());

    TUint8* pointerToDataByte = pointerToCurrentByte +

        KLit8EscapeSequenceForPictograph().Length();

    const TUint8* const pointerToLastByte = pointerToCurrentByte +

        (descriptorLength - 1);

    const TUint8* const pointerToFirstByte = pointerToCurrentByte;

    pointerToDataByte++;