/*
* Copyright (c) 1997-2009 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:       
*
*/

#include "PictographObserver.h"

#include <e32std.h>
#include <charconv.h>
#include <convutils.h>
#include "jisx0201.h"
#include "jisx0208.h"
#include "jisx0212.h"
#include <ecom/implementationproxy.h>
#include "charactersetconverter.h"
#include "featmgr/featmgr.h" 

const TUint KSingleShift2=0x8e;
const TUint KSingleShift3=0x8f;

// SecureID for Brower app
const TUint32 KBrowserSecureId = 0x10008D39;
// Define for converting from YenSign to BackSlash
const TUint KCharacterCodeForYenSign = 0x00A5;
const TUint KCharacterCodeForBackSlash = 0x005C;

_LIT8(KLit8EucJpPackedReplacementForUnconvertibleUnicodeCharacters, "\xa1\xa9"); // fullwidth question mark

#if defined(_DEBUG)

_LIT(KLitPanicText, "EUCJP_PACKED");

enum TPanic
    {
    EPanicNothingToConvert1=1,
    EPanicNothingToConvert2,
    EPanicNothingToConvert3,
    EPanicNothingToConvert4,
    EPanicNothingToConvert5,
    EPanicNothingToConvert6,
    EPanicOddNumberOfBytes1,
    EPanicOddNumberOfBytes2,
    EPanicOddNumberOfBytes3,
    EPanicOddNumberOfBytes4,
    EPanicOddNumberOfBytes5,
    EPanicOddNumberOfBytes6,
    EPanicBadHighBit1,
    EPanicBadHighBit2,
    EPanicBadHighBit3,
    EPanicBadHighBit4,
    EPanicBadHighBit5,
    EPanicBadHighBit6,
    EPanicBadHighBit7,
    EPanicBadPointers1,
    EPanicBadPointers2,
    EPanicBadPointers3,
    EPanicBadPointers4,
    EPanicBadPointers5,
    EPanicBadPointers6,
    EPanicBadPointers7,
    EPanicBadPointers8,
    EPanicBadPointers9,
    EPanicBadPointers10,
    EPanicBadPointers11,
    EPanicBadPointers12,
    EPanicBadPointers13,
    EPanicBadPointers14,
    EPanicBadPointers15,
    EPanicBadPointers16,
    EPanicBadPointers17,
    EPanicBadPointers18,
    EPanicBadPointers19,
    EPanicBadPointers20,
    EPanicBadPointers21,
    EPanicBadPointers22,
    EPanicBadPointers23,
    EPanicBadPointers24,
    EPanicBadPointers25,
    EPanicBadPointers26,
    EPanicBadPointers27,
    EPanicBadPointers28,
    EPanicBadPointers29,
    EPanicBadPointers30,
    EPanicBadPointers31,
    EPanicBadPointers32,
    EPanicBadPointers33,
    EPanicBadPointers34,
    EPanicBadPointers35,
    EPanicBadPointers36,
    EPanicBadCalculation1,
    EPanicBadCalculation2,
    EPanicNumberOfBytesIsNotMultipleOfThree1,
    EPanicNumberOfBytesIsNotMultipleOfThree2,
    EPanicSingleShift2Expected,
    EPanicSingleShift3Expected
    };

LOCAL_C void Panic(TPanic aPanic)
    {
    User::Panic(KLitPanicText, aPanic);
    }

#endif


class CEucjpPackedConverterImpl : public CCharacterSetConverterPluginInterface
    {

public:
    virtual const TDesC8& ReplacementForUnconvertibleUnicodeCharacters();

    virtual TInt ConvertFromUnicode(
        CCnvCharacterSetConverter::TEndianness aDefaultEndiannessOfForeignCharacters,
        const TDesC8& aReplacementForUnconvertibleUnicodeCharacters,
        TDes8& aForeign,
        const TDesC16& aUnicode,
        CCnvCharacterSetConverter::TArrayOfAscendingIndices& aIndicesOfUnconvertibleCharacters);

    virtual TInt ConvertToUnicode(
        CCnvCharacterSetConverter::TEndianness aDefaultEndiannessOfForeignCharacters,
        TDes16& aUnicode,
        const TDesC8& aForeign,
        TInt& aState,
        TInt& aNumberOfUnconvertibleCharacters,
        TInt& aIndexOfFirstByteOfFirstUnconvertibleCharacter);

    virtual TBool IsInThisCharacterSetL(
        TBool& aSetToTrue,
        TInt& aConfidenceLevel,
        const TDesC8& aSample);

    static CEucjpPackedConverterImpl* NewL();
    virtual ~CEucjpPackedConverterImpl();

private:
    CEucjpPackedConverterImpl();
    void ConstructL();

    };





const TDesC8& CEucjpPackedConverterImpl::ReplacementForUnconvertibleUnicodeCharacters()
    {
    return KLit8EucJpPackedReplacementForUnconvertibleUnicodeCharacters;
    }

LOCAL_C void DummyConvertFromIntermediateBufferInPlace(TInt, TDes8&, TInt& aNumberOfCharactersThatDroppedOut)
    {
    aNumberOfCharactersThatDroppedOut=0;
    }

LOCAL_C void ConvertFromJisX0208ToEucJpPackedInPlace(TInt aStartPositionInDescriptor, TDes8& aDescriptor, TInt& aNumberOfCharactersThatDroppedOut)
    {
    aNumberOfCharactersThatDroppedOut=0;
    const TInt descriptorLength=aDescriptor.Length();
    __ASSERT_DEBUG(descriptorLength>aStartPositionInDescriptor, Panic(EPanicNothingToConvert1));
    __ASSERT_DEBUG((descriptorLength-aStartPositionInDescriptor)%2==0, Panic(EPanicOddNumberOfBytes1));
    TUint8* pointerToCurrentByte=CONST_CAST(TUint8*, aDescriptor.Ptr());
    const TUint8* const pointerToLastByte=pointerToCurrentByte+(descriptorLength-1);
    pointerToCurrentByte+=aStartPositionInDescriptor;
    FOREVER
        {
        const TUint currentByte=*pointerToCurrentByte;
        __ASSERT_DEBUG((currentByte&0x80)==0, Panic(EPanicBadHighBit1));
        *pointerToCurrentByte=STATIC_CAST(TUint8, currentByte|0x80);
        __ASSERT_DEBUG(pointerToCurrentByte<=pointerToLastByte, Panic(EPanicBadPointers1));
        if (pointerToCurrentByte>=pointerToLastByte)
            {
            break;
            }
        ++pointerToCurrentByte;
        }
    }

LOCAL_C void ConvertFromHalfWidthKatakana8ToEucJpPackedInPlace(TInt aStartPositionInDescriptor, TDes8& aDescriptor, TInt& aNumberOfCharactersThatDroppedOut)
    {
    TInt descriptorLength=aDescriptor.Length();
    __ASSERT_DEBUG(descriptorLength>aStartPositionInDescriptor, Panic(EPanicNothingToConvert2));
    aNumberOfCharactersThatDroppedOut=Max(0, (descriptorLength-aStartPositionInDescriptor)-((aDescriptor.MaxLength()-aStartPositionInDescriptor)/2));
    descriptorLength-=aNumberOfCharactersThatDroppedOut;
    __ASSERT_DEBUG(descriptorLength>=aStartPositionInDescriptor, Panic(EPanicBadCalculation1));
    if (descriptorLength<=aStartPositionInDescriptor)
        {
        aDescriptor.SetLength(descriptorLength);
        }
    else
        {
        TUint8* pointerToTargetByte=CONST_CAST(TUint8*, aDescriptor.Ptr()); // pointerToTargetByte is initialized properly when descriptorLength has been offset to the actual final length of aDescriptor
        const TUint8* const pointerToFirstByte=pointerToTargetByte+aStartPositionInDescriptor;
        const TUint8* pointerToSourceByte=pointerToTargetByte+(descriptorLength-1);
        descriptorLength=((descriptorLength-aStartPositionInDescriptor)*2)+aStartPositionInDescriptor;
        __ASSERT_DEBUG((descriptorLength-aStartPositionInDescriptor)%2==0, Panic(EPanicOddNumberOfBytes2));
        aDescriptor.SetLength(descriptorLength);
        pointerToTargetByte+=descriptorLength-1; // pointerToTargetByte is is initialized properly here
        FOREVER
            {
            *pointerToTargetByte=*pointerToSourceByte;
            __ASSERT_DEBUG(pointerToTargetByte>pointerToFirstByte, Panic(EPanicBadPointers2));
            --pointerToTargetByte;
            *pointerToTargetByte=KSingleShift2;
            __ASSERT_DEBUG(pointerToTargetByte>=pointerToFirstByte, Panic(EPanicBadPointers3));
            if (pointerToTargetByte<=pointerToFirstByte)
                {
                break;
                }
            --pointerToTargetByte;
            __ASSERT_DEBUG(pointerToSourceByte>pointerToFirstByte, Panic(EPanicBadPointers4));
            --pointerToSourceByte;
            }
        __ASSERT_DEBUG(pointerToTargetByte==pointerToFirstByte, Panic(EPanicBadPointers5));
        __ASSERT_DEBUG(pointerToSourceByte==pointerToFirstByte, Panic(EPanicBadPointers6));
        }
    }

LOCAL_C void ConvertFromJisX0212ToEucJpPackedInPlace(TInt aStartPositionInDescriptor, TDes8& aDescriptor, TInt& aNumberOfCharactersThatDroppedOut)
    {
    TInt descriptorLength=aDescriptor.Length();
    __ASSERT_DEBUG(descriptorLength>aStartPositionInDescriptor, Panic(EPanicNothingToConvert3));
    __ASSERT_DEBUG((descriptorLength-aStartPositionInDescriptor)%2==0, Panic(EPanicOddNumberOfBytes3));
    aNumberOfCharactersThatDroppedOut=Max(0, ((descriptorLength-aStartPositionInDescriptor)/2)-((aDescriptor.MaxLength()-aStartPositionInDescriptor)/3));
    descriptorLength-=aNumberOfCharactersThatDroppedOut*2;
    __ASSERT_DEBUG(descriptorLength>=aStartPositionInDescriptor, Panic(EPanicBadCalculation2));
    if (descriptorLength<=aStartPositionInDescriptor)
        {
        aDescriptor.SetLength(descriptorLength);
        }
    else
        {
        __ASSERT_DEBUG((descriptorLength-aStartPositionInDescriptor)%2==0, Panic(EPanicOddNumberOfBytes4));
        TUint8* pointerToTargetByte=CONST_CAST(TUint8*, aDescriptor.Ptr()); // pointerToTargetByte is initialized properly when descriptorLength has been offset to the actual final length of aDescriptor
        const TUint8* const pointerToFirstByte=pointerToTargetByte+aStartPositionInDescriptor;
        const TUint8* pointerToSourceByte=pointerToTargetByte+(descriptorLength-1);
        descriptorLength=(((descriptorLength-aStartPositionInDescriptor)*3)/2)+aStartPositionInDescriptor;
        __ASSERT_DEBUG((descriptorLength-aStartPositionInDescriptor)%3==0, Panic(EPanicNumberOfBytesIsNotMultipleOfThree1));
        aDescriptor.SetLength(descriptorLength);
        pointerToTargetByte+=descriptorLength-1; // pointerToTargetByte is is initialized properly here
        FOREVER
            {
            __ASSERT_DEBUG((*pointerToSourceByte&0x80)==0, Panic(EPanicBadHighBit2));
            *pointerToTargetByte=STATIC_CAST(TUint8, *pointerToSourceByte|0x80);
            __ASSERT_DEBUG(pointerToTargetByte>pointerToFirstByte, Panic(EPanicBadPointers7));
            --pointerToTargetByte;
            __ASSERT_DEBUG(pointerToSourceByte>pointerToFirstByte, Panic(EPanicBadPointers8));
            --pointerToSourceByte;
            __ASSERT_DEBUG((*pointerToSourceByte&0x80)==0, Panic(EPanicBadHighBit3));
            *pointerToTargetByte=STATIC_CAST(TUint8, *pointerToSourceByte|0x80);
            __ASSERT_DEBUG(pointerToTargetByte>pointerToFirstByte, Panic(EPanicBadPointers9));
            --pointerToTargetByte;
            *pointerToTargetByte=KSingleShift3;
            __ASSERT_DEBUG(pointerToTargetByte>=pointerToFirstByte, Panic(EPanicBadPointers10));
            if (pointerToTargetByte<=pointerToFirstByte)
                {
                break;
                }
            --pointerToTargetByte;
            __ASSERT_DEBUG(pointerToSourceByte>pointerToFirstByte, Panic(EPanicBadPointers11));
            --pointerToSourceByte;
            }
        __ASSERT_DEBUG(pointerToTargetByte==pointerToFirstByte, Panic(EPanicBadPointers12));
        __ASSERT_DEBUG(pointerToSourceByte==pointerToFirstByte, Panic(EPanicBadPointers13));
        }
    }

TInt CEucjpPackedConverterImpl::ConvertFromUnicode(
        CCnvCharacterSetConverter::TEndianness aDefaultEndiannessOfForeignCharacters,
        const TDesC8& aReplacementForUnconvertibleUnicodeCharacters,
        TDes8& aForeign,
        const TDesC16& aUnicode,
        CCnvCharacterSetConverter::TArrayOfAscendingIndices& aIndicesOfUnconvertibleCharacters)
    {
    RArray<CnvUtilities::SCharacterSet> characterSets;
    if ( FeatureManager::FeatureSupported(KFeatureIdJapanesePicto) )
        {      
        CnvUtilities::SCharacterSet characterSet;

        characterSet.iConversionData=&CnvJisRoman::ConversionData();
        characterSet.iConvertFromIntermediateBufferInPlace=DummyConvertFromIntermediateBufferInPlace;
        characterSet.iEscapeSequence=&KNullDesC8;
        characterSets.Append(characterSet);
        characterSet.iConversionData=&CnvJisX0208::ConversionData();
        characterSet.iConvertFromIntermediateBufferInPlace=ConvertFromJisX0208ToEucJpPackedInPlace;
        characterSet.iEscapeSequence=&KNullDesC8;
        characterSets.Append(characterSet);
        characterSet.iConversionData=&CnvHalfWidthKatakana8::ConversionData();
        characterSet.iConvertFromIntermediateBufferInPlace=ConvertFromHalfWidthKatakana8ToEucJpPackedInPlace;
        characterSet.iEscapeSequence=&KNullDesC8;
        characterSets.Append(characterSet);
        characterSet.iConversionData=&CnvJisX0212::ConversionData();
        characterSet.iConvertFromIntermediateBufferInPlace=ConvertFromJisX0212ToEucJpPackedInPlace;
        characterSet.iEscapeSequence=&KNullDesC8;
        characterSets.Append(characterSet);

        SetCharacterSetsForPictograph(characterSets, ECharsetEucJp);
        }
    else
        {            
        CnvUtilities::SCharacterSet characterSet;
        characterSet.iConversionData=&CnvJisRoman::ConversionData();
        characterSet.iConvertFromIntermediateBufferInPlace=DummyConvertFromIntermediateBufferInPlace;
        characterSet.iEscapeSequence=&KNullDesC8;
        characterSets.Append(characterSet);
        characterSet.iConversionData=&CnvJisX0208::ConversionData();
        characterSet.iConvertFromIntermediateBufferInPlace=ConvertFromJisX0208ToEucJpPackedInPlace;
        characterSet.iEscapeSequence=&KNullDesC8;
        characterSets.Append(characterSet);
        characterSet.iConversionData=&CnvHalfWidthKatakana8::ConversionData();
        characterSet.iConvertFromIntermediateBufferInPlace=ConvertFromHalfWidthKatakana8ToEucJpPackedInPlace;
        characterSet.iEscapeSequence=&KNullDesC8;
        characterSets.Append(characterSet);
        characterSet.iConversionData=&CnvJisX0212::ConversionData();
        characterSet.iConvertFromIntermediateBufferInPlace=ConvertFromJisX0212ToEucJpPackedInPlace;
        characterSet.iEscapeSequence=&KNullDesC8;
        characterSets.Append(characterSet);
        }
    TInt unconvert = CnvUtilities::ConvertFromUnicode(aDefaultEndiannessOfForeignCharacters, aReplacementForUnconvertibleUnicodeCharacters, aForeign, aUnicode, aIndicesOfUnconvertibleCharacters, characterSets.Array());

    characterSets.Close();
    return unconvert;
    }

LOCAL_C TInt NumberOfBytesAbleToConvertToJisRoman(const TDesC8& aDescriptor)
    {
    const TUint8* pointerToPreviousByte=aDescriptor.Ptr()-1;
    const TUint8* const pointerToLastByte=pointerToPreviousByte+aDescriptor.Length();
    if (pointerToPreviousByte==pointerToLastByte)
        {
        return 0;
        }
    FOREVER
        {
        __ASSERT_DEBUG(pointerToPreviousByte<pointerToLastByte, Panic(EPanicBadPointers14));
        const TUint currentByte=*(pointerToPreviousByte+1);
        if (currentByte&0x80)
            {
            break;
            }
        __ASSERT_DEBUG(pointerToPreviousByte<pointerToLastByte, Panic(EPanicBadPointers15));
        ++pointerToPreviousByte;
        __ASSERT_DEBUG(pointerToPreviousByte<=pointerToLastByte, Panic(EPanicBadPointers16));
        if (pointerToPreviousByte>=pointerToLastByte)
            {
            break;
            }
        }
    return (pointerToPreviousByte+1)-aDescriptor.Ptr();
    }

LOCAL_C TInt NumberOfBytesAbleToConvertToJisX0208(const TDesC8& aDescriptor)
    {
    const TUint8* pointerToPreviousByte=aDescriptor.Ptr()-1;
    const TUint8* const pointerToLastByte=pointerToPreviousByte+aDescriptor.Length();
    if (pointerToPreviousByte==pointerToLastByte)
        {
        return 0;
        }
    FOREVER
        {
        __ASSERT_DEBUG(pointerToPreviousByte<pointerToLastByte, Panic(EPanicBadPointers17));
        TUint currentByte=*(pointerToPreviousByte+1);
        if (currentByte<0xa0)
            {
            break;
            }
        __ASSERT_DEBUG(pointerToPreviousByte<pointerToLastByte, Panic(EPanicBadPointers18));
        if (pointerToLastByte-pointerToPreviousByte<2)
            {
            break;
            }
        ++pointerToPreviousByte;
        currentByte=*(pointerToPreviousByte+1);
        if (currentByte<0xa0)
            {
            return CCnvCharacterSetConverter::EErrorIllFormedInput;
            }
        __ASSERT_DEBUG(pointerToPreviousByte<pointerToLastByte, Panic(EPanicBadPointers19));
        ++pointerToPreviousByte;
        __ASSERT_DEBUG(pointerToPreviousByte<=pointerToLastByte, Panic(EPanicBadPointers20));
        if (pointerToPreviousByte>=pointerToLastByte)
            {
            break;
            }
        }
    return (pointerToPreviousByte+1)-aDescriptor.Ptr();
    }

LOCAL_C TInt NumberOfBytesAbleToConvertToHalfWidthKatakana8(const TDesC8& aDescriptor)
    {
    const TUint8* pointerToPreviousByte=aDescriptor.Ptr()-1;
    const TUint8* const pointerToLastByte=pointerToPreviousByte+aDescriptor.Length();
    if (pointerToPreviousByte==pointerToLastByte)
        {
        return 0;
        }
    FOREVER
        {
        __ASSERT_DEBUG(pointerToPreviousByte<pointerToLastByte, Panic(EPanicBadPointers21));
        TUint currentByte=*(pointerToPreviousByte+1);
        if (currentByte!=KSingleShift2)
            {
            break;
            }
        __ASSERT_DEBUG(pointerToPreviousByte<pointerToLastByte, Panic(EPanicBadPointers22));
        if (pointerToLastByte-pointerToPreviousByte<2)
            {
            break;
            }
        ++pointerToPreviousByte;
        currentByte=*(pointerToPreviousByte+1);
        if (currentByte<0xa0)
            {
            return CCnvCharacterSetConverter::EErrorIllFormedInput;
            }
        __ASSERT_DEBUG(pointerToPreviousByte<pointerToLastByte, Panic(EPanicBadPointers23));
        ++pointerToPreviousByte;
        __ASSERT_DEBUG(pointerToPreviousByte<=pointerToLastByte, Panic(EPanicBadPointers24));
        if (pointerToPreviousByte>=pointerToLastByte)
            {
            break;
            }
        }
    return (pointerToPreviousByte+1)-aDescriptor.Ptr();
    }

LOCAL_C TInt NumberOfBytesAbleToConvertToJisX0212(const TDesC8& aDescriptor)
    {
    const TUint8* pointerToPreviousByte=aDescriptor.Ptr()-1;
    const TUint8* const pointerToLastByte=pointerToPreviousByte+aDescriptor.Length();
    if (pointerToPreviousByte==pointerToLastByte)
        {
        return 0;
        }
    FOREVER
        {
        __ASSERT_DEBUG(pointerToPreviousByte<pointerToLastByte, Panic(EPanicBadPointers25));
        TUint currentByte=*(pointerToPreviousByte+1);
        if (currentByte!=KSingleShift3)
            {
            break;
            }
        __ASSERT_DEBUG(pointerToPreviousByte<pointerToLastByte, Panic(EPanicBadPointers26));
        if (pointerToLastByte-pointerToPreviousByte<3)
            {
            break;
            }
        ++pointerToPreviousByte;
        currentByte=*(pointerToPreviousByte+1);
        if (currentByte<0xa0)
            {
            return CCnvCharacterSetConverter::EErrorIllFormedInput;
            }
        __ASSERT_DEBUG(pointerToPreviousByte<pointerToLastByte, Panic(EPanicBadPointers27));
        ++pointerToPreviousByte;
        currentByte=*(pointerToPreviousByte+1);
        if (currentByte<0xa0)
            {
            return CCnvCharacterSetConverter::EErrorIllFormedInput;
            }
        __ASSERT_DEBUG(pointerToPreviousByte<pointerToLastByte, Panic(EPanicBadPointers28));
        ++pointerToPreviousByte;
        __ASSERT_DEBUG(pointerToPreviousByte<=pointerToLastByte, Panic(EPanicBadPointers29));
        if (pointerToPreviousByte>=pointerToLastByte)
            {
            break;
            }
        }
    return (pointerToPreviousByte+1)-aDescriptor.Ptr();
    }

LOCAL_C void DummyConvertToIntermediateBufferInPlace(TDes8&)
    {
    }

LOCAL_C void ConvertToJisX0208FromEucJpPackedInPlace(TDes8& aDescriptor)
    {
    const TInt descriptorLength=aDescriptor.Length();
    __ASSERT_DEBUG(descriptorLength>0, Panic(EPanicNothingToConvert4));
    __ASSERT_DEBUG(descriptorLength%2==0, Panic(EPanicOddNumberOfBytes5));
    TUint8* pointerToCurrentByte=CONST_CAST(TUint8*, aDescriptor.Ptr());
    const TUint8* const pointerToLastByte=pointerToCurrentByte+(descriptorLength-1);
    FOREVER
        {
        const TUint currentByte=*pointerToCurrentByte;
        __ASSERT_DEBUG(currentByte&0x80, Panic(EPanicBadHighBit4));
        *pointerToCurrentByte=STATIC_CAST(TUint8, currentByte&~0x80);
        __ASSERT_DEBUG(pointerToCurrentByte<=pointerToLastByte, Panic(EPanicBadPointers30));
        if (pointerToCurrentByte>=pointerToLastByte)
            {
            break;
            }
        ++pointerToCurrentByte;
        }
    }

LOCAL_C void ConvertToHalfWidthKatakana8FromEucJpPackedInPlace(TDes8& aDescriptor)
    {
    const TInt descriptorLength=aDescriptor.Length();
    __ASSERT_DEBUG(descriptorLength>0, Panic(EPanicNothingToConvert5));
    __ASSERT_DEBUG(descriptorLength%2==0, Panic(EPanicOddNumberOfBytes6));
    TUint8* pointerToTargetByte=CONST_CAST(TUint8*, aDescriptor.Ptr());
    const TUint8* pointerToSourceByte=pointerToTargetByte;
    const TUint8* const pointerToLastByte=pointerToSourceByte+(descriptorLength-1);
    FOREVER
        {
        __ASSERT_DEBUG(*pointerToSourceByte==KSingleShift2, Panic(EPanicSingleShift2Expected));
        __ASSERT_DEBUG(pointerToSourceByte<pointerToLastByte, Panic(EPanicBadPointers31));
        ++pointerToSourceByte;
        const TUint sourceByte=*pointerToSourceByte;
        __ASSERT_DEBUG(sourceByte&0x80, Panic(EPanicBadHighBit5));
        *pointerToTargetByte=STATIC_CAST(TUint8, sourceByte);
        __ASSERT_DEBUG(pointerToSourceByte<=pointerToLastByte, Panic(EPanicBadPointers32));
        if (pointerToSourceByte>=pointerToLastByte)
            {
            break;
            }
        ++pointerToSourceByte;
        ++pointerToTargetByte;
        }
    aDescriptor.SetLength(descriptorLength/2);
    }

LOCAL_C void ConvertToJisX0212FromEucJpPackedInPlace(TDes8& aDescriptor)
    {
    const TInt descriptorLength=aDescriptor.Length();
    __ASSERT_DEBUG(descriptorLength>0, Panic(EPanicNothingToConvert6));
    __ASSERT_DEBUG(descriptorLength%3==0, Panic(EPanicNumberOfBytesIsNotMultipleOfThree2));
    TUint8* pointerToTargetByte=CONST_CAST(TUint8*, aDescriptor.Ptr());
    const TUint8* pointerToSourceByte=pointerToTargetByte;
    const TUint8* const pointerToLastByte=pointerToSourceByte+(descriptorLength-1);
    FOREVER
        {
        __ASSERT_DEBUG(*pointerToSourceByte==KSingleShift3, Panic(EPanicSingleShift3Expected));
        __ASSERT_DEBUG(pointerToSourceByte<pointerToLastByte, Panic(EPanicBadPointers33));
        ++pointerToSourceByte;
        TUint sourceByte=*pointerToSourceByte;
        __ASSERT_DEBUG(sourceByte&0x80, Panic(EPanicBadHighBit6));
        *pointerToTargetByte=STATIC_CAST(TUint8, sourceByte&~0x80);
        __ASSERT_DEBUG(pointerToSourceByte<pointerToLastByte, Panic(EPanicBadPointers34));
        ++pointerToSourceByte;
        sourceByte=*pointerToSourceByte;
        __ASSERT_DEBUG(sourceByte&0x80, Panic(EPanicBadHighBit7));
        __ASSERT_DEBUG(pointerToTargetByte<pointerToLastByte, Panic(EPanicBadPointers35));
        ++pointerToTargetByte;
        *pointerToTargetByte=STATIC_CAST(TUint8, sourceByte&~0x80);
        __ASSERT_DEBUG(pointerToSourceByte<=pointerToLastByte, Panic(EPanicBadPointers36));
        if (pointerToSourceByte>=pointerToLastByte)
            {
            break;
            }
        ++pointerToSourceByte;
        ++pointerToTargetByte;
        }
    aDescriptor.SetLength((descriptorLength/3)*2);
    }

TInt CEucjpPackedConverterImpl::ConvertToUnicode(
        CCnvCharacterSetConverter::TEndianness aDefaultEndiannessOfForeignCharacters,
        TDes16& aUnicode,
        const TDesC8& aForeign,
        TInt& /*aState*/,
        TInt& aNumberOfUnconvertibleCharacters,
        TInt& aIndexOfFirstByteOfFirstUnconvertibleCharacter)
    {
    RArray<CnvUtilities::SMethod> methods;
    if ( FeatureManager::FeatureSupported(KFeatureIdJapanesePicto) )
        {      
        CnvUtilities::SMethod method;
        SetMethodsForPictograph(methods, ECharsetEucJp);
        method.iNumberOfBytesAbleToConvert=NumberOfBytesAbleToConvertToJisRoman;
        method.iConvertToIntermediateBufferInPlace=DummyConvertToIntermediateBufferInPlace;
        method.iConversionData=&CnvJisRoman::ConversionData();
        method.iNumberOfBytesPerCharacter=1;
        method.iNumberOfCoreBytesPerCharacter=1;
        methods.Append(method);
        method.iNumberOfBytesAbleToConvert=NumberOfBytesAbleToConvertToJisX0208;
        method.iConvertToIntermediateBufferInPlace=ConvertToJisX0208FromEucJpPackedInPlace;
        method.iConversionData=&CnvJisX0208::ConversionData();
        method.iNumberOfBytesPerCharacter=2;
        method.iNumberOfCoreBytesPerCharacter=2;
        methods.Append(method);
        method.iNumberOfBytesAbleToConvert=NumberOfBytesAbleToConvertToHalfWidthKatakana8;
        method.iConvertToIntermediateBufferInPlace=ConvertToHalfWidthKatakana8FromEucJpPackedInPlace;
        method.iConversionData=&CnvHalfWidthKatakana8::ConversionData();
        method.iNumberOfBytesPerCharacter=2;
        method.iNumberOfCoreBytesPerCharacter=1;
        methods.Append(method);
        method.iNumberOfBytesAbleToConvert=NumberOfBytesAbleToConvertToJisX0212;
        method.iConvertToIntermediateBufferInPlace=ConvertToJisX0212FromEucJpPackedInPlace;
        method.iConversionData=&CnvJisX0212::ConversionData();
        method.iNumberOfBytesPerCharacter=3;
        method.iNumberOfCoreBytesPerCharacter=2;
        methods.Append(method);
        }
    else
        {
        CnvUtilities::SMethod method;
        method.iNumberOfBytesAbleToConvert=NumberOfBytesAbleToConvertToJisRoman;
        method.iConvertToIntermediateBufferInPlace=DummyConvertToIntermediateBufferInPlace;
        method.iConversionData=&CnvJisRoman::ConversionData();
        method.iNumberOfBytesPerCharacter=1;
        method.iNumberOfCoreBytesPerCharacter=1;
        methods.Append(method);
        method.iNumberOfBytesAbleToConvert=NumberOfBytesAbleToConvertToJisX0208;
        method.iConvertToIntermediateBufferInPlace=ConvertToJisX0208FromEucJpPackedInPlace;
        method.iConversionData=&CnvJisX0208::ConversionData();
        method.iNumberOfBytesPerCharacter=2;
        method.iNumberOfCoreBytesPerCharacter=2;
        methods.Append(method);
        method.iNumberOfBytesAbleToConvert=NumberOfBytesAbleToConvertToHalfWidthKatakana8;
        method.iConvertToIntermediateBufferInPlace=ConvertToHalfWidthKatakana8FromEucJpPackedInPlace;
        method.iConversionData=&CnvHalfWidthKatakana8::ConversionData();
        method.iNumberOfBytesPerCharacter=2;
        method.iNumberOfCoreBytesPerCharacter=1;
        methods.Append(method);
        method.iNumberOfBytesAbleToConvert=NumberOfBytesAbleToConvertToJisX0212;
        method.iConvertToIntermediateBufferInPlace=ConvertToJisX0212FromEucJpPackedInPlace;
        method.iConversionData=&CnvJisX0212::ConversionData();
        method.iNumberOfBytesPerCharacter=3;
        method.iNumberOfCoreBytesPerCharacter=2;
        methods.Append(method);
        }
    TInt unconvert = CnvUtilities::ConvertToUnicodeFromHeterogeneousForeign(aDefaultEndiannessOfForeignCharacters, aUnicode, aForeign, aNumberOfUnconvertibleCharacters, aIndexOfFirstByteOfFirstUnconvertibleCharacter, methods.Array());

    // The following is specific impelementation for brower.
    // If brower app calls this API, the yen sign code(0xA5)
    // must be converted to backslash code(0x5C).
    // Becasue Javascript supports backslash code ony.
    TBool browserProcess = (RProcess().SecureId().iId == KBrowserSecureId);
    if (browserProcess && aUnicode.Length() > 0)
        {
        const TUint16* pB = aUnicode.Ptr();
        const TUint16* pbase = pB;
        const TUint16* pE = pB + aUnicode.Length() -1;
        while (pE>=pbase)
            {
            if (*pbase == KCharacterCodeForYenSign)
                {
                aUnicode[pbase - pB] = KCharacterCodeForBackSlash;
                }
            pbase++;
            }
        }

    methods.Close();
    return unconvert;
    }

TBool CEucjpPackedConverterImpl::IsInThisCharacterSetL(
        TBool& aSetToTrue,
        TInt& aConfidenceLevel,
        const TDesC8& aSample)
    {
    aSetToTrue=ETrue;
    // check for the SS2 and SS3 which specifies Code Set 2 & 3 respectively from the Code space
    // between 00-7f only... then ambiguous
    aSetToTrue = ETrue;
    TInt sampleLength = aSample.Length();
    TInt eucjpPacked = 0;
    aConfidenceLevel = 0;

    for (TInt i = 0; i < sampleLength; ++i)
        {
        // Code set 1 JISX 0208 support
        TInt increment1 = i+1;
        if (increment1 >= sampleLength)
            break;
        if (((aSample[i] >= 0xa1) && (aSample[i] <= 0xfe)) &&
            ((aSample[increment1] >= 0xa1) && (aSample[increment1] <= 0xfe)))
            {
            eucjpPacked = eucjpPacked +2;
            i++;
            }
        // Single Shift 2 (SS2) sequence - Code Set 2
        if (aSample[i]==0x8e)
            {
            TInt increment1 = i+1;
            if (increment1 >= sampleLength)
                break;
            if ((aSample[increment1] >= 0xa1) && (aSample[increment1] <= 0xdf))
                {
                eucjpPacked = eucjpPacked+2;
                i++;
                }
            else
                {
                eucjpPacked = 0;
                break;
                }
            }
        // Single Shift 3 (SS3) sequence - Code Set 3
        if (aSample[i]==0x8f)
            {
            TInt increment1 = i+1;
            TInt increment2 = i+2;
            if ((increment1 >= sampleLength) || (increment2 >= sampleLength))
                break;
            if (((aSample[increment1] >= 0xa1) && (aSample[increment1] <= 0xfe)) &&
                ((aSample[increment2] >= 0xa1) && (aSample[increment2] <= 0xfe)))
                {
                eucjpPacked = eucjpPacked +3;
                i+=2;
                }
            else
                {
                eucjpPacked =0;
                break;
                }
            }
        }
    if (eucjpPacked)
        aConfidenceLevel = (eucjpPacked*100)/sampleLength;
    else
        aConfidenceLevel = 0;
    aConfidenceLevel=(aConfidenceLevel >100)?100:aConfidenceLevel;
    return ETrue;
    }

CEucjpPackedConverterImpl* CEucjpPackedConverterImpl::NewL()
    {
    CEucjpPackedConverterImpl* self = new(ELeave) CEucjpPackedConverterImpl();
    CleanupStack::PushL(self);
    self->ConstructL();
    CleanupStack::Pop(self);
    return self;
    }

CEucjpPackedConverterImpl::~CEucjpPackedConverterImpl()
    {
    FeatureManager::UnInitializeLib();    
    }

CEucjpPackedConverterImpl::CEucjpPackedConverterImpl()
    {
    }

void CEucjpPackedConverterImpl::ConstructL()
    {
    FeatureManager::InitializeLibL();
    }

const TImplementationProxy ImplementationTable[] =
    {
#ifdef S60_TEST
    IMPLEMENTATION_PROXY_ENTRY(0x01000005,CEucjpPackedConverterImpl::NewL)
#else
    IMPLEMENTATION_PROXY_ENTRY(0x10006067,CEucjpPackedConverterImpl::NewL)
#endif
    };

EXPORT_C const TImplementationProxy* ImplementationGroupProxy(TInt& aTableCount)
    {
    aTableCount = sizeof(ImplementationTable) / sizeof(TImplementationProxy);

    return ImplementationTable;
    }