svgtopt/nvgdecoder/src/NVGIconData.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 07 Jan 2010 16:19:02 +0200
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/*
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* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  NVG Decoder source file
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 *
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*/
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#include "NVGIconData.h"
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//const TUint KEncodedDataLength        = 1024;
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const TUint KEncodedDataGranularity   = 64;
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CNVGIconData::CNVGIconData()
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    : iNVGData(0),
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    iNVGDataPtr(0, 0),
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    iTotalRead(0),
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    iReadStream(0)
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    {
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    }
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CNVGIconData::~CNVGIconData()
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    {
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    delete iNVGData;
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    }
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CNVGIconData * CNVGIconData::NewL(TInt aLength)
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    {
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    CNVGIconData* self    = CNVGIconData::NewLC(aLength);
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    CleanupStack::Pop(self);
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    return self;
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    }
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CNVGIconData * CNVGIconData::NewLC(TInt aLength)
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    {
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    CNVGIconData* self    = new (ELeave) CNVGIconData;
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    CleanupStack::PushL(self);
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    self->ConstructL(aLength);
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    return self;
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    }
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CNVGIconData * CNVGIconData::NewL(const TDesC8& aBuf)
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    {
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    CNVGIconData* self    = CNVGIconData::NewLC(aBuf);
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    CleanupStack::Pop(self);
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    return self;
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    }
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CNVGIconData * CNVGIconData::NewLC(const TDesC8& aBuf)
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    {
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    CNVGIconData* self    = new (ELeave) CNVGIconData;
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    CleanupStack::PushL(self);
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    self->ConstructL(aBuf);
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    return self;
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    }
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CNVGIconData * CNVGIconData::NewL(TUint8 * aBuf, TInt aLength)
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    {
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    return CNVGIconData::NewL(TPtr8(aBuf, aLength, aLength));
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    }
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CNVGIconData * CNVGIconData::NewLC(TUint8 * aBuf, TInt aLength)
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    {
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    return CNVGIconData::NewLC(TPtr8(aBuf, aLength, aLength));
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    }
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void CNVGIconData::ConstructL(const TDesC8& aBuf)
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    {
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    iNVGDataPtr.Set((TUint8 *)aBuf.Ptr(), aBuf.Length(), aBuf.Length());
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    //set the reading pointers
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    BeginRead();
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    }
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void CNVGIconData::ConstructL(TUint aLength)
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    {    
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    iNVGData = HBufC8::NewL(aLength);
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    iNVGDataPtr = iNVGData->Des();
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    }
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void CNVGIconData::EncodeDataL(const TAny *aData, TUint aLength)
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    {
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    TInt result = KErrNone;
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    TInt encodedDataLength      = iNVGDataPtr.Length() + aLength;
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    TInt encodedDataMaxLength   = iNVGDataPtr.MaxLength();
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    if (encodedDataLength >= encodedDataMaxLength)
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        {
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        result = ExpandEncodedData(encodedDataLength);
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        if (result != KErrNone)
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            {
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            User::Leave(result);
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            }
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        iNVGDataPtr.Append((TUint8*)(aData), aLength);
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        }
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    else
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        {
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        iNVGDataPtr.Append((TUint8*)(aData), aLength);
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        }    
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    }
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   115
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TInt CNVGIconData::EncodeData(const TAny *aData, TUint aLength)
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    {
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    TInt result = KErrNone;
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    TInt encodedDataLength      = iNVGDataPtr.Length() + aLength;
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    TInt encodedDataMaxLength   = iNVGDataPtr.MaxLength();
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    if (encodedDataLength >= encodedDataMaxLength)
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        {
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        result = ExpandEncodedData(encodedDataLength);
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        if (result == KErrNone)
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            {
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            iNVGDataPtr.Append((TUint8*)(aData), aLength);
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            }
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        }
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    else
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        {
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        iNVGDataPtr.Append((TUint8*)(aData), aLength);
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        }
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    return result;
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    }
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TInt CNVGIconData::ExpandEncodedData(TUint aNewLength)
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    {
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    TInt result = KErrNone;
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    TInt encodedDataMaxLength   = iNVGDataPtr.MaxLength();
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    TUint granularities = ((aNewLength - encodedDataMaxLength) / KEncodedDataGranularity) + 1;
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    HBufC8 * tmpBuf = HBufC8::New(encodedDataMaxLength + granularities * KEncodedDataGranularity);
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    if (tmpBuf == 0)
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        {
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        result = KErrNoMemory;
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        }
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    else
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        {
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        TPtr8 tmpBufPtr (tmpBuf->Des());
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        tmpBufPtr.Copy(*iNVGData);
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   155
        
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        delete iNVGData;
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        iNVGData = tmpBuf;
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        iNVGDataPtr.Set(iNVGData->Des());
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   159
        }
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   160
    
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    return result;
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    }
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   163
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void CNVGIconData::BeginRead()
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    {
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    iDataLength = iNVGDataPtr.Length();
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    iTotalRead = 0;
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    iReadStream = (TUint8 *)iNVGDataPtr.Ptr();
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    }
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   170
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void CNVGIconData::EndRead()
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    {
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    }
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   174
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#define STR_TO_OTHER_DIR(TOTYPE) do {\
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                                TOTYPE data = *(TOTYPE *)&iReadStream[iTotalRead];\
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                                iTotalRead += sizeof(TOTYPE);\
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                                return data;\
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                           } while (0)
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   180
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   181
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   182
#define STR_TO_OTHER_IDIR(TOTYPE) do {\
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                                TOTYPE data;\
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                                TUint8 * dataPtr = (TUint8 *)&data;\
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   185
                                for (TInt i = 0; i < sizeof(TOTYPE); ++i)\
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   186
                                    {\
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   187
                                    dataPtr[i] = iReadStream[iTotalRead+i];\
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   188
                                    }\
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   189
                                iTotalRead += sizeof(TOTYPE);\
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   190
                                return data;\
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   191
                            } while (0)
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   192
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   193
#define STR_TO_OTHER(TOTYPE) do {\
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   194
                                CheckOutOfBoundL(sizeof(TOTYPE));\
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   195
                                if (reinterpret_cast<int>(&iReadStream[iTotalRead]) & (sizeof(TOTYPE) - 1))\
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   196
                                    {\
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   197
                                    STR_TO_OTHER_IDIR(TOTYPE);\
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   198
                                    }\
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   199
                                else\
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   200
                                    {\
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   201
                                    STR_TO_OTHER_DIR(TOTYPE);\
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   202
                                    }\
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   203
                            } while (0)
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   204
    
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   205
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TInt16 CNVGIconData::ReadInt16L()
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   207
    {
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   208
    STR_TO_OTHER(TInt16);
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   209
    }
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   210
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   211
TInt32 CNVGIconData::ReadInt32L()
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   212
    {
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   213
    STR_TO_OTHER(TInt32);
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   214
    }
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   215
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   216
TInt8 CNVGIconData::ReadInt8L()
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   217
    {
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   218
    CheckOutOfBoundL(sizeof(TInt8));
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   219
    STR_TO_OTHER_DIR(TInt8);
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   220
    }
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   221
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   222
TReal32 CNVGIconData::ReadReal32L()
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   223
    {
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   224
    STR_TO_OTHER(TReal32);
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   225
    }
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TReal64 CNVGIconData::ReadReal64L()
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    {
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    CheckOutOfBoundL(sizeof(TReal64));
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    STR_TO_OTHER_IDIR(TReal64);
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    }
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void CNVGIconData::ReadL(TDes8 &aDes, TInt aLength)
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    {
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    CheckOutOfBoundL(aLength);
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    aDes.Copy(&iReadStream[iTotalRead], aLength);
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    iTotalRead += aLength;
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    }
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void CNVGIconData::ReadL(TUint8 *aPtr, TInt aLength)
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    {
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    CheckOutOfBoundL(aLength);
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    memcpy(aPtr, &iReadStream[iTotalRead], aLength);
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    iTotalRead += aLength;
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    }
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void CNVGIconData::SkipL(TInt aLength)
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    {
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    CheckOutOfBoundL(aLength);
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    iTotalRead += aLength;
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    }