/******************************************************************************
 *
 * Project:  RPF TOC read Translator
 * Purpose:  Implementation of RPFTOCDataset and RPFTOCSubDataset.
 * Author:   Even Rouault, even.rouault at mines-paris.org
 *
 ******************************************************************************
 * Copyright (c) 2007-2014, Even Rouault <even dot rouault at mines-paris dot org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#include "cpl_port.h"
#include "rpftoclib.h"

#include <cmath>
#include <cstdio>
#include <cstring>

#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_multiproc.h"
#include "cpl_string.h"
#include "cpl_vsi.h"
#include "gdal.h"
#include "gdal_frmts.h"
#include "gdal_pam.h"
#include "gdal_priv.h"
#include "gdal_proxy.h"
#include "ogr_spatialref.h"
#include "nitflib.h"
#include "vrtdataset.h"

CPL_CVSID("$Id: rpftocdataset.cpp 002b050d9a9ef403a732c1210784736ef97216d4 2018-04-09 21:34:55 +0200 Even Rouault $")

constexpr int GEOTRSFRM_TOPLEFT_X = 0;
constexpr int GEOTRSFRM_WE_RES = 1;
constexpr int GEOTRSFRM_ROTATION_PARAM1 = 2;
constexpr int GEOTRSFRM_TOPLEFT_Y = 3;
constexpr int GEOTRSFRM_ROTATION_PARAM2 = 4;
constexpr int GEOTRSFRM_NS_RES = 5;

/** Overview of used classes :
   - RPFTOCDataset : lists the different subdatasets, listed in the A.TOC,
                     as subdatasets
   - RPFTOCSubDataset : one of these subdatasets, implemented as a VRT, of
                        the relevant NITF tiles
   - RPFTOCProxyRasterDataSet : a "proxy" dataset that maps to a NITF tile
   - RPFTOCProxyRasterBandPalette / RPFTOCProxyRasterBandRGBA : bands of RPFTOCProxyRasterDataSet
*/

/************************************************************************/
/* ==================================================================== */
/*                            RPFTOCDataset                             */
/* ==================================================================== */
/************************************************************************/

class RPFTOCDataset : public GDALPamDataset
{
  char      **papszSubDatasets;
  char       *pszProjection;
  int         bGotGeoTransform;
  double      adfGeoTransform[6];

  char      **papszFileList;

  public:
    RPFTOCDataset() :
        papszSubDatasets(nullptr),
        pszProjection(nullptr),
        bGotGeoTransform(FALSE),
        papszFileList(nullptr)
    {
        memset( adfGeoTransform, 0, sizeof(adfGeoTransform) );
    }

    virtual ~RPFTOCDataset()
    {
        CSLDestroy( papszSubDatasets );
        CPLFree( pszProjection );
        CSLDestroy( papszFileList );
    }

    virtual char      **GetMetadata( const char * pszDomain = "" ) override;

    virtual char      **GetFileList() override { return CSLDuplicate(papszFileList); }

    void                AddSubDataset(const char* pszFilename, RPFTocEntry* tocEntry );

    void SetSize(int rasterXSize, int rasterYSize)
    {
        nRasterXSize = rasterXSize;
        nRasterYSize = rasterYSize;
    }

    virtual CPLErr GetGeoTransform( double * padfGeoTransform) override
    {
        if (bGotGeoTransform)
        {
            memcpy(padfGeoTransform, adfGeoTransform, 6 * sizeof(double));
            return CE_None;
        }
        return CE_Failure;
    }

    virtual CPLErr SetGeoTransform( double * padfGeoTransform) override
    {
        bGotGeoTransform = TRUE;
        memcpy(adfGeoTransform, padfGeoTransform, 6 * sizeof(double));
        return CE_None;
    }

    virtual CPLErr SetProjection( const char * projectionRef ) override
    {
        CPLFree(pszProjection);
        pszProjection = CPLStrdup(projectionRef);
        return CE_None;
    }

    virtual const char *GetProjectionRef(void) override
    {
        return (pszProjection) ? pszProjection : "";
    }

    static int IsNITFFileTOC(NITFFile *psFile);
    static int IsNonNITFFileTOC(GDALOpenInfo * poOpenInfo, const char* pszFilename );
    static GDALDataset* OpenFileTOC(NITFFile *psFile,
                                    const char* pszFilename,
                                    const char* entryName,
                                    const char* openInformationName);

    static int Identify( GDALOpenInfo * poOpenInfo );
    static GDALDataset* Open( GDALOpenInfo * poOpenInfo );
};

/************************************************************************/
/* ==================================================================== */
/*                            RPFTOCSubDataset                          */
/* ==================================================================== */
/************************************************************************/

class RPFTOCSubDataset : public VRTDataset
{

  int          cachedTileBlockXOff;
  int          cachedTileBlockYOff;
  void*        cachedTileData;
  int          cachedTileDataSize;
  const char*  cachedTileFileName;
  char**       papszFileList;

  public:
    RPFTOCSubDataset(int nXSize, int nYSize) :
        VRTDataset(nXSize, nYSize),
        cachedTileBlockXOff(-1),
        cachedTileBlockYOff(-1),
        cachedTileData(nullptr),
        cachedTileDataSize(0),
        cachedTileFileName(nullptr),
        papszFileList(nullptr)
    {
        /* Don't try to write a VRT file */
        SetWritable(FALSE);

        /* The driver is set to VRT in VRTDataset constructor. */
        /* We have to set it to the expected value ! */
        poDriver = reinterpret_cast<GDALDriver *>(
            GDALGetDriverByName( "RPFTOC" ) );
    }

    virtual ~RPFTOCSubDataset()
    {
        CSLDestroy(papszFileList);
        CPLFree(cachedTileData);
    }

    virtual char      **GetFileList() override { return CSLDuplicate(papszFileList); }

    void* GetCachedTile(const char* tileFileName, int nBlockXOff, int nBlockYOff)
    {
        if (cachedTileFileName == tileFileName  &&
            cachedTileBlockXOff == nBlockXOff &&
            cachedTileBlockYOff == nBlockYOff)
        {
            return cachedTileData;
        }

        return nullptr;
    }

    void SetCachedTile(const char* tileFileName, int nBlockXOff, int nBlockYOff,
                       const void* pData, int dataSize)
    {
        if (cachedTileData == nullptr || dataSize > cachedTileDataSize)
        {
            cachedTileData = CPLRealloc(cachedTileData, dataSize);
            cachedTileDataSize = dataSize;
        }
        memcpy(cachedTileData, pData, dataSize);
        cachedTileFileName = tileFileName;
        cachedTileBlockXOff = nBlockXOff;
        cachedTileBlockYOff = nBlockYOff;
    }

    static GDALDataset* CreateDataSetFromTocEntry(const char* openInformationName,
                                                  const char* pszTOCFileName, int nEntry,
                                                  const RPFTocEntry* entry, int isRGBA,
                                                  char** papszMetadataRPFTOCFile);
};

/************************************************************************/
/* ==================================================================== */
/*                        RPFTOCProxyRasterDataSet                       */
/* ==================================================================== */
/************************************************************************/

class RPFTOCProxyRasterDataSet : public GDALProxyPoolDataset
{
    /* The following parameters are only for sanity checking */
    int checkDone;
    int checkOK;
    double nwLong;
    double nwLat;
    GDALColorTable* colorTableRef;
    int bHasNoDataValue;
    double noDataValue;
    RPFTOCSubDataset* subdataset;

    public:
        RPFTOCProxyRasterDataSet(RPFTOCSubDataset* subdataset,
                                 const char* fileName,
                                 int nRasterXSize, int nRasterYSize,
                                 int nBlockXSize, int nBlockYSize,
                                 const char* projectionRef, double nwLong, double nwLat,
                                 int nBands);

        void SetNoDataValue(double noDataValueIn) {
            this->noDataValue = noDataValueIn;
            bHasNoDataValue = TRUE;
        }

        double GetNoDataValue(int* pbHasNoDataValue)
        {
            if (pbHasNoDataValue)
                *pbHasNoDataValue = this->bHasNoDataValue;
            return noDataValue;
        }

        GDALDataset* RefUnderlyingDataset() override
        {
            return GDALProxyPoolDataset::RefUnderlyingDataset();
        }

        void UnrefUnderlyingDataset(GDALDataset* poUnderlyingDataset) override
        {
            GDALProxyPoolDataset::UnrefUnderlyingDataset(poUnderlyingDataset);
        }

        void SetReferenceColorTable(GDALColorTable* colorTableRefIn) { this->colorTableRef = colorTableRefIn;}

        const GDALColorTable* GetReferenceColorTable() const { return colorTableRef; }

        int SanityCheckOK(GDALDataset* sourceDS);

        RPFTOCSubDataset* GetSubDataset() { return subdataset; }
};

/************************************************************************/
/* ==================================================================== */
/*                     RPFTOCProxyRasterBandRGBA                        */
/* ==================================================================== */
/************************************************************************/

class RPFTOCProxyRasterBandRGBA : public GDALPamRasterBand
{
    int initDone;
    unsigned char colorTable[256];
    int blockByteSize;

    private:
        void Expand(void* pImage, const void* srcImage);

    public:
        RPFTOCProxyRasterBandRGBA( GDALProxyPoolDataset* poDSIn, int nBandIn,
                                   int nBlockXSizeIn, int nBlockYSizeIn):
            initDone(FALSE)
        {
            this->poDS = poDSIn;
            nRasterXSize = poDSIn->GetRasterXSize();
            nRasterYSize = poDSIn->GetRasterYSize();
            this->nBlockXSize = nBlockXSizeIn;
            this->nBlockYSize = nBlockYSizeIn;
            eDataType = GDT_Byte;
            this->nBand = nBandIn;
            blockByteSize = nBlockXSize * nBlockYSize;
            memset( colorTable, 0, sizeof(colorTable) );
        }
        virtual ~RPFTOCProxyRasterBandRGBA() {}

        virtual GDALColorInterp GetColorInterpretation() override
        {
            return (GDALColorInterp)(GCI_RedBand + nBand - 1);
        }

    protected:
        virtual CPLErr IReadBlock( int nBlockXOff, int nBlockYOff,
                                   void * pImage ) override;
};

/************************************************************************/
/*                    Expand()                                          */
/************************************************************************/

/* Expand the  array or indexed colors to an array of their corresponding R,G,B or A component */
void  RPFTOCProxyRasterBandRGBA::Expand(void* pImage, const void* srcImage)
{
    if ((blockByteSize & (~3)) != 0)
    {
        for( int i = 0; i < blockByteSize; i++ )
        {
            ((unsigned char*)pImage)[i] = colorTable[((unsigned char*)srcImage)[i]];
        }
    }
    else
    {
        int nIter = blockByteSize/4;
        for( int i = 0; i < nIter; i++ )
        {
            unsigned int four_pixels = ((unsigned int*)srcImage)[i];
            ((unsigned int*)pImage)[i] =
                    (colorTable[four_pixels >> 24] << 24) |
                    (colorTable[(four_pixels >> 16) & 0xFF] << 16) |
                    (colorTable[(four_pixels >> 8) & 0xFF] << 8) |
                    colorTable[four_pixels & 0xFF];
        }
    }
}

/************************************************************************/
/*                    IReadBlock()                                      */
/************************************************************************/

CPLErr RPFTOCProxyRasterBandRGBA::IReadBlock( int nBlockXOff, int nBlockYOff,
                                         void * pImage )
{
    CPLErr ret;
    RPFTOCProxyRasterDataSet* proxyDS
        = reinterpret_cast<RPFTOCProxyRasterDataSet *>( poDS );

    GDALDataset* ds = proxyDS->RefUnderlyingDataset();
    if (ds)
    {
        if (proxyDS->SanityCheckOK(ds) == FALSE)
        {
            proxyDS->UnrefUnderlyingDataset(ds);
            return CE_Failure;
        }

        GDALRasterBand* srcBand = ds->GetRasterBand(1);
        if (initDone == FALSE)
        {
            GDALColorTable* srcColorTable = srcBand->GetColorTable();
            int bHasNoDataValue;
            int noDataValue = static_cast<int>(
                srcBand->GetNoDataValue(&bHasNoDataValue) );
            const int nEntries = srcColorTable->GetColorEntryCount();
            for( int i = 0; i < nEntries; i++ )
            {
                const GDALColorEntry* entry = srcColorTable->GetColorEntry(i);
                if (nBand == 1)
                    colorTable[i] = (unsigned char)entry->c1;
                else if (nBand == 2)
                    colorTable[i] = (unsigned char)entry->c2;
                else if (nBand == 3)
                    colorTable[i] = (unsigned char)entry->c3;
                else
                {
                    colorTable[i] = (bHasNoDataValue && i == noDataValue) ? 0 : (unsigned char)entry->c4;
                }
            }
            if (bHasNoDataValue && nEntries == noDataValue)
                colorTable[nEntries] = 0;
            initDone = TRUE;
        }

        /* We use a 1-tile cache as the same source tile will be consecutively asked for */
        /* computing the R tile, the G tile, the B tile and the A tile */
        void* cachedImage =
                proxyDS->GetSubDataset()->GetCachedTile(GetDescription(), nBlockXOff, nBlockYOff);
        if (cachedImage == nullptr)
        {
            CPLDebug("RPFTOC", "Read (%d, %d) of band %d, of file %s",
                     nBlockXOff, nBlockYOff, nBand, GetDescription());
            ret = srcBand->ReadBlock(nBlockXOff, nBlockYOff, pImage);
            if (ret == CE_None)
            {
                proxyDS->GetSubDataset()->SetCachedTile
                        (GetDescription(), nBlockXOff, nBlockYOff, pImage, blockByteSize);
                Expand(pImage, pImage);
            }

            /* -------------------------------------------------------------- */
            /*  Forcibly load the other bands associated with this scanline.  */
            /* -------------------------------------------------------------- */
            if( nBand == 1 )
            {
                GDALRasterBlock *poBlock
                    = poDS->GetRasterBand(2)->GetLockedBlockRef(nBlockXOff,nBlockYOff);
                if (poBlock)
                    poBlock->DropLock();

                poBlock =
                    poDS->GetRasterBand(3)->GetLockedBlockRef(nBlockXOff,nBlockYOff);
                if (poBlock)
                    poBlock->DropLock();

                poBlock =
                    poDS->GetRasterBand(4)->GetLockedBlockRef(nBlockXOff,nBlockYOff);
                if (poBlock)
                    poBlock->DropLock();
            }
        }
        else
        {
            Expand(pImage, cachedImage);
            ret = CE_None;
        }
    }
    else
    {
        ret = CE_Failure;
    }

    proxyDS->UnrefUnderlyingDataset(ds);

    return ret;
}

/************************************************************************/
/* ==================================================================== */
/*                 RPFTOCProxyRasterBandPalette                         */
/* ==================================================================== */
/************************************************************************/

class RPFTOCProxyRasterBandPalette : public GDALPamRasterBand
{
    int initDone;
    int blockByteSize;
    int samePalette;
    unsigned char remapLUT[256];

    public:
        RPFTOCProxyRasterBandPalette(GDALProxyPoolDataset* poDSIn, int nBandIn,
                                     int nBlockXSizeIn, int nBlockYSizeIn) :
            initDone(FALSE),
            blockByteSize(nBlockXSizeIn * nBlockYSizeIn),
            samePalette(0)
        {
            this->poDS = poDSIn;
            nRasterXSize = poDSIn->GetRasterXSize();
            nRasterYSize = poDSIn->GetRasterYSize();
            this->nBlockXSize = nBlockXSizeIn;
            this->nBlockYSize = nBlockYSizeIn;
            eDataType = GDT_Byte;
            this->nBand = nBandIn;
            memset( remapLUT, 0, sizeof(remapLUT) );
        }

        virtual GDALColorInterp GetColorInterpretation() override
        {
            return GCI_PaletteIndex;
        }

        virtual double GetNoDataValue(int* bHasNoDataValue) override
        {
            return ( reinterpret_cast<RPFTOCProxyRasterDataSet *>( poDS ) )->GetNoDataValue(bHasNoDataValue);
        }

        virtual GDALColorTable *GetColorTable() override
        {
            // TODO: This casting is a bit scary.
            return const_cast<GDALColorTable *>(
                reinterpret_cast<RPFTOCProxyRasterDataSet *>( poDS )->GetReferenceColorTable() );
        }

    protected:
        virtual CPLErr IReadBlock( int nBlockXOff, int nBlockYOff,
                                   void * pImage ) override;
};

/************************************************************************/
/*                    IReadBlock()                                      */
/************************************************************************/

CPLErr RPFTOCProxyRasterBandPalette::IReadBlock( int nBlockXOff, int nBlockYOff,
                                                 void * pImage )
{
    CPLErr ret;
    RPFTOCProxyRasterDataSet* proxyDS
        = reinterpret_cast<RPFTOCProxyRasterDataSet *>( poDS );
    GDALDataset* ds = proxyDS->RefUnderlyingDataset();
    if (ds)
    {
        if (proxyDS->SanityCheckOK(ds) == FALSE)
        {
            proxyDS->UnrefUnderlyingDataset(ds);
            return CE_Failure;
        }

        GDALRasterBand* srcBand = ds->GetRasterBand(1);
        ret = srcBand->ReadBlock(nBlockXOff, nBlockYOff, pImage);

        if (initDone == FALSE)
        {
            int approximateMatching;
            if (srcBand->GetIndexColorTranslationTo(this, remapLUT, &approximateMatching ))
            {
                samePalette = FALSE;
                if (approximateMatching)
                {
                    CPLError( CE_Failure, CPLE_AppDefined,
                              "Palette for %s is different from reference palette. "
                              "Coudln't remap exactly all colors. Trying to find closest matches.\n", GetDescription());
                }
            }
            else
            {
                samePalette = TRUE;
            }
            initDone = TRUE;
        }

        if (samePalette == FALSE)
        {
            unsigned char* data = (unsigned char*)pImage;
            for( int i = 0; i < blockByteSize; i++ )
            {
                data[i] = remapLUT[data[i]];
            }
        }
    }
    else
    {
        ret = CE_Failure;
    }

    proxyDS->UnrefUnderlyingDataset(ds);

    return ret;
}

/************************************************************************/
/*                    RPFTOCProxyRasterDataSet()                         */
/************************************************************************/

RPFTOCProxyRasterDataSet::RPFTOCProxyRasterDataSet(
    RPFTOCSubDataset* subdatasetIn,
    const char* fileNameIn,
    int nRasterXSizeIn, int nRasterYSizeIn,
    int nBlockXSizeIn, int nBlockYSizeIn,
    const char* projectionRefIn, double nwLongIn, double nwLatIn,
    int nBandsIn ) :
    // Mark as shared since the VRT will take several references if we are in
    // RGBA mode (4 bands for this dataset).
    GDALProxyPoolDataset(fileNameIn, nRasterXSizeIn, nRasterYSizeIn,
                         GA_ReadOnly, TRUE, projectionRefIn),
    checkDone(FALSE),
    checkOK(FALSE),
    nwLong(nwLongIn),
    nwLat(nwLatIn),
    colorTableRef(nullptr),
    bHasNoDataValue(FALSE),
    noDataValue(0),
    subdataset(subdatasetIn)
{
    if (nBandsIn == 4)
    {
        for( int i = 0; i < 4; i++ )
        {
            SetBand(
                i + 1,
                new RPFTOCProxyRasterBandRGBA(this, i+1,
                                              nBlockXSizeIn, nBlockYSizeIn));
        }
    }
    else
    {
        SetBand(
            1,
            new RPFTOCProxyRasterBandPalette(this, 1,
                                             nBlockXSizeIn, nBlockYSizeIn));
    }
}

/************************************************************************/
/*                    SanityCheckOK()                                   */
/************************************************************************/

#define WARN_ON_FAIL(x) do { if (!(x)) { \
    CPLError(CE_Warning, CPLE_AppDefined, \
             "For %s, assert '" #x "' failed", \
             GetDescription()); } } while( false )
#define ERROR_ON_FAIL(x) do { if (!(x)) { \
    CPLError(CE_Warning, CPLE_AppDefined, \
             "For %s, assert '" #x "' failed", \
             GetDescription()); checkOK = FALSE; } } while( false )

int RPFTOCProxyRasterDataSet::SanityCheckOK(GDALDataset* sourceDS)
{
    if (checkDone)
        return checkOK;

    int src_nBlockXSize;
    int src_nBlockYSize;
    int nBlockXSize;
    int nBlockYSize;
    double l_adfGeoTransform[6] = {};

    checkOK = TRUE;
    checkDone = TRUE;

    sourceDS->GetGeoTransform(l_adfGeoTransform);
    WARN_ON_FAIL(fabs(l_adfGeoTransform[GEOTRSFRM_TOPLEFT_X] - nwLong) < l_adfGeoTransform[1] );
    WARN_ON_FAIL(fabs(l_adfGeoTransform[GEOTRSFRM_TOPLEFT_Y] - nwLat) < fabs(l_adfGeoTransform[5]) );
    WARN_ON_FAIL(l_adfGeoTransform[GEOTRSFRM_ROTATION_PARAM1] == 0 &&
                  l_adfGeoTransform[GEOTRSFRM_ROTATION_PARAM2] == 0); /* No rotation */
    ERROR_ON_FAIL(sourceDS->GetRasterCount() == 1); /* Just 1 band */
    ERROR_ON_FAIL(sourceDS->GetRasterXSize() == nRasterXSize);
    ERROR_ON_FAIL(sourceDS->GetRasterYSize() == nRasterYSize);
    WARN_ON_FAIL(EQUAL(sourceDS->GetProjectionRef(), GetProjectionRef()));
    sourceDS->GetRasterBand(1)->GetBlockSize(&src_nBlockXSize, &src_nBlockYSize);
    GetRasterBand(1)->GetBlockSize(&nBlockXSize, &nBlockYSize);
    ERROR_ON_FAIL(src_nBlockXSize == nBlockXSize);
    ERROR_ON_FAIL(src_nBlockYSize == nBlockYSize);
    WARN_ON_FAIL(sourceDS->GetRasterBand(1)->GetColorInterpretation() == GCI_PaletteIndex);
    WARN_ON_FAIL(sourceDS->GetRasterBand(1)->GetRasterDataType() == GDT_Byte);

    return checkOK;
}

/************************************************************************/
/*                           MakeTOCEntryName()                         */
/************************************************************************/

static const char* MakeTOCEntryName(RPFTocEntry* tocEntry )
{
    char* str = nullptr;
    if (tocEntry->seriesAbbreviation)
        str = const_cast<char *>(
            CPLSPrintf( "%s_%s_%s_%s_%d", tocEntry->type,
                        tocEntry->seriesAbbreviation, tocEntry->scale,
                        tocEntry->zone, tocEntry->boundaryId ) );
    else
        str = const_cast<char *>(
            CPLSPrintf( "%s_%s_%s_%d", tocEntry->type, tocEntry->scale,
                        tocEntry->zone, tocEntry->boundaryId ) );
    char* c = str;
    while(*c)
    {
        if (*c == ':' || *c == ' ')
            *c = '_';
        c++;
    }
    return str;
}

/************************************************************************/
/*                           AddSubDataset()                            */
/************************************************************************/

void RPFTOCDataset::AddSubDataset( const char* pszFilename,  RPFTocEntry* tocEntry )

{
    char szName[80];
    const int nCount = CSLCount(papszSubDatasets ) / 2;

    snprintf( szName, sizeof(szName), "SUBDATASET_%d_NAME", nCount+1 );
    papszSubDatasets =
        CSLSetNameValue( papszSubDatasets, szName,
              CPLSPrintf( "NITF_TOC_ENTRY:%s:%s", MakeTOCEntryName(tocEntry), pszFilename ) );

    snprintf( szName, sizeof(szName), "SUBDATASET_%d_DESC", nCount+1 );
    if (tocEntry->seriesName && tocEntry->seriesAbbreviation)
        papszSubDatasets =
        CSLSetNameValue( papszSubDatasets, szName,
               CPLSPrintf( "%s:%s:%s:%s:%s:%d", tocEntry->type, tocEntry->seriesAbbreviation, tocEntry->seriesName, tocEntry->scale, tocEntry->zone, tocEntry->boundaryId ));
    else
        papszSubDatasets =
            CSLSetNameValue( papszSubDatasets, szName,
                CPLSPrintf( "%s:%s:%s:%d", tocEntry->type, tocEntry->scale, tocEntry->zone, tocEntry->boundaryId ));
}

/************************************************************************/
/*                            GetMetadata()                             */
/************************************************************************/

char **RPFTOCDataset::GetMetadata( const char *pszDomain )

{
    if( pszDomain != nullptr && EQUAL(pszDomain,"SUBDATASETS") )
        return papszSubDatasets;

    return GDALPamDataset::GetMetadata( pszDomain );
}

/************************************************************************/
/*                  NITFCreateVRTDataSetFromTocEntry()                  */
/************************************************************************/

#define ASSERT_CREATE_VRT(x) do { if (!(x)) { \
    CPLError(CE_Failure, CPLE_AppDefined, \
             "For %s, assert '" #x "' failed", \
             entry->frameEntries[i].fullFilePath); \
    if (poSrcDS) GDALClose(poSrcDS); CPLFree(projectionRef); \
    return nullptr;} } while( false )

/* Builds a RPFTOCSubDataset from the set of files of the toc entry */
GDALDataset *
RPFTOCSubDataset::CreateDataSetFromTocEntry( const char* openInformationName,
                                             const char* pszTOCFileName,
                                             int nEntry,
                                             const RPFTocEntry* entry,
                                             int isRGBA,
                                             char** papszMetadataRPFTOCFile)
{
    GDALDriver *poDriver = GetGDALDriverManager()->GetDriverByName("VRT");
    if( poDriver == nullptr )
        return nullptr;

    const int N = entry->nVertFrames * entry->nHorizFrames;

    /* This may not be reliable. See below */
    int sizeX = static_cast<int>(
        (entry->seLong - entry->nwLong)
        / (entry->nHorizFrames * entry->horizInterval) + 0.5);

    const int sizeY = static_cast<int>(
        (entry->nwLat - entry->seLat)
        / (entry->nVertFrames * entry->vertInterval) + 0.5);

    int nBlockXSize = 0;
    int nBlockYSize = 0;
    double geoTransf[6] = {};
    char* projectionRef = nullptr;
    int index = 0;

    for( int i = 0; i < N; i++ )
    {
        if (!entry->frameEntries[i].fileExists)
            continue;

        if (index == 0)
        {
            /* Open the first available file to get its geotransform, projection ref and block size */
            /* Do a few sanity checks too */
            /* Ideally we should make these sanity checks now on ALL files, but it would be too slow */
            /* for large datasets. So these sanity checks will be done at the time we really need */
            /* to access the file (see SanityCheckOK metho) */
            GDALDataset *poSrcDS = reinterpret_cast<GDALDataset *>(
                GDALOpenShared( entry->frameEntries[i].fullFilePath,
                                GA_ReadOnly ) );
            ASSERT_CREATE_VRT(poSrcDS);
            poSrcDS->GetGeoTransform(geoTransf);
            projectionRef = CPLStrdup(poSrcDS->GetProjectionRef());
            ASSERT_CREATE_VRT(geoTransf[GEOTRSFRM_ROTATION_PARAM1] == 0 &&
                              geoTransf[GEOTRSFRM_ROTATION_PARAM2] == 0); /* No rotation */
            ASSERT_CREATE_VRT(poSrcDS->GetRasterCount() == 1); /* Just 1 band */

            /* Tolerance of 1%... This is necessary for CADRG_L22/RPF/A.TOC for example */
            ASSERT_CREATE_VRT((entry->horizInterval - geoTransf[GEOTRSFRM_WE_RES]) /
                                entry->horizInterval < 0.01); /* X interval same as in TOC */
            ASSERT_CREATE_VRT((entry->vertInterval - (-geoTransf[GEOTRSFRM_NS_RES])) /
                                entry->horizInterval < 0.01); /* Y interval same as in TOC */

            const int ds_sizeX = poSrcDS->GetRasterXSize();
            const int ds_sizeY = poSrcDS->GetRasterYSize();
            /* In the case the east longitude is 180, there's a great chance that it is in fact */
            /* truncated in the A.TOC. Thus, the only reliable way to find out the tile width, is to */
            /* read it from the tile dataset itself... */
            /* This is the case for the GNCJNCN dataset that has world coverage */
            if (entry->seLong == 180.00)
                sizeX = ds_sizeX;
            else
                ASSERT_CREATE_VRT(sizeX == ds_sizeX);
            ASSERT_CREATE_VRT(sizeY == ds_sizeY);
            poSrcDS->GetRasterBand(1)->GetBlockSize(&nBlockXSize, &nBlockYSize);
            ASSERT_CREATE_VRT(poSrcDS->GetRasterBand(1)->GetColorInterpretation() == GCI_PaletteIndex);
            ASSERT_CREATE_VRT(poSrcDS->GetRasterBand(1)->GetRasterDataType() == GDT_Byte);
            GDALClose(poSrcDS);
        }

        index++;
    }

    if (index == 0)
        return nullptr;

    /* ------------------------------------ */
    /* Create the VRT with the overall size */
    /* ------------------------------------ */
    RPFTOCSubDataset *poVirtualDS
        = new RPFTOCSubDataset( sizeX * entry->nHorizFrames,
                                sizeY * entry->nVertFrames);

    if (papszMetadataRPFTOCFile)
        poVirtualDS->SetMetadata(papszMetadataRPFTOCFile);

    poVirtualDS->SetProjection(projectionRef);

    geoTransf[GEOTRSFRM_TOPLEFT_X] = entry->nwLong;
    geoTransf[GEOTRSFRM_TOPLEFT_Y] = entry->nwLat;
    poVirtualDS->SetGeoTransform(geoTransf);

    int nBands;

    /* In most cases, all the files inside a TOC entry share the same */
    /* palette and we could use it for the VRT. */
    /* In other cases like for CADRG801_France_250K (TOC entry CADRG_250K_2_2), */
    /* the file for Corsica and the file for Sardegna do not share the same palette */
    /* however they contain the same RGB triplets and are just ordered differently */
    /* So we can use the same palette */
    /* In the unlikely event where palettes would be incompatible, we can use the RGBA */
    /* option through the config option RPFTOC_FORCE_RGBA */
    if (isRGBA == FALSE)
    {
        poVirtualDS->AddBand(GDT_Byte, nullptr);
        GDALRasterBand *poBand = poVirtualDS->GetRasterBand( 1 );
        poBand->SetColorInterpretation(GCI_PaletteIndex);
        nBands = 1;

        for( int i = 0; i < N; i++ )
        {
            if (!entry->frameEntries[i].fileExists)
                continue;

            bool bAllBlack = true;
            GDALDataset *poSrcDS = reinterpret_cast<GDALDataset *>(
                GDALOpenShared( entry->frameEntries[i].fullFilePath,
                                GA_ReadOnly ) );
            if( poSrcDS != nullptr )
            {
                if( poSrcDS->GetRasterCount() == 1 )
                {
                    int bHasNoDataValue;
                    const double noDataValue = poSrcDS->GetRasterBand(1)->GetNoDataValue(&bHasNoDataValue);
                    if (bHasNoDataValue)
                        poBand->SetNoDataValue(noDataValue);

                    /* Avoid setting a color table that is all black (which might be */
                    /* the case of the edge tiles of a RPF subdataset) */
                    GDALColorTable* poCT = poSrcDS->GetRasterBand(1)->GetColorTable();
                    if( poCT != nullptr )
                    {
                        for(int iC = 0; iC < poCT->GetColorEntryCount(); iC++)
                        {
                            if( bHasNoDataValue &&
                                iC == static_cast<int>( noDataValue ) )
                                continue;

                            const GDALColorEntry* psColorEntry = poCT->GetColorEntry(iC);
                            if( psColorEntry->c1 != 0 || psColorEntry->c2 != 0 || psColorEntry->c3 != 0)
                            {
                                bAllBlack = false;
                                break;
                            }
                        }

                        /* Assign it temporarily, in the hope of a better match */
                        /* afterwards */
                        poBand->SetColorTable(poCT);
                        if( bAllBlack )
                        {
                            CPLDebug("RPFTOC",
                                     "Skipping %s. Its palette is all black.",
                                     poSrcDS->GetDescription());
                        }
                    }
                }
                GDALClose(poSrcDS);
            }
            if( !bAllBlack )
                break;
        }
    }
    else
    {
        for( int i = 0; i < 4; i++ )
        {
            poVirtualDS->AddBand(GDT_Byte, nullptr);
            GDALRasterBand *poBand = poVirtualDS->GetRasterBand( i + 1 );
            poBand->SetColorInterpretation((GDALColorInterp)(GCI_RedBand+i));
        }
        nBands = 4;
    }

    CPLFree(projectionRef);
    projectionRef = nullptr;

    /* -------------------------------------------------------------------- */
    /*      Check for overviews.                                            */
    /* -------------------------------------------------------------------- */

    poVirtualDS->oOvManager.Initialize( poVirtualDS,
                                        CPLString().Printf("%s.%d", pszTOCFileName, nEntry + 1));

    poVirtualDS->SetDescription(pszTOCFileName);
    poVirtualDS->papszFileList = poVirtualDS->GDALDataset::GetFileList();
    poVirtualDS->SetDescription(openInformationName);

    int iFile = 0;
    for( int i = 0; i < N; i++ )
    {
        if (! entry->frameEntries[i].fileExists)
            continue;

        poVirtualDS->SetMetadataItem(CPLSPrintf("FILENAME_%d", iFile), entry->frameEntries[i].fullFilePath);
        poVirtualDS->papszFileList = CSLAddString(poVirtualDS->papszFileList, entry->frameEntries[i].fullFilePath);
        iFile++;

        /* We create proxy datasets and raster bands */
        /* Using real datasets and raster bands is possible in theory */
        /* However for large datasets, a TOC entry can include several hundreds of files */
        /* and we finally reach the limit of maximum file descriptors open at the same time ! */
        /* So the idea is to warp the datasets into a proxy and open the underlying dataset only when it is */
        /* needed (IRasterIO operation). To improve a bit efficiency, we have a cache of opened */
        /* underlying datasets */
        RPFTOCProxyRasterDataSet* ds = new RPFTOCProxyRasterDataSet(
            reinterpret_cast<RPFTOCSubDataset *>( poVirtualDS ),
            entry->frameEntries[i].fullFilePath,
            sizeX, sizeY,
            nBlockXSize, nBlockYSize,
            poVirtualDS->GetProjectionRef(),
            entry->nwLong + entry->frameEntries[i].frameCol * entry->horizInterval * sizeX,
            entry->nwLat - entry->frameEntries[i].frameRow * entry->vertInterval * sizeY,
            nBands);

        if (nBands == 1)
        {
            GDALRasterBand *poBand = poVirtualDS->GetRasterBand( 1 );
            ds->SetReferenceColorTable(poBand->GetColorTable());
            int bHasNoDataValue;
            const double noDataValue = poBand->GetNoDataValue(&bHasNoDataValue);
            if (bHasNoDataValue)
                ds->SetNoDataValue(noDataValue);
        }

        for( int j = 0; j < nBands; j++ )
        {
            VRTSourcedRasterBand *poBand =
                reinterpret_cast<VRTSourcedRasterBand *>(
                    poVirtualDS->GetRasterBand( j + 1 ) );
            /* Place the raster band at the right position in the VRT */
            poBand->AddSimpleSource(ds->GetRasterBand(j + 1),
                                    0, 0, sizeX, sizeY,
                                    entry->frameEntries[i].frameCol * sizeX,
                                    entry->frameEntries[i].frameRow * sizeY,
                                    sizeX, sizeY);
        }

        /* The RPFTOCProxyRasterDataSet will be destroyed when its last raster band will be */
        /* destroyed */
        ds->Dereference();
    }

    poVirtualDS->SetMetadataItem("NITF_SCALE", entry->scale);
    poVirtualDS->SetMetadataItem("NITF_SERIES_ABBREVIATION",
                        (entry->seriesAbbreviation) ? entry->seriesAbbreviation : "Unknown");
    poVirtualDS->SetMetadataItem("NITF_SERIES_NAME",
                        (entry->seriesName) ? entry->seriesName : "Unknown");

    return poVirtualDS;
}

/************************************************************************/
/*                          IsNonNITFFileTOC()                          */
/************************************************************************/

/* Check whether the file is a TOC file without NITF header */
int RPFTOCDataset::IsNonNITFFileTOC(GDALOpenInfo * poOpenInfo, const char* pszFilename )
{
    const char pattern[] = { 0, 0, '0', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'A', '.', 'T', 'O', 'C' };
    if (poOpenInfo)
    {
        if (poOpenInfo->nHeaderBytes < 48 )
            return FALSE;
        return memcmp(pattern, poOpenInfo->pabyHeader, 15) == 0;
    }
    else
    {
        VSILFILE* fp = VSIFOpenL( pszFilename, "rb" );
        if( fp == nullptr )
        {
            return FALSE;
        }

        char buffer[48];
        int ret = (VSIFReadL(buffer, 1, 48, fp) == 48) &&
                   memcmp(pattern, buffer, 15) == 0;
        CPL_IGNORE_RET_VAL(VSIFCloseL(fp));
        return ret;
    }
}

/************************************************************************/
/*                             IsNITFFileTOC()                          */
/************************************************************************/

/* Check whether this NITF file is a TOC file */
int RPFTOCDataset::IsNITFFileTOC(NITFFile *psFile)
{
    const char* fileTitle = CSLFetchNameValue(psFile->papszMetadata, "NITF_FTITLE");
    while(fileTitle && *fileTitle)
    {
        if (EQUAL(fileTitle, "A.TOC"))
        {
            return TRUE;
        }
        fileTitle++;
    }
    return FALSE;
}

/************************************************************************/
/*                                OpenFileTOC()                         */
/************************************************************************/

/* Create a dataset from a TOC file */
/* If psFile == NULL, the TOC file has no NITF header */
/* If entryName != NULL, the dataset will be made just of the entry of the TOC file */
GDALDataset* RPFTOCDataset::OpenFileTOC(NITFFile *psFile,
                                        const char* pszFilename,
                                        const char* entryName,
                                        const char* openInformationName)
{
    char buffer[48];
    VSILFILE* fp = nullptr;
    if (psFile == nullptr)
    {
        fp = VSIFOpenL( pszFilename, "rb" );

        if( fp == nullptr )
        {
            CPLError( CE_Failure, CPLE_OpenFailed,
                    "Failed to open file %s.",
                    pszFilename );
            return nullptr;
        }
        if( VSIFReadL(buffer, 1, 48, fp) != 48 )
        {
            CPLError( CE_Failure, CPLE_FileIO, "I/O error" );
            CPL_IGNORE_RET_VAL(VSIFCloseL(fp));
            return nullptr;
        }
    }
    const int isRGBA = CPLTestBool(CPLGetConfigOption("RPFTOC_FORCE_RGBA", "NO"));
    RPFToc* toc = (psFile) ? RPFTOCRead( pszFilename, psFile ) :
                              RPFTOCReadFromBuffer( pszFilename, fp, buffer);
    if (fp)
        CPL_IGNORE_RET_VAL(VSIFCloseL(fp));
    fp = nullptr;

    if (entryName != nullptr)
    {
        if (toc)
        {
            for( int i = 0; i < toc->nEntries; i++)
            {
                if (EQUAL(entryName, MakeTOCEntryName(&toc->entries[i])))
                {
                    GDALDataset* ds = RPFTOCSubDataset::CreateDataSetFromTocEntry(openInformationName, pszFilename, i,
                                                                                  &toc->entries[i], isRGBA,
                                                                                  (psFile) ? psFile->papszMetadata : nullptr);

                    RPFTOCFree(toc);
                    return ds;
                }
            }
            CPLError( CE_Failure, CPLE_AppDefined,
                        "The entry %s does not exist in file %s.", entryName, pszFilename );
        }
        RPFTOCFree(toc);
        return nullptr;
    }

    if (toc)
    {
        RPFTOCDataset* ds = new RPFTOCDataset();
        if (psFile)
            ds->SetMetadata( psFile->papszMetadata );

        bool ok = false;
        char* projectionRef = nullptr;
        double nwLong = 0.0;
        double nwLat = 0.0;
        double seLong = 0.0;
        double seLat = 0.0;
        double adfGeoTransform[6] = {};

        ds->papszFileList = CSLAddString(ds->papszFileList, pszFilename);

        for( int i = 0; i < toc->nEntries; i++ )
        {
            if (!toc->entries[i].isOverviewOrLegend)
            {
                GDALDataset* tmpDS = RPFTOCSubDataset::CreateDataSetFromTocEntry(openInformationName, pszFilename, i,
                                                                                 &toc->entries[i], isRGBA, nullptr);
                if (tmpDS)
                {
                    char** papszSubDatasetFileList = tmpDS->GetFileList();
                    /* Yes, begin at 1, since the first is the a.toc */
                    ds->papszFileList = CSLInsertStrings(ds->papszFileList, -1, papszSubDatasetFileList + 1);
                    CSLDestroy(papszSubDatasetFileList);

                    tmpDS->GetGeoTransform(adfGeoTransform);
                    if (projectionRef == nullptr)
                    {
                        ok = true;
                        projectionRef = CPLStrdup(tmpDS->GetProjectionRef());
                        nwLong = adfGeoTransform[GEOTRSFRM_TOPLEFT_X];
                        nwLat = adfGeoTransform[GEOTRSFRM_TOPLEFT_Y];
                        seLong = nwLong + adfGeoTransform[GEOTRSFRM_WE_RES] * tmpDS->GetRasterXSize();
                        seLat = nwLat + adfGeoTransform[GEOTRSFRM_NS_RES] * tmpDS->GetRasterYSize();
                    }
                    else if (ok)
                    {
                        double _nwLong = adfGeoTransform[GEOTRSFRM_TOPLEFT_X];
                        double _nwLat = adfGeoTransform[GEOTRSFRM_TOPLEFT_Y];
                        double _seLong = _nwLong + adfGeoTransform[GEOTRSFRM_WE_RES] * tmpDS->GetRasterXSize();
                        double _seLat = _nwLat + adfGeoTransform[GEOTRSFRM_NS_RES] * tmpDS->GetRasterYSize();
                        if (! EQUAL(projectionRef, tmpDS->GetProjectionRef()) )
                            ok = false;
                        if (_nwLong < nwLong)
                            nwLong = _nwLong;
                        if (_nwLat > nwLat)
                            nwLat = _nwLat;
                        if (_seLong > seLong)
                            seLong = _seLong;
                        if (_seLat < seLat)
                            seLat = _seLat;
                    }
                    delete tmpDS;
                    ds->AddSubDataset(pszFilename, &toc->entries[i]);
                }
            }
        }
        if (ok)
        {
            adfGeoTransform[GEOTRSFRM_TOPLEFT_X] = nwLong;
            adfGeoTransform[GEOTRSFRM_TOPLEFT_Y] = nwLat;
            ds->SetSize(
                static_cast<int>( 0.5 + (seLong - nwLong)
                                  / adfGeoTransform[GEOTRSFRM_WE_RES] ),
                static_cast<int>( 0.5 + (seLat - nwLat)
                                  / adfGeoTransform[GEOTRSFRM_NS_RES]) );

            ds->SetGeoTransform(adfGeoTransform);
            ds->SetProjection(projectionRef);
        }
        CPLFree(projectionRef);
        RPFTOCFree(toc);

/* -------------------------------------------------------------------- */
/*      Initialize any PAM information.                                 */
/* -------------------------------------------------------------------- */
        ds->SetDescription( pszFilename );
        ds->TryLoadXML();

        return ds;
    }

    return nullptr;
}

/************************************************************************/
/*                              Identify()                              */
/************************************************************************/

int RPFTOCDataset::Identify( GDALOpenInfo * poOpenInfo )

{
    const char *pszFilename = poOpenInfo->pszFilename;

/* -------------------------------------------------------------------- */
/*      Is this a sub-dataset selector? If so, it is obviously RPFTOC.  */
/* -------------------------------------------------------------------- */

    if( STARTS_WITH_CI(pszFilename, "NITF_TOC_ENTRY:"))
        return TRUE;

/* -------------------------------------------------------------------- */
/*      First we check to see if the file has the expected header       */
/*      bytes.                                                          */
/* -------------------------------------------------------------------- */
    if( poOpenInfo->nHeaderBytes < 48 )
        return FALSE;

    if ( IsNonNITFFileTOC( poOpenInfo, pszFilename) )
        return TRUE;

    if( !STARTS_WITH_CI((char *) poOpenInfo->pabyHeader, "NITF")
        && !STARTS_WITH_CI((char *) poOpenInfo->pabyHeader, "NSIF")
        && !STARTS_WITH_CI((char *) poOpenInfo->pabyHeader, "NITF") )
        return FALSE;

    /* If it is a NITF A.TOC file, it must contain A.TOC in its header */
    for( int i = 0;
         i < static_cast<int>( poOpenInfo->nHeaderBytes )
             - static_cast<int>( strlen( "A.TOC" ) );
         i++ )
    {
        if (STARTS_WITH_CI((const char*)poOpenInfo->pabyHeader + i, "A.TOC"))
            return TRUE;
    }

    return FALSE;
}

/************************************************************************/
/*                                Open()                                */
/************************************************************************/

GDALDataset *RPFTOCDataset::Open( GDALOpenInfo * poOpenInfo )

{
    if( !Identify( poOpenInfo ) )
        return nullptr;

    const char *pszFilename = poOpenInfo->pszFilename;
    char* entryName = nullptr;

    if( STARTS_WITH_CI(pszFilename, "NITF_TOC_ENTRY:"))
    {
        pszFilename += strlen("NITF_TOC_ENTRY:");
        entryName = CPLStrdup(pszFilename);
        char* c = entryName;
        while( *c != '\0' && *c != ':' )
            c++;
        if( *c != ':' )
        {
            CPLFree(entryName);
            return nullptr;
        }
        *c = 0;

        while( *pszFilename != '\0' && *pszFilename != ':' )
            pszFilename++;
        pszFilename++;
    }

    if (IsNonNITFFileTOC((entryName != nullptr) ? nullptr : poOpenInfo, pszFilename))
    {
        GDALDataset* poDS = OpenFileTOC(nullptr, pszFilename, entryName, poOpenInfo->pszFilename);

        CPLFree(entryName);

        if (poDS && poOpenInfo->eAccess == GA_Update)
        {
            CPLError(CE_Failure, CPLE_NotSupported, "RPFTOC driver does not support update mode");
            delete poDS;
            return nullptr;
        }

        return poDS;
    }

/* -------------------------------------------------------------------- */
/*      Open the file with library.                                     */
/* -------------------------------------------------------------------- */
    NITFFile *psFile = NITFOpen( pszFilename, FALSE );
    if( psFile == nullptr )
    {
        CPLFree(entryName);
        return nullptr;
    }

/* -------------------------------------------------------------------- */
/*      Check if it is a TOC file .                                     */
/* -------------------------------------------------------------------- */
    if (IsNITFFileTOC(psFile))
    {
        GDALDataset* poDS = OpenFileTOC(psFile, pszFilename, entryName, poOpenInfo->pszFilename);
        NITFClose( psFile );
        CPLFree(entryName);

        if (poDS && poOpenInfo->eAccess == GA_Update)
        {
            CPLError(CE_Failure, CPLE_NotSupported, "RPFTOC driver does not support update mode");
            delete poDS;
            return nullptr;
        }

        return poDS;
    }
    else
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                          "File %s is not a TOC file.", pszFilename );
        NITFClose( psFile );
        CPLFree(entryName);
        return nullptr;
    }
}

/************************************************************************/
/*                          GDALRegister_RPFTOC()                       */
/************************************************************************/

void GDALRegister_RPFTOC()

{
    if( GDALGetDriverByName( "RPFTOC" ) != nullptr )
        return;

    GDALDriver *poDriver = new GDALDriver();

    poDriver->SetDescription( "RPFTOC" );
    poDriver->SetMetadataItem( GDAL_DCAP_RASTER, "YES" );
    poDriver->SetMetadataItem( GDAL_DMD_LONGNAME,
                               "Raster Product Format TOC format" );

    poDriver->pfnIdentify = RPFTOCDataset::Identify;
    poDriver->pfnOpen = RPFTOCDataset::Open;

    poDriver->SetMetadataItem( GDAL_DMD_HELPTOPIC,
                               "frmt_various.html#RPFTOC" );
    poDriver->SetMetadataItem( GDAL_DMD_EXTENSION, "toc" );
    poDriver->SetMetadataItem( GDAL_DCAP_VIRTUALIO, "YES" );
    poDriver->SetMetadataItem( GDAL_DMD_SUBDATASETS, "YES" );

    GetGDALDriverManager()->RegisterDriver( poDriver );
}