/******************************************************************************
 *
 * Project:  ISIS Version 2 Driver
 * Purpose:  Implementation of ISIS2Dataset
 * Author:   Trent Hare (thare@usgs.gov),
 *           Robert Soricone (rsoricone@usgs.gov)
 *           Ludovic Mercier (ludovic.mercier@gmail.com)
 *           Frank Warmerdam (warmerdam@pobox.com)
 *
 * NOTE: Original code authored by Trent and Robert and placed in the public
 * domain as per US government policy.  I have (within my rights) appropriated
 * it and placed it under the following license.  This is not intended to
 * diminish Trent and Roberts contribution.
 ******************************************************************************
 * Copyright (c) 2006, Frank Warmerdam <warmerdam@pobox.com>
 * Copyright (c) 2008-2011, Even Rouault <even dot rouault at spatialys.com>
 *
 * 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.
 ****************************************************************************/

constexpr int NULL1 = 0;
constexpr int NULL2 = -32768;
constexpr double NULL3 = -3.4028226550889044521e+38;

constexpr int RECORD_SIZE = 512;

#include "cpl_string.h"
#include "gdal_frmts.h"
#include "nasakeywordhandler.h"
#include "ogr_spatialref.h"
#include "rawdataset.h"

/************************************************************************/
/* ==================================================================== */
/*                      ISISDataset     version2                        */
/* ==================================================================== */
/************************************************************************/

class ISIS2Dataset final : public RawDataset
{
    VSILFILE *fpImage;  // image data file.
    CPLString osExternalCube;

    NASAKeywordHandler oKeywords;

    int bGotTransform;
    double adfGeoTransform[6];

    OGRSpatialReference m_oSRS{};

    int parse_label(const char *file, char *keyword, char *value);
    int strstrip(char instr[], char outstr[], int position);

    CPLString oTempResult;

    static void CleanString(CPLString &osInput);

    const char *GetKeyword(const char *pszPath, const char *pszDefault = "");
    const char *GetKeywordSub(const char *pszPath, int iSubscript,
                              const char *pszDefault = "");

    CPLErr Close() override;

  public:
    ISIS2Dataset();
    virtual ~ISIS2Dataset();

    virtual CPLErr GetGeoTransform(double *padfTransform) override;
    const OGRSpatialReference *GetSpatialRef() const override;

    virtual char **GetFileList() override;

    static int Identify(GDALOpenInfo *);
    static GDALDataset *Open(GDALOpenInfo *);
    static GDALDataset *Create(const char *pszFilename, int nXSize, int nYSize,
                               int nBandsIn, GDALDataType eType,
                               char **papszParamList);

    // Write related.
    static int WriteRaster(CPLString osFilename, bool includeLabel,
                           GUIntBig iRecord, GUIntBig iLabelRecords,
                           GDALDataType eType, const char *pszInterleaving);

    static int WriteLabel(CPLString osFilename, CPLString osRasterFile,
                          CPLString sObjectTag, unsigned int nXSize,
                          unsigned int nYSize, unsigned int nBandsIn,
                          GDALDataType eType, GUIntBig iRecords,
                          const char *pszInterleaving, GUIntBig &iLabelRecords,
                          bool bRelaunch = false);
    static int WriteQUBE_Information(VSILFILE *fpLabel, unsigned int iLevel,
                                     unsigned int &nWritingBytes,
                                     unsigned int nXSize, unsigned int nYSize,
                                     unsigned int nBandsIn, GDALDataType eType,
                                     const char *pszInterleaving);

    static unsigned int WriteKeyword(VSILFILE *fpLabel, unsigned int iLevel,
                                     CPLString key, CPLString value);
    static unsigned int WriteFormatting(VSILFILE *fpLabel, CPLString data);
    static GUIntBig RecordSizeCalculation(unsigned int nXSize,
                                          unsigned int nYSize,
                                          unsigned int nBands,
                                          GDALDataType eType);
};

/************************************************************************/
/*                            ISIS2Dataset()                            */
/************************************************************************/

ISIS2Dataset::ISIS2Dataset() : fpImage(nullptr), bGotTransform(FALSE)
{
    m_oSRS.SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
    adfGeoTransform[0] = 0.0;
    adfGeoTransform[1] = 1.0;
    adfGeoTransform[2] = 0.0;
    adfGeoTransform[3] = 0.0;
    adfGeoTransform[4] = 0.0;
    adfGeoTransform[5] = 1.0;
}

/************************************************************************/
/*                            ~ISIS2Dataset()                            */
/************************************************************************/

ISIS2Dataset::~ISIS2Dataset()

{
    ISIS2Dataset::Close();
}

/************************************************************************/
/*                              Close()                                 */
/************************************************************************/

CPLErr ISIS2Dataset::Close()
{
    CPLErr eErr = CE_None;
    if (nOpenFlags != OPEN_FLAGS_CLOSED)
    {
        if (ISIS2Dataset::FlushCache(true) != CE_None)
            eErr = CE_Failure;
        if (fpImage != nullptr)
        {
            if (VSIFCloseL(fpImage) != 0)
                eErr = CE_Failure;
        }
        if (GDALPamDataset::Close() != CE_None)
            eErr = CE_Failure;
    }
    return eErr;
}

/************************************************************************/
/*                            GetFileList()                             */
/************************************************************************/

char **ISIS2Dataset::GetFileList()

{
    char **papszFileList = GDALPamDataset::GetFileList();

    if (!osExternalCube.empty())
        papszFileList = CSLAddString(papszFileList, osExternalCube);

    return papszFileList;
}

/************************************************************************/
/*                         GetSpatialRef()                              */
/************************************************************************/

const OGRSpatialReference *ISIS2Dataset::GetSpatialRef() const
{
    if (!m_oSRS.IsEmpty())
        return &m_oSRS;
    return GDALPamDataset::GetSpatialRef();
}

/************************************************************************/
/*                          GetGeoTransform()                           */
/************************************************************************/

CPLErr ISIS2Dataset::GetGeoTransform(double *padfTransform)

{
    if (bGotTransform)
    {
        memcpy(padfTransform, adfGeoTransform, sizeof(double) * 6);
        return CE_None;
    }

    return GDALPamDataset::GetGeoTransform(padfTransform);
}

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

int ISIS2Dataset::Identify(GDALOpenInfo *poOpenInfo)
{
    if (poOpenInfo->pabyHeader == nullptr)
        return FALSE;

    if (strstr((const char *)poOpenInfo->pabyHeader, "^QUBE") == nullptr)
        return FALSE;

    return TRUE;
}

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

GDALDataset *ISIS2Dataset::Open(GDALOpenInfo *poOpenInfo)
{
    /* -------------------------------------------------------------------- */
    /*      Does this look like a CUBE or an IMAGE Primary Data Object?     */
    /* -------------------------------------------------------------------- */
    if (!Identify(poOpenInfo) || poOpenInfo->fpL == nullptr)
        return nullptr;

    VSILFILE *fpQube = poOpenInfo->fpL;
    poOpenInfo->fpL = nullptr;

    auto poDS = cpl::make_unique<ISIS2Dataset>();

    if (!poDS->oKeywords.Ingest(fpQube, 0))
    {
        VSIFCloseL(fpQube);
        return nullptr;
    }

    VSIFCloseL(fpQube);

    /* -------------------------------------------------------------------- */
    /*      We assume the user is pointing to the label (i.e. .lab) file.   */
    /* -------------------------------------------------------------------- */
    // QUBE can be inline or detached and point to an image name
    // ^QUBE = 76
    // ^QUBE = ("ui31s015.img",6441<BYTES>) - has another label on the image
    // ^QUBE = "ui31s015.img" - which implies no label or skip value

    const char *pszQube = poDS->GetKeyword("^QUBE");
    int nQube = 0;
    int bByteLocation = FALSE;
    CPLString osTargetFile = poOpenInfo->pszFilename;

    if (pszQube[0] == '"')
    {
        const CPLString osTPath = CPLGetPath(poOpenInfo->pszFilename);
        CPLString osFilename = pszQube;
        poDS->CleanString(osFilename);
        osTargetFile = CPLFormCIFilename(osTPath, osFilename, nullptr);
        poDS->osExternalCube = osTargetFile;
    }
    else if (pszQube[0] == '(')
    {
        const CPLString osTPath = CPLGetPath(poOpenInfo->pszFilename);
        CPLString osFilename = poDS->GetKeywordSub("^QUBE", 1, "");
        poDS->CleanString(osFilename);
        osTargetFile = CPLFormCIFilename(osTPath, osFilename, nullptr);
        poDS->osExternalCube = osTargetFile;

        nQube = atoi(poDS->GetKeywordSub("^QUBE", 2, "1"));
        if (strstr(poDS->GetKeywordSub("^QUBE", 2, "1"), "<BYTES>") != nullptr)
            bByteLocation = true;
    }
    else
    {
        nQube = atoi(pszQube);
        if (strstr(pszQube, "<BYTES>") != nullptr)
            bByteLocation = true;
    }

    /* -------------------------------------------------------------------- */
    /*      Check if file an ISIS2 header file?  Read a few lines of text   */
    /*      searching for something starting with nrows or ncols.           */
    /* -------------------------------------------------------------------- */

    /* -------------------------------------------------------------------- */
    /*      Checks to see if this is valid ISIS2 cube                       */
    /*      SUFFIX_ITEM tag in .cub file should be (0,0,0); no side-planes  */
    /* -------------------------------------------------------------------- */
    const int s_ix = atoi(poDS->GetKeywordSub("QUBE.SUFFIX_ITEMS", 1));
    const int s_iy = atoi(poDS->GetKeywordSub("QUBE.SUFFIX_ITEMS", 2));
    const int s_iz = atoi(poDS->GetKeywordSub("QUBE.SUFFIX_ITEMS", 3));

    if (s_ix != 0 || s_iy != 0 || s_iz != 0)
    {
        CPLError(CE_Failure, CPLE_OpenFailed,
                 "*** ISIS 2 cube file has invalid SUFFIX_ITEMS parameters:\n"
                 "*** gdal isis2 driver requires (0, 0, 0), thus no sideplanes "
                 "or backplanes\n"
                 "found: (%i, %i, %i)\n\n",
                 s_ix, s_iy, s_iz);
        return nullptr;
    }

    /**************** end SUFFIX_ITEM check ***********************/

    /***********   Grab layout type (BSQ, BIP, BIL) ************/
    //  AXIS_NAME = (SAMPLE,LINE,BAND)
    /***********************************************************/

    char szLayout[10] = "BSQ";  // default to band seq.
    const char *value = poDS->GetKeyword("QUBE.AXIS_NAME", "");
    if (EQUAL(value, "(SAMPLE,LINE,BAND)"))
        strcpy(szLayout, "BSQ");
    else if (EQUAL(value, "(BAND,LINE,SAMPLE)"))
        strcpy(szLayout, "BIP");
    else if (EQUAL(value, "(SAMPLE,BAND,LINE)") || EQUAL(value, ""))
        strcpy(szLayout, "BSQ");
    else
    {
        CPLError(CE_Failure, CPLE_OpenFailed,
                 "%s layout not supported. Abort\n\n", value);
        return nullptr;
    }

    /***********   Grab samples lines band ************/
    const int nCols = atoi(poDS->GetKeywordSub("QUBE.CORE_ITEMS", 1));
    const int nRows = atoi(poDS->GetKeywordSub("QUBE.CORE_ITEMS", 2));
    const int nBands = atoi(poDS->GetKeywordSub("QUBE.CORE_ITEMS", 3));

    /***********   Grab Qube record bytes  **********/
    const int record_bytes = atoi(poDS->GetKeyword("RECORD_BYTES"));
    if (record_bytes < 0)
    {
        return nullptr;
    }

    GUIntBig nSkipBytes = 0;
    if (nQube > 0 && bByteLocation)
        nSkipBytes = (nQube - 1);
    else if (nQube > 0)
        nSkipBytes = static_cast<GUIntBig>(nQube - 1) * record_bytes;
    else
        nSkipBytes = 0;

    /***********   Grab samples lines band ************/
    char chByteOrder = 'M';  // default to MSB
    CPLString osCoreItemType = poDS->GetKeyword("QUBE.CORE_ITEM_TYPE");
    if ((EQUAL(osCoreItemType, "PC_INTEGER")) ||
        (EQUAL(osCoreItemType, "PC_UNSIGNED_INTEGER")) ||
        (EQUAL(osCoreItemType, "PC_REAL")))
    {
        chByteOrder = 'I';
    }

    /********   Grab format type - isis2 only supports 8,16,32 *******/
    GDALDataType eDataType = GDT_Byte;
    bool bNoDataSet = false;
    double dfNoData = 0.0;

    int itype = atoi(poDS->GetKeyword("QUBE.CORE_ITEM_BYTES", ""));
    switch (itype)
    {
        case 1:
            eDataType = GDT_Byte;
            dfNoData = NULL1;
            bNoDataSet = true;
            break;
        case 2:
            if (strstr(osCoreItemType, "UNSIGNED") != nullptr)
            {
                dfNoData = 0;
                eDataType = GDT_UInt16;
            }
            else
            {
                dfNoData = NULL2;
                eDataType = GDT_Int16;
            }
            bNoDataSet = true;
            break;
        case 4:
            eDataType = GDT_Float32;
            dfNoData = NULL3;
            bNoDataSet = true;
            break;
        case 8:
            eDataType = GDT_Float64;
            dfNoData = NULL3;
            bNoDataSet = true;
            break;
        default:
            CPLError(CE_Failure, CPLE_AppDefined,
                     "Itype of %d is not supported in ISIS 2.", itype);
            return nullptr;
    }

    /***********   Grab Cellsize ************/
    double dfXDim = 1.0;
    double dfYDim = 1.0;

    value = poDS->GetKeyword("QUBE.IMAGE_MAP_PROJECTION.MAP_SCALE");
    if (strlen(value) > 0)
    {
        // Convert km to m
        dfXDim = static_cast<float>(CPLAtof(value) * 1000.0);
        dfYDim = static_cast<float>(CPLAtof(value) * 1000.0 * -1);
    }

    /***********   Grab LINE_PROJECTION_OFFSET ************/
    double dfULYMap = 0.5;

    value =
        poDS->GetKeyword("QUBE.IMAGE_MAP_PROJECTION.LINE_PROJECTION_OFFSET");
    if (strlen(value) > 0)
    {
        const double yulcenter = static_cast<float>(CPLAtof(value)) * dfYDim;
        dfULYMap = yulcenter - (dfYDim / 2);
    }

    /***********   Grab SAMPLE_PROJECTION_OFFSET ************/
    double dfULXMap = 0.5;

    value =
        poDS->GetKeyword("QUBE.IMAGE_MAP_PROJECTION.SAMPLE_PROJECTION_OFFSET");
    if (strlen(value) > 0)
    {
        const double xulcenter = static_cast<float>(CPLAtof(value)) * dfXDim;
        dfULXMap = xulcenter - (dfXDim / 2);
    }

    /***********  Grab TARGET_NAME  ************/
    /**** This is the planets name i.e. MARS ***/
    CPLString target_name = poDS->GetKeyword("QUBE.TARGET_NAME");

    /***********   Grab MAP_PROJECTION_TYPE ************/
    CPLString map_proj_name =
        poDS->GetKeyword("QUBE.IMAGE_MAP_PROJECTION.MAP_PROJECTION_TYPE");
    poDS->CleanString(map_proj_name);

    /***********   Grab SEMI-MAJOR ************/
    const double semi_major =
        CPLAtof(poDS->GetKeyword("QUBE.IMAGE_MAP_PROJECTION.A_AXIS_RADIUS")) *
        1000.0;

    /***********   Grab semi-minor ************/
    const double semi_minor =
        CPLAtof(poDS->GetKeyword("QUBE.IMAGE_MAP_PROJECTION.C_AXIS_RADIUS")) *
        1000.0;

    /***********   Grab CENTER_LAT ************/
    const double center_lat =
        CPLAtof(poDS->GetKeyword("QUBE.IMAGE_MAP_PROJECTION.CENTER_LATITUDE"));

    /***********   Grab CENTER_LON ************/
    const double center_lon =
        CPLAtof(poDS->GetKeyword("QUBE.IMAGE_MAP_PROJECTION.CENTER_LONGITUDE"));

    /***********   Grab 1st std parallel ************/
    const double first_std_parallel = CPLAtof(
        poDS->GetKeyword("QUBE.IMAGE_MAP_PROJECTION.FIRST_STANDARD_PARALLEL"));

    /***********   Grab 2nd std parallel ************/
    const double second_std_parallel = CPLAtof(
        poDS->GetKeyword("QUBE.IMAGE_MAP_PROJECTION.SECOND_STANDARD_PARALLEL"));

    /*** grab  PROJECTION_LATITUDE_TYPE = "PLANETOCENTRIC" ****/
    // Need to further study how ocentric/ographic will effect the gdal library.
    // So far we will use this fact to define a sphere or ellipse for some
    // projections Frank - may need to talk this over
    bool bIsGeographic = true;
    value =
        poDS->GetKeyword("CUBE.IMAGE_MAP_PROJECTION.PROJECTION_LATITUDE_TYPE");
    if (EQUAL(value, "\"PLANETOCENTRIC\""))
        bIsGeographic = false;

    CPLDebug("ISIS2", "using projection %s", map_proj_name.c_str());

    OGRSpatialReference oSRS;
    oSRS.SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
    bool bProjectionSet = true;

    // Set oSRS projection and parameters
    if ((EQUAL(map_proj_name, "EQUIRECTANGULAR_CYLINDRICAL")) ||
        (EQUAL(map_proj_name, "EQUIRECTANGULAR")) ||
        (EQUAL(map_proj_name, "SIMPLE_CYLINDRICAL")))
    {
        oSRS.OGRSpatialReference::SetEquirectangular2(0.0, center_lon,
                                                      center_lat, 0, 0);
    }
    else if (EQUAL(map_proj_name, "ORTHOGRAPHIC"))
    {
        oSRS.OGRSpatialReference::SetOrthographic(center_lat, center_lon, 0, 0);
    }
    else if ((EQUAL(map_proj_name, "SINUSOIDAL")) ||
             (EQUAL(map_proj_name, "SINUSOIDAL_EQUAL-AREA")))
    {
        oSRS.OGRSpatialReference::SetSinusoidal(center_lon, 0, 0);
    }
    else if (EQUAL(map_proj_name, "MERCATOR"))
    {
        oSRS.OGRSpatialReference::SetMercator(center_lat, center_lon, 1, 0, 0);
    }
    else if (EQUAL(map_proj_name, "POLAR_STEREOGRAPHIC"))
    {
        oSRS.OGRSpatialReference::SetPS(center_lat, center_lon, 1, 0, 0);
    }
    else if (EQUAL(map_proj_name, "TRANSVERSE_MERCATOR"))
    {
        oSRS.OGRSpatialReference::SetTM(center_lat, center_lon, 1, 0, 0);
    }
    else if (EQUAL(map_proj_name, "LAMBERT_CONFORMAL_CONIC"))
    {
        oSRS.OGRSpatialReference::SetLCC(first_std_parallel,
                                         second_std_parallel, center_lat,
                                         center_lon, 0, 0);
    }
    else if (EQUAL(map_proj_name, ""))
    {
        /* no projection */
        bProjectionSet = false;
    }
    else
    {
        CPLDebug("ISIS2",
                 "Dataset projection %s is not supported. Continuing...",
                 map_proj_name.c_str());
        bProjectionSet = false;
    }

    if (bProjectionSet)
    {
        // Create projection name, i.e. MERCATOR MARS and set as ProjCS keyword
        const CPLString proj_target_name = map_proj_name + " " + target_name;
        oSRS.SetProjCS(proj_target_name);  // set ProjCS keyword

        // The geographic/geocentric name will be the same basic name as the
        // body name 'GCS' = Geographic/Geocentric Coordinate System
        const CPLString geog_name = "GCS_" + target_name;

        // The datum and sphere names will be the same basic name aas the planet
        const CPLString datum_name = "D_" + target_name;
        // Might not be IAU defined so don't add.
        CPLString sphere_name = target_name;  // + "_IAU_IAG");

        // calculate inverse flattening from major and minor axis: 1/f = a/(a-b)
        double iflattening = 0.0;
        if ((semi_major - semi_minor) < 0.0000001)
            iflattening = 0;
        else
            iflattening = semi_major / (semi_major - semi_minor);

        // Set the body size but take into consideration which proj is being
        // used to help w/ proj4 compatibility The use of a Sphere, polar radius
        // or ellipse here is based on how ISIS does it internally
        if (((EQUAL(map_proj_name, "STEREOGRAPHIC") &&
              (fabs(center_lat) == 90))) ||
            (EQUAL(map_proj_name, "POLAR_STEREOGRAPHIC")))
        {
            if (bIsGeographic)
            {
                // Geograpraphic, so set an ellipse
                oSRS.SetGeogCS(geog_name, datum_name, sphere_name, semi_major,
                               iflattening, "Reference_Meridian", 0.0);
            }
            else
            {
                // Geocentric, so force a sphere using the semi-minor axis. I
                // hope...
                sphere_name += "_polarRadius";
                oSRS.SetGeogCS(geog_name, datum_name, sphere_name, semi_minor,
                               0.0, "Reference_Meridian", 0.0);
            }
        }
        else if ((EQUAL(map_proj_name, "SIMPLE_CYLINDRICAL")) ||
                 (EQUAL(map_proj_name, "ORTHOGRAPHIC")) ||
                 (EQUAL(map_proj_name, "STEREOGRAPHIC")) ||
                 (EQUAL(map_proj_name, "SINUSOIDAL_EQUAL-AREA")) ||
                 (EQUAL(map_proj_name, "SINUSOIDAL")))
        {
            // ISIS uses the spherical equation for these projections so force
            // a sphere.
            oSRS.SetGeogCS(geog_name, datum_name, sphere_name, semi_major, 0.0,
                           "Reference_Meridian", 0.0);
        }
        else if ((EQUAL(map_proj_name, "EQUIRECTANGULAR_CYLINDRICAL")) ||
                 (EQUAL(map_proj_name, "EQUIRECTANGULAR")))
        {
            // Calculate localRadius using ISIS3 simple elliptical method
            //   not the more standard Radius of Curvature method
            // PI = 4 * atan(1);
            if (center_lon == 0)
            {  // No need to calculate local radius
                oSRS.SetGeogCS(geog_name, datum_name, sphere_name, semi_major,
                               0.0, "Reference_Meridian", 0.0);
            }
            else
            {
                const double radLat = center_lat * M_PI / 180;  // in radians
                const double localRadius =
                    semi_major * semi_minor /
                    sqrt(pow(semi_minor * cos(radLat), 2) +
                         pow(semi_major * sin(radLat), 2));
                sphere_name += "_localRadius";
                oSRS.SetGeogCS(geog_name, datum_name, sphere_name, localRadius,
                               0.0, "Reference_Meridian", 0.0);
                CPLDebug("ISIS2", "local radius: %f", localRadius);
            }
        }
        else
        {
            // All other projections: Mercator, Transverse Mercator, Lambert
            // Conformal, etc. Geographic, so set an ellipse
            if (bIsGeographic)
            {
                oSRS.SetGeogCS(geog_name, datum_name, sphere_name, semi_major,
                               iflattening, "Reference_Meridian", 0.0);
            }
            else
            {
                // Geocentric, so force a sphere. I hope...
                oSRS.SetGeogCS(geog_name, datum_name, sphere_name, semi_major,
                               0.0, "Reference_Meridian", 0.0);
            }
        }

        // translate back into a projection string.
        poDS->m_oSRS = oSRS;
    }

    /* END ISIS2 Label Read */
    /*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

    /* -------------------------------------------------------------------- */
    /*      Did we get the required keywords?  If not we return with        */
    /*      this never having been considered to be a match. This isn't     */
    /*      an error!                                                       */
    /* -------------------------------------------------------------------- */
    if (!GDALCheckDatasetDimensions(nCols, nRows) ||
        !GDALCheckBandCount(nBands, false))
    {
        return nullptr;
    }

    /* -------------------------------------------------------------------- */
    /*      Capture some information from the file that is of interest.     */
    /* -------------------------------------------------------------------- */
    poDS->nRasterXSize = nCols;
    poDS->nRasterYSize = nRows;

    /* -------------------------------------------------------------------- */
    /*      Open target binary file.                                        */
    /* -------------------------------------------------------------------- */

    if (poOpenInfo->eAccess == GA_ReadOnly)
        poDS->fpImage = VSIFOpenL(osTargetFile, "rb");
    else
        poDS->fpImage = VSIFOpenL(osTargetFile, "r+b");

    if (poDS->fpImage == nullptr)
    {
        CPLError(CE_Failure, CPLE_OpenFailed,
                 "Failed to open %s with write permission.\n%s",
                 osTargetFile.c_str(), VSIStrerror(errno));
        return nullptr;
    }

    poDS->eAccess = poOpenInfo->eAccess;

    /* -------------------------------------------------------------------- */
    /*      Compute the line offset.                                        */
    /* -------------------------------------------------------------------- */
    int nItemSize = GDALGetDataTypeSizeBytes(eDataType);
    int nLineOffset, nPixelOffset;
    vsi_l_offset nBandOffset;

    if (EQUAL(szLayout, "BIP"))
    {
        nPixelOffset = nItemSize * nBands;
        if (nPixelOffset > INT_MAX / nBands)
        {
            return nullptr;
        }
        nLineOffset = nPixelOffset * nCols;
        nBandOffset = nItemSize;
    }
    else if (EQUAL(szLayout, "BSQ"))
    {
        nPixelOffset = nItemSize;
        if (nPixelOffset > INT_MAX / nCols)
        {
            return nullptr;
        }
        nLineOffset = nPixelOffset * nCols;
        nBandOffset = static_cast<vsi_l_offset>(nLineOffset) * nRows;
    }
    else /* assume BIL */
    {
        nPixelOffset = nItemSize;
        if (nPixelOffset > INT_MAX / nBands ||
            nPixelOffset * nBands > INT_MAX / nCols)
        {
            return nullptr;
        }
        nLineOffset = nItemSize * nBands * nCols;
        nBandOffset = static_cast<vsi_l_offset>(nItemSize) * nCols;
    }

    /* -------------------------------------------------------------------- */
    /*      Create band information objects.                                */
    /* -------------------------------------------------------------------- */
    for (int i = 0; i < nBands; i++)
    {
        auto poBand = RawRasterBand::Create(
            poDS.get(), i + 1, poDS->fpImage, nSkipBytes + nBandOffset * i,
            nPixelOffset, nLineOffset, eDataType,
            chByteOrder == 'I' || chByteOrder == 'L'
                ? RawRasterBand::ByteOrder::ORDER_LITTLE_ENDIAN
                : RawRasterBand::ByteOrder::ORDER_BIG_ENDIAN,
            RawRasterBand::OwnFP::NO);
        if (!poBand)
            return nullptr;

        if (bNoDataSet)
            poBand->SetNoDataValue(dfNoData);

        // Set offset/scale values at the PAM level.
        poBand->SetOffset(CPLAtofM(poDS->GetKeyword("QUBE.CORE_BASE", "0.0")));
        poBand->SetScale(
            CPLAtofM(poDS->GetKeyword("QUBE.CORE_MULTIPLIER", "1.0")));

        poDS->SetBand(i + 1, std::move(poBand));
    }

    /* -------------------------------------------------------------------- */
    /*      Check for a .prj file. For isis2 I would like to keep this in   */
    /* -------------------------------------------------------------------- */
    const CPLString osPath = CPLGetPath(poOpenInfo->pszFilename);
    const CPLString osName = CPLGetBasename(poOpenInfo->pszFilename);
    const char *pszPrjFile = CPLFormCIFilename(osPath, osName, "prj");

    VSILFILE *fp = VSIFOpenL(pszPrjFile, "r");
    if (fp != nullptr)
    {
        VSIFCloseL(fp);

        char **papszLines = CSLLoad(pszPrjFile);

        poDS->m_oSRS.importFromESRI(papszLines);

        CSLDestroy(papszLines);
    }

    if (dfULXMap != 0.5 || dfULYMap != 0.5 || dfXDim != 1.0 || dfYDim != 1.0)
    {
        poDS->bGotTransform = TRUE;
        poDS->adfGeoTransform[0] = dfULXMap;
        poDS->adfGeoTransform[1] = dfXDim;
        poDS->adfGeoTransform[2] = 0.0;
        poDS->adfGeoTransform[3] = dfULYMap;
        poDS->adfGeoTransform[4] = 0.0;
        poDS->adfGeoTransform[5] = dfYDim;
    }

    if (!poDS->bGotTransform)
        poDS->bGotTransform = GDALReadWorldFile(poOpenInfo->pszFilename, "cbw",
                                                poDS->adfGeoTransform);

    if (!poDS->bGotTransform)
        poDS->bGotTransform = GDALReadWorldFile(poOpenInfo->pszFilename, "wld",
                                                poDS->adfGeoTransform);

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

    /* -------------------------------------------------------------------- */
    /*      Check for overviews.                                            */
    /* -------------------------------------------------------------------- */
    poDS->oOvManager.Initialize(poDS.get(), poOpenInfo->pszFilename);

    return poDS.release();
}

/************************************************************************/
/*                             GetKeyword()                             */
/************************************************************************/

const char *ISIS2Dataset::GetKeyword(const char *pszPath,
                                     const char *pszDefault)

{
    return oKeywords.GetKeyword(pszPath, pszDefault);
}

/************************************************************************/
/*                            GetKeywordSub()                           */
/************************************************************************/

const char *ISIS2Dataset::GetKeywordSub(const char *pszPath, int iSubscript,
                                        const char *pszDefault)

{
    const char *pszResult = oKeywords.GetKeyword(pszPath, nullptr);

    if (pszResult == nullptr)
        return pszDefault;

    if (pszResult[0] != '(')
        return pszDefault;

    char **papszTokens =
        CSLTokenizeString2(pszResult, "(,)", CSLT_HONOURSTRINGS);

    if (iSubscript <= CSLCount(papszTokens))
    {
        oTempResult = papszTokens[iSubscript - 1];
        CSLDestroy(papszTokens);
        return oTempResult.c_str();
    }

    CSLDestroy(papszTokens);
    return pszDefault;
}

/************************************************************************/
/*                            CleanString()                             */
/*                                                                      */
/* Removes single or double quotes, and converts spaces to underscores. */
/* The change is made in-place to CPLString.                            */
/************************************************************************/

void ISIS2Dataset::CleanString(CPLString &osInput)

{
    if ((osInput.size() < 2) ||
        ((osInput.at(0) != '"' || osInput.back() != '"') &&
         (osInput.at(0) != '\'' || osInput.back() != '\'')))
        return;

    char *pszWrk = CPLStrdup(osInput.c_str() + 1);

    pszWrk[strlen(pszWrk) - 1] = '\0';

    for (int i = 0; pszWrk[i] != '\0'; i++)
    {
        if (pszWrk[i] == ' ')
            pszWrk[i] = '_';
    }

    osInput = pszWrk;
    CPLFree(pszWrk);
}

/************************************************************************/
/*                           Create()                                   */
/************************************************************************/
/**
 * Hidden Creation Options:
 * INTERLEAVE=BSQ/BIP/BIL: Force the generation specified type of interleaving.
 *  BSQ --- band sequental (default),
 *  BIP --- band interleaved by pixel,
 *  BIL --- band interleaved by line.
 * OBJECT=QUBE/IMAGE/SPECTRAL_QUBE, if null default is QUBE
 */

GDALDataset *ISIS2Dataset::Create(const char *pszFilename, int nXSize,
                                  int nYSize, int nBandsIn, GDALDataType eType,
                                  char **papszParamList)
{

    /* Verify settings. In Isis 2 core pixel values can be represented in
     * three different ways : 1, 2 4, or 8 Bytes */
    if (eType != GDT_Byte && eType != GDT_Int16 && eType != GDT_Float32 &&
        eType != GDT_UInt16 && eType != GDT_Float64)
    {
        CPLError(
            CE_Failure, CPLE_AppDefined,
            "The ISIS2 driver does not supporting creating files of type %s.",
            GDALGetDataTypeName(eType));
        return nullptr;
    }

    /*  (SAMPLE, LINE, BAND) - Band Sequential (BSQ) - default choice
        (SAMPLE, BAND, LINE) - Band Interleaved by Line (BIL)
        (BAND, SAMPLE, LINE) - Band Interleaved by Pixel (BIP) */
    const char *pszInterleaving = "(SAMPLE,LINE,BAND)";
    const char *pszInterleavingParam =
        CSLFetchNameValue(papszParamList, "INTERLEAVE");
    if (pszInterleavingParam)
    {
        if (STARTS_WITH_CI(pszInterleavingParam, "bip"))
            pszInterleaving = "(BAND,SAMPLE,LINE)";
        else if (STARTS_WITH_CI(pszInterleavingParam, "bil"))
            pszInterleaving = "(SAMPLE,BAND,LINE)";
        else
            pszInterleaving = "(SAMPLE,LINE,BAND)";
    }

    /* default labeling method is attached */
    bool bAttachedLabelingMethod = true;
    /* check if labeling method is set : check the all three first chars */
    const char *pszLabelingMethod =
        CSLFetchNameValue(papszParamList, "LABELING_METHOD");
    if (pszLabelingMethod)
    {
        if (STARTS_WITH_CI(pszLabelingMethod, "det" /* "detached" */))
        {
            bAttachedLabelingMethod = false;
        }
        if (STARTS_WITH_CI(pszLabelingMethod, "att" /* attached" */))
        {
            bAttachedLabelingMethod = true;
        }
    }

    /*  set the label and data files */
    CPLString osLabelFile, osRasterFile, osOutFile;
    if (bAttachedLabelingMethod)
    {
        osLabelFile = "";
        osRasterFile = pszFilename;
        osOutFile = osRasterFile;
    }
    else
    {
        CPLString sExtension = "cub";
        const char *pszExtension =
            CSLFetchNameValue(papszParamList, "IMAGE_EXTENSION");
        if (pszExtension)
        {
            sExtension = pszExtension;
        }

        if (EQUAL(CPLGetExtension(pszFilename), sExtension))
        {
            CPLError(CE_Failure, CPLE_AppDefined,
                     "IMAGE_EXTENSION (%s) cannot match LABEL file extension.",
                     sExtension.c_str());
            return nullptr;
        }

        osLabelFile = pszFilename;
        osRasterFile = CPLResetExtension(osLabelFile, sExtension);
        osOutFile = osLabelFile;
    }

    const char *pszObject = CSLFetchNameValue(papszParamList, "OBJECT");
    CPLString sObject = "QUBE";  // default choice
    if (pszObject)
    {
        if (EQUAL(pszObject, "IMAGE"))
        {
            sObject = "IMAGE";
        }
        if (EQUAL(pszObject, "SPECTRAL_QUBE"))
        {
            sObject = "SPECTRAL_QUBE";
        }
    }

    GUIntBig iRecords =
        ISIS2Dataset::RecordSizeCalculation(nXSize, nYSize, nBandsIn, eType);
    GUIntBig iLabelRecords(2);

    CPLDebug("ISIS2", "irecord = %i", static_cast<int>(iRecords));

    if (bAttachedLabelingMethod)
    {
        ISIS2Dataset::WriteLabel(osRasterFile, "", sObject, nXSize, nYSize,
                                 nBandsIn, eType, iRecords, pszInterleaving,
                                 iLabelRecords, true);
    }
    else
    {
        ISIS2Dataset::WriteLabel(osLabelFile, osRasterFile, sObject, nXSize,
                                 nYSize, nBandsIn, eType, iRecords,
                                 pszInterleaving, iLabelRecords);
    }

    if (!ISIS2Dataset::WriteRaster(osRasterFile, bAttachedLabelingMethod,
                                   iRecords, iLabelRecords, eType,
                                   pszInterleaving))
        return nullptr;

    return GDALDataset::FromHandle(GDALOpen(osOutFile, GA_Update));
}

/************************************************************************/
/*                            WriteRaster()                             */
/************************************************************************/

int ISIS2Dataset::WriteRaster(CPLString osFilename, bool includeLabel,
                              GUIntBig iRecords, GUIntBig iLabelRecords,
                              CPL_UNUSED GDALDataType eType,
                              CPL_UNUSED const char *pszInterleaving)
{
    CPLString pszAccess("wb");
    if (includeLabel)
        pszAccess = "ab";

    VSILFILE *fpBin = VSIFOpenL(osFilename, pszAccess.c_str());
    if (fpBin == nullptr)
    {
        CPLError(CE_Failure, CPLE_FileIO, "Failed to create %s:\n%s",
                 osFilename.c_str(), VSIStrerror(errno));
        return FALSE;
    }

    GUIntBig nSize = iRecords * RECORD_SIZE;
    CPLDebug("ISIS2", "nSize = %i", static_cast<int>(nSize));

    if (includeLabel)
        nSize = iLabelRecords * RECORD_SIZE + nSize;

    // write last byte
    const GByte byZero(0);
    if (VSIFSeekL(fpBin, nSize - 1, SEEK_SET) != 0 ||
        VSIFWriteL(&byZero, 1, 1, fpBin) != 1)
    {
        CPLError(CE_Failure, CPLE_FileIO, "Failed to write %s:\n%s",
                 osFilename.c_str(), VSIStrerror(errno));
        VSIFCloseL(fpBin);
        return FALSE;
    }
    VSIFCloseL(fpBin);

    return TRUE;
}

/************************************************************************/
/*                       RecordSizeCalculation()                        */
/************************************************************************/
GUIntBig ISIS2Dataset::RecordSizeCalculation(unsigned int nXSize,
                                             unsigned int nYSize,
                                             unsigned int nBandsIn,
                                             GDALDataType eType)

{
    const GUIntBig n = static_cast<GUIntBig>(nXSize) * nYSize * nBandsIn *
                       (GDALGetDataTypeSize(eType) / 8);
    // size of pds file is a multiple of RECORD_SIZE Bytes.
    CPLDebug("ISIS2", "n = %i", static_cast<int>(n));
    CPLDebug("ISIS2", "RECORD SIZE = %i", RECORD_SIZE);
    CPLDebug("ISIS2", "nXSize = %i", nXSize);
    CPLDebug("ISIS2", "nYSize = %i", nYSize);
    CPLDebug("ISIS2", "nBands = %i", nBandsIn);
    CPLDebug("ISIS2", "DataTypeSize = %i", GDALGetDataTypeSize(eType));
    return static_cast<GUIntBig>(ceil(static_cast<float>(n) / RECORD_SIZE));
}

/************************************************************************/
/*                       WriteQUBE_Information()                        */
/************************************************************************/

int ISIS2Dataset::WriteQUBE_Information(
    VSILFILE *fpLabel, unsigned int iLevel, unsigned int &nWritingBytes,
    unsigned int nXSize, unsigned int nYSize, unsigned int nBandsIn,
    GDALDataType eType, const char *pszInterleaving)

{
    nWritingBytes += ISIS2Dataset::WriteFormatting(fpLabel, "");
    nWritingBytes +=
        ISIS2Dataset::WriteFormatting(fpLabel, "/* Qube structure */");
    nWritingBytes +=
        ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "OBJECT", "QUBE");
    iLevel++;
    nWritingBytes += ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "AXES", "3");
    nWritingBytes += ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "AXIS_NAME",
                                                pszInterleaving);
    nWritingBytes +=
        ISIS2Dataset::WriteFormatting(fpLabel, "/* Core description */");

    CPLDebug("ISIS2", "%d,%d,%d", nXSize, nYSize, nBandsIn);

    nWritingBytes += ISIS2Dataset::WriteKeyword(
        fpLabel, iLevel, "CORE_ITEMS",
        CPLString().Printf("(%d,%d,%d)", nXSize, nYSize, nBandsIn));
    nWritingBytes += ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "CORE_NAME",
                                                "\"RAW DATA NUMBER\"");
    nWritingBytes +=
        ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "CORE_UNIT", "\"N/A\"");
    // TODO change for eType

    if (eType == GDT_Byte)
    {
        nWritingBytes += ISIS2Dataset::WriteKeyword(
            fpLabel, iLevel, "CORE_ITEM_TYPE", "PC_UNSIGNED_INTEGER");
        nWritingBytes +=
            ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "CORE_ITEM_BYTES", "1");
    }
    else if (eType == GDT_UInt16)
    {
        nWritingBytes += ISIS2Dataset::WriteKeyword(
            fpLabel, iLevel, "CORE_ITEM_TYPE", "PC_UNSIGNED_INTEGER");
        nWritingBytes +=
            ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "CORE_ITEM_BYTES", "2");
    }
    else if (eType == GDT_Int16)
    {
        nWritingBytes += ISIS2Dataset::WriteKeyword(
            fpLabel, iLevel, "CORE_ITEM_TYPE", "PC_INTEGER");
        nWritingBytes +=
            ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "CORE_ITEM_BYTES", "2");
    }
    else if (eType == GDT_Float32)
    {
        nWritingBytes += ISIS2Dataset::WriteKeyword(
            fpLabel, iLevel, "CORE_ITEM_TYPE", "PC_REAL");
        nWritingBytes +=
            ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "CORE_ITEM_BYTES", "4");
    }
    else if (eType == GDT_Float64)
    {
        nWritingBytes += ISIS2Dataset::WriteKeyword(
            fpLabel, iLevel, "CORE_ITEM_TYPE", "PC_REAL");
        nWritingBytes +=
            ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "CORE_ITEM_BYTES", "8");
    }

    // TODO add core null value

    nWritingBytes +=
        ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "CORE_BASE", "0.0");
    nWritingBytes +=
        ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "CORE_MULTIPLIER", "1.0");
    nWritingBytes +=
        ISIS2Dataset::WriteFormatting(fpLabel, "/* Suffix description */");
    nWritingBytes +=
        ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "SUFFIX_BYTES", "4");
    nWritingBytes += ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "SUFFIX_ITEMS",
                                                "( 0, 0, 0)");
    iLevel--;
    nWritingBytes +=
        ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "END_OBJECT", "QUBE");

    return TRUE;
}

/************************************************************************/
/*                             WriteLabel()                             */
/*                                                                      */
/*      osRasterFile : name of raster file but if it is empty we        */
/*                     have only one file with an attached label        */
/*      sObjectTag : QUBE, IMAGE or SPECTRAL_QUBE                       */
/*      bRelaunch : flag to allow recursive call                        */
/************************************************************************/

int ISIS2Dataset::WriteLabel(CPLString osFilename, CPLString osRasterFile,
                             CPLString sObjectTag, unsigned int nXSize,
                             unsigned int nYSize, unsigned int nBandsIn,
                             GDALDataType eType, GUIntBig iRecords,
                             const char *pszInterleaving,
                             GUIntBig &iLabelRecords, CPL_UNUSED bool bRelaunch)
{
    CPLDebug("ISIS2", "Write Label filename = %s, rasterfile = %s",
             osFilename.c_str(), osRasterFile.c_str());
    bool bAttachedLabel = EQUAL(osRasterFile, "");

    VSILFILE *fpLabel = VSIFOpenL(osFilename, "w");

    if (fpLabel == nullptr)
    {
        CPLError(CE_Failure, CPLE_FileIO, "Failed to create %s:\n%s",
                 osFilename.c_str(), VSIStrerror(errno));
        return FALSE;
    }

    const unsigned int iLevel(0);
    unsigned int nWritingBytes(0);

    /* write common header */
    nWritingBytes +=
        ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "PDS_VERSION_ID", "PDS3");
    nWritingBytes += ISIS2Dataset::WriteFormatting(fpLabel, "");
    nWritingBytes += ISIS2Dataset::WriteFormatting(
        fpLabel, "/* File identification and structure */");
    nWritingBytes += ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "RECORD_TYPE",
                                                "FIXED_LENGTH");
    nWritingBytes += ISIS2Dataset::WriteKeyword(
        fpLabel, iLevel, "RECORD_BYTES", CPLString().Printf("%d", RECORD_SIZE));
    nWritingBytes +=
        ISIS2Dataset::WriteKeyword(fpLabel, iLevel, "FILE_RECORDS",
                                   CPLString().Printf(CPL_FRMT_GUIB, iRecords));
    nWritingBytes += ISIS2Dataset::WriteKeyword(
        fpLabel, iLevel, "LABEL_RECORDS",
        CPLString().Printf(CPL_FRMT_GUIB, iLabelRecords));
    if (!bAttachedLabel)
    {
        nWritingBytes += ISIS2Dataset::WriteKeyword(
            fpLabel, iLevel, "FILE_NAME", CPLGetFilename(osRasterFile));
    }
    nWritingBytes += ISIS2Dataset::WriteFormatting(fpLabel, "");

    nWritingBytes += ISIS2Dataset::WriteFormatting(
        fpLabel, "/* Pointers to Data Objects */");

    if (bAttachedLabel)
    {
        nWritingBytes += ISIS2Dataset::WriteKeyword(
            fpLabel, iLevel, CPLString().Printf("^%s", sObjectTag.c_str()),
            CPLString().Printf(CPL_FRMT_GUIB, iLabelRecords + 1));
    }
    else
    {
        nWritingBytes += ISIS2Dataset::WriteKeyword(
            fpLabel, iLevel, CPLString().Printf("^%s", sObjectTag.c_str()),
            CPLString().Printf("(\"%s\",1)", CPLGetFilename(osRasterFile)));
    }

    if (EQUAL(sObjectTag, "QUBE"))
    {
        ISIS2Dataset::WriteQUBE_Information(fpLabel, iLevel, nWritingBytes,
                                            nXSize, nYSize, nBandsIn, eType,
                                            pszInterleaving);
    }

    nWritingBytes += ISIS2Dataset::WriteFormatting(fpLabel, "END");

    // check if file record is correct
    const unsigned int q = nWritingBytes / RECORD_SIZE;
    if (q <= iLabelRecords)
    {
        // correct we add space after the label end for complete from
        // iLabelRecords
        unsigned int nSpaceBytesToWrite = static_cast<unsigned int>(
            iLabelRecords * RECORD_SIZE - nWritingBytes);
        VSIFPrintfL(fpLabel, "%*c", nSpaceBytesToWrite, ' ');
    }
    else
    {
        iLabelRecords = q + 1;
        ISIS2Dataset::WriteLabel(osFilename, osRasterFile, sObjectTag, nXSize,
                                 nYSize, nBandsIn, eType, iRecords,
                                 pszInterleaving, iLabelRecords);
    }
    VSIFCloseL(fpLabel);

    return TRUE;
}

/************************************************************************/
/*                            WriteKeyword()                            */
/************************************************************************/

unsigned int ISIS2Dataset::WriteKeyword(VSILFILE *fpLabel, unsigned int iLevel,
                                        CPLString key, CPLString value)

{
    CPLString tab = "";
    iLevel *= 4;  // each struct is indented by 4 spaces.

    return VSIFPrintfL(fpLabel, "%*s%s=%s\n", iLevel, tab.c_str(), key.c_str(),
                       value.c_str());
}

/************************************************************************/
/*                          WriteFormatting()                           */
/************************************************************************/

unsigned int ISIS2Dataset::WriteFormatting(VSILFILE *fpLabel, CPLString data)

{
    return VSIFPrintfL(fpLabel, "%s\n", data.c_str());
}

/************************************************************************/
/*                         GDALRegister_ISIS2()                         */
/************************************************************************/

void GDALRegister_ISIS2()

{
    if (GDALGetDriverByName("ISIS2") != nullptr)
        return;

    GDALDriver *poDriver = new GDALDriver();

    poDriver->SetDescription("ISIS2");
    poDriver->SetMetadataItem(GDAL_DCAP_RASTER, "YES");
    poDriver->SetMetadataItem(GDAL_DMD_LONGNAME,
                              "USGS Astrogeology ISIS cube (Version 2)");
    poDriver->SetMetadataItem(GDAL_DMD_HELPTOPIC, "drivers/raster/isis2.html");
    poDriver->SetMetadataItem(GDAL_DCAP_VIRTUALIO, "YES");
    poDriver->SetMetadataItem(GDAL_DMD_CREATIONDATATYPES,
                              "Byte Int16 UInt16 Float32 Float64");

    poDriver->SetMetadataItem(
        GDAL_DMD_CREATIONOPTIONLIST,
        "<CreationOptionList>\n"
        "   <Option name='LABELING_METHOD' type='string-select' "
        "default='ATTACHED'>\n"
        "     <Value>ATTACHED</Value>"
        "     <Value>DETACHED</Value>"
        "   </Option>"
        "   <Option name='IMAGE_EXTENSION' type='string' default='cub'/>\n"
        "</CreationOptionList>\n");

    poDriver->pfnIdentify = ISIS2Dataset::Identify;
    poDriver->pfnOpen = ISIS2Dataset::Open;
    poDriver->pfnCreate = ISIS2Dataset::Create;

    GetGDALDriverManager()->RegisterDriver(poDriver);
}
