/******************************************************************************
 *
 * Project:  PCIDSK Database File
 * Purpose:  Read/write PCIDSK Database File used by the PCI software, using
 *           the external PCIDSK library.
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *
 ******************************************************************************
 * Copyright (c) 2009, Frank Warmerdam <warmerdam@pobox.com>
 * Copyright (c) 2009-2013, Even Rouault <even dot rouault at spatialys.com>
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#include "gdal_frmts.h"
#include "pcidskdataset2.h"
#include "pcidskdrivercore.h"

#include <algorithm>

const PCIDSK::PCIDSKInterfaces *PCIDSK2GetInterfaces(void);

/************************************************************************/
/* ==================================================================== */
/*                            PCIDSK2Band                               */
/* ==================================================================== */
/************************************************************************/

/************************************************************************/
/*                            PCIDSK2Band()                             */
/*                                                                      */
/*      This constructor is used for main file channels.                */
/************************************************************************/

PCIDSK2Band::PCIDSK2Band(PCIDSKFile *poFileIn, PCIDSKChannel *poChannelIn)

{
    Initialize();

    poFile = poFileIn;
    poChannel = poChannelIn;

    nBlockXSize = static_cast<int>(poChannel->GetBlockWidth());
    nBlockYSize = static_cast<int>(poChannel->GetBlockHeight());

    eDataType = PCIDSK2Dataset::PCIDSKTypeToGDAL(poChannel->GetType());

    if (!STARTS_WITH_CI(poChannel->GetDescription().c_str(),
                        "Contents Not Specified"))
        GDALMajorObject::SetDescription(poChannel->GetDescription().c_str());

    /* -------------------------------------------------------------------- */
    /*      Do we have overviews?                                           */
    /* -------------------------------------------------------------------- */
    RefreshOverviewList();
}

/************************************************************************/
/*                            PCIDSK2Band()                             */
/*                                                                      */
/*      This constructor is used for overviews and bitmap segments      */
/*      as bands.                                                       */
/************************************************************************/

PCIDSK2Band::PCIDSK2Band(PCIDSKChannel *poChannelIn)

{
    Initialize();

    this->poChannel = poChannelIn;

    nBand = 1;

    nBlockXSize = static_cast<int>(poChannel->GetBlockWidth());
    nBlockYSize = static_cast<int>(poChannel->GetBlockHeight());

    nRasterXSize = static_cast<int>(poChannel->GetWidth());
    nRasterYSize = static_cast<int>(poChannel->GetHeight());

    eDataType = PCIDSK2Dataset::PCIDSKTypeToGDAL(poChannel->GetType());

    if (poChannel->GetType() == CHN_BIT)
    {
        PCIDSK2Band::SetMetadataItem("NBITS", "1", "IMAGE_STRUCTURE");

        if (!STARTS_WITH_CI(poChannel->GetDescription().c_str(),
                            "Contents Not Specified"))
            GDALMajorObject::SetDescription(
                poChannel->GetDescription().c_str());
    }
}

/************************************************************************/
/*                             Initialize()                             */
/************************************************************************/

void PCIDSK2Band::Initialize()

{
    papszLastMDListValue = nullptr;

    poChannel = nullptr;
    poFile = nullptr;
    poDS = nullptr;

    bCheckedForColorTable = false;
    poColorTable = nullptr;
    nPCTSegNumber = -1;

    papszCategoryNames = nullptr;
}

/************************************************************************/
/*                            ~PCIDSK2Band()                            */
/************************************************************************/

PCIDSK2Band::~PCIDSK2Band()

{
    while (!apoOverviews.empty())
    {
        delete apoOverviews.back();
        apoOverviews.pop_back();
    }
    CSLDestroy(papszLastMDListValue);
    CSLDestroy(papszCategoryNames);

    delete poColorTable;
}

/************************************************************************/
/*                           SetDescription()                           */
/************************************************************************/

void PCIDSK2Band::SetDescription(const char *pszDescription)

{
    if (GetAccess() == GA_ReadOnly)
    {
        CPLError(CE_Failure, CPLE_NoWriteAccess,
                 "Unable to set description on read-only file.");
        return;
    }

    try
    {
        poChannel->SetDescription(pszDescription);

        if (!STARTS_WITH_CI(poChannel->GetDescription().c_str(),
                            "Contents Not Specified"))
            GDALMajorObject::SetDescription(
                poChannel->GetDescription().c_str());
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
    }
}

/************************************************************************/
/*                          GetCategoryNames()                          */
/*                                                                      */
/*      Offer category names from Class_*_ metadata.                    */
/************************************************************************/

char **PCIDSK2Band::GetCategoryNames()

{
    // already scanned?
    if (papszCategoryNames != nullptr)
        return papszCategoryNames;

    try
    {
        std::vector<std::string> aosMDKeys = poChannel->GetMetadataKeys();
        int nClassCount = 0;
        constexpr int nMaxClasses = 10000;
        papszCategoryNames = reinterpret_cast<char **>(
            CPLCalloc(nMaxClasses + 1, sizeof(char *)));

        for (size_t i = 0; i < aosMDKeys.size(); i++)
        {
            CPLString osKey = aosMDKeys[i];

            // is this a "Class_n_name" keyword?
            if (!STARTS_WITH_CI(osKey, "Class_"))
                continue;

            if (!EQUAL(osKey.c_str() + osKey.size() - 5, "_name"))
                continue;

            // Ignore unreasonable class values.
            int iClass = atoi(osKey.c_str() + 6);

            if (iClass < 0 || iClass > 10000)
                continue;

            // Fetch the name.
            CPLString osName = poChannel->GetMetadataValue(osKey);

            // do we need to put in place dummy class names for missing values?
            if (iClass >= nClassCount)
            {
                while (iClass >= nClassCount)
                {
                    papszCategoryNames[nClassCount++] = CPLStrdup("");
                    papszCategoryNames[nClassCount] = nullptr;
                }
            }

            // Replace target category name.
            CPLFree(papszCategoryNames[iClass]);
            papszCategoryNames[iClass] = nullptr;

            papszCategoryNames[iClass] = CPLStrdup(osName);
        }

        if (nClassCount == 0)
            return GDALPamRasterBand::GetCategoryNames();

        return papszCategoryNames;
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return nullptr;
    }
}

/************************************************************************/
/*                         CheckForColorTable()                         */
/************************************************************************/

bool PCIDSK2Band::CheckForColorTable()

{
    if (bCheckedForColorTable || poFile == nullptr)
        return true;

    bCheckedForColorTable = true;

    try
    {
        /* --------------------------------------------------------------------
         */
        /*      Try to find an appropriate PCT segment to use. */
        /* --------------------------------------------------------------------
         */
        std::string osDefaultPCT =
            poChannel->GetMetadataValue("DEFAULT_PCT_REF");
        PCIDSKSegment *poPCTSeg = nullptr;

        // If there is no metadata, assume a single PCT in a file with only
        // one raster band must be intended for it.
        if (osDefaultPCT.empty() && poDS != nullptr &&
            poDS->GetRasterCount() == 1)
        {
            poPCTSeg = poFile->GetSegment(SEG_PCT, "");
            if (poPCTSeg != nullptr &&
                poFile->GetSegment(SEG_PCT, "", poPCTSeg->GetSegmentNumber()) !=
                    nullptr)
                poPCTSeg = nullptr;
        }
        // Parse default PCT ref assuming an in file reference.
        else if (!osDefaultPCT.empty() &&
                 strstr(osDefaultPCT.c_str(), "PCT:") != nullptr)
        {
            poPCTSeg = poFile->GetSegment(
                atoi(strstr(osDefaultPCT.c_str(), "PCT:") + 4));
        }

        if (poPCTSeg != nullptr)
        {
            poColorTable = new GDALColorTable();
            unsigned char abyPCT[768];

            PCIDSK_PCT *poPCT = dynamic_cast<PCIDSK_PCT *>(poPCTSeg);
            if (poPCT)
            {
                nPCTSegNumber = poPCTSeg->GetSegmentNumber();

                poPCT->ReadPCT(abyPCT);

                for (int i = 0; i < 256; i++)
                {
                    GDALColorEntry sEntry;

                    sEntry.c1 = abyPCT[256 * 0 + i];
                    sEntry.c2 = abyPCT[256 * 1 + i];
                    sEntry.c3 = abyPCT[256 * 2 + i];
                    sEntry.c4 = 255;
                    poColorTable->SetColorEntry(i, &sEntry);
                }
            }
        }

        /* --------------------------------------------------------------------
         */
        /*      If we did not find an appropriate PCT segment, check for */
        /*      Class_n color data from which to construct a color table. */
        /* --------------------------------------------------------------------
         */
        std::vector<std::string> aosMDKeys = poChannel->GetMetadataKeys();

        for (size_t i = 0; i < aosMDKeys.size(); i++)
        {
            CPLString osKey = aosMDKeys[i];

            // is this a "Class_n_name" keyword?

            if (!STARTS_WITH_CI(osKey, "Class_"))
                continue;

            if (!EQUAL(osKey.c_str() + osKey.size() - 6, "_Color"))
                continue;

            // Ignore unreasonable class values.
            const int iClass = atoi(osKey.c_str() + 6);

            if (iClass < 0 || iClass > 10000)
                continue;

            // Fetch and parse the RGB value "(RGB:red green blue)"
            CPLString osRGB = poChannel->GetMetadataValue(osKey);

            if (!STARTS_WITH_CI(osRGB, "(RGB:"))
                continue;

            int nRed, nGreen, nBlue;
            if (sscanf(osRGB.c_str() + 5, "%d %d %d", &nRed, &nGreen, &nBlue) !=
                3)
                continue;

            // we have an entry - apply to the color table.
            GDALColorEntry sEntry;

            sEntry.c1 = (short)nRed;
            sEntry.c2 = (short)nGreen;
            sEntry.c3 = (short)nBlue;
            sEntry.c4 = 255;

            if (poColorTable == nullptr)
            {
                CPLDebug("PCIDSK",
                         "Using Class_n_Color metadata for color table.");
                poColorTable = new GDALColorTable();
            }

            poColorTable->SetColorEntry(iClass, &sEntry);
        }
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return false;
    }

    return true;
}

/************************************************************************/
/*                           GetColorTable()                            */
/************************************************************************/

GDALColorTable *PCIDSK2Band::GetColorTable()

{
    CheckForColorTable();

    if (poColorTable)
        return poColorTable;

    return GDALPamRasterBand::GetColorTable();
}

/************************************************************************/
/*                           SetColorTable()                            */
/************************************************************************/

CPLErr PCIDSK2Band::SetColorTable(GDALColorTable *poCT)

{
    if (!CheckForColorTable())
        return CE_Failure;

    // no color tables on overviews.
    if (poFile == nullptr)
        return CE_Failure;

    if (GetAccess() == GA_ReadOnly)
    {
        CPLError(CE_Failure, CPLE_NoWriteAccess,
                 "Unable to set color table on read-only file.");
        return CE_Failure;
    }

    try
    {
        /* --------------------------------------------------------------------
         */
        /*      Are we trying to delete the color table? */
        /* --------------------------------------------------------------------
         */
        if (poCT == nullptr)
        {
            delete poColorTable;
            poColorTable = nullptr;

            if (nPCTSegNumber != -1)
                poFile->DeleteSegment(nPCTSegNumber);
            poChannel->SetMetadataValue("DEFAULT_PCT_REF", "");
            nPCTSegNumber = -1;

            return CE_None;
        }

        /* --------------------------------------------------------------------
         */
        /*      Do we need to create the segment?  If so, also set the */
        /*      default pct metadata. */
        /* --------------------------------------------------------------------
         */
        if (nPCTSegNumber == -1)
        {
            nPCTSegNumber = poFile->CreateSegment(
                "PCTTable", "Default Pseudo-Color Table", SEG_PCT, 0);

            CPLString osRef;
            osRef.Printf("gdb:/{PCT:%d}", nPCTSegNumber);
            poChannel->SetMetadataValue("DEFAULT_PCT_REF", osRef);
        }

        /* --------------------------------------------------------------------
         */
        /*      Write out the PCT. */
        /* --------------------------------------------------------------------
         */
        const int nColorCount = std::min(256, poCT->GetColorEntryCount());

        unsigned char abyPCT[768];
        memset(abyPCT, 0, 768);

        for (int i = 0; i < nColorCount; i++)
        {
            GDALColorEntry sEntry;

            poCT->GetColorEntryAsRGB(i, &sEntry);
            abyPCT[256 * 0 + i] = (unsigned char)sEntry.c1;
            abyPCT[256 * 1 + i] = (unsigned char)sEntry.c2;
            abyPCT[256 * 2 + i] = (unsigned char)sEntry.c3;
        }

        PCIDSK_PCT *poPCT =
            dynamic_cast<PCIDSK_PCT *>(poFile->GetSegment(nPCTSegNumber));
        if (poPCT)
            poPCT->WritePCT(abyPCT);

        delete poColorTable;
        poColorTable = poCT->Clone();
    }

    /* -------------------------------------------------------------------- */
    /*      Trap exceptions.                                                */
    /* -------------------------------------------------------------------- */
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return CE_Failure;
    }

    return CE_None;
}

/************************************************************************/
/*                       GetColorInterpretation()                       */
/************************************************************************/

GDALColorInterp PCIDSK2Band::GetColorInterpretation()

{
    CheckForColorTable();

    if (poColorTable != nullptr)
        return GCI_PaletteIndex;

    return GDALPamRasterBand::GetColorInterpretation();
}

/************************************************************************/
/*                        RefreshOverviewList()                         */
/************************************************************************/

void PCIDSK2Band::RefreshOverviewList()

{
    /* -------------------------------------------------------------------- */
    /*      Clear existing overviews.                                       */
    /* -------------------------------------------------------------------- */
    while (!apoOverviews.empty())
    {
        delete apoOverviews.back();
        apoOverviews.pop_back();
    }

    /* -------------------------------------------------------------------- */
    /*      Fetch overviews.                                                */
    /* -------------------------------------------------------------------- */
    for (int iOver = 0; iOver < poChannel->GetOverviewCount(); iOver++)
    {
        auto poOvrBand = new PCIDSK2Band(poChannel->GetOverview(iOver));
        poOvrBand->eAccess = eAccess;
        apoOverviews.push_back(poOvrBand);
    }
}

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

CPLErr PCIDSK2Band::IReadBlock(int iBlockX, int iBlockY, void *pData)

{
    try
    {
        poChannel->ReadBlock(iBlockX + iBlockY * nBlocksPerRow, pData);

        // Do we need to upsample 1bit to 8bit?
        if (poChannel->GetType() == CHN_BIT)
        {
            GByte *pabyData = reinterpret_cast<GByte *>(pData);

            for (int ii = nBlockXSize * nBlockYSize - 1; ii >= 0; ii--)
            {
                if ((pabyData[ii >> 3] & (0x80 >> (ii & 0x7))))
                    pabyData[ii] = 1;
                else
                    pabyData[ii] = 0;
            }
        }

        return CE_None;
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return CE_Failure;
    }
}

/************************************************************************/
/*                             IWriteBlock()                            */
/************************************************************************/

CPLErr PCIDSK2Band::IWriteBlock(int iBlockX, int iBlockY, void *pData)

{
    try
    {
        poChannel->WriteBlock(iBlockX + iBlockY * nBlocksPerRow, pData);
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return CE_Failure;
    }

    return CE_None;
}

/************************************************************************/
/*                          GetOverviewCount()                          */
/************************************************************************/

int PCIDSK2Band::GetOverviewCount()

{
    if (!apoOverviews.empty())
        return static_cast<int>(apoOverviews.size());

    return GDALPamRasterBand::GetOverviewCount();
}

/************************************************************************/
/*                            GetOverview()                             */
/************************************************************************/

GDALRasterBand *PCIDSK2Band::GetOverview(int iOverview)

{
    if (iOverview < 0 || iOverview >= static_cast<int>(apoOverviews.size()))
        return GDALPamRasterBand::GetOverview(iOverview);

    return apoOverviews[iOverview];
}

/************************************************************************/
/*                            SetMetadata()                             */
/************************************************************************/

CPLErr PCIDSK2Band::SetMetadata(char **papszMD, const char *pszDomain)

{
    /* -------------------------------------------------------------------- */
    /*      PCIDSK only supports metadata in the default domain.            */
    /* -------------------------------------------------------------------- */
    if (pszDomain != nullptr && strlen(pszDomain) > 0)
        return GDALPamRasterBand::SetMetadata(papszMD, pszDomain);

    /* -------------------------------------------------------------------- */
    /*      Set each item individually.                                     */
    /* -------------------------------------------------------------------- */
    CSLDestroy(papszLastMDListValue);
    papszLastMDListValue = nullptr;
    m_oCacheMetadataItem.clear();

    if (GetAccess() == GA_ReadOnly)
    {
        CPLError(CE_Failure, CPLE_NoWriteAccess,
                 "Unable to set metadata on read-only file.");
        return CE_Failure;
    }

    try
    {
        for (int iItem = 0; papszMD && papszMD[iItem]; iItem++)
        {
            char *pszItemName = nullptr;

            const char *pszItemValue =
                CPLParseNameValue(papszMD[iItem], &pszItemName);
            if (pszItemName != nullptr)
            {
                poChannel->SetMetadataValue(pszItemName, pszItemValue);
                CPLFree(pszItemName);
            }
        }
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return CE_Failure;
    }

    return CE_None;
}

/************************************************************************/
/*                          SetMetadataItem()                           */
/************************************************************************/

CPLErr PCIDSK2Band::SetMetadataItem(const char *pszName, const char *pszValue,
                                    const char *pszDomain)

{
    /* -------------------------------------------------------------------- */
    /*      PCIDSK only supports metadata in the default domain.            */
    /* -------------------------------------------------------------------- */
    if (pszDomain != nullptr && strlen(pszDomain) > 0)
        return GDALPamRasterBand::SetMetadataItem(pszName, pszValue, pszDomain);

    /* -------------------------------------------------------------------- */
    /*      Set on the file.                                                */
    /* -------------------------------------------------------------------- */
    CSLDestroy(papszLastMDListValue);
    papszLastMDListValue = nullptr;
    m_oCacheMetadataItem.clear();

    if (GetAccess() == GA_ReadOnly)
    {
        CPLError(CE_Failure, CPLE_NoWriteAccess,
                 "Unable to set metadata on read-only file.");
        return CE_Failure;
    }

    try
    {
        if (!pszValue)
            pszValue = "";
        poChannel->SetMetadataValue(pszName, pszValue);
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return CE_Failure;
    }

    return CE_None;
}

/************************************************************************/
/*                      GetMetadataDomainList()                         */
/************************************************************************/

char **PCIDSK2Band::GetMetadataDomainList()
{
    return BuildMetadataDomainList(GDALPamRasterBand::GetMetadataDomainList(),
                                   TRUE, "", nullptr);
}

/************************************************************************/
/*                          GetMetadataItem()                           */
/************************************************************************/

const char *PCIDSK2Band::GetMetadataItem(const char *pszName,
                                         const char *pszDomain)

{
    /* -------------------------------------------------------------------- */
    /*      PCIDSK only supports metadata in the default domain.            */
    /* -------------------------------------------------------------------- */
    if (pszDomain != nullptr && strlen(pszDomain) > 0)
        return GDALPamRasterBand::GetMetadataItem(pszName, pszDomain);

    /* -------------------------------------------------------------------- */
    /*      Try and fetch (use cached value if available)                   */
    /* -------------------------------------------------------------------- */
    auto oIter = m_oCacheMetadataItem.find(pszName);
    if (oIter != m_oCacheMetadataItem.end())
    {
        return oIter->second.empty() ? nullptr : oIter->second.c_str();
    }

    CPLString osValue;
    try
    {
        osValue = poChannel->GetMetadataValue(pszName);
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return nullptr;
    }

    oIter = m_oCacheMetadataItem
                .insert(std::pair<std::string, std::string>(pszName, osValue))
                .first;
    return oIter->second.empty() ? nullptr : oIter->second.c_str();
}

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

char **PCIDSK2Band::GetMetadata(const char *pszDomain)

{
    /* -------------------------------------------------------------------- */
    /*      PCIDSK only supports metadata in the default domain.            */
    /* -------------------------------------------------------------------- */
    if (pszDomain != nullptr && strlen(pszDomain) > 0)
        return GDALPamRasterBand::GetMetadata(pszDomain);

    /* -------------------------------------------------------------------- */
    /*      If we have a cached result, just use that.                      */
    /* -------------------------------------------------------------------- */
    if (papszLastMDListValue != nullptr)
        return papszLastMDListValue;

    /* -------------------------------------------------------------------- */
    /*      Fetch and build the list.                                       */
    /* -------------------------------------------------------------------- */
    try
    {
        std::vector<std::string> aosKeys = poChannel->GetMetadataKeys();

        for (unsigned int i = 0; i < aosKeys.size(); i++)
        {
            if (aosKeys[i].c_str()[0] == '_')
                continue;

            papszLastMDListValue = CSLSetNameValue(
                papszLastMDListValue, aosKeys[i].c_str(),
                poChannel->GetMetadataValue(aosKeys[i]).c_str());
        }
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return nullptr;
    }

    return papszLastMDListValue;
}

/************************************************************************/
/* ==================================================================== */
/*                            PCIDSK2Dataset                            */
/* ==================================================================== */
/************************************************************************/

/************************************************************************/
/*                           PCIDSK2Dataset()                            */
/************************************************************************/

PCIDSK2Dataset::PCIDSK2Dataset()
    : papszLastMDListValue(nullptr), poFile(nullptr)
{
}

/************************************************************************/
/*                            ~PCIDSK2Dataset()                          */
/************************************************************************/

// FIXME? is an exception can really be thrown in the destructor, then it is
// very dangerous !
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4702) /*  unreachable code */
#endif
PCIDSK2Dataset::~PCIDSK2Dataset()
{
    PCIDSK2Dataset::FlushCache(true);

    while (!apoLayers.empty())
    {
        delete apoLayers.back();
        apoLayers.pop_back();
    }

    if (m_poSRS)
        m_poSRS->Release();

    try
    {
        if (poFile != nullptr)
            delete poFile;
    }

    /* -------------------------------------------------------------------- */
    /*      Trap exceptions.                                                */
    /* -------------------------------------------------------------------- */
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
    }
    catch (...)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "PCIDSK SDK Failure in Close(), unexpected exception.");
    }

    CSLDestroy(papszLastMDListValue);
}
#ifdef _MSC_VER
#pragma warning(pop)
#endif

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

char **PCIDSK2Dataset::GetFileList()

{
    char **papszFileList = GDALPamDataset::GetFileList();
    CPLString osBaseDir = CPLGetPath(GetDescription());

    try
    {
        for (int nChan = 1; nChan <= poFile->GetChannels(); nChan++)
        {
            PCIDSKChannel *poChannel = poFile->GetChannel(nChan);
            CPLString osChanFilename;
            uint64 image_offset, pixel_offset, line_offset;
            bool little_endian;

            poChannel->GetChanInfo(osChanFilename, image_offset, pixel_offset,
                                   line_offset, little_endian);

            if (osChanFilename != "")
            {
                papszFileList = CSLAddString(
                    papszFileList,
                    CPLProjectRelativeFilename(osBaseDir, osChanFilename));
            }
        }

        return papszFileList;
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return papszFileList;
    }
}

/************************************************************************/
/*                             ProcessRPC()                             */
/************************************************************************/

void PCIDSK2Dataset::ProcessRPC()

{
    /* -------------------------------------------------------------------- */
    /*      Search all BIN segments looking for an RPC segment.             */
    /* -------------------------------------------------------------------- */
    PCIDSKSegment *poSeg = poFile->GetSegment(SEG_BIN, "");
    PCIDSKRPCSegment *poRPCSeg = nullptr;

    while (poSeg != nullptr &&
           (poRPCSeg = dynamic_cast<PCIDSKRPCSegment *>(poSeg)) == nullptr)

    {
        poSeg = poFile->GetSegment(SEG_BIN, "", poSeg->GetSegmentNumber());
    }

    if (poRPCSeg == nullptr)
        return;

    /* -------------------------------------------------------------------- */
    /*      Turn RPC segment into GDAL RFC 22 style metadata.               */
    /* -------------------------------------------------------------------- */
    try
    {
        CPLString osValue;
        double dfLineOffset, dfLineScale, dfSampOffset, dfSampScale;
        double dfLatOffset, dfLatScale, dfLongOffset, dfLongScale,
            dfHeightOffset, dfHeightScale;

        poRPCSeg->GetRPCTranslationCoeffs(
            dfLongOffset, dfLongScale, dfLatOffset, dfLatScale, dfHeightOffset,
            dfHeightScale, dfSampOffset, dfSampScale, dfLineOffset,
            dfLineScale);

        osValue.Printf("%.16g", dfLineOffset);
        GDALPamDataset::SetMetadataItem("LINE_OFF", osValue, "RPC");

        osValue.Printf("%.16g", dfLineScale);
        GDALPamDataset::SetMetadataItem("LINE_SCALE", osValue, "RPC");

        osValue.Printf("%.16g", dfSampOffset);
        GDALPamDataset::SetMetadataItem("SAMP_OFF", osValue, "RPC");

        osValue.Printf("%.16g", dfSampScale);
        GDALPamDataset::SetMetadataItem("SAMP_SCALE", osValue, "RPC");

        osValue.Printf("%.16g", dfLongOffset);
        GDALPamDataset::SetMetadataItem("LONG_OFF", osValue, "RPC");

        osValue.Printf("%.16g", dfLongScale);
        GDALPamDataset::SetMetadataItem("LONG_SCALE", osValue, "RPC");

        osValue.Printf("%.16g", dfLatOffset);
        GDALPamDataset::SetMetadataItem("LAT_OFF", osValue, "RPC");

        osValue.Printf("%.16g", dfLatScale);
        GDALPamDataset::SetMetadataItem("LAT_SCALE", osValue, "RPC");

        osValue.Printf("%.16g", dfHeightOffset);
        GDALPamDataset::SetMetadataItem("HEIGHT_OFF", osValue, "RPC");

        osValue.Printf("%.16g", dfHeightScale);
        GDALPamDataset::SetMetadataItem("HEIGHT_SCALE", osValue, "RPC");

        if (poRPCSeg->GetXNumerator().size() != 20 ||
            poRPCSeg->GetXDenominator().size() != 20 ||
            poRPCSeg->GetYNumerator().size() != 20 ||
            poRPCSeg->GetYDenominator().size() != 20)
        {
            GDALPamDataset::SetMetadata(nullptr, "RPC");
            CPLError(CE_Failure, CPLE_AppDefined,
                     "Did not get 20 values in the RPC coefficients lists.");
            return;
        }

        std::vector<double> adfCoef = poRPCSeg->GetYNumerator();
        CPLString osCoefList = "";
        for (int i = 0; i < 20; i++)
        {
            osValue.Printf("%.16g ", adfCoef[i]);
            osCoefList += osValue;
        }
        GDALPamDataset::SetMetadataItem("LINE_NUM_COEFF", osCoefList, "RPC");

        adfCoef = poRPCSeg->GetYDenominator();
        osCoefList = "";
        for (int i = 0; i < 20; i++)
        {
            osValue.Printf("%.16g ", adfCoef[i]);
            osCoefList += osValue;
        }
        GDALPamDataset::SetMetadataItem("LINE_DEN_COEFF", osCoefList, "RPC");

        adfCoef = poRPCSeg->GetXNumerator();
        osCoefList = "";
        for (int i = 0; i < 20; i++)
        {
            osValue.Printf("%.16g ", adfCoef[i]);
            osCoefList += osValue;
        }
        GDALPamDataset::SetMetadataItem("SAMP_NUM_COEFF", osCoefList, "RPC");

        adfCoef = poRPCSeg->GetXDenominator();
        osCoefList = "";
        for (int i = 0; i < 20; i++)
        {
            osValue.Printf("%.16g ", adfCoef[i]);
            osCoefList += osValue;
        }
        GDALPamDataset::SetMetadataItem("SAMP_DEN_COEFF", osCoefList, "RPC");
    }
    catch (const PCIDSKException &ex)
    {
        GDALPamDataset::SetMetadata(nullptr, "RPC");
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
    }
}

/************************************************************************/
/*                             FlushCache()                             */
/************************************************************************/

CPLErr PCIDSK2Dataset::FlushCache(bool bAtClosing)

{
    CPLErr eErr = GDALPamDataset::FlushCache(bAtClosing);

    if (poFile)
    {
        try
        {
            poFile->Synchronize();
        }
        catch (const PCIDSKException &ex)
        {
            eErr = CE_Failure;
            CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        }
    }
    return eErr;
}

/************************************************************************/
/*                            SetMetadata()                             */
/************************************************************************/

CPLErr PCIDSK2Dataset::SetMetadata(char **papszMD, const char *pszDomain)

{
    /* -------------------------------------------------------------------- */
    /*      PCIDSK only supports metadata in the default domain.            */
    /* -------------------------------------------------------------------- */
    if (pszDomain != nullptr && strlen(pszDomain) > 0)
        return GDALPamDataset::SetMetadata(papszMD, pszDomain);

    /* -------------------------------------------------------------------- */
    /*      Set each item individually.                                     */
    /* -------------------------------------------------------------------- */
    CSLDestroy(papszLastMDListValue);
    papszLastMDListValue = nullptr;
    m_oCacheMetadataItem.clear();

    if (GetAccess() == GA_ReadOnly)
    {
        CPLError(CE_Failure, CPLE_NoWriteAccess,
                 "Unable to set metadata on read-only file.");
        return CE_Failure;
    }

    try
    {
        for (int iItem = 0; papszMD && papszMD[iItem]; iItem++)
        {
            char *pszItemName = nullptr;
            const char *pszItemValue =
                CPLParseNameValue(papszMD[iItem], &pszItemName);
            if (pszItemName != nullptr)
            {
                poFile->SetMetadataValue(pszItemName, pszItemValue);
                CPLFree(pszItemName);
            }
        }
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return CE_Failure;
    }

    return CE_None;
}

/************************************************************************/
/*                          SetMetadataItem()                           */
/************************************************************************/

CPLErr PCIDSK2Dataset::SetMetadataItem(const char *pszName,
                                       const char *pszValue,
                                       const char *pszDomain)

{
    /* -------------------------------------------------------------------- */
    /*      PCIDSK only supports metadata in the default domain.            */
    /* -------------------------------------------------------------------- */
    if (pszDomain != nullptr && strlen(pszDomain) > 0)
        return GDALPamDataset::SetMetadataItem(pszName, pszValue, pszDomain);

    /* -------------------------------------------------------------------- */
    /*      Set on the file.                                                */
    /* -------------------------------------------------------------------- */
    CSLDestroy(papszLastMDListValue);
    papszLastMDListValue = nullptr;
    m_oCacheMetadataItem.clear();

    if (GetAccess() == GA_ReadOnly)
    {
        CPLError(CE_Failure, CPLE_NoWriteAccess,
                 "Unable to set metadata on read-only file.");
        return CE_Failure;
    }

    try
    {
        poFile->SetMetadataValue(pszName, pszValue);
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return CE_Failure;
    }

    return CE_None;
}

/************************************************************************/
/*                      GetMetadataDomainList()                         */
/************************************************************************/

char **PCIDSK2Dataset::GetMetadataDomainList()
{
    return BuildMetadataDomainList(GDALPamDataset::GetMetadataDomainList(),
                                   TRUE, "", nullptr);
}

/************************************************************************/
/*                          GetMetadataItem()                           */
/************************************************************************/

const char *PCIDSK2Dataset::GetMetadataItem(const char *pszName,
                                            const char *pszDomain)

{
    /* -------------------------------------------------------------------- */
    /*      PCIDSK only supports metadata in the default domain.            */
    /* -------------------------------------------------------------------- */
    if (pszDomain != nullptr && strlen(pszDomain) > 0)
        return GDALPamDataset::GetMetadataItem(pszName, pszDomain);

    /* -------------------------------------------------------------------- */
    /*      Try and fetch (use cached value if available)                   */
    /* -------------------------------------------------------------------- */
    auto oIter = m_oCacheMetadataItem.find(pszName);
    if (oIter != m_oCacheMetadataItem.end())
    {
        return oIter->second.empty() ? nullptr : oIter->second.c_str();
    }

    CPLString osValue;
    try
    {
        osValue = poFile->GetMetadataValue(pszName);
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return nullptr;
    }

    oIter = m_oCacheMetadataItem
                .insert(std::pair<std::string, std::string>(pszName, osValue))
                .first;
    return oIter->second.empty() ? nullptr : oIter->second.c_str();
}

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

char **PCIDSK2Dataset::GetMetadata(const char *pszDomain)

{
    /* -------------------------------------------------------------------- */
    /*      PCIDSK only supports metadata in the default domain.            */
    /* -------------------------------------------------------------------- */
    if (pszDomain != nullptr && strlen(pszDomain) > 0)
        return GDALPamDataset::GetMetadata(pszDomain);

    /* -------------------------------------------------------------------- */
    /*      If we have a cached result, just use that.                      */
    /* -------------------------------------------------------------------- */
    if (papszLastMDListValue != nullptr)
        return papszLastMDListValue;

    /* -------------------------------------------------------------------- */
    /*      Fetch and build the list.                                       */
    /* -------------------------------------------------------------------- */
    try
    {
        std::vector<std::string> aosKeys = poFile->GetMetadataKeys();

        for (unsigned int i = 0; i < aosKeys.size(); i++)
        {
            if (aosKeys[i].c_str()[0] == '_')
                continue;

            papszLastMDListValue =
                CSLSetNameValue(papszLastMDListValue, aosKeys[i].c_str(),
                                poFile->GetMetadataValue(aosKeys[i]).c_str());
        }
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return nullptr;
    }

    return papszLastMDListValue;
}

/************************************************************************/
/*                          SetGeoTransform()                           */
/************************************************************************/

CPLErr PCIDSK2Dataset::SetGeoTransform(double *padfTransform)
{
    PCIDSKGeoref *poGeoref = nullptr;
    try
    {
        PCIDSKSegment *poGeoSeg = poFile->GetSegment(1);
        poGeoref = dynamic_cast<PCIDSKGeoref *>(poGeoSeg);
    }
    catch (const PCIDSKException &)
    {
        // I should really check whether this is an expected issue.
    }

    if (poGeoref == nullptr)
        return GDALPamDataset::SetGeoTransform(padfTransform);

    if (GetAccess() == GA_ReadOnly)
    {
        CPLError(CE_Failure, CPLE_NoWriteAccess,
                 "Unable to set GeoTransform on read-only file.");
        return CE_Failure;
    }

    try
    {
        poGeoref->WriteSimple(poGeoref->GetGeosys(), padfTransform[0],
                              padfTransform[1], padfTransform[2],
                              padfTransform[3], padfTransform[4],
                              padfTransform[5]);
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return CE_Failure;
    }

    return CE_None;
}

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

CPLErr PCIDSK2Dataset::GetGeoTransform(double *padfTransform)
{
    PCIDSKGeoref *poGeoref = nullptr;
    try
    {
        PCIDSKSegment *poGeoSeg = poFile->GetSegment(1);
        poGeoref = dynamic_cast<PCIDSKGeoref *>(poGeoSeg);
    }
    catch (const PCIDSKException &)
    {
        // I should really check whether this is an expected issue.
    }

    if (poGeoref != nullptr)
    {
        try
        {
            poGeoref->GetTransform(padfTransform[0], padfTransform[1],
                                   padfTransform[2], padfTransform[3],
                                   padfTransform[4], padfTransform[5]);
        }
        catch (const PCIDSKException &ex)
        {
            CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
            return CE_Failure;
        }

        // If we got anything non-default return it.
        if (padfTransform[0] != 0.0 || padfTransform[1] != 1.0 ||
            padfTransform[2] != 0.0 || padfTransform[3] != 0.0 ||
            padfTransform[4] != 0.0 || padfTransform[5] != 1.0)
            return CE_None;
    }

    /* -------------------------------------------------------------------- */
    /*      Check for worldfile if we have no other georeferencing.         */
    /* -------------------------------------------------------------------- */
    if (GDALReadWorldFile(GetDescription(), "pxw", padfTransform))
        return CE_None;

    return GDALPamDataset::GetGeoTransform(padfTransform);
}

/************************************************************************/
/*                           SetSpatialRef()                            */
/************************************************************************/

CPLErr PCIDSK2Dataset::SetSpatialRef(const OGRSpatialReference *poSRS)

{
    PCIDSKGeoref *poGeoref = nullptr;

    try
    {
        PCIDSKSegment *poGeoSeg = poFile->GetSegment(1);
        poGeoref = dynamic_cast<PCIDSKGeoref *>(poGeoSeg);
    }
    catch (const PCIDSKException &)
    {
        // I should really check whether this is an expected issue.
    }

    if (poGeoref == nullptr)
    {
        return GDALPamDataset::SetSpatialRef(poSRS);
    }

    char *pszGeosys = nullptr;
    char *pszUnits = nullptr;
    double *padfPrjParams = nullptr;

    if (poSRS == nullptr || poSRS->exportToPCI(&pszGeosys, &pszUnits,
                                               &padfPrjParams) != OGRERR_NONE)
    {
        return GDALPamDataset::SetSpatialRef(poSRS);
    }

    if (GetAccess() == GA_ReadOnly)
    {
        CPLError(CE_Failure, CPLE_NoWriteAccess,
                 "Unable to set projection on read-only file.");
        CPLFree(pszGeosys);
        CPLFree(pszUnits);
        CPLFree(padfPrjParams);
        return CE_Failure;
    }

    try
    {
        double adfGT[6];
        poGeoref->GetTransform(adfGT[0], adfGT[1], adfGT[2], adfGT[3], adfGT[4],
                               adfGT[5]);

        poGeoref->WriteSimple(pszGeosys, adfGT[0], adfGT[1], adfGT[2], adfGT[3],
                              adfGT[4], adfGT[5]);

        std::vector<double> adfPCIParameters;
        for (unsigned int i = 0; i < 17; i++)
            adfPCIParameters.push_back(padfPrjParams[i]);

        if (STARTS_WITH_CI(pszUnits, "FOOT"))
            adfPCIParameters.push_back(
                static_cast<double>(static_cast<int>(PCIDSK::UNIT_US_FOOT)));
        else if (EQUALN(pszUnits, "INTL FOOT", 9))
            adfPCIParameters.push_back(
                static_cast<double>(static_cast<int>(PCIDSK::UNIT_INTL_FOOT)));
        else if (EQUALN(pszUnits, "DEGREE", 6))
            adfPCIParameters.push_back(
                static_cast<double>(static_cast<int>(PCIDSK::UNIT_DEGREE)));
        else
            adfPCIParameters.push_back(
                static_cast<double>(static_cast<int>(PCIDSK::UNIT_METER)));

        poGeoref->WriteParameters(adfPCIParameters);
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return CE_Failure;
    }

    CPLFree(pszGeosys);
    CPLFree(pszUnits);
    CPLFree(padfPrjParams);

    return CE_None;
}

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

const OGRSpatialReference *PCIDSK2Dataset::GetSpatialRef() const
{
    if (m_poSRS)
        return m_poSRS;

    PCIDSKGeoref *poGeoref = nullptr;

    try
    {
        PCIDSKSegment *poGeoSeg = poFile->GetSegment(1);
        poGeoref = dynamic_cast<PCIDSKGeoref *>(poGeoSeg);
    }
    catch (const PCIDSKException &)
    {
        // I should really check whether this is an expected issue.
    }

    if (poGeoref == nullptr)
    {
        return GDALPamDataset::GetSpatialRef();
    }

    CPLString osGeosys;
    const char *pszUnits = nullptr;

    std::vector<double> adfParameters;
    adfParameters.resize(18);

    try
    {
        osGeosys = poGeoref->GetGeosys();
        adfParameters = poGeoref->GetParameters();
        const UnitCode code =
            static_cast<UnitCode>(static_cast<int>(adfParameters[16]));

        if (code == PCIDSK::UNIT_DEGREE)
            pszUnits = "DEGREE";
        else if (code == PCIDSK::UNIT_METER)
            pszUnits = "METER";
        else if (code == PCIDSK::UNIT_US_FOOT)
            pszUnits = "FOOT";
        else if (code == PCIDSK::UNIT_INTL_FOOT)
            pszUnits = "INTL FOOT";
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
    }

    OGRSpatialReference oSRS;
    oSRS.SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
    if (oSRS.importFromPCI(osGeosys, pszUnits, &(adfParameters[0])) ==
        OGRERR_NONE)
    {
        m_poSRS = oSRS.Clone();
        return m_poSRS;
    }
    else
    {
        return GDALPamDataset::GetSpatialRef();
    }
}

/************************************************************************/
/*                          IBuildOverviews()                           */
/************************************************************************/

CPLErr PCIDSK2Dataset::IBuildOverviews(
    const char *pszResampling, int nOverviews, const int *panOverviewList,
    int nListBands, const int *panBandList, GDALProgressFunc pfnProgress,
    void *pProgressData, CSLConstList papszOptions)

{
    PCIDSK2Band *poBand =
        reinterpret_cast<PCIDSK2Band *>(GetRasterBand(panBandList[0]));

    /* -------------------------------------------------------------------- */
    /*      If RRD overviews requested, then invoke generic handling.       */
    /* -------------------------------------------------------------------- */
    bool bUseGenericHandling = false;

    if (CPLTestBool(CPLGetConfigOption("USE_RRD", "NO")))
    {
        bUseGenericHandling = true;
    }

    /* -------------------------------------------------------------------- */
    /*      If we don't have read access, then create the overviews         */
    /*      externally.                                                     */
    /* -------------------------------------------------------------------- */
    if (GetAccess() != GA_Update)
    {
        CPLDebug("PCIDSK", "File open for read-only accessing, "
                           "creating overviews externally.");

        bUseGenericHandling = true;
    }

    if (bUseGenericHandling)
    {
        if (poBand->GetOverviewCount() != 0)
        {
            CPLError(CE_Failure, CPLE_NotSupported,
                     "Cannot add external overviews when there are already "
                     "internal overviews");
            return CE_Failure;
        }

        return GDALDataset::IBuildOverviews(
            pszResampling, nOverviews, panOverviewList, nListBands, panBandList,
            pfnProgress, pProgressData, papszOptions);
    }

    if (nListBands == 0)
        return CE_None;

    /* -------------------------------------------------------------------- */
    /*      Currently no support for clearing overviews.                    */
    /* -------------------------------------------------------------------- */
    if (nOverviews == 0)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "PCIDSK2 driver does not currently support clearing existing "
                 "overviews. ");
        return CE_Failure;
    }

    /* -------------------------------------------------------------------- */
    /*      Establish which of the overview levels we already have, and     */
    /*      which are new.  We assume that band 1 of the file is            */
    /*      representative.                                                 */
    /* -------------------------------------------------------------------- */

    int nNewOverviews = 0;
    int *panNewOverviewList =
        reinterpret_cast<int *>(CPLCalloc(sizeof(int), nOverviews));
    std::vector<bool> abFoundOverviewFactor(nOverviews);
    for (int i = 0; i < nOverviews && poBand != nullptr; i++)
    {
        for (int j = 0; j < poBand->GetOverviewCount(); j++)
        {
            GDALRasterBand *poOverview = poBand->GetOverview(j);

            int nOvFactor =
                GDALComputeOvFactor(poOverview->GetXSize(), poBand->GetXSize(),
                                    poOverview->GetYSize(), poBand->GetYSize());

            if (nOvFactor == panOverviewList[i] ||
                nOvFactor == GDALOvLevelAdjust2(panOverviewList[i],
                                                poBand->GetXSize(),
                                                poBand->GetYSize()))
                abFoundOverviewFactor[i] = true;
        }

        if (!abFoundOverviewFactor[i])
            panNewOverviewList[nNewOverviews++] = panOverviewList[i];
    }

    /* -------------------------------------------------------------------- */
    /*      Create the overviews that are missing.                          */
    /* -------------------------------------------------------------------- */
    for (int i = 0; i < nNewOverviews; i++)
    {
        try
        {
            // conveniently our resampling values mostly match PCIDSK.
            poFile->CreateOverviews(nListBands, panBandList,
                                    panNewOverviewList[i], pszResampling);
        }
        catch (const PCIDSKException &ex)
        {
            CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
            CPLFree(panNewOverviewList);
            return CE_Failure;
        }
    }

    CPLFree(panNewOverviewList);
    panNewOverviewList = nullptr;

    for (int iBand = 0; iBand < nListBands; iBand++)
    {
        poBand =
            reinterpret_cast<PCIDSK2Band *>(GetRasterBand(panBandList[iBand]));
        reinterpret_cast<PCIDSK2Band *>(poBand)->RefreshOverviewList();
    }

    /* -------------------------------------------------------------------- */
    /*      Actually generate the overview imagery.                         */
    /* -------------------------------------------------------------------- */
    CPLErr eErr = CE_None;
    std::vector<int> anRegenLevels;

    GDALRasterBand **papoOverviewBands = reinterpret_cast<GDALRasterBand **>(
        CPLCalloc(sizeof(void *), nOverviews));

    for (int iBand = 0; iBand < nListBands && eErr == CE_None; iBand++)
    {
        nNewOverviews = 0;

        poBand =
            reinterpret_cast<PCIDSK2Band *>(GetRasterBand(panBandList[iBand]));

        for (int i = 0; i < nOverviews && poBand != nullptr; i++)
        {
            for (int j = 0; j < poBand->GetOverviewCount(); j++)
            {
                GDALRasterBand *poOverview = poBand->GetOverview(j);

                int nOvFactor = GDALComputeOvFactor(
                    poOverview->GetXSize(), poBand->GetXSize(),
                    poOverview->GetYSize(), poBand->GetYSize());

                if (nOvFactor == panOverviewList[i] ||
                    nOvFactor == GDALOvLevelAdjust2(panOverviewList[i],
                                                    poBand->GetXSize(),
                                                    poBand->GetYSize()))
                {
                    papoOverviewBands[nNewOverviews++] = poOverview;
                    anRegenLevels.push_back(j);
                    break;
                }
            }
        }

        if (nNewOverviews > 0)
        {
            eErr = GDALRegenerateOverviewsEx(
                (GDALRasterBandH)poBand, nNewOverviews,
                reinterpret_cast<GDALRasterBandH *>(papoOverviewBands),
                pszResampling, pfnProgress, pProgressData, papszOptions);

            // Mark the regenerated overviews as valid.
            for (int i = 0; i < static_cast<int>(anRegenLevels.size()); i++)
                poBand->poChannel->SetOverviewValidity(anRegenLevels[i], true);
        }
    }

    CPLFree(papoOverviewBands);

    return eErr;
}

/************************************************************************/
/*                         PCIDSKTypeToGDAL()                           */
/************************************************************************/

GDALDataType PCIDSK2Dataset::PCIDSKTypeToGDAL(eChanType eType)
{
    switch (eType)
    {
        case CHN_8U:
            return GDT_Byte;

        case CHN_16U:
            return GDT_UInt16;

        case CHN_16S:
            return GDT_Int16;

        case CHN_32R:
            return GDT_Float32;

        case CHN_BIT:
            return GDT_Byte;

        case CHN_C16U:
            return GDT_CInt16;

        case CHN_C16S:
            return GDT_CInt16;

        case CHN_C32R:
            return GDT_CFloat32;

        default:
            return GDT_Unknown;
    }
}

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

GDALDataset *PCIDSK2Dataset::Open(GDALOpenInfo *poOpenInfo)
{
    if (!PCIDSKDriverIdentify(poOpenInfo))
        return nullptr;

    /* -------------------------------------------------------------------- */
    /*      Try opening the file.                                           */
    /* -------------------------------------------------------------------- */
    PCIDSKFile *poFile = nullptr;
    const int nMaxBandCount =
        atoi(CPLGetConfigOption("GDAL_MAX_BAND_COUNT", "65536"));
    try
    {
        poFile = PCIDSK::Open(poOpenInfo->pszFilename,
                              poOpenInfo->eAccess == GA_ReadOnly ? "r" : "r+",
                              PCIDSK2GetInterfaces(), nMaxBandCount);
        if (poFile == nullptr)
        {
            CPLError(CE_Failure, CPLE_OpenFailed,
                     "Failed to re-open %s within PCIDSK driver.\n",
                     poOpenInfo->pszFilename);
            return nullptr;
        }

        const bool bValidRasterDimensions =
            poFile->GetWidth() && poFile->GetHeight();
        if (!bValidRasterDimensions &&
            (poOpenInfo->nOpenFlags & GDAL_OF_RASTER) != 0 &&
            (poOpenInfo->nOpenFlags & GDAL_OF_VECTOR) == 0)
        {
            delete poFile;
            return nullptr;
        }

        /* Check if this is a vector-only PCIDSK file and that we are */
        /* opened in raster-only mode */
        if (poOpenInfo->eAccess == GA_ReadOnly &&
            (poOpenInfo->nOpenFlags & GDAL_OF_RASTER) != 0 &&
            (poOpenInfo->nOpenFlags & GDAL_OF_VECTOR) == 0 &&
            poFile->GetChannels() == 0 &&
            poFile->GetSegment(PCIDSK::SEG_VEC, "") != nullptr)
        {
            CPLDebug("PCIDSK",
                     "This is a vector-only PCIDSK dataset, "
                     "but it has been opened in read-only in raster-only mode");
            delete poFile;
            return nullptr;
        }
        /* Reverse test */
        if (poOpenInfo->eAccess == GA_ReadOnly &&
            (poOpenInfo->nOpenFlags & GDAL_OF_RASTER) == 0 &&
            (poOpenInfo->nOpenFlags & GDAL_OF_VECTOR) != 0 &&
            poFile->GetChannels() != 0 &&
            poFile->GetSegment(PCIDSK::SEG_VEC, "") == nullptr)
        {
            CPLDebug("PCIDSK",
                     "This is a raster-only PCIDSK dataset, "
                     "but it has been opened in read-only in vector-only mode");
            delete poFile;
            return nullptr;
        }

        return LLOpen(poOpenInfo->pszFilename, poFile, poOpenInfo->eAccess,
                      poOpenInfo->GetSiblingFiles());
    }
    /* -------------------------------------------------------------------- */
    /*      Trap exceptions.                                                */
    /* -------------------------------------------------------------------- */
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        delete poFile;
        return nullptr;
    }
    catch (...)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "PCIDSK::Create() failed, unexpected exception.");
        delete poFile;
        return nullptr;
    }
}

/************************************************************************/
/*                               LLOpen()                               */
/*                                                                      */
/*      Low level variant of open that takes the preexisting            */
/*      PCIDSKFile.                                                     */
/************************************************************************/

GDALDataset *PCIDSK2Dataset::LLOpen(const char *pszFilename,
                                    PCIDSK::PCIDSKFile *poFile,
                                    GDALAccess eAccessIn,
                                    char **papszSiblingFiles)

{
    PCIDSK2Dataset *poDS = new PCIDSK2Dataset();
    /* -------------------------------------------------------------------- */
    /*      Create a corresponding GDALDataset.                             */
    /* -------------------------------------------------------------------- */
    poDS->poFile = poFile;
    poDS->eAccess = eAccessIn;
    poDS->nRasterXSize = poFile->GetWidth();
    poDS->nRasterYSize = poFile->GetHeight();

    const bool bValidRasterDimensions =
        poFile->GetWidth() && poFile->GetHeight();
    if (!bValidRasterDimensions)
    {
        poDS->nRasterXSize = 512;
        poDS->nRasterYSize = 512;
    }

    try
    {

        /* --------------------------------------------------------------------
         */
        /*      Are we specifically PIXEL or BAND interleaving? */
        /*                                                                      */
        /*      We don't set anything for FILE since it is harder to know if */
        /*      this is tiled or what the on disk interleaving is. */
        /* --------------------------------------------------------------------
         */
        if (EQUAL(poFile->GetInterleaving().c_str(), "PIXEL"))
            poDS->SetMetadataItem("IMAGE_STRUCTURE", "PIXEL",
                                  "IMAGE_STRUCTURE");
        else if (EQUAL(poFile->GetInterleaving().c_str(), "BAND"))
            poDS->SetMetadataItem("IMAGE_STRUCTURE", "BAND", "IMAGE_STRUCTURE");

        /* --------------------------------------------------------------------
         */
        /*      Create band objects. */
        /* --------------------------------------------------------------------
         */
        for (int iBand = 0;
             bValidRasterDimensions && iBand < poFile->GetChannels(); iBand++)
        {
            PCIDSKChannel *poChannel = poFile->GetChannel(iBand + 1);
            if (poChannel->GetBlockWidth() <= 0 ||
                poChannel->GetBlockHeight() <= 0)
            {
                delete poDS;
                return nullptr;
            }

            if (PCIDSK2Dataset::PCIDSKTypeToGDAL(poChannel->GetType()) ==
                GDT_Unknown)
            {
                continue;
            }

            poDS->SetBand(poDS->GetRasterCount() + 1,
                          new PCIDSK2Band(poFile, poChannel));
        }

        /* --------------------------------------------------------------------
         */
        /*      Create band objects for bitmap segments. */
        /* --------------------------------------------------------------------
         */
        int nLastBitmapSegment = 0;
        PCIDSKSegment *poBitSeg = nullptr;

        while (bValidRasterDimensions &&
               (poBitSeg = poFile->GetSegment(SEG_BIT, "",
                                              nLastBitmapSegment)) != nullptr)
        {
            PCIDSKChannel *poChannel = dynamic_cast<PCIDSKChannel *>(poBitSeg);
            if (poChannel == nullptr || poChannel->GetBlockWidth() <= 0 ||
                poChannel->GetBlockHeight() <= 0)
            {
                delete poDS;
                return nullptr;
            }

            if (PCIDSK2Dataset::PCIDSKTypeToGDAL(poChannel->GetType()) ==
                GDT_Unknown)
            {
                continue;
            }

            poDS->SetBand(poDS->GetRasterCount() + 1,
                          new PCIDSK2Band(poChannel));

            nLastBitmapSegment = poBitSeg->GetSegmentNumber();
        }

        /* --------------------------------------------------------------------
         */
        /*      Create vector layers from vector segments. */
        /* --------------------------------------------------------------------
         */
        PCIDSK::PCIDSKSegment *segobj = poFile->GetSegment(PCIDSK::SEG_VEC, "");
        for (; segobj != nullptr;
             segobj = poFile->GetSegment(PCIDSK::SEG_VEC, "",
                                         segobj->GetSegmentNumber()))
        {
            PCIDSK::PCIDSKVectorSegment *poVecSeg =
                dynamic_cast<PCIDSK::PCIDSKVectorSegment *>(segobj);
            if (poVecSeg)
                poDS->apoLayers.push_back(new OGRPCIDSKLayer(
                    poDS, segobj, poVecSeg, eAccessIn == GA_Update));
        }

        /* --------------------------------------------------------------------
         */
        /*      Process RPC segment, if there is one. */
        /* --------------------------------------------------------------------
         */
        poDS->ProcessRPC();

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

        /* --------------------------------------------------------------------
         */
        /*      Open overviews. */
        /* --------------------------------------------------------------------
         */
        poDS->oOvManager.Initialize(poDS, pszFilename, papszSiblingFiles);

        return poDS;
    }

    /* -------------------------------------------------------------------- */
    /*      Trap exceptions.                                                */
    /* -------------------------------------------------------------------- */
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
    }
    catch (...)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "PCIDSK SDK Failure in Open(), unexpected exception.");
    }

    /* -------------------------------------------------------------------- */
    /*      In case of exception, close dataset                             */
    /* -------------------------------------------------------------------- */
    delete poDS;

    return nullptr;
}

/************************************************************************/
/*                               Create()                               */
/************************************************************************/

GDALDataset *PCIDSK2Dataset::Create(const char *pszFilename, int nXSize,
                                    int nYSize, int nBandsIn,
                                    GDALDataType eType, char **papszParamList)

{
    /* -------------------------------------------------------------------- */
    /*      Prepare channel type list.                                      */
    /* -------------------------------------------------------------------- */
    std::vector<eChanType> aeChanTypes;

    if (eType == GDT_Float32)
        aeChanTypes.resize(std::max(1, nBandsIn), CHN_32R);
    else if (eType == GDT_Int16)
        aeChanTypes.resize(std::max(1, nBandsIn), CHN_16S);
    else if (eType == GDT_UInt16)
        aeChanTypes.resize(std::max(1, nBandsIn), CHN_16U);
    else if (eType == GDT_CInt16)
        aeChanTypes.resize(std::max(1, nBandsIn), CHN_C16S);
    else if (eType == GDT_CFloat32)
        aeChanTypes.resize(std::max(1, nBandsIn), CHN_C32R);
    else
        aeChanTypes.resize(std::max(1, nBandsIn), CHN_8U);

    /* -------------------------------------------------------------------- */
    /*      Reformat options.  Currently no support for jpeg compression    */
    /*      quality.                                                        */
    /* -------------------------------------------------------------------- */
    CPLString osOptions;
    const char *pszValue = CSLFetchNameValue(papszParamList, "INTERLEAVING");
    if (pszValue == nullptr)
        pszValue = "BAND";

    osOptions = pszValue;

    if (osOptions == "TILED")
    {
        pszValue = CSLFetchNameValue(papszParamList, "TILESIZE");
        if (pszValue != nullptr)
            osOptions += pszValue;

        pszValue = CSLFetchNameValue(papszParamList, "COMPRESSION");
        if (pszValue != nullptr)
        {
            osOptions += " ";
            osOptions += pszValue;
        }

        pszValue = CSLFetchNameValue(papszParamList, "TILEVERSION");
        if (pszValue != nullptr)
        {
            osOptions += " TILEV";
            osOptions += pszValue;
        }
    }

    /* -------------------------------------------------------------------- */
    /*      Try creation.                                                   */
    /* -------------------------------------------------------------------- */

    try
    {
        if (nBandsIn == 0)
        {
            nXSize = 512;
            nYSize = 512;
        }
        PCIDSKFile *poFile = PCIDSK::Create(pszFilename, nXSize, nYSize,
                                            nBandsIn, &(aeChanTypes[0]),
                                            osOptions, PCIDSK2GetInterfaces());

        /* --------------------------------------------------------------------
         */
        /*      Apply band descriptions, if provided as creation options. */
        /* --------------------------------------------------------------------
         */
        for (size_t i = 0;
             papszParamList != nullptr && papszParamList[i] != nullptr; i++)
        {
            if (STARTS_WITH_CI(papszParamList[i], "BANDDESC"))
            {
                int nBand = atoi(papszParamList[i] + 8);
                const char *pszDescription = strstr(papszParamList[i], "=");
                if (pszDescription && nBand > 0 && nBand <= nBandsIn)
                {
                    poFile->GetChannel(nBand)->SetDescription(pszDescription +
                                                              1);
                }
            }
        }

        return LLOpen(pszFilename, poFile, GA_Update);
    }
    /* -------------------------------------------------------------------- */
    /*      Trap exceptions.                                                */
    /* -------------------------------------------------------------------- */
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
    }
    catch (...)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "PCIDSK::Create() failed, unexpected exception.");
    }

    return nullptr;
}

/************************************************************************/
/*                           TestCapability()                           */
/************************************************************************/

int PCIDSK2Dataset::TestCapability(const char *pszCap)

{
    if (EQUAL(pszCap, ODsCCreateLayer))
        return eAccess == GA_Update;
    if (EQUAL(pszCap, ODsCRandomLayerWrite))
        return eAccess == GA_Update;
    if (EQUAL(pszCap, ODsCZGeometries))
        return TRUE;

    return FALSE;
}

/************************************************************************/
/*                              GetLayer()                              */
/************************************************************************/

OGRLayer *PCIDSK2Dataset::GetLayer(int iLayer)

{
    if (iLayer < 0 || iLayer >= static_cast<int>(apoLayers.size()))
        return nullptr;

    return apoLayers[iLayer];
}

/************************************************************************/
/*                           ICreateLayer()                             */
/************************************************************************/

OGRLayer *PCIDSK2Dataset::ICreateLayer(const char *pszLayerName,
                                       const OGRGeomFieldDefn *poGeomFieldDefn,
                                       CSLConstList /*papszOptions*/)
{
    /* -------------------------------------------------------------------- */
    /*      Verify we are in update mode.                                   */
    /* -------------------------------------------------------------------- */
    if (eAccess != GA_Update)
    {
        CPLError(CE_Failure, CPLE_NoWriteAccess,
                 "Data source %s opened read-only.\n"
                 "New layer %s cannot be created.\n",
                 GetDescription(), pszLayerName);
        return nullptr;
    }

    const auto eType = poGeomFieldDefn ? poGeomFieldDefn->GetType() : wkbNone;
    const auto poSRS =
        poGeomFieldDefn ? poGeomFieldDefn->GetSpatialRef() : nullptr;

    /* -------------------------------------------------------------------- */
    /*      Figure out what type of layer we need.                          */
    /* -------------------------------------------------------------------- */
    std::string osLayerType;

    switch (wkbFlatten(eType))
    {
        case wkbPoint:
            osLayerType = "POINTS";
            break;

        case wkbLineString:
            osLayerType = "ARCS";
            break;

        case wkbPolygon:
            osLayerType = "WHOLE_POLYGONS";
            break;

        case wkbNone:
            osLayerType = "TABLE";
            break;

        default:
            break;
    }

    /* -------------------------------------------------------------------- */
    /*      Create the segment.                                             */
    /* -------------------------------------------------------------------- */
    int nSegNum;
    try
    {
        nSegNum = poFile->CreateSegment(pszLayerName, "", PCIDSK::SEG_VEC, 0L);
    }
    catch (const PCIDSKException &ex)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        return nullptr;
    }
    PCIDSK::PCIDSKSegment *poSeg = poFile->GetSegment(nSegNum);
    PCIDSK::PCIDSKVectorSegment *poVecSeg =
        dynamic_cast<PCIDSK::PCIDSKVectorSegment *>(poSeg);
    if (poVecSeg == nullptr)
        return nullptr;

    if (osLayerType != "")
        poSeg->SetMetadataValue("LAYER_TYPE", osLayerType);

    /* -------------------------------------------------------------------- */
    /*      Do we need to apply a coordinate system?                        */
    /* -------------------------------------------------------------------- */
    char *pszGeosys = nullptr;
    char *pszUnits = nullptr;
    double *padfPrjParams = nullptr;

    if (poSRS != nullptr && poSRS->exportToPCI(&pszGeosys, &pszUnits,
                                               &padfPrjParams) == OGRERR_NONE)
    {
        try
        {
            std::vector<double> adfPCIParameters;

            for (int i = 0; i < 17; i++)
                adfPCIParameters.push_back(padfPrjParams[i]);

            if (STARTS_WITH_CI(pszUnits, "FOOT"))
                adfPCIParameters.push_back(static_cast<double>(
                    static_cast<int>(PCIDSK::UNIT_US_FOOT)));
            else if (STARTS_WITH_CI(pszUnits, "INTL FOOT"))
                adfPCIParameters.push_back(static_cast<double>(
                    static_cast<int>(PCIDSK::UNIT_INTL_FOOT)));
            else if (STARTS_WITH_CI(pszUnits, "DEGREE"))
                adfPCIParameters.push_back(
                    static_cast<double>(static_cast<int>(PCIDSK::UNIT_DEGREE)));
            else
                adfPCIParameters.push_back(
                    static_cast<double>(static_cast<int>(PCIDSK::UNIT_METER)));

            poVecSeg->SetProjection(pszGeosys, adfPCIParameters);
        }
        catch (const PCIDSKException &ex)
        {
            CPLError(CE_Failure, CPLE_AppDefined, "%s", ex.what());
        }

        CPLFree(pszGeosys);
        CPLFree(pszUnits);
        CPLFree(padfPrjParams);
    }

    /* -------------------------------------------------------------------- */
    /*      Create the layer object.                                        */
    /* -------------------------------------------------------------------- */

    apoLayers.push_back(new OGRPCIDSKLayer(this, poSeg, poVecSeg, TRUE));

    return apoLayers.back();
}

/************************************************************************/
/*                        GDALRegister_PCIDSK()                         */
/************************************************************************/

void GDALRegister_PCIDSK()

{
    if (GDALGetDriverByName(DRIVER_NAME) != nullptr)
        return;

    GDALDriver *poDriver = new GDALDriver();
    PCIDSKDriverSetCommonMetadata(poDriver);

    poDriver->pfnOpen = PCIDSK2Dataset::Open;
    poDriver->pfnCreate = PCIDSK2Dataset::Create;

    GetGDALDriverManager()->RegisterDriver(poDriver);
}
