/******************************************************************************
 *
 * Project:  JPEG-2000
 * Purpose:  Implementation of the ISO/IEC 15444-1 standard based on Kakadu.
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *
 ******************************************************************************
 * Copyright (c) 2002, Frank Warmerdam <warmerdam@pobox.com>
 * Copyright (c) 2007-2013, Even Rouault <even dot rouault at mines-paris dot org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#ifdef DEBUG_BOOL
#define DO_NOT_USE_DEBUG_BOOL
#endif

#include "cpl_port.h"
#include "jp2kakdataset.h"

#include "cpl_multiproc.h"
#include "cpl_string.h"
#include "gdal_frmts.h"
#include "gdaljp2abstractdataset.h"
#include "gdaljp2metadata.h"

#include "../mem/memdataset.h"

#include "jp2kak_headers.h"

#include "subfile_source.h"
#include "vsil_target.h"

#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <vector>

CPL_CVSID("$Id: jp2kakdataset.cpp 043ba13bd9b86aff795e0e3efc3dd3a109520bc4 2018-05-06 19:31:13 +0200 Even Rouault $")

// Before v7.5 Kakadu does not advertise its version well
// After v7.5 Kakadu has KDU_{MAJOR,MINOR,PATCH}_VERSION defines so it is easier
// For older releases compile with them manually specified
#ifndef KDU_MAJOR_VERSION
#  error Compile with eg. -DKDU_MAJOR_VERSION=7 -DKDU_MINOR_VERSION=3 -DKDU_PATCH_VERSION=2 to specify Kakadu library version
#endif

#if KDU_MAJOR_VERSION > 7 || (KDU_MAJOR_VERSION == 7 && KDU_MINOR_VERSION >= 5)
    using namespace kdu_core;
    using namespace kdu_supp;
#endif

// #define KAKADU_JPX 1

static bool kakadu_initialized = false;

constexpr unsigned char jp2_header[] =
    {0x00, 0x00, 0x00, 0x0c, 0x6a, 0x50, 0x20, 0x20, 0x0d, 0x0a, 0x87, 0x0a};

constexpr unsigned char jpc_header[] = {0xff, 0x4f};

/* -------------------------------------------------------------------- */
/*      The number of tiles at a time we will push through the          */
/*      encoder per flush when writing jpeg2000 streams.                */
/* -------------------------------------------------------------------- */
constexpr int TILE_CHUNK_SIZE = 1024;

/************************************************************************/
/* ==================================================================== */
/*                            JP2KAKRasterBand                          */
/* ==================================================================== */
/************************************************************************/

/************************************************************************/
/*                           JP2KAKRasterBand()                         */
/************************************************************************/

JP2KAKRasterBand::JP2KAKRasterBand( int nBandIn, int nDiscardLevelsIn,
                                    kdu_codestream oCodeStreamIn,
                                    int nResCount, kdu_client *jpip_clientIn,
                                    jp2_channels oJP2Channels,
                                    JP2KAKDataset *poBaseDSIn ) :
    poBaseDS(poBaseDSIn),
    nDiscardLevels(nDiscardLevelsIn),
    nOverviewCount(0),
    papoOverviewBand(nullptr),
    jpip_client(jpip_clientIn),
    oCodeStream(oCodeStreamIn),
    eInterp(GCI_Undefined)
{
    nBand = nBandIn;  // From GDALRasterBand.

    if( oCodeStream.get_bit_depth(nBand - 1) > 8 &&
        oCodeStream.get_bit_depth(nBand - 1) <= 16 &&
        oCodeStream.get_signed(nBand - 1) )
        eDataType = GDT_Int16;
    else if( oCodeStream.get_bit_depth(nBand - 1) > 8 &&
             oCodeStream.get_bit_depth(nBand - 1) <= 16 &&
             !oCodeStream.get_signed(nBand - 1) )
        eDataType = GDT_UInt16;
    else
        eDataType = GDT_Byte;

    oCodeStream.apply_input_restrictions(0, 0, nDiscardLevels, 0, nullptr);
    oCodeStream.get_dims(0, band_dims);

    nRasterXSize = band_dims.size.x;
    nRasterYSize = band_dims.size.y;

    // Capture some useful metadata.
    if( oCodeStream.get_bit_depth(nBand - 1) % 8 != 0 &&
        !poBaseDSIn->bPromoteTo8Bit )
    {
        SetMetadataItem(
            "NBITS",
            CPLString().Printf("%d", oCodeStream.get_bit_depth(nBand - 1)),
            "IMAGE_STRUCTURE");
    }
    SetMetadataItem("COMPRESSION", "JP2000", "IMAGE_STRUCTURE");

    // Use tile dimension as block size, unless it is too big
    kdu_dims valid_tiles;
    kdu_dims tile_dims;
    oCodeStream.get_valid_tiles(valid_tiles);
    oCodeStream.get_tile_dims(valid_tiles.pos, -1, tile_dims);
    nBlockXSize = std::min(std::min(tile_dims.size.x, 2048), nRasterXSize);
    nBlockYSize = std::min(std::min(tile_dims.size.y, 2048), nRasterYSize);
    CPLDebug( "JP2KAK", "JP2KAKRasterBand::JP2KAKRasterBand() : "
            "Tile dimension : %d X %d\n",
            nBlockXSize, nBlockYSize);

    // Figure out the color interpretation for this band.
    eInterp = GCI_Undefined;

    if( oJP2Channels.exists() )
    {
        int nRedIndex = -1;
        int nGreenIndex = -1;
        int nBlueIndex = -1;
        int nLutIndex = 0;
        int nCSI = 0;

#if KDU_MAJOR_VERSION > 7 || (KDU_MAJOR_VERSION == 7 && KDU_MINOR_VERSION >= 8)
        int nFMT = 0;
        if( oJP2Channels.get_num_colours() == 3 )
        {
            oJP2Channels.get_colour_mapping(0, nRedIndex, nLutIndex, nCSI,
                                            nFMT);
            oJP2Channels.get_colour_mapping(1, nGreenIndex, nLutIndex, nCSI,
                                            nFMT);
            oJP2Channels.get_colour_mapping(2, nBlueIndex, nLutIndex, nCSI,
                                            nFMT);
        }
        else
        {
            oJP2Channels.get_colour_mapping(0, nRedIndex, nLutIndex, nCSI,
                                            nFMT);
            if( nBand == 1 )
                eInterp = GCI_GrayIndex;
        }
#else
        if( oJP2Channels.get_num_colours() == 3 )
        {
            oJP2Channels.get_colour_mapping(0, nRedIndex, nLutIndex, nCSI);
            oJP2Channels.get_colour_mapping(1, nGreenIndex, nLutIndex, nCSI);
            oJP2Channels.get_colour_mapping(2, nBlueIndex, nLutIndex, nCSI);
        }
        else
        {
            oJP2Channels.get_colour_mapping(0, nRedIndex, nLutIndex, nCSI);
            if( nBand == 1 )
                eInterp = GCI_GrayIndex;
        }
#endif

        if( eInterp != GCI_Undefined )
            /* nothing to do */;
        // If we have LUT info, it is a palette image.
        else if( nLutIndex != -1 )
            eInterp = GCI_PaletteIndex;
        // Establish color band this is.
        else if( nRedIndex == nBand - 1 )
            eInterp = GCI_RedBand;
        else if( nGreenIndex == nBand - 1 )
            eInterp = GCI_GreenBand;
        else if( nBlueIndex == nBand - 1 )
            eInterp = GCI_BlueBand;
        else
            eInterp = GCI_Undefined;

        // Could this band be an alpha band?
        if( eInterp == GCI_Undefined )
        {
            for( int color_idx = 0;
                 color_idx < oJP2Channels.get_num_colours(); color_idx++ )
            {
                int opacity_idx = 0;
                int lut_idx = 0;

                // get_opacity_mapping sets that last 3 args by non-const refs.
#if KDU_MAJOR_VERSION > 7 || (KDU_MAJOR_VERSION == 7 && KDU_MINOR_VERSION >= 8)
                if(oJP2Channels.get_opacity_mapping(color_idx, opacity_idx,
                                                    lut_idx, nCSI, nFMT))
#else
                if(oJP2Channels.get_opacity_mapping(color_idx, opacity_idx,
                                                    lut_idx, nCSI))
#endif
                {
                    if( opacity_idx == nBand - 1 )
                        eInterp = GCI_AlphaBand;
                }
#if KDU_MAJOR_VERSION > 7 || (KDU_MAJOR_VERSION == 7 && KDU_MINOR_VERSION >= 8)
                if( oJP2Channels.get_premult_mapping(color_idx, opacity_idx,
                                                     lut_idx, nCSI, nFMT) )
#else
                if( oJP2Channels.get_premult_mapping(color_idx, opacity_idx,
                                                     lut_idx, nCSI) )
#endif
                {
                    if( opacity_idx == nBand - 1 )
                        eInterp = GCI_AlphaBand;
                }
            }
        }
    }
    else if( nBand == 1 )
    {
        eInterp = GCI_RedBand;
    }
    else if( nBand == 2 )
    {
        eInterp = GCI_GreenBand;
    }
    else if( nBand == 3 )
    {
        eInterp = GCI_BlueBand;
    }
    else
    {
        eInterp = GCI_GrayIndex;
    }

    // Do we have any overviews?  Only check if we are the full res image.
    if( nDiscardLevels == 0 && GDALPamRasterBand::GetOverviewCount() == 0 )
    {
        int nXSize = nRasterXSize;
        int nYSize = nRasterYSize;

        for( int nDiscard = 1; nDiscard < nResCount; nDiscard++ )
        {
            nXSize = (nXSize + 1) / 2;
            nYSize = (nYSize + 1) / 2;

            if( (nXSize + nYSize) < 128 || nXSize < 4 || nYSize < 4 )
                continue;  // Skip super reduced resolution layers.

            oCodeStream.apply_input_restrictions(0, 0, nDiscard, 0, nullptr);
            kdu_dims dims;  // Struct with default constructor.
            oCodeStream.get_dims(0, dims);

            if( (dims.size.x == nXSize || dims.size.x == nXSize - 1) &&
                (dims.size.y == nYSize || dims.size.y == nYSize - 1) )
            {
                nOverviewCount++;
                papoOverviewBand = static_cast<JP2KAKRasterBand **>(CPLRealloc(
                    papoOverviewBand, sizeof(void *) * nOverviewCount));
                papoOverviewBand[nOverviewCount - 1] =
                    new JP2KAKRasterBand(nBand, nDiscard, oCodeStream, 0,
                                         jpip_client, oJP2Channels, poBaseDS);
            }
            else
            {
                CPLDebug("GDAL", "Discard %dx%d JPEG2000 overview layer,\n"
                         "expected %dx%d.",
                         dims.size.x, dims.size.y, nXSize, nYSize);
            }
        }
    }
}

/************************************************************************/
/*                         ~JP2KAKRasterBand()                          */
/************************************************************************/

JP2KAKRasterBand::~JP2KAKRasterBand()

{
    for( int i = 0; i < nOverviewCount; i++ )
        delete papoOverviewBand[i];

    CPLFree(papoOverviewBand);
}

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

int JP2KAKRasterBand::GetOverviewCount()

{
    if( GDALPamRasterBand::GetOverviewCount() > 0 )
        return GDALPamRasterBand::GetOverviewCount();

    return nOverviewCount;
}

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

GDALRasterBand *JP2KAKRasterBand::GetOverview( int iOverviewIndex )

{
    if( GDALPamRasterBand::GetOverviewCount() > 0 )
        return GDALPamRasterBand::GetOverview(iOverviewIndex);

    if( iOverviewIndex < 0 || iOverviewIndex >= nOverviewCount )
        return nullptr;

    return papoOverviewBand[iOverviewIndex];
}

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

CPLErr JP2KAKRasterBand::IReadBlock( int nBlockXOff, int nBlockYOff,
                                     void * pImage )
{
    const int nWordSize = GDALGetDataTypeSizeBytes(eDataType);
    int nOvMult = 1;
    int nLevelsLeft = nDiscardLevels;
    while( nLevelsLeft-- > 0 )
        nOvMult *= 2;

    CPLDebug("JP2KAK", "IReadBlock(%d,%d) on band %d.",
             nBlockXOff, nBlockYOff, nBand);

    // Compute the normal window, and buffer size.
    const int nWXOff = nBlockXOff * nBlockXSize * nOvMult;
    const int nWYOff = nBlockYOff * nBlockYSize * nOvMult;
    int nWXSize = nBlockXSize * nOvMult;
    int nWYSize = nBlockYSize * nOvMult;

    int nXSize = nBlockXSize;
    int nYSize = nBlockYSize;

    // Adjust if we have a partial block on the right or bottom of
    // the image.  Unfortunately despite some care I can't seem to
    // always get partial tiles to come from the desired overview
    // level depending on how various things round - hopefully not
    // a big deal.
    if( nWXOff + nWXSize > poBaseDS->GetRasterXSize() )
    {
        nWXSize = poBaseDS->GetRasterXSize() - nWXOff;
        nXSize = nRasterXSize - nBlockXSize * nBlockXOff;
    }

    if( nWYOff + nWYSize > poBaseDS->GetRasterYSize() )
    {
        nWYSize = poBaseDS->GetRasterYSize() - nWYOff;
        nYSize = nRasterYSize - nBlockYSize * nBlockYOff;
    }

    if( nXSize != nBlockXSize || nYSize != nBlockYSize )
        memset(pImage, 0, nBlockXSize * nBlockYSize * nWordSize);

    // By default we invoke just for the requested band, directly
    // into the target buffer.
    GDALRasterIOExtraArg sExtraArg;
    INIT_RASTERIO_EXTRA_ARG(sExtraArg);

    if( !poBaseDS->bUseYCC )
    {
        return poBaseDS->DirectRasterIO(GF_Read,
                                        nWXOff, nWYOff, nWXSize, nWYSize,
                                        pImage, nXSize, nYSize,
                                        eDataType, 1, &nBand,
                                        nWordSize, nWordSize*nBlockXSize,
                                        0, &sExtraArg);
    }

    // But for YCC or possible other effectively pixel interleaved
    // products, we read all bands into a single buffer, fetch out
    // what we want, and push the rest into the block cache.
    std::vector<int> anBands;

    for( int iBand = 0; iBand < poBaseDS->GetRasterCount(); iBand++ )
    {
        GDALRasterBand *poBand = poBaseDS->GetRasterBand(iBand + 1);
        if ( poBand->GetRasterDataType() != eDataType )
          continue;
        anBands.push_back(iBand + 1);
    }

    GByte *pabyWrkBuffer = static_cast<GByte *>(
        VSIMalloc3(nWordSize * anBands.size(), nBlockXSize, nBlockYSize));
    if( pabyWrkBuffer == nullptr )
        return CE_Failure;

    const CPLErr eErr = poBaseDS->DirectRasterIO(
        GF_Read, nWXOff, nWYOff, nWXSize, nWYSize, pabyWrkBuffer, nXSize,
        nYSize, eDataType, static_cast<int>(anBands.size()), &anBands[0],
        nWordSize, nWordSize * nBlockXSize,
        nWordSize * nBlockXSize * nBlockYSize, &sExtraArg);

    if( eErr == CE_None )
    {
        int nBandStart = 0;
        const int nTotalBands = static_cast<int>(anBands.size());
        for( int iBand = 0; iBand < nTotalBands; iBand++ )
        {
            if( anBands[iBand] == nBand )
            {
                // Application requested band.
                memcpy(pImage, pabyWrkBuffer + nBandStart,
                       nWordSize * nBlockXSize * nBlockYSize);
            }
            else
            {
                // All others are pushed into cache.
                GDALRasterBand *poBaseBand =
                    poBaseDS->GetRasterBand(anBands[iBand]);
                JP2KAKRasterBand *poBand = nullptr;

                if( nDiscardLevels == 0 )
                {
                    poBand = dynamic_cast<JP2KAKRasterBand *>(poBaseBand);
                    if( poBand == nullptr )
                    {
                        CPLError(CE_Fatal, CPLE_AssertionFailed,
                                 "dynamic_cast failed.");
                        return CE_Fatal;
                    }
                }
                else
                {
                    int iOver = 0;  // Used after for.

                    for( ; iOver < poBaseBand->GetOverviewCount(); iOver++ )
                    {
                        poBand = dynamic_cast<JP2KAKRasterBand *>(
                            poBaseBand->GetOverview( iOver ) );
                        if( poBand == nullptr )
                            CPLError(CE_Fatal, CPLE_AppDefined,
                                     "Dynamic cast failed");
                        else if( poBand->nDiscardLevels == nDiscardLevels )
                            break;
                    }
                    if( iOver == poBaseBand->GetOverviewCount() )
                    {
                        CPLAssert(false);
                    }
                }

                GDALRasterBlock *poBlock = nullptr;

                if( poBand != nullptr )
                    poBlock =
                        poBand->GetLockedBlockRef(nBlockXOff, nBlockYOff, TRUE);

                if( poBlock )
                {
                    memcpy(poBlock->GetDataRef(), pabyWrkBuffer + nBandStart,
                           nWordSize * nBlockXSize * nBlockYSize);
                    poBlock->DropLock();
                }
            }

            nBandStart += nWordSize * nBlockXSize * nBlockYSize;
        }
    }

    VSIFree(pabyWrkBuffer);
    return eErr;
}

/************************************************************************/
/*                             IRasterIO()                              */
/************************************************************************/

CPLErr
JP2KAKRasterBand::IRasterIO( GDALRWFlag eRWFlag,
                             int nXOff, int nYOff, int nXSize, int nYSize,
                             void * pData, int nBufXSize, int nBufYSize,
                             GDALDataType eBufType,
                             GSpacing nPixelSpace, GSpacing nLineSpace,
                             GDALRasterIOExtraArg* psExtraArg)

{
    // We need various criteria to skip out to block based methods.
    if( poBaseDS->TestUseBlockIO( nXOff, nYOff, nXSize, nYSize,
                                  nBufXSize, nBufYSize,
                                  eBufType, 1, &nBand ) )
        return GDALPamRasterBand::IRasterIO(
            eRWFlag, nXOff, nYOff, nXSize, nYSize,
            pData, nBufXSize, nBufYSize, eBufType,
            nPixelSpace, nLineSpace, psExtraArg );

    int nOverviewDiscard = nDiscardLevels;

    // Adjust request for overview level.
    while( nOverviewDiscard > 0 )
    {
        nXOff *= 2;
        nYOff *= 2;
        nXSize *= 2;
        nYSize *= 2;
        nOverviewDiscard--;
    }

    return poBaseDS->DirectRasterIO(
        eRWFlag, nXOff, nYOff, nXSize, nYSize,
        pData, nBufXSize, nBufYSize, eBufType,
        1, &nBand, nPixelSpace, nLineSpace, 0, psExtraArg );
}

/************************************************************************/
/*                            ApplyPalette()                            */
/************************************************************************/

namespace {

inline short GetColorValue(const float *pafLUT, int nPos)
{
    const short nVal = static_cast<short>(pafLUT[nPos] * 256.0f + 128.0f);
    const short nMin = 0;
    const short nMax = 255;
    return std::max(nMin, std::min(nMax, nVal));
}

}  // namespace

void JP2KAKRasterBand::ApplyPalette( jp2_palette oJP2Palette )

{
    // Do we have a reasonable LUT configuration?  RGB or RGBA?
    if( !oJP2Palette.exists() )
        return;

    if( oJP2Palette.get_num_luts() == 0 || oJP2Palette.get_num_entries() == 0 )
        return;

    if( oJP2Palette.get_num_luts() < 3 )
    {
        CPLDebug("JP2KAK", "JP2KAKRasterBand::ApplyPalette()\n"
                 "Odd get_num_luts() value (%d)",
                 oJP2Palette.get_num_luts());
        return;
    }

    // Fetch lut entries.  They are normalized in the -0.5 to 0.5 range.                                              */
    const int nCount = oJP2Palette.get_num_entries();

    float *const pafLUT =
        static_cast<float *>(CPLCalloc(sizeof(float) * 4, nCount));

    const int nRed = 0;
    const int nGreen = 1;
    const int nBlue = 2;
    const int nAlpha = 3;
    oJP2Palette.get_lut(nRed, pafLUT + 0);
    oJP2Palette.get_lut(nGreen, pafLUT + nCount);
    oJP2Palette.get_lut(nBlue, pafLUT + nCount * 2);

    if( oJP2Palette.get_num_luts() == 4 )
    {
        oJP2Palette.get_lut(nAlpha, pafLUT + nCount * 3);
    }
    else
    {
        for( int iColor = 0; iColor < nCount; iColor++ )
        {
            pafLUT[nCount * 3 + iColor] = 0.5;
        }
    }

    // Apply to GDAL colortable.
    const int nRedOffset = nCount * nRed;
    const int nGreenOffset = nCount * nGreen;
    const int nBlueOffset = nCount * nBlue;
    const int nAlphaOffset = nCount * nAlpha;

    for( int iColor = 0; iColor < nCount; iColor++ )
    {
        const GDALColorEntry sEntry = {
            GetColorValue(pafLUT, iColor + nRedOffset),
            GetColorValue(pafLUT, iColor + nGreenOffset),
            GetColorValue(pafLUT, iColor + nBlueOffset),
            GetColorValue(pafLUT, iColor + nAlphaOffset)
        };

        oCT.SetColorEntry(iColor, &sEntry);
    }

    CPLFree(pafLUT);

    eInterp = GCI_PaletteIndex;
}

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

GDALColorInterp JP2KAKRasterBand::GetColorInterpretation() { return eInterp; }

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

GDALColorTable *JP2KAKRasterBand::GetColorTable()

{
    if( oCT.GetColorEntryCount() > 0 )
        return &oCT;

    return nullptr;
}

/************************************************************************/
/* ==================================================================== */
/*                           JP2KAKDataset                              */
/* ==================================================================== */
/************************************************************************/

/************************************************************************/
/*                           JP2KAKDataset()                           */
/************************************************************************/

JP2KAKDataset::JP2KAKDataset() :
    poInput(nullptr),
    poRawInput(nullptr),
    family(nullptr),
    jpip_client(nullptr),
    bPreferNPReads(false),
    poThreadEnv(nullptr),
    bCached(false),
    bResilient(false),
    bFussy(false),
    bUseYCC(false),
    bPromoteTo8Bit(false)
{
    poDriver = static_cast<GDALDriver *>(GDALGetDriverByName("JP2KAK"));
}

/************************************************************************/
/*                            ~JP2KAKDataset()                         */
/************************************************************************/

JP2KAKDataset::~JP2KAKDataset()

{
    FlushCache();

    if( poInput != nullptr )
    {
        oCodeStream.destroy();
        poInput->close();
        delete poInput;
        if( family )
        {
            family->close();
            delete family;
        }
        if( poRawInput != nullptr )
            delete poRawInput;
#ifdef USE_JPIP
        if( jpip_client != NULL )
        {
            jpip_client->close();
            delete jpip_client;
        }
#endif
    }

    if( poThreadEnv != nullptr )
    {
        poThreadEnv->terminate(nullptr, true);
        poThreadEnv->destroy();
        delete poThreadEnv;
    }
}

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

CPLErr JP2KAKDataset::IBuildOverviews( const char *pszResampling,
                                       int nOverviews, int *panOverviewList,
                                       int nListBands, int *panBandList,
                                       GDALProgressFunc pfnProgress,
                                       void *pProgressData )

{
    // In order for building external overviews to work properly, we
    // discard any concept of internal overviews when the user
    // first requests to build external overviews.
    for( int iBand = 0; iBand < GetRasterCount(); iBand++ )
    {
        JP2KAKRasterBand *poBand =
            dynamic_cast<JP2KAKRasterBand *>(GetRasterBand(iBand + 1));
        if( poBand == nullptr )
        {
            CPLError(CE_Fatal, CPLE_AppDefined, "Dynamic cast failed");
            return CE_Failure;
        }
        for( int i = 0; i < poBand->nOverviewCount; i++ )
            delete poBand->papoOverviewBand[i];

        CPLFree(poBand->papoOverviewBand);
        poBand->papoOverviewBand = nullptr;
        poBand->nOverviewCount = 0;
    }

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

/************************************************************************/
/*                          KakaduInitialize()                          */
/************************************************************************/

void JP2KAKDataset::KakaduInitialize()

{
    // Initialize Kakadu warning/error reporting subsystem.
    if( kakadu_initialized )
        return;

    kakadu_initialized = true;

    kdu_cpl_error_message oErrHandler(CE_Failure);
    kdu_cpl_error_message oWarningHandler(CE_Warning);

    kdu_customize_warnings(new kdu_cpl_error_message(CE_Warning));
    kdu_customize_errors(new kdu_cpl_error_message(CE_Failure));
}

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

int JP2KAKDataset::Identify( GDALOpenInfo * poOpenInfo )

{
    // Check header.
    if( poOpenInfo->nHeaderBytes < static_cast<int>(sizeof(jp2_header)) )
    {
        if( (STARTS_WITH_CI(poOpenInfo->pszFilename, "http://")
             || STARTS_WITH_CI(poOpenInfo->pszFilename, "https://")
             || STARTS_WITH_CI(poOpenInfo->pszFilename, "jpip://"))
            && EQUAL(CPLGetExtension( poOpenInfo->pszFilename ), "jp2") )
        {
#ifdef USE_JPIP
            return TRUE;
#else
            return FALSE;
#endif
        }
        else if( STARTS_WITH_CI(poOpenInfo->pszFilename, "J2K_SUBFILE:") )
            return TRUE;
        else
            return FALSE;
    }

/* -------------------------------------------------------------------- */
/*      Any extension is supported for JP2 files.  Only selected        */
/*      extensions are supported for JPC files since the standard       */
/*      prefix is so short (two bytes).                                 */
/* -------------------------------------------------------------------- */
    if( memcmp(poOpenInfo->pabyHeader, jp2_header, sizeof(jp2_header)) == 0 )
        return TRUE;
    else if( memcmp(poOpenInfo->pabyHeader, jpc_header,
                    sizeof(jpc_header)) == 0 )
    {
        const char *const pszExtension =
            CPLGetExtension(poOpenInfo->pszFilename);
        if( EQUAL(pszExtension,"jpc")
            || EQUAL(pszExtension, "j2k")
            || EQUAL(pszExtension, "jp2")
            || EQUAL(pszExtension, "jpx")
            || EQUAL(pszExtension, "j2c") )
           return TRUE;

        // We also want to handle jpc datastreams vis /vsisubfile.
        if( strstr(poOpenInfo->pszFilename, "vsisubfile") != nullptr )
            return TRUE;
    }

    return FALSE;
}

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

GDALDataset *JP2KAKDataset::Open( GDALOpenInfo * poOpenInfo )

{
#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
    // During fuzzing, do not use Identify to reject crazy content.
    if( !Identify(poOpenInfo) )
        return nullptr;
#endif

    subfile_source *poRawInput = nullptr;
    bool bIsJPIP = false;
    bool bIsSubfile = false;
    GByte *pabyHeader = nullptr;

    const bool bResilient =
        CPLTestBool(CPLGetConfigOption("JP2KAK_RESILIENT", "NO"));

    // Doesn't seem to bring any real performance gain on Linux.
    const bool bBuffered = CPLTestBool(CPLGetConfigOption("JP2KAK_BUFFERED",
#ifdef WIN32
                                                          "YES"
#else
                                                          "NO"
#endif
                                                          ));

    KakaduInitialize();

    // Handle setting up datasource for JPIP.
    const char *pszExtension = CPLGetExtension(poOpenInfo->pszFilename);
    if( poOpenInfo->nHeaderBytes < 16 )
    {
        if( (STARTS_WITH_CI(poOpenInfo->pszFilename, "http://")
             || STARTS_WITH_CI(poOpenInfo->pszFilename, "https://")
             || STARTS_WITH_CI(poOpenInfo->pszFilename, "jpip://"))
            && EQUAL(pszExtension, "jp2") )
        {
            bIsJPIP = true;
        }
        else if( STARTS_WITH_CI(poOpenInfo->pszFilename, "J2K_SUBFILE:") )
        {
            // TODO(schwehr): Why was abySubfileHeader static in r6348?
            GByte abySubfileHeader[16] = {};

            try
            {
                poRawInput = new subfile_source;
                poRawInput->open(poOpenInfo->pszFilename, bResilient,
                                 bBuffered);
                poRawInput->seek(0);

                poRawInput->read(abySubfileHeader, 16);
                poRawInput->seek(0);
            }
            catch( ... )
            {
                return nullptr;
            }

            pabyHeader = abySubfileHeader;

            bIsSubfile = true;
        }
        else
        {
            return nullptr;
        }
    }
    else
    {
        pabyHeader = poOpenInfo->pabyHeader;
    }

    // If we think this should be access via vsil, then open it using
    // subfile_source.  We do this if it does not seem to open normally
    // or if we want to operate in resilient (sequential) mode.
    VSIStatBuf sStat;
    if( poRawInput == nullptr && !bIsJPIP &&
        (bBuffered || bResilient ||
         VSIStat(poOpenInfo->pszFilename, &sStat) != 0) )
    {
        try
        {
            poRawInput = new subfile_source;
            poRawInput->open(poOpenInfo->pszFilename, bResilient, bBuffered);
            poRawInput->seek(0);
        }
        catch( ... )
        {
            delete poRawInput;
            return nullptr;
        }
    }

    // If the header is a JP2 header, mark this as a JP2 dataset.
    if( pabyHeader && memcmp(pabyHeader, jp2_header, sizeof(jp2_header)) == 0 )
        pszExtension = "jp2";

    // Try to open the file in a manner depending on the extension.
    kdu_compressed_source *poInput = nullptr;
    kdu_client *jpip_client = nullptr;
    jp2_palette oJP2Palette;
    jp2_channels oJP2Channels;

    jp2_family_src *family = nullptr;

    try
    {
        if( bIsJPIP )
        {
#ifdef USE_JPIP
            char *pszWrk =
                CPLStrdup(strstr(poOpenInfo->pszFilename, "://") + 3);
            char *pszRequest = strstr(pszWrk, "/");

            if( pszRequest == NULL )
            {
                CPLDebug("JP2KAK", "Failed to parse JPIP server and request.");
                CPLFree(pszWrk);
                return NULL;
            }

            *(pszRequest++) = '\0';

            CPLDebug("JP2KAK", "server=%s, request=%s", pszWrk, pszRequest);

            CPLSleep(15.0);
            jpip_client = new kdu_client;
            jpip_client->connect(pszWrk, NULL, pszRequest, "http-tcp", "");

            CPLDebug("JP2KAK", "After connect()");

            bool bin0_complete = false;

            while( jpip_client->get_databin_length(KDU_META_DATABIN, 0, 0,
                                                   &bin0_complete) <= 0
                   || !bin0_complete )
                CPLSleep( 0.25 );

            family = new jp2_family_src;
            family->open(jpip_client);

            // TODO(schwehr): Check for memory leaks.
            jp2_source *jp2_src = new jp2_source;
            jp2_src->open(family);
            jp2_src->read_header();

            while( !jpip_client->is_idle() )
                CPLSleep(0.25);

            if( jpip_client->is_alive() )
            {
                CPLDebug("JP2KAK", "connect() seems to be complete.");
            }
            else
            {
                CPLDebug("JP2KAK", "connect() seems to have failed.");
                return NULL;
            }

            oJP2Channels = jp2_src->access_channels();

            poInput = jp2_src;
#else
            CPLError(CE_Failure, CPLE_OpenFailed,
                     "JPIP Protocol not supported by GDAL with "
                     "Kakadu 3.4 or on Unix.");
            return nullptr;
#endif
        }
        else if( pszExtension != nullptr &&
                 (EQUAL(pszExtension, "jp2") || EQUAL(pszExtension, "jpx")) )
        {
            family = new jp2_family_src;
            if( poRawInput != nullptr )
                family->open(poRawInput);
            else
                family->open(poOpenInfo->pszFilename, true);
            jp2_source *jp2_src = new jp2_source;
            poInput = jp2_src;
            if( !jp2_src->open(family) || !jp2_src->read_header() )
            {
                CPLDebug("JP2KAK", "Cannot read JP2 boxes");
                delete jp2_src;
                delete family;
                delete poRawInput;
                return nullptr;
            }

            oJP2Palette = jp2_src->access_palette();
            oJP2Channels = jp2_src->access_channels();

            jp2_colour oColors = jp2_src->access_colour();
            if( oColors.get_space() != JP2_sRGB_SPACE &&
                oColors.get_space() != JP2_sLUM_SPACE )
            {
                CPLDebug("JP2KAK",
                         "Unusual ColorSpace=%d, not further interpreted.",
                         static_cast<int>(oColors.get_space()));
            }
        }
        else if( poRawInput == nullptr )
        {
            poInput = new kdu_simple_file_source(poOpenInfo->pszFilename);
        }
        else
        {
            poInput = poRawInput;
            poRawInput = nullptr;
        }
    }
    catch( ... )
    {
        CPLDebug("JP2KAK", "Trapped Kakadu exception.");
        delete family;
        delete poRawInput;
        delete poInput;
        return nullptr;
    }

    // Create a corresponding GDALDataset.
    JP2KAKDataset *poDS = nullptr;

    try
    {
        poDS = new JP2KAKDataset();

        poDS->poInput = poInput;
        poDS->poRawInput = poRawInput;
        poDS->family = family;
        poDS->oCodeStream.create(poInput);
        poDS->oCodeStream.set_persistent();

        poDS->bCached = bBuffered;
        poDS->bResilient = bResilient;
        poDS->bFussy = CPLTestBool(CPLGetConfigOption("JP2KAK_FUSSY", "NO"));

        if( poDS->bFussy )
            poDS->oCodeStream.set_fussy();
        if( poDS->bResilient )
            poDS->oCodeStream.set_resilient();

        poDS->jpip_client = jpip_client;

        // Get overall image size.
        poDS->oCodeStream.get_dims(0, poDS->dims);

        poDS->nRasterXSize = poDS->dims.size.x;
        poDS->nRasterYSize = poDS->dims.size.y;

        // Ensure that all the components have the same dimensions.  If
        // not, just process the first dimension.
        poDS->nBands = poDS->oCodeStream.get_num_components();

        if (poDS->nBands > 1 )
        {
            for( int iDim = 1; iDim < poDS->nBands; iDim++ )
            {
                kdu_dims dim_this_comp;

                poDS->oCodeStream.get_dims(iDim, dim_this_comp);

                if( dim_this_comp != poDS->dims )
                {
                    CPLError(CE_Warning, CPLE_AppDefined,
                             "Some components have mismatched dimensions, "
                             "ignoring all but first.");
                    poDS->nBands = 1;
                    break;
                }
            }
        }

        // Setup the thread environment.

        int nNumThreads = atoi(CPLGetConfigOption("JP2KAK_THREADS", "-1"));
        if( nNumThreads == -1 )
            nNumThreads = kdu_get_num_processors() - 1;

        if( nNumThreads > 0 )
        {
            poDS->poThreadEnv = new kdu_thread_env;
            poDS->poThreadEnv->create();

            for( int iThread=0; iThread < nNumThreads; iThread++ )
            {
                if( !poDS->poThreadEnv->add_thread() )
                {
                    CPLError(CE_Warning, CPLE_AppDefined,
                             "JP2KAK_THREADS: Unable to create thread.");
                    break;
                }
            }
            CPLDebug("JP2KAK", "Using %d threads.", nNumThreads);
        }
        else
        {
            CPLDebug("JP2KAK", "Operating in singlethreaded mode.");
        }

        // Is this a file with poor internal navigation that will end
        // up using a great deal of memory if we use keep persistent
        // parsed information around?  (#3295)
        siz_params *siz = poDS->oCodeStream.access_siz();
        kdu_params *cod = siz->access_cluster(COD_params);
        bool use_precincts = false;

        cod->get(Cuse_precincts, 0, 0, use_precincts);

        const char *pszPersist = CPLGetConfigOption("JP2KAK_PERSIST", "AUTO");
        if( EQUAL(pszPersist, "AUTO") )
        {
            if( !use_precincts && !bIsJPIP &&
                (poDS->nRasterXSize * static_cast<double>(poDS->nRasterYSize)) >
                    100000000.0 )
                poDS->bPreferNPReads = true;
        }
        else
        {
            poDS->bPreferNPReads = !CPLTestBool(pszPersist);
        }

        CPLDebug("JP2KAK", "Cuse_precincts=%d, PreferNonPersistentReads=%d",
                 use_precincts ? 1 : 0, poDS->bPreferNPReads ? 1 : 0);

        //  Deduce some other info about the dataset.
        int order = 0;

        cod->get(Corder, 0, 0, order);

        // TODO(schwehr): Why not a switch statement?
        if( order == Corder_LRCP )
        {
            CPLDebug("JP2KAK", "order=LRCP");
            poDS->SetMetadataItem("Corder", "LRCP");
        }
        else if( order == Corder_RLCP )
        {
            CPLDebug("JP2KAK", "order=RLCP");
            poDS->SetMetadataItem("Corder", "RLCP");
        }
        else if( order == Corder_RPCL )
        {
            CPLDebug("JP2KAK", "order=RPCL");
            poDS->SetMetadataItem("Corder", "RPCL");
        }
        else if( order == Corder_PCRL )
        {
            CPLDebug("JP2KAK", "order=PCRL");
            poDS->SetMetadataItem("Corder", "PCRL");
        }
        else if( order == Corder_CPRL )
        {
            CPLDebug("JP2KAK", "order=CPRL");
            poDS->SetMetadataItem("Corder", "CPRL");
        }
        else
        {
            CPLDebug("JP2KAK", "order=%d, not recognized.", order);
        }

        poDS->bUseYCC = false;
        cod->get(Cycc, 0, 0, poDS->bUseYCC);
        if( poDS->bUseYCC )
            CPLDebug("JP2KAK", "ycc=true");

        // Find out how many resolutions levels are available.
        kdu_dims tile_indices;
        poDS->oCodeStream.get_valid_tiles(tile_indices);

        kdu_tile tile = poDS->oCodeStream.open_tile(tile_indices.pos);
        poDS->nResCount = tile.access_component(0).get_num_resolutions();
        tile.close();

        CPLDebug("JP2KAK", "nResCount=%d", poDS->nResCount);

        // Should we promote alpha channel to 8 bits?
        poDS->bPromoteTo8Bit =
            poDS->nBands == 4 &&
            poDS->oCodeStream.get_bit_depth(0) == 8 &&
            poDS->oCodeStream.get_bit_depth(1) == 8 &&
            poDS->oCodeStream.get_bit_depth(2) == 8 &&
            poDS->oCodeStream.get_bit_depth(3) == 1 &&
            CPLFetchBool(poOpenInfo->papszOpenOptions,
                         "1BIT_ALPHA_PROMOTION", true);
        if( poDS->bPromoteTo8Bit )
            CPLDebug("JP2KAK",
                     "Fourth (alpha) band is promoted from 1 bit to 8 bit");

        // Create band information objects.
        for( int iBand = 1; iBand <= poDS->nBands; iBand++ )
        {
            JP2KAKRasterBand *poBand = new JP2KAKRasterBand(
                iBand, 0, poDS->oCodeStream, poDS->nResCount, jpip_client,
                oJP2Channels, poDS);

            if( iBand == 1 && oJP2Palette.exists() )
                poBand->ApplyPalette( oJP2Palette );

            poDS->SetBand( iBand, poBand );
        }

        // Look for supporting coordinate system information.
        if( poOpenInfo->nHeaderBytes != 0 )
        {
            poDS->LoadJP2Metadata(poOpenInfo);
        }

        // Establish our corresponding physical file.
        CPLString osPhysicalFilename = poOpenInfo->pszFilename;

        if( bIsSubfile ||
            STARTS_WITH_CI(poOpenInfo->pszFilename, "/vsisubfile/") )
        {
            const char *comma = strstr(poOpenInfo->pszFilename, ",");
            if( comma != nullptr )
                osPhysicalFilename = comma + 1;
        }

/* -------------------------------------------------------------------- */
/*      Initialize any PAM information.                                 */
/* -------------------------------------------------------------------- */
        poDS->SetDescription(poOpenInfo->pszFilename);
        if( !bIsSubfile )
            poDS->TryLoadXML();
        else
            poDS->nPamFlags |= GPF_NOSAVE;

        // Check for external overviews.
        poDS->oOvManager.Initialize(poDS, osPhysicalFilename);

        // Confirm the requested access is supported.
        if( poOpenInfo->eAccess == GA_Update )
        {
            delete poDS;
            CPLError(CE_Failure, CPLE_NotSupported,
                     "The JP2KAK driver does not support "
                     "update access to existing datasets.");
            return nullptr;
        }

        // Vector layers.
        if( poOpenInfo->nOpenFlags & GDAL_OF_VECTOR )
        {
            poDS->LoadVectorLayers(CPLFetchBool(poOpenInfo->papszOpenOptions,
                                                "OPEN_REMOTE_GML", false));

            // If file opened in vector-only mode and there's no vector,
            // return.
            if( (poOpenInfo->nOpenFlags & GDAL_OF_RASTER) == 0 &&
                poDS->GetLayerCount() == 0 )
            {
                delete poDS;
                return nullptr;
            }
        }

        return poDS;
    }
    catch( ... )
    {
        CPLDebug("JP2KAK", "JP2KAKDataset::Open() - caught exception.");
        if( poDS != nullptr )
            delete poDS;

        return nullptr;
    }
}

/************************************************************************/
/*                           DirectRasterIO()                           */
/************************************************************************/

CPLErr
JP2KAKDataset::DirectRasterIO( GDALRWFlag /* eRWFlag */,
                               int nXOff, int nYOff, int nXSize, int nYSize,
                               void * pData, int nBufXSize, int nBufYSize,
                               GDALDataType eBufType,
                               int nBandCount, int *panBandMap,
                               GSpacing nPixelSpace, GSpacing nLineSpace,
                               GSpacing nBandSpace,
                               GDALRasterIOExtraArg* psExtraArg)

{
    CPLAssert(eBufType == GDT_Byte || eBufType == GDT_Int16 ||
              eBufType == GDT_UInt16);

    kdu_codestream *poCodeStream = &oCodeStream;
    const char *pszPersistency = "";

    // Do we want to do this non-persistently?  If so, we need to
    // open the file, and establish a local codestream.
    subfile_source subfile_src;
    jp2_source wrk_jp2_src;
    jp2_family_src wrk_family;
    kdu_codestream oWCodeStream;

    if( bPreferNPReads )
    {
        subfile_src.open(GetDescription(), bResilient, bCached);

        if( family != nullptr )
        {
            wrk_family.open(&subfile_src);
            wrk_jp2_src.open(&wrk_family);
            wrk_jp2_src.read_header();

            oWCodeStream.create(&wrk_jp2_src);
        }
        else
        {
            oWCodeStream.create(&subfile_src);
        }

        if( bFussy )
            oWCodeStream.set_fussy();
        if( bResilient )
            oWCodeStream.set_resilient();

        poCodeStream = &oWCodeStream;

        pszPersistency = "(non-persistent)";
    }

    // Select optimal resolution level.
    int nDiscardLevels = 0;
    int nResMult = 1;

    while( nDiscardLevels < nResCount - 1 &&
           nBufXSize * nResMult * 2 < nXSize * 1.01 &&
           nBufYSize * nResMult * 2 < nYSize * 1.01 )
    {
        nDiscardLevels++;
        nResMult *= 2;
    }

    // Prepare component indices list.
    CPLErr eErr = CE_None;

    const size_t nBandSize = sizeof(int) * nBandCount;
    int *component_indices = static_cast<int *>(CPLMalloc(nBandSize));
    int *stripe_heights = static_cast<int *>(CPLMalloc(nBandSize));
    int *sample_offsets = static_cast<int *>(CPLMalloc(nBandSize));
    int *sample_gaps = static_cast<int *>(CPLMalloc(nBandSize));
    int *row_gaps = static_cast<int *>(CPLMalloc(nBandSize));
    int *precisions = static_cast<int *>(CPLMalloc(nBandSize));
    bool *is_signed = static_cast<bool *>(CPLMalloc(nBandSize));

    for( int i = 0; i < nBandCount; i++ )
        component_indices[i] = panBandMap[i] - 1;

    // Setup a ROI matching the block requested, and select desired
    // bands (components).
    try
    {
        poCodeStream->apply_input_restrictions(0, 0, nDiscardLevels, 0, nullptr);
        kdu_dims l_dims;
        poCodeStream->get_dims(0, l_dims);
        const int nOvrXSize = l_dims.size.x;
        const int nOvrYSize = l_dims.size.y;

        l_dims.pos.x = l_dims.pos.x + nXOff / nResMult;
        l_dims.pos.y = l_dims.pos.y + nYOff / nResMult;
        l_dims.size.x = nXSize / nResMult;
        l_dims.size.y = nYSize / nResMult;

        // Check if rounding helps detecting when data is being requested
        // exactly at the current resolution.
        if( nBufXSize != l_dims.size.x &&
            static_cast<int>(0.5 + static_cast<double>(nXSize) / nResMult)
            == nBufXSize )
        {
            l_dims.size.x = nBufXSize;
        }
        if( nBufYSize != l_dims.size.y &&
            static_cast<int>(0.5 + static_cast<double>(nYSize) / nResMult)
            == nBufYSize )
        {
            l_dims.size.y = nBufYSize;
        }
        if( l_dims.pos.x + l_dims.size.x > nOvrXSize )
            l_dims.size.x = nOvrXSize - l_dims.pos.x;
        if( l_dims.pos.y + l_dims.size.y > nOvrYSize )
            l_dims.size.y = nOvrYSize - l_dims.pos.y;

        kdu_dims l_dims_roi;

        poCodeStream->map_region(0, l_dims, l_dims_roi);
        poCodeStream->apply_input_restrictions(nBandCount, component_indices,
                                               nDiscardLevels, 0, &l_dims_roi,
                                               KDU_WANT_OUTPUT_COMPONENTS);

        // Special case where the data is being requested exactly at
        // this resolution.  Avoid any extra sampling pass.
        if( nBufXSize == l_dims.size.x && nBufYSize == l_dims.size.y )
        {
            kdu_stripe_decompressor decompressor;
            decompressor.start(*poCodeStream, false, false, poThreadEnv);

            CPLDebug("JP2KAK", "DirectRasterIO() for %d,%d,%d,%d -> %dx%d "
                     "(no intermediate) %s",
                     nXOff, nYOff, nXSize, nYSize, nBufXSize, nBufYSize,
                     pszPersistency);

            for( int i = 0; i < nBandCount; i++ )
            {
                stripe_heights[i] = l_dims.size.y;
                precisions[i] = poCodeStream->get_bit_depth(i);
                if( eBufType == GDT_Byte )
                {
                    is_signed[i] = false;
                    sample_offsets[i] = static_cast<int>(i * nBandSpace);
                    sample_gaps[i] = static_cast<int>(nPixelSpace);
                    row_gaps[i] = static_cast<int>(nLineSpace);
                }
                else if( eBufType == GDT_Int16 )
                {
                    is_signed[i] = true;
                    sample_offsets[i] = static_cast<int>(i * nBandSpace / 2);
                    sample_gaps[i] = static_cast<int>(nPixelSpace / 2);
                    row_gaps[i] = static_cast<int>(nLineSpace / 2);
                }
                else if( eBufType == GDT_UInt16 )
                {
                    is_signed[i] = false;
                    sample_offsets[i] = static_cast<int>(i * nBandSpace / 2);
                    sample_gaps[i] = static_cast<int>(nPixelSpace / 2);
                    row_gaps[i] = static_cast<int>(nLineSpace / 2);
                    /* Introduced in r25136 with an unrelated commit message.
                    Reverted per ticket #5328
                    if( precisions[i] == 12 )
                    {
                      CPLDebug( "JP2KAK", "16bit extend 12 bit data." );
                      precisions[i] = 16;
                    }*/
                }
            }

            if( eBufType == GDT_Byte )
                decompressor.pull_stripe(
                    static_cast<kdu_byte *>(pData), stripe_heights,
                    sample_offsets, sample_gaps, row_gaps,
                    precisions);
            else
                decompressor.pull_stripe(
                    static_cast<kdu_int16 *>(pData), stripe_heights,
                    sample_offsets, sample_gaps, row_gaps,
                    precisions, is_signed);
            decompressor.finish();
        }
        else
        {
            // More general case - first pull into working buffer.

            const int nDataTypeSize = GDALGetDataTypeSizeBytes(eBufType);
            GByte *pabyIntermediate = static_cast<GByte *>(VSI_MALLOC3_VERBOSE(
                l_dims.size.x, l_dims.size.y, nDataTypeSize * nBandCount));
            if( pabyIntermediate == nullptr )
            {
                return CE_Failure;
            }

            CPLDebug("JP2KAK",
                     "DirectRasterIO() for %d,%d,%d,%d -> %dx%d -> %dx%d %s",
                     nXOff, nYOff, nXSize, nYSize, l_dims.size.x, l_dims.size.y,
                     nBufXSize, nBufYSize, pszPersistency);

            kdu_stripe_decompressor decompressor;
            decompressor.start(*poCodeStream, false, false, poThreadEnv);

            for( int i = 0; i < nBandCount; i++ )
            {
                stripe_heights[i] = l_dims.size.y;
                precisions[i] = poCodeStream->get_bit_depth(i);

                if( eBufType == GDT_Int16 || eBufType == GDT_UInt16 )
                {
                    is_signed[i] = eBufType == GDT_Int16;
                }
            }

            if( eBufType == GDT_Byte )
                decompressor.pull_stripe(
                    reinterpret_cast<kdu_byte *>(pabyIntermediate),
                    stripe_heights, nullptr, nullptr, nullptr, precisions);
            else
                decompressor.pull_stripe(
                    reinterpret_cast<kdu_int16 *>(pabyIntermediate),
                    stripe_heights, nullptr, nullptr, nullptr, precisions, is_signed);

            decompressor.finish();

            if( psExtraArg->eResampleAlg == GRIORA_NearestNeighbour )
            {
                // Then resample (normally downsample) from the intermediate
                // buffer into the final buffer in the desired output layout.
                const double dfYRatio =
                    l_dims.size.y / static_cast<double>(nBufYSize);
                const double dfXRatio =
                    l_dims.size.x / static_cast<double>(nBufXSize);

                for( int iY = 0; iY < nBufYSize; iY++ )
                {
                    const int iSrcY = std::min(
                        static_cast<int>(floor((iY + 0.5) * dfYRatio)),
                        l_dims.size.y - 1);

                    for( int iX = 0; iX < nBufXSize; iX++ )
                    {
                        const int iSrcX = std::min(
                            static_cast<int>(floor((iX + 0.5) * dfXRatio)),
                            l_dims.size.x - 1);

                        for( int i = 0; i < nBandCount; i++ )
                        {
                            // TODO(schwehr): Cleanup this block.
                            if( eBufType == GDT_Byte )
                                ((GByte *) pData)[iX*nPixelSpace
                                                + iY*nLineSpace
                                                + i*nBandSpace] =
                                    pabyIntermediate[iSrcX*nBandCount
                                                    + iSrcY*l_dims.size.x*nBandCount
                                                    + i];
                            else if( eBufType == GDT_Int16
                                    || eBufType == GDT_UInt16 )
                                ((GUInt16 *) pData)[iX*nPixelSpace/2
                                                + iY*nLineSpace/2
                                                + i*nBandSpace/2] =
                                    ((GUInt16 *)pabyIntermediate)[
                                        iSrcX*nBandCount
                                        + iSrcY*l_dims.size.x*nBandCount
                                        + i];
                        }
                    }
                }
            }
            else
            {
                // Create a MEM dataset that wraps the input buffer.
                GDALDataset* poMEMDS = MEMDataset::Create( "", l_dims.size.x,
                                                           l_dims.size.y, 0,
                                                           eBufType, nullptr);
                char szBuffer[64] = { '\0' };
                int nRet = 0;

                for( int i = 0; i < nBandCount; i++ )
                {

                    nRet = CPLPrintPointer(
                        szBuffer, pabyIntermediate + i * nDataTypeSize,
                        sizeof(szBuffer) );
                    szBuffer[nRet] = 0;
                    char **papszOptions =
                        CSLSetNameValue(nullptr, "DATAPOINTER", szBuffer);

                    papszOptions = CSLSetNameValue(papszOptions, "PIXELOFFSET",
                        CPLSPrintf(
                            CPL_FRMT_GIB,
                            static_cast<GIntBig>(nDataTypeSize) * nBandCount));

                    papszOptions = CSLSetNameValue(papszOptions, "LINEOFFSET",
                        CPLSPrintf(
                            CPL_FRMT_GIB,
                            static_cast<GIntBig>(nDataTypeSize)
                            * nBandCount * l_dims.size.x) );

                    poMEMDS->AddBand(eBufType, papszOptions);
                    CSLDestroy(papszOptions);

                    const char *pszNBITS =
                        GetRasterBand(i + 1)
                            ->GetMetadataItem("NBITS", "IMAGE_STRUCTURE");
                    if( pszNBITS )
                        poMEMDS->GetRasterBand(i + 1)->SetMetadataItem(
                            "NBITS", pszNBITS, "IMAGE_STRUCTURE");
                }

                GDALRasterIOExtraArg sExtraArgTmp;
                INIT_RASTERIO_EXTRA_ARG(sExtraArgTmp);
                sExtraArgTmp.eResampleAlg = psExtraArg->eResampleAlg;

                CPL_IGNORE_RET_VAL(
                    poMEMDS->RasterIO(
                        GF_Read, 0, 0, l_dims.size.x, l_dims.size.y,
                        pData, nBufXSize, nBufYSize,
                        eBufType,
                        nBandCount, nullptr,
                        nPixelSpace, nLineSpace, nBandSpace,
                        &sExtraArgTmp ) );

                GDALClose(poMEMDS);
            }

            CPLFree(pabyIntermediate);
        }
    }
    catch( ... )
    {
        // Catch internal Kakadu errors.
        eErr = CE_Failure;
    }

    // 1-bit alpha promotion.
    if( nBandCount == 4 && bPromoteTo8Bit )
    {
        for( int j = 0; j < nBufYSize; j++ )
        {
            for( int i = 0; i < nBufXSize; i++ )
            {
                static_cast<GByte *>(
                    pData)[j * nLineSpace + i * nPixelSpace + 3 * nBandSpace] *=
                    255;
            }
        }
    }
/* -------------------------------------------------------------------- */
/*      Cleanup                                                         */
/* -------------------------------------------------------------------- */
    if( poCodeStream == &oWCodeStream )
    {
        oWCodeStream.destroy();
        wrk_jp2_src.close();
        wrk_family.close();
        subfile_src.close();
    }

    CPLFree(component_indices);
    CPLFree(stripe_heights);
    CPLFree(sample_offsets);
    CPLFree(sample_gaps);
    CPLFree(row_gaps);
    CPLFree(precisions);
    CPLFree(is_signed);

    return eErr;
}

/************************************************************************/
/*                           TestUseBlockIO()                           */
/*                                                                      */
/*      Check whether we should use blocked IO (true) or direct io      */
/*      (FALSE) for a given request configuration and environment.      */
/************************************************************************/

bool
JP2KAKDataset::TestUseBlockIO( int nXOff, int nYOff, int nXSize, int nYSize,
                               int nBufXSize, int nBufYSize,
                               GDALDataType eDataType,
                               int nBandCount, int *panBandList )

{
    // Due to limitations in DirectRasterIO() we can only handle
    // 8bit and with no duplicates in the band list.
    if( eDataType != GetRasterBand(1)->GetRasterDataType()
        || ( eDataType != GDT_Byte
             && eDataType != GDT_Int16
             && eDataType != GDT_UInt16 ) )
        return true;

    for( int i = 0; i < nBandCount; i++ )
    {
        for( int j = i + 1; j < nBandCount; j++ )
            if( panBandList[j] == panBandList[i] )
                return true;
    }

    // If we have external overviews built and they could be used to satisfy
    // this request, we will avoid DirectRasterIO() which would ignore them.
    if( GetRasterCount() == 0 )
        return true;

    JP2KAKRasterBand *poWrkBand =
        dynamic_cast<JP2KAKRasterBand *>(GetRasterBand(1));
    if( poWrkBand == nullptr )
    {
        CPLError( CE_Fatal, CPLE_AppDefined, "Dynamic cast failed" );
        return false;
    }
    if( poWrkBand->HasExternalOverviews() )
    {
        int nXOff2 = nXOff;
        int nYOff2 = nYOff;
        int nXSize2 = nXSize;
        int nYSize2 = nYSize;

        const int nOverview =
            GDALBandGetBestOverviewLevel2(poWrkBand, nXOff2, nYOff2, nXSize2,
                                          nYSize2, nBufXSize, nBufYSize, nullptr);
        if( nOverview >= 0 )
            return true;
    }

    // The rest of the rules are io strategy stuff and configuration checks.
    bool bUseBlockedIO = bForceCachedIO;

    if( nYSize == 1 || nXSize * static_cast<double>(nYSize) < 100.0 )
        bUseBlockedIO = true;

    if( nBufYSize == 1 || nBufXSize * static_cast<double>(nBufYSize) < 100.0 )
        bUseBlockedIO = true;

    if( strlen(CPLGetConfigOption("GDAL_ONE_BIG_READ", "")) > 0 )
        bUseBlockedIO =
            !CPLTestBool(CPLGetConfigOption("GDAL_ONE_BIG_READ", ""));

    return bUseBlockedIO;
}

/************************************************************************/
/*                             IRasterIO()                              */
/************************************************************************/

CPLErr JP2KAKDataset::IRasterIO( GDALRWFlag eRWFlag,
                                 int nXOff, int nYOff, int nXSize, int nYSize,
                                 void * pData, int nBufXSize, int nBufYSize,
                                 GDALDataType eBufType,
                                 int nBandCount, int *panBandMap,
                                 GSpacing nPixelSpace, GSpacing nLineSpace,
                                 GSpacing nBandSpace,
                                 GDALRasterIOExtraArg* psExtraArg)

{
    // We need various criteria to skip out to block based methods.
    if( TestUseBlockIO(nXOff, nYOff, nXSize, nYSize, nBufXSize, nBufYSize,
                       eBufType, nBandCount, panBandMap) )
        return GDALPamDataset::IRasterIO(
            eRWFlag, nXOff, nYOff, nXSize, nYSize,
            pData, nBufXSize, nBufYSize, eBufType,
            nBandCount, panBandMap, nPixelSpace, nLineSpace, nBandSpace,
            psExtraArg );

    return DirectRasterIO(
        eRWFlag, nXOff, nYOff, nXSize, nYSize, pData, nBufXSize, nBufYSize,
        eBufType, nBandCount, panBandMap, nPixelSpace, nLineSpace,
        nBandSpace, psExtraArg );
}

/************************************************************************/
/*                           JP2KAKWriteBox()                           */
/*                                                                      */
/*      Write out the passed box and delete it.                         */
/************************************************************************/

static void JP2KAKWriteBox( jp2_family_tgt *jp2_family, GDALJP2Box *poBox )

{
    if( poBox == nullptr )
        return;

    jp2_output_box jp2_out;

    GUInt32 nBoxType = 0;
    memcpy(&nBoxType, poBox->GetType(), sizeof(nBoxType));
    CPL_MSBPTR32(&nBoxType);

    int length = static_cast<int>(poBox->GetDataLength());

    // Write to a box on the JP2 file.
    jp2_out.open(jp2_family, nBoxType);
    jp2_out.set_target_size(length);
    jp2_out.write(const_cast<kdu_byte *>(poBox->GetWritableData()),
                   length);
    jp2_out.close();

    delete poBox;
}

/************************************************************************/
/*                     JP2KAKCreateCopy_WriteTile()                     */
/************************************************************************/

static bool
JP2KAKCreateCopy_WriteTile( GDALDataset *poSrcDS, kdu_tile &oTile,
                            kdu_roi_image *poROIImage,
                            int nXOff, int nYOff, int nXSize, int nYSize,
                            bool bReversible, int nBits, GDALDataType eType,
                            kdu_codestream &oCodeStream, int bFlushEnabled,
                            kdu_long *layer_bytes, int layer_count,
                            GDALProgressFunc pfnProgress, void * pProgressData,
                            bool bComseg )

{
    // Create one big tile, a compressing engine, and a line buffer for each
    // component.
    const int num_components = oTile.get_num_components();
    kdu_push_ifc *engines = new kdu_push_ifc[num_components];
    kdu_line_buf *lines = new kdu_line_buf[num_components];
    kdu_sample_allocator allocator;

    // Ticket #4050 patch: Use a 32 bits kdu_line_buf for GDT_UInt16 reversible
    // compression.
    // TODO: Test for GDT_UInt16?
    bool bUseShorts = bReversible;
    if( eType == GDT_UInt16 && bReversible )
        bUseShorts = false;

    for( int c = 0; c < num_components; c++ )
    {
        kdu_resolution res = oTile.access_component(c).access_resolution();
        kdu_roi_node *roi_node = nullptr;

        if( poROIImage != nullptr )
        {
            kdu_dims dims;

            res.get_dims(dims);
            roi_node = poROIImage->acquire_node(c, dims);
        }
#if KDU_MAJOR_VERSION >= 7
        lines[c].pre_create(&allocator, nXSize, bReversible, bUseShorts, 0, 0);
#else
        lines[c].pre_create(&allocator, nXSize, bReversible, bUseShorts);
#endif
        engines[c] = kdu_analysis(res, &allocator, bUseShorts, 1.0F, roi_node);
    }

    try
    {
#if KDU_MAJOR_VERSION > 7 || (KDU_MAJOR_VERSION == 7 && (KDU_MINOR_VERSION > 3 || KDU_MINOR_VERSION == 3 && KDU_PATCH_VERSION >= 1))
        allocator.finalize(oCodeStream);
#else
        allocator.finalize();
#endif

        for( int c = 0; c < num_components; c++ )
            lines[c].create();
    }
    catch( ... )
    {
        // TODO(schwehr): Should this block do any cleanup?
        CPLError(CE_Failure, CPLE_AppDefined,
                 "allocate.finalize() failed, likely out of memory for "
                 "compression information.");
        return false;
    }

    // Write whole image.  Write 1024 lines of each component, then
    // go back to the first, and do again.  This gives the rate
    // computing machine all components to make good estimates.
    int iLinesWritten = 0;

    // TODO(schwehr): Making pabyBuffer void* should simplify the casting below.
    GByte *pabyBuffer = static_cast<GByte *>(
        CPLMalloc(nXSize * GDALGetDataTypeSizeBytes(eType)));

    CPLAssert(!oTile.get_ycc());

    bool bRet = true;
    for( int iLine = 0; iLine < nYSize && bRet; iLine += TILE_CHUNK_SIZE )
    {
        for( int c = 0; c < num_components && bRet; c++ )
        {
            GDALRasterBand *poBand = poSrcDS->GetRasterBand(c + 1);

            for( int iSubline = iLine;
                 iSubline < iLine + TILE_CHUNK_SIZE && iSubline < nYSize;
                 iSubline++ )
            {
                if( poBand->RasterIO( GF_Read,
                                      nXOff, nYOff+iSubline, nXSize, 1,
                                      pabyBuffer, nXSize, 1, eType,
                                      0, 0, nullptr ) == CE_Failure )
                {
                    bRet = false;
                    break;
                }

                if( bReversible && eType == GDT_Byte )
                {
                    kdu_sample16 *dest = lines[c].get_buf16();
                    kdu_byte *sp = pabyBuffer;
                    const kdu_int16 nOffset = 1 << (nBits - 1);

                    for( int n = nXSize; n > 0; n--, dest++, sp++ )
                        dest->ival = ((kdu_int16)(*sp)) - nOffset;
                }
                else if( bReversible && eType == GDT_Int16 )
                {
                    kdu_sample16 *dest = lines[c].get_buf16();
                    GInt16 *sp = reinterpret_cast<GInt16 *>(pabyBuffer);

                    for( int n = nXSize; n > 0; n--, dest++, sp++ )
                        dest->ival = *sp;
                }
                else if( bReversible && eType == GDT_UInt16 )
                {
                    // Ticket #4050 patch : use a 32 bits kdu_line_buf for
                    // GDT_UInt16 reversible compression.
                    kdu_sample32 *dest = lines[c].get_buf32();
                    GUInt16 *sp = reinterpret_cast<GUInt16 *>(pabyBuffer);
                    const kdu_int32 nOffset = 1 << (nBits - 1);

                    for( int n=nXSize; n > 0; n--, dest++, sp++ )
                        dest->ival = static_cast<kdu_int32>(*sp) - nOffset;
                }
                else if( eType == GDT_Byte )
                {
                    kdu_sample32 *dest = lines[c].get_buf32();
                    kdu_byte *sp = pabyBuffer;
                    const int nOffset = 1 << (nBits - 1);
                    const float fScale = 1.0f / (1 << nBits);

                    for (int n = nXSize; n > 0; n--, dest++, sp++)
                        dest->fval =
                            (static_cast<kdu_int16>(*sp) - nOffset) * fScale;
                }
                else if( eType == GDT_Int16 )
                {
                    kdu_sample32 *dest = lines[c].get_buf32();
                    GInt16 *sp = reinterpret_cast<GInt16 *>(pabyBuffer);
                    const float fScale = 1.0f / (1 << nBits);

                    for( int n = nXSize; n > 0; n--, dest++, sp++ )
                        dest->fval = static_cast<kdu_int16>(*sp) * fScale;
                }
                else if( eType == GDT_UInt16 )
                {
                    kdu_sample32 *dest = lines[c].get_buf32();
                    GUInt16 *sp = reinterpret_cast<GUInt16 *>(pabyBuffer);
                    const int nOffset = 1 << (nBits - 1);
                    const float fScale = 1.0f / (1 << nBits);

                    for( int n = nXSize; n > 0; n--, dest++, sp++ )
                        dest->fval = (static_cast<int>(*sp) - nOffset) * fScale;
                }
                else if( eType == GDT_Float32 )
                {
                    kdu_sample32 *dest = lines[c].get_buf32();
                    float *sp = reinterpret_cast<float *>(pabyBuffer);

                    for( int n = nXSize; n > 0; n--, dest++, sp++ )
                        dest->fval = *sp;  // Scale it?
                }

#if KDU_MAJOR_VERSION >= 7
                engines[c].push(lines[c]);
#else
                engines[c].push(lines[c], true);
#endif
                iLinesWritten++;

                if( !pfnProgress(iLinesWritten / static_cast<double>(
                                                     num_components * nYSize),
                                 nullptr, pProgressData) )
                {
                    bRet = false;
                    break;
                }
            }
        }
        if( !bRet )
            break;

        if( oCodeStream.ready_for_flush() && bFlushEnabled )
        {
            CPLDebug("JP2KAK", "Calling oCodeStream.flush() at line %d",
                     std::min(nYSize, iLine + TILE_CHUNK_SIZE));
            try
            {
                oCodeStream.flush(layer_bytes, layer_count, nullptr,
                                  true, bComseg);
            }
            catch(...)
            {
                bRet = false;
            }
        }
        else if( bFlushEnabled )
        {
            CPLDebug("JP2KAK", "read_for_flush() is false at line %d.", iLine);
        }
    }

    for( int c = 0; c < num_components; c++ )
        engines[c].destroy();

    delete[] engines;
    delete[] lines;

    CPLFree(pabyBuffer);

    if( poROIImage != nullptr )
        delete poROIImage;

    return bRet;
    // For some reason cppcheck thinks that engines and lines are leaking.
    // cppcheck-suppress memleak
}

/************************************************************************/
/*                             CreateCopy()                             */
/************************************************************************/

static GDALDataset *
JP2KAKCreateCopy( const char * pszFilename, GDALDataset *poSrcDS,
                  int bStrict, char ** papszOptions,
                  GDALProgressFunc pfnProgress, void * pProgressData )

{
    if( poSrcDS->GetRasterCount() == 0 )
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "Creating zero band files not supported by JP2KAK driver.");
        return nullptr;
    }

    // Initialize Kakadu warning/error reporting subsystem.
    if( !kakadu_initialized )
    {
        kakadu_initialized = true;

        kdu_cpl_error_message oErrHandler(CE_Failure);
        kdu_cpl_error_message oWarningHandler(CE_Warning);

        kdu_customize_warnings(new kdu_cpl_error_message(CE_Warning));
        kdu_customize_errors(new kdu_cpl_error_message(CE_Failure));
    }

    // What data type should we use?  We assume all datatypes match
    // the first band.
    GDALRasterBand *poPrototypeBand = poSrcDS->GetRasterBand(1);

    GDALDataType eType = poPrototypeBand->GetRasterDataType();
    if( eType != GDT_Byte && eType != GDT_Int16 && eType != GDT_UInt16 &&
        eType != GDT_Float32 )
    {
        if( bStrict )
        {
            CPLError(CE_Failure, CPLE_AppDefined,
                     "JP2KAK (JPEG2000) driver does not support data type %s.",
                     GDALGetDataTypeName(eType));
            return nullptr;
        }

        CPLError(CE_Warning, CPLE_AppDefined,
                 "JP2KAK (JPEG2000) driver does not support data type %s, "
                 "forcing to Float32.",
                 GDALGetDataTypeName(eType));

        eType = GDT_Float32;
    }

    // Do we want to write a pseudo-colored image?
    const int bHaveCT =
        poPrototypeBand->GetColorTable() != nullptr &&
        poSrcDS->GetRasterCount() == 1;

    // How many layers?
    int layer_count = 12;

    if( CSLFetchNameValue(papszOptions,"LAYERS") != nullptr )
        layer_count = atoi(CSLFetchNameValue(papszOptions, "LAYERS"));
    else if( CSLFetchNameValue(papszOptions,"Clayers") != nullptr )
        layer_count = atoi(CSLFetchNameValue(papszOptions, "Clayers"));

    // Establish how many bytes of data we want for each layer.
    // We take the quality as a percentage, so if QUALITY of 50 is
    // selected, we will set the base layer to 50% the default size.
    // We let the other layers be computed internally.

    const double dfQuality =
        CSLFetchNameValue(papszOptions,"QUALITY") != nullptr
        ? CPLAtof(CSLFetchNameValue(papszOptions, "QUALITY"))
        : 20.0;

    if( dfQuality < 0.01 || dfQuality > 100.0 )
    {
        CPLError(CE_Failure, CPLE_IllegalArg,
                 "QUALITY=%s is not a legal value in the range 0.01-100.",
                 CSLFetchNameValue(papszOptions, "QUALITY"));
        return nullptr;
    }

    kdu_long *layer_bytes =
        static_cast<kdu_long *>(CPLCalloc(sizeof(kdu_long), layer_count));

    const int nXSize = poSrcDS->GetRasterXSize();
    const int nYSize = poSrcDS->GetRasterYSize();

    bool bReversible = false;

    if( dfQuality < 99.5 )
    {
        double dfLayerBytes =
            (nXSize * static_cast<double>(nYSize) * dfQuality / 100.0)
            * GDALGetDataTypeSizeBytes(eType)
            * GDALGetRasterCount(poSrcDS);

        if( dfLayerBytes > 2000000000.0 && sizeof(kdu_long) == 4 )
        {
            CPLError(CE_Warning, CPLE_AppDefined,
                     "Trimmming maximum size of file 2GB from %.1fGB\n"
                     "to avoid overflow of kdu_long layer size.",
                     dfLayerBytes / 1000000000.0);
            dfLayerBytes = 2000000000.0;
        }

        layer_bytes[layer_count - 1] = static_cast<kdu_long>(dfLayerBytes);

        CPLDebug("JP2KAK", "layer_bytes[] = %g\n",
                 static_cast<double>(layer_bytes[layer_count - 1]));
    }
    else
    {
        bReversible = true;
    }

    // Do we want to use more than one tile?
    int nTileXSize = nXSize;
    int nTileYSize = nYSize;

    if( nTileXSize > 25000 )
    {
        // Don't generate tiles that are terrible wide by default, as
        // they consume a lot of memory for the compression engine.
        nTileXSize = 20000;
    }

    // TODO(schwehr): Why 253 and not 255?
    if( (nTileYSize / TILE_CHUNK_SIZE) > 253)
    {
        // We don't want to process a tile in more than 255 chunks as there
        // is a limit on the number of tile parts in a tile and we are likely
        // to flush out a tile part for each processing chunk.  If we might
        // go over try trimming our Y tile size such that we will get about
        // 200 tile parts.
        nTileYSize = 200 * TILE_CHUNK_SIZE;
    }

    if( CSLFetchNameValue( papszOptions, "BLOCKXSIZE" ) != nullptr )
        nTileXSize = atoi(CSLFetchNameValue( papszOptions, "BLOCKXSIZE"));

    if( CSLFetchNameValue( papszOptions, "BLOCKYSIZE" ) != nullptr )
        nTileYSize = atoi(CSLFetchNameValue( papszOptions, "BLOCKYSIZE"));

    // Avoid splitting into too many tiles - apparently limiting to 64K tiles.
    // There is a hard limit on the number of tiles allowed in JPEG2000.
    const double dfXbyY = static_cast<double>(nXSize) * nYSize / (1024 * 64);
    while( dfXbyY >= static_cast<double>(nTileXSize) * nTileYSize )
    {
        nTileXSize *= 2;
        nTileYSize *= 2;
    }

    if( nTileXSize > nXSize ) nTileXSize = nXSize;
    if( nTileYSize > nYSize ) nTileYSize = nYSize;

    CPLDebug("JP2KAK", "Final JPEG2000 Tile Size is %dP x %dL.",
             nTileXSize, nTileYSize);

    // Do we want a comment segment emitted?
    const bool bComseg = CPLFetchBool(papszOptions, "COMSEG", true);

    // Work out the precision.
    int nBits = 0;

    if( CSLFetchNameValue( papszOptions, "NBITS" ) != nullptr )
        nBits = atoi(CSLFetchNameValue(papszOptions, "NBITS"));
    else if( poPrototypeBand->GetMetadataItem("NBITS", "IMAGE_STRUCTURE")
             != nullptr )
        nBits =
            atoi(poPrototypeBand->GetMetadataItem("NBITS", "IMAGE_STRUCTURE"));
    else
        nBits = GDALGetDataTypeSize(eType);

    // Establish the general image parameters.
    siz_params oSizeParams;

    oSizeParams.set(Scomponents, 0, 0, poSrcDS->GetRasterCount());
    oSizeParams.set(Sdims, 0, 0, nYSize);
    oSizeParams.set(Sdims, 0, 1, nXSize);
    oSizeParams.set(Sprecision, 0, 0, nBits);
    if( eType == GDT_UInt16 || eType == GDT_Byte )
        oSizeParams.set(Ssigned, 0, 0, false);
    else
        oSizeParams.set(Ssigned, 0, 0, true);

    if( nTileXSize != nXSize || nTileYSize != nYSize )
    {
        oSizeParams.set(Stiles, 0, 0, nTileYSize);
        oSizeParams.set(Stiles, 0, 1, nTileXSize);

        CPLDebug("JP2KAK", "Stiles=%d,%d", nTileYSize, nTileXSize);
    }

    kdu_params *poSizeRef = &oSizeParams;
    poSizeRef->finalize();

    // Open output file, and setup codestream.
    if( !pfnProgress( 0.0, nullptr, pProgressData ) )
        return nullptr;

    jp2_family_tgt family;
#ifdef KAKADU_JPX
    jpx_family_tgt jpx_family;
    jpx_target jpx_out;
    const bool bIsJPX = !EQUAL(CPLGetExtension(pszFilename), "jpf") &&
                        !EQUAL(CPLGetExtension(pszFilename), "jpc") &&
                        !EQUAL(CPLGetExtension(pszFilename), "j2k") &&
                        !(pszCodec != NULL && EQUAL(pszCodec, "J2K"));
#endif

    kdu_compressed_target *poOutputFile = nullptr;
    jp2_target jp2_out;
    const char* pszCodec = CSLFetchNameValueDef(papszOptions, "CODEC", nullptr);
    const bool bIsJP2 = (!EQUAL(CPLGetExtension(pszFilename), "jpc") &&
                         !EQUAL(CPLGetExtension(pszFilename), "j2k") &&
#ifdef KAKADU_JPX
                         !bIsJPX &&
#endif
                         !(pszCodec != nullptr && EQUAL(pszCodec, "J2K")) ) ||
                        (pszCodec != nullptr && EQUAL(pszCodec, "JP2"));
    kdu_codestream oCodeStream;

    vsil_target oVSILTarget;

    try
    {
        oVSILTarget.open(pszFilename, "w");

        if( bIsJP2 )
        {
            // family.open( pszFilename );
            family.open(&oVSILTarget);

            jp2_out.open(&family);
            poOutputFile = &jp2_out;
        }
#ifdef KAKADU_JPX
        else if( bIsJPX )
        {
            jpx_family.open(pszFilename);

            jpx_out.open(&jpx_family);
            jpx_out.add_codestream();
        }
#endif
        else
        {
            poOutputFile = &oVSILTarget;
        }

        oCodeStream.create(&oSizeParams, poOutputFile);
    }
    catch( ... )
    {
        return nullptr;
    }

    // Do we have a high res region of interest?
    kdu_roi_image *poROIImage = nullptr;
    char **papszROIDefs = CSLFetchNameValueMultiple(papszOptions, "ROI");

    for( int iROI = 0;
         papszROIDefs != nullptr && papszROIDefs[iROI] != nullptr;
         ++iROI )
    {
        char **papszTokens =
            CSLTokenizeStringComplex(papszROIDefs[iROI], ",", FALSE, FALSE);

        if( CSLCount(papszTokens) != 4 )
        {
            CPLError(CE_Warning, CPLE_AppDefined,
                     "Skipping corrupt ROI def = \n%s", papszROIDefs[iROI]);
            continue;
        }

        kdu_dims region;
        region.pos.x = atoi(papszTokens[0]);
        region.pos.y = atoi(papszTokens[1]);
        region.size.x = atoi(papszTokens[2]);
        region.size.y = atoi(papszTokens[3]);

        CSLDestroy(papszTokens);

        poROIImage = new kdu_roi_rect(oCodeStream, region);
    }
    CSLDestroy(papszROIDefs);

    // Set some particular parameters.
    oCodeStream.access_siz()->parse_string(
        CPLString().Printf("Clayers=%d", layer_count).c_str());
    oCodeStream.access_siz()->parse_string("Cycc=no");
    if( eType == GDT_Int16 || eType == GDT_UInt16 )
        oCodeStream.access_siz()->parse_string("Qstep=0.0000152588");

    if( bReversible )
        oCodeStream.access_siz()->parse_string("Creversible=yes");
    else
        oCodeStream.access_siz()->parse_string("Creversible=no");

    // Set some user-overridable parameters.
    const char * const apszParms[] =
        { "Corder", "PCRL",
          "Cprecincts",
          "{512,512},{256,512},{128,512},{64,512},{32,512},{16,512},{8,512},{4,512},{2,512}",
          "ORGgen_plt", "yes",
          "ORGgen_tlm", nullptr,
          "Qguard", nullptr,
          "Cmodes", nullptr,
          "Clevels", nullptr,
          "Cblk", nullptr,
          "Rshift", nullptr,
          "Rlevels", nullptr,
          "Rweight", nullptr,
          "Sprofile", nullptr,
          nullptr, nullptr };

    for( int iParm = 0; apszParms[iParm] != nullptr; iParm += 2 )
    {
        const char *pszValue =
            CSLFetchNameValue(papszOptions, apszParms[iParm]);

        if( pszValue == nullptr )
            pszValue = apszParms[iParm + 1];

        if( pszValue != nullptr )
        {
            CPLString osOpt;

            osOpt.Printf("%s=%s", apszParms[iParm], pszValue);
            try
            {
                oCodeStream.access_siz()->parse_string(osOpt);
            }
            catch( ... )
            {
                CPLFree(layer_bytes);
                if( bIsJP2 )
                {
                    jp2_out.close();
                    family.close();
                }
                else
                {
                    poOutputFile->close();
                }
                return nullptr;
            }

            CPLDebug("JP2KAK", "parse_string(%s)", osOpt.c_str());
        }
    }

    oCodeStream.access_siz()->finalize_all();

    // Some JP2 specific parameters.
    if( bIsJP2 )
    {
        // Set dimensional information.
        // All redundant with the SIZ marker segment.
        jp2_dimensions dims = jp2_out.access_dimensions();
        dims.init(&oSizeParams);

        // Set colour space information (mandatory).
        jp2_colour colour = jp2_out.access_colour();

        if( bHaveCT || poSrcDS->GetRasterCount() == 3 )
        {
            colour.init( JP2_sRGB_SPACE );
        }
        else if( poSrcDS->GetRasterCount() >= 4
                 && poSrcDS->GetRasterBand(4)->GetColorInterpretation()
                 == GCI_AlphaBand )
        {
            colour.init(JP2_sRGB_SPACE);
            jp2_out.access_channels().init(3);
            jp2_out.access_channels().set_colour_mapping(0, 0);
            jp2_out.access_channels().set_colour_mapping(1, 1);
            jp2_out.access_channels().set_colour_mapping(2, 2);
            jp2_out.access_channels().set_opacity_mapping(0, 3);
            jp2_out.access_channels().set_opacity_mapping(1, 3);
            jp2_out.access_channels().set_opacity_mapping(2, 3);
        }
        else if( poSrcDS->GetRasterCount() >= 2
                 && poSrcDS->GetRasterBand(2)->GetColorInterpretation()
                 == GCI_AlphaBand )
        {
            colour.init(JP2_sLUM_SPACE);
            jp2_out.access_channels().init(1);
            jp2_out.access_channels().set_colour_mapping(0, 0);
            jp2_out.access_channels().set_opacity_mapping(0, 1);
        }
        else
        {
            colour.init( JP2_sLUM_SPACE );
        }

        // Resolution.
        if( poSrcDS->GetMetadataItem("TIFFTAG_XRESOLUTION") != nullptr
            && poSrcDS->GetMetadataItem("TIFFTAG_YRESOLUTION") != nullptr
            && poSrcDS->GetMetadataItem("TIFFTAG_RESOLUTIONUNIT") != nullptr )
        {
            jp2_resolution res = jp2_out.access_resolution();
            double dfXRes =
                CPLAtof(poSrcDS->GetMetadataItem("TIFFTAG_XRESOLUTION"));
            double dfYRes =
                CPLAtof(poSrcDS->GetMetadataItem("TIFFTAG_YRESOLUTION"));

            if( atoi(poSrcDS->GetMetadataItem("TIFFTAG_RESOLUTIONUNIT")) == 2 )
            {
                // Convert pixels per inch to pixels per cm.
                // TODO(schwehr): Change this to 1.0 / 2.54 if correct.
                const double dfInchToCm = 39.37 / 100.0;
                dfXRes *= dfInchToCm;
                dfYRes *= dfInchToCm;
            }

            // Convert to pixels per meter.
            dfXRes *= 100.0;
            dfYRes *= 100.0;

            if( dfXRes != 0.0 && dfYRes != 0.0 )
            {
                if( fabs(dfXRes / dfYRes - 1.0) > 0.00001 )
                    res.init(static_cast<float>(dfYRes / dfXRes));
                else
                    res.init(1.0);
                res.set_resolution(static_cast<float>(dfXRes), true);
            }
        }
    }

    // Write JP2 pseudocolor table if available.
    if( bIsJP2 && bHaveCT )
    {
        GDALColorTable *const poCT = poPrototypeBand->GetColorTable();
        const int nCount = poCT->GetColorEntryCount();
        kdu_int32 *panLUT =
            static_cast<kdu_int32 *>(CPLMalloc(sizeof(kdu_int32) * nCount * 3));

        jp2_palette oJP2Palette = jp2_out.access_palette();
        oJP2Palette.init(3, nCount);

        for( int iColor = 0; iColor < nCount; iColor++ )
        {
            GDALColorEntry sEntry = { 0, 0, 0, 0 };

            poCT->GetColorEntryAsRGB(iColor, &sEntry);
            panLUT[iColor + nCount * 0] = sEntry.c1;
            panLUT[iColor + nCount * 1] = sEntry.c2;
            panLUT[iColor + nCount * 2] = sEntry.c3;
        }

        oJP2Palette.set_lut(0, panLUT + nCount * 0, 8, false);
        oJP2Palette.set_lut(1, panLUT + nCount * 1, 8, false);
        oJP2Palette.set_lut(2, panLUT + nCount * 2, 8, false);

        CPLFree(panLUT);

        jp2_channels oJP2Channels = jp2_out.access_channels();

        oJP2Channels.init(3);
        oJP2Channels.set_colour_mapping(0, 0, 0);
        oJP2Channels.set_colour_mapping(1, 0, 1);
        oJP2Channels.set_colour_mapping(2, 0, 2);
    }

    if( bIsJP2 )
    {
        try
        {
            jp2_out.write_header();
        }
        catch( ... )
        {
            CPLDebug("JP2KAK", "jp2_out.write_header() - caught exception.");
            oCodeStream.destroy();
            CPLFree(layer_bytes);
            return nullptr;
        }
    }

    // Set the GeoTIFF and GML boxes if georeferencing is available,
    // and this is a JP2 file.
    double adfGeoTransform[6] = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
    if( bIsJP2
        && ((poSrcDS->GetGeoTransform(adfGeoTransform) == CE_None
             && (adfGeoTransform[0] != 0.0
                 || adfGeoTransform[1] != 1.0
                 || adfGeoTransform[2] != 0.0
                 || adfGeoTransform[3] != 0.0
                 || adfGeoTransform[4] != 0.0
                 || std::abs(adfGeoTransform[5]) != 1.0))
            || poSrcDS->GetGCPCount() > 0
            || poSrcDS->GetMetadata("RPC") != nullptr) )
    {
        GDALJP2Metadata oJP2MD;

        if( poSrcDS->GetGCPCount() > 0 )
        {
            oJP2MD.SetProjection(poSrcDS->GetGCPProjection());
            oJP2MD.SetGCPs(poSrcDS->GetGCPCount(), poSrcDS->GetGCPs());
        }
        else
        {
            oJP2MD.SetProjection(poSrcDS->GetProjectionRef());
            oJP2MD.SetGeoTransform(adfGeoTransform);
        }

        oJP2MD.SetRPCMD(poSrcDS->GetMetadata("RPC"));

        const char *const pszAreaOrPoint =
            poSrcDS->GetMetadataItem(GDALMD_AREA_OR_POINT);
        oJP2MD.bPixelIsPoint =
            pszAreaOrPoint != nullptr && EQUAL(pszAreaOrPoint, GDALMD_AOP_POINT);

        if( CPLFetchBool(papszOptions, "GMLJP2", true) )
        {
            const char *pszGMLJP2V2Def =
                CSLFetchNameValue(papszOptions, "GMLJP2V2_DEF");
            GDALJP2Box* poBox;
            if( pszGMLJP2V2Def != nullptr ) {
                poBox = oJP2MD.CreateGMLJP2V2(
                    nXSize,nYSize,pszGMLJP2V2Def,poSrcDS);
            } else {
                poBox = oJP2MD.CreateGMLJP2(nXSize, nYSize);
            }
            try
            {
                JP2KAKWriteBox(&family, poBox);
            }
            catch( ... )
            {
                CPLDebug("JP2KAK", "JP2KAKWriteBox) - caught exception.");
                oCodeStream.destroy();
                CPLFree(layer_bytes);
                delete poBox;
                return nullptr;
            }
        }
        if( CPLFetchBool(papszOptions, "GeoJP2", true) ) {
            GDALJP2Box* poBox = oJP2MD.CreateJP2GeoTIFF();
            try
            {
                JP2KAKWriteBox(&family, poBox);
            }
            catch( ... )
            {
                CPLDebug("JP2KAK", "JP2KAKWriteBox) - caught exception.");
                oCodeStream.destroy();
                CPLFree(layer_bytes);
                delete poBox;
                return nullptr;
            }
        }
    }

    // Do we have any XML boxes we want to preserve?

    for( int iBox = 0; true; iBox++ )
    {
        CPLString oName;
        oName.Printf("xml:BOX_%d", iBox);
        char **papszMD = poSrcDS->GetMetadata(oName);

        if( papszMD == nullptr || CSLCount(papszMD) != 1 )
            break;

        GDALJP2Box *poXMLBox = new GDALJP2Box();

        poXMLBox->SetType("xml ");
        poXMLBox->SetWritableData(static_cast<int>(strlen(papszMD[0]) + 1),
                                  reinterpret_cast<GByte *>(papszMD[0]));
        JP2KAKWriteBox(&family, poXMLBox);
    }

    // Open codestream box.
    if( bIsJP2 )
        jp2_out.open_codestream();

    // Create one big tile, and a compressing engine, and line
    // buffer for each component.
    double dfPixelsDone = 0.0;
    const double dfPixelsTotal = nXSize * static_cast<double>(nYSize);
    const bool bFlushEnabled = CPLFetchBool(papszOptions, "FLUSH", true);

    for( int iTileYOff = 0; iTileYOff < nYSize; iTileYOff += nTileYSize )
    {
        for( int iTileXOff = 0; iTileXOff < nXSize; iTileXOff += nTileXSize )
        {
            kdu_tile oTile = oCodeStream.open_tile(
                kdu_coords(iTileXOff / nTileXSize, iTileYOff / nTileYSize));

            // Is this a partial tile on the right or bottom?
            const int nThisTileXSize =
                iTileXOff + nTileXSize < nXSize
                ? nTileXSize
                : nXSize - iTileXOff;

            const int nThisTileYSize =
                iTileYOff + nTileYSize < nYSize
                ? nTileYSize
                : nYSize - iTileYOff;

            // Setup scaled progress monitor.

            const double dfPixelsDoneAfter =
                dfPixelsDone + static_cast<double>(nThisTileXSize) * nThisTileYSize;

            void *pScaledProgressData = GDALCreateScaledProgress(
                dfPixelsDone / dfPixelsTotal, dfPixelsDoneAfter / dfPixelsTotal,
                pfnProgress, pProgressData);

            if( !JP2KAKCreateCopy_WriteTile(poSrcDS, oTile, poROIImage,
                                            iTileXOff, iTileYOff,
                                            nThisTileXSize, nThisTileYSize,
                                            bReversible, nBits, eType,
                                            oCodeStream, bFlushEnabled,
                                            layer_bytes, layer_count,
                                            GDALScaledProgress,
                                            pScaledProgressData, bComseg) )
            {
                GDALDestroyScaledProgress(pScaledProgressData);

                oCodeStream.destroy();
                poOutputFile->close();
                VSIUnlink(pszFilename);
                return nullptr;
            }

            GDALDestroyScaledProgress(pScaledProgressData);
            dfPixelsDone = dfPixelsDoneAfter;

            oTile.close();
        }
    }

    // Finish flushing out results.
    oCodeStream.flush(layer_bytes, layer_count, nullptr, true, bComseg);
    oCodeStream.destroy();

    CPLFree(layer_bytes);

    if( bIsJP2 )
    {
        jp2_out.close();
        family.close();
    }
    else
    {
        poOutputFile->close();
    }

    oVSILTarget.close();

    if( !pfnProgress(1.0, nullptr, pProgressData) )
        return nullptr;

    // Re-open dataset, and copy any auxiliary pam information.
    GDALOpenInfo oOpenInfo(pszFilename, GA_ReadOnly);
    GDALPamDataset *poDS =
        static_cast<GDALPamDataset *>(JP2KAKDataset::Open(&oOpenInfo));

    if( poDS )
        poDS->CloneInfo(poSrcDS, GCIF_PAM_DEFAULT);

    return poDS;
}

/************************************************************************/
/*                        GDALRegister_JP2KAK()                         */
/************************************************************************/

void GDALRegister_JP2KAK()

{
    if( !GDAL_CHECK_VERSION("JP2KAK driver") )
        return;

    if( GDALGetDriverByName("JP2KAK") != nullptr )
        return;

    GDALDriver *poDriver = new GDALDriver();

    poDriver->SetDescription("JP2KAK");
    poDriver->SetMetadataItem(GDAL_DCAP_RASTER, "YES");
    poDriver->SetMetadataItem(GDAL_DCAP_VECTOR, "YES");
    poDriver->SetMetadataItem(
        GDAL_DMD_LONGNAME, "JPEG-2000 (based on Kakadu " KDU_CORE_VERSION ")");
    poDriver->SetMetadataItem(GDAL_DMD_HELPTOPIC, "frmt_jp2kak.html");
    poDriver->SetMetadataItem(GDAL_DMD_CREATIONDATATYPES, "Byte Int16 UInt16");
    poDriver->SetMetadataItem(GDAL_DMD_MIMETYPE, "image/jp2");
    poDriver->SetMetadataItem(GDAL_DMD_EXTENSION, "jp2 j2k");
    poDriver->SetMetadataItem(GDAL_DCAP_VIRTUALIO, "YES");

    poDriver->SetMetadataItem(GDAL_DMD_OPENOPTIONLIST,
"<OpenOptionList>"
"   <Option name='1BIT_ALPHA_PROMOTION' type='boolean' description="
"'Whether a 1-bit alpha channel should be promoted to 8-bit' default='YES'/>"
"   <Option name='OPEN_REMOTE_GML' type='boolean' description="
"'Whether to load remote vector layers referenced by "
"a link in a GMLJP2 v2 box' default='NO'/>"
"   <Option name='GEOREF_SOURCES' type='string' description="
"'Comma separated list made with values "
"INTERNAL/GMLJP2/GEOJP2/WORLDFILE/PAM/NONE that describe the priority order "
"for georeferencing' default='PAM,GEOJP2,GMLJP2,WORLDFILE'/>"
"</OpenOptionList>" );

    poDriver->SetMetadataItem(GDAL_DMD_CREATIONOPTIONLIST,
"<CreationOptionList>"
"   <Option name='CODEC' type='string-select' "
    "default='according to file extension. If unknown, default to JP2'>"
"       <Value>JP2</Value>"
"       <Value>J2K</Value>"
"   </Option>"
"   <Option name='QUALITY' type='integer' description="
"'0.01-100, 100 is lossless'/>"
"   <Option name='BLOCKXSIZE' type='int' description='Tile Width'/>"
"   <Option name='BLOCKYSIZE' type='int' description='Tile Height'/>"
"   <Option name='GeoJP2' type='boolean' description='defaults to ON'/>"
"   <Option name='GMLJP2' type='boolean' description='defaults to ON'/>"
"   <Option name='GMLJP2V2_DEF' type='string' description="
"'Definition file to describe how a GMLJP2 v2 box should be generated. "
"If set to YES, a minimal instance will be created'/>"
"   <Option name='LAYERS' type='integer'/>"
"   <Option name='ROI' type='string'/>"
"   <Option name='COMSEG' type='boolean' />"
"   <Option name='FLUSH' type='boolean' />"
"   <Option name='NBITS' type='int' description="
"'BITS (precision) for sub-byte files (1-7), sub-uint16 (9-15)'/>"
"   <Option name='Corder' type='string'/>"
"   <Option name='Cprecincts' type='string'/>"
"   <Option name='Cmodes' type='string'/>"
"   <Option name='Clevels' type='string'/>"
"   <Option name='ORGgen_plt' type='string'/>"
"   <Option name='ORGgen_tlm' type='string'/>"
"   <Option name='Qguard' type='integer'/>"
"   <Option name='Sprofile' type='string'/>"
"   <Option name='Rshift' type='string'/>"
"   <Option name='Rlevels' type='string'/>"
"   <Option name='Rweight' type='string'/>"
"</CreationOptionList>" );

    poDriver->pfnOpen = JP2KAKDataset::Open;
    poDriver->pfnIdentify = JP2KAKDataset::Identify;
    poDriver->pfnCreateCopy = JP2KAKCreateCopy;

    GetGDALDriverManager()->RegisterDriver(poDriver);
}
