/******************************************************************************
 *
 * Project:  ODS Translator
 * Purpose:  Implements OGRODSDataSource class
 * Author:   Even Rouault, even dot rouault at spatialys.com
 *
 ******************************************************************************
 * Copyright (c) 2012, Even Rouault <even dot rouault at spatialys.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#include "ogr_ods.h"
#include "ogr_mem.h"
#include "ogr_p.h"
#include "cpl_conv.h"
#include "cpl_vsi_error.h"
#include "ods_formula.h"

#include <algorithm>
#include <set>

namespace OGRODS
{

/************************************************************************/
/*                          ODSCellEvaluator                            */
/************************************************************************/

class ODSCellEvaluator : public IODSCellEvaluator
{
  private:
    OGRODSLayer *poLayer;
    std::set<std::pair<int, int>> oVisisitedCells;

  public:
    explicit ODSCellEvaluator(OGRODSLayer *poLayerIn) : poLayer(poLayerIn)
    {
    }

    int EvaluateRange(int nRow1, int nCol1, int nRow2, int nCol2,
                      std::vector<ods_formula_node> &aoOutValues) override;

    int Evaluate(int nRow, int nCol);
};

/************************************************************************/
/*                            OGRODSLayer()                             */
/************************************************************************/

OGRODSLayer::OGRODSLayer(OGRODSDataSource *poDSIn, const char *pszName,
                         bool bUpdatedIn)
    : OGRMemLayer(pszName, nullptr, wkbNone), poDS(poDSIn),
      bUpdated(CPL_TO_BOOL(bUpdatedIn)), bHasHeaderLine(false),
      m_poAttrQueryODS(nullptr)
{
}

/************************************************************************/
/*                            ~OGRODSLayer()                            */
/************************************************************************/

OGRODSLayer::~OGRODSLayer()
{
    delete m_poAttrQueryODS;
}

/************************************************************************/
/*                             Updated()                                */
/************************************************************************/

void OGRODSLayer::SetUpdated(bool bUpdatedIn)
{
    if (bUpdatedIn && !bUpdated && poDS->GetUpdatable())
    {
        bUpdated = true;
        poDS->SetUpdated();
    }
    else if (bUpdated && !bUpdatedIn)
    {
        bUpdated = false;
    }
}

/************************************************************************/
/*                           SyncToDisk()                               */
/************************************************************************/

OGRErr OGRODSLayer::SyncToDisk()
{
    poDS->FlushCache(false);
    return OGRERR_NONE;
}

/************************************************************************/
/*                          GetNextFeature()                            */
/************************************************************************/

OGRFeature *OGRODSLayer::GetNextFeature()
{
    while (true)
    {
        OGRFeature *poFeature = OGRMemLayer::GetNextFeature();
        if (poFeature == nullptr)
            return nullptr;
        poFeature->SetFID(poFeature->GetFID() + 1 + (bHasHeaderLine ? 1 : 0));
        if (m_poAttrQueryODS == nullptr ||
            m_poAttrQueryODS->Evaluate(poFeature))
        {
            return poFeature;
        }
        delete poFeature;
    }
}

/************************************************************************/
/*                           GetFeature()                               */
/************************************************************************/

OGRFeature *OGRODSLayer::GetFeature(GIntBig nFeatureId)
{
    OGRFeature *poFeature =
        OGRMemLayer::GetFeature(nFeatureId - (1 + (bHasHeaderLine ? 1 : 0)));
    if (poFeature)
        poFeature->SetFID(nFeatureId);
    return poFeature;
}

/************************************************************************/
/*                          GetFeatureCount()                           */
/************************************************************************/

GIntBig OGRODSLayer::GetFeatureCount(int bForce)
{
    if (m_poAttrQueryODS == nullptr)
        return OGRMemLayer::GetFeatureCount(bForce);
    return OGRLayer::GetFeatureCount(bForce);
}

/************************************************************************/
/*                           ISetFeature()                               */
/************************************************************************/

OGRErr OGRODSLayer::ISetFeature(OGRFeature *poFeature)
{
    if (poFeature == nullptr)
        return OGRMemLayer::ISetFeature(poFeature);

    GIntBig nFID = poFeature->GetFID();
    if (nFID != OGRNullFID)
        poFeature->SetFID(nFID - (1 + (bHasHeaderLine ? 1 : 0)));
    SetUpdated();
    OGRErr eErr = OGRMemLayer::ISetFeature(poFeature);
    poFeature->SetFID(nFID);
    return eErr;
}

/************************************************************************/
/*                          DeleteFeature()                             */
/************************************************************************/

OGRErr OGRODSLayer::DeleteFeature(GIntBig nFID)
{
    SetUpdated();
    return OGRMemLayer::DeleteFeature(nFID - (1 + (bHasHeaderLine ? 1 : 0)));
}

/************************************************************************/
/*                         SetAttributeFilter()                         */
/************************************************************************/

OGRErr OGRODSLayer::SetAttributeFilter(const char *pszQuery)

{
    // Intercept attribute filter since we mess up with FIDs
    OGRErr eErr = OGRLayer::SetAttributeFilter(pszQuery);
    delete m_poAttrQueryODS;
    m_poAttrQueryODS = m_poAttrQuery;
    m_poAttrQuery = nullptr;
    return eErr;
}

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

int OGRODSLayer::TestCapability(const char *pszCap)

{
    if (EQUAL(pszCap, OLCFastFeatureCount))
        return m_poFilterGeom == nullptr && m_poAttrQueryODS == nullptr;
    return OGRMemLayer::TestCapability(pszCap);
}

/************************************************************************/
/*                          OGRODSDataSource()                          */
/************************************************************************/

OGRODSDataSource::OGRODSDataSource()
    : pszName(nullptr), bUpdatable(false), bUpdated(false),
      bAnalysedFile(false), nLayers(0), papoLayers(nullptr),
      fpSettings(nullptr), nVerticalSplitFlags(0), fpContent(nullptr),
      bFirstLineIsHeaders(false),
      bAutodetectTypes(
          !EQUAL(CPLGetConfigOption("OGR_ODS_FIELD_TYPES", ""), "STRING")),
      oParser(nullptr), bStopParsing(false), nWithoutEventCounter(0),
      nDataHandlerCounter(0), nCurLine(0), nEmptyRowsAccumulated(0),
      nRowsRepeated(1), nCurCol(0), nCellsRepeated(0), bEndTableParsing(false),
      poCurLayer(nullptr), nStackDepth(0), nDepth(0)
{
    stateStack[0].eVal = STATE_DEFAULT;
    stateStack[0].nBeginDepth = 0;
}

/************************************************************************/
/*                         ~OGRODSDataSource()                          */
/************************************************************************/

OGRODSDataSource::~OGRODSDataSource()

{
    OGRODSDataSource::FlushCache(true);

    CPLFree(pszName);

    if (fpContent)
        VSIFCloseL(fpContent);
    if (fpSettings)
        VSIFCloseL(fpSettings);

    for (int i = 0; i < nLayers; i++)
        delete papoLayers[i];
    CPLFree(papoLayers);
}

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

int OGRODSDataSource::TestCapability(const char *pszCap)

{
    if (EQUAL(pszCap, ODsCCreateLayer))
        return bUpdatable;
    else if (EQUAL(pszCap, ODsCDeleteLayer))
        return bUpdatable;
    else if (EQUAL(pszCap, ODsCRandomLayerWrite))
        return bUpdatable;
    else if (EQUAL(pszCap, ODsCMeasuredGeometries))
        return true;
    else if (EQUAL(pszCap, ODsCZGeometries))
        return true;
    else if (EQUAL(pszCap, ODsCCurveGeometries))
        return true;
    else
        return false;
}

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

OGRLayer *OGRODSDataSource::GetLayer(int iLayer)

{
    AnalyseFile();
    if (iLayer < 0 || iLayer >= nLayers)
        return nullptr;

    return papoLayers[iLayer];
}

/************************************************************************/
/*                            GetLayerCount()                           */
/************************************************************************/

int OGRODSDataSource::GetLayerCount()
{
    AnalyseFile();
    return nLayers;
}

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

int OGRODSDataSource::Open(const char *pszFilename, VSILFILE *fpContentIn,
                           VSILFILE *fpSettingsIn, int bUpdatableIn)

{
    SetDescription(pszFilename);
    bUpdatable = CPL_TO_BOOL(bUpdatableIn);

    pszName = CPLStrdup(pszFilename);
    fpContent = fpContentIn;
    fpSettings = fpSettingsIn;

    return TRUE;
}

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

int OGRODSDataSource::Create(const char *pszFilename,
                             char ** /* papszOptions */)
{
    bUpdated = true;
    bUpdatable = true;
    bAnalysedFile = true;

    pszName = CPLStrdup(pszFilename);

    return TRUE;
}

/************************************************************************/
/*                           startElementCbk()                          */
/************************************************************************/

static void XMLCALL startElementCbk(void *pUserData, const char *pszName,
                                    const char **ppszAttr)
{
    static_cast<OGRODSDataSource *>(pUserData)->startElementCbk(pszName,
                                                                ppszAttr);
}

void OGRODSDataSource::startElementCbk(const char *pszNameIn,
                                       const char **ppszAttr)
{
    if (bStopParsing)
        return;

    nWithoutEventCounter = 0;
    switch (stateStack[nStackDepth].eVal)
    {
        case STATE_DEFAULT:
            startElementDefault(pszNameIn, ppszAttr);
            break;
        case STATE_TABLE:
            startElementTable(pszNameIn, ppszAttr);
            break;
        case STATE_ROW:
            startElementRow(pszNameIn, ppszAttr);
            break;
        case STATE_CELL:
            startElementCell(pszNameIn, ppszAttr);
            break;
        case STATE_TEXTP:
            break;
        default:
            break;
    }
    nDepth++;
}

/************************************************************************/
/*                            endElementCbk()                           */
/************************************************************************/

static void XMLCALL endElementCbk(void *pUserData, const char *pszName)
{
    static_cast<OGRODSDataSource *>(pUserData)->endElementCbk(pszName);
}

void OGRODSDataSource::endElementCbk(const char *pszNameIn)
{
    if (bStopParsing)
        return;

    nWithoutEventCounter = 0;

    nDepth--;
    switch (stateStack[nStackDepth].eVal)
    {
        case STATE_DEFAULT:
            break;
        case STATE_TABLE:
            endElementTable(pszNameIn);
            break;
        case STATE_ROW:
            endElementRow(pszNameIn);
            break;
        case STATE_CELL:
            endElementCell(pszNameIn);
            break;
        case STATE_TEXTP:
            break;
        default:
            break;
    }

    if (stateStack[nStackDepth].nBeginDepth == nDepth)
        nStackDepth--;
}

/************************************************************************/
/*                            dataHandlerCbk()                          */
/************************************************************************/

static void XMLCALL dataHandlerCbk(void *pUserData, const char *data, int nLen)
{
    static_cast<OGRODSDataSource *>(pUserData)->dataHandlerCbk(data, nLen);
}

void OGRODSDataSource::dataHandlerCbk(const char *data, int nLen)
{
    if (bStopParsing)
        return;

    nDataHandlerCounter++;
    if (nDataHandlerCounter >= BUFSIZ)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "File probably corrupted (million laugh pattern)");
        XML_StopParser(oParser, XML_FALSE);
        bStopParsing = true;
        return;
    }

    nWithoutEventCounter = 0;

    switch (stateStack[nStackDepth].eVal)
    {
        case STATE_DEFAULT:
            break;
        case STATE_TABLE:
            break;
        case STATE_ROW:
            break;
        case STATE_CELL:
            break;
        case STATE_TEXTP:
            dataHandlerTextP(data, nLen);
            break;
        default:
            break;
    }
}

/************************************************************************/
/*                                PushState()                           */
/************************************************************************/

void OGRODSDataSource::PushState(HandlerStateEnum eVal)
{
    if (nStackDepth + 1 == STACK_SIZE)
    {
        bStopParsing = true;
        return;
    }
    nStackDepth++;
    stateStack[nStackDepth].eVal = eVal;
    stateStack[nStackDepth].nBeginDepth = nDepth;
}

/************************************************************************/
/*                          GetAttributeValue()                         */
/************************************************************************/

static const char *GetAttributeValue(const char **ppszAttr, const char *pszKey,
                                     const char *pszDefaultVal)
{
    while (*ppszAttr)
    {
        if (strcmp(ppszAttr[0], pszKey) == 0)
            return ppszAttr[1];
        ppszAttr += 2;
    }
    return pszDefaultVal;
}

/************************************************************************/
/*                            GetOGRFieldType()                         */
/************************************************************************/

OGRFieldType OGRODSDataSource::GetOGRFieldType(const char *pszValue,
                                               const char *pszValueType,
                                               OGRFieldSubType &eSubType)
{
    eSubType = OFSTNone;
    if (!bAutodetectTypes || pszValueType == nullptr)
        return OFTString;
    else if (strcmp(pszValueType, "string") == 0)
        return OFTString;
    else if (strcmp(pszValueType, "float") == 0 ||
             strcmp(pszValueType, "currency") == 0)
    {
        if (CPLGetValueType(pszValue) == CPL_VALUE_INTEGER)
        {
            GIntBig nVal = CPLAtoGIntBig(pszValue);
            if (!CPL_INT64_FITS_ON_INT32(nVal))
                return OFTInteger64;
            else
                return OFTInteger;
        }
        else
            return OFTReal;
    }
    else if (strcmp(pszValueType, "percentage") == 0)
        return OFTReal;
    else if (strcmp(pszValueType, "date") == 0)
    {
        if (strlen(pszValue) == 4 + 1 + 2 + 1 + 2)
            return OFTDate;
        else
            return OFTDateTime;
    }
    else if (strcmp(pszValueType, "time") == 0)
    {
        return OFTTime;
    }
    else if (strcmp(pszValueType, "bool") == 0)
    {
        eSubType = OFSTBoolean;
        return OFTInteger;
    }
    else
        return OFTString;
}

/************************************************************************/
/*                              SetField()                              */
/************************************************************************/

static void SetField(OGRFeature *poFeature, int i, const char *pszValue)
{
    if (pszValue[0] == '\0')
        return;

    OGRFieldType eType = poFeature->GetFieldDefnRef(i)->GetType();
    if (eType == OFTTime)
    {
        int nHour, nHourRepeated, nMinute, nSecond;
        char c = '\0';
        if (STARTS_WITH(pszValue, "PT") &&
            sscanf(pszValue + 2, "%02d%c%02d%c%02d%c", &nHour, &c, &nMinute, &c,
                   &nSecond, &c) == 6)
        {
            poFeature->SetField(i, 0, 0, 0, nHour, nMinute,
                                static_cast<float>(nSecond), 0);
        }
        /* bug with kspread 2.1.2 ? */
        /* ex PT121234M56S */
        else if (STARTS_WITH(pszValue, "PT") &&
                 sscanf(pszValue + 2, "%02d%02d%02d%c%02d%c", &nHour,
                        &nHourRepeated, &nMinute, &c, &nSecond, &c) == 6 &&
                 nHour == nHourRepeated)
        {
            poFeature->SetField(i, 0, 0, 0, nHour, nMinute,
                                static_cast<float>(nSecond), 0);
        }
    }
    else if (eType == OFTDate || eType == OFTDateTime)
    {
        OGRField sField;
        if (OGRParseXMLDateTime(pszValue, &sField))
        {
            poFeature->SetField(i, &sField);
        }
    }
    else
        poFeature->SetField(i, pszValue);
}

/************************************************************************/
/*                          DetectHeaderLine()                          */
/************************************************************************/

void OGRODSDataSource::DetectHeaderLine()

{
    bool bHeaderLineCandidate = true;

    for (size_t i = 0; i < apoFirstLineTypes.size(); i++)
    {
        if (apoFirstLineTypes[i] != "string")
        {
            /* If the values in the first line are not text, then it is */
            /* not a header line */
            bHeaderLineCandidate = false;
            break;
        }
    }

    size_t nCountTextOnCurLine = 0;
    size_t nCountNonEmptyOnCurLine = 0;
    for (size_t i = 0; bHeaderLineCandidate && i < apoCurLineTypes.size(); i++)
    {
        if (apoCurLineTypes[i] == "string")
        {
            /* If there are only text values on the second line, then we cannot
             */
            /* know if it is a header line or just a regular line */
            nCountTextOnCurLine++;
        }
        else if (apoCurLineTypes[i] != "")
        {
            nCountNonEmptyOnCurLine++;
        }
    }

    const char *pszODSHeaders = CPLGetConfigOption("OGR_ODS_HEADERS", "");
    bFirstLineIsHeaders = false;
    if (EQUAL(pszODSHeaders, "FORCE"))
        bFirstLineIsHeaders = true;
    else if (EQUAL(pszODSHeaders, "DISABLE"))
        bFirstLineIsHeaders = false;
    else if (osSetLayerHasSplitter.find(poCurLayer->GetName()) !=
             osSetLayerHasSplitter.end())
    {
        bFirstLineIsHeaders = true;
    }
    else if (bHeaderLineCandidate && !apoFirstLineTypes.empty() &&
             apoFirstLineTypes.size() == apoCurLineTypes.size() &&
             nCountTextOnCurLine != apoFirstLineTypes.size() &&
             nCountNonEmptyOnCurLine != 0)
    {
        bFirstLineIsHeaders = true;
    }
    CPLDebug("ODS", "%s %s", poCurLayer->GetName(),
             bFirstLineIsHeaders ? "has header line" : "has no header line");
}

/************************************************************************/
/*                          startElementDefault()                       */
/************************************************************************/

void OGRODSDataSource::startElementDefault(const char *pszNameIn,
                                           const char **ppszAttr)
{
    if (strcmp(pszNameIn, "table:table") == 0)
    {
        const char *pszTableName =
            GetAttributeValue(ppszAttr, "table:name", "unnamed");

        poCurLayer = new OGRODSLayer(this, pszTableName);
        papoLayers = (OGRLayer **)CPLRealloc(
            papoLayers, (nLayers + 1) * sizeof(OGRLayer *));
        papoLayers[nLayers++] = poCurLayer;

        nCurLine = 0;
        nEmptyRowsAccumulated = 0;
        apoFirstLineValues.resize(0);
        apoFirstLineTypes.resize(0);
        PushState(STATE_TABLE);
        bEndTableParsing = false;
    }
}

/************************************************************************/
/*                          startElementTable()                        */
/************************************************************************/

void OGRODSDataSource::startElementTable(const char *pszNameIn,
                                         const char **ppszAttr)
{
    if (strcmp(pszNameIn, "table:table-row") == 0 && !bEndTableParsing)
    {
        nRowsRepeated = atoi(
            GetAttributeValue(ppszAttr, "table:number-rows-repeated", "1"));
        if (static_cast<GIntBig>(nCurLine) + nRowsRepeated + 2 >= 1048576)
        {
            // Typical of a XLSX converted to ODS
            bEndTableParsing = true;
            return;
        }
        if (nRowsRepeated <= 0 || nRowsRepeated > 10000)
        {
            CPLError(CE_Failure, CPLE_NotSupported,
                     "Invalid value for number-rows-repeated = %d",
                     nRowsRepeated);
            bEndTableParsing = true;
            nRowsRepeated = 1;
            return;
        }
        const int nFields = std::max(
            static_cast<int>(apoFirstLineValues.size()),
            poCurLayer != nullptr ? poCurLayer->GetLayerDefn()->GetFieldCount()
                                  : 0);
        if (nFields > 0 && nRowsRepeated > 100000 / nFields)
        {
            CPLError(CE_Failure, CPLE_AppDefined,
                     "Too big gap with previous valid row");
            bEndTableParsing = true;
            return;
        }

        nCurCol = 0;

        apoCurLineValues.resize(0);
        apoCurLineTypes.resize(0);

        PushState(STATE_ROW);
    }
}

/************************************************************************/
/*                      ReserveAndLimitFieldCount()                     */
/************************************************************************/

static void ReserveAndLimitFieldCount(OGRLayer *poLayer,
                                      std::vector<std::string> &aosValues)
{
    int nMaxCols = atoi(CPLGetConfigOption("OGR_ODS_MAX_FIELD_COUNT", "2000"));
    // Arbitrary limit to please Coverity Scan that would complain about
    // tainted_data to resize aosValues.
    constexpr int MAXCOLS_LIMIT = 1000000;
    if (nMaxCols > MAXCOLS_LIMIT)
        nMaxCols = MAXCOLS_LIMIT;
    if (static_cast<int>(aosValues.size()) > nMaxCols)
    {
        CPLError(CE_Warning, CPLE_AppDefined,
                 "%d columns detected. Limiting to %d. "
                 "Set OGR_ODS_MAX_FIELD_COUNT configuration option "
                 "to allow more fields.",
                 static_cast<int>(aosValues.size()), nMaxCols);
        // coverity[tainted_data]
        aosValues.resize(nMaxCols);
    }

    poLayer->GetLayerDefn()->ReserveSpaceForFields(
        static_cast<int>(aosValues.size()));
}

/************************************************************************/
/*                           endElementTable()                          */
/************************************************************************/

void OGRODSDataSource::endElementTable(
    CPL_UNUSED /* in non-DEBUG*/ const char *pszNameIn)
{
    if (stateStack[nStackDepth].nBeginDepth == nDepth)
    {
        // Only use of pszNameIn.
        CPLAssert(strcmp(pszNameIn, "table:table") == 0);

        if (nCurLine == 0 || (nCurLine == 1 && apoFirstLineValues.empty()))
        {
            /* Remove empty sheet */
            delete poCurLayer;
            nLayers--;
            poCurLayer = nullptr;
        }
        else if (nCurLine == 1)
        {
            /* If we have only one single line in the sheet */

            ReserveAndLimitFieldCount(poCurLayer, apoFirstLineValues);

            for (size_t i = 0; i < apoFirstLineValues.size(); i++)
            {
                const char *pszFieldName = CPLSPrintf("Field%d", (int)i + 1);
                OGRFieldSubType eSubType = OFSTNone;
                OGRFieldType eType =
                    GetOGRFieldType(apoFirstLineValues[i].c_str(),
                                    apoFirstLineTypes[i].c_str(), eSubType);
                OGRFieldDefn oFieldDefn(pszFieldName, eType);
                oFieldDefn.SetSubType(eSubType);
                poCurLayer->CreateField(&oFieldDefn);
            }

            OGRFeature *poFeature = new OGRFeature(poCurLayer->GetLayerDefn());
            for (size_t i = 0; i < apoFirstLineValues.size(); i++)
            {
                SetField(poFeature, static_cast<int>(i),
                         apoFirstLineValues[i].c_str());
            }
            CPL_IGNORE_RET_VAL(poCurLayer->CreateFeature(poFeature));
            delete poFeature;
        }

        if (poCurLayer)
        {
            if (CPLTestBool(CPLGetConfigOption("ODS_RESOLVE_FORMULAS", "YES")))
            {
                poCurLayer->ResetReading();

                int nRow = 0;
                OGRFeature *poFeature = poCurLayer->GetNextFeature();
                while (poFeature)
                {
                    for (int i = 0; i < poFeature->GetFieldCount(); i++)
                    {
                        if (poFeature->IsFieldSetAndNotNull(i) &&
                            poFeature->GetFieldDefnRef(i)->GetType() ==
                                OFTString)
                        {
                            const char *pszVal = poFeature->GetFieldAsString(i);
                            if (STARTS_WITH(pszVal, "of:="))
                            {
                                ODSCellEvaluator oCellEvaluator(poCurLayer);
                                oCellEvaluator.Evaluate(nRow, i);
                            }
                        }
                    }
                    delete poFeature;

                    poFeature = poCurLayer->GetNextFeature();
                    nRow++;
                }
            }

            poCurLayer->ResetReading();

            reinterpret_cast<OGRMemLayer *>(poCurLayer)
                ->SetUpdatable(bUpdatable);
            reinterpret_cast<OGRMemLayer *>(poCurLayer)->SetAdvertizeUTF8(true);
            reinterpret_cast<OGRODSLayer *>(poCurLayer)->SetUpdated(false);
        }

        poCurLayer = nullptr;
    }
}

/************************************************************************/
/*                           FillRepeatedCells()                        */
/************************************************************************/

void OGRODSDataSource::FillRepeatedCells(bool wasLastCell)
{
    if (wasLastCell && osValue.empty() && osFormula.empty())
    {
        nCellsRepeated = 0;
        return;
    }

    if (nCellsRepeated < 0 || nCellsRepeated > 10000)
    {
        CPLError(CE_Failure, CPLE_NotSupported,
                 "Invalid value for number-columns-repeated = %d",
                 nCellsRepeated);
        bEndTableParsing = true;
        nCellsRepeated = 0;
        return;
    }
    const int nFields =
        nCellsRepeated + (poCurLayer != nullptr
                              ? poCurLayer->GetLayerDefn()->GetFieldCount()
                              : 0);
    if (nFields > 0 && nRowsRepeated > 100000 / nFields)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "Too big gap with previous valid row");
        bEndTableParsing = true;
        nCellsRepeated = 0;
        return;
    }

    // Use 16 as minimum cost for each allocation.
    const size_t nCellMemSize = std::max<size_t>(
        16, (!osValue.empty()) ? osValue.size() : osFormula.size());
    if (nCellMemSize > static_cast<size_t>(10 * 1024 * 1024) /
                           (std::max(nCellsRepeated, 1) * nRowsRepeated))
    {
        CPLError(CE_Failure, CPLE_NotSupported,
                 "Too much memory for row/cell repetition");
        bEndTableParsing = true;
        nCellsRepeated = 0;
        return;
    }

    m_nAccRepeatedMemory +=
        nCellMemSize * std::max(nCellsRepeated, 1) * nRowsRepeated;
    if (m_nAccRepeatedMemory > static_cast<size_t>(10 * 1024 * 1024))
    {
        CPLError(CE_Failure, CPLE_NotSupported,
                 "Too much accumulated memory for row/cell repetition. "
                 "Parsing stopped");
        bEndTableParsing = true;
        nCellsRepeated = 0;
        bStopParsing = true;
        return;
    }

    for (int i = 0; i < nCellsRepeated; i++)
    {
        if (!osValue.empty())
            apoCurLineValues.push_back(osValue);
        else
            apoCurLineValues.push_back(osFormula);
        apoCurLineTypes.push_back(osValueType);
    }

    nCurCol += nCellsRepeated;
    nCellsRepeated = 0;
}

/************************************************************************/
/*                            startElementRow()                         */
/************************************************************************/

void OGRODSDataSource::startElementRow(const char *pszNameIn,
                                       const char **ppszAttr)
{
    FillRepeatedCells(false);

    if (strcmp(pszNameIn, "table:table-cell") == 0)
    {
        PushState(STATE_CELL);

        osValueType = GetAttributeValue(ppszAttr, "office:value-type", "");
        const char *pszValue =
            GetAttributeValue(ppszAttr, "office:value", nullptr);
        if (pszValue)
            osValue = pszValue;
        else
        {
            const char *pszDateValue =
                GetAttributeValue(ppszAttr, "office:date-value", nullptr);
            if (pszDateValue)
                osValue = pszDateValue;
            else
                osValue = GetAttributeValue(ppszAttr, "office:time-value", "");
        }

        const char *pszFormula =
            GetAttributeValue(ppszAttr, "table:formula", nullptr);
        if (pszFormula && STARTS_WITH(pszFormula, "of:="))
        {
            osFormula = pszFormula;
            if (osFormula == "of:=TRUE()")
            {
                osValue = "1";
                osValueType = "bool";
                osFormula.clear();
            }
            else if (osFormula == "of:=FALSE()")
            {
                osValue = "0";
                osValueType = "bool";
                osFormula.clear();
            }
            else if (osValueType.empty())
            {
                osValueType = "formula";
            }
        }
        else
            osFormula = "";
        m_bValueFromTableCellAttribute = !osValue.empty();

        nCellsRepeated = atoi(
            GetAttributeValue(ppszAttr, "table:number-columns-repeated", "1"));
    }
    else if (strcmp(pszNameIn, "table:covered-table-cell") == 0)
    {
        /* Merged cell */
        apoCurLineValues.push_back("");
        apoCurLineTypes.push_back("");

        nCurCol += 1;
    }
}

/************************************************************************/
/*                            endElementRow()                           */
/************************************************************************/

void OGRODSDataSource::endElementRow(
    CPL_UNUSED /*in non-DEBUG*/ const char *pszNameIn)
{
    if (stateStack[nStackDepth].nBeginDepth == nDepth)
    {
        CPLAssert(strcmp(pszNameIn, "table:table-row") == 0);

        FillRepeatedCells(true);

        /* Remove blank columns at the right to defer type evaluation */
        /* until necessary */
        size_t i = apoCurLineTypes.size();
        while (i > 0)
        {
            i--;
            if (apoCurLineTypes[i] == "")
            {
                apoCurLineValues.resize(i);
                apoCurLineTypes.resize(i);
            }
            else
            {
                break;
            }
        }

        /* Do not add immediately empty rows. Wait until there is another non */
        /* empty row */
        OGRFeature *poFeature = nullptr;

        if (nCurLine >= 2 && apoCurLineTypes.empty())
        {
            nEmptyRowsAccumulated += nRowsRepeated;
            return;
        }
        else if (nEmptyRowsAccumulated > 0)
        {
            for (i = 0; i < (size_t)nEmptyRowsAccumulated; i++)
            {
                poFeature = new OGRFeature(poCurLayer->GetLayerDefn());
                CPL_IGNORE_RET_VAL(poCurLayer->CreateFeature(poFeature));
                delete poFeature;
            }
            nCurLine += nEmptyRowsAccumulated;
            nEmptyRowsAccumulated = 0;
        }

        /* Backup first line values and types in special arrays */
        if (nCurLine == 0)
        {
            apoFirstLineTypes = apoCurLineTypes;
            apoFirstLineValues = apoCurLineValues;

#if skip_leading_empty_rows
            if (apoFirstLineTypes.empty())
            {
                /* Skip leading empty rows */
                apoFirstLineTypes.resize(0);
                apoFirstLineValues.resize(0);
                return;
            }
#endif
        }

        if (nCurLine == 1)
        {
            DetectHeaderLine();

            poCurLayer->SetHasHeaderLine(bFirstLineIsHeaders);

            ReserveAndLimitFieldCount(poCurLayer, apoFirstLineValues);

            if (bFirstLineIsHeaders)
            {
                for (i = 0; i < apoFirstLineValues.size(); i++)
                {
                    const char *pszFieldName = apoFirstLineValues[i].c_str();
                    if (pszFieldName[0] == '\0')
                        pszFieldName = CPLSPrintf("Field%d", (int)i + 1);
                    OGRFieldType eType = OFTString;
                    OGRFieldSubType eSubType = OFSTNone;
                    if (i < apoCurLineValues.size())
                    {
                        eType = GetOGRFieldType(apoCurLineValues[i].c_str(),
                                                apoCurLineTypes[i].c_str(),
                                                eSubType);
                    }
                    OGRFieldDefn oFieldDefn(pszFieldName, eType);
                    oFieldDefn.SetSubType(eSubType);
                    poCurLayer->CreateField(&oFieldDefn);
                }
            }
            else
            {
                for (i = 0; i < apoFirstLineValues.size(); i++)
                {
                    const char *pszFieldName =
                        CPLSPrintf("Field%d", (int)i + 1);
                    OGRFieldSubType eSubType = OFSTNone;
                    OGRFieldType eType =
                        GetOGRFieldType(apoFirstLineValues[i].c_str(),
                                        apoFirstLineTypes[i].c_str(), eSubType);
                    OGRFieldDefn oFieldDefn(pszFieldName, eType);
                    oFieldDefn.SetSubType(eSubType);
                    poCurLayer->CreateField(&oFieldDefn);
                }

                poFeature = new OGRFeature(poCurLayer->GetLayerDefn());
                for (i = 0; i < apoFirstLineValues.size(); i++)
                {
                    SetField(poFeature, static_cast<int>(i),
                             apoFirstLineValues[i].c_str());
                }
                CPL_IGNORE_RET_VAL(poCurLayer->CreateFeature(poFeature));
                delete poFeature;
            }
        }

        if (nCurLine >= 1 || (nCurLine == 0 && nRowsRepeated > 1))
        {
            /* Add new fields found on following lines. */
            if (apoCurLineValues.size() >
                (size_t)poCurLayer->GetLayerDefn()->GetFieldCount())
            {
                GIntBig nFeatureCount = poCurLayer->GetFeatureCount(false);
                if (nFeatureCount > 0 &&
                    static_cast<size_t>(
                        apoCurLineValues.size() -
                        poCurLayer->GetLayerDefn()->GetFieldCount()) >
                        static_cast<size_t>(100000 / nFeatureCount))
                {
                    CPLError(CE_Failure, CPLE_NotSupported,
                             "Adding too many columns to too many "
                             "existing features");
                    bEndTableParsing = true;
                    return;
                }

                ReserveAndLimitFieldCount(poCurLayer, apoCurLineValues);

                for (i = static_cast<size_t>(
                         poCurLayer->GetLayerDefn()->GetFieldCount());
                     i < apoCurLineValues.size(); i++)
                {
                    const char *pszFieldName =
                        CPLSPrintf("Field%d", static_cast<int>(i) + 1);
                    OGRFieldSubType eSubType = OFSTNone;
                    const OGRFieldType eType =
                        GetOGRFieldType(apoCurLineValues[i].c_str(),
                                        apoCurLineTypes[i].c_str(), eSubType);
                    OGRFieldDefn oFieldDefn(pszFieldName, eType);
                    oFieldDefn.SetSubType(eSubType);
                    poCurLayer->CreateField(&oFieldDefn);
                }
            }

            /* Update field type if necessary */
            if (bAutodetectTypes)
            {
                for (i = 0; i < apoCurLineValues.size(); i++)
                {
                    if (!apoCurLineValues[i].empty())
                    {
                        OGRFieldSubType eValSubType = OFSTNone;
                        const OGRFieldType eValType = GetOGRFieldType(
                            apoCurLineValues[i].c_str(),
                            apoCurLineTypes[i].c_str(), eValSubType);
                        OGRFieldDefn *poFieldDefn =
                            poCurLayer->GetLayerDefn()->GetFieldDefn(
                                static_cast<int>(i));
                        const OGRFieldType eFieldType = poFieldDefn->GetType();
                        if (eFieldType == OFTDateTime &&
                            (eValType == OFTDate || eValType == OFTTime))
                        {
                            /* ok */
                        }
                        else if (eFieldType == OFTReal &&
                                 (eValType == OFTInteger ||
                                  eValType == OFTInteger64))
                        {
                            /* ok */;
                        }
                        else if (eFieldType == OFTInteger64 &&
                                 eValType == OFTInteger)
                        {
                            /* ok */;
                        }
                        else if (eFieldType != OFTString &&
                                 eValType != eFieldType)
                        {
                            OGRFieldDefn oNewFieldDefn(
                                poCurLayer->GetLayerDefn()->GetFieldDefn(
                                    static_cast<int>(i)));
                            oNewFieldDefn.SetSubType(OFSTNone);
                            if ((eFieldType == OFTDate ||
                                 eFieldType == OFTTime) &&
                                eValType == OFTDateTime)
                                oNewFieldDefn.SetType(OFTDateTime);
                            else if ((eFieldType == OFTInteger ||
                                      eFieldType == OFTInteger64) &&
                                     eValType == OFTReal)
                                oNewFieldDefn.SetType(OFTReal);
                            else if (eFieldType == OFTInteger &&
                                     eValType == OFTInteger64)
                                oNewFieldDefn.SetType(OFTInteger64);
                            else
                                oNewFieldDefn.SetType(OFTString);
                            poCurLayer->AlterFieldDefn(static_cast<int>(i),
                                                       &oNewFieldDefn,
                                                       ALTER_TYPE_FLAG);
                        }
                        else if (eFieldType == OFTInteger &&
                                 poFieldDefn->GetSubType() == OFSTBoolean &&
                                 eValType == OFTInteger &&
                                 eValSubType != OFSTBoolean)
                        {
                            poFieldDefn->SetSubType(OFSTNone);
                        }
                    }
                }
            }

            /* Add feature for current line */
            for (int j = 0; j < nRowsRepeated; j++)
            {
                poFeature = new OGRFeature(poCurLayer->GetLayerDefn());
                for (i = 0; i < apoCurLineValues.size(); i++)
                {
                    SetField(poFeature, static_cast<int>(i),
                             apoCurLineValues[i].c_str());
                }
                CPL_IGNORE_RET_VAL(poCurLayer->CreateFeature(poFeature));
                delete poFeature;
            }
        }

        nCurLine += nRowsRepeated;
    }
}

/************************************************************************/
/*                           startElementCell()                         */
/************************************************************************/

void OGRODSDataSource::startElementCell(const char *pszNameIn,
                                        const char ** /*ppszAttr*/)
{
    if (!m_bValueFromTableCellAttribute && strcmp(pszNameIn, "text:p") == 0)
    {
        if (!osValue.empty())
            osValue += '\n';
        PushState(STATE_TEXTP);
    }
}

/************************************************************************/
/*                            endElementCell()                          */
/************************************************************************/

void OGRODSDataSource::endElementCell(
    CPL_UNUSED /*in non-DEBUG*/ const char *pszNameIn)
{
    if (stateStack[nStackDepth].nBeginDepth == nDepth)
    {
        CPLAssert(strcmp(pszNameIn, "table:table-cell") == 0);
    }
}

/************************************************************************/
/*                           dataHandlerTextP()                         */
/************************************************************************/

void OGRODSDataSource::dataHandlerTextP(const char *data, int nLen)
{
    osValue.append(data, nLen);
}

/************************************************************************/
/*                             AnalyseFile()                            */
/************************************************************************/

void OGRODSDataSource::AnalyseFile()
{
    if (bAnalysedFile)
        return;

    bAnalysedFile = true;

    AnalyseSettings();

    oParser = OGRCreateExpatXMLParser();
    XML_SetElementHandler(oParser, OGRODS::startElementCbk,
                          OGRODS::endElementCbk);
    XML_SetCharacterDataHandler(oParser, OGRODS::dataHandlerCbk);
    XML_SetUserData(oParser, this);

    nDepth = 0;
    nStackDepth = 0;
    stateStack[0].nBeginDepth = 0;
    bStopParsing = false;
    nWithoutEventCounter = 0;

    VSIFSeekL(fpContent, 0, SEEK_SET);

    char aBuf[BUFSIZ];
    int nDone = 0;
    do
    {
        nDataHandlerCounter = 0;
        unsigned int nLen = static_cast<unsigned int>(
            VSIFReadL(aBuf, 1, sizeof(aBuf), fpContent));
        nDone = VSIFEofL(fpContent);
        if (XML_Parse(oParser, aBuf, nLen, nDone) == XML_STATUS_ERROR)
        {
            CPLError(CE_Failure, CPLE_AppDefined,
                     "XML parsing of ODS file failed : %s at line %d, "
                     "column %d",
                     XML_ErrorString(XML_GetErrorCode(oParser)),
                     static_cast<int>(XML_GetCurrentLineNumber(oParser)),
                     static_cast<int>(XML_GetCurrentColumnNumber(oParser)));
            bStopParsing = true;
        }
        nWithoutEventCounter++;
    } while (!nDone && !bStopParsing && nWithoutEventCounter < 10);

    XML_ParserFree(oParser);
    oParser = nullptr;

    if (nWithoutEventCounter == 10)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "Too much data inside one element. File probably corrupted");
        bStopParsing = true;
    }

    VSIFCloseL(fpContent);
    fpContent = nullptr;

    bUpdated = false;
}

/************************************************************************/
/*                        startElementStylesCbk()                       */
/************************************************************************/

static void XMLCALL startElementStylesCbk(void *pUserData, const char *pszName,
                                          const char **ppszAttr)
{
    static_cast<OGRODSDataSource *>(pUserData)->startElementStylesCbk(pszName,
                                                                      ppszAttr);
}

void OGRODSDataSource::startElementStylesCbk(const char *pszNameIn,
                                             const char **ppszAttr)
{
    if (bStopParsing)
        return;

    nWithoutEventCounter = 0;

    if (nStackDepth == 0 &&
        strcmp(pszNameIn, "config:config-item-map-named") == 0 &&
        strcmp(GetAttributeValue(ppszAttr, "config:name", ""), "Tables") == 0)
    {
        stateStack[++nStackDepth].nBeginDepth = nDepth;
    }
    else if (nStackDepth == 1 &&
             strcmp(pszNameIn, "config:config-item-map-entry") == 0)
    {
        const char *pszTableName =
            GetAttributeValue(ppszAttr, "config:name", nullptr);
        if (pszTableName)
        {
            osCurrentConfigTableName = pszTableName;
            nVerticalSplitFlags = 0;
            stateStack[++nStackDepth].nBeginDepth = nDepth;
        }
    }
    else if (nStackDepth == 2 && strcmp(pszNameIn, "config:config-item") == 0)
    {
        const char *pszConfigName =
            GetAttributeValue(ppszAttr, "config:name", nullptr);
        if (pszConfigName)
        {
            osConfigName = pszConfigName;
            osValue = "";
            stateStack[++nStackDepth].nBeginDepth = nDepth;
        }
    }

    nDepth++;
}

/************************************************************************/
/*                        endElementStylesCbk()                         */
/************************************************************************/

static void XMLCALL endElementStylesCbk(void *pUserData, const char *pszName)
{
    static_cast<OGRODSDataSource *>(pUserData)->endElementStylesCbk(pszName);
}

void OGRODSDataSource::endElementStylesCbk(const char * /*pszName*/)
{
    if (bStopParsing)
        return;

    nWithoutEventCounter = 0;
    nDepth--;

    if (nStackDepth > 0 && stateStack[nStackDepth].nBeginDepth == nDepth)
    {
        if (nStackDepth == 2)
        {
            if (nVerticalSplitFlags == (1 | 2))
                osSetLayerHasSplitter.insert(osCurrentConfigTableName);
        }
        if (nStackDepth == 3)
        {
            if (osConfigName == "VerticalSplitMode" && osValue == "2")
                nVerticalSplitFlags |= 1;
            else if (osConfigName == "VerticalSplitPosition" && osValue == "1")
                nVerticalSplitFlags |= 2;
        }
        nStackDepth--;
    }
}

/************************************************************************/
/*                         dataHandlerStylesCbk()                       */
/************************************************************************/

static void XMLCALL dataHandlerStylesCbk(void *pUserData, const char *data,
                                         int nLen)
{
    static_cast<OGRODSDataSource *>(pUserData)->dataHandlerStylesCbk(data,
                                                                     nLen);
}

void OGRODSDataSource::dataHandlerStylesCbk(const char *data, int nLen)
{
    if (bStopParsing)
        return;

    nDataHandlerCounter++;
    if (nDataHandlerCounter >= BUFSIZ)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "File probably corrupted (million laugh pattern)");
        XML_StopParser(oParser, XML_FALSE);
        bStopParsing = true;
        return;
    }

    nWithoutEventCounter = 0;

    if (nStackDepth == 3)
    {
        osValue.append(data, nLen);
    }
}

/************************************************************************/
/*                           AnalyseSettings()                          */
/*                                                                      */
/* We parse settings.xml to see which layers have a vertical splitter   */
/* on the first line, so as to use it as the header line.               */
/************************************************************************/

void OGRODSDataSource::AnalyseSettings()
{
    if (fpSettings == nullptr)
        return;

    oParser = OGRCreateExpatXMLParser();
    XML_SetElementHandler(oParser, OGRODS::startElementStylesCbk,
                          OGRODS::endElementStylesCbk);
    XML_SetCharacterDataHandler(oParser, OGRODS::dataHandlerStylesCbk);
    XML_SetUserData(oParser, this);

    nDepth = 0;
    nStackDepth = 0;
    bStopParsing = false;
    nWithoutEventCounter = 0;

    VSIFSeekL(fpSettings, 0, SEEK_SET);

    char aBuf[BUFSIZ];
    int nDone = 0;
    do
    {
        nDataHandlerCounter = 0;
        unsigned int nLen =
            (unsigned int)VSIFReadL(aBuf, 1, sizeof(aBuf), fpSettings);
        nDone = VSIFEofL(fpSettings);
        if (XML_Parse(oParser, aBuf, nLen, nDone) == XML_STATUS_ERROR)
        {
            CPLError(CE_Failure, CPLE_AppDefined,
                     "XML parsing of styles.xml file failed : %s at line %d, "
                     "column %d",
                     XML_ErrorString(XML_GetErrorCode(oParser)),
                     (int)XML_GetCurrentLineNumber(oParser),
                     (int)XML_GetCurrentColumnNumber(oParser));
            bStopParsing = true;
        }
        nWithoutEventCounter++;
    } while (!nDone && !bStopParsing && nWithoutEventCounter < 10);

    XML_ParserFree(oParser);
    oParser = nullptr;

    if (nWithoutEventCounter == 10)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "Too much data inside one element. File probably corrupted");
        bStopParsing = true;
    }

    VSIFCloseL(fpSettings);
    fpSettings = nullptr;
}

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

OGRLayer *OGRODSDataSource::ICreateLayer(const char *pszLayerName,
                                         OGRSpatialReference * /* poSRS */,
                                         OGRwkbGeometryType /* eType */,
                                         char **papszOptions)
{
    /* -------------------------------------------------------------------- */
    /*      Verify we are in update mode.                                   */
    /* -------------------------------------------------------------------- */
    if (!bUpdatable)
    {
        CPLError(CE_Failure, CPLE_NoWriteAccess,
                 "Data source %s opened read-only.\n"
                 "New layer %s cannot be created.\n",
                 pszName, pszLayerName);

        return nullptr;
    }

    AnalyseFile();

    /* -------------------------------------------------------------------- */
    /*      Do we already have this layer?  If so, should we blow it        */
    /*      away?                                                           */
    /* -------------------------------------------------------------------- */
    for (int iLayer = 0; iLayer < nLayers; iLayer++)
    {
        if (EQUAL(pszLayerName, papoLayers[iLayer]->GetName()))
        {
            if (CSLFetchNameValue(papszOptions, "OVERWRITE") != nullptr &&
                !EQUAL(CSLFetchNameValue(papszOptions, "OVERWRITE"), "NO"))
            {
                DeleteLayer(pszLayerName);
            }
            else
            {
                CPLError(CE_Failure, CPLE_AppDefined,
                         "Layer %s already exists, CreateLayer failed.\n"
                         "Use the layer creation option OVERWRITE=YES to "
                         "replace it.",
                         pszLayerName);
                return nullptr;
            }
        }
    }

    /* -------------------------------------------------------------------- */
    /*      Create the layer object.                                        */
    /* -------------------------------------------------------------------- */
    OGRLayer *poLayer = new OGRODSLayer(this, pszLayerName, TRUE);

    papoLayers = static_cast<OGRLayer **>(
        CPLRealloc(papoLayers, (nLayers + 1) * sizeof(OGRLayer *)));
    papoLayers[nLayers] = poLayer;
    nLayers++;

    bUpdated = true;

    return poLayer;
}

/************************************************************************/
/*                            DeleteLayer()                             */
/************************************************************************/

void OGRODSDataSource::DeleteLayer(const char *pszLayerName)

{
    /* -------------------------------------------------------------------- */
    /*      Verify we are in update mode.                                   */
    /* -------------------------------------------------------------------- */
    if (!bUpdatable)
    {
        CPLError(CE_Failure, CPLE_NoWriteAccess,
                 "Data source %s opened read-only.\n"
                 "Layer %s cannot be deleted.\n",
                 pszName, pszLayerName);

        return;
    }

    /* -------------------------------------------------------------------- */
    /*      Try to find layer.                                              */
    /* -------------------------------------------------------------------- */
    int iLayer = 0;
    for (; iLayer < nLayers; iLayer++)
    {
        if (EQUAL(pszLayerName, papoLayers[iLayer]->GetName()))
            break;
    }

    if (iLayer == nLayers)
    {
        CPLError(
            CE_Failure, CPLE_AppDefined,
            "Attempt to delete layer '%s', but this layer is not known to OGR.",
            pszLayerName);
        return;
    }

    DeleteLayer(iLayer);
}

/************************************************************************/
/*                            DeleteLayer()                             */
/************************************************************************/

OGRErr OGRODSDataSource::DeleteLayer(int iLayer)
{
    AnalyseFile();

    if (iLayer < 0 || iLayer >= nLayers)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "Layer %d not in legal range of 0 to %d.", iLayer,
                 nLayers - 1);
        return OGRERR_FAILURE;
    }

    /* -------------------------------------------------------------------- */
    /*      Blow away our OGR structures related to the layer.  This is     */
    /*      pretty dangerous if anything has a reference to this layer!     */
    /* -------------------------------------------------------------------- */

    delete papoLayers[iLayer];
    memmove(papoLayers + iLayer, papoLayers + iLayer + 1,
            sizeof(void *) * (nLayers - iLayer - 1));
    nLayers--;

    bUpdated = true;

    return OGRERR_NONE;
}

/************************************************************************/
/*                           HasHeaderLine()                            */
/************************************************************************/

static bool HasHeaderLine(OGRLayer *poLayer)
{
    OGRFeatureDefn *poFDefn = poLayer->GetLayerDefn();
    bool bHasHeaders = false;

    for (int j = 0; j < poFDefn->GetFieldCount(); j++)
    {
        if (strcmp(poFDefn->GetFieldDefn(j)->GetNameRef(),
                   CPLSPrintf("Field%d", j + 1)) != 0)
            bHasHeaders = true;
    }

    return bHasHeaders;
}

/************************************************************************/
/*                            WriteLayer()                              */
/************************************************************************/

static void WriteLayer(VSILFILE *fp, OGRLayer *poLayer)
{
    const char *pszLayerName = poLayer->GetName();
    char *pszXML = OGRGetXML_UTF8_EscapedString(pszLayerName);
    VSIFPrintfL(fp, "<table:table table:name=\"%s\">\n", pszXML);
    CPLFree(pszXML);

    poLayer->ResetReading();

    OGRFeature *poFeature = poLayer->GetNextFeature();

    OGRFeatureDefn *poFDefn = poLayer->GetLayerDefn();
    const bool bHasHeaders = HasHeaderLine(poLayer);

    for (int j = 0; j < poFDefn->GetFieldCount(); j++)
    {
        int nStyleNumber = 1;
        if (poFDefn->GetFieldDefn(j)->GetType() == OFTDateTime)
            nStyleNumber = 2;
        VSIFPrintfL(fp,
                    "<table:table-column table:style-name=\"co%d\" "
                    "table:default-cell-style-name=\"Default\"/>\n",
                    nStyleNumber);
    }

    if (bHasHeaders && poFeature != nullptr)
    {
        VSIFPrintfL(fp, "<table:table-row>\n");
        for (int j = 0; j < poFDefn->GetFieldCount(); j++)
        {
            const char *pszVal = poFDefn->GetFieldDefn(j)->GetNameRef();

            VSIFPrintfL(fp,
                        "<table:table-cell office:value-type=\"string\">\n");
            pszXML = OGRGetXML_UTF8_EscapedString(pszVal);
            VSIFPrintfL(fp, "<text:p>%s</text:p>\n", pszXML);
            CPLFree(pszXML);
            VSIFPrintfL(fp, "</table:table-cell>\n");
        }
        VSIFPrintfL(fp, "</table:table-row>\n");
    }

    while (poFeature != nullptr)
    {
        VSIFPrintfL(fp, "<table:table-row>\n");
        for (int j = 0; j < poFeature->GetFieldCount(); j++)
        {
            if (poFeature->IsFieldSetAndNotNull(j))
            {
                OGRFieldDefn *poFieldDefn = poFDefn->GetFieldDefn(j);
                const OGRFieldType eType = poFieldDefn->GetType();

                if (eType == OFTReal)
                {
                    VSIFPrintfL(fp,
                                "<table:table-cell office:value-type=\"float\" "
                                "office:value=\"%.16f\"/>\n",
                                poFeature->GetFieldAsDouble(j));
                }
                else if (eType == OFTInteger)
                {
                    const int nVal = poFeature->GetFieldAsInteger(j);
                    if (poFieldDefn->GetSubType() == OFSTBoolean)
                    {
                        VSIFPrintfL(fp,
                                    "<table:table-cell "
                                    "table:formula=\"of:=%s()\" "
                                    "office:value-type=\"float\" "
                                    "office:value=\"%d\"/>\n",
                                    nVal ? "TRUE" : "FALSE", nVal);
                    }
                    else
                    {
                        VSIFPrintfL(
                            fp,
                            "<table:table-cell office:value-type=\"float\" "
                            "office:value=\"%d\"/>\n",
                            nVal);
                    }
                }
                else if (eType == OFTInteger64)
                {
                    VSIFPrintfL(fp,
                                "<table:table-cell office:value-type=\"float\" "
                                "office:value=\"" CPL_FRMT_GIB "\"/>\n",
                                poFeature->GetFieldAsInteger64(j));
                }
                else if (eType == OFTDateTime)
                {
                    int nYear = 0;
                    int nMonth = 0;
                    int nDay = 0;
                    int nHour = 0;
                    int nMinute = 0;
                    int nTZFlag = 0;
                    float fSecond = 0.0f;
                    poFeature->GetFieldAsDateTime(j, &nYear, &nMonth, &nDay,
                                                  &nHour, &nMinute, &fSecond,
                                                  &nTZFlag);
                    if (OGR_GET_MS(fSecond))
                    {
                        VSIFPrintfL(
                            fp,
                            "<table:table-cell "
                            "table:style-name=\"stDateTimeMilliseconds\" "
                            "office:value-type=\"date\" "
                            "office:date-value="
                            "\"%04d-%02d-%02dT%02d:%02d:%06.3f\">\n",
                            nYear, nMonth, nDay, nHour, nMinute, fSecond);
                        VSIFPrintfL(fp,
                                    "<text:p>%02d/%02d/%04d "
                                    "%02d:%02d:%06.3f</text:p>\n",
                                    nDay, nMonth, nYear, nHour, nMinute,
                                    fSecond);
                    }
                    else
                    {
                        VSIFPrintfL(fp,
                                    "<table:table-cell "
                                    "table:style-name=\"stDateTime\" "
                                    "office:value-type=\"date\" "
                                    "office:date-value="
                                    "\"%04d-%02d-%02dT%02d:%02d:%02d\">\n",
                                    nYear, nMonth, nDay, nHour, nMinute,
                                    static_cast<int>(fSecond));
                        VSIFPrintfL(
                            fp,
                            "<text:p>%02d/%02d/%04d %02d:%02d:%02d</text:p>\n",
                            nDay, nMonth, nYear, nHour, nMinute,
                            static_cast<int>(fSecond));
                    }
                    VSIFPrintfL(fp, "</table:table-cell>\n");
                }
                else if (eType == OFTDate)
                {
                    int nYear = 0;
                    int nMonth = 0;
                    int nDay = 0;
                    int nHour = 0;
                    int nMinute = 0;
                    int nSecond = 0;
                    int nTZFlag = 0;
                    poFeature->GetFieldAsDateTime(j, &nYear, &nMonth, &nDay,
                                                  &nHour, &nMinute, &nSecond,
                                                  &nTZFlag);
                    VSIFPrintfL(fp,
                                "<table:table-cell table:style-name=\"stDate\" "
                                "office:value-type=\"date\" "
                                "office:date-value=\"%04d-%02d-%02d\">\n",
                                nYear, nMonth, nDay);
                    VSIFPrintfL(fp, "<text:p>%02d/%02d/%04d</text:p>\n", nDay,
                                nMonth, nYear);
                    VSIFPrintfL(fp, "</table:table-cell>\n");
                }
                else if (eType == OFTTime)
                {
                    int nYear = 0;
                    int nMonth = 0;
                    int nDay = 0;
                    int nHour = 0;
                    int nMinute = 0;
                    int nSecond = 0;
                    int nTZFlag = 0;
                    poFeature->GetFieldAsDateTime(j, &nYear, &nMonth, &nDay,
                                                  &nHour, &nMinute, &nSecond,
                                                  &nTZFlag);
                    VSIFPrintfL(fp,
                                "<table:table-cell table:style-name=\"stTime\" "
                                "office:value-type=\"time\" "
                                "office:time-value=\"PT%02dH%02dM%02dS\">\n",
                                nHour, nMinute, nSecond);
                    VSIFPrintfL(fp, "<text:p>%02d:%02d:%02d</text:p>\n", nHour,
                                nMinute, nSecond);
                    VSIFPrintfL(fp, "</table:table-cell>\n");
                }
                else
                {
                    const char *pszVal = poFeature->GetFieldAsString(j);
                    pszXML = OGRGetXML_UTF8_EscapedString(pszVal);
                    if (STARTS_WITH(pszVal, "of:="))
                    {
                        VSIFPrintfL(
                            fp, "<table:table-cell table:formula=\"%s\"/>\n",
                            pszXML);
                    }
                    else
                    {
                        VSIFPrintfL(fp, "<table:table-cell "
                                        "office:value-type=\"string\">\n");
                        VSIFPrintfL(fp, "<text:p>%s</text:p>\n", pszXML);
                        VSIFPrintfL(fp, "</table:table-cell>\n");
                    }
                    CPLFree(pszXML);
                }
            }
            else
            {
                VSIFPrintfL(fp, "<table:table-cell/>\n");
            }
        }
        VSIFPrintfL(fp, "</table:table-row>\n");

        delete poFeature;
        poFeature = poLayer->GetNextFeature();
    }

    VSIFPrintfL(fp, "</table:table>\n");
}

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

void OGRODSDataSource::FlushCache(bool /* bAtClosing */)
{
    if (!bUpdated)
        return;

    CPLAssert(fpSettings == nullptr);
    CPLAssert(fpContent == nullptr);

    VSIStatBufL sStat;
    if (VSIStatL(pszName, &sStat) == 0)
    {
        if (VSIUnlink(pszName) != 0)
        {
            CPLError(CE_Failure, CPLE_FileIO, "Cannot delete %s", pszName);
            return;
        }
    }

    CPLConfigOptionSetter oZip64Disable("CPL_CREATE_ZIP64", "NO", false);

    /* Maintain new ZIP files opened */
    void *hZIP = CPLCreateZip(pszName, nullptr);
    if (hZIP == nullptr)
    {
        CPLError(CE_Failure, CPLE_FileIO, "Cannot create %s: %s", pszName,
                 VSIGetLastErrorMsg());
        return;
    }

    /* Write uncompressed mimetype */
    char **papszOptions = CSLAddString(nullptr, "COMPRESSED=NO");
    if (CPLCreateFileInZip(hZIP, "mimetype", papszOptions) != CE_None)
    {
        CSLDestroy(papszOptions);
        CPLCloseZip(hZIP);
        return;
    }
    CSLDestroy(papszOptions);
    if (CPLWriteFileInZip(
            hZIP, "application/vnd.oasis.opendocument.spreadsheet",
            static_cast<int>(strlen(
                "application/vnd.oasis.opendocument.spreadsheet"))) != CE_None)
    {
        CPLCloseZip(hZIP);
        return;
    }
    CPLCloseFileInZip(hZIP);

    /* Now close ZIP file */
    CPLCloseZip(hZIP);
    hZIP = nullptr;

    /* Re-open with VSILFILE */
    CPLString osTmpFilename(CPLSPrintf("/vsizip/%s", pszName));
    VSILFILE *fpZIP = VSIFOpenL(osTmpFilename, "ab");
    if (fpZIP == nullptr)
        return;

    osTmpFilename = CPLSPrintf("/vsizip/%s/META-INF/manifest.xml", pszName);
    VSILFILE *fp = VSIFOpenL(osTmpFilename, "wb");
    if (fp == nullptr)
    {
        VSIFCloseL(fpZIP);
        return;
    }
    VSIFPrintfL(fp, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
    VSIFPrintfL(fp, "<manifest:manifest "
                    "xmlns:manifest=\"urn:oasis:names:tc:"
                    "opendocument:xmlns:manifest:1.0\">\n");
    VSIFPrintfL(fp, "<manifest:file-entry "
                    "manifest:media-type=\"application/vnd.oasis."
                    "opendocument.spreadsheet\" "
                    "manifest:version=\"1.2\" manifest:full-path=\"/\"/>\n");
    VSIFPrintfL(fp, "<manifest:file-entry manifest:media-type=\"text/xml\" "
                    "manifest:full-path=\"content.xml\"/>\n");
    VSIFPrintfL(fp, "<manifest:file-entry manifest:media-type=\"text/xml\" "
                    "manifest:full-path=\"styles.xml\"/>\n");
    VSIFPrintfL(fp, "<manifest:file-entry manifest:media-type=\"text/xml\" "
                    "manifest:full-path=\"meta.xml\"/>\n");
    VSIFPrintfL(fp, "<manifest:file-entry manifest:media-type=\"text/xml\" "
                    "manifest:full-path=\"settings.xml\"/>\n");
    VSIFPrintfL(fp, "</manifest:manifest>\n");
    VSIFCloseL(fp);

    osTmpFilename = CPLSPrintf("/vsizip/%s/meta.xml", pszName);
    fp = VSIFOpenL(osTmpFilename, "wb");
    if (fp == nullptr)
    {
        VSIFCloseL(fpZIP);
        return;
    }
    VSIFPrintfL(fp, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
    VSIFPrintfL(
        fp, "<office:document-meta "
            "xmlns:office=\"urn:oasis:names:tc:opendocument:xmlns:office:1.0\" "
            "office:version=\"1.2\">\n");
    VSIFPrintfL(fp, "</office:document-meta>\n");
    VSIFCloseL(fp);

    osTmpFilename = CPLSPrintf("/vsizip/%s/settings.xml", pszName);
    fp = VSIFOpenL(osTmpFilename, "wb");
    if (fp == nullptr)
    {
        VSIFCloseL(fpZIP);
        return;
    }
    VSIFPrintfL(fp, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
    VSIFPrintfL(
        fp, "<office:document-settings "
            "xmlns:office=\"urn:oasis:names:tc:opendocument:xmlns:office:1.0\" "
            "xmlns:config=\"urn:oasis:names:tc:opendocument:xmlns:config:1.0\" "
            "xmlns:ooo=\"http://openoffice.org/2004/office\" "
            "office:version=\"1.2\">\n");
    VSIFPrintfL(fp, "<office:settings>\n");
    VSIFPrintfL(fp,
                "<config:config-item-set config:name=\"ooo:view-settings\">\n");
    VSIFPrintfL(fp, "<config:config-item-map-indexed config:name=\"Views\">\n");
    VSIFPrintfL(fp, "<config:config-item-map-entry>\n");
    VSIFPrintfL(fp, "<config:config-item-map-named config:name=\"Tables\">\n");
    for (int i = 0; i < nLayers; i++)
    {
        OGRLayer *poLayer = papoLayers[i];
        if (HasHeaderLine(poLayer))
        {
            /* Add vertical splitter */
            char *pszXML = OGRGetXML_UTF8_EscapedString(poLayer->GetName());
            VSIFPrintfL(fp,
                        "<config:config-item-map-entry config:name=\"%s\">\n",
                        pszXML);
            CPLFree(pszXML);
            VSIFPrintfL(fp,
                        "<config:config-item config:name=\"VerticalSplitMode\" "
                        "config:type=\"short\">2</config:config-item>\n");
            VSIFPrintfL(
                fp, "<config:config-item config:name=\"VerticalSplitPosition\" "
                    "config:type=\"int\">1</config:config-item>\n");
            VSIFPrintfL(fp,
                        "<config:config-item config:name=\"ActiveSplitRange\" "
                        "config:type=\"short\">2</config:config-item>\n");
            VSIFPrintfL(fp, "<config:config-item config:name=\"PositionTop\" "
                            "config:type=\"int\">0</config:config-item>\n");
            VSIFPrintfL(fp,
                        "<config:config-item config:name=\"PositionBottom\" "
                        "config:type=\"int\">1</config:config-item>\n");
            VSIFPrintfL(fp, "</config:config-item-map-entry>\n");
        }
    }
    VSIFPrintfL(fp, "</config:config-item-map-named>\n");
    VSIFPrintfL(fp, "</config:config-item-map-entry>\n");
    VSIFPrintfL(fp, "</config:config-item-map-indexed>\n");
    VSIFPrintfL(fp, "</config:config-item-set>\n");
    VSIFPrintfL(fp, "</office:settings>\n");
    VSIFPrintfL(fp, "</office:document-settings>\n");
    VSIFCloseL(fp);

    osTmpFilename = CPLSPrintf("/vsizip/%s/styles.xml", pszName);
    fp = VSIFOpenL(osTmpFilename, "wb");
    if (fp == nullptr)
    {
        VSIFCloseL(fpZIP);
        return;
    }
    VSIFPrintfL(fp, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
    VSIFPrintfL(
        fp, "<office:document-styles "
            "xmlns:office=\"urn:oasis:names:tc:opendocument:xmlns:office:1.0\" "
            "xmlns:style=\"urn:oasis:names:tc:opendocument:xmlns:style:1.0\" "
            "office:version=\"1.2\">\n");
    VSIFPrintfL(fp, "<office:styles>\n");
    VSIFPrintfL(fp, "<style:style style:name=\"Default\" "
                    "style:family=\"table-cell\">\n");
    VSIFPrintfL(fp, "</style:style>\n");
    VSIFPrintfL(fp, "</office:styles>\n");
    VSIFPrintfL(fp, "</office:document-styles>\n");
    VSIFCloseL(fp);

    osTmpFilename = CPLSPrintf("/vsizip/%s/content.xml", pszName);
    fp = VSIFOpenL(osTmpFilename, "wb");
    if (fp == nullptr)
    {
        VSIFCloseL(fpZIP);
        return;
    }
    VSIFPrintfL(fp, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
    VSIFPrintfL(
        fp,
        "<office:document-content "
        "xmlns:office=\"urn:oasis:names:tc:opendocument:xmlns:office:1.0\" "
        "xmlns:style=\"urn:oasis:names:tc:opendocument:xmlns:style:1.0\" "
        "xmlns:text=\"urn:oasis:names:tc:opendocument:xmlns:text:1.0\" "
        "xmlns:table=\"urn:oasis:names:tc:opendocument:xmlns:table:1.0\" "
        "xmlns:number=\"urn:oasis:names:tc:opendocument:xmlns:datastyle:1.0\" "
        "xmlns:fo=\"urn:oasis:names:tc:opendocument:xmlns:"
        "xsl-fo-compatible:1.0\" "
        "xmlns:of=\"urn:oasis:names:tc:opendocument:xmlns:of:1.2\" "
        "office:version=\"1.2\">\n");
    VSIFPrintfL(fp, "<office:scripts/>\n");
    VSIFPrintfL(fp, "<office:automatic-styles>\n");
    VSIFPrintfL(fp, "<style:style style:name=\"co1\" "
                    "style:family=\"table-column\">\n");
    VSIFPrintfL(fp, "<style:table-column-properties "
                    "fo:break-before=\"auto\" "
                    "style:column-width=\"2.5cm\"/>\n");
    VSIFPrintfL(fp, "</style:style>\n");
    VSIFPrintfL(fp, "<style:style style:name=\"co2\" "
                    "style:family=\"table-column\">\n");
    VSIFPrintfL(fp, "<style:table-column-properties "
                    "fo:break-before=\"auto\" "
                    "style:column-width=\"5cm\"/>\n");
    VSIFPrintfL(fp, "</style:style>\n");
    VSIFPrintfL(fp, "<number:date-style style:name=\"nDate\" "
                    "number:automatic-order=\"true\">\n");
    VSIFPrintfL(fp, "<number:day number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "<number:text>/</number:text>\n");
    VSIFPrintfL(fp, "<number:month number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "<number:text>/</number:text>\n");
    VSIFPrintfL(fp, "<number:year/>\n");
    VSIFPrintfL(fp, "</number:date-style>\n");
    VSIFPrintfL(fp, "<number:time-style style:name=\"nTime\">\n");
    VSIFPrintfL(fp, "<number:hours number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "<number:text>:</number:text>\n");
    VSIFPrintfL(fp, "<number:minutes number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "<number:text>:</number:text>\n");
    VSIFPrintfL(fp, "<number:seconds number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "</number:time-style>\n");
    VSIFPrintfL(fp, "<number:date-style style:name=\"nDateTime\" "
                    "number:automatic-order=\"true\">\n");
    VSIFPrintfL(fp, "<number:day number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "<number:text>/</number:text>\n");
    VSIFPrintfL(fp, "<number:month number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "<number:text>/</number:text>\n");
    VSIFPrintfL(fp, "<number:year number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "<number:text> </number:text>\n");
    VSIFPrintfL(fp, "<number:hours number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "<number:text>:</number:text>\n");
    VSIFPrintfL(fp, "<number:minutes number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "<number:text>:</number:text>\n");
    VSIFPrintfL(fp, "<number:seconds number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "</number:date-style>\n");
    VSIFPrintfL(fp,
                "<number:date-style style:name=\"nDateTimeMilliseconds\">\n");
    VSIFPrintfL(fp, "<number:day number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "<number:text>/</number:text>\n");
    VSIFPrintfL(fp, "<number:month number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "<number:text>/</number:text>\n");
    VSIFPrintfL(fp, "<number:year number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "<number:text> </number:text>\n");
    VSIFPrintfL(fp, "<number:hours number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "<number:text>:</number:text>\n");
    VSIFPrintfL(fp, "<number:minutes number:style=\"long\"/>\n");
    VSIFPrintfL(fp, "<number:text>:</number:text>\n");
    VSIFPrintfL(fp, "<number:seconds number:style=\"long\" "
                    "number:decimal-places=\"3\"/>\n");
    VSIFPrintfL(fp, "</number:date-style>\n");
    VSIFPrintfL(fp, "<style:style style:name=\"stDate\" "
                    "style:family=\"table-cell\" "
                    "style:parent-style-name=\"Default\" "
                    "style:data-style-name=\"nDate\"/>\n");
    VSIFPrintfL(fp, "<style:style style:name=\"stTime\" "
                    "style:family=\"table-cell\" "
                    "style:parent-style-name=\"Default\" "
                    "style:data-style-name=\"nTime\"/>\n");
    VSIFPrintfL(fp, "<style:style style:name=\"stDateTime\" "
                    "style:family=\"table-cell\" "
                    "style:parent-style-name=\"Default\" "
                    "style:data-style-name=\"nDateTime\"/>\n");
    VSIFPrintfL(fp, "<style:style style:name=\"stDateTimeMilliseconds\" "
                    "style:family=\"table-cell\" "
                    "style:parent-style-name=\"Default\" "
                    "style:data-style-name=\"nDateTimeMilliseconds\"/>\n");
    VSIFPrintfL(fp, "</office:automatic-styles>\n");
    VSIFPrintfL(fp, "<office:body>\n");
    VSIFPrintfL(fp, "<office:spreadsheet>\n");
    for (int i = 0; i < nLayers; i++)
    {
        WriteLayer(fp, papoLayers[i]);
    }
    VSIFPrintfL(fp, "</office:spreadsheet>\n");
    VSIFPrintfL(fp, "</office:body>\n");
    VSIFPrintfL(fp, "</office:document-content>\n");
    VSIFCloseL(fp);

    /* Now close ZIP file */
    VSIFCloseL(fpZIP);

    /* Reset updated flag at datasource and layer level */
    bUpdated = false;
    for (int i = 0; i < nLayers; i++)
    {
        reinterpret_cast<OGRODSLayer *>(papoLayers[i])->SetUpdated(false);
    }

    return;
}

/************************************************************************/
/*                          EvaluateRange()                             */
/************************************************************************/

int ODSCellEvaluator::EvaluateRange(int nRow1, int nCol1, int nRow2, int nCol2,
                                    std::vector<ods_formula_node> &aoOutValues)
{
    if (nRow1 < 0 || nRow1 >= poLayer->GetFeatureCount(FALSE) || nCol1 < 0 ||
        nCol1 >= poLayer->GetLayerDefn()->GetFieldCount())
    {
        CPLError(CE_Failure, CPLE_AppDefined, "Invalid cell (row=%d, col=%d)",
                 nRow1 + 1, nCol1 + 1);
        return FALSE;
    }

    if (nRow2 < 0 || nRow2 >= poLayer->GetFeatureCount(FALSE) || nCol2 < 0 ||
        nCol2 >= poLayer->GetLayerDefn()->GetFieldCount())
    {
        CPLError(CE_Failure, CPLE_AppDefined, "Invalid cell (row=%d, col=%d)",
                 nRow2 + 1, nCol2 + 1);
        return FALSE;
    }

    const int nIndexBackup = static_cast<int>(poLayer->GetNextReadFID());

    if (poLayer->SetNextByIndex(nRow1) != OGRERR_NONE)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "Cannot fetch feature for row = %d", nRow1);
        return FALSE;
    }

    for (int nRow = nRow1; nRow <= nRow2; nRow++)
    {
        OGRFeature *poFeature = poLayer->GetNextFeatureWithoutFIDHack();

        if (poFeature == nullptr)
        {
            CPLError(CE_Failure, CPLE_AppDefined,
                     "Cannot fetch feature for for row = %d", nRow);
            poLayer->SetNextByIndex(nIndexBackup);
            return FALSE;
        }

        for (int nCol = nCol1; nCol <= nCol2; nCol++)
        {
            if (!poFeature->IsFieldSetAndNotNull(nCol))
            {
                aoOutValues.push_back(ods_formula_node());
            }
            else if (poFeature->GetFieldDefnRef(nCol)->GetType() == OFTInteger)
            {
                aoOutValues.push_back(
                    ods_formula_node(poFeature->GetFieldAsInteger(nCol)));
            }
            else if (poFeature->GetFieldDefnRef(nCol)->GetType() == OFTReal)
            {
                aoOutValues.push_back(
                    ods_formula_node(poFeature->GetFieldAsDouble(nCol)));
            }
            else
            {
                std::string osVal(poFeature->GetFieldAsString(nCol));
                if (STARTS_WITH(osVal.c_str(), "of:="))
                {
                    delete poFeature;
                    poFeature = nullptr;

                    if (!Evaluate(nRow, nCol))
                    {
#ifdef DEBUG_VERBOSE
                        CPLError(CE_Warning, CPLE_AppDefined,
                                 "Formula at cell (%d, %d) "
                                 "has not yet been resolved",
                                 nRow + 1, nCol + 1);
#endif
                        poLayer->SetNextByIndex(nIndexBackup);
                        return FALSE;
                    }

                    poLayer->SetNextByIndex(nRow);
                    poFeature = poLayer->GetNextFeatureWithoutFIDHack();

                    if (!poFeature->IsFieldSetAndNotNull(nCol))
                    {
                        aoOutValues.push_back(ods_formula_node());
                    }
                    else if (poFeature->GetFieldDefnRef(nCol)->GetType() ==
                             OFTInteger)
                    {
                        aoOutValues.push_back(ods_formula_node(
                            poFeature->GetFieldAsInteger(nCol)));
                    }
                    else if (poFeature->GetFieldDefnRef(nCol)->GetType() ==
                             OFTReal)
                    {
                        aoOutValues.push_back(ods_formula_node(
                            poFeature->GetFieldAsDouble(nCol)));
                    }
                    else
                    {
                        osVal = poFeature->GetFieldAsString(nCol);
                        if (!STARTS_WITH(osVal.c_str(), "of:="))
                        {
                            CPLValueType eType = CPLGetValueType(osVal.c_str());
                            /* Try to convert into numeric value if possible */
                            if (eType != CPL_VALUE_STRING)
                                aoOutValues.push_back(
                                    ods_formula_node(CPLAtofM(osVal.c_str())));
                            else
                                aoOutValues.push_back(
                                    ods_formula_node(osVal.c_str()));
                        }
                    }
                }
                else
                {
                    CPLValueType eType = CPLGetValueType(osVal.c_str());
                    /* Try to convert into numeric value if possible */
                    if (eType != CPL_VALUE_STRING)
                        aoOutValues.push_back(
                            ods_formula_node(CPLAtofM(osVal.c_str())));
                    else
                        aoOutValues.push_back(ods_formula_node(osVal.c_str()));
                }
            }
        }

        delete poFeature;
    }

    poLayer->SetNextByIndex(nIndexBackup);

    return TRUE;
}

/************************************************************************/
/*                            Evaluate()                                */
/************************************************************************/

int ODSCellEvaluator::Evaluate(int nRow, int nCol)
{
    if (oVisisitedCells.find(std::pair<int, int>(nRow, nCol)) !=
        oVisisitedCells.end())
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "Circular dependency with (row=%d, col=%d)", nRow + 1,
                 nCol + 1);
        return FALSE;
    }

    oVisisitedCells.insert(std::pair<int, int>(nRow, nCol));

    if (poLayer->SetNextByIndex(nRow) != OGRERR_NONE)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "Cannot fetch feature for row = %d", nRow);
        return FALSE;
    }

    OGRFeature *poFeature = poLayer->GetNextFeatureWithoutFIDHack();
    if (poFeature->IsFieldSetAndNotNull(nCol) &&
        poFeature->GetFieldDefnRef(nCol)->GetType() == OFTString)
    {
        const char *pszVal = poFeature->GetFieldAsString(nCol);
        if (STARTS_WITH(pszVal, "of:="))
        {
            ods_formula_node *expr_out = ods_formula_compile(pszVal + 4);
            if (expr_out && expr_out->Evaluate(this) &&
                expr_out->eNodeType == SNT_CONSTANT)
            {
                /* Refetch feature in case Evaluate() modified another cell in
                 * this row */
                delete poFeature;
                poLayer->SetNextByIndex(nRow);
                poFeature = poLayer->GetNextFeatureWithoutFIDHack();

                if (expr_out->field_type == ODS_FIELD_TYPE_EMPTY)
                {
                    poFeature->UnsetField(nCol);
                    poLayer->SetFeatureWithoutFIDHack(poFeature);
                }
                else if (expr_out->field_type == ODS_FIELD_TYPE_INTEGER)
                {
                    poFeature->SetField(nCol, expr_out->int_value);
                    poLayer->SetFeatureWithoutFIDHack(poFeature);
                }
                else if (expr_out->field_type == ODS_FIELD_TYPE_FLOAT)
                {
                    poFeature->SetField(nCol, expr_out->float_value);
                    poLayer->SetFeatureWithoutFIDHack(poFeature);
                }
                else if (expr_out->field_type == ODS_FIELD_TYPE_STRING)
                {
                    poFeature->SetField(nCol, expr_out->string_value);
                    poLayer->SetFeatureWithoutFIDHack(poFeature);
                }
            }
            delete expr_out;
        }
    }

    delete poFeature;

    return TRUE;
}

}  // namespace OGRODS
