/src/gdal/ogr/ogrcurvecollection.cpp

Source
/******************************************************************************
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  The OGRCurveCollection class.
 * Author:   Even Rouault, even dot rouault at spatialys dot com
 *
 ******************************************************************************
 * Copyright (c) 2014, Even Rouault <even dot rouault at spatialys dot com>
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#include "cpl_port.h"
#include "ogr_geometry.h"

#include <cstddef>
#include <cstring>
#include <limits>
#include <new>

#include "ogr_core.h"
#include "ogr_p.h"
#include "ogr_spatialref.h"
#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_string.h"
#include "cpl_vsi.h"

//! @cond Doxygen_Suppress

/************************************************************************/
/*           OGRCurveCollection( const OGRCurveCollection& )            */
/************************************************************************/

/**
 * \brief Copy constructor.
 */

OGRCurveCollection::OGRCurveCollection(const OGRCurveCollection &other)
{
    if (other.nCurveCount > 0)
    {
        nCurveCount = other.nCurveCount;
        papoCurves = static_cast<OGRCurve **>(
            VSI_CALLOC_VERBOSE(sizeof(void *), nCurveCount));

        if (papoCurves)
        {
            for (int i = 0; i < nCurveCount; i++)
            {
                papoCurves[i] = other.papoCurves[i]->clone();
            }
        }
    }
}

/************************************************************************/
/*              OGRCurveCollection( OGRCurveCollection&& )              */
/************************************************************************/

/**
 * \brief Move constructor.
 *
 * @since GDAL 3.11
 */

OGRCurveCollection::OGRCurveCollection(OGRCurveCollection &&other)
    : nCurveCount(other.nCurveCount), papoCurves(other.papoCurves)
{
    other.nCurveCount = 0;
    other.papoCurves = nullptr;
}

/************************************************************************/
/*                        ~OGRCurveCollection()                         */
/************************************************************************/

OGRCurveCollection::~OGRCurveCollection()

{
    empty(nullptr);
}

/************************************************************************/
/*                operator=( const OGRCurveCollection& )                */
/************************************************************************/

/**
 * \brief Assignment operator.
 */

OGRCurveCollection &
OGRCurveCollection::operator=(const OGRCurveCollection &other)
{
    if (this != &other)
    {
        empty(nullptr);

        if (other.nCurveCount > 0)
        {
            nCurveCount = other.nCurveCount;
            papoCurves = static_cast<OGRCurve **>(
                VSI_MALLOC2_VERBOSE(sizeof(void *), nCurveCount));

            if (papoCurves)
            {
                for (int i = 0; i < nCurveCount; i++)
                {
                    papoCurves[i] = other.papoCurves[i]->clone();
                }
            }
        }
    }
    return *this;
}

/************************************************************************/
/*                  operator=( OGRCurveCollection&& )                   */
/************************************************************************/

/**
 * \brief Move assignment operator.
 *
 * @since GDAL 3.11
 */

OGRCurveCollection &OGRCurveCollection::operator=(OGRCurveCollection &&other)
{
    if (this != &other)
    {
        empty(nullptr);
        std::swap(nCurveCount, other.nCurveCount);
        std::swap(papoCurves, other.papoCurves);
    }
    return *this;
}

/************************************************************************/
/*                              WkbSize()                               */
/************************************************************************/

size_t OGRCurveCollection::WkbSize() const
{
    size_t nSize = 9;

    for (auto &&poSubGeom : *this)
    {
        nSize += poSubGeom->WkbSize();
    }

    return nSize;
}

/************************************************************************/
/*                          addCurveDirectly()                          */
/************************************************************************/

OGRErr OGRCurveCollection::addCurveDirectly(OGRGeometry *poGeom,
                                            OGRCurve *poCurve, int bNeedRealloc)
{
    poGeom->HomogenizeDimensionalityWith(poCurve);

    if (bNeedRealloc)
    {
#if SIZEOF_VOIDP < 8
        if (nCurveCount == std::numeric_limits<int>::max() /
                               static_cast<int>(sizeof(OGRCurve *)))
        {
            CPLError(CE_Failure, CPLE_OutOfMemory, "Too many subgeometries");
            return OGRERR_FAILURE;
        }
#else
        if (nCurveCount == std::numeric_limits<int>::max())
        {
            CPLError(CE_Failure, CPLE_AppDefined, "Too many subgeometries");
            return OGRERR_FAILURE;
        }
#endif

        OGRCurve **papoNewCurves = static_cast<OGRCurve **>(VSI_REALLOC_VERBOSE(
            papoCurves, sizeof(OGRCurve *) * (nCurveCount + 1)));
        if (papoNewCurves == nullptr)
            return OGRERR_FAILURE;
        papoCurves = papoNewCurves;
    }

    papoCurves[nCurveCount] = poCurve;

    nCurveCount++;

    return OGRERR_NONE;
}

/************************************************************************/
/*                       importPreambleFromWkb()                        */
/************************************************************************/

OGRErr OGRCurveCollection::importPreambleFromWkb(
    OGRGeometry *poGeom, const unsigned char *pabyData, size_t &nSize,
    size_t &nDataOffset, OGRwkbByteOrder &eByteOrder, size_t nMinSubGeomSize,
    OGRwkbVariant eWkbVariant)
{
    int nCurveCountNew = 0;

    OGRErr eErr = poGeom->importPreambleOfCollectionFromWkb(
        pabyData, nSize, nDataOffset, eByteOrder, nMinSubGeomSize,
        nCurveCountNew, eWkbVariant);
    if (eErr != OGRERR_NONE)
        return eErr;

    CPLAssert(nCurveCount == 0);
    nCurveCount = nCurveCountNew;

    // coverity[tainted_data]
    papoCurves = static_cast<OGRCurve **>(
        VSI_CALLOC_VERBOSE(sizeof(void *), nCurveCount));
    if (nCurveCount != 0 && papoCurves == nullptr)
    {
        nCurveCount = 0;
        return OGRERR_NOT_ENOUGH_MEMORY;
    }

    return OGRERR_NONE;
}

/************************************************************************/
/*                         importBodyFromWkb()                          */
/************************************************************************/

OGRErr OGRCurveCollection::importBodyFromWkb(
    OGRGeometry *poGeom, const unsigned char *pabyData, size_t nSize,
    bool bAcceptCompoundCurve,
    OGRErr (*pfnAddCurveDirectlyFromWkb)(OGRGeometry *poGeom,
                                         OGRCurve *poCurve),
    OGRwkbVariant eWkbVariant, size_t &nBytesConsumedOut)
{
    nBytesConsumedOut = 0;
    /* -------------------------------------------------------------------- */
    /*      Get the Geoms.                                                  */
    /* -------------------------------------------------------------------- */
    const int nIter = nCurveCount;
    nCurveCount = 0;
    size_t nDataOffset = 0;
    for (int iGeom = 0; iGeom < nIter; iGeom++)
    {
        OGRGeometry *poSubGeom = nullptr;

        // Parses sub-geometry.
        const unsigned char *pabySubData = pabyData + nDataOffset;
        if (nSize < 9 && nSize != static_cast<size_t>(-1))
            return OGRERR_NOT_ENOUGH_DATA;

        OGRwkbGeometryType eFlattenSubGeomType = wkbUnknown;
        if (OGRReadWKBGeometryType(pabySubData, eWkbVariant,
                                   &eFlattenSubGeomType) != OGRERR_NONE)
            return OGRERR_FAILURE;
        eFlattenSubGeomType = wkbFlatten(eFlattenSubGeomType);

        OGRErr eErr = OGRERR_NONE;
        size_t nSubGeomBytesConsumedOut = 0;
        if ((eFlattenSubGeomType != wkbCompoundCurve &&
             OGR_GT_IsCurve(eFlattenSubGeomType)) ||
            (bAcceptCompoundCurve && eFlattenSubGeomType == wkbCompoundCurve))
        {
            eErr = OGRGeometryFactory::createFromWkb(
                pabySubData, nullptr, &poSubGeom, nSize, eWkbVariant,
                nSubGeomBytesConsumedOut);
        }
        else
        {
            CPLDebug(
                "OGR",
                "Cannot add geometry of type (%d) to geometry of type (%d)",
                eFlattenSubGeomType, poGeom->getGeometryType());
            return OGRERR_UNSUPPORTED_GEOMETRY_TYPE;
        }

        if (eErr == OGRERR_NONE)
        {
            CPLAssert(nSubGeomBytesConsumedOut > 0);
            if (nSize != static_cast<size_t>(-1))
            {
                CPLAssert(nSize >= nSubGeomBytesConsumedOut);
                nSize -= nSubGeomBytesConsumedOut;
            }

            nDataOffset += nSubGeomBytesConsumedOut;

            OGRCurve *poCurve = poSubGeom->toCurve();
            eErr = pfnAddCurveDirectlyFromWkb(poGeom, poCurve);
        }
        if (eErr != OGRERR_NONE)
        {
            delete poSubGeom;
            return eErr;
        }
    }
    nBytesConsumedOut = nDataOffset;

    return OGRERR_NONE;
}

/************************************************************************/
/*                            exportToWkt()                             */
/************************************************************************/

std::string OGRCurveCollection::exportToWkt(const OGRGeometry *baseGeom,
                                            const OGRWktOptions &opts,
                                            OGRErr *err) const
{
    try
    {
        bool first = true;
        std::string wkt(baseGeom->getGeometryName());

        OGRWktOptions optsModified(opts);
        optsModified.variant = wkbVariantIso;
        wkt += baseGeom->wktTypeString(optsModified.variant);

        for (int i = 0; i < nCurveCount; ++i)
        {
            OGRGeometry *geom = papoCurves[i];

            OGRErr subgeomErr = OGRERR_NONE;
            std::string tempWkt = geom->exportToWkt(optsModified, &subgeomErr);
            if (subgeomErr != OGRERR_NONE)
            {
                if (err)
                    *err = subgeomErr;
                return std::string();
            }

            // A curve collection has a list of linestrings (OGRCompoundCurve),
            // which should have their leader removed, or a OGRCurvePolygon,
            // which has leaders for each of its sub-geometries that aren't
            // linestrings.
            if (tempWkt.compare(0, strlen("LINESTRING"), "LINESTRING") == 0)
            {
                auto pos = tempWkt.find('(');
                if (pos != std::string::npos)
                    tempWkt = tempWkt.substr(pos);
            }

            if (tempWkt.find("EMPTY") != std::string::npos)
                continue;

            if (first)
                wkt += '(';
            else
                wkt += ',';
            first = false;
            wkt += tempWkt;
        }

        if (err)
            *err = OGRERR_NONE;
        if (first)
            wkt += "EMPTY";
        else
            wkt += ')';
        return wkt;
    }
    catch (const std::bad_alloc &e)
    {
        CPLError(CE_Failure, CPLE_OutOfMemory, "%s", e.what());
        if (err)
            *err = OGRERR_FAILURE;
        return std::string();
    }
}

/************************************************************************/
/*                            exportToWkb()                             */
/************************************************************************/

OGRErr
OGRCurveCollection::exportToWkb(const OGRGeometry *poGeom,
                                unsigned char *pabyData,
                                const OGRwkbExportOptions *psOptions) const
{
    if (psOptions == nullptr)
    {
        static const OGRwkbExportOptions defaultOptions;
        psOptions = &defaultOptions;
    }

    /* -------------------------------------------------------------------- */
    /*      Set the byte order.                                             */
    /* -------------------------------------------------------------------- */
    pabyData[0] = DB2_V72_UNFIX_BYTE_ORDER(
        static_cast<unsigned char>(psOptions->eByteOrder));

    /* -------------------------------------------------------------------- */
    /*      Set the geometry feature type, ensuring that 3D flag is         */
    /*      preserved.                                                      */
    /* -------------------------------------------------------------------- */
    GUInt32 nGType = poGeom->getIsoGeometryType();
    if (psOptions->eWkbVariant == wkbVariantPostGIS1)
    {
        const bool bIs3D = wkbHasZ(static_cast<OGRwkbGeometryType>(nGType));
        nGType = wkbFlatten(nGType);
        if (nGType == wkbCurvePolygon)
            nGType = POSTGIS15_CURVEPOLYGON;
        if (bIs3D)
            // Explicitly set wkb25DBit.
            nGType =
                static_cast<OGRwkbGeometryType>(nGType | wkb25DBitInternalUse);
    }

    if (OGR_SWAP(psOptions->eByteOrder))
    {
        nGType = CPL_SWAP32(nGType);
    }

    memcpy(pabyData + 1, &nGType, 4);

    /* -------------------------------------------------------------------- */
    /*      Copy in the raw data.                                           */
    /* -------------------------------------------------------------------- */
    if (OGR_SWAP(psOptions->eByteOrder))
    {
        const int nCount = CPL_SWAP32(nCurveCount);
        memcpy(pabyData + 5, &nCount, 4);
    }
    else
    {
        memcpy(pabyData + 5, &nCurveCount, 4);
    }

    // TODO(schwehr): Where do these 9 values come from?
    size_t nOffset = 9;

    /* ==================================================================== */
    /*      Serialize each of the Geoms.                                    */
    /* ==================================================================== */
    for (auto &&poSubGeom : *this)
    {
        poSubGeom->exportToWkb(pabyData + nOffset, psOptions);

        nOffset += poSubGeom->WkbSize();
    }

    return OGRERR_NONE;
}

/************************************************************************/
/*                               empty()                                */
/************************************************************************/

void OGRCurveCollection::empty(OGRGeometry *poGeom)
{
    if (papoCurves != nullptr)
    {
        for (auto &&poSubGeom : *this)
        {
            delete poSubGeom;
        }
        CPLFree(papoCurves);
    }

    nCurveCount = 0;
    papoCurves = nullptr;
    if (poGeom)
        poGeom->setCoordinateDimension(2);
}

/************************************************************************/
/*                            getEnvelope()                             */
/************************************************************************/

void OGRCurveCollection::getEnvelope(OGREnvelope *psEnvelope) const
{
    OGREnvelope3D oEnv3D;
    getEnvelope(&oEnv3D);
    psEnvelope->MinX = oEnv3D.MinX;
    psEnvelope->MinY = oEnv3D.MinY;
    psEnvelope->MaxX = oEnv3D.MaxX;
    psEnvelope->MaxY = oEnv3D.MaxY;
}

/************************************************************************/
/*                            getEnvelope()                             */
/************************************************************************/

void OGRCurveCollection::getEnvelope(OGREnvelope3D *psEnvelope) const
{
    OGREnvelope3D oGeomEnv;
    bool bExtentSet = false;

    *psEnvelope = OGREnvelope3D();
    for (int iGeom = 0; iGeom < nCurveCount; iGeom++)
    {
        if (!papoCurves[iGeom]->IsEmpty())
        {
            bExtentSet = true;
            papoCurves[iGeom]->getEnvelope(&oGeomEnv);
            psEnvelope->Merge(oGeomEnv);
        }
    }

    if (!bExtentSet)
    {
        // To be backward compatible when called on empty geom
        psEnvelope->MinX = 0.0;
        psEnvelope->MinY = 0.0;
        psEnvelope->MinZ = 0.0;
        psEnvelope->MaxX = 0.0;
        psEnvelope->MaxY = 0.0;
        psEnvelope->MaxZ = 0.0;
    }
}

/************************************************************************/
/*                              IsEmpty()                               */
/************************************************************************/

bool OGRCurveCollection::IsEmpty() const
{
    for (auto &&poSubGeom : *this)
    {
        if (!poSubGeom->IsEmpty())
            return FALSE;
    }
    return TRUE;
}

/************************************************************************/
/*                               Equals()                               */
/************************************************************************/

bool OGRCurveCollection::Equals(const OGRCurveCollection *poOCC) const
{
    if (getNumCurves() != poOCC->getNumCurves())
        return FALSE;

    // Should eventually test the SRS.

    for (int iGeom = 0; iGeom < nCurveCount; iGeom++)
    {
        if (!getCurve(iGeom)->Equals(poOCC->getCurve(iGeom)))
            return FALSE;
    }

    return TRUE;
}

/************************************************************************/
/*                       setCoordinateDimension()                       */
/************************************************************************/

bool OGRCurveCollection::setCoordinateDimension(OGRGeometry *poGeom,
                                                int nNewDimension)
{
    for (auto &&poSubGeom : *this)
    {
        if (!poSubGeom->setCoordinateDimension(nNewDimension))
            return false;
    }

    return poGeom->OGRGeometry::setCoordinateDimension(nNewDimension);
}

bool OGRCurveCollection::set3D(OGRGeometry *poGeom, bool bIs3D)
{
    for (auto &&poSubGeom : *this)
    {
        if (!poSubGeom->set3D(bIs3D))
            return false;
    }

    return poGeom->OGRGeometry::set3D(bIs3D);
}

bool OGRCurveCollection::setMeasured(OGRGeometry *poGeom, bool bIsMeasured)
{
    for (auto &&poSubGeom : *this)
    {
        if (!poSubGeom->setMeasured(bIsMeasured))
            return false;
    }

    return poGeom->OGRGeometry::setMeasured(bIsMeasured);
}

/************************************************************************/
/*                       assignSpatialReference()                       */
/************************************************************************/

void OGRCurveCollection::assignSpatialReference(OGRGeometry *poGeom,
                                                const OGRSpatialReference *poSR)
{
    for (auto &&poSubGeom : *this)
    {
        poSubGeom->assignSpatialReference(poSR);
    }
    poGeom->OGRGeometry::assignSpatialReference(poSR);
}

/************************************************************************/
/*                            getNumCurves()                            */
/************************************************************************/

int OGRCurveCollection::getNumCurves() const
{
    return nCurveCount;
}

/************************************************************************/
/*                              getCurve()                              */
/************************************************************************/

OGRCurve *OGRCurveCollection::getCurve(int i)
{
    if (i < 0 || i >= nCurveCount)
        return nullptr;
    return papoCurves[i];
}

/************************************************************************/
/*                              getCurve()                              */
/************************************************************************/

const OGRCurve *OGRCurveCollection::getCurve(int i) const
{
    if (i < 0 || i >= nCurveCount)
        return nullptr;
    return papoCurves[i];
}

/************************************************************************/
/*                             stealCurve()                             */
/************************************************************************/

OGRCurve *OGRCurveCollection::stealCurve(int i)
{
    if (i < 0 || i >= nCurveCount)
        return nullptr;
    OGRCurve *poRet = papoCurves[i];
    if (i < nCurveCount - 1)
    {
        memmove(papoCurves + i, papoCurves + i + 1,
                (nCurveCount - i - 1) * sizeof(OGRCurve *));
    }
    nCurveCount--;
    return poRet;
}

/************************************************************************/
/*                             transform()                              */
/************************************************************************/

OGRErr OGRCurveCollection::transform(OGRGeometry *poGeom,
                                     OGRCoordinateTransformation *poCT)
{
    for (int iGeom = 0; iGeom < nCurveCount; iGeom++)
    {
        const OGRErr eErr = papoCurves[iGeom]->transform(poCT);
        if (eErr != OGRERR_NONE)
        {
            if (iGeom != 0)
            {
                CPLDebug("OGR", "OGRCurveCollection::transform() failed for a "
                                "geometry other than the first, meaning some "
                                "geometries are transformed and some are not!");

                return OGRERR_FAILURE;
            }

            return eErr;
        }
    }

    poGeom->assignSpatialReference(poCT->GetTargetCS());

    return OGRERR_NONE;
}

/************************************************************************/
/*                            flattenTo2D()                             */
/************************************************************************/

void OGRCurveCollection::flattenTo2D(OGRGeometry *poGeom)
{
    for (auto &&poSubGeom : *this)
    {
        poSubGeom->flattenTo2D();
    }

    poGeom->setCoordinateDimension(2);
}

/************************************************************************/
/*                             segmentize()                             */
/************************************************************************/

bool OGRCurveCollection::segmentize(double dfMaxLength)
{
    for (auto &&poSubGeom : *this)
    {
        if (!poSubGeom->segmentize(dfMaxLength))
            return false;
    }
    return true;
}

/************************************************************************/
/*                               swapXY()                               */
/************************************************************************/

void OGRCurveCollection::swapXY()
{
    for (auto &&poSubGeom : *this)
    {
        poSubGeom->swapXY();
    }
}

/************************************************************************/
/*                          hasCurveGeometry()                          */
/************************************************************************/

bool OGRCurveCollection::hasCurveGeometry(int bLookForNonLinear) const
{
    for (auto &&poSubGeom : *this)
    {
        if (poSubGeom->hasCurveGeometry(bLookForNonLinear))
            return TRUE;
    }
    return FALSE;
}

/************************************************************************/
/*                            removeCurve()                             */
/************************************************************************/

/**
 * \brief Remove a geometry from the container.
 *
 * Removing a geometry will cause the geometry count to drop by one, and all
 * "higher" geometries will shuffle down one in index.
 *
 * @param iIndex the index of the geometry to delete.  A value of -1 is a
 * special flag meaning that all geometries should be removed.
 *
 * @param bDelete if true the geometry will be deallocated, otherwise it will
 * not.  The default is true as the container is considered to own the
 * geometries in it.
 *
 * @return OGRERR_NONE if successful, or OGRERR_FAILURE if the index is
 * out of range.
 */

OGRErr OGRCurveCollection::removeCurve(int iIndex, bool bDelete)

{
    if (iIndex < -1 || iIndex >= nCurveCount)
        return OGRERR_FAILURE;

    // Special case.
    if (iIndex == -1)
    {
        while (nCurveCount > 0)
            removeCurve(nCurveCount - 1, bDelete);
        return OGRERR_NONE;
    }

    if (bDelete)
        delete papoCurves[iIndex];

    memmove(papoCurves + iIndex, papoCurves + iIndex + 1,
            sizeof(void *) * (nCurveCount - iIndex - 1));

    nCurveCount--;

    return OGRERR_NONE;
}

/************************************************************************/
/*                           hasEmptyParts()                            */
/************************************************************************/

/**
 * \brief Returns whether a geometry has empty parts/rings.
 *
 * Returns true if removeEmptyParts() will modify the geometry.
 *
 * This is different from IsEmpty().
 *
 * @since GDAL 3.10
 */
bool OGRCurveCollection::hasEmptyParts() const
{
    for (int i = 0; i < nCurveCount; ++i)
    {
        if (papoCurves[i]->IsEmpty() || papoCurves[i]->hasEmptyParts())
            return true;
    }
    return false;
}

/************************************************************************/
/*                          removeEmptyParts()                          */
/************************************************************************/

/**
 * \brief Remove empty parts/rings from this geometry.
 *
 * @since GDAL 3.10
 */
void OGRCurveCollection::removeEmptyParts()
{
    for (int i = nCurveCount - 1; i >= 0; --i)
    {
        papoCurves[i]->removeEmptyParts();
        if (papoCurves[i]->IsEmpty())
            removeCurve(i, true);
    }
}

/************************************************************************/
/*                           reversePoints()                            */
/************************************************************************/

/**
 * \brief Reverse point order.
 *
 * This method updates the points in this curve in place
 * reversing the point ordering (first for last, etc) and component ordering.
 *
 * @since 3.10
 */
void OGRCurveCollection::reversePoints()

{
    for (int i = 0; i < nCurveCount / 2; ++i)
    {
        std::swap(papoCurves[i], papoCurves[nCurveCount - 1 - i]);
    }
    for (int i = 0; i < nCurveCount; ++i)
    {
        papoCurves[i]->reversePoints();
    }
}

//! @endcond

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Created: 2026-07-25 06:50