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ogr2gmlgeometry.cpp
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ogr2gmlgeometry.cpp
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/******************************************************************************
*
* Project: GML Translator
* Purpose: Code to translate OGRGeometry to GML string representation.
* Author: Frank Warmerdam, [email protected]
*
******************************************************************************
* Copyright (c) 2002, Frank Warmerdam <[email protected]>
* Copyright (c) 2009-2013, 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.
*****************************************************************************
*
* Independent Security Audit 2003/04/17 Andrey Kiselev:
* Completed audit of this module. All functions may be used without buffer
* overflows and stack corruptions if caller could be trusted.
*
* Security Audit 2003/03/28 warmerda:
* Completed security audit. I believe that this module may be safely used
* to generate GML from arbitrary but well formed OGRGeomety objects that
* come from a potentially hostile source, but through a trusted OGR importer
* without compromising the system.
*
*/
#include "cpl_port.h"
#include "ogr_api.h"
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_minixml.h"
#include "cpl_string.h"
#include "ogr_core.h"
#include "ogr_geometry.h"
#include "ogr_p.h"
#include "ogr_spatialref.h"
constexpr int SRSDIM_LOC_GEOMETRY = 1 << 0;
constexpr int SRSDIM_LOC_POSLIST = 1 << 1;
enum GMLSRSNameFormat
{
SRSNAME_SHORT,
SRSNAME_OGC_URN,
SRSNAME_OGC_URL
};
/************************************************************************/
/* MakeGMLCoordinate() */
/************************************************************************/
static void MakeGMLCoordinate(char *pszTarget, double x, double y, double z,
bool b3D)
{
OGRMakeWktCoordinate(pszTarget, x, y, z, b3D ? 3 : 2);
while (*pszTarget != '\0')
{
if (*pszTarget == ' ')
*pszTarget = ',';
pszTarget++;
}
}
/************************************************************************/
/* _GrowBuffer() */
/************************************************************************/
static void _GrowBuffer(size_t nNeeded, char **ppszText, size_t *pnMaxLength)
{
if (nNeeded + 1 >= *pnMaxLength)
{
*pnMaxLength = std::max(*pnMaxLength * 2, nNeeded + 1);
*ppszText = static_cast<char *>(CPLRealloc(*ppszText, *pnMaxLength));
}
}
/************************************************************************/
/* AppendString() */
/************************************************************************/
static void AppendString(char **ppszText, size_t *pnLength, size_t *pnMaxLength,
const char *pszTextToAppend)
{
_GrowBuffer(*pnLength + strlen(pszTextToAppend) + 1, ppszText, pnMaxLength);
strcat(*ppszText + *pnLength, pszTextToAppend);
*pnLength += strlen(*ppszText + *pnLength);
}
/************************************************************************/
/* AppendCoordinateList() */
/************************************************************************/
static void AppendCoordinateList(const OGRLineString *poLine, char **ppszText,
size_t *pnLength, size_t *pnMaxLength)
{
const bool b3D = wkbHasZ(poLine->getGeometryType()) != FALSE;
*pnLength += strlen(*ppszText + *pnLength);
_GrowBuffer(*pnLength + 20, ppszText, pnMaxLength);
strcat(*ppszText + *pnLength, "<gml:coordinates>");
*pnLength += strlen(*ppszText + *pnLength);
char szCoordinate[256] = {};
for (int iPoint = 0; iPoint < poLine->getNumPoints(); iPoint++)
{
MakeGMLCoordinate(szCoordinate, poLine->getX(iPoint),
poLine->getY(iPoint), poLine->getZ(iPoint), b3D);
_GrowBuffer(*pnLength + strlen(szCoordinate) + 1, ppszText,
pnMaxLength);
if (iPoint != 0)
strcat(*ppszText + *pnLength, " ");
strcat(*ppszText + *pnLength, szCoordinate);
*pnLength += strlen(*ppszText + *pnLength);
}
_GrowBuffer(*pnLength + 20, ppszText, pnMaxLength);
strcat(*ppszText + *pnLength, "</gml:coordinates>");
*pnLength += strlen(*ppszText + *pnLength);
}
/************************************************************************/
/* OGR2GMLGeometryAppend() */
/************************************************************************/
static bool OGR2GMLGeometryAppend(const OGRGeometry *poGeometry,
char **ppszText, size_t *pnLength,
size_t *pnMaxLength, bool bIsSubGeometry,
const char *pszNamespaceDecl)
{
/* -------------------------------------------------------------------- */
/* Check for Spatial Reference System attached to given geometry */
/* -------------------------------------------------------------------- */
// Buffer for xmlns:gml and srsName attributes (srsName="...")
char szAttributes[128] = {};
size_t nAttrsLength = 0;
szAttributes[0] = 0;
const OGRSpatialReference *poSRS = poGeometry->getSpatialReference();
if (pszNamespaceDecl != nullptr)
{
snprintf(szAttributes + nAttrsLength,
sizeof(szAttributes) - nAttrsLength, " xmlns:gml=\"%s\"",
pszNamespaceDecl);
nAttrsLength += strlen(szAttributes + nAttrsLength);
pszNamespaceDecl = nullptr;
}
if (nullptr != poSRS && !bIsSubGeometry)
{
const char *pszTarget = poSRS->IsProjected() ? "PROJCS" : "GEOGCS";
const char *pszAuthName = poSRS->GetAuthorityName(pszTarget);
const char *pszAuthCode = poSRS->GetAuthorityCode(pszTarget);
if (nullptr != pszAuthName && strlen(pszAuthName) < 10 &&
nullptr != pszAuthCode && strlen(pszAuthCode) < 10)
{
snprintf(szAttributes + nAttrsLength,
sizeof(szAttributes) - nAttrsLength, " srsName=\"%s:%s\"",
pszAuthName, pszAuthCode);
nAttrsLength += strlen(szAttributes + nAttrsLength);
}
}
OGRwkbGeometryType eType = poGeometry->getGeometryType();
OGRwkbGeometryType eFType = wkbFlatten(eType);
/* -------------------------------------------------------------------- */
/* 2D Point */
/* -------------------------------------------------------------------- */
if (eType == wkbPoint)
{
const auto poPoint = poGeometry->toPoint();
char szCoordinate[256] = {};
MakeGMLCoordinate(szCoordinate, poPoint->getX(), poPoint->getY(), 0.0,
false);
_GrowBuffer(*pnLength + strlen(szCoordinate) + 60 + nAttrsLength,
ppszText, pnMaxLength);
snprintf(
*ppszText + *pnLength, *pnMaxLength - *pnLength,
"<gml:Point%s><gml:coordinates>%s</gml:coordinates></gml:Point>",
szAttributes, szCoordinate);
*pnLength += strlen(*ppszText + *pnLength);
}
/* -------------------------------------------------------------------- */
/* 3D Point */
/* -------------------------------------------------------------------- */
else if (eType == wkbPoint25D)
{
const auto poPoint = poGeometry->toPoint();
char szCoordinate[256] = {};
MakeGMLCoordinate(szCoordinate, poPoint->getX(), poPoint->getY(),
poPoint->getZ(), true);
_GrowBuffer(*pnLength + strlen(szCoordinate) + 70 + nAttrsLength,
ppszText, pnMaxLength);
snprintf(
*ppszText + *pnLength, *pnMaxLength - *pnLength,
"<gml:Point%s><gml:coordinates>%s</gml:coordinates></gml:Point>",
szAttributes, szCoordinate);
*pnLength += strlen(*ppszText + *pnLength);
}
/* -------------------------------------------------------------------- */
/* LineString and LinearRing */
/* -------------------------------------------------------------------- */
else if (eFType == wkbLineString)
{
bool bRing = EQUAL(poGeometry->getGeometryName(), "LINEARRING");
// Buffer for tag name + srsName attribute if set
const size_t nLineTagLength = 16;
const size_t nLineTagNameBufLen = nLineTagLength + nAttrsLength + 1;
char *pszLineTagName =
static_cast<char *>(CPLMalloc(nLineTagNameBufLen));
if (bRing)
{
snprintf(pszLineTagName, nLineTagNameBufLen, "<gml:LinearRing%s>",
szAttributes);
AppendString(ppszText, pnLength, pnMaxLength, pszLineTagName);
}
else
{
snprintf(pszLineTagName, nLineTagNameBufLen, "<gml:LineString%s>",
szAttributes);
AppendString(ppszText, pnLength, pnMaxLength, pszLineTagName);
}
// Free tag buffer.
CPLFree(pszLineTagName);
const auto poLineString = poGeometry->toLineString();
AppendCoordinateList(poLineString, ppszText, pnLength, pnMaxLength);
if (bRing)
AppendString(ppszText, pnLength, pnMaxLength, "</gml:LinearRing>");
else
AppendString(ppszText, pnLength, pnMaxLength, "</gml:LineString>");
}
/* -------------------------------------------------------------------- */
/* Polygon */
/* -------------------------------------------------------------------- */
else if (eFType == wkbPolygon)
{
const auto poPolygon = poGeometry->toPolygon();
// Buffer for polygon tag name + srsName attribute if set.
const size_t nPolyTagLength = 13;
const size_t nPolyTagNameBufLen = nPolyTagLength + nAttrsLength + 1;
char *pszPolyTagName =
static_cast<char *>(CPLMalloc(nPolyTagNameBufLen));
// Compose Polygon tag with or without srsName attribute.
snprintf(pszPolyTagName, nPolyTagNameBufLen, "<gml:Polygon%s>",
szAttributes);
AppendString(ppszText, pnLength, pnMaxLength, pszPolyTagName);
// Free tag buffer.
CPLFree(pszPolyTagName);
// Don't add srsName to polygon rings.
if (poPolygon->getExteriorRing() != nullptr)
{
AppendString(ppszText, pnLength, pnMaxLength,
"<gml:outerBoundaryIs>");
CPL_IGNORE_RET_VAL(
OGR2GMLGeometryAppend(poPolygon->getExteriorRing(), ppszText,
pnLength, pnMaxLength, true, nullptr));
AppendString(ppszText, pnLength, pnMaxLength,
"</gml:outerBoundaryIs>");
}
for (int iRing = 0; iRing < poPolygon->getNumInteriorRings(); iRing++)
{
const OGRLinearRing *poRing = poPolygon->getInteriorRing(iRing);
AppendString(ppszText, pnLength, pnMaxLength,
"<gml:innerBoundaryIs>");
CPL_IGNORE_RET_VAL(OGR2GMLGeometryAppend(
poRing, ppszText, pnLength, pnMaxLength, true, nullptr));
AppendString(ppszText, pnLength, pnMaxLength,
"</gml:innerBoundaryIs>");
}
AppendString(ppszText, pnLength, pnMaxLength, "</gml:Polygon>");
}
/* -------------------------------------------------------------------- */
/* MultiPolygon, MultiLineString, MultiPoint, MultiGeometry */
/* -------------------------------------------------------------------- */
else if (eFType == wkbMultiPolygon || eFType == wkbMultiLineString ||
eFType == wkbMultiPoint || eFType == wkbGeometryCollection)
{
const auto poGC = poGeometry->toGeometryCollection();
const char *pszElemClose = nullptr;
const char *pszMemberElem = nullptr;
// Buffer for opening tag + srsName attribute.
char *pszElemOpen = nullptr;
if (eFType == wkbMultiPolygon)
{
const size_t nBufLen = 13 + nAttrsLength + 1;
pszElemOpen = static_cast<char *>(CPLMalloc(nBufLen));
snprintf(pszElemOpen, nBufLen, "MultiPolygon%s>", szAttributes);
pszElemClose = "MultiPolygon>";
pszMemberElem = "polygonMember>";
}
else if (eFType == wkbMultiLineString)
{
const size_t nBufLen = 16 + nAttrsLength + 1;
pszElemOpen = static_cast<char *>(CPLMalloc(nBufLen));
snprintf(pszElemOpen, nBufLen, "MultiLineString%s>", szAttributes);
pszElemClose = "MultiLineString>";
pszMemberElem = "lineStringMember>";
}
else if (eFType == wkbMultiPoint)
{
const size_t nBufLen = 11 + nAttrsLength + 1;
pszElemOpen = static_cast<char *>(CPLMalloc(nBufLen));
snprintf(pszElemOpen, nBufLen, "MultiPoint%s>", szAttributes);
pszElemClose = "MultiPoint>";
pszMemberElem = "pointMember>";
}
else
{
const size_t nBufLen = 19 + nAttrsLength + 1;
pszElemOpen = static_cast<char *>(CPLMalloc(nBufLen));
snprintf(pszElemOpen, nBufLen, "MultiGeometry%s>", szAttributes);
pszElemClose = "MultiGeometry>";
pszMemberElem = "geometryMember>";
}
AppendString(ppszText, pnLength, pnMaxLength, "<gml:");
AppendString(ppszText, pnLength, pnMaxLength, pszElemOpen);
for (int iMember = 0; iMember < poGC->getNumGeometries(); iMember++)
{
const auto poMember = poGC->getGeometryRef(iMember);
AppendString(ppszText, pnLength, pnMaxLength, "<gml:");
AppendString(ppszText, pnLength, pnMaxLength, pszMemberElem);
if (!OGR2GMLGeometryAppend(poMember, ppszText, pnLength,
pnMaxLength, true, nullptr))
{
CPLFree(pszElemOpen);
return false;
}
AppendString(ppszText, pnLength, pnMaxLength, "</gml:");
AppendString(ppszText, pnLength, pnMaxLength, pszMemberElem);
}
AppendString(ppszText, pnLength, pnMaxLength, "</gml:");
AppendString(ppszText, pnLength, pnMaxLength, pszElemClose);
// Free tag buffer.
CPLFree(pszElemOpen);
}
else
{
CPLError(CE_Failure, CPLE_NotSupported, "Unsupported geometry type %s",
OGRGeometryTypeToName(eType));
return false;
}
return true;
}
/************************************************************************/
/* OGR_G_ExportEnvelopeToGMLTree() */
/************************************************************************/
/** Export the envelope of a geometry as a gml:Box. */
CPLXMLNode *OGR_G_ExportEnvelopeToGMLTree(OGRGeometryH hGeometry)
{
OGREnvelope sEnvelope;
OGRGeometry::FromHandle(hGeometry)->getEnvelope(&sEnvelope);
if (!sEnvelope.IsInit())
{
// TODO: There is apparently a special way of representing a null box
// geometry. Should use it here eventually.
return nullptr;
}
CPLXMLNode *psBox = CPLCreateXMLNode(nullptr, CXT_Element, "gml:Box");
/* -------------------------------------------------------------------- */
/* Add minxy coordinate. */
/* -------------------------------------------------------------------- */
CPLXMLNode *psCoord = CPLCreateXMLNode(psBox, CXT_Element, "gml:coord");
char szCoordinate[256] = {};
MakeGMLCoordinate(szCoordinate, sEnvelope.MinX, sEnvelope.MinY, 0.0, false);
char *pszY = strstr(szCoordinate, ",");
// There must be more after the comma or we have an internal consistency
// bug in MakeGMLCoordinate.
if (pszY == nullptr || strlen(pszY) < 2)
{
CPLError(CE_Failure, CPLE_AssertionFailed, "MakeGMLCoordinate failed.");
return nullptr;
}
*pszY = '\0';
pszY++;
CPLCreateXMLElementAndValue(psCoord, "gml:X", szCoordinate);
CPLCreateXMLElementAndValue(psCoord, "gml:Y", pszY);
/* -------------------------------------------------------------------- */
/* Add maxxy coordinate. */
/* -------------------------------------------------------------------- */
psCoord = CPLCreateXMLNode(psBox, CXT_Element, "gml:coord");
MakeGMLCoordinate(szCoordinate, sEnvelope.MaxX, sEnvelope.MaxY, 0.0, false);
pszY = strstr(szCoordinate, ",") + 1;
pszY[-1] = '\0';
CPLCreateXMLElementAndValue(psCoord, "gml:X", szCoordinate);
CPLCreateXMLElementAndValue(psCoord, "gml:Y", pszY);
return psBox;
}
/************************************************************************/
/* AppendGML3CoordinateList() */
/************************************************************************/
static void AppendGML3CoordinateList(const OGRSimpleCurve *poLine,
bool bCoordSwap, char **ppszText,
size_t *pnLength, size_t *pnMaxLength,
int nSRSDimensionLocFlags)
{
bool b3D = wkbHasZ(poLine->getGeometryType());
*pnLength += strlen(*ppszText + *pnLength);
_GrowBuffer(*pnLength + 40, ppszText, pnMaxLength);
if (b3D && (nSRSDimensionLocFlags & SRSDIM_LOC_POSLIST) != 0)
strcat(*ppszText + *pnLength, "<gml:posList srsDimension=\"3\">");
else
strcat(*ppszText + *pnLength, "<gml:posList>");
*pnLength += strlen(*ppszText + *pnLength);
char szCoordinate[256] = {};
for (int iPoint = 0; iPoint < poLine->getNumPoints(); iPoint++)
{
if (bCoordSwap)
OGRMakeWktCoordinate(szCoordinate, poLine->getY(iPoint),
poLine->getX(iPoint), poLine->getZ(iPoint),
b3D ? 3 : 2);
else
OGRMakeWktCoordinate(szCoordinate, poLine->getX(iPoint),
poLine->getY(iPoint), poLine->getZ(iPoint),
b3D ? 3 : 2);
_GrowBuffer(*pnLength + strlen(szCoordinate) + 1, ppszText,
pnMaxLength);
if (iPoint != 0)
strcat(*ppszText + *pnLength, " ");
strcat(*ppszText + *pnLength, szCoordinate);
*pnLength += strlen(*ppszText + *pnLength);
}
_GrowBuffer(*pnLength + 20, ppszText, pnMaxLength);
strcat(*ppszText + *pnLength, "</gml:posList>");
*pnLength += strlen(*ppszText + *pnLength);
}
/************************************************************************/
/* OGR2GML3GeometryAppend() */
/************************************************************************/
static bool OGR2GML3GeometryAppend(
const OGRGeometry *poGeometry, const OGRSpatialReference *poParentSRS,
char **ppszText, size_t *pnLength, size_t *pnMaxLength, bool bIsSubGeometry,
GMLSRSNameFormat eSRSNameFormat, bool bCoordSwap, bool bLineStringAsCurve,
const char *pszGMLId, int nSRSDimensionLocFlags,
bool bForceLineStringAsLinearRing, const char *pszNamespaceDecl,
const char *pszOverriddenElementName)
{
/* -------------------------------------------------------------------- */
/* Check for Spatial Reference System attached to given geometry */
/* -------------------------------------------------------------------- */
// Buffer for srsName, xmlns:gml, srsDimension and gml:id attributes
// (srsName="..." gml:id="...").
const OGRSpatialReference *poSRS =
poParentSRS ? poParentSRS : poGeometry->getSpatialReference();
char szAttributes[256] = {};
size_t nAttrsLength = 0;
if (pszNamespaceDecl != nullptr)
{
snprintf(szAttributes + nAttrsLength,
sizeof(szAttributes) - nAttrsLength, " xmlns:gml=\"%s\"",
pszNamespaceDecl);
pszNamespaceDecl = nullptr;
nAttrsLength += strlen(szAttributes + nAttrsLength);
}
if (nullptr != poSRS)
{
const char *pszTarget = poSRS->IsProjected() ? "PROJCS" : "GEOGCS";
const char *pszAuthName = poSRS->GetAuthorityName(pszTarget);
const char *pszAuthCode = poSRS->GetAuthorityCode(pszTarget);
if (nullptr != pszAuthName && strlen(pszAuthName) < 10 &&
nullptr != pszAuthCode && strlen(pszAuthCode) < 10)
{
if (!bIsSubGeometry)
{
if (eSRSNameFormat == SRSNAME_OGC_URN)
{
snprintf(szAttributes + nAttrsLength,
sizeof(szAttributes) - nAttrsLength,
" srsName=\"urn:ogc:def:crs:%s::%s\"", pszAuthName,
pszAuthCode);
}
else if (eSRSNameFormat == SRSNAME_SHORT)
{
snprintf(szAttributes + nAttrsLength,
sizeof(szAttributes) - nAttrsLength,
" srsName=\"%s:%s\"", pszAuthName, pszAuthCode);
}
else if (eSRSNameFormat == SRSNAME_OGC_URL)
{
snprintf(
szAttributes + nAttrsLength,
sizeof(szAttributes) - nAttrsLength,
" srsName=\"http://www.opengis.net/def/crs/%s/0/%s\"",
pszAuthName, pszAuthCode);
}
nAttrsLength += strlen(szAttributes + nAttrsLength);
}
}
}
if ((nSRSDimensionLocFlags & SRSDIM_LOC_GEOMETRY) != 0 &&
wkbHasZ(poGeometry->getGeometryType()))
{
snprintf(szAttributes + nAttrsLength,
sizeof(szAttributes) - nAttrsLength, " srsDimension=\"3\"");
nAttrsLength += strlen(szAttributes + nAttrsLength);
nSRSDimensionLocFlags &= ~SRSDIM_LOC_GEOMETRY;
}
if (pszGMLId != nullptr &&
nAttrsLength + 9 + strlen(pszGMLId) + 1 < sizeof(szAttributes))
{
snprintf(szAttributes + nAttrsLength,
sizeof(szAttributes) - nAttrsLength, " gml:id=\"%s\"",
pszGMLId);
nAttrsLength += strlen(szAttributes + nAttrsLength);
}
const OGRwkbGeometryType eType = poGeometry->getGeometryType();
const OGRwkbGeometryType eFType = wkbFlatten(eType);
/* -------------------------------------------------------------------- */
/* 2D Point */
/* -------------------------------------------------------------------- */
if (eType == wkbPoint)
{
const auto poPoint = poGeometry->toPoint();
char szCoordinate[256] = {};
if (bCoordSwap)
OGRMakeWktCoordinate(szCoordinate, poPoint->getY(), poPoint->getX(),
0.0, 2);
else
OGRMakeWktCoordinate(szCoordinate, poPoint->getX(), poPoint->getY(),
0.0, 2);
_GrowBuffer(*pnLength + strlen(szCoordinate) + 60 + nAttrsLength,
ppszText, pnMaxLength);
snprintf(*ppszText + *pnLength, *pnMaxLength - *pnLength,
"<gml:Point%s><gml:pos>%s</gml:pos></gml:Point>", szAttributes,
szCoordinate);
*pnLength += strlen(*ppszText + *pnLength);
}
/* -------------------------------------------------------------------- */
/* 3D Point */
/* -------------------------------------------------------------------- */
else if (eType == wkbPoint25D)
{
const auto poPoint = poGeometry->toPoint();
char szCoordinate[256] = {};
if (bCoordSwap)
OGRMakeWktCoordinate(szCoordinate, poPoint->getY(), poPoint->getX(),
poPoint->getZ(), 3);
else
OGRMakeWktCoordinate(szCoordinate, poPoint->getX(), poPoint->getY(),
poPoint->getZ(), 3);
_GrowBuffer(*pnLength + strlen(szCoordinate) + 70 + nAttrsLength,
ppszText, pnMaxLength);
snprintf(*ppszText + *pnLength, *pnMaxLength - *pnLength,
"<gml:Point%s><gml:pos>%s</gml:pos></gml:Point>", szAttributes,
szCoordinate);
*pnLength += strlen(*ppszText + *pnLength);
}
/* -------------------------------------------------------------------- */
/* LineString and LinearRing */
/* -------------------------------------------------------------------- */
else if (eFType == wkbLineString)
{
const bool bRing = EQUAL(poGeometry->getGeometryName(), "LINEARRING") ||
bForceLineStringAsLinearRing;
if (!bRing && bLineStringAsCurve)
{
AppendString(ppszText, pnLength, pnMaxLength, "<gml:Curve");
AppendString(ppszText, pnLength, pnMaxLength, szAttributes);
AppendString(ppszText, pnLength, pnMaxLength,
"><gml:segments><gml:LineStringSegment>");
const auto poLineString = poGeometry->toLineString();
AppendGML3CoordinateList(poLineString, bCoordSwap, ppszText,
pnLength, pnMaxLength,
nSRSDimensionLocFlags);
AppendString(ppszText, pnLength, pnMaxLength,
"</gml:LineStringSegment></gml:segments></gml:Curve>");
}
else
{
// Buffer for tag name + srsName attribute if set.
const size_t nLineTagLength = 16;
const size_t nLineTagNameBufLen = nLineTagLength + nAttrsLength + 1;
char *pszLineTagName =
static_cast<char *>(CPLMalloc(nLineTagNameBufLen));
if (bRing)
{
// LinearRing isn't supposed to have srsName attribute according
// to GML3 SF-0.
AppendString(ppszText, pnLength, pnMaxLength,
"<gml:LinearRing>");
}
else
{
snprintf(pszLineTagName, nLineTagNameBufLen,
"<gml:LineString%s>", szAttributes);
AppendString(ppszText, pnLength, pnMaxLength, pszLineTagName);
}
// Free tag buffer.
CPLFree(pszLineTagName);
const auto poLineString = poGeometry->toLineString();
AppendGML3CoordinateList(poLineString, bCoordSwap, ppszText,
pnLength, pnMaxLength,
nSRSDimensionLocFlags);
if (bRing)
AppendString(ppszText, pnLength, pnMaxLength,
"</gml:LinearRing>");
else
AppendString(ppszText, pnLength, pnMaxLength,
"</gml:LineString>");
}
}
/* -------------------------------------------------------------------- */
/* ArcString or Circle */
/* -------------------------------------------------------------------- */
else if (eFType == wkbCircularString)
{
AppendString(ppszText, pnLength, pnMaxLength, "<gml:Curve");
AppendString(ppszText, pnLength, pnMaxLength, szAttributes);
const auto poSC = poGeometry->toCircularString();
// SQL MM has a unique type for arc and circle, GML does not.
if (poSC->getNumPoints() == 3 && poSC->getX(0) == poSC->getX(2) &&
poSC->getY(0) == poSC->getY(2))
{
const double dfMidX = (poSC->getX(0) + poSC->getX(1)) / 2.0;
const double dfMidY = (poSC->getY(0) + poSC->getY(1)) / 2.0;
const double dfDirX = (poSC->getX(1) - poSC->getX(0)) / 2.0;
const double dfDirY = (poSC->getY(1) - poSC->getY(0)) / 2.0;
const double dfNormX = -dfDirY;
const double dfNormY = dfDirX;
const double dfNewX = dfMidX + dfNormX;
const double dfNewY = dfMidY + dfNormY;
OGRLineString *poLS = new OGRLineString();
OGRPoint p;
poSC->getPoint(0, &p);
poLS->addPoint(&p);
poSC->getPoint(1, &p);
if (poSC->getCoordinateDimension() == 3)
poLS->addPoint(dfNewX, dfNewY, p.getZ());
else
poLS->addPoint(dfNewX, dfNewY);
poLS->addPoint(&p);
AppendString(ppszText, pnLength, pnMaxLength,
"><gml:segments><gml:Circle>");
AppendGML3CoordinateList(poLS, bCoordSwap, ppszText, pnLength,
pnMaxLength, nSRSDimensionLocFlags);
AppendString(ppszText, pnLength, pnMaxLength,
"</gml:Circle></gml:segments></gml:Curve>");
delete poLS;
}
else
{
AppendString(ppszText, pnLength, pnMaxLength,
"><gml:segments><gml:ArcString>");
AppendGML3CoordinateList(poSC, bCoordSwap, ppszText, pnLength,
pnMaxLength, nSRSDimensionLocFlags);
AppendString(ppszText, pnLength, pnMaxLength,
"</gml:ArcString></gml:segments></gml:Curve>");
}
}
/* -------------------------------------------------------------------- */
/* CompositeCurve */
/* -------------------------------------------------------------------- */
else if (eFType == wkbCompoundCurve)
{
AppendString(ppszText, pnLength, pnMaxLength, "<gml:CompositeCurve");
AppendString(ppszText, pnLength, pnMaxLength, szAttributes);
AppendString(ppszText, pnLength, pnMaxLength, ">");
const auto poCC = poGeometry->toCompoundCurve();
for (int i = 0; i < poCC->getNumCurves(); i++)
{
AppendString(ppszText, pnLength, pnMaxLength, "<gml:curveMember>");
char *pszGMLIdSub = nullptr;
if (pszGMLId != nullptr)
pszGMLIdSub = CPLStrdup(CPLSPrintf("%s.%d", pszGMLId, i));
CPL_IGNORE_RET_VAL(OGR2GML3GeometryAppend(
poCC->getCurve(i), poSRS, ppszText, pnLength, pnMaxLength, true,
eSRSNameFormat, bCoordSwap, bLineStringAsCurve, pszGMLIdSub,
nSRSDimensionLocFlags, false, nullptr, nullptr));
CPLFree(pszGMLIdSub);
AppendString(ppszText, pnLength, pnMaxLength, "</gml:curveMember>");
}
AppendString(ppszText, pnLength, pnMaxLength, "</gml:CompositeCurve>");
}
/* -------------------------------------------------------------------- */
/* Polygon */
/* -------------------------------------------------------------------- */
else if (eFType == wkbPolygon || eFType == wkbCurvePolygon)
{
const auto poCP = poGeometry->toCurvePolygon();
// Buffer for polygon tag name + srsName attribute if set.
const char *pszElemName =
pszOverriddenElementName ? pszOverriddenElementName : "Polygon";
const size_t nPolyTagLength = 7 + strlen(pszElemName);
const size_t nPolyTagNameBufLen = nPolyTagLength + nAttrsLength + 1;
char *pszPolyTagName =
static_cast<char *>(CPLMalloc(nPolyTagNameBufLen));
// Compose Polygon tag with or without srsName attribute.
snprintf(pszPolyTagName, nPolyTagNameBufLen, "<gml:%s%s>", pszElemName,
szAttributes);
AppendString(ppszText, pnLength, pnMaxLength, pszPolyTagName);
// Free tag buffer.
CPLFree(pszPolyTagName);
const auto AppendCompoundCurveMembers =
[&](const OGRGeometry *poRing, const char *pszGMLIdRing)
{
const auto eRingType = wkbFlatten(poRing->getGeometryType());
if (eRingType == wkbCompoundCurve)
{
AppendString(ppszText, pnLength, pnMaxLength, "<gml:Ring>");
const auto poCC = poRing->toCompoundCurve();
const int nNumCurves = poCC->getNumCurves();
for (int i = 0; i < nNumCurves; i++)
{
AppendString(ppszText, pnLength, pnMaxLength,
"<gml:curveMember>");
char *pszGMLIdSub = nullptr;
if (pszGMLIdRing != nullptr)
pszGMLIdSub =
CPLStrdup(CPLSPrintf("%s.%d", pszGMLIdRing, i));
CPL_IGNORE_RET_VAL(OGR2GML3GeometryAppend(
poCC->getCurve(i), poSRS, ppszText, pnLength,
pnMaxLength, true, eSRSNameFormat, bCoordSwap,
bLineStringAsCurve, pszGMLIdSub, nSRSDimensionLocFlags,
false, nullptr, nullptr));
CPLFree(pszGMLIdSub);
AppendString(ppszText, pnLength, pnMaxLength,
"</gml:curveMember>");
}
AppendString(ppszText, pnLength, pnMaxLength, "</gml:Ring>");
}
else
{
if (eRingType != wkbLineString)
{
AppendString(ppszText, pnLength, pnMaxLength,
"<gml:Ring><gml:curveMember>");
}
CPL_IGNORE_RET_VAL(OGR2GML3GeometryAppend(
poRing, poSRS, ppszText, pnLength, pnMaxLength, true,
eSRSNameFormat, bCoordSwap, bLineStringAsCurve,
pszGMLIdRing, nSRSDimensionLocFlags, true, nullptr,
nullptr));
if (eRingType != wkbLineString)
{
AppendString(ppszText, pnLength, pnMaxLength,
"</gml:curveMember></gml:Ring>");
}
}
};
// Don't add srsName to polygon rings.
const auto poExteriorRing = poCP->getExteriorRingCurve();
if (poExteriorRing != nullptr)
{
AppendString(ppszText, pnLength, pnMaxLength, "<gml:exterior>");
AppendCompoundCurveMembers(
poExteriorRing,
pszGMLId ? (std::string(pszGMLId) + ".exterior").c_str()
: nullptr);
AppendString(ppszText, pnLength, pnMaxLength, "</gml:exterior>");
for (int iRing = 0; iRing < poCP->getNumInteriorRings(); iRing++)
{
const OGRCurve *poRing = poCP->getInteriorRingCurve(iRing);
AppendString(ppszText, pnLength, pnMaxLength, "<gml:interior>");
AppendCompoundCurveMembers(
poRing, pszGMLId ? (std::string(pszGMLId) + ".interior." +
std::to_string(iRing))
.c_str()
: nullptr);
AppendString(ppszText, pnLength, pnMaxLength,
"</gml:interior>");
}
}
AppendString(ppszText, pnLength, pnMaxLength, "</gml:");
AppendString(ppszText, pnLength, pnMaxLength, pszElemName);
AppendString(ppszText, pnLength, pnMaxLength, ">");
}
/* -------------------------------------------------------------------- */
/* Triangle */
/* -------------------------------------------------------------------- */
else if (eFType == wkbTriangle)
{
const auto poTri = poGeometry->toPolygon();
AppendString(ppszText, pnLength, pnMaxLength, "<gml:Triangle>");
if (poTri->getExteriorRingCurve() != nullptr)
{
AppendString(ppszText, pnLength, pnMaxLength, "<gml:exterior>");
CPL_IGNORE_RET_VAL(OGR2GML3GeometryAppend(
poTri->getExteriorRingCurve(), poSRS, ppszText, pnLength,
pnMaxLength, true, eSRSNameFormat, bCoordSwap,
bLineStringAsCurve, nullptr, nSRSDimensionLocFlags, true,
nullptr, nullptr));
AppendString(ppszText, pnLength, pnMaxLength, "</gml:exterior>");
}
AppendString(ppszText, pnLength, pnMaxLength, "</gml:Triangle>");
}
/* -------------------------------------------------------------------- */
/* MultiSurface, MultiCurve, MultiPoint, MultiGeometry */
/* -------------------------------------------------------------------- */
else if (eFType == wkbMultiPolygon || eFType == wkbMultiSurface ||
eFType == wkbMultiLineString || eFType == wkbMultiCurve ||
eFType == wkbMultiPoint || eFType == wkbGeometryCollection)
{
const auto poGC = poGeometry->toGeometryCollection();
const char *pszElemClose = nullptr;
const char *pszMemberElem = nullptr;
// Buffer for opening tag + srsName attribute.
char *pszElemOpen = nullptr;
if (eFType == wkbMultiPolygon || eFType == wkbMultiSurface)
{
const size_t nBufLen = 13 + nAttrsLength + 1;
pszElemOpen = static_cast<char *>(CPLMalloc(nBufLen));
snprintf(pszElemOpen, nBufLen, "MultiSurface%s>", szAttributes);
pszElemClose = "MultiSurface>";
pszMemberElem = "surfaceMember>";
}
else if (eFType == wkbMultiLineString || eFType == wkbMultiCurve)
{
const size_t nBufLen = 16 + nAttrsLength + 1;
pszElemOpen = static_cast<char *>(CPLMalloc(nBufLen));
snprintf(pszElemOpen, nBufLen, "MultiCurve%s>", szAttributes);
pszElemClose = "MultiCurve>";
pszMemberElem = "curveMember>";
}
else if (eFType == wkbMultiPoint)
{
const size_t nBufLen = 11 + nAttrsLength + 1;
pszElemOpen = static_cast<char *>(CPLMalloc(nBufLen));
snprintf(pszElemOpen, nBufLen, "MultiPoint%s>", szAttributes);
pszElemClose = "MultiPoint>";
pszMemberElem = "pointMember>";
}
else
{
const size_t nBufLen = 19 + nAttrsLength + 1;
pszElemOpen = static_cast<char *>(CPLMalloc(nBufLen));
snprintf(pszElemOpen, nBufLen, "MultiGeometry%s>", szAttributes);
pszElemClose = "MultiGeometry>";
pszMemberElem = "geometryMember>";
}