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ogrmvtdataset.cpp
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ogrmvtdataset.cpp
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/******************************************************************************
*
* Project: MVT Translator
* Purpose: Mapbox Vector Tile decoder
* Author: Even Rouault, Even Rouault <even dot rouault at spatialys dot com>
*
******************************************************************************
* Copyright (c) 2018, Even Rouault <even dot rouault at spatialys dot 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.
****************************************************************************/
#if defined(HAVE_SQLITE) && defined(HAVE_GEOS)
// Needed by mvtutils.h
#define HAVE_MVT_WRITE_SUPPORT
#endif
#include "ogrsf_frmts.h"
#include "cpl_conv.h"
#include "cpl_json.h"
#include "cpl_http.h"
#include "ogr_p.h"
#include "mvt_tile.h"
#include "mvtutils.h"
#include "ogr_geos.h"
#include "gpb.h"
#include <algorithm>
#include <memory>
#include <vector>
#include <set>
const char *SRS_EPSG_3857 =
"PROJCS[\"WGS 84 / Pseudo-Mercator\",GEOGCS[\"WGS "
"84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS "
"84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY["
"\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],"
"UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],"
"AUTHORITY[\"EPSG\",\"4326\"]],PROJECTION[\"Mercator_1SP\"],PARAMETER["
"\"central_meridian\",0],PARAMETER[\"scale_factor\",1],PARAMETER[\"false_"
"easting\",0],PARAMETER[\"false_northing\",0],UNIT[\"metre\",1,AUTHORITY["
"\"EPSG\",\"9001\"]],AXIS[\"X\",EAST],AXIS[\"Y\",NORTH],EXTENSION["
"\"PROJ4\",\"+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 "
"+x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext "
"+no_defs\"],AUTHORITY[\"EPSG\",\"3857\"]]";
// WebMercator related constants
constexpr double kmSPHERICAL_RADIUS = 6378137.0;
constexpr int knMAX_FILES_PER_DIR = 10000;
#ifdef HAVE_MVT_WRITE_SUPPORT
#include <sqlite3.h>
#include "../sqlite/ogrsqliteutility.h"
#include "../sqlite/ogrsqlitevfs.h"
#include "cpl_worker_thread_pool.h"
#include <mutex>
// Limitations from https://github.com/mapbox/mapbox-geostats
constexpr size_t knMAX_COUNT_LAYERS = 1000;
constexpr size_t knMAX_REPORT_LAYERS = 100;
constexpr size_t knMAX_COUNT_FIELDS = 1000;
constexpr size_t knMAX_REPORT_FIELDS = 100;
constexpr size_t knMAX_COUNT_VALUES = 1000;
constexpr size_t knMAX_REPORT_VALUES = 100;
constexpr size_t knMAX_STRING_VALUE_LENGTH = 256;
constexpr size_t knMAX_LAYER_NAME_LENGTH = 256;
constexpr size_t knMAX_FIELD_NAME_LENGTH = 256;
#undef SQLITE_STATIC
#define SQLITE_STATIC ((sqlite3_destructor_type) nullptr)
#endif
/************************************************************************/
/* InitWebMercatorTilingScheme() */
/************************************************************************/
static void InitWebMercatorTilingScheme(OGRSpatialReference *poSRS,
double &dfTopX, double &dfTopY,
double &dfTileDim0)
{
constexpr double kmMAX_GM =
kmSPHERICAL_RADIUS * M_PI; // 20037508.342789244
poSRS->SetFromUserInput(SRS_EPSG_3857);
dfTopX = -kmMAX_GM;
dfTopY = kmMAX_GM;
dfTileDim0 = 2 * kmMAX_GM;
}
/************************************************************************/
/* GetCmdId() */
/************************************************************************/
/* For a drawing instruction combining a command id and a command count,
* return the command id */
static unsigned GetCmdId(unsigned int nCmdCountCombined)
{
return nCmdCountCombined & 0x7;
}
/************************************************************************/
/* GetCmdCount() */
/************************************************************************/
/* For a drawing instruction combining a command id and a command count,
* return the command count */
static unsigned GetCmdCount(unsigned int nCmdCountCombined)
{
return nCmdCountCombined >> 3;
}
/************************************************************************/
/* OGRMVTLayerBase */
/************************************************************************/
class OGRMVTLayerBase CPL_NON_FINAL
: public OGRLayer,
public OGRGetNextFeatureThroughRaw<OGRMVTLayerBase>
{
virtual OGRFeature *GetNextRawFeature() = 0;
protected:
OGRFeatureDefn *m_poFeatureDefn = nullptr;
void InitFields(const CPLJSONObject &oFields,
const CPLJSONArray &oAttributesFromTileStats);
public:
virtual ~OGRMVTLayerBase();
virtual OGRFeatureDefn *GetLayerDefn() override
{
return m_poFeatureDefn;
}
DEFINE_GET_NEXT_FEATURE_THROUGH_RAW(OGRMVTLayerBase)
virtual int TestCapability(const char *) override;
};
/************************************************************************/
/* OGRMVTLayer */
/************************************************************************/
class OGRMVTDataset;
class OGRMVTLayer final : public OGRMVTLayerBase
{
OGRMVTDataset *m_poDS;
const GByte *m_pabyDataStart;
const GByte *m_pabyDataEnd;
const GByte *m_pabyDataCur = nullptr;
const GByte *m_pabyDataFeatureStart = nullptr;
bool m_bError = false;
unsigned int m_nExtent = knDEFAULT_EXTENT;
std::vector<CPLString> m_aosKeys;
typedef struct
{
OGRFieldType eType;
OGRFieldSubType eSubType;
OGRField sValue;
} Value;
std::vector<Value> m_asValues;
GIntBig m_nFID = 0;
GIntBig m_nFeatureCount = -1;
OGRPolygon m_oClipPoly;
double m_dfTileMinX = 0;
double m_dfTileMinY = 0;
double m_dfTileMaxX = 0;
double m_dfTileMaxY = 0;
bool m_bEnforceExternalIsClockwise = false;
void Init(const CPLJSONObject &oFields,
const CPLJSONArray &oAttributesFromTileStats);
bool QuickScanFeature(const GByte *pabyData,
const GByte *pabyDataFeatureEnd, bool bScanFields,
bool bScanGeometries, bool &bGeomTypeSet);
void GetXY(int nX, int nY, double &dfX, double &dfY);
OGRGeometry *ParseGeometry(unsigned int nGeomType,
const GByte *pabyDataGeometryEnd);
void SanitizeClippedGeometry(OGRGeometry *&poGeom);
virtual OGRFeature *GetNextRawFeature() override;
public:
OGRMVTLayer(OGRMVTDataset *poDS, const char *pszLayerName,
const GByte *pabyData, int nLayerSize,
const CPLJSONObject &oFields,
const CPLJSONArray &oAttributesFromTileStats,
OGRwkbGeometryType eGeomType);
virtual ~OGRMVTLayer();
virtual void ResetReading() override;
virtual GIntBig GetFeatureCount(int bForce) override;
GDALDataset *GetDataset() override;
};
/************************************************************************/
/* OGRMVTDirectoryLayer */
/************************************************************************/
class OGRMVTDirectoryLayer final : public OGRMVTLayerBase
{
OGRMVTDataset *m_poDS;
int m_nZ = 0;
bool m_bUseReadDir = true;
CPLString m_osDirName;
CPLStringList m_aosDirContent;
CPLString m_aosSubDirName;
CPLStringList m_aosSubDirContent;
bool m_bEOF = false;
int m_nXIndex = 0;
int m_nYIndex = 0;
GDALDataset *m_poCurrentTile = nullptr;
bool m_bJsonField = false;
GIntBig m_nFIDBase = 0;
OGREnvelope m_sExtent;
int m_nFilterMinX = 0;
int m_nFilterMinY = 0;
int m_nFilterMaxX = 0;
int m_nFilterMaxY = 0;
virtual OGRFeature *GetNextRawFeature() override;
OGRFeature *CreateFeatureFrom(OGRFeature *poSrcFeature);
void ReadNewSubDir();
void OpenTile();
void OpenTileIfNeeded();
public:
OGRMVTDirectoryLayer(OGRMVTDataset *poDS, const char *pszLayerName,
const char *pszDirectoryName,
const CPLJSONObject &oFields,
const CPLJSONArray &oAttributesFromTileStats,
bool bJsonField, OGRwkbGeometryType eGeomType,
const OGREnvelope *psExtent);
virtual ~OGRMVTDirectoryLayer();
virtual void ResetReading() override;
virtual GIntBig GetFeatureCount(int bForce) override;
OGRErr GetExtent(OGREnvelope *psExtent, int bForce) override;
virtual OGRErr GetExtent(int iGeomField, OGREnvelope *psExtent,
int bForce) override
{
return OGRLayer::GetExtent(iGeomField, psExtent, bForce);
}
virtual void SetSpatialFilter(OGRGeometry *) override;
virtual void SetSpatialFilter(int iGeomField, OGRGeometry *poGeom) override
{
OGRLayer::SetSpatialFilter(iGeomField, poGeom);
}
virtual OGRFeature *GetFeature(GIntBig nFID) override;
virtual int TestCapability(const char *) override;
GDALDataset *GetDataset() override;
};
/************************************************************************/
/* OGRMVTDataset */
/************************************************************************/
class OGRMVTDataset final : public GDALDataset
{
friend class OGRMVTLayer;
friend class OGRMVTDirectoryLayer;
GByte *m_pabyData;
std::vector<std::unique_ptr<OGRLayer>> m_apoLayers;
bool m_bGeoreferenced = false;
double m_dfTileDimX = 0.0;
double m_dfTileDimY = 0.0;
double m_dfTopX = 0.0;
double m_dfTopY = 0.0;
CPLString m_osMetadataMemFilename;
bool m_bClip = true;
CPLString m_osTileExtension{"pbf"};
OGRSpatialReference *m_poSRS = nullptr;
double m_dfTileDim0 = 0.0;
double m_dfTopXOrigin = 0.0;
double m_dfTopYOrigin = 0.0;
static GDALDataset *OpenDirectory(GDALOpenInfo *);
public:
explicit OGRMVTDataset(GByte *pabyData);
virtual ~OGRMVTDataset();
virtual int GetLayerCount() override
{
return static_cast<int>(m_apoLayers.size());
}
virtual OGRLayer *GetLayer(int) override;
virtual int TestCapability(const char *) override
{
return FALSE;
}
static GDALDataset *Open(GDALOpenInfo *);
OGRSpatialReference *GetSRS()
{
return m_poSRS;
}
double GetTileDim0() const
{
return m_dfTileDim0;
}
double GetTopXOrigin() const
{
return m_dfTopXOrigin;
}
double GetTopYOrigin() const
{
return m_dfTopYOrigin;
}
};
/************************************************************************/
/* ~OGRMVTLayerBase() */
/************************************************************************/
OGRMVTLayerBase::~OGRMVTLayerBase()
{
m_poFeatureDefn->Release();
}
/************************************************************************/
/* InitFields() */
/************************************************************************/
void OGRMVTLayerBase::InitFields(const CPLJSONObject &oFields,
const CPLJSONArray &oAttributesFromTileStats)
{
OGRMVTInitFields(m_poFeatureDefn, oFields, oAttributesFromTileStats);
}
/************************************************************************/
/* TestCapability() */
/************************************************************************/
int OGRMVTLayerBase::TestCapability(const char *pszCap)
{
if (EQUAL(pszCap, OLCStringsAsUTF8) || EQUAL(pszCap, OLCFastSpatialFilter))
{
return TRUE;
}
return FALSE;
}
/************************************************************************/
/* OGRMVTLayer() */
/************************************************************************/
OGRMVTLayer::OGRMVTLayer(OGRMVTDataset *poDS, const char *pszLayerName,
const GByte *pabyData, int nLayerSize,
const CPLJSONObject &oFields,
const CPLJSONArray &oAttributesFromTileStats,
OGRwkbGeometryType eGeomType)
: m_poDS(poDS), m_pabyDataStart(pabyData),
m_pabyDataEnd(pabyData + nLayerSize)
{
m_poFeatureDefn = new OGRFeatureDefn(pszLayerName);
SetDescription(m_poFeatureDefn->GetName());
m_poFeatureDefn->SetGeomType(eGeomType);
m_poFeatureDefn->Reference();
if (m_poDS->m_bGeoreferenced)
{
m_poFeatureDefn->GetGeomFieldDefn(0)->SetSpatialRef(m_poDS->GetSRS());
}
Init(oFields, oAttributesFromTileStats);
GetXY(0, 0, m_dfTileMinX, m_dfTileMaxY);
GetXY(m_nExtent, m_nExtent, m_dfTileMaxX, m_dfTileMinY);
OGRLinearRing *poLR = new OGRLinearRing();
poLR->addPoint(m_dfTileMinX, m_dfTileMinY);
poLR->addPoint(m_dfTileMinX, m_dfTileMaxY);
poLR->addPoint(m_dfTileMaxX, m_dfTileMaxY);
poLR->addPoint(m_dfTileMaxX, m_dfTileMinY);
poLR->addPoint(m_dfTileMinX, m_dfTileMinY);
m_oClipPoly.addRingDirectly(poLR);
// Config option only for tests for now. When set, it ensures that
// the first ring (exterior ring) of a polygon is clockwise oriented,
// as per the MVT spec.
// By default, we are more tolerant and only use reversal of winding order
// to detect inner rings.
m_bEnforceExternalIsClockwise = CPLTestBool(
CPLGetConfigOption("OGR_MVT_ENFORE_EXTERNAL_RING_IS_CLOCKWISE", "NO"));
}
/************************************************************************/
/* ~OGRMVTLayer() */
/************************************************************************/
OGRMVTLayer::~OGRMVTLayer()
{
for (auto &sValue : m_asValues)
{
if (sValue.eType == OFTString)
{
CPLFree(sValue.sValue.String);
}
}
}
/************************************************************************/
/* Init() */
/************************************************************************/
void OGRMVTLayer::Init(const CPLJSONObject &oFields,
const CPLJSONArray &oAttributesFromTileStats)
{
// First pass to collect keys and values
const GByte *pabyData = m_pabyDataStart;
const GByte *pabyDataLimit = m_pabyDataEnd;
unsigned int nKey = 0;
bool bGeomTypeSet = false;
const bool bScanFields = !oFields.IsValid();
const bool bScanGeometries = m_poFeatureDefn->GetGeomType() == wkbUnknown;
const bool bQuickScanFeature = bScanFields || bScanGeometries;
try
{
while (pabyData < pabyDataLimit)
{
READ_FIELD_KEY(nKey);
if (nKey == MAKE_KEY(knLAYER_KEYS, WT_DATA))
{
char *pszKey = nullptr;
READ_TEXT(pabyData, pabyDataLimit, pszKey);
m_aosKeys.push_back(pszKey);
CPLFree(pszKey);
}
else if (nKey == MAKE_KEY(knLAYER_VALUES, WT_DATA))
{
unsigned int nValueLength = 0;
READ_SIZE(pabyData, pabyDataLimit, nValueLength);
const GByte *pabyDataValueEnd = pabyData + nValueLength;
READ_VARUINT32(pabyData, pabyDataLimit, nKey);
if (nKey == MAKE_KEY(knVALUE_STRING, WT_DATA))
{
char *pszValue = nullptr;
READ_TEXT(pabyData, pabyDataLimit, pszValue);
Value sValue;
sValue.eType = OFTString;
sValue.eSubType = OFSTNone;
sValue.sValue.String = pszValue;
m_asValues.push_back(sValue);
}
else if (nKey == MAKE_KEY(knVALUE_FLOAT, WT_32BIT))
{
Value sValue;
sValue.eType = OFTReal;
sValue.eSubType = OFSTFloat32;
sValue.sValue.Real = ReadFloat32(&pabyData, pabyDataLimit);
m_asValues.push_back(sValue);
}
else if (nKey == MAKE_KEY(knVALUE_DOUBLE, WT_64BIT))
{
Value sValue;
sValue.eType = OFTReal;
sValue.eSubType = OFSTNone;
sValue.sValue.Real = ReadFloat64(&pabyData, pabyDataLimit);
m_asValues.push_back(sValue);
}
else if (nKey == MAKE_KEY(knVALUE_INT, WT_VARINT))
{
GIntBig nVal = 0;
READ_VARINT64(pabyData, pabyDataLimit, nVal);
Value sValue;
sValue.eType = (nVal >= INT_MIN && nVal <= INT_MAX)
? OFTInteger
: OFTInteger64;
sValue.eSubType = OFSTNone;
if (sValue.eType == OFTInteger)
sValue.sValue.Integer = static_cast<int>(nVal);
else
sValue.sValue.Integer64 = nVal;
m_asValues.push_back(sValue);
}
else if (nKey == MAKE_KEY(knVALUE_UINT, WT_VARINT))
{
GUIntBig nVal = 0;
READ_VARUINT64(pabyData, pabyDataLimit, nVal);
Value sValue;
sValue.eType =
(nVal <= INT_MAX) ? OFTInteger : OFTInteger64;
sValue.eSubType = OFSTNone;
if (sValue.eType == OFTInteger)
sValue.sValue.Integer = static_cast<int>(nVal);
else
sValue.sValue.Integer64 = static_cast<GIntBig>(nVal);
m_asValues.push_back(sValue);
}
else if (nKey == MAKE_KEY(knVALUE_SINT, WT_VARINT))
{
GIntBig nVal = 0;
READ_VARSINT64(pabyData, pabyDataLimit, nVal);
Value sValue;
sValue.eType = (nVal >= INT_MIN && nVal <= INT_MAX)
? OFTInteger
: OFTInteger64;
sValue.eSubType = OFSTNone;
if (sValue.eType == OFTInteger)
sValue.sValue.Integer = static_cast<int>(nVal);
else
sValue.sValue.Integer64 = nVal;
m_asValues.push_back(sValue);
}
else if (nKey == MAKE_KEY(knVALUE_BOOL, WT_VARINT))
{
unsigned nVal = 0;
READ_VARUINT32(pabyData, pabyDataLimit, nVal);
Value sValue;
sValue.eType = OFTInteger;
sValue.eSubType = OFSTBoolean;
sValue.sValue.Integer = static_cast<int>(nVal);
m_asValues.push_back(sValue);
}
pabyData = pabyDataValueEnd;
}
else if (nKey == MAKE_KEY(knLAYER_EXTENT, WT_VARINT))
{
GUInt32 nExtent = 0;
READ_VARUINT32(pabyData, pabyDataLimit, nExtent);
m_nExtent = std::max(1U, nExtent); // to avoid divide by zero
}
else
{
SKIP_UNKNOWN_FIELD(pabyData, pabyDataLimit, FALSE);
}
}
InitFields(oFields, oAttributesFromTileStats);
m_nFeatureCount = 0;
pabyData = m_pabyDataStart;
// Second pass to iterate over features to figure out the geometry type
// and attribute schema
while (pabyData < pabyDataLimit)
{
const GByte *pabyDataBefore = pabyData;
READ_FIELD_KEY(nKey);
if (nKey == MAKE_KEY(knLAYER_FEATURES, WT_DATA))
{
if (m_pabyDataFeatureStart == nullptr)
{
m_pabyDataFeatureStart = pabyDataBefore;
m_pabyDataCur = pabyDataBefore;
}
unsigned int nFeatureLength = 0;
READ_SIZE(pabyData, pabyDataLimit, nFeatureLength);
const GByte *pabyDataFeatureEnd = pabyData + nFeatureLength;
if (bQuickScanFeature)
{
if (!QuickScanFeature(pabyData, pabyDataFeatureEnd,
bScanFields, bScanGeometries,
bGeomTypeSet))
{
return;
}
}
pabyData = pabyDataFeatureEnd;
m_nFeatureCount++;
}
else
{
SKIP_UNKNOWN_FIELD(pabyData, pabyDataLimit, FALSE);
}
}
}
catch (const GPBException &e)
{
CPLError(CE_Failure, CPLE_AppDefined, "%s", e.what());
}
}
/************************************************************************/
/* MergeFieldDefn() */
/************************************************************************/
static void MergeFieldDefn(OGRFieldDefn *poFieldDefn, OGRFieldType eSrcType,
OGRFieldSubType eSrcSubType)
{
if (eSrcType == OFTString)
{
poFieldDefn->SetSubType(OFSTNone);
poFieldDefn->SetType(OFTString);
}
else if (poFieldDefn->GetType() == OFTInteger && eSrcType == OFTInteger64)
{
poFieldDefn->SetSubType(OFSTNone);
poFieldDefn->SetType(OFTInteger64);
}
else if ((poFieldDefn->GetType() == OFTInteger ||
poFieldDefn->GetType() == OFTInteger64) &&
eSrcType == OFTReal)
{
poFieldDefn->SetSubType(OFSTNone);
poFieldDefn->SetType(OFTReal);
poFieldDefn->SetSubType(eSrcSubType);
}
else if (poFieldDefn->GetType() == OFTReal && eSrcType == OFTReal &&
eSrcSubType == OFSTNone)
{
poFieldDefn->SetSubType(OFSTNone);
}
else if (poFieldDefn->GetType() == OFTInteger && eSrcType == OFTInteger &&
eSrcSubType == OFSTNone)
{
poFieldDefn->SetSubType(OFSTNone);
}
}
/************************************************************************/
/* QuickScanFeature() */
/************************************************************************/
bool OGRMVTLayer::QuickScanFeature(const GByte *pabyData,
const GByte *pabyDataFeatureEnd,
bool bScanFields, bool bScanGeometries,
bool &bGeomTypeSet)
{
unsigned int nKey = 0;
unsigned int nGeomType = 0;
try
{
while (pabyData < pabyDataFeatureEnd)
{
READ_VARUINT32(pabyData, pabyDataFeatureEnd, nKey);
if (nKey == MAKE_KEY(knFEATURE_TYPE, WT_VARINT))
{
READ_VARUINT32(pabyData, pabyDataFeatureEnd, nGeomType);
}
else if (nKey == MAKE_KEY(knFEATURE_TAGS, WT_DATA) && bScanFields)
{
unsigned int nTagsSize = 0;
READ_SIZE(pabyData, pabyDataFeatureEnd, nTagsSize);
const GByte *pabyDataTagsEnd = pabyData + nTagsSize;
while (pabyData < pabyDataTagsEnd)
{
unsigned int nKeyIdx = 0;
unsigned int nValIdx = 0;
READ_VARUINT32(pabyData, pabyDataTagsEnd, nKeyIdx);
READ_VARUINT32(pabyData, pabyDataTagsEnd, nValIdx);
if (nKeyIdx >= m_aosKeys.size())
{
CPLError(CE_Failure, CPLE_AppDefined,
"Invalid tag key index: %u", nKeyIdx);
m_bError = true;
return false;
}
if (nValIdx >= m_asValues.size())
{
CPLError(CE_Failure, CPLE_AppDefined,
"Invalid tag value index: %u", nValIdx);
m_bError = true;
return false;
}
const int nFieldIdx =
m_poFeatureDefn->GetFieldIndex(m_aosKeys[nKeyIdx]);
if (nFieldIdx < 0)
{
OGRFieldDefn oFieldDefn(m_aosKeys[nKeyIdx],
m_asValues[nValIdx].eType);
oFieldDefn.SetSubType(m_asValues[nValIdx].eSubType);
m_poFeatureDefn->AddFieldDefn(&oFieldDefn);
}
else if (m_poFeatureDefn->GetFieldDefn(nFieldIdx)
->GetType() != m_asValues[nValIdx].eType ||
m_poFeatureDefn->GetFieldDefn(nFieldIdx)
->GetSubType() !=
m_asValues[nValIdx].eSubType)
{
OGRFieldDefn *poFieldDefn =
m_poFeatureDefn->GetFieldDefn(nFieldIdx);
OGRFieldType eSrcType(m_asValues[nValIdx].eType);
OGRFieldSubType eSrcSubType(
m_asValues[nValIdx].eSubType);
MergeFieldDefn(poFieldDefn, eSrcType, eSrcSubType);
}
}
}
else if (nKey == MAKE_KEY(knFEATURE_GEOMETRY, WT_DATA) &&
bScanGeometries && nGeomType >= knGEOM_TYPE_POINT &&
nGeomType <= knGEOM_TYPE_POLYGON)
{
unsigned int nGeometrySize = 0;
READ_SIZE(pabyData, pabyDataFeatureEnd, nGeometrySize);
const GByte *pabyDataGeometryEnd = pabyData + nGeometrySize;
OGRwkbGeometryType eType = wkbUnknown;
if (nGeomType == knGEOM_TYPE_POINT)
{
eType = wkbPoint;
unsigned int nCmdCountCombined = 0;
READ_VARUINT32(pabyData, pabyDataGeometryEnd,
nCmdCountCombined);
if (GetCmdId(nCmdCountCombined) == knCMD_MOVETO &&
GetCmdCount(nCmdCountCombined) > 1)
{
eType = wkbMultiPoint;
}
}
else if (nGeomType == knGEOM_TYPE_LINESTRING)
{
eType = wkbLineString;
for (int iIter = 0; pabyData < pabyDataGeometryEnd; iIter++)
{
if (iIter == 1)
{
eType = wkbMultiLineString;
break;
}
unsigned int nCmdCountCombined = 0;
unsigned int nLineToCount;
// Should be a moveto
SKIP_VARINT(pabyData, pabyDataGeometryEnd);
SKIP_VARINT(pabyData, pabyDataGeometryEnd);
SKIP_VARINT(pabyData, pabyDataGeometryEnd);
READ_VARUINT32(pabyData, pabyDataGeometryEnd,
nCmdCountCombined);
nLineToCount = GetCmdCount(nCmdCountCombined);
for (unsigned i = 0; i < 2 * nLineToCount; i++)
{
SKIP_VARINT(pabyData, pabyDataGeometryEnd);
}
}
}
else /* if( nGeomType == knGEOM_TYPE_POLYGON ) */
{
eType = wkbPolygon;
for (int iIter = 0; pabyData < pabyDataGeometryEnd; iIter++)
{
if (iIter == 1)
{
eType = wkbMultiPolygon;
break;
}
unsigned int nCmdCountCombined = 0;
unsigned int nLineToCount;
// Should be a moveto
SKIP_VARINT(pabyData, pabyDataGeometryEnd);
SKIP_VARINT(pabyData, pabyDataGeometryEnd);
SKIP_VARINT(pabyData, pabyDataGeometryEnd);
READ_VARUINT32(pabyData, pabyDataGeometryEnd,
nCmdCountCombined);
nLineToCount = GetCmdCount(nCmdCountCombined);
for (unsigned i = 0; i < 2 * nLineToCount; i++)
{
SKIP_VARINT(pabyData, pabyDataGeometryEnd);
}
// Should be a closepath
SKIP_VARINT(pabyData, pabyDataGeometryEnd);
}
}
if (bGeomTypeSet && m_poFeatureDefn->GetGeomType() ==
OGR_GT_GetCollection(eType))
{
// do nothing
}
else if (bGeomTypeSet &&
eType == OGR_GT_GetCollection(
m_poFeatureDefn->GetGeomType()))
{
m_poFeatureDefn->SetGeomType(eType);
}
else if (bGeomTypeSet &&
m_poFeatureDefn->GetGeomType() != eType)
{
m_poFeatureDefn->SetGeomType(wkbUnknown);
}
else
{
m_poFeatureDefn->SetGeomType(eType);
}
bGeomTypeSet = true;
pabyData = pabyDataGeometryEnd;
}
else
{
SKIP_UNKNOWN_FIELD(pabyData, pabyDataFeatureEnd, FALSE);
}
}
return true;
}
catch (const GPBException &e)
{
CPLError(CE_Failure, CPLE_AppDefined, "%s", e.what());
return false;
}
}
/************************************************************************/
/* GetFeatureCount() */
/************************************************************************/
GIntBig OGRMVTLayer::GetFeatureCount(int bForce)
{
if (m_poFilterGeom == nullptr && m_poAttrQuery == nullptr &&
m_nFeatureCount >= 0)
{
return m_nFeatureCount;
}
return OGRLayer::GetFeatureCount(bForce);
}
/************************************************************************/
/* ResetReading() */
/************************************************************************/
void OGRMVTLayer::ResetReading()
{
m_nFID = 0;
m_pabyDataCur = m_pabyDataFeatureStart;
}
/************************************************************************/
/* GetXY() */
/************************************************************************/
void OGRMVTLayer::GetXY(int nX, int nY, double &dfX, double &dfY)
{
if (m_poDS->m_bGeoreferenced)
{
dfX = m_poDS->m_dfTopX + nX * m_poDS->m_dfTileDimX / m_nExtent;
dfY = m_poDS->m_dfTopY - nY * m_poDS->m_dfTileDimY / m_nExtent;
}
else
{
dfX = nX;
dfY = static_cast<double>(m_nExtent) - nY;
}
}
/************************************************************************/
/* AddWithOverflowAccepted() */
/************************************************************************/
CPL_NOSANITIZE_UNSIGNED_INT_OVERFLOW
static int AddWithOverflowAccepted(int a, int b)
{
// In fact in normal situations a+b should not overflow. That can only
// happen with corrupted datasets. But we don't really want to add code
// to detect that situation, so basically this is just a trick to perform
// the addition without the various sanitizers to yell about the overflow.
//
// Assumes complement-to-two signed integer representation and that
// the compiler will safely cast a big unsigned to negative integer.
return static_cast<int>(static_cast<unsigned>(a) +
static_cast<unsigned>(b));
}
/************************************************************************/
/* ParseGeometry() */
/************************************************************************/
OGRGeometry *OGRMVTLayer::ParseGeometry(unsigned int nGeomType,
const GByte *pabyDataGeometryEnd)
{
OGRMultiPoint *poMultiPoint = nullptr;
OGRMultiLineString *poMultiLS = nullptr;
OGRLineString *poLine = nullptr;
OGRMultiPolygon *poMultiPoly = nullptr;
OGRPolygon *poPoly = nullptr;
OGRLinearRing *poRing = nullptr;
try
{
if (nGeomType == knGEOM_TYPE_POINT)
{
unsigned int nCmdCountCombined = 0;
unsigned int nCount;
READ_VARUINT32(m_pabyDataCur, pabyDataGeometryEnd,
nCmdCountCombined);
nCount = GetCmdCount(nCmdCountCombined);
if (GetCmdId(nCmdCountCombined) == knCMD_MOVETO && nCount == 1)
{
int nX = 0;
int nY = 0;
READ_VARSINT32(m_pabyDataCur, pabyDataGeometryEnd, nX);
READ_VARSINT32(m_pabyDataCur, pabyDataGeometryEnd, nY);
double dfX;
double dfY;
GetXY(nX, nY, dfX, dfY);
OGRPoint *poPoint = new OGRPoint(dfX, dfY);
if (m_poFeatureDefn->GetGeomType() == wkbMultiPoint)
{
poMultiPoint = new OGRMultiPoint();
poMultiPoint->addGeometryDirectly(poPoint);
return poMultiPoint;
}
else
{
return poPoint;
}
}
else if (GetCmdId(nCmdCountCombined) == knCMD_MOVETO && nCount > 1)
{
int nX = 0;
int nY = 0;
poMultiPoint = new OGRMultiPoint();
for (unsigned i = 0; i < nCount; i++)
{
int nDX = 0;
int nDY = 0;
READ_VARSINT32(m_pabyDataCur, pabyDataGeometryEnd, nDX);
READ_VARSINT32(m_pabyDataCur, pabyDataGeometryEnd, nDY);
// if( nDX != 0 || nDY != 0 )
{
nX = AddWithOverflowAccepted(nX, nDX);
nY = AddWithOverflowAccepted(nY, nDY);
double dfX;
double dfY;
GetXY(nX, nY, dfX, dfY);
OGRPoint *poPoint = new OGRPoint(dfX, dfY);
if (i == 0 && nCount == 2 &&
m_pabyDataCur == pabyDataGeometryEnd)
{
// Current versions of Mapserver at time of writing
// wrongly encode a point with nCount = 2
static bool bWarned = false;
if (!bWarned)
{
CPLDebug(
"MVT",
"Reading likely a broken point as "
"produced by some versions of Mapserver");
bWarned = true;
}
delete poMultiPoint;
return poPoint;
}
poMultiPoint->addGeometryDirectly(poPoint);
}
}
return poMultiPoint;
}
}
else if (nGeomType == knGEOM_TYPE_LINESTRING)
{
int nX = 0;
int nY = 0;
while (m_pabyDataCur < pabyDataGeometryEnd)
{
unsigned int nCmdCountCombined = 0;
unsigned int nLineToCount;
// Should be a moveto
SKIP_VARINT(m_pabyDataCur, pabyDataGeometryEnd);
int nDX = 0;
int nDY = 0;
READ_VARSINT32(m_pabyDataCur, pabyDataGeometryEnd, nDX);
READ_VARSINT32(m_pabyDataCur, pabyDataGeometryEnd, nDY);
nX = AddWithOverflowAccepted(nX, nDX);
nY = AddWithOverflowAccepted(nY, nDY);