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ogr_wkb.cpp
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/******************************************************************************
*
* Project: OGR
* Purpose: WKB geometry related methods
* Author: Even Rouault <even dot rouault at spatialys.com>
*
******************************************************************************
* Copyright (c) 2022, 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 "cpl_error.h"
#include "ogr_wkb.h"
#include "ogr_core.h"
#include "ogr_geometry.h"
#include "ogr_p.h"
#include <algorithm>
#include <cmath>
#include <climits>
#include <limits>
#include <algorithm>
#include <limits>
#define USE_FAST_FLOAT
#ifdef USE_FAST_FLOAT
#include "include_fast_float.h"
#endif
/************************************************************************/
/* OGRWKBNeedSwap() */
/************************************************************************/
static inline bool OGRWKBNeedSwap(GByte b)
{
#if CPL_IS_LSB
const bool bNeedSwap = b == 0;
#else
const bool bNeedSwap = b == 1;
#endif
return bNeedSwap;
}
/************************************************************************/
/* OGRWKBReadUInt32() */
/************************************************************************/
static inline uint32_t OGRWKBReadUInt32(const GByte *pabyWkb, bool bNeedSwap)
{
uint32_t nVal;
memcpy(&nVal, pabyWkb, sizeof(nVal));
if (bNeedSwap)
CPL_SWAP32PTR(&nVal);
return nVal;
}
/************************************************************************/
/* OGRWKBReadFloat64() */
/************************************************************************/
static inline double OGRWKBReadFloat64(const GByte *pabyWkb, bool bNeedSwap)
{
double dfVal;
memcpy(&dfVal, pabyWkb, sizeof(dfVal));
if (bNeedSwap)
CPL_SWAP64PTR(&dfVal);
return dfVal;
}
/************************************************************************/
/* OGRWKBRingGetArea() */
/************************************************************************/
static bool OGRWKBRingGetArea(const GByte *&pabyWkb, size_t &nWKBSize, int nDim,
bool bNeedSwap, double &dfArea)
{
const uint32_t nPoints = OGRWKBReadUInt32(pabyWkb, bNeedSwap);
if (nPoints >= 4 &&
(nWKBSize - sizeof(uint32_t)) / (nDim * sizeof(double)) >= nPoints)
{
nWKBSize -= sizeof(uint32_t) + nDim * sizeof(double);
pabyWkb += sizeof(uint32_t);
// Computation according to Green's Theorem
// Cf OGRSimpleCurve::get_LinearArea()
double x_m1 = OGRWKBReadFloat64(pabyWkb, bNeedSwap);
double y_m1 = OGRWKBReadFloat64(pabyWkb + sizeof(double), bNeedSwap);
double y_m2 = y_m1;
dfArea = 0;
pabyWkb += nDim * sizeof(double);
for (uint32_t i = 1; i < nPoints; ++i)
{
const double x = OGRWKBReadFloat64(pabyWkb, bNeedSwap);
const double y =
OGRWKBReadFloat64(pabyWkb + sizeof(double), bNeedSwap);
pabyWkb += nDim * sizeof(double);
dfArea += x_m1 * (y - y_m2);
y_m2 = y_m1;
x_m1 = x;
y_m1 = y;
}
dfArea += x_m1 * (y_m1 - y_m2);
dfArea = 0.5 * std::fabs(dfArea);
return true;
}
return false;
}
/************************************************************************/
/* OGRWKBGetGeomType() */
/************************************************************************/
bool OGRWKBGetGeomType(const GByte *pabyWkb, size_t nWKBSize, bool &bNeedSwap,
uint32_t &nType)
{
if (nWKBSize >= 5)
{
bNeedSwap = OGRWKBNeedSwap(pabyWkb[0]);
nType = OGRWKBReadUInt32(pabyWkb + 1, bNeedSwap);
return true;
}
return false;
}
/************************************************************************/
/* OGRWKBPolygonGetArea() */
/************************************************************************/
bool OGRWKBPolygonGetArea(const GByte *&pabyWkb, size_t &nWKBSize,
double &dfArea)
{
bool bNeedSwap;
uint32_t nType;
if (nWKBSize < 9 || !OGRWKBGetGeomType(pabyWkb, nWKBSize, bNeedSwap, nType))
return false;
int nDims = 2;
if (nType == wkbPolygon)
{
// do nothing
}
else if (nType == wkbPolygon + 1000 || // wkbPolygonZ
nType == wkbPolygon25D || nType == wkbPolygonM)
{
nDims = 3;
}
else if (nType == wkbPolygonZM)
{
nDims = 4;
}
else
{
return false;
}
const uint32_t nRings = OGRWKBReadUInt32(pabyWkb + 5, bNeedSwap);
if ((nWKBSize - 9) / sizeof(uint32_t) >= nRings)
{
pabyWkb += 9;
nWKBSize -= 9;
dfArea = 0;
if (nRings > 0)
{
if (!OGRWKBRingGetArea(pabyWkb, nWKBSize, nDims, bNeedSwap, dfArea))
return false;
for (uint32_t i = 1; i < nRings; ++i)
{
double dfRingArea;
if (!OGRWKBRingGetArea(pabyWkb, nWKBSize, nDims, bNeedSwap,
dfRingArea))
return false;
dfArea -= dfRingArea;
}
}
return true;
}
return false;
}
/************************************************************************/
/* OGRWKBMultiPolygonGetArea() */
/************************************************************************/
bool OGRWKBMultiPolygonGetArea(const GByte *&pabyWkb, size_t &nWKBSize,
double &dfArea)
{
if (nWKBSize < 9)
return false;
const bool bNeedSwap = OGRWKBNeedSwap(pabyWkb[0]);
const uint32_t nPolys = OGRWKBReadUInt32(pabyWkb + 5, bNeedSwap);
if ((nWKBSize - 9) / 9 >= nPolys)
{
pabyWkb += 9;
nWKBSize -= 9;
dfArea = 0;
for (uint32_t i = 0; i < nPolys; ++i)
{
double dfPolyArea;
if (!OGRWKBPolygonGetArea(pabyWkb, nWKBSize, dfPolyArea))
return false;
dfArea += dfPolyArea;
}
return true;
}
return false;
}
/************************************************************************/
/* WKBFromEWKB() */
/************************************************************************/
const GByte *WKBFromEWKB(GByte *pabyEWKB, size_t nEWKBSize, size_t &nWKBSizeOut,
int *pnSRIDOut)
{
if (nEWKBSize < 5U)
{
CPLError(CE_Failure, CPLE_AppDefined, "Invalid EWKB content : %u bytes",
static_cast<unsigned>(nEWKBSize));
return nullptr;
}
const GByte *pabyWKB = pabyEWKB;
/* -------------------------------------------------------------------- */
/* PostGIS EWKB format includes an SRID, but this won't be */
/* understood by OGR, so if the SRID flag is set, we remove the */
/* SRID (bytes at offset 5 to 8). */
/* -------------------------------------------------------------------- */
if (nEWKBSize > 9 &&
((pabyEWKB[0] == 0 /* big endian */ && (pabyEWKB[1] & 0x20)) ||
(pabyEWKB[0] != 0 /* little endian */ && (pabyEWKB[4] & 0x20))))
{
if (pnSRIDOut)
{
memcpy(pnSRIDOut, pabyEWKB + 5, 4);
const OGRwkbByteOrder eByteOrder =
(pabyEWKB[0] == 0 ? wkbXDR : wkbNDR);
if (OGR_SWAP(eByteOrder))
*pnSRIDOut = CPL_SWAP32(*pnSRIDOut);
}
// Drop the SRID flag
if (pabyEWKB[0] == 0)
pabyEWKB[1] &= (~0x20);
else
pabyEWKB[4] &= (~0x20);
// Move 5 first bytes of EWKB 4 bytes later to create regular WKB
memmove(pabyEWKB + 4, pabyEWKB, 5);
memset(pabyEWKB, 0, 4);
// and make pabyWKB point to that
pabyWKB += 4;
nWKBSizeOut = nEWKBSize - 4;
}
else
{
if (pnSRIDOut)
{
*pnSRIDOut = INT_MIN;
}
nWKBSizeOut = nEWKBSize;
}
return pabyWKB;
}
/************************************************************************/
/* OGRWKBReadUInt32AtOffset() */
/************************************************************************/
static uint32_t OGRWKBReadUInt32AtOffset(const uint8_t *data,
OGRwkbByteOrder eByteOrder,
size_t &iOffset)
{
uint32_t v;
memcpy(&v, data + iOffset, sizeof(v));
iOffset += sizeof(v);
if (OGR_SWAP(eByteOrder))
{
CPL_SWAP32PTR(&v);
}
return v;
}
/************************************************************************/
/* ReadWKBPointSequence() */
/************************************************************************/
template <bool INCLUDE_Z, typename EnvelopeType>
static bool ReadWKBPointSequence(const uint8_t *data, size_t size,
OGRwkbByteOrder eByteOrder, int nDim,
bool bHasZ, size_t &iOffset,
EnvelopeType &sEnvelope)
{
const uint32_t nPoints =
OGRWKBReadUInt32AtOffset(data, eByteOrder, iOffset);
if (nPoints > (size - iOffset) / (nDim * sizeof(double)))
return false;
double dfX = 0;
double dfY = 0;
[[maybe_unused]] double dfZ = 0;
for (uint32_t j = 0; j < nPoints; j++)
{
memcpy(&dfX, data + iOffset, sizeof(double));
memcpy(&dfY, data + iOffset + sizeof(double), sizeof(double));
if constexpr (INCLUDE_Z)
{
if (bHasZ)
memcpy(&dfZ, data + iOffset + 2 * sizeof(double),
sizeof(double));
}
iOffset += nDim * sizeof(double);
if (OGR_SWAP(eByteOrder))
{
CPL_SWAP64PTR(&dfX);
CPL_SWAP64PTR(&dfY);
if constexpr (INCLUDE_Z)
{
CPL_SWAP64PTR(&dfZ);
}
}
sEnvelope.MinX = std::min(sEnvelope.MinX, dfX);
sEnvelope.MinY = std::min(sEnvelope.MinY, dfY);
sEnvelope.MaxX = std::max(sEnvelope.MaxX, dfX);
sEnvelope.MaxY = std::max(sEnvelope.MaxY, dfY);
if constexpr (INCLUDE_Z)
{
if (bHasZ)
{
sEnvelope.MinZ = std::min(sEnvelope.MinZ, dfZ);
sEnvelope.MaxZ = std::max(sEnvelope.MaxZ, dfZ);
}
}
}
return true;
}
/************************************************************************/
/* ReadWKBRingSequence() */
/************************************************************************/
template <bool INCLUDE_Z, typename EnvelopeType>
static bool ReadWKBRingSequence(const uint8_t *data, size_t size,
OGRwkbByteOrder eByteOrder, int nDim,
bool bHasZ, size_t &iOffset,
EnvelopeType &sEnvelope)
{
const uint32_t nRings = OGRWKBReadUInt32AtOffset(data, eByteOrder, iOffset);
if (nRings > (size - iOffset) / sizeof(uint32_t))
return false;
for (uint32_t i = 0; i < nRings; i++)
{
if (iOffset + sizeof(uint32_t) > size)
return false;
if (!ReadWKBPointSequence<INCLUDE_Z>(data, size, eByteOrder, nDim,
bHasZ, iOffset, sEnvelope))
return false;
}
return true;
}
/************************************************************************/
/* OGRWKBGetBoundingBox() */
/************************************************************************/
constexpr uint32_t WKB_PREFIX_SIZE = 1 + sizeof(uint32_t);
constexpr uint32_t MIN_WKB_SIZE = WKB_PREFIX_SIZE + sizeof(uint32_t);
template <bool INCLUDE_Z, typename EnvelopeType>
static bool OGRWKBGetBoundingBox(const uint8_t *data, size_t size,
size_t &iOffset, EnvelopeType &sEnvelope,
int nRec)
{
if (size - iOffset < MIN_WKB_SIZE)
return false;
const int nByteOrder = DB2_V72_FIX_BYTE_ORDER(data[iOffset]);
if (!(nByteOrder == wkbXDR || nByteOrder == wkbNDR))
return false;
const OGRwkbByteOrder eByteOrder = static_cast<OGRwkbByteOrder>(nByteOrder);
OGRwkbGeometryType eGeometryType = wkbUnknown;
OGRReadWKBGeometryType(data + iOffset, wkbVariantIso, &eGeometryType);
iOffset += 5;
const auto eFlatType = wkbFlatten(eGeometryType);
const bool bHasZ = CPL_TO_BOOL(OGR_GT_HasZ(eGeometryType));
const int nDim = 2 + (bHasZ ? 1 : 0) + (OGR_GT_HasM(eGeometryType) ? 1 : 0);
if (eFlatType == wkbPoint)
{
if (size - iOffset < nDim * sizeof(double))
return false;
double dfX = 0;
double dfY = 0;
[[maybe_unused]] double dfZ = 0;
memcpy(&dfX, data + iOffset, sizeof(double));
memcpy(&dfY, data + iOffset + sizeof(double), sizeof(double));
if constexpr (INCLUDE_Z)
{
if (bHasZ)
memcpy(&dfZ, data + iOffset + 2 * sizeof(double),
sizeof(double));
}
iOffset += nDim * sizeof(double);
if (OGR_SWAP(eByteOrder))
{
CPL_SWAP64PTR(&dfX);
CPL_SWAP64PTR(&dfY);
if constexpr (INCLUDE_Z)
{
CPL_SWAP64PTR(&dfZ);
}
}
if (std::isnan(dfX))
{
// Point empty
sEnvelope = EnvelopeType();
}
else
{
sEnvelope.MinX = dfX;
sEnvelope.MinY = dfY;
sEnvelope.MaxX = dfX;
sEnvelope.MaxY = dfY;
if constexpr (INCLUDE_Z)
{
if (bHasZ)
{
sEnvelope.MinZ = dfZ;
sEnvelope.MaxZ = dfZ;
}
}
}
return true;
}
if (eFlatType == wkbLineString || eFlatType == wkbCircularString)
{
sEnvelope = EnvelopeType();
return ReadWKBPointSequence<INCLUDE_Z>(data, size, eByteOrder, nDim,
bHasZ, iOffset, sEnvelope);
}
if (eFlatType == wkbPolygon || eFlatType == wkbTriangle)
{
sEnvelope = EnvelopeType();
return ReadWKBRingSequence<INCLUDE_Z>(data, size, eByteOrder, nDim,
bHasZ, iOffset, sEnvelope);
}
if (eFlatType == wkbMultiPoint)
{
sEnvelope = EnvelopeType();
uint32_t nParts = OGRWKBReadUInt32AtOffset(data, eByteOrder, iOffset);
if (nParts >
(size - iOffset) / (WKB_PREFIX_SIZE + nDim * sizeof(double)))
return false;
double dfX = 0;
double dfY = 0;
[[maybe_unused]] double dfZ = 0;
for (uint32_t k = 0; k < nParts; k++)
{
iOffset += WKB_PREFIX_SIZE;
memcpy(&dfX, data + iOffset, sizeof(double));
memcpy(&dfY, data + iOffset + sizeof(double), sizeof(double));
if constexpr (INCLUDE_Z)
{
if (bHasZ)
memcpy(&dfZ, data + iOffset + 2 * sizeof(double),
sizeof(double));
}
iOffset += nDim * sizeof(double);
if (OGR_SWAP(eByteOrder))
{
CPL_SWAP64PTR(&dfX);
CPL_SWAP64PTR(&dfY);
if constexpr (INCLUDE_Z)
{
CPL_SWAP64PTR(&dfZ);
}
}
sEnvelope.MinX = std::min(sEnvelope.MinX, dfX);
sEnvelope.MinY = std::min(sEnvelope.MinY, dfY);
sEnvelope.MaxX = std::max(sEnvelope.MaxX, dfX);
sEnvelope.MaxY = std::max(sEnvelope.MaxY, dfY);
if constexpr (INCLUDE_Z)
{
if (bHasZ)
{
sEnvelope.MinZ = std::min(sEnvelope.MinZ, dfZ);
sEnvelope.MaxZ = std::max(sEnvelope.MaxZ, dfZ);
}
}
}
return true;
}
if (eFlatType == wkbMultiLineString)
{
sEnvelope = EnvelopeType();
const uint32_t nParts =
OGRWKBReadUInt32AtOffset(data, eByteOrder, iOffset);
if (nParts > (size - iOffset) / MIN_WKB_SIZE)
return false;
for (uint32_t k = 0; k < nParts; k++)
{
if (iOffset + MIN_WKB_SIZE > size)
return false;
iOffset += WKB_PREFIX_SIZE;
if (!ReadWKBPointSequence<INCLUDE_Z>(data, size, eByteOrder, nDim,
bHasZ, iOffset, sEnvelope))
return false;
}
return true;
}
if (eFlatType == wkbMultiPolygon)
{
sEnvelope = EnvelopeType();
const uint32_t nParts =
OGRWKBReadUInt32AtOffset(data, eByteOrder, iOffset);
if (nParts > (size - iOffset) / MIN_WKB_SIZE)
return false;
for (uint32_t k = 0; k < nParts; k++)
{
if (iOffset + MIN_WKB_SIZE > size)
return false;
CPLAssert(data[iOffset] == eByteOrder);
iOffset += WKB_PREFIX_SIZE;
if (!ReadWKBRingSequence<INCLUDE_Z>(data, size, eByteOrder, nDim,
bHasZ, iOffset, sEnvelope))
return false;
}
return true;
}
if (eFlatType == wkbGeometryCollection || eFlatType == wkbCompoundCurve ||
eFlatType == wkbCurvePolygon || eFlatType == wkbMultiCurve ||
eFlatType == wkbMultiSurface || eFlatType == wkbPolyhedralSurface ||
eFlatType == wkbTIN)
{
if (nRec == 128)
return false;
sEnvelope = EnvelopeType();
const uint32_t nParts =
OGRWKBReadUInt32AtOffset(data, eByteOrder, iOffset);
if (nParts > (size - iOffset) / MIN_WKB_SIZE)
return false;
EnvelopeType sEnvelopeSubGeom;
for (uint32_t k = 0; k < nParts; k++)
{
if (!OGRWKBGetBoundingBox<INCLUDE_Z>(data, size, iOffset,
sEnvelopeSubGeom, nRec + 1))
return false;
sEnvelope.Merge(sEnvelopeSubGeom);
}
return true;
}
return false;
}
/************************************************************************/
/* OGRWKBGetBoundingBox() */
/************************************************************************/
bool OGRWKBGetBoundingBox(const GByte *pabyWkb, size_t nWKBSize,
OGREnvelope &sEnvelope)
{
size_t iOffset = 0;
return OGRWKBGetBoundingBox<false>(pabyWkb, nWKBSize, iOffset, sEnvelope,
0);
}
/************************************************************************/
/* OGRWKBGetBoundingBox() */
/************************************************************************/
bool OGRWKBGetBoundingBox(const GByte *pabyWkb, size_t nWKBSize,
OGREnvelope3D &sEnvelope)
{
size_t iOffset = 0;
return OGRWKBGetBoundingBox<true>(pabyWkb, nWKBSize, iOffset, sEnvelope, 0);
}
/************************************************************************/
/* OGRWKBIntersectsPointSequencePessimistic() */
/************************************************************************/
static bool OGRWKBIntersectsPointSequencePessimistic(
const uint8_t *data, const size_t size, const OGRwkbByteOrder eByteOrder,
const int nDim, size_t &iOffsetInOut, const OGREnvelope &sEnvelope,
bool &bErrorOut)
{
const uint32_t nPoints =
OGRWKBReadUInt32AtOffset(data, eByteOrder, iOffsetInOut);
if (nPoints > (size - iOffsetInOut) / (nDim * sizeof(double)))
{
bErrorOut = true;
return false;
}
double dfX = 0;
double dfY = 0;
for (uint32_t j = 0; j < nPoints; j++)
{
memcpy(&dfX, data + iOffsetInOut, sizeof(double));
memcpy(&dfY, data + iOffsetInOut + sizeof(double), sizeof(double));
iOffsetInOut += nDim * sizeof(double);
if (OGR_SWAP(eByteOrder))
{
CPL_SWAP64PTR(&dfX);
CPL_SWAP64PTR(&dfY);
}
if (dfX >= sEnvelope.MinX && dfY >= sEnvelope.MinY &&
dfX <= sEnvelope.MaxX && dfY <= sEnvelope.MaxY)
{
return true;
}
}
return false;
}
/************************************************************************/
/* OGRWKBIntersectsRingSequencePessimistic() */
/************************************************************************/
static bool OGRWKBIntersectsRingSequencePessimistic(
const uint8_t *data, const size_t size, const OGRwkbByteOrder eByteOrder,
const int nDim, size_t &iOffsetInOut, const OGREnvelope &sEnvelope,
bool &bErrorOut)
{
const uint32_t nRings =
OGRWKBReadUInt32AtOffset(data, eByteOrder, iOffsetInOut);
if (nRings > (size - iOffsetInOut) / sizeof(uint32_t))
{
bErrorOut = true;
return false;
}
if (nRings == 0)
return false;
if (iOffsetInOut + sizeof(uint32_t) > size)
{
bErrorOut = true;
return false;
}
if (OGRWKBIntersectsPointSequencePessimistic(
data, size, eByteOrder, nDim, iOffsetInOut, sEnvelope, bErrorOut))
{
return true;
}
if (bErrorOut)
return false;
// skip inner rings
for (uint32_t i = 1; i < nRings; ++i)
{
if (iOffsetInOut + sizeof(uint32_t) > size)
{
bErrorOut = true;
return false;
}
const uint32_t nPoints =
OGRWKBReadUInt32AtOffset(data, eByteOrder, iOffsetInOut);
if (nPoints > (size - iOffsetInOut) / (nDim * sizeof(double)))
{
bErrorOut = true;
return false;
}
iOffsetInOut += sizeof(double) * nPoints * nDim;
}
return false;
}
/************************************************************************/
/* OGRWKBIntersectsPessimistic() */
/************************************************************************/
static bool OGRWKBIntersectsPessimistic(const GByte *data, const size_t size,
size_t &iOffsetInOut,
const OGREnvelope &sEnvelope,
const int nRec, bool &bErrorOut)
{
if (size - iOffsetInOut < MIN_WKB_SIZE)
{
bErrorOut = true;
return false;
}
const int nByteOrder = DB2_V72_FIX_BYTE_ORDER(data[iOffsetInOut]);
if (!(nByteOrder == wkbXDR || nByteOrder == wkbNDR))
{
bErrorOut = true;
return false;
}
const OGRwkbByteOrder eByteOrder = static_cast<OGRwkbByteOrder>(nByteOrder);
OGRwkbGeometryType eGeometryType = wkbUnknown;
OGRReadWKBGeometryType(data + iOffsetInOut, wkbVariantIso, &eGeometryType);
iOffsetInOut += 5;
const auto eFlatType = wkbFlatten(eGeometryType);
const int nDim = 2 + (OGR_GT_HasZ(eGeometryType) ? 1 : 0) +
(OGR_GT_HasM(eGeometryType) ? 1 : 0);
if (eFlatType == wkbPoint)
{
if (size - iOffsetInOut < nDim * sizeof(double))
return false;
double dfX = 0;
double dfY = 0;
memcpy(&dfX, data + iOffsetInOut, sizeof(double));
memcpy(&dfY, data + iOffsetInOut + sizeof(double), sizeof(double));
iOffsetInOut += nDim * sizeof(double);
if (OGR_SWAP(eByteOrder))
{
CPL_SWAP64PTR(&dfX);
CPL_SWAP64PTR(&dfY);
}
if (std::isnan(dfX))
{
return false;
}
else
{
return dfX >= sEnvelope.MinX && dfX <= sEnvelope.MaxX &&
dfY >= sEnvelope.MinY && dfY <= sEnvelope.MaxY;
}
}
if (eFlatType == wkbLineString || eFlatType == wkbCircularString)
{
return OGRWKBIntersectsPointSequencePessimistic(
data, size, eByteOrder, nDim, iOffsetInOut, sEnvelope, bErrorOut);
}
if (eFlatType == wkbPolygon || eFlatType == wkbTriangle)
{
return OGRWKBIntersectsRingSequencePessimistic(
data, size, eByteOrder, nDim, iOffsetInOut, sEnvelope, bErrorOut);
}
if (eFlatType == wkbMultiPoint || eFlatType == wkbMultiLineString ||
eFlatType == wkbMultiPolygon || eFlatType == wkbGeometryCollection ||
eFlatType == wkbCompoundCurve || eFlatType == wkbCurvePolygon ||
eFlatType == wkbMultiCurve || eFlatType == wkbMultiSurface ||
eFlatType == wkbPolyhedralSurface || eFlatType == wkbTIN)
{
if (nRec == 128)
{
bErrorOut = true;
return false;
}
const uint32_t nParts =
OGRWKBReadUInt32AtOffset(data, eByteOrder, iOffsetInOut);
if (nParts > (size - iOffsetInOut) / MIN_WKB_SIZE)
{
bErrorOut = true;
return false;
}
for (uint32_t k = 0; k < nParts; k++)
{
if (OGRWKBIntersectsPessimistic(data, size, iOffsetInOut, sEnvelope,
nRec + 1, bErrorOut))
{
return true;
}
else if (bErrorOut)
{
return false;
}
}
return false;
}
bErrorOut = true;
return false;
}
/************************************************************************/
/* OGRWKBIntersectsPessimistic() */
/************************************************************************/
/* Returns whether the geometry (pabyWkb, nWKBSize) intersects, for sure,
* the passed envelope.
* When it returns true, the geometry intersects the envelope.
* When it returns false, the geometry may or may not intersect the envelope.
*/
bool OGRWKBIntersectsPessimistic(const GByte *pabyWkb, size_t nWKBSize,
const OGREnvelope &sEnvelope)
{
size_t iOffsetInOut = 0;
bool bErrorOut = false;
bool bRet = OGRWKBIntersectsPessimistic(pabyWkb, nWKBSize, iOffsetInOut,
sEnvelope, 0, bErrorOut);
if (!bRet && !bErrorOut)
{
// The following assert only holds if there is no trailing data
// after the WKB
// CPLAssert(iOffsetInOut == nWKBSize);
}
return bRet;
}
/************************************************************************/
/* epsilonEqual() */
/************************************************************************/
constexpr double EPSILON = 1.0E-5;
static inline bool epsilonEqual(double a, double b, double eps)
{
return ::fabs(a - b) < eps;
}
/************************************************************************/
/* OGRWKBIsClockwiseRing() */
/************************************************************************/
static inline double GetX(const GByte *data, uint32_t i, int nDim,
bool bNeedSwap)
{
double dfX;
memcpy(&dfX, data + static_cast<size_t>(i) * nDim * sizeof(double),
sizeof(double));
if (bNeedSwap)
CPL_SWAP64PTR(&dfX);
return dfX;
}
static inline double GetY(const GByte *data, uint32_t i, int nDim,
bool bNeedSwap)
{
double dfY;
memcpy(&dfY, data + (static_cast<size_t>(i) * nDim + 1) * sizeof(double),
sizeof(double));
if (bNeedSwap)
CPL_SWAP64PTR(&dfY);
return dfY;
}
static bool OGRWKBIsClockwiseRing(const GByte *data, const uint32_t nPoints,
const int nDim, const bool bNeedSwap)
{
// WARNING: keep in sync OGRLineString::isClockwise(),
// OGRCurve::isClockwise() and OGRWKBIsClockwiseRing()
bool bUseFallback = false;
// Find the lowest rightmost vertex.
uint32_t v = 0; // Used after for.
double vX = GetX(data, v, nDim, bNeedSwap);
double vY = GetY(data, v, nDim, bNeedSwap);
for (uint32_t i = 1; i < nPoints - 1; i++)
{
// => v < end.
const double y = GetY(data, i, nDim, bNeedSwap);
if (y < vY)
{
v = i;
vX = GetX(data, i, nDim, bNeedSwap);
vY = y;
bUseFallback = false;
}
else if (y == vY)
{
const double x = GetX(data, i, nDim, bNeedSwap);
if (x > vX)
{
v = i;
vX = x;
vY = y;
bUseFallback = false;
}
else if (x == vX)
{
// Two vertex with same coordinates are the lowest rightmost
// vertex. Cannot use that point as the pivot (#5342).
bUseFallback = true;
}
}
}
// Previous.
uint32_t next = (v == 0) ? nPoints - 2 : v - 1;
if (epsilonEqual(GetX(data, next, nDim, bNeedSwap), vX, EPSILON) &&
epsilonEqual(GetY(data, next, nDim, bNeedSwap), vY, EPSILON))
{
// Don't try to be too clever by retrying with a next point.
// This can lead to false results as in the case of #3356.
bUseFallback = true;
}
const double dx0 = GetX(data, next, nDim, bNeedSwap) - vX;
const double dy0 = GetY(data, next, nDim, bNeedSwap) - vY;
// Following.
next = v + 1;
if (next >= nPoints - 1)
{
next = 0;
}
if (epsilonEqual(GetX(data, next, nDim, bNeedSwap), vX, EPSILON) &&
epsilonEqual(GetY(data, next, nDim, bNeedSwap), vY, EPSILON))
{
// Don't try to be too clever by retrying with a next point.
// This can lead to false results as in the case of #3356.
bUseFallback = true;
}
const double dx1 = GetX(data, next, nDim, bNeedSwap) - vX;
const double dy1 = GetY(data, next, nDim, bNeedSwap) - vY;
const double crossproduct = dx1 * dy0 - dx0 * dy1;
if (!bUseFallback)
{
if (crossproduct > 0) // CCW
return false;
else if (crossproduct < 0) // CW
return true;
}
// This is a degenerate case: the extent of the polygon is less than EPSILON
// or 2 nearly identical points were found.
// Try with Green Formula as a fallback, but this is not a guarantee
// as we'll probably be affected by numerical instabilities.
double dfSum = GetX(data, 0, nDim, bNeedSwap) *
(GetY(data, 1, nDim, bNeedSwap) -
GetY(data, nPoints - 1, nDim, bNeedSwap));
for (uint32_t i = 1; i < nPoints - 1; i++)
{
dfSum += GetX(data, i, nDim, bNeedSwap) *
(GetY(data, i + 1, nDim, bNeedSwap) -
GetY(data, i - 1, nDim, bNeedSwap));
}
dfSum += GetX(data, nPoints - 1, nDim, bNeedSwap) *
(GetY(data, 0, nDim, bNeedSwap) -
GetX(data, nPoints - 2, nDim, bNeedSwap));
return dfSum < 0;
}
/************************************************************************/
/* OGRWKBFixupCounterClockWiseExternalRing() */
/************************************************************************/
static bool OGRWKBFixupCounterClockWiseExternalRingInternal(
GByte *data, size_t size, size_t &iOffsetInOut, const int nRec)
{
if (size - iOffsetInOut < MIN_WKB_SIZE)
{
return false;
}
const int nByteOrder = DB2_V72_FIX_BYTE_ORDER(data[iOffsetInOut]);
if (!(nByteOrder == wkbXDR || nByteOrder == wkbNDR))
{
return false;
}
const OGRwkbByteOrder eByteOrder = static_cast<OGRwkbByteOrder>(nByteOrder);
OGRwkbGeometryType eGeometryType = wkbUnknown;
OGRReadWKBGeometryType(data + iOffsetInOut, wkbVariantIso, &eGeometryType);
iOffsetInOut += 5;
const auto eFlatType = wkbFlatten(eGeometryType);
const int nDim = 2 + (OGR_GT_HasZ(eGeometryType) ? 1 : 0) +
(OGR_GT_HasM(eGeometryType) ? 1 : 0);
if (eFlatType == wkbPolygon)
{
const uint32_t nRings =
OGRWKBReadUInt32AtOffset(data, eByteOrder, iOffsetInOut);
if (nRings > (size - iOffsetInOut) / sizeof(uint32_t))
{