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shptree.c
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/******************************************************************************
*
* Project: Shapelib
* Purpose: Implementation of quadtree building and searching functions.
* Author: Frank Warmerdam, [email protected]
*
******************************************************************************
* Copyright (c) 1999, Frank Warmerdam
* Copyright (c) 2012-2024, Even Rouault <even dot rouault at spatialys.com>
*
* SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
******************************************************************************
*
*/
#include "shapefil_private.h"
#include <math.h>
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#ifdef USE_CPL
#include "cpl_error.h"
#endif
#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif
/* -------------------------------------------------------------------- */
/* If the following is 0.5, nodes will be split in half. If it */
/* is 0.6 then each subnode will contain 60% of the parent */
/* node, with 20% representing overlap. This can be help to */
/* prevent small objects on a boundary from shifting too high */
/* up the tree. */
/* -------------------------------------------------------------------- */
#define SHP_SPLIT_RATIO 0.55
/************************************************************************/
/* SHPTreeNodeInit() */
/* */
/* Initialize a tree node. */
/************************************************************************/
static SHPTreeNode *SHPTreeNodeCreate(const double *padfBoundsMin,
const double *padfBoundsMax)
{
SHPTreeNode *psTreeNode;
psTreeNode = STATIC_CAST(SHPTreeNode *, malloc(sizeof(SHPTreeNode)));
if (SHPLIB_NULLPTR == psTreeNode)
return SHPLIB_NULLPTR;
psTreeNode->nShapeCount = 0;
psTreeNode->panShapeIds = SHPLIB_NULLPTR;
psTreeNode->papsShapeObj = SHPLIB_NULLPTR;
psTreeNode->nSubNodes = 0;
if (padfBoundsMin != SHPLIB_NULLPTR)
memcpy(psTreeNode->adfBoundsMin, padfBoundsMin, sizeof(double) * 4);
if (padfBoundsMax != SHPLIB_NULLPTR)
memcpy(psTreeNode->adfBoundsMax, padfBoundsMax, sizeof(double) * 4);
return psTreeNode;
}
/************************************************************************/
/* SHPCreateTree() */
/************************************************************************/
SHPTree SHPAPI_CALL1(*)
SHPCreateTree(SHPHandle hSHP, int nDimension, int nMaxDepth,
const double *padfBoundsMin, const double *padfBoundsMax)
{
SHPTree *psTree;
if (padfBoundsMin == SHPLIB_NULLPTR && hSHP == SHPLIB_NULLPTR)
return SHPLIB_NULLPTR;
/* -------------------------------------------------------------------- */
/* Allocate the tree object */
/* -------------------------------------------------------------------- */
psTree = STATIC_CAST(SHPTree *, malloc(sizeof(SHPTree)));
if (SHPLIB_NULLPTR == psTree)
{
return SHPLIB_NULLPTR;
}
psTree->hSHP = hSHP;
psTree->nMaxDepth = nMaxDepth;
psTree->nDimension = nDimension;
psTree->nTotalCount = 0;
/* -------------------------------------------------------------------- */
/* If no max depth was defined, try to select a reasonable one */
/* that implies approximately 8 shapes per node. */
/* -------------------------------------------------------------------- */
if (psTree->nMaxDepth == 0 && hSHP != SHPLIB_NULLPTR)
{
int nMaxNodeCount = 1;
int nShapeCount;
SHPGetInfo(hSHP, &nShapeCount, SHPLIB_NULLPTR, SHPLIB_NULLPTR,
SHPLIB_NULLPTR);
while (nMaxNodeCount * 4 < nShapeCount)
{
psTree->nMaxDepth += 1;
nMaxNodeCount = nMaxNodeCount * 2;
}
#ifdef USE_CPL
CPLDebug("Shape", "Estimated spatial index tree depth: %d",
psTree->nMaxDepth);
#endif
/* NOTE: Due to problems with memory allocation for deep trees,
* automatically estimated depth is limited up to 12 levels.
* See Ticket #1594 for detailed discussion.
*/
if (psTree->nMaxDepth > MAX_DEFAULT_TREE_DEPTH)
{
psTree->nMaxDepth = MAX_DEFAULT_TREE_DEPTH;
#ifdef USE_CPL
CPLDebug(
"Shape",
"Falling back to max number of allowed index tree levels (%d).",
MAX_DEFAULT_TREE_DEPTH);
#endif
}
}
/* -------------------------------------------------------------------- */
/* Allocate the root node. */
/* -------------------------------------------------------------------- */
psTree->psRoot = SHPTreeNodeCreate(padfBoundsMin, padfBoundsMax);
if (SHPLIB_NULLPTR == psTree->psRoot)
{
free(psTree);
return SHPLIB_NULLPTR;
}
/* -------------------------------------------------------------------- */
/* Assign the bounds to the root node. If none are passed in, */
/* use the bounds of the provided file otherwise the create */
/* function will have already set the bounds. */
/* -------------------------------------------------------------------- */
if (padfBoundsMin == SHPLIB_NULLPTR)
{
SHPGetInfo(hSHP, SHPLIB_NULLPTR, SHPLIB_NULLPTR,
psTree->psRoot->adfBoundsMin, psTree->psRoot->adfBoundsMax);
}
/* -------------------------------------------------------------------- */
/* If we have a file, insert all its shapes into the tree. */
/* -------------------------------------------------------------------- */
if (hSHP != SHPLIB_NULLPTR)
{
int iShape, nShapeCount;
SHPGetInfo(hSHP, &nShapeCount, SHPLIB_NULLPTR, SHPLIB_NULLPTR,
SHPLIB_NULLPTR);
for (iShape = 0; iShape < nShapeCount; iShape++)
{
SHPObject *psShape;
psShape = SHPReadObject(hSHP, iShape);
if (psShape != SHPLIB_NULLPTR)
{
SHPTreeAddShapeId(psTree, psShape);
SHPDestroyObject(psShape);
}
}
}
return psTree;
}
/************************************************************************/
/* SHPDestroyTreeNode() */
/************************************************************************/
static void SHPDestroyTreeNode(SHPTreeNode *psTreeNode)
{
int i;
assert(SHPLIB_NULLPTR != psTreeNode);
for (i = 0; i < psTreeNode->nSubNodes; i++)
{
if (psTreeNode->apsSubNode[i] != SHPLIB_NULLPTR)
SHPDestroyTreeNode(psTreeNode->apsSubNode[i]);
}
if (psTreeNode->panShapeIds != SHPLIB_NULLPTR)
free(psTreeNode->panShapeIds);
if (psTreeNode->papsShapeObj != SHPLIB_NULLPTR)
{
for (i = 0; i < psTreeNode->nShapeCount; i++)
{
if (psTreeNode->papsShapeObj[i] != SHPLIB_NULLPTR)
SHPDestroyObject(psTreeNode->papsShapeObj[i]);
}
free(psTreeNode->papsShapeObj);
}
free(psTreeNode);
}
/************************************************************************/
/* SHPDestroyTree() */
/************************************************************************/
void SHPAPI_CALL SHPDestroyTree(SHPTree *psTree)
{
SHPDestroyTreeNode(psTree->psRoot);
free(psTree);
}
/************************************************************************/
/* SHPCheckBoundsOverlap() */
/* */
/* Do the given boxes overlap at all? */
/************************************************************************/
int SHPAPI_CALL SHPCheckBoundsOverlap(const double *padfBox1Min,
const double *padfBox1Max,
const double *padfBox2Min,
const double *padfBox2Max, int nDimension)
{
for (int iDim = 0; iDim < nDimension; iDim++)
{
if (padfBox2Max[iDim] < padfBox1Min[iDim])
return FALSE;
if (padfBox1Max[iDim] < padfBox2Min[iDim])
return FALSE;
}
return TRUE;
}
/************************************************************************/
/* SHPCheckObjectContained() */
/* */
/* Does the given shape fit within the indicated extents? */
/************************************************************************/
static bool SHPCheckObjectContained(const SHPObject *psObject, int nDimension,
const double *padfBoundsMin,
const double *padfBoundsMax)
{
if (psObject->dfXMin < padfBoundsMin[0] ||
psObject->dfXMax > padfBoundsMax[0])
return false;
if (psObject->dfYMin < padfBoundsMin[1] ||
psObject->dfYMax > padfBoundsMax[1])
return false;
if (nDimension == 2)
return true;
if (psObject->dfZMin < padfBoundsMin[2] ||
psObject->dfZMax > padfBoundsMax[2])
return false;
if (nDimension == 3)
return true;
if (psObject->dfMMin < padfBoundsMin[3] ||
psObject->dfMMax > padfBoundsMax[3])
return false;
return true;
}
/************************************************************************/
/* SHPTreeSplitBounds() */
/* */
/* Split a region into two subregion evenly, cutting along the */
/* longest dimension. */
/************************************************************************/
static void SHPTreeSplitBounds(const double *padfBoundsMinIn,
const double *padfBoundsMaxIn,
double *padfBoundsMin1, double *padfBoundsMax1,
double *padfBoundsMin2, double *padfBoundsMax2)
{
/* -------------------------------------------------------------------- */
/* The output bounds will be very similar to the input bounds, */
/* so just copy over to start. */
/* -------------------------------------------------------------------- */
memcpy(padfBoundsMin1, padfBoundsMinIn, sizeof(double) * 4);
memcpy(padfBoundsMax1, padfBoundsMaxIn, sizeof(double) * 4);
memcpy(padfBoundsMin2, padfBoundsMinIn, sizeof(double) * 4);
memcpy(padfBoundsMax2, padfBoundsMaxIn, sizeof(double) * 4);
/* -------------------------------------------------------------------- */
/* Split in X direction. */
/* -------------------------------------------------------------------- */
if ((padfBoundsMaxIn[0] - padfBoundsMinIn[0]) >
(padfBoundsMaxIn[1] - padfBoundsMinIn[1]))
{
double dfRange = padfBoundsMaxIn[0] - padfBoundsMinIn[0];
padfBoundsMax1[0] = padfBoundsMinIn[0] + dfRange * SHP_SPLIT_RATIO;
padfBoundsMin2[0] = padfBoundsMaxIn[0] - dfRange * SHP_SPLIT_RATIO;
}
/* -------------------------------------------------------------------- */
/* Otherwise split in Y direction. */
/* -------------------------------------------------------------------- */
else
{
double dfRange = padfBoundsMaxIn[1] - padfBoundsMinIn[1];
padfBoundsMax1[1] = padfBoundsMinIn[1] + dfRange * SHP_SPLIT_RATIO;
padfBoundsMin2[1] = padfBoundsMaxIn[1] - dfRange * SHP_SPLIT_RATIO;
}
}
/************************************************************************/
/* SHPTreeNodeAddShapeId() */
/************************************************************************/
static bool SHPTreeNodeAddShapeId(SHPTreeNode *psTreeNode, SHPObject *psObject,
int nMaxDepth, int nDimension)
{
int i;
/* -------------------------------------------------------------------- */
/* If there are subnodes, then consider whether this object */
/* will fit in them. */
/* -------------------------------------------------------------------- */
if (nMaxDepth > 1 && psTreeNode->nSubNodes > 0)
{
for (i = 0; i < psTreeNode->nSubNodes; i++)
{
if (SHPCheckObjectContained(
psObject, nDimension,
psTreeNode->apsSubNode[i]->adfBoundsMin,
psTreeNode->apsSubNode[i]->adfBoundsMax))
{
return SHPTreeNodeAddShapeId(psTreeNode->apsSubNode[i],
psObject, nMaxDepth - 1,
nDimension);
}
}
}
/* -------------------------------------------------------------------- */
/* Otherwise, consider creating four subnodes if could fit into */
/* them, and adding to the appropriate subnode. */
/* -------------------------------------------------------------------- */
#if MAX_SUBNODE == 4
else if (nMaxDepth > 1 && psTreeNode->nSubNodes == 0)
{
double adfBoundsMinH1[4], adfBoundsMaxH1[4];
double adfBoundsMinH2[4], adfBoundsMaxH2[4];
double adfBoundsMin1[4], adfBoundsMax1[4];
double adfBoundsMin2[4], adfBoundsMax2[4];
double adfBoundsMin3[4], adfBoundsMax3[4];
double adfBoundsMin4[4], adfBoundsMax4[4];
SHPTreeSplitBounds(psTreeNode->adfBoundsMin, psTreeNode->adfBoundsMax,
adfBoundsMinH1, adfBoundsMaxH1, adfBoundsMinH2,
adfBoundsMaxH2);
SHPTreeSplitBounds(adfBoundsMinH1, adfBoundsMaxH1, adfBoundsMin1,
adfBoundsMax1, adfBoundsMin2, adfBoundsMax2);
SHPTreeSplitBounds(adfBoundsMinH2, adfBoundsMaxH2, adfBoundsMin3,
adfBoundsMax3, adfBoundsMin4, adfBoundsMax4);
if (SHPCheckObjectContained(psObject, nDimension, adfBoundsMin1,
adfBoundsMax1) ||
SHPCheckObjectContained(psObject, nDimension, adfBoundsMin2,
adfBoundsMax2) ||
SHPCheckObjectContained(psObject, nDimension, adfBoundsMin3,
adfBoundsMax3) ||
SHPCheckObjectContained(psObject, nDimension, adfBoundsMin4,
adfBoundsMax4))
{
psTreeNode->nSubNodes = 4;
psTreeNode->apsSubNode[0] =
SHPTreeNodeCreate(adfBoundsMin1, adfBoundsMax1);
psTreeNode->apsSubNode[1] =
SHPTreeNodeCreate(adfBoundsMin2, adfBoundsMax2);
psTreeNode->apsSubNode[2] =
SHPTreeNodeCreate(adfBoundsMin3, adfBoundsMax3);
psTreeNode->apsSubNode[3] =
SHPTreeNodeCreate(adfBoundsMin4, adfBoundsMax4);
/* recurse back on this node now that it has subnodes */
return (SHPTreeNodeAddShapeId(psTreeNode, psObject, nMaxDepth,
nDimension));
}
}
#endif /* MAX_SUBNODE == 4 */
/* -------------------------------------------------------------------- */
/* Otherwise, consider creating two subnodes if could fit into */
/* them, and adding to the appropriate subnode. */
/* -------------------------------------------------------------------- */
#if MAX_SUBNODE == 2
else if (nMaxDepth > 1 && psTreeNode->nSubNodes == 0)
{
double adfBoundsMin1[4], adfBoundsMax1[4];
double adfBoundsMin2[4], adfBoundsMax2[4];
SHPTreeSplitBounds(psTreeNode->adfBoundsMin, psTreeNode->adfBoundsMax,
adfBoundsMin1, adfBoundsMax1, adfBoundsMin2,
adfBoundsMax2);
if (SHPCheckObjectContained(psObject, nDimension, adfBoundsMin1,
adfBoundsMax1))
{
psTreeNode->nSubNodes = 2;
psTreeNode->apsSubNode[0] =
SHPTreeNodeCreate(adfBoundsMin1, adfBoundsMax1);
psTreeNode->apsSubNode[1] =
SHPTreeNodeCreate(adfBoundsMin2, adfBoundsMax2);
return (SHPTreeNodeAddShapeId(psTreeNode->apsSubNode[0], psObject,
nMaxDepth - 1, nDimension));
}
else if (SHPCheckObjectContained(psObject, nDimension, adfBoundsMin2,
adfBoundsMax2))
{
psTreeNode->nSubNodes = 2;
psTreeNode->apsSubNode[0] =
SHPTreeNodeCreate(adfBoundsMin1, adfBoundsMax1);
psTreeNode->apsSubNode[1] =
SHPTreeNodeCreate(adfBoundsMin2, adfBoundsMax2);
return (SHPTreeNodeAddShapeId(psTreeNode->apsSubNode[1], psObject,
nMaxDepth - 1, nDimension));
}
}
#endif /* MAX_SUBNODE == 2 */
/* -------------------------------------------------------------------- */
/* If none of that worked, just add it to this nodes list. */
/* -------------------------------------------------------------------- */
psTreeNode->nShapeCount++;
psTreeNode->panShapeIds =
STATIC_CAST(int *, realloc(psTreeNode->panShapeIds,
sizeof(int) * psTreeNode->nShapeCount));
psTreeNode->panShapeIds[psTreeNode->nShapeCount - 1] = psObject->nShapeId;
if (psTreeNode->papsShapeObj != SHPLIB_NULLPTR)
{
psTreeNode->papsShapeObj = STATIC_CAST(
SHPObject **, realloc(psTreeNode->papsShapeObj,
sizeof(void *) * psTreeNode->nShapeCount));
psTreeNode->papsShapeObj[psTreeNode->nShapeCount - 1] = SHPLIB_NULLPTR;
}
return true;
}
/************************************************************************/
/* SHPTreeAddShapeId() */
/* */
/* Add a shape to the tree, but don't keep a pointer to the */
/* object data, just keep the shapeid. */
/************************************************************************/
int SHPAPI_CALL SHPTreeAddShapeId(SHPTree *psTree, SHPObject *psObject)
{
psTree->nTotalCount++;
return (SHPTreeNodeAddShapeId(psTree->psRoot, psObject, psTree->nMaxDepth,
psTree->nDimension));
}
/************************************************************************/
/* SHPTreeCollectShapesIds() */
/* */
/* Work function implementing SHPTreeFindLikelyShapes() on a */
/* tree node by tree node basis. */
/************************************************************************/
static void SHPTreeCollectShapeIds(const SHPTree *hTree,
const SHPTreeNode *psTreeNode,
double *padfBoundsMin, double *padfBoundsMax,
int *pnShapeCount, int *pnMaxShapes,
int **ppanShapeList)
{
int i;
/* -------------------------------------------------------------------- */
/* Does this node overlap the area of interest at all? If not, */
/* return without adding to the list at all. */
/* -------------------------------------------------------------------- */
if (!SHPCheckBoundsOverlap(psTreeNode->adfBoundsMin,
psTreeNode->adfBoundsMax, padfBoundsMin,
padfBoundsMax, hTree->nDimension))
return;
/* -------------------------------------------------------------------- */
/* Grow the list to hold the shapes on this node. */
/* -------------------------------------------------------------------- */
if (*pnShapeCount + psTreeNode->nShapeCount > *pnMaxShapes)
{
*pnMaxShapes = (*pnShapeCount + psTreeNode->nShapeCount) * 2 + 20;
*ppanShapeList = STATIC_CAST(
int *, realloc(*ppanShapeList, sizeof(int) * *pnMaxShapes));
}
/* -------------------------------------------------------------------- */
/* Add the local nodes shapeids to the list. */
/* -------------------------------------------------------------------- */
for (i = 0; i < psTreeNode->nShapeCount; i++)
{
(*ppanShapeList)[(*pnShapeCount)++] = psTreeNode->panShapeIds[i];
}
/* -------------------------------------------------------------------- */
/* Recurse to subnodes if they exist. */
/* -------------------------------------------------------------------- */
for (i = 0; i < psTreeNode->nSubNodes; i++)
{
if (psTreeNode->apsSubNode[i] != SHPLIB_NULLPTR)
SHPTreeCollectShapeIds(hTree, psTreeNode->apsSubNode[i],
padfBoundsMin, padfBoundsMax, pnShapeCount,
pnMaxShapes, ppanShapeList);
}
}
/************************************************************************/
/* SHPTreeFindLikelyShapes() */
/* */
/* Find all shapes within tree nodes for which the tree node */
/* bounding box overlaps the search box. The return value is */
/* an array of shapeids terminated by a -1. The shapeids will */
/* be in order, as hopefully this will result in faster (more */
/* sequential) reading from the file. */
/************************************************************************/
/* helper for qsort */
static int SHPTreeCompareInts(const void *a, const void *b)
{
return *REINTERPRET_CAST(const int *, a) -
*REINTERPRET_CAST(const int *, b);
}
int SHPAPI_CALL1(*)
SHPTreeFindLikelyShapes(const SHPTree *hTree, double *padfBoundsMin,
double *padfBoundsMax, int *pnShapeCount)
{
int *panShapeList = SHPLIB_NULLPTR, nMaxShapes = 0;
/* -------------------------------------------------------------------- */
/* Perform the search by recursive descent. */
/* -------------------------------------------------------------------- */
*pnShapeCount = 0;
SHPTreeCollectShapeIds(hTree, hTree->psRoot, padfBoundsMin, padfBoundsMax,
pnShapeCount, &nMaxShapes, &panShapeList);
/* -------------------------------------------------------------------- */
/* Sort the id array */
/* -------------------------------------------------------------------- */
if (panShapeList != SHPLIB_NULLPTR)
qsort(panShapeList, *pnShapeCount, sizeof(int), SHPTreeCompareInts);
return panShapeList;
}
/************************************************************************/
/* SHPTreeNodeTrim() */
/* */
/* This is the recursive version of SHPTreeTrimExtraNodes() that */
/* walks the tree cleaning it up. */
/************************************************************************/
static int SHPTreeNodeTrim(SHPTreeNode *psTreeNode)
{
int i;
/* -------------------------------------------------------------------- */
/* Trim subtrees, and free subnodes that come back empty. */
/* -------------------------------------------------------------------- */
for (i = 0; i < psTreeNode->nSubNodes; i++)
{
if (SHPTreeNodeTrim(psTreeNode->apsSubNode[i]))
{
SHPDestroyTreeNode(psTreeNode->apsSubNode[i]);
psTreeNode->apsSubNode[i] =
psTreeNode->apsSubNode[psTreeNode->nSubNodes - 1];
psTreeNode->nSubNodes--;
i--; /* process the new occupant of this subnode entry */
}
}
/* -------------------------------------------------------------------- */
/* If the current node has 1 subnode and no shapes, promote that */
/* subnode to the current node position. */
/* -------------------------------------------------------------------- */
if (psTreeNode->nSubNodes == 1 && psTreeNode->nShapeCount == 0)
{
SHPTreeNode *psSubNode = psTreeNode->apsSubNode[0];
memcpy(psTreeNode->adfBoundsMin, psSubNode->adfBoundsMin,
sizeof(psSubNode->adfBoundsMin));
memcpy(psTreeNode->adfBoundsMax, psSubNode->adfBoundsMax,
sizeof(psSubNode->adfBoundsMax));
psTreeNode->nShapeCount = psSubNode->nShapeCount;
assert(psTreeNode->panShapeIds == SHPLIB_NULLPTR);
psTreeNode->panShapeIds = psSubNode->panShapeIds;
assert(psTreeNode->papsShapeObj == SHPLIB_NULLPTR);
psTreeNode->papsShapeObj = psSubNode->papsShapeObj;
psTreeNode->nSubNodes = psSubNode->nSubNodes;
for (i = 0; i < psSubNode->nSubNodes; i++)
psTreeNode->apsSubNode[i] = psSubNode->apsSubNode[i];
free(psSubNode);
}
/* -------------------------------------------------------------------- */
/* We should be trimmed if we have no subnodes, and no shapes. */
/* -------------------------------------------------------------------- */
return (psTreeNode->nSubNodes == 0 && psTreeNode->nShapeCount == 0);
}
/************************************************************************/
/* SHPTreeTrimExtraNodes() */
/* */
/* Trim empty nodes from the tree. Note that we never trim an */
/* empty root node. */
/************************************************************************/
void SHPAPI_CALL SHPTreeTrimExtraNodes(SHPTree *hTree)
{
SHPTreeNodeTrim(hTree->psRoot);
}
struct SHPDiskTreeInfo
{
SAHooks sHooks;
SAFile fpQIX;
};
/************************************************************************/
/* SHPOpenDiskTree() */
/************************************************************************/
SHPTreeDiskHandle SHPOpenDiskTree(const char *pszQIXFilename,
const SAHooks *psHooks)
{
SHPTreeDiskHandle hDiskTree;
hDiskTree = STATIC_CAST(SHPTreeDiskHandle,
calloc(1, sizeof(struct SHPDiskTreeInfo)));
if (!hDiskTree)
return SHPLIB_NULLPTR;
if (psHooks == SHPLIB_NULLPTR)
SASetupDefaultHooks(&(hDiskTree->sHooks));
else
memcpy(&(hDiskTree->sHooks), psHooks, sizeof(SAHooks));
hDiskTree->fpQIX = hDiskTree->sHooks.FOpen(pszQIXFilename, "rb",
hDiskTree->sHooks.pvUserData);
if (hDiskTree->fpQIX == SHPLIB_NULLPTR)
{
free(hDiskTree);
return SHPLIB_NULLPTR;
}
return hDiskTree;
}
/***********************************************************************/
/* SHPCloseDiskTree() */
/************************************************************************/
void SHPCloseDiskTree(SHPTreeDiskHandle hDiskTree)
{
if (hDiskTree == SHPLIB_NULLPTR)
return;
hDiskTree->sHooks.FClose(hDiskTree->fpQIX);
free(hDiskTree);
}
/************************************************************************/
/* SHPSearchDiskTreeNode() */
/************************************************************************/
static bool SHPSearchDiskTreeNode(const SHPTreeDiskHandle hDiskTree,
double *padfBoundsMin, double *padfBoundsMax,
int **ppanResultBuffer, int *pnBufferMax,
int *pnResultCount, int bNeedSwap,
int nRecLevel)
{
unsigned int i;
unsigned int offset;
unsigned int numshapes, numsubnodes;
double adfNodeBoundsMin[2], adfNodeBoundsMax[2];
int nFReadAcc;
/* -------------------------------------------------------------------- */
/* Read and unswap first part of node info. */
/* -------------------------------------------------------------------- */
nFReadAcc = STATIC_CAST(
int, hDiskTree->sHooks.FRead(&offset, 4, 1, hDiskTree->fpQIX));
if (bNeedSwap)
SHP_SWAP32(&offset);
nFReadAcc += STATIC_CAST(int, hDiskTree->sHooks.FRead(adfNodeBoundsMin,
sizeof(double), 2,
hDiskTree->fpQIX));
nFReadAcc += STATIC_CAST(int, hDiskTree->sHooks.FRead(adfNodeBoundsMax,
sizeof(double), 2,
hDiskTree->fpQIX));
if (bNeedSwap)
{
SHP_SWAPDOUBLE(adfNodeBoundsMin + 0);
SHP_SWAPDOUBLE(adfNodeBoundsMin + 1);
SHP_SWAPDOUBLE(adfNodeBoundsMax + 0);
SHP_SWAPDOUBLE(adfNodeBoundsMax + 1);
}
nFReadAcc += STATIC_CAST(
int, hDiskTree->sHooks.FRead(&numshapes, 4, 1, hDiskTree->fpQIX));
if (bNeedSwap)
SHP_SWAP32(&numshapes);
/* Check that we could read all previous values */
if (nFReadAcc != 1 + 2 + 2 + 1)
{
hDiskTree->sHooks.Error("I/O error");
return false;
}
/* Sanity checks to avoid int overflows in later computation */
if (offset > INT_MAX - sizeof(int))
{
hDiskTree->sHooks.Error("Invalid value for offset");
return false;
}
if (numshapes > (INT_MAX - offset - sizeof(int)) / sizeof(int) ||
numshapes > INT_MAX / sizeof(int) - *pnResultCount)
{
hDiskTree->sHooks.Error("Invalid value for numshapes");
return false;
}
/* -------------------------------------------------------------------- */
/* If we don't overlap this node at all, we can just fseek() */
/* pass this node info and all subnodes. */
/* -------------------------------------------------------------------- */
if (!SHPCheckBoundsOverlap(adfNodeBoundsMin, adfNodeBoundsMax,
padfBoundsMin, padfBoundsMax, 2))
{
offset += numshapes * sizeof(int) + sizeof(int);
hDiskTree->sHooks.FSeek(hDiskTree->fpQIX, offset, SEEK_CUR);
return true;
}
/* -------------------------------------------------------------------- */
/* Add all the shapeids at this node to our list. */
/* -------------------------------------------------------------------- */
if (numshapes > 0)
{
if (*pnResultCount + numshapes >
STATIC_CAST(unsigned int, *pnBufferMax))
{
int *pNewBuffer;
*pnBufferMax = (*pnResultCount + numshapes + 100) * 5 / 4;
if (STATIC_CAST(size_t, *pnBufferMax) > INT_MAX / sizeof(int))
*pnBufferMax = *pnResultCount + numshapes;
pNewBuffer = STATIC_CAST(
int *, realloc(*ppanResultBuffer, *pnBufferMax * sizeof(int)));
if (pNewBuffer == SHPLIB_NULLPTR)
{
hDiskTree->sHooks.Error("Out of memory error");
return false;
}
*ppanResultBuffer = pNewBuffer;
}
if (hDiskTree->sHooks.FRead(*ppanResultBuffer + *pnResultCount,
sizeof(int), numshapes,
hDiskTree->fpQIX) != numshapes)
{
hDiskTree->sHooks.Error("I/O error");
return false;
}
if (bNeedSwap)
{
for (i = 0; i < numshapes; i++)
SHP_SWAP32(*ppanResultBuffer + *pnResultCount + i);
}
*pnResultCount += numshapes;
}
/* -------------------------------------------------------------------- */
/* Process the subnodes. */
/* -------------------------------------------------------------------- */
if (hDiskTree->sHooks.FRead(&numsubnodes, 4, 1, hDiskTree->fpQIX) != 1)
{
hDiskTree->sHooks.Error("I/O error");
return false;
}
if (bNeedSwap)
SHP_SWAP32(&numsubnodes);
if (numsubnodes > 0 && nRecLevel == 32)
{
hDiskTree->sHooks.Error("Shape tree is too deep");
return false;
}
for (i = 0; i < numsubnodes; i++)
{
if (!SHPSearchDiskTreeNode(hDiskTree, padfBoundsMin, padfBoundsMax,
ppanResultBuffer, pnBufferMax, pnResultCount,
bNeedSwap, nRecLevel + 1))
return false;
}
return true;
}
/************************************************************************/
/* SHPTreeReadLibc() */
/************************************************************************/
static SAOffset SHPTreeReadLibc(void *p, SAOffset size, SAOffset nmemb,
SAFile file)
{
return STATIC_CAST(SAOffset, fread(p, STATIC_CAST(size_t, size),
STATIC_CAST(size_t, nmemb),
REINTERPRET_CAST(FILE *, file)));
}
/************************************************************************/
/* SHPTreeSeekLibc() */
/************************************************************************/
static SAOffset SHPTreeSeekLibc(SAFile file, SAOffset offset, int whence)
{
return STATIC_CAST(SAOffset, fseek(REINTERPRET_CAST(FILE *, file),
STATIC_CAST(long, offset), whence));
}
/************************************************************************/
/* SHPSearchDiskTree() */
/************************************************************************/
int SHPAPI_CALL1(*) SHPSearchDiskTree(FILE *fp, double *padfBoundsMin,
double *padfBoundsMax, int *pnShapeCount)
{
struct SHPDiskTreeInfo sDiskTree;
memset(&sDiskTree.sHooks, 0, sizeof(sDiskTree.sHooks));
/* We do not use SASetupDefaultHooks() because the FILE* */
/* is a libc FILE* */
sDiskTree.sHooks.FSeek = SHPTreeSeekLibc;
sDiskTree.sHooks.FRead = SHPTreeReadLibc;
sDiskTree.fpQIX = REINTERPRET_CAST(SAFile, fp);
return SHPSearchDiskTreeEx(&sDiskTree, padfBoundsMin, padfBoundsMax,
pnShapeCount);
}
/***********************************************************************/
/* SHPSearchDiskTreeEx() */
/************************************************************************/
int SHPAPI_CALL1(*)
SHPSearchDiskTreeEx(const SHPTreeDiskHandle hDiskTree,
double *padfBoundsMin, double *padfBoundsMax,
int *pnShapeCount)
{
int nBufferMax = 0;
unsigned char abyBuf[16];
int *panResultBuffer = SHPLIB_NULLPTR;
*pnShapeCount = 0;
/* -------------------------------------------------------------------- */
/* Read the header. */
/* -------------------------------------------------------------------- */
hDiskTree->sHooks.FSeek(hDiskTree->fpQIX, 0, SEEK_SET);
hDiskTree->sHooks.FRead(abyBuf, 16, 1, hDiskTree->fpQIX);
if (memcmp(abyBuf, "SQT", 3) != 0)
return SHPLIB_NULLPTR;
#if defined(SHP_BIG_ENDIAN)
bool bNeedSwap = abyBuf[3] != 2;
#else
bool bNeedSwap = abyBuf[3] != 1;
#endif
/* -------------------------------------------------------------------- */
/* Search through root node and its descendants. */
/* -------------------------------------------------------------------- */
if (!SHPSearchDiskTreeNode(hDiskTree, padfBoundsMin, padfBoundsMax,
&panResultBuffer, &nBufferMax, pnShapeCount,
bNeedSwap, 0))
{
if (panResultBuffer != SHPLIB_NULLPTR)
free(panResultBuffer);
*pnShapeCount = 0;
return SHPLIB_NULLPTR;
}
/* -------------------------------------------------------------------- */
/* Sort the id array */
/* -------------------------------------------------------------------- */
/* To distinguish between empty intersection from error case */
if (panResultBuffer == SHPLIB_NULLPTR)
panResultBuffer = STATIC_CAST(int *, calloc(1, sizeof(int)));
else
qsort(panResultBuffer, *pnShapeCount, sizeof(int), SHPTreeCompareInts);
return panResultBuffer;
}
/************************************************************************/
/* SHPGetSubNodeOffset() */
/* */
/* Determine how big all the subnodes of this node (and their */
/* children) will be. This will allow disk based searchers to */
/* seek past them all efficiently. */
/************************************************************************/
static int SHPGetSubNodeOffset(SHPTreeNode *node)
{
int i;
int offset = 0;
for (i = 0; i < node->nSubNodes; i++)
{
if (node->apsSubNode[i])
{
offset += 4 * sizeof(double) +
(node->apsSubNode[i]->nShapeCount + 3) * sizeof(int);
offset += SHPGetSubNodeOffset(node->apsSubNode[i]);
}
}
return (offset);
}
/************************************************************************/
/* SHPWriteTreeNode() */
/************************************************************************/
static void SHPWriteTreeNode(SAFile fp, SHPTreeNode *node,
const SAHooks *psHooks)
{
int i, j;
int offset;
unsigned char *pabyRec;
assert(SHPLIB_NULLPTR != node);
offset = SHPGetSubNodeOffset(node);