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4492 lines (4155 loc) · 139 KB
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/*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains code for implementations of the r-tree and r*-tree
** algorithms packaged as an SQLite virtual table module.
*/
/*
** Database Format of R-Tree Tables
** --------------------------------
**
** The data structure for a single virtual r-tree table is stored in three
** native SQLite tables declared as follows. In each case, the '%' character
** in the table name is replaced with the user-supplied name of the r-tree
** table.
**
** CREATE TABLE %_node(nodeno INTEGER PRIMARY KEY, data BLOB)
** CREATE TABLE %_parent(nodeno INTEGER PRIMARY KEY, parentnode INTEGER)
** CREATE TABLE %_rowid(rowid INTEGER PRIMARY KEY, nodeno INTEGER, ...)
**
** The data for each node of the r-tree structure is stored in the %_node
** table. For each node that is not the root node of the r-tree, there is
** an entry in the %_parent table associating the node with its parent.
** And for each row of data in the table, there is an entry in the %_rowid
** table that maps from the entries rowid to the id of the node that it
** is stored on. If the r-tree contains auxiliary columns, those are stored
** on the end of the %_rowid table.
**
** The root node of an r-tree always exists, even if the r-tree table is
** empty. The nodeno of the root node is always 1. All other nodes in the
** table must be the same size as the root node. The content of each node
** is formatted as follows:
**
** 1. If the node is the root node (node 1), then the first 2 bytes
** of the node contain the tree depth as a big-endian integer.
** For non-root nodes, the first 2 bytes are left unused.
**
** 2. The next 2 bytes contain the number of entries currently
** stored in the node.
**
** 3. The remainder of the node contains the node entries. Each entry
** consists of a single 8-byte integer followed by an even number
** of 4-byte coordinates. For leaf nodes the integer is the rowid
** of a record. For internal nodes it is the node number of a
** child page.
*/
#if !defined(SQLITE_CORE) \
|| (defined(SQLITE_ENABLE_RTREE) && !defined(SQLITE_OMIT_VIRTUALTABLE))
#ifndef SQLITE_CORE
#include "sqlite3ext.h"
SQLITE_EXTENSION_INIT1
#else
#include "sqlite3.h"
#endif
sqlite3_int64 sqlite3GetToken(const unsigned char*,int*); /* In SQLite core */
#include <stddef.h>
/*
** If building separately, we will need some setup that is normally
** found in sqliteInt.h
*/
#if !defined(SQLITE_AMALGAMATION)
#include "sqlite3rtree.h"
typedef sqlite3_int64 i64;
typedef sqlite3_uint64 u64;
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;
#if !defined(NDEBUG) && !defined(SQLITE_DEBUG)
# define NDEBUG 1
#endif
#if defined(NDEBUG) && defined(SQLITE_DEBUG)
# undef NDEBUG
#endif
#if defined(SQLITE_COVERAGE_TEST) || defined(SQLITE_MUTATION_TEST)
# define SQLITE_OMIT_AUXILIARY_SAFETY_CHECKS 1
#endif
#if defined(SQLITE_OMIT_AUXILIARY_SAFETY_CHECKS)
# define ALWAYS(X) (1)
# define NEVER(X) (0)
#elif !defined(NDEBUG)
# define ALWAYS(X) ((X)?1:(assert(0),0))
# define NEVER(X) ((X)?(assert(0),1):0)
#else
# define ALWAYS(X) (X)
# define NEVER(X) (X)
#endif
#ifndef offsetof
# define offsetof(ST,M) ((size_t)((char*)&((ST*)0)->M - (char*)0))
#endif
#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
# define FLEXARRAY
#else
# define FLEXARRAY 1
#endif
#endif /* !defined(SQLITE_AMALGAMATION) */
/* Macro to check for 4-byte alignment. Only used inside of assert() */
#ifdef SQLITE_DEBUG
# define FOUR_BYTE_ALIGNED(X) ((((char*)(X) - (char*)0) & 3)==0)
#endif
#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
/* The following macro is used to suppress compiler warnings.
*/
#ifndef UNUSED_PARAMETER
# define UNUSED_PARAMETER(x) (void)(x)
#endif
typedef struct Rtree Rtree;
typedef struct RtreeCursor RtreeCursor;
typedef struct RtreeNode RtreeNode;
typedef struct RtreeCell RtreeCell;
typedef struct RtreeConstraint RtreeConstraint;
typedef struct RtreeMatchArg RtreeMatchArg;
typedef struct RtreeGeomCallback RtreeGeomCallback;
typedef union RtreeCoord RtreeCoord;
typedef struct RtreeSearchPoint RtreeSearchPoint;
/* The rtree may have between 1 and RTREE_MAX_DIMENSIONS dimensions. */
#define RTREE_MAX_DIMENSIONS 5
/* Maximum number of auxiliary columns */
#define RTREE_MAX_AUX_COLUMN 100
/* Size of hash table Rtree.aHash. This hash table is not expected to
** ever contain very many entries, so a fixed number of buckets is
** used.
*/
#define HASHSIZE 97
/* The xBestIndex method of this virtual table requires an estimate of
** the number of rows in the virtual table to calculate the costs of
** various strategies. If possible, this estimate is loaded from the
** sqlite_stat1 table (with RTREE_MIN_ROWEST as a hard-coded minimum).
** Otherwise, if no sqlite_stat1 entry is available, use
** RTREE_DEFAULT_ROWEST.
*/
#define RTREE_DEFAULT_ROWEST 1048576
#define RTREE_MIN_ROWEST 100
/*
** An rtree virtual-table object.
*/
struct Rtree {
sqlite3_vtab base; /* Base class. Must be first */
sqlite3 *db; /* Host database connection */
int iNodeSize; /* Size in bytes of each node in the node table */
u8 nDim; /* Number of dimensions */
u8 nDim2; /* Twice the number of dimensions */
u8 eCoordType; /* RTREE_COORD_REAL32 or RTREE_COORD_INT32 */
u8 nBytesPerCell; /* Bytes consumed per cell */
u8 inWrTrans; /* True if inside write transaction */
u16 nAux; /* # of auxiliary columns in %_rowid */
#ifdef SQLITE_ENABLE_GEOPOLY
u8 nAuxNotNull; /* Number of initial not-null aux columns */
#endif
#ifdef SQLITE_DEBUG
u8 bCorrupt; /* Shadow table corruption detected */
#endif
int iDepth; /* Current depth of the r-tree structure */
char *zDb; /* Name of database containing r-tree table */
char *zName; /* Name of r-tree table */
char *zNodeName; /* Name of the %_node table */
u32 nBusy; /* Current number of users of this structure */
i64 nRowEst; /* Estimated number of rows in this table */
u32 nCursor; /* Number of open cursors */
u32 nNodeRef; /* Number RtreeNodes with positive nRef */
char *zReadAuxSql; /* SQL for statement to read aux data */
/* List of nodes removed during a CondenseTree operation. List is
** linked together via the pointer normally used for hash chains -
** RtreeNode.pNext. RtreeNode.iNode stores the depth of the sub-tree
** headed by the node (leaf nodes have RtreeNode.iNode==0).
*/
RtreeNode *pDeleted;
/* Blob I/O on xxx_node */
sqlite3_blob *pNodeBlob;
/* Statements to read/write/delete a record from xxx_node */
sqlite3_stmt *pWriteNode;
sqlite3_stmt *pDeleteNode;
/* Statements to read/write/delete a record from xxx_rowid */
sqlite3_stmt *pReadRowid;
sqlite3_stmt *pWriteRowid;
sqlite3_stmt *pDeleteRowid;
/* Statements to read/write/delete a record from xxx_parent */
sqlite3_stmt *pReadParent;
sqlite3_stmt *pWriteParent;
sqlite3_stmt *pDeleteParent;
/* Statement for writing to the "aux:" fields, if there are any */
sqlite3_stmt *pWriteAux;
RtreeNode *aHash[HASHSIZE]; /* Hash table of in-memory nodes. */
};
/* Possible values for Rtree.eCoordType: */
#define RTREE_COORD_REAL32 0
#define RTREE_COORD_INT32 1
/*
** If SQLITE_RTREE_INT_ONLY is defined, then this virtual table will
** only deal with integer coordinates. No floating point operations
** will be done.
*/
#ifdef SQLITE_RTREE_INT_ONLY
typedef sqlite3_int64 RtreeDValue; /* High accuracy coordinate */
typedef int RtreeValue; /* Low accuracy coordinate */
# define RTREE_ZERO 0
#else
typedef double RtreeDValue; /* High accuracy coordinate */
typedef float RtreeValue; /* Low accuracy coordinate */
# define RTREE_ZERO 0.0
#endif
/*
** Set the Rtree.bCorrupt flag
*/
#ifdef SQLITE_DEBUG
# define RTREE_IS_CORRUPT(X) ((X)->bCorrupt = 1)
#else
# define RTREE_IS_CORRUPT(X)
#endif
/*
** When doing a search of an r-tree, instances of the following structure
** record intermediate results from the tree walk.
**
** The id is always a node-id. For iLevel>=1 the id is the node-id of
** the node that the RtreeSearchPoint represents. When iLevel==0, however,
** the id is of the parent node and the cell that RtreeSearchPoint
** represents is the iCell-th entry in the parent node.
*/
struct RtreeSearchPoint {
RtreeDValue rScore; /* The score for this node. Smallest goes first. */
sqlite3_int64 id; /* Node ID */
u8 iLevel; /* 0=entries. 1=leaf node. 2+ for higher */
u8 eWithin; /* PARTLY_WITHIN or FULLY_WITHIN */
u8 iCell; /* Cell index within the node */
};
/*
** The minimum number of cells allowed for a node is a third of the
** maximum. In Gutman's notation:
**
** m = M/3
**
** If an R*-tree "Reinsert" operation is required, the same number of
** cells are removed from the overfull node and reinserted into the tree.
*/
#define RTREE_MINCELLS(p) ((((p)->iNodeSize-4)/(p)->nBytesPerCell)/3)
#define RTREE_REINSERT(p) RTREE_MINCELLS(p)
#define RTREE_MAXCELLS 51
/*
** The smallest possible node-size is (512-64)==448 bytes. And the largest
** supported cell size is 48 bytes (8 byte rowid + ten 4 byte coordinates).
** Therefore all non-root nodes must contain at least 3 entries. Since
** 3^40 is greater than 2^64, an r-tree structure always has a depth of
** 40 or less.
*/
#define RTREE_MAX_DEPTH 40
/*
** Number of entries in the cursor RtreeNode cache. The first entry is
** used to cache the RtreeNode for RtreeCursor.sPoint. The remaining
** entries cache the RtreeNode for the first elements of the priority queue.
*/
#define RTREE_CACHE_SZ 5
/*
** An rtree cursor object.
*/
struct RtreeCursor {
sqlite3_vtab_cursor base; /* Base class. Must be first */
u8 atEOF; /* True if at end of search */
u8 bPoint; /* True if sPoint is valid */
u8 bAuxValid; /* True if pReadAux is valid */
int iStrategy; /* Copy of idxNum search parameter */
int nConstraint; /* Number of entries in aConstraint */
RtreeConstraint *aConstraint; /* Search constraints. */
int nPointAlloc; /* Number of slots allocated for aPoint[] */
int nPoint; /* Number of slots used in aPoint[] */
int mxLevel; /* iLevel value for root of the tree */
RtreeSearchPoint *aPoint; /* Priority queue for search points */
sqlite3_stmt *pReadAux; /* Statement to read aux-data */
RtreeSearchPoint sPoint; /* Cached next search point */
RtreeNode *aNode[RTREE_CACHE_SZ]; /* Rtree node cache */
u32 anQueue[RTREE_MAX_DEPTH+1]; /* Number of queued entries by iLevel */
};
/* Return the Rtree of a RtreeCursor */
#define RTREE_OF_CURSOR(X) ((Rtree*)((X)->base.pVtab))
/*
** A coordinate can be either a floating point number or a integer. All
** coordinates within a single R-Tree are always of the same time.
*/
union RtreeCoord {
RtreeValue f; /* Floating point value */
int i; /* Integer value */
u32 u; /* Unsigned for byte-order conversions */
};
/*
** The argument is an RtreeCoord. Return the value stored within the RtreeCoord
** formatted as a RtreeDValue (double or int64). This macro assumes that local
** variable pRtree points to the Rtree structure associated with the
** RtreeCoord.
*/
#ifdef SQLITE_RTREE_INT_ONLY
# define DCOORD(coord) ((RtreeDValue)coord.i)
#else
# define DCOORD(coord) ( \
(pRtree->eCoordType==RTREE_COORD_REAL32) ? \
((double)coord.f) : \
((double)coord.i) \
)
#endif
/*
** A search constraint.
*/
struct RtreeConstraint {
int iCoord; /* Index of constrained coordinate */
int op; /* Constraining operation */
union {
RtreeDValue rValue; /* Constraint value. */
int (*xGeom)(sqlite3_rtree_geometry*,int,RtreeDValue*,int*);
int (*xQueryFunc)(sqlite3_rtree_query_info*);
} u;
sqlite3_rtree_query_info *pInfo; /* xGeom and xQueryFunc argument */
};
/* Possible values for RtreeConstraint.op */
#define RTREE_EQ 0x41 /* A */
#define RTREE_LE 0x42 /* B */
#define RTREE_LT 0x43 /* C */
#define RTREE_GE 0x44 /* D */
#define RTREE_GT 0x45 /* E */
#define RTREE_MATCH 0x46 /* F: Old-style sqlite3_rtree_geometry_callback() */
#define RTREE_QUERY 0x47 /* G: New-style sqlite3_rtree_query_callback() */
/* Special operators available only on cursors. Needs to be consecutive
** with the normal values above, but must be less than RTREE_MATCH. These
** are used in the cursor for contraints such as x=NULL (RTREE_FALSE) or
** x<'xyz' (RTREE_TRUE) */
#define RTREE_TRUE 0x3f /* ? */
#define RTREE_FALSE 0x40 /* @ */
/*
** An rtree structure node.
*/
struct RtreeNode {
RtreeNode *pParent; /* Parent node */
i64 iNode; /* The node number */
int nRef; /* Number of references to this node */
int isDirty; /* True if the node needs to be written to disk */
u8 *zData; /* Content of the node, as should be on disk */
RtreeNode *pNext; /* Next node in this hash collision chain */
};
/* Return the number of cells in a node */
#define NCELL(pNode) readInt16(&(pNode)->zData[2])
/*
** A single cell from a node, deserialized
*/
struct RtreeCell {
i64 iRowid; /* Node or entry ID */
RtreeCoord aCoord[RTREE_MAX_DIMENSIONS*2]; /* Bounding box coordinates */
};
/*
** This object becomes the sqlite3_user_data() for the SQL functions
** that are created by sqlite3_rtree_geometry_callback() and
** sqlite3_rtree_query_callback() and which appear on the right of MATCH
** operators in order to constrain a search.
**
** xGeom and xQueryFunc are the callback functions. Exactly one of
** xGeom and xQueryFunc fields is non-NULL, depending on whether the
** SQL function was created using sqlite3_rtree_geometry_callback() or
** sqlite3_rtree_query_callback().
**
** This object is deleted automatically by the destructor mechanism in
** sqlite3_create_function_v2().
*/
struct RtreeGeomCallback {
int (*xGeom)(sqlite3_rtree_geometry*, int, RtreeDValue*, int*);
int (*xQueryFunc)(sqlite3_rtree_query_info*);
void (*xDestructor)(void*);
void *pContext;
};
/*
** An instance of this structure (in the form of a BLOB) is returned by
** the SQL functions that sqlite3_rtree_geometry_callback() and
** sqlite3_rtree_query_callback() create, and is read as the right-hand
** operand to the MATCH operator of an R-Tree.
*/
struct RtreeMatchArg {
u32 iSize; /* Size of this object */
RtreeGeomCallback cb; /* Info about the callback functions */
int nParam; /* Number of parameters to the SQL function */
sqlite3_value **apSqlParam; /* Original SQL parameter values */
RtreeDValue aParam[FLEXARRAY]; /* Values for parameters to the SQL function */
};
/* Size of an RtreeMatchArg object with N parameters */
#define SZ_RTREEMATCHARG(N) \
(offsetof(RtreeMatchArg,aParam)+(N)*sizeof(RtreeDValue))
#ifndef MAX
# define MAX(x,y) ((x) < (y) ? (y) : (x))
#endif
#ifndef MIN
# define MIN(x,y) ((x) > (y) ? (y) : (x))
#endif
/* What version of GCC is being used. 0 means GCC is not being used .
** Note that the GCC_VERSION macro will also be set correctly when using
** clang, since clang works hard to be gcc compatible. So the gcc
** optimizations will also work when compiling with clang.
*/
#ifndef GCC_VERSION
#if defined(__GNUC__) && !defined(SQLITE_DISABLE_INTRINSIC)
# define GCC_VERSION (__GNUC__*1000000+__GNUC_MINOR__*1000+__GNUC_PATCHLEVEL__)
#else
# define GCC_VERSION 0
#endif
#endif
/* The testcase() macro should already be defined in the amalgamation. If
** it is not, make it a no-op.
*/
#ifndef SQLITE_AMALGAMATION
# if defined(SQLITE_COVERAGE_TEST) || defined(SQLITE_DEBUG)
unsigned int sqlite3RtreeTestcase = 0;
# define testcase(X) if( X ){ sqlite3RtreeTestcase += __LINE__; }
# else
# define testcase(X)
# endif
#endif
/*
** Make sure that the compiler intrinsics we desire are enabled when
** compiling with an appropriate version of MSVC unless prevented by
** the SQLITE_DISABLE_INTRINSIC define.
*/
#if !defined(SQLITE_DISABLE_INTRINSIC)
# if defined(_MSC_VER) && _MSC_VER>=1400
# if !defined(_WIN32_WCE)
# include <intrin.h>
# pragma intrinsic(_byteswap_ulong)
# pragma intrinsic(_byteswap_uint64)
# else
# include <cmnintrin.h>
# endif
# endif
#endif
/*
** Macros to determine whether the machine is big or little endian,
** and whether or not that determination is run-time or compile-time.
**
** For best performance, an attempt is made to guess at the byte-order
** using C-preprocessor macros. If that is unsuccessful, or if
** -DSQLITE_RUNTIME_BYTEORDER=1 is set, then byte-order is determined
** at run-time.
*/
#ifndef SQLITE_BYTEORDER /* Replicate changes at tag-20230904a */
# if defined(__BYTE_ORDER__) && __BYTE_ORDER__==__ORDER_BIG_ENDIAN__
# define SQLITE_BYTEORDER 4321
# elif defined(__BYTE_ORDER__) && __BYTE_ORDER__==__ORDER_LITTLE_ENDIAN__
# define SQLITE_BYTEORDER 1234
# elif defined(__BIG_ENDIAN__) && __BIG_ENDIAN__==1
# define SQLITE_BYTEORDER 4321
# elif defined(i386) || defined(__i386__) || defined(_M_IX86) || \
defined(__x86_64) || defined(__x86_64__) || defined(_M_X64) || \
defined(_M_AMD64) || defined(_M_ARM) || defined(__x86) || \
defined(__ARMEL__) || defined(__AARCH64EL__) || defined(_M_ARM64)
# define SQLITE_BYTEORDER 1234
# elif defined(sparc) || defined(__ARMEB__) || defined(__AARCH64EB__)
# define SQLITE_BYTEORDER 4321
# else
# define SQLITE_BYTEORDER 0
# endif
#endif
/* What version of MSVC is being used. 0 means MSVC is not being used */
#ifndef MSVC_VERSION
#if defined(_MSC_VER) && !defined(SQLITE_DISABLE_INTRINSIC)
# define MSVC_VERSION _MSC_VER
#else
# define MSVC_VERSION 0
#endif
#endif
/*
** Functions to deserialize a 16 bit integer, 32 bit real number and
** 64 bit integer. The deserialized value is returned.
*/
static int readInt16(u8 *p){
return (p[0]<<8) + p[1];
}
static void readCoord(u8 *p, RtreeCoord *pCoord){
assert( FOUR_BYTE_ALIGNED(p) );
#if SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300
pCoord->u = _byteswap_ulong(*(u32*)p);
#elif SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000
pCoord->u = __builtin_bswap32(*(u32*)p);
#elif SQLITE_BYTEORDER==4321
pCoord->u = *(u32*)p;
#else
pCoord->u = (
(((u32)p[0]) << 24) +
(((u32)p[1]) << 16) +
(((u32)p[2]) << 8) +
(((u32)p[3]) << 0)
);
#endif
}
static i64 readInt64(u8 *p){
#if SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300
u64 x;
memcpy(&x, p, 8);
return (i64)_byteswap_uint64(x);
#elif SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000
u64 x;
memcpy(&x, p, 8);
return (i64)__builtin_bswap64(x);
#elif SQLITE_BYTEORDER==4321
i64 x;
memcpy(&x, p, 8);
return x;
#else
return (i64)(
(((u64)p[0]) << 56) +
(((u64)p[1]) << 48) +
(((u64)p[2]) << 40) +
(((u64)p[3]) << 32) +
(((u64)p[4]) << 24) +
(((u64)p[5]) << 16) +
(((u64)p[6]) << 8) +
(((u64)p[7]) << 0)
);
#endif
}
/*
** Functions to serialize a 16 bit integer, 32 bit real number and
** 64 bit integer. The value returned is the number of bytes written
** to the argument buffer (always 2, 4 and 8 respectively).
*/
static void writeInt16(u8 *p, int i){
p[0] = (i>> 8)&0xFF;
p[1] = (i>> 0)&0xFF;
}
static int writeCoord(u8 *p, RtreeCoord *pCoord){
u32 i;
assert( FOUR_BYTE_ALIGNED(p) );
assert( sizeof(RtreeCoord)==4 );
assert( sizeof(u32)==4 );
#if SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000
i = __builtin_bswap32(pCoord->u);
memcpy(p, &i, 4);
#elif SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300
i = _byteswap_ulong(pCoord->u);
memcpy(p, &i, 4);
#elif SQLITE_BYTEORDER==4321
i = pCoord->u;
memcpy(p, &i, 4);
#else
i = pCoord->u;
p[0] = (i>>24)&0xFF;
p[1] = (i>>16)&0xFF;
p[2] = (i>> 8)&0xFF;
p[3] = (i>> 0)&0xFF;
#endif
return 4;
}
static int writeInt64(u8 *p, i64 i){
#if SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000
i = (i64)__builtin_bswap64((u64)i);
memcpy(p, &i, 8);
#elif SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300
i = (i64)_byteswap_uint64((u64)i);
memcpy(p, &i, 8);
#elif SQLITE_BYTEORDER==4321
memcpy(p, &i, 8);
#else
p[0] = (i>>56)&0xFF;
p[1] = (i>>48)&0xFF;
p[2] = (i>>40)&0xFF;
p[3] = (i>>32)&0xFF;
p[4] = (i>>24)&0xFF;
p[5] = (i>>16)&0xFF;
p[6] = (i>> 8)&0xFF;
p[7] = (i>> 0)&0xFF;
#endif
return 8;
}
/*
** Increment the reference count of node p.
*/
static void nodeReference(RtreeNode *p){
if( p ){
assert( p->nRef>0 );
p->nRef++;
}
}
/*
** Clear the content of node p (set all bytes to 0x00).
*/
static void nodeZero(Rtree *pRtree, RtreeNode *p){
memset(&p->zData[2], 0, pRtree->iNodeSize-2);
p->isDirty = 1;
}
/*
** Given a node number iNode, return the corresponding key to use
** in the Rtree.aHash table.
*/
static unsigned int nodeHash(i64 iNode){
return ((unsigned)iNode) % HASHSIZE;
}
/*
** Search the node hash table for node iNode. If found, return a pointer
** to it. Otherwise, return 0.
*/
static RtreeNode *nodeHashLookup(Rtree *pRtree, i64 iNode){
RtreeNode *p;
for(p=pRtree->aHash[nodeHash(iNode)]; p && p->iNode!=iNode; p=p->pNext);
return p;
}
/*
** Add node pNode to the node hash table.
*/
static void nodeHashInsert(Rtree *pRtree, RtreeNode *pNode){
int iHash;
assert( pNode->pNext==0 );
iHash = nodeHash(pNode->iNode);
pNode->pNext = pRtree->aHash[iHash];
pRtree->aHash[iHash] = pNode;
}
/*
** Remove node pNode from the node hash table.
*/
static void nodeHashDelete(Rtree *pRtree, RtreeNode *pNode){
RtreeNode **pp;
if( pNode->iNode!=0 ){
pp = &pRtree->aHash[nodeHash(pNode->iNode)];
for( ; (*pp)!=pNode; pp = &(*pp)->pNext){ assert(*pp); }
*pp = pNode->pNext;
pNode->pNext = 0;
}
}
/*
** Allocate and return new r-tree node. Initially, (RtreeNode.iNode==0),
** indicating that node has not yet been assigned a node number. It is
** assigned a node number when nodeWrite() is called to write the
** node contents out to the database.
*/
static RtreeNode *nodeNew(Rtree *pRtree, RtreeNode *pParent){
RtreeNode *pNode;
pNode = (RtreeNode *)sqlite3_malloc64(sizeof(RtreeNode) + pRtree->iNodeSize);
if( pNode ){
memset(pNode, 0, sizeof(RtreeNode) + pRtree->iNodeSize);
pNode->zData = (u8 *)&pNode[1];
pNode->nRef = 1;
pRtree->nNodeRef++;
pNode->pParent = pParent;
pNode->isDirty = 1;
nodeReference(pParent);
}
return pNode;
}
/*
** Clear the Rtree.pNodeBlob object
*/
static void nodeBlobReset(Rtree *pRtree){
sqlite3_blob *pBlob = pRtree->pNodeBlob;
pRtree->pNodeBlob = 0;
sqlite3_blob_close(pBlob);
}
/*
** Obtain a reference to an r-tree node.
*/
static int nodeAcquire(
Rtree *pRtree, /* R-tree structure */
i64 iNode, /* Node number to load */
RtreeNode *pParent, /* Either the parent node or NULL */
RtreeNode **ppNode /* OUT: Acquired node */
){
int rc = SQLITE_OK;
RtreeNode *pNode = 0;
/* Check if the requested node is already in the hash table. If so,
** increase its reference count and return it.
*/
if( (pNode = nodeHashLookup(pRtree, iNode))!=0 ){
if( pParent && ALWAYS(pParent!=pNode->pParent) ){
RTREE_IS_CORRUPT(pRtree);
return SQLITE_CORRUPT_VTAB;
}
pNode->nRef++;
*ppNode = pNode;
return SQLITE_OK;
}
if( pRtree->pNodeBlob ){
sqlite3_blob *pBlob = pRtree->pNodeBlob;
pRtree->pNodeBlob = 0;
rc = sqlite3_blob_reopen(pBlob, iNode);
pRtree->pNodeBlob = pBlob;
if( rc ){
nodeBlobReset(pRtree);
if( rc==SQLITE_NOMEM ) return SQLITE_NOMEM;
}
}
if( pRtree->pNodeBlob==0 ){
rc = sqlite3_blob_open(pRtree->db, pRtree->zDb, pRtree->zNodeName,
"data", iNode, 0,
&pRtree->pNodeBlob);
}
if( rc ){
*ppNode = 0;
/* If unable to open an sqlite3_blob on the desired row, that can only
** be because the shadow tables hold erroneous data. */
if( rc==SQLITE_ERROR ){
rc = SQLITE_CORRUPT_VTAB;
RTREE_IS_CORRUPT(pRtree);
}
}else if( iNode<=0 ){
RTREE_IS_CORRUPT(pRtree);
rc = SQLITE_CORRUPT_VTAB;
}else if( pRtree->iNodeSize==sqlite3_blob_bytes(pRtree->pNodeBlob) ){
pNode = (RtreeNode *)sqlite3_malloc64(sizeof(RtreeNode)+pRtree->iNodeSize);
if( !pNode ){
rc = SQLITE_NOMEM;
}else{
pNode->pParent = pParent;
pNode->zData = (u8 *)&pNode[1];
pNode->nRef = 1;
pRtree->nNodeRef++;
pNode->iNode = iNode;
pNode->isDirty = 0;
pNode->pNext = 0;
rc = sqlite3_blob_read(pRtree->pNodeBlob, pNode->zData,
pRtree->iNodeSize, 0);
}
}
/* If the root node was just loaded, set pRtree->iDepth to the height
** of the r-tree structure. A height of zero means all data is stored on
** the root node. A height of one means the children of the root node
** are the leaves, and so on. If the depth as specified on the root node
** is greater than RTREE_MAX_DEPTH, the r-tree structure must be corrupt.
*/
if( rc==SQLITE_OK && pNode && iNode==1 ){
pRtree->iDepth = readInt16(pNode->zData);
if( pRtree->iDepth>RTREE_MAX_DEPTH ){
rc = SQLITE_CORRUPT_VTAB;
RTREE_IS_CORRUPT(pRtree);
}
}
/* If no error has occurred so far, check if the "number of entries"
** field on the node is too large. If so, set the return code to
** SQLITE_CORRUPT_VTAB.
*/
if( pNode && rc==SQLITE_OK ){
if( NCELL(pNode)>((pRtree->iNodeSize-4)/pRtree->nBytesPerCell) ){
rc = SQLITE_CORRUPT_VTAB;
RTREE_IS_CORRUPT(pRtree);
}
}
if( rc==SQLITE_OK ){
if( pNode!=0 ){
nodeReference(pParent);
nodeHashInsert(pRtree, pNode);
}else{
rc = SQLITE_CORRUPT_VTAB;
RTREE_IS_CORRUPT(pRtree);
}
*ppNode = pNode;
}else{
nodeBlobReset(pRtree);
if( pNode ){
pRtree->nNodeRef--;
sqlite3_free(pNode);
}
*ppNode = 0;
}
return rc;
}
/*
** Overwrite cell iCell of node pNode with the contents of pCell.
*/
static void nodeOverwriteCell(
Rtree *pRtree, /* The overall R-Tree */
RtreeNode *pNode, /* The node into which the cell is to be written */
RtreeCell *pCell, /* The cell to write */
int iCell /* Index into pNode into which pCell is written */
){
int ii;
u8 *p = &pNode->zData[4 + pRtree->nBytesPerCell*iCell];
p += writeInt64(p, pCell->iRowid);
for(ii=0; ii<pRtree->nDim2; ii++){
p += writeCoord(p, &pCell->aCoord[ii]);
}
pNode->isDirty = 1;
}
/*
** Remove the cell with index iCell from node pNode.
*/
static void nodeDeleteCell(Rtree *pRtree, RtreeNode *pNode, int iCell){
u8 *pDst = &pNode->zData[4 + pRtree->nBytesPerCell*iCell];
u8 *pSrc = &pDst[pRtree->nBytesPerCell];
int nByte = (NCELL(pNode) - iCell - 1) * pRtree->nBytesPerCell;
memmove(pDst, pSrc, nByte);
writeInt16(&pNode->zData[2], NCELL(pNode)-1);
pNode->isDirty = 1;
}
/*
** Insert the contents of cell pCell into node pNode. If the insert
** is successful, return SQLITE_OK.
**
** If there is not enough free space in pNode, return SQLITE_FULL.
*/
static int nodeInsertCell(
Rtree *pRtree, /* The overall R-Tree */
RtreeNode *pNode, /* Write new cell into this node */
RtreeCell *pCell /* The cell to be inserted */
){
int nCell; /* Current number of cells in pNode */
int nMaxCell; /* Maximum number of cells for pNode */
nMaxCell = (pRtree->iNodeSize-4)/pRtree->nBytesPerCell;
nCell = NCELL(pNode);
assert( nCell<=nMaxCell );
if( nCell<nMaxCell ){
nodeOverwriteCell(pRtree, pNode, pCell, nCell);
writeInt16(&pNode->zData[2], nCell+1);
pNode->isDirty = 1;
}
return (nCell==nMaxCell);
}
/*
** If the node is dirty, write it out to the database.
*/
static int nodeWrite(Rtree *pRtree, RtreeNode *pNode){
int rc = SQLITE_OK;
if( pNode->isDirty ){
sqlite3_stmt *p = pRtree->pWriteNode;
if( pNode->iNode ){
sqlite3_bind_int64(p, 1, pNode->iNode);
}else{
sqlite3_bind_null(p, 1);
}
sqlite3_bind_blob(p, 2, pNode->zData, pRtree->iNodeSize, SQLITE_STATIC);
sqlite3_step(p);
pNode->isDirty = 0;
rc = sqlite3_reset(p);
sqlite3_bind_null(p, 2);
if( pNode->iNode==0 && rc==SQLITE_OK ){
pNode->iNode = sqlite3_last_insert_rowid(pRtree->db);
nodeHashInsert(pRtree, pNode);
}
}
return rc;
}
/*
** Release a reference to a node. If the node is dirty and the reference
** count drops to zero, the node data is written to the database.
*/
static int nodeRelease(Rtree *pRtree, RtreeNode *pNode){
int rc = SQLITE_OK;
if( pNode ){
assert( pNode->nRef>0 );
assert( pRtree->nNodeRef>0 );
pNode->nRef--;
if( pNode->nRef==0 ){
pRtree->nNodeRef--;
if( pNode->iNode==1 ){
pRtree->iDepth = -1;
}
if( pNode->pParent ){
rc = nodeRelease(pRtree, pNode->pParent);
}
if( rc==SQLITE_OK ){
rc = nodeWrite(pRtree, pNode);
}
nodeHashDelete(pRtree, pNode);
sqlite3_free(pNode);
}
}
return rc;
}
/*
** Return the 64-bit integer value associated with cell iCell of
** node pNode. If pNode is a leaf node, this is a rowid. If it is
** an internal node, then the 64-bit integer is a child page number.
*/
static i64 nodeGetRowid(
Rtree *pRtree, /* The overall R-Tree */
RtreeNode *pNode, /* The node from which to extract the ID */
int iCell /* The cell index from which to extract the ID */
){
assert( iCell<NCELL(pNode) );
return readInt64(&pNode->zData[4 + pRtree->nBytesPerCell*iCell]);
}
/*
** Return coordinate iCoord from cell iCell in node pNode.
*/
static void nodeGetCoord(
Rtree *pRtree, /* The overall R-Tree */
RtreeNode *pNode, /* The node from which to extract a coordinate */
int iCell, /* The index of the cell within the node */
int iCoord, /* Which coordinate to extract */
RtreeCoord *pCoord /* OUT: Space to write result to */
){
assert( iCell<NCELL(pNode) );
readCoord(&pNode->zData[12 + pRtree->nBytesPerCell*iCell + 4*iCoord], pCoord);
}
/*
** Deserialize cell iCell of node pNode. Populate the structure pointed
** to by pCell with the results.
*/
static void nodeGetCell(
Rtree *pRtree, /* The overall R-Tree */
RtreeNode *pNode, /* The node containing the cell to be read */
int iCell, /* Index of the cell within the node */
RtreeCell *pCell /* OUT: Write the cell contents here */
){
u8 *pData;
RtreeCoord *pCoord;
int ii = 0;
pCell->iRowid = nodeGetRowid(pRtree, pNode, iCell);
pData = pNode->zData + (12 + pRtree->nBytesPerCell*iCell);
pCoord = pCell->aCoord;
do{
readCoord(pData, &pCoord[ii]);
readCoord(pData+4, &pCoord[ii+1]);
pData += 8;
ii += 2;
}while( ii<pRtree->nDim2 );
}
/* Forward declaration for the function that does the work of
** the virtual table module xCreate() and xConnect() methods.
*/
static int rtreeInit(
sqlite3 *, void *, int, const char *const*, sqlite3_vtab **, char **, int
);
/*
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