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mapshape.c
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/******************************************************************************
* $Id$
*
* Project: MapServer
* Purpose: Implements support for shapefile access.
* Authors: Steve Lime and Frank Warmerdam
*
* Note:
* This code is entirely based on the previous work of Frank Warmerdam. It is
* essentially shapelib 1.1.5. However, there were enough changes that it was
* incorporated into the MapServer source to avoid confusion. Relicensed with
* permission of Frank Warmerdam (shapelib author). See the README
* for licence details.
*
******************************************************************************
* Copyright (c) 1996-2005 Regents of the University of Minnesota.
*
* 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 of this Software or works derived from this 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 <limits.h>
#include <assert.h>
#include "mapserver.h"
/* Only use this macro on 32-bit integers! */
#define SWAP_FOUR_BYTES(data) \
( ((data >> 24) & 0x000000FF) | ((data >> 8) & 0x0000FF00) | \
((data << 8) & 0x00FF0000) | ((data << 24) & 0xFF000000) )
#define ByteCopy( a, b, c ) memcpy( b, a, c )
static int bBigEndian;
/************************************************************************/
/* SwapWord() */
/* */
/* Swap a 2, 4 or 8 byte word. */
/************************************************************************/
static void SwapWord( int length, void * wordP )
{
int i;
uchar temp;
for( i=0; i < length/2; i++ ) {
temp = ((uchar *) wordP)[i];
((uchar *)wordP)[i] = ((uchar *) wordP)[length-i-1];
((uchar *) wordP)[length-i-1] = temp;
}
}
/************************************************************************/
/* SfRealloc() */
/* */
/* A realloc cover function that will access a NULL pointer as */
/* a valid input. */
/************************************************************************/
static void * SfRealloc( void * pMem, int nNewSize )
{
if( pMem == NULL )
return( (void *) malloc(nNewSize) );
else
return( (void *) realloc(pMem,nNewSize) );
}
/************************************************************************/
/* writeHeader() */
/* */
/* Write out a header for the .shp and .shx files as well as the */
/* contents of the index (.shx) file. */
/************************************************************************/
static void writeHeader( SHPHandle psSHP )
{
uchar abyHeader[100];
int i;
ms_int32 i32;
double dValue;
ms_int32 *panSHX;
/* -------------------------------------------------------------------- */
/* Prepare header block for .shp file. */
/* -------------------------------------------------------------------- */
for( i = 0; i < 100; i++ )
abyHeader[i] = 0;
abyHeader[2] = 0x27; /* magic cookie */
abyHeader[3] = 0x0a;
i32 = psSHP->nFileSize/2; /* file size */
ByteCopy( &i32, abyHeader+24, 4 );
if( !bBigEndian ) SwapWord( 4, abyHeader+24 );
i32 = 1000; /* version */
ByteCopy( &i32, abyHeader+28, 4 );
if( bBigEndian ) SwapWord( 4, abyHeader+28 );
i32 = psSHP->nShapeType; /* shape type */
ByteCopy( &i32, abyHeader+32, 4 );
if( bBigEndian ) SwapWord( 4, abyHeader+32 );
dValue = psSHP->adBoundsMin[0]; /* set bounds */
ByteCopy( &dValue, abyHeader+36, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+36 );
dValue = psSHP->adBoundsMin[1];
ByteCopy( &dValue, abyHeader+44, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+44 );
dValue = psSHP->adBoundsMax[0];
ByteCopy( &dValue, abyHeader+52, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+52 );
dValue = psSHP->adBoundsMax[1];
ByteCopy( &dValue, abyHeader+60, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+60 );
dValue = psSHP->adBoundsMin[2]; /* z */
ByteCopy( &dValue, abyHeader+68, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+68 );
dValue = psSHP->adBoundsMax[2];
ByteCopy( &dValue, abyHeader+76, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+76 );
dValue = psSHP->adBoundsMin[3]; /* m */
ByteCopy( &dValue, abyHeader+84, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+84 );
dValue = psSHP->adBoundsMax[3];
ByteCopy( &dValue, abyHeader+92, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+92 );
/* -------------------------------------------------------------------- */
/* Write .shp file header. */
/* -------------------------------------------------------------------- */
fseek( psSHP->fpSHP, 0, 0 );
fwrite( abyHeader, 100, 1, psSHP->fpSHP );
/* -------------------------------------------------------------------- */
/* Prepare, and write .shx file header. */
/* -------------------------------------------------------------------- */
i32 = (psSHP->nRecords * 2 * sizeof(ms_int32) + 100)/2; /* file size */
ByteCopy( &i32, abyHeader+24, 4 );
if( !bBigEndian ) SwapWord( 4, abyHeader+24 );
fseek( psSHP->fpSHX, 0, 0 );
fwrite( abyHeader, 100, 1, psSHP->fpSHX );
/* -------------------------------------------------------------------- */
/* Write out the .shx contents. */
/* -------------------------------------------------------------------- */
panSHX = (ms_int32 *) msSmallMalloc(sizeof(ms_int32) * 2 * psSHP->nRecords);
for( i = 0; i < psSHP->nRecords; i++ ) {
panSHX[i*2 ] = psSHP->panRecOffset[i]/2;
panSHX[i*2+1] = psSHP->panRecSize[i]/2;
if( !bBigEndian ) {
*(panSHX+i*2) = SWAP_FOUR_BYTES(*(panSHX+i*2));
*(panSHX+i*2+1) = SWAP_FOUR_BYTES(*(panSHX+i*2+1));
}
}
fwrite( panSHX, sizeof(ms_int32) * 2, psSHP->nRecords, psSHP->fpSHX );
free( panSHX );
}
/************************************************************************/
/* msSHPOpen() */
/* */
/* Open the .shp and .shx files based on the basename of the */
/* files or either file name. */
/************************************************************************/
SHPHandle msSHPOpen( const char * pszLayer, const char * pszAccess )
{
char *pszFullname, *pszBasename;
SHPHandle psSHP;
uchar *pabyBuf;
int i;
double dValue;
/* -------------------------------------------------------------------- */
/* Ensure the access string is one of the legal ones. We */
/* ensure the result string indicates binary to avoid common */
/* problems on Windows. */
/* -------------------------------------------------------------------- */
if( strcmp(pszAccess,"rb+") == 0 || strcmp(pszAccess,"r+b") == 0 || strcmp(pszAccess,"r+") == 0 )
pszAccess = "r+b";
else
pszAccess = "rb";
/* -------------------------------------------------------------------- */
/* Establish the byte order on this machine. */
/* -------------------------------------------------------------------- */
i = 1;
if( *((uchar *) &i) == 1 )
bBigEndian = MS_FALSE;
else
bBigEndian = MS_TRUE;
/* -------------------------------------------------------------------- */
/* Initialize the info structure. */
/* -------------------------------------------------------------------- */
psSHP = (SHPHandle) msSmallMalloc(sizeof(SHPInfo));
psSHP->bUpdated = MS_FALSE;
psSHP->pabyRec = NULL;
psSHP->panParts = NULL;
psSHP->nBufSize = psSHP->nPartMax = 0;
/* -------------------------------------------------------------------- */
/* Compute the base (layer) name. If there is any extension */
/* on the passed in filename we will strip it off. */
/* -------------------------------------------------------------------- */
pszBasename = (char *) msSmallMalloc(strlen(pszLayer)+5);
strcpy( pszBasename, pszLayer );
for( i = strlen(pszBasename)-1;
i > 0 && pszBasename[i] != '.' && pszBasename[i] != '/' && pszBasename[i] != '\\';
i-- ) {}
if( pszBasename[i] == '.' )
pszBasename[i] = '\0';
/* -------------------------------------------------------------------- */
/* Open the .shp and .shx files. Note that files pulled from */
/* a PC to Unix with upper case filenames won't work! */
/* -------------------------------------------------------------------- */
pszFullname = (char *) msSmallMalloc(strlen(pszBasename) + 5);
sprintf( pszFullname, "%s.shp", pszBasename );
psSHP->fpSHP = fopen(pszFullname, pszAccess );
if( psSHP->fpSHP == NULL ) {
msFree(pszBasename);
msFree(pszFullname);
msFree(psSHP);
return( NULL );
}
sprintf( pszFullname, "%s.shx", pszBasename );
psSHP->fpSHX = fopen(pszFullname, pszAccess );
if( psSHP->fpSHX == NULL ) {
msFree(pszBasename);
msFree(pszFullname);
msFree(psSHP);
return( NULL );
}
free( pszFullname );
free( pszBasename );
/* -------------------------------------------------------------------- */
/* Read the file size from the SHP file. */
/* -------------------------------------------------------------------- */
pabyBuf = (uchar *) msSmallMalloc(100);
fread( pabyBuf, 100, 1, psSHP->fpSHP );
psSHP->nFileSize = (pabyBuf[24] * 256 * 256 * 256
+ pabyBuf[25] * 256 * 256
+ pabyBuf[26] * 256
+ pabyBuf[27]) * 2;
/* -------------------------------------------------------------------- */
/* Read SHX file Header info */
/* -------------------------------------------------------------------- */
fread( pabyBuf, 100, 1, psSHP->fpSHX );
if( pabyBuf[0] != 0 || pabyBuf[1] != 0 || pabyBuf[2] != 0x27 || (pabyBuf[3] != 0x0a && pabyBuf[3] != 0x0d) ) {
fclose( psSHP->fpSHP );
fclose( psSHP->fpSHX );
free( psSHP );
return( NULL );
}
psSHP->nRecords = pabyBuf[27] + pabyBuf[26] * 256 + pabyBuf[25] * 256 * 256 + pabyBuf[24] * 256 * 256 * 256;
if (psSHP->nRecords != 0)
psSHP->nRecords = (psSHP->nRecords*2 - 100) / 8;
if( psSHP->nRecords < 0 || psSHP->nRecords > 256000000 ) {
msSetError(MS_SHPERR, "Corrupted .shp file : nRecords = %d.", "msSHPOpen()",
psSHP->nRecords);
fclose( psSHP->fpSHP );
fclose( psSHP->fpSHX );
free( psSHP );
return( NULL );
}
psSHP->nShapeType = pabyBuf[32];
if( bBigEndian ) SwapWord( 8, pabyBuf+36 );
memcpy( &dValue, pabyBuf+36, 8 );
psSHP->adBoundsMin[0] = dValue;
if( bBigEndian ) SwapWord( 8, pabyBuf+44 );
memcpy( &dValue, pabyBuf+44, 8 );
psSHP->adBoundsMin[1] = dValue;
if( bBigEndian ) SwapWord( 8, pabyBuf+52 );
memcpy( &dValue, pabyBuf+52, 8 );
psSHP->adBoundsMax[0] = dValue;
if( bBigEndian ) SwapWord( 8, pabyBuf+60 );
memcpy( &dValue, pabyBuf+60, 8 );
psSHP->adBoundsMax[1] = dValue;
if( bBigEndian ) SwapWord( 8, pabyBuf+68 ); /* z */
memcpy( &dValue, pabyBuf+68, 8 );
psSHP->adBoundsMin[2] = dValue;
if( bBigEndian ) SwapWord( 8, pabyBuf+76 );
memcpy( &dValue, pabyBuf+76, 8 );
psSHP->adBoundsMax[2] = dValue;
if( bBigEndian ) SwapWord( 8, pabyBuf+84 ); /* m */
memcpy( &dValue, pabyBuf+84, 8 );
psSHP->adBoundsMin[3] = dValue;
if( bBigEndian ) SwapWord( 8, pabyBuf+92 );
memcpy( &dValue, pabyBuf+92, 8 );
psSHP->adBoundsMax[3] = dValue;
free( pabyBuf );
/* -------------------------------------------------------------------- */
/* Read the .shx file to get the offsets to each record in */
/* the .shp file. */
/* -------------------------------------------------------------------- */
psSHP->nMaxRecords = psSHP->nRecords;
/* Our in-memory cache of offset information */
psSHP->panRecOffset = (int *) malloc(sizeof(int) * psSHP->nMaxRecords );
/* Our in-memory cache of size information */
psSHP->panRecSize = (int *) malloc(sizeof(int) * psSHP->nMaxRecords );
/* The completeness information for our in-memory cache */
psSHP->panRecLoaded = msAllocBitArray( 1 + (psSHP->nMaxRecords / SHX_BUFFER_PAGE) ) ;
/* Is our in-memory cache completely populated? */
psSHP->panRecAllLoaded = 0;
/* malloc failed? clean up and shut down */
if (psSHP->panRecOffset == NULL ||
psSHP->panRecSize == NULL ||
psSHP->panRecLoaded == NULL) {
free(psSHP->panRecOffset);
free(psSHP->panRecSize);
free(psSHP->panRecLoaded);
fclose( psSHP->fpSHP );
fclose( psSHP->fpSHX );
free( psSHP );
msSetError(MS_MEMERR, "Out of memory", "msSHPOpen()");
return( NULL );
}
return( psSHP );
}
/************************************************************************/
/* msSHPClose() */
/* */
/* Close the .shp and .shx files. */
/************************************************************************/
void msSHPClose(SHPHandle psSHP )
{
/* -------------------------------------------------------------------- */
/* Update the header if we have modified anything. */
/* -------------------------------------------------------------------- */
if( psSHP->bUpdated )
writeHeader( psSHP );
/* -------------------------------------------------------------------- */
/* Free all resources, and close files. */
/* -------------------------------------------------------------------- */
free( psSHP->panRecOffset );
free( psSHP->panRecSize );
free( psSHP->panRecLoaded );
if(psSHP->pabyRec) free(psSHP->pabyRec);
if(psSHP->panParts) free(psSHP->panParts);
fclose( psSHP->fpSHX );
fclose( psSHP->fpSHP );
free( psSHP );
}
/************************************************************************/
/* msSHPGetInfo() */
/* */
/* Fetch general information about the shape file. */
/************************************************************************/
void msSHPGetInfo(SHPHandle psSHP, int * pnEntities, int * pnShapeType )
{
if( pnEntities )
*pnEntities = psSHP->nRecords;
if( pnShapeType )
*pnShapeType = psSHP->nShapeType;
}
/************************************************************************/
/* msSHPCreate() */
/* */
/* Create a new shape file and return a handle to the open */
/* shape file with read/write access. */
/************************************************************************/
SHPHandle msSHPCreate( const char * pszLayer, int nShapeType )
{
char *pszBasename, *pszFullname;
int i;
FILE *fpSHP, *fpSHX;
uchar abyHeader[100];
ms_int32 i32;
double dValue;
#ifndef USE_POINT_Z_M
if( nShapeType == SHP_POLYGONZ
|| nShapeType == SHP_POLYGONM
|| nShapeType == SHP_ARCZ
|| nShapeType == SHP_ARCM
|| nShapeType == SHP_POINTZ
|| nShapeType == SHP_POINTM
|| nShapeType == SHP_MULTIPOINTZ
|| nShapeType == SHP_MULTIPOINTM ) {
msSetError( MS_SHPERR,
"Attempt to create M/Z shapefile but without having enabled Z/M support.",
"msSHPCreate()" );
return NULL;
}
#endif
/* -------------------------------------------------------------------- */
/* Establish the byte order on this system. */
/* -------------------------------------------------------------------- */
i = 1;
if( *((uchar *) &i) == 1 )
bBigEndian = MS_FALSE;
else
bBigEndian = MS_TRUE;
/* -------------------------------------------------------------------- */
/* Compute the base (layer) name. If there is any extension */
/* on the passed in filename we will strip it off. */
/* -------------------------------------------------------------------- */
pszBasename = (char *) msSmallMalloc(strlen(pszLayer)+5);
strcpy( pszBasename, pszLayer );
for( i = strlen(pszBasename)-1;
i > 0 && pszBasename[i] != '.' && pszBasename[i] != '/' && pszBasename[i] != '\\';
i-- ) {}
if( pszBasename[i] == '.' )
pszBasename[i] = '\0';
/* -------------------------------------------------------------------- */
/* Open the two files so we can write their headers. */
/* -------------------------------------------------------------------- */
pszFullname = (char *) msSmallMalloc(strlen(pszBasename) + 5);
sprintf( pszFullname, "%s.shp", pszBasename );
fpSHP = fopen(pszFullname, "wb" );
if( fpSHP == NULL )
return( NULL );
sprintf( pszFullname, "%s.shx", pszBasename );
fpSHX = fopen(pszFullname, "wb" );
if( fpSHX == NULL )
return( NULL );
free( pszFullname );
/* -------------------------------------------------------------------- */
/* Prepare header block for .shp file. */
/* -------------------------------------------------------------------- */
for( i = 0; i < 100; i++ )
abyHeader[i] = 0;
abyHeader[2] = 0x27; /* magic cookie */
abyHeader[3] = 0x0a;
i32 = 50; /* file size */
ByteCopy( &i32, abyHeader+24, 4 );
if( !bBigEndian ) SwapWord( 4, abyHeader+24 );
i32 = 1000; /* version */
ByteCopy( &i32, abyHeader+28, 4 );
if( bBigEndian ) SwapWord( 4, abyHeader+28 );
i32 = nShapeType; /* shape type */
ByteCopy( &i32, abyHeader+32, 4 );
if( bBigEndian ) SwapWord( 4, abyHeader+32 );
dValue = 0.0; /* set bounds */
ByteCopy( &dValue, abyHeader+36, 8 );
ByteCopy( &dValue, abyHeader+44, 8 );
ByteCopy( &dValue, abyHeader+52, 8 );
ByteCopy( &dValue, abyHeader+60, 8 );
/* -------------------------------------------------------------------- */
/* Write .shp file header. */
/* -------------------------------------------------------------------- */
fwrite( abyHeader, 100, 1, fpSHP );
/* -------------------------------------------------------------------- */
/* Prepare, and write .shx file header. */
/* -------------------------------------------------------------------- */
i32 = 50; /* file size */
ByteCopy( &i32, abyHeader+24, 4 );
if( !bBigEndian ) SwapWord( 4, abyHeader+24 );
fwrite( abyHeader, 100, 1, fpSHX );
/* -------------------------------------------------------------------- */
/* Close the files, and then open them as regular existing files. */
/* -------------------------------------------------------------------- */
fclose( fpSHP );
fclose( fpSHX );
return( msSHPOpen( pszLayer, "rb+" ) );
}
/************************************************************************/
/* writeBounds() */
/* */
/* Compute a bounds rectangle for a shape, and set it into the */
/* indicated location in the record. */
/************************************************************************/
static void writeBounds( uchar * pabyRec, shapeObj *shape, int nVCount )
{
double dXMin, dXMax, dYMin, dYMax;
int i, j;
if( nVCount == 0 ) {
dXMin = dYMin = dXMax = dYMax = 0.0;
} else {
dXMin = dXMax = shape->line[0].point[0].x;
dYMin = dYMax = shape->line[0].point[0].y;
for( i=0; i<shape->numlines; i++ ) {
for( j=0; j<shape->line[i].numpoints; j++ ) {
dXMin = MS_MIN(dXMin, shape->line[i].point[j].x);
dXMax = MS_MAX(dXMax, shape->line[i].point[j].x);
dYMin = MS_MIN(dYMin, shape->line[i].point[j].y);
dYMax = MS_MAX(dYMax, shape->line[i].point[j].y);
}
}
}
if( bBigEndian ) {
SwapWord( 8, &dXMin );
SwapWord( 8, &dYMin );
SwapWord( 8, &dXMax );
SwapWord( 8, &dYMax );
}
ByteCopy( &dXMin, pabyRec + 0, 8 );
ByteCopy( &dYMin, pabyRec + 8, 8 );
ByteCopy( &dXMax, pabyRec + 16, 8 );
ByteCopy( &dYMax, pabyRec + 24, 8 );
}
int msSHPWritePoint(SHPHandle psSHP, pointObj *point )
{
int nRecordOffset, nRecordSize=0;
uchar *pabyRec;
ms_int32 i32, nPoints, nParts;
if( psSHP->nShapeType != SHP_POINT) return(-1);
psSHP->bUpdated = MS_TRUE;
/* Fill the SHX buffer if it is not already full. */
if( ! psSHP->panRecAllLoaded ) msSHXLoadAll( psSHP );
/* -------------------------------------------------------------------- */
/* Add the new entity to the in memory index. */
/* -------------------------------------------------------------------- */
psSHP->nRecords++;
if( psSHP->nRecords > psSHP->nMaxRecords ) {
psSHP->nMaxRecords = (int) (psSHP->nMaxRecords * 1.3 + 100);
psSHP->panRecOffset = (int *) SfRealloc(psSHP->panRecOffset,sizeof(int) * psSHP->nMaxRecords );
psSHP->panRecSize = (int *) SfRealloc(psSHP->panRecSize,sizeof(int) * psSHP->nMaxRecords );
}
/* -------------------------------------------------------------------- */
/* Compute a few things. */
/* -------------------------------------------------------------------- */
nPoints = 1;
nParts = 1;
/* -------------------------------------------------------------------- */
/* Initialize record. */
/* -------------------------------------------------------------------- */
psSHP->panRecOffset[psSHP->nRecords-1] = nRecordOffset = psSHP->nFileSize;
pabyRec = (uchar *) msSmallMalloc(nPoints * 2 * sizeof(double) + nParts * 4 + 128);
/* -------------------------------------------------------------------- */
/* Write vertices for a point. */
/* -------------------------------------------------------------------- */
ByteCopy( &(point->x), pabyRec + 12, 8 );
ByteCopy( &(point->y), pabyRec + 20, 8 );
if( bBigEndian ) {
SwapWord( 8, pabyRec + 12 );
SwapWord( 8, pabyRec + 20 );
}
nRecordSize = 20;
/* -------------------------------------------------------------------- */
/* Set the shape type, record number, and record size. */
/* -------------------------------------------------------------------- */
i32 = psSHP->nRecords-1+1; /* record # */
if( !bBigEndian ) i32 = SWAP_FOUR_BYTES(i32);
ByteCopy( &i32, pabyRec, 4 );
i32 = nRecordSize/2; /* record size */
if( !bBigEndian ) i32 = SWAP_FOUR_BYTES(i32);
ByteCopy( &i32, pabyRec + 4, 4 );
i32 = psSHP->nShapeType; /* shape type */
if( bBigEndian ) i32 = SWAP_FOUR_BYTES(i32);
ByteCopy( &i32, pabyRec + 8, 4 );
/* -------------------------------------------------------------------- */
/* Write out record. */
/* -------------------------------------------------------------------- */
fseek( psSHP->fpSHP, nRecordOffset, 0 );
fwrite( pabyRec, nRecordSize+8, 1, psSHP->fpSHP );
free( pabyRec );
psSHP->panRecSize[psSHP->nRecords-1] = nRecordSize;
psSHP->nFileSize += nRecordSize + 8;
/* -------------------------------------------------------------------- */
/* Expand file wide bounds based on this shape. */
/* -------------------------------------------------------------------- */
if( psSHP->nRecords == 1 ) {
psSHP->adBoundsMin[0] = psSHP->adBoundsMax[0] = point->x;
psSHP->adBoundsMin[1] = psSHP->adBoundsMax[1] = point->y;
} else {
psSHP->adBoundsMin[0] = MS_MIN(psSHP->adBoundsMin[0], point->x);
psSHP->adBoundsMin[1] = MS_MIN(psSHP->adBoundsMin[1], point->y);
psSHP->adBoundsMax[0] = MS_MAX(psSHP->adBoundsMax[0], point->x);
psSHP->adBoundsMax[1] = MS_MAX(psSHP->adBoundsMax[1], point->y);
}
return( psSHP->nRecords - 1 );
}
int msSHPWriteShape(SHPHandle psSHP, shapeObj *shape )
{
int nRecordOffset, i, j, k, nRecordSize=0;
uchar *pabyRec;
int nShapeType;
ms_int32 i32, nPoints, nParts;
#ifdef USE_POINT_Z_M
double dfMMin, dfMMax = 0;
#endif
psSHP->bUpdated = MS_TRUE;
/* Fill the SHX buffer if it is not already full. */
if( ! psSHP->panRecAllLoaded ) msSHXLoadAll( psSHP );
/* -------------------------------------------------------------------- */
/* Add the new entity to the in memory index. */
/* -------------------------------------------------------------------- */
psSHP->nRecords++;
if( psSHP->nRecords > psSHP->nMaxRecords ) {
psSHP->nMaxRecords = (int) (psSHP->nMaxRecords * 1.3 + 100);
psSHP->panRecOffset = (int *) SfRealloc(psSHP->panRecOffset,sizeof(int) * psSHP->nMaxRecords );
psSHP->panRecSize = (int *) SfRealloc(psSHP->panRecSize,sizeof(int) * psSHP->nMaxRecords );
}
/* -------------------------------------------------------------------- */
/* Compute a few things. */
/* -------------------------------------------------------------------- */
nPoints = 0;
for(i=0; i<shape->numlines; i++)
nPoints += shape->line[i].numpoints;
nParts = shape->numlines;
/* -------------------------------------------------------------------- */
/* Initialize record. */
/* -------------------------------------------------------------------- */
psSHP->panRecOffset[psSHP->nRecords-1] = nRecordOffset = psSHP->nFileSize;
pabyRec = (uchar *) msSmallMalloc(nPoints * 4 * sizeof(double) + nParts * 8 + 128);
nShapeType = psSHP->nShapeType;
if (shape->type == MS_SHAPE_NULL) {
nShapeType = 0;
nRecordSize = 12;
}
/* -------------------------------------------------------------------- */
/* Write vertices for a Polygon or Arc. */
/* -------------------------------------------------------------------- */
else if(psSHP->nShapeType == SHP_POLYGON || psSHP->nShapeType == SHP_ARC ||
psSHP->nShapeType == SHP_POLYGONM || psSHP->nShapeType == SHP_ARCM ||
psSHP->nShapeType == SHP_ARCZ || psSHP->nShapeType == SHP_POLYGONZ) {
ms_int32 t_nParts, t_nPoints, partSize;
t_nParts = nParts;
t_nPoints = nPoints;
writeBounds( pabyRec + 12, shape, t_nPoints );
if( bBigEndian ) {
nPoints = SWAP_FOUR_BYTES(nPoints);
nParts = SWAP_FOUR_BYTES(nParts);
}
ByteCopy( &nPoints, pabyRec + 40 + 8, 4 );
ByteCopy( &nParts, pabyRec + 36 + 8, 4 );
partSize = 0; /* first part always starts at 0 */
ByteCopy( &partSize, pabyRec + 44 + 8 + 4*0, 4 );
if( bBigEndian ) SwapWord( 4, pabyRec + 44 + 8 + 4*0);
for( i = 1; i < t_nParts; i++ ) {
partSize += shape->line[i-1].numpoints;
ByteCopy( &partSize, pabyRec + 44 + 8 + 4*i, 4 );
if( bBigEndian ) SwapWord( 4, pabyRec + 44 + 8 + 4*i);
}
k = 0; /* overall point counter */
for( i = 0; i < shape->numlines; i++ ) {
for( j = 0; j < shape->line[i].numpoints; j++ ) {
ByteCopy( &(shape->line[i].point[j].x), pabyRec + 44 + 4*t_nParts + 8 + k * 16, 8 );
ByteCopy( &(shape->line[i].point[j].y), pabyRec + 44 + 4*t_nParts + 8 + k * 16 + 8, 8 );
if( bBigEndian ) {
SwapWord( 8, pabyRec + 44+4*t_nParts+8+k*16 );
SwapWord( 8, pabyRec + 44+4*t_nParts+8+k*16+8 );
}
k++;
}
}
nRecordSize = 44 + 4*t_nParts + 16 * t_nPoints;
#ifdef USE_POINT_Z_M
/* -------------------------------------------------------------------- */
/* measured shape : polygon and arc. */
/* -------------------------------------------------------------------- */
if(psSHP->nShapeType == SHP_POLYGONM || psSHP->nShapeType == SHP_ARCM) {
dfMMin = shape->line[0].point[0].m;
dfMMax = shape->line[shape->numlines-1].point[shape->line[shape->numlines-1].numpoints-1].m;
nRecordSize = 44 + 4*t_nParts + 8 + (t_nPoints* 16);
ByteCopy( &(dfMMin), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
ByteCopy( &(dfMMax), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
for( i = 0; i < shape->numlines; i++ ) {
for( j = 0; j < shape->line[i].numpoints; j++ ) {
ByteCopy( &(shape->line[i].point[j].m), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
}
}
}
/* -------------------------------------------------------------------- */
/* Polygon. Arc with Z */
/* -------------------------------------------------------------------- */
if (psSHP->nShapeType == SHP_POLYGONZ || psSHP->nShapeType == SHP_ARCZ
|| psSHP->nShapeType == SHP_POLYGONM || psSHP->nShapeType == SHP_ARCM) {
dfMMin = shape->line[0].point[0].z;
dfMMax = shape->line[shape->numlines-1].point[shape->line[shape->numlines-1].numpoints-1].z;
nRecordSize = 44 + 4*t_nParts + 8 + (t_nPoints* 16);
ByteCopy( &(dfMMin), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
ByteCopy( &(dfMMax), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
for( i = 0; i < shape->numlines; i++ ) {
for( j = 0; j < shape->line[i].numpoints; j++ ) {
ByteCopy( &(shape->line[i].point[j].z), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
}
}
}
#endif /* def USE_POINT_Z_M */
}
/* -------------------------------------------------------------------- */
/* Write vertices for a MultiPoint. */
/* -------------------------------------------------------------------- */
else if( psSHP->nShapeType == SHP_MULTIPOINT ||
psSHP->nShapeType == SHP_MULTIPOINTM ||
psSHP->nShapeType == SHP_MULTIPOINTZ) {
ms_int32 t_nPoints;
t_nPoints = nPoints;
writeBounds( pabyRec + 12, shape, nPoints );
if( bBigEndian ) nPoints = SWAP_FOUR_BYTES(nPoints);
ByteCopy( &nPoints, pabyRec + 44, 4 );
for( i = 0; i < shape->line[0].numpoints; i++ ) {
ByteCopy( &(shape->line[0].point[i].x), pabyRec + 48 + i*16, 8 );
ByteCopy( &(shape->line[0].point[i].y), pabyRec + 48 + i*16 + 8, 8 );
if( bBigEndian ) {
SwapWord( 8, pabyRec + 48 + i*16 );
SwapWord( 8, pabyRec + 48 + i*16 + 8 );
}
}
nRecordSize = 40 + 16 * t_nPoints;
#ifdef USE_POINT_Z_M
if (psSHP->nShapeType == SHP_MULTIPOINTM) {
dfMMin = shape->line[0].point[0].m;
dfMMax = shape->line[0].point[shape->line[0].numpoints-1].m;
ByteCopy( &(dfMMin), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
ByteCopy( &(dfMMax), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
for( i = 0; i < shape->line[0].numpoints; i++ ) {
ByteCopy( &(shape->line[0].point[i].m), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
}
}
if (psSHP->nShapeType == SHP_MULTIPOINTZ) {
dfMMin = shape->line[0].point[0].z;
dfMMax = shape->line[0].point[shape->line[0].numpoints-1].z;
ByteCopy( &(dfMMin), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
ByteCopy( &(dfMMax), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
for( i = 0; i < shape->line[0].numpoints; i++ ) {
ByteCopy( &(shape->line[0].point[i].z), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
}
}
#endif /* USE_POINT_Z_M */
}
/* -------------------------------------------------------------------- */
/* Write vertices for a point. */
/* -------------------------------------------------------------------- */
else if( psSHP->nShapeType == SHP_POINT || psSHP->nShapeType == SHP_POINTM ||
psSHP->nShapeType == SHP_POINTZ) {
ByteCopy( &(shape->line[0].point[0].x), pabyRec + 12, 8 );
ByteCopy( &(shape->line[0].point[0].y), pabyRec + 20, 8 );
if( bBigEndian ) {
SwapWord( 8, pabyRec + 12 );
SwapWord( 8, pabyRec + 20 );
}
nRecordSize = 20;
#ifdef USE_POINT_Z_M
if (psSHP->nShapeType == SHP_POINTM) {
ByteCopy( &(shape->line[0].point[0].m), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
}
if (psSHP->nShapeType == SHP_POINTZ) {
ByteCopy( &(shape->line[0].point[0].z), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
}
#endif /* USE_POINT_Z_M */
}
/* -------------------------------------------------------------------- */
/* Set the shape type, record number, and record size. */
/* -------------------------------------------------------------------- */
i32 = psSHP->nRecords-1+1; /* record # */
if( !bBigEndian ) i32 = SWAP_FOUR_BYTES(i32);
ByteCopy( &i32, pabyRec, 4 );
i32 = nRecordSize/2; /* record size */
if( !bBigEndian ) i32 = SWAP_FOUR_BYTES(i32);
ByteCopy( &i32, pabyRec + 4, 4 );
i32 = nShapeType; /* shape type */
if( bBigEndian ) i32 = SWAP_FOUR_BYTES(i32);
ByteCopy( &i32, pabyRec + 8, 4 );
/* -------------------------------------------------------------------- */
/* Write out record. */
/* -------------------------------------------------------------------- */
fseek( psSHP->fpSHP, nRecordOffset, 0 );
fwrite( pabyRec, nRecordSize+8, 1, psSHP->fpSHP );
free( pabyRec );
psSHP->panRecSize[psSHP->nRecords-1] = nRecordSize;
psSHP->nFileSize += nRecordSize + 8;
/* -------------------------------------------------------------------- */
/* Expand file wide bounds based on this shape. */
/* -------------------------------------------------------------------- */
if( psSHP->nRecords == 1 ) {
psSHP->adBoundsMin[0] = psSHP->adBoundsMax[0] = shape->line[0].point[0].x;
psSHP->adBoundsMin[1] = psSHP->adBoundsMax[1] = shape->line[0].point[0].y;
#ifdef USE_POINT_Z_M
psSHP->adBoundsMin[2] = psSHP->adBoundsMax[2] = shape->line[0].point[0].z;
psSHP->adBoundsMin[3] = psSHP->adBoundsMax[3] = shape->line[0].point[0].m;
#endif
}
for( i=0; i<shape->numlines; i++ ) {
for( j=0; j<shape->line[i].numpoints; j++ ) {
psSHP->adBoundsMin[0] = MS_MIN(psSHP->adBoundsMin[0], shape->line[i].point[j].x);
psSHP->adBoundsMin[1] = MS_MIN(psSHP->adBoundsMin[1], shape->line[i].point[j].y);
#ifdef USE_POINT_Z_M
psSHP->adBoundsMin[2] = MS_MIN(psSHP->adBoundsMin[2], shape->line[i].point[j].z);
psSHP->adBoundsMin[3] = MS_MIN(psSHP->adBoundsMin[3], shape->line[i].point[j].m);
#endif
psSHP->adBoundsMax[0] = MS_MAX(psSHP->adBoundsMax[0], shape->line[i].point[j].x);
psSHP->adBoundsMax[1] = MS_MAX(psSHP->adBoundsMax[1], shape->line[i].point[j].y);
#ifdef USE_POINT_Z_M
psSHP->adBoundsMax[2] = MS_MAX(psSHP->adBoundsMax[2], shape->line[i].point[j].z);
psSHP->adBoundsMax[3] = MS_MAX(psSHP->adBoundsMax[3], shape->line[i].point[j].m);
#endif
}
}
return( psSHP->nRecords - 1 );
}
/*
** msSHPReadAllocateBuffer() - Ensure our record buffer is large enough.
*/
static int msSHPReadAllocateBuffer( SHPHandle psSHP, int hEntity, const char* pszCallingFunction)
{
int nEntitySize = msSHXReadSize(psSHP, hEntity) + 8;
/* -------------------------------------------------------------------- */
/* Ensure our record buffer is large enough. */
/* -------------------------------------------------------------------- */
if( nEntitySize > psSHP->nBufSize ) {
psSHP->pabyRec = (uchar *) SfRealloc(psSHP->pabyRec,nEntitySize);
if (psSHP->pabyRec == NULL) {
/* Reallocate previous successfull size for following features */
psSHP->pabyRec = msSmallMalloc(psSHP->nBufSize);
msSetError(MS_MEMERR, "Out of memory. Cannot allocate %d bytes. Probably broken shapefile at feature %d",
pszCallingFunction, nEntitySize, hEntity);
return(MS_FAILURE);
}
psSHP->nBufSize = nEntitySize;
}
if (psSHP->pabyRec == NULL) {
msSetError(MS_MEMERR, "Out of memory", pszCallingFunction);