/****************************************************************************** * $Id: shpopen.c,v 1.39 2002/08/26 06:46:56 warmerda Exp $ * * Project: Shapelib * Purpose: Implementation of core Shapefile read/write functions. * Author: Frank Warmerdam, warmerdam@pobox.com * ****************************************************************************** * Copyright (c) 1999, 2001, Frank Warmerdam * * This software is available under the following "MIT Style" license, * or at the option of the licensee under the LGPL (see LICENSE.LGPL). This * option is discussed in more detail in shapelib.html. * * -- * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. ****************************************************************************** * * $Log: shpopen.c,v $ * Revision 1.39 2002/08/26 06:46:56 warmerda * avoid c++ comments * * Revision 1.38 2002/05/07 16:43:39 warmerda * Removed debugging printf. * * Revision 1.37 2002/04/10 17:35:22 warmerda * fixed bug in ring reversal code * * Revision 1.36 2002/04/10 16:59:54 warmerda * added SHPRewindObject * * Revision 1.35 2001/12/07 15:10:44 warmerda * fix if .shx fails to open * * Revision 1.34 2001/11/01 16:29:55 warmerda * move pabyRec into SHPInfo for thread safety * * Revision 1.33 2001/07/03 12:18:15 warmerda * Improved cleanup if SHX not found, provied by Riccardo Cohen. * * Revision 1.32 2001/06/22 01:58:07 warmerda * be more careful about establishing initial bounds in face of NULL shapes * * Revision 1.31 2001/05/31 19:35:29 warmerda * added support for writing null shapes * * Revision 1.30 2001/05/28 12:46:29 warmerda * Add some checking on reasonableness of record count when opening. * * Revision 1.29 2001/05/23 13:36:52 warmerda * added use of SHPAPI_CALL * * Revision 1.28 2001/02/06 22:25:06 warmerda * fixed memory leaks when SHPOpen() fails * * Revision 1.27 2000/07/18 15:21:33 warmerda * added better enforcement of -1 for append in SHPWriteObject * * Revision 1.26 2000/02/16 16:03:51 warmerda * added null shape support * * Revision 1.25 1999/12/15 13:47:07 warmerda * Fixed record size settings in .shp file (was 4 words too long) * Added stdlib.h. * * Revision 1.24 1999/11/05 14:12:04 warmerda * updated license terms * * Revision 1.23 1999/07/27 00:53:46 warmerda * added support for rewriting shapes * * Revision 1.22 1999/06/11 19:19:11 warmerda * Cleanup pabyRec static buffer on SHPClose(). * * Revision 1.21 1999/06/02 14:57:56 kshih * Remove unused variables * * Revision 1.20 1999/04/19 21:04:17 warmerda * Fixed syntax error. * * Revision 1.19 1999/04/19 21:01:57 warmerda * Force access string to binary in SHPOpen(). * * Revision 1.18 1999/04/01 18:48:07 warmerda * Try upper case extensions if lower case doesn't work. * * Revision 1.17 1998/12/31 15:29:39 warmerda * Disable writing measure values to multipatch objects if * DISABLE_MULTIPATCH_MEASURE is defined. * * Revision 1.16 1998/12/16 05:14:33 warmerda * Added support to write MULTIPATCH. Fixed reading Z coordinate of * MULTIPATCH. Fixed record size written for all feature types. * * Revision 1.15 1998/12/03 16:35:29 warmerda * r+b is proper binary access string, not rb+. * * Revision 1.14 1998/12/03 15:47:56 warmerda * Fixed setting of nVertices in SHPCreateObject(). * * Revision 1.13 1998/12/03 15:33:54 warmerda * Made SHPCalculateExtents() separately callable. * * Revision 1.12 1998/11/11 20:01:50 warmerda * Fixed bug writing ArcM/Z, and PolygonM/Z for big endian machines. * * Revision 1.11 1998/11/09 20:56:44 warmerda * Fixed up handling of file wide bounds. * * Revision 1.10 1998/11/09 20:18:51 warmerda * Converted to support 3D shapefiles, and use of SHPObject. * * Revision 1.9 1998/02/24 15:09:05 warmerda * Fixed memory leak. * * Revision 1.8 1997/12/04 15:40:29 warmerda * Fixed byte swapping of record number, and record length fields in the * .shp file. * * Revision 1.7 1995/10/21 03:15:58 warmerda * Added support for binary file access, the magic cookie 9997 * and tried to improve the int32 selection logic for 16bit systems. * * Revision 1.6 1995/09/04 04:19:41 warmerda * Added fix for file bounds. * * Revision 1.5 1995/08/25 15:16:44 warmerda * Fixed a couple of problems with big endian systems ... one with bounds * and the other with multipart polygons. * * Revision 1.4 1995/08/24 18:10:17 warmerda * Switch to use SfRealloc() to avoid problems with pre-ANSI realloc() * functions (such as on the Sun). * * Revision 1.3 1995/08/23 02:23:15 warmerda * Added support for reading bounds, and fixed up problems in setting the * file wide bounds. * * Revision 1.2 1995/08/04 03:16:57 warmerda * Added header. * */ static char rcsid[] = "$Id: shpopen.c,v 1.39 2002/08/26 06:46:56 warmerda Exp $"; #include "shapefil.h" #include #include #include #include #include typedef unsigned char uchar; #if UINT_MAX == 65535 typedef long int32; #else typedef int int32; #endif #ifndef FALSE # define FALSE 0 # define TRUE 1 #endif #define ByteCopy( a, b, c ) memcpy( b, a, c ) #ifndef MAX # define MIN(a,b) ((ab) ? a : b) #endif 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) ); } /************************************************************************/ /* SHPWriteHeader() */ /* */ /* Write out a header for the .shp and .shx files as well as the */ /* contents of the index (.shx) file. */ /************************************************************************/ static void SHPWriteHeader( SHPHandle psSHP ) { uchar abyHeader[100]; int i; int32 i32; double dValue; 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(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 = (int32 *) malloc(sizeof(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 ) SwapWord( 4, panSHX+i*2 ); if( !bBigEndian ) SwapWord( 4, panSHX+i*2+1 ); } fwrite( panSHX, sizeof(int32) * 2, psSHP->nRecords, psSHP->fpSHX ); free( panSHX ); } /************************************************************************/ /* SHPOpen() */ /* */ /* Open the .shp and .shx files based on the basename of the */ /* files or either file name. */ /************************************************************************/ SHPHandle SHPAPI_CALL SHPOpen( 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 = FALSE; else bBigEndian = TRUE; /* -------------------------------------------------------------------- */ /* Initialize the info structure. */ /* -------------------------------------------------------------------- */ psSHP = (SHPHandle) calloc(sizeof(SHPInfo),1); psSHP->bUpdated = FALSE; /* -------------------------------------------------------------------- */ /* Compute the base (layer) name. If there is any extension */ /* on the passed in filename we will strip it off. */ /* -------------------------------------------------------------------- */ pszBasename = (char *) malloc(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 *) malloc(strlen(pszBasename) + 5); sprintf( pszFullname, "%s.shp", pszBasename ); psSHP->fpSHP = fopen(pszFullname, pszAccess ); if( psSHP->fpSHP == NULL ) { sprintf( pszFullname, "%s.SHP", pszBasename ); psSHP->fpSHP = fopen(pszFullname, pszAccess ); } if( psSHP->fpSHP == NULL ) { free( psSHP ); free( pszBasename ); free( pszFullname ); return( NULL ); } sprintf( pszFullname, "%s.shx", pszBasename ); psSHP->fpSHX = fopen(pszFullname, pszAccess ); if( psSHP->fpSHX == NULL ) { sprintf( pszFullname, "%s.SHX", pszBasename ); psSHP->fpSHX = fopen(pszFullname, pszAccess ); } if( psSHP->fpSHX == NULL ) { fclose( psSHP->fpSHP ); free( psSHP ); free( pszBasename ); free( pszFullname ); return( NULL ); } free( pszFullname ); free( pszBasename ); /* -------------------------------------------------------------------- */ /* Read the file size from the SHP file. */ /* -------------------------------------------------------------------- */ pabyBuf = (uchar *) malloc(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; psSHP->nRecords = (psSHP->nRecords*2 - 100) / 8; psSHP->nShapeType = pabyBuf[32]; if( psSHP->nRecords < 0 || psSHP->nRecords > 256000000 ) { /* this header appears to be corrupt. Give up. */ fclose( psSHP->fpSHP ); fclose( psSHP->fpSHX ); free( psSHP ); return( NULL ); } /* -------------------------------------------------------------------- */ /* Read the bounds. */ /* -------------------------------------------------------------------- */ 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 ); /* z */ 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; psSHP->panRecOffset = (int *) malloc(sizeof(int) * MAX(1,psSHP->nMaxRecords) ); psSHP->panRecSize = (int *) malloc(sizeof(int) * MAX(1,psSHP->nMaxRecords) ); pabyBuf = (uchar *) malloc(8 * MAX(1,psSHP->nRecords) ); fread( pabyBuf, 8, psSHP->nRecords, psSHP->fpSHX ); for( i = 0; i < psSHP->nRecords; i++ ) { int32 nOffset, nLength; memcpy( &nOffset, pabyBuf + i * 8, 4 ); if( !bBigEndian ) SwapWord( 4, &nOffset ); memcpy( &nLength, pabyBuf + i * 8 + 4, 4 ); if( !bBigEndian ) SwapWord( 4, &nLength ); psSHP->panRecOffset[i] = nOffset*2; psSHP->panRecSize[i] = nLength*2; } free( pabyBuf ); return( psSHP ); } /************************************************************************/ /* SHPClose() */ /* */ /* Close the .shp and .shx files. */ /************************************************************************/ void SHPAPI_CALL SHPClose(SHPHandle psSHP ) { /* -------------------------------------------------------------------- */ /* Update the header if we have modified anything. */ /* -------------------------------------------------------------------- */ if( psSHP->bUpdated ) { SHPWriteHeader( psSHP ); } /* -------------------------------------------------------------------- */ /* Free all resources, and close files. */ /* -------------------------------------------------------------------- */ free( psSHP->panRecOffset ); free( psSHP->panRecSize ); fclose( psSHP->fpSHX ); fclose( psSHP->fpSHP ); if( psSHP->pabyRec != NULL ) { free( psSHP->pabyRec ); } free( psSHP ); } /************************************************************************/ /* SHPGetInfo() */ /* */ /* Fetch general information about the shape file. */ /************************************************************************/ void SHPAPI_CALL SHPGetInfo(SHPHandle psSHP, int * pnEntities, int * pnShapeType, double * padfMinBound, double * padfMaxBound ) { int i; if( pnEntities != NULL ) *pnEntities = psSHP->nRecords; if( pnShapeType != NULL ) *pnShapeType = psSHP->nShapeType; for( i = 0; i < 4; i++ ) { if( padfMinBound != NULL ) padfMinBound[i] = psSHP->adBoundsMin[i]; if( padfMaxBound != NULL ) padfMaxBound[i] = psSHP->adBoundsMax[i]; } } /************************************************************************/ /* SHPCreate() */ /* */ /* Create a new shape file and return a handle to the open */ /* shape file with read/write access. */ /************************************************************************/ SHPHandle SHPAPI_CALL SHPCreate( const char * pszLayer, int nShapeType ) { char *pszBasename, *pszFullname; int i; FILE *fpSHP, *fpSHX; uchar abyHeader[100]; int32 i32; double dValue; /* -------------------------------------------------------------------- */ /* Establish the byte order on this system. */ /* -------------------------------------------------------------------- */ i = 1; if( *((uchar *) &i) == 1 ) bBigEndian = FALSE; else bBigEndian = TRUE; /* -------------------------------------------------------------------- */ /* Compute the base (layer) name. If there is any extension */ /* on the passed in filename we will strip it off. */ /* -------------------------------------------------------------------- */ pszBasename = (char *) malloc(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 *) malloc(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 ); free( pszBasename ); /* -------------------------------------------------------------------- */ /* 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( SHPOpen( pszLayer, "r+b" ) ); } /************************************************************************/ /* _SHPSetBounds() */ /* */ /* Compute a bounds rectangle for a shape, and set it into the */ /* indicated location in the record. */ /************************************************************************/ static void _SHPSetBounds( uchar * pabyRec, SHPObject * psShape ) { ByteCopy( &(psShape->dfXMin), pabyRec + 0, 8 ); ByteCopy( &(psShape->dfYMin), pabyRec + 8, 8 ); ByteCopy( &(psShape->dfXMax), pabyRec + 16, 8 ); ByteCopy( &(psShape->dfYMax), pabyRec + 24, 8 ); if( bBigEndian ) { SwapWord( 8, pabyRec + 0 ); SwapWord( 8, pabyRec + 8 ); SwapWord( 8, pabyRec + 16 ); SwapWord( 8, pabyRec + 24 ); } } /************************************************************************/ /* SHPComputeExtents() */ /* */ /* Recompute the extents of a shape. Automatically done by */ /* SHPCreateObject(). */ /************************************************************************/ void SHPAPI_CALL SHPComputeExtents( SHPObject * psObject ) { int i; /* -------------------------------------------------------------------- */ /* Build extents for this object. */ /* -------------------------------------------------------------------- */ if( psObject->nVertices > 0 ) { psObject->dfXMin = psObject->dfXMax = psObject->padfX[0]; psObject->dfYMin = psObject->dfYMax = psObject->padfY[0]; psObject->dfZMin = psObject->dfZMax = psObject->padfZ[0]; psObject->dfMMin = psObject->dfMMax = psObject->padfM[0]; } for( i = 0; i < psObject->nVertices; i++ ) { psObject->dfXMin = MIN(psObject->dfXMin, psObject->padfX[i]); psObject->dfYMin = MIN(psObject->dfYMin, psObject->padfY[i]); psObject->dfZMin = MIN(psObject->dfZMin, psObject->padfZ[i]); psObject->dfMMin = MIN(psObject->dfMMin, psObject->padfM[i]); psObject->dfXMax = MAX(psObject->dfXMax, psObject->padfX[i]); psObject->dfYMax = MAX(psObject->dfYMax, psObject->padfY[i]); psObject->dfZMax = MAX(psObject->dfZMax, psObject->padfZ[i]); psObject->dfMMax = MAX(psObject->dfMMax, psObject->padfM[i]); } } /************************************************************************/ /* SHPCreateObject() */ /* */ /* Create a shape object. It should be freed with */ /* SHPDestroyObject(). */ /************************************************************************/ SHPObject SHPAPI_CALL1(*) SHPCreateObject( int nSHPType, int nShapeId, int nParts, int * panPartStart, int * panPartType, int nVertices, double * padfX, double * padfY, double * padfZ, double * padfM ) { SHPObject *psObject; int i, bHasM, bHasZ; psObject = (SHPObject *) calloc(1,sizeof(SHPObject)); psObject->nSHPType = nSHPType; psObject->nShapeId = nShapeId; /* -------------------------------------------------------------------- */ /* Establish whether this shape type has M, and Z values. */ /* -------------------------------------------------------------------- */ if( nSHPType == SHPT_ARCM || nSHPType == SHPT_POINTM || nSHPType == SHPT_POLYGONM || nSHPType == SHPT_MULTIPOINTM ) { bHasM = TRUE; bHasZ = FALSE; } else if( nSHPType == SHPT_ARCZ || nSHPType == SHPT_POINTZ || nSHPType == SHPT_POLYGONZ || nSHPType == SHPT_MULTIPOINTZ || nSHPType == SHPT_MULTIPATCH ) { bHasM = TRUE; bHasZ = TRUE; } else { bHasM = FALSE; bHasZ = FALSE; } /* -------------------------------------------------------------------- */ /* Capture parts. Note that part type is optional, and */ /* defaults to ring. */ /* -------------------------------------------------------------------- */ if( nSHPType == SHPT_ARC || nSHPType == SHPT_POLYGON || nSHPType == SHPT_ARCM || nSHPType == SHPT_POLYGONM || nSHPType == SHPT_ARCZ || nSHPType == SHPT_POLYGONZ || nSHPType == SHPT_MULTIPATCH ) { psObject->nParts = MAX(1,nParts); psObject->panPartStart = (int *) malloc(sizeof(int) * psObject->nParts); psObject->panPartType = (int *) malloc(sizeof(int) * psObject->nParts); psObject->panPartStart[0] = 0; psObject->panPartType[0] = SHPP_RING; for( i = 0; i < nParts; i++ ) { psObject->panPartStart[i] = panPartStart[i]; if( panPartType != NULL ) psObject->panPartType[i] = panPartType[i]; else psObject->panPartType[i] = SHPP_RING; } } /* -------------------------------------------------------------------- */ /* Capture vertices. Note that Z and M are optional, but X and */ /* Y are not. */ /* -------------------------------------------------------------------- */ if( nVertices > 0 ) { psObject->padfX = (double *) calloc(sizeof(double),nVertices); psObject->padfY = (double *) calloc(sizeof(double),nVertices); psObject->padfZ = (double *) calloc(sizeof(double),nVertices); psObject->padfM = (double *) calloc(sizeof(double),nVertices); assert( padfX != NULL ); assert( padfY != NULL ); for( i = 0; i < nVertices; i++ ) { psObject->padfX[i] = padfX[i]; psObject->padfY[i] = padfY[i]; if( padfZ != NULL && bHasZ ) psObject->padfZ[i] = padfZ[i]; if( padfM != NULL && bHasM ) psObject->padfM[i] = padfM[i]; } } /* -------------------------------------------------------------------- */ /* Compute the extents. */ /* -------------------------------------------------------------------- */ psObject->nVertices = nVertices; SHPComputeExtents( psObject ); return( psObject ); } /************************************************************************/ /* SHPCreateSimpleObject() */ /* */ /* Create a simple (common) shape object. Destroy with */ /* SHPDestroyObject(). */ /************************************************************************/ SHPObject SHPAPI_CALL1(*) SHPCreateSimpleObject( int nSHPType, int nVertices, double * padfX, double * padfY, double * padfZ ) { return( SHPCreateObject( nSHPType, -1, 0, NULL, NULL, nVertices, padfX, padfY, padfZ, NULL ) ); } /************************************************************************/ /* SHPWriteObject() */ /* */ /* Write out the vertices of a new structure. Note that it is */ /* only possible to write vertices at the end of the file. */ /************************************************************************/ int SHPAPI_CALL SHPWriteObject(SHPHandle psSHP, int nShapeId, SHPObject * psObject ) { int nRecordOffset, i, nRecordSize; uchar *pabyRec; int32 i32; psSHP->bUpdated = TRUE; /* -------------------------------------------------------------------- */ /* Ensure that shape object matches the type of the file it is */ /* being written to. */ /* -------------------------------------------------------------------- */ assert( psObject->nSHPType == psSHP->nShapeType || psObject->nSHPType == SHPT_NULL ); /* -------------------------------------------------------------------- */ /* Ensure that -1 is used for appends. Either blow an */ /* assertion, or if they are disabled, set the shapeid to -1 */ /* for appends. */ /* -------------------------------------------------------------------- */ assert( nShapeId == -1 || (nShapeId >= 0 && nShapeId < psSHP->nRecords) ); if( nShapeId != -1 && nShapeId >= psSHP->nRecords ) nShapeId = -1; /* -------------------------------------------------------------------- */ /* Add the new entity to the in memory index. */ /* -------------------------------------------------------------------- */ if( nShapeId == -1 && psSHP->nRecords+1 > 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 ); } /* -------------------------------------------------------------------- */ /* Initialize record. */ /* -------------------------------------------------------------------- */ pabyRec = (uchar *) malloc(psObject->nVertices * 4 * sizeof(double) + psObject->nParts * 8 + 128); /* -------------------------------------------------------------------- */ /* Extract vertices for a Polygon or Arc. */ /* -------------------------------------------------------------------- */ if( psObject->nSHPType == SHPT_POLYGON || psObject->nSHPType == SHPT_POLYGONZ || psObject->nSHPType == SHPT_POLYGONM || psObject->nSHPType == SHPT_ARC || psObject->nSHPType == SHPT_ARCZ || psObject->nSHPType == SHPT_ARCM || psObject->nSHPType == SHPT_MULTIPATCH ) { int32 nPoints, nParts; int i; nPoints = psObject->nVertices; nParts = psObject->nParts; _SHPSetBounds( pabyRec + 12, psObject ); if( bBigEndian ) SwapWord( 4, &nPoints ); if( bBigEndian ) SwapWord( 4, &nParts ); ByteCopy( &nPoints, pabyRec + 40 + 8, 4 ); ByteCopy( &nParts, pabyRec + 36 + 8, 4 ); nRecordSize = 52; /* * Write part start positions. */ ByteCopy( psObject->panPartStart, pabyRec + 44 + 8, 4 * psObject->nParts ); for( i = 0; i < psObject->nParts; i++ ) { if( bBigEndian ) SwapWord( 4, pabyRec + 44 + 8 + 4*i ); nRecordSize += 4; } /* * Write multipatch part types if needed. */ if( psObject->nSHPType == SHPT_MULTIPATCH ) { memcpy( pabyRec + nRecordSize, psObject->panPartType, 4*psObject->nParts ); for( i = 0; i < psObject->nParts; i++ ) { if( bBigEndian ) SwapWord( 4, pabyRec + nRecordSize ); nRecordSize += 4; } } /* * Write the (x,y) vertex values. */ for( i = 0; i < psObject->nVertices; i++ ) { ByteCopy( psObject->padfX + i, pabyRec + nRecordSize, 8 ); ByteCopy( psObject->padfY + i, pabyRec + nRecordSize + 8, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize + 8 ); nRecordSize += 2 * 8; } /* * Write the Z coordinates (if any). */ if( psObject->nSHPType == SHPT_POLYGONZ || psObject->nSHPType == SHPT_ARCZ || psObject->nSHPType == SHPT_MULTIPATCH ) { ByteCopy( &(psObject->dfZMin), pabyRec + nRecordSize, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); nRecordSize += 8; ByteCopy( &(psObject->dfZMax), pabyRec + nRecordSize, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); nRecordSize += 8; for( i = 0; i < psObject->nVertices; i++ ) { ByteCopy( psObject->padfZ + i, pabyRec + nRecordSize, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); nRecordSize += 8; } } /* * Write the M values, if any. */ if( psObject->nSHPType == SHPT_POLYGONM || psObject->nSHPType == SHPT_ARCM #ifndef DISABLE_MULTIPATCH_MEASURE || psObject->nSHPType == SHPT_MULTIPATCH #endif || psObject->nSHPType == SHPT_POLYGONZ || psObject->nSHPType == SHPT_ARCZ ) { ByteCopy( &(psObject->dfMMin), pabyRec + nRecordSize, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); nRecordSize += 8; ByteCopy( &(psObject->dfMMax), pabyRec + nRecordSize, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); nRecordSize += 8; for( i = 0; i < psObject->nVertices; i++ ) { ByteCopy( psObject->padfM + i, pabyRec + nRecordSize, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); nRecordSize += 8; } } } /* -------------------------------------------------------------------- */ /* Extract vertices for a MultiPoint. */ /* -------------------------------------------------------------------- */ else if( psObject->nSHPType == SHPT_MULTIPOINT || psObject->nSHPType == SHPT_MULTIPOINTZ || psObject->nSHPType == SHPT_MULTIPOINTM ) { int32 nPoints; int i; nPoints = psObject->nVertices; _SHPSetBounds( pabyRec + 12, psObject ); if( bBigEndian ) SwapWord( 4, &nPoints ); ByteCopy( &nPoints, pabyRec + 44, 4 ); for( i = 0; i < psObject->nVertices; i++ ) { ByteCopy( psObject->padfX + i, pabyRec + 48 + i*16, 8 ); ByteCopy( psObject->padfY + i, pabyRec + 48 + i*16 + 8, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + 48 + i*16 ); if( bBigEndian ) SwapWord( 8, pabyRec + 48 + i*16 + 8 ); } nRecordSize = 48 + 16 * psObject->nVertices; if( psObject->nSHPType == SHPT_MULTIPOINTZ ) { ByteCopy( &(psObject->dfZMin), pabyRec + nRecordSize, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); nRecordSize += 8; ByteCopy( &(psObject->dfZMax), pabyRec + nRecordSize, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); nRecordSize += 8; for( i = 0; i < psObject->nVertices; i++ ) { ByteCopy( psObject->padfZ + i, pabyRec + nRecordSize, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); nRecordSize += 8; } } if( psObject->nSHPType == SHPT_MULTIPOINTZ || psObject->nSHPType == SHPT_MULTIPOINTM ) { ByteCopy( &(psObject->dfMMin), pabyRec + nRecordSize, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); nRecordSize += 8; ByteCopy( &(psObject->dfMMax), pabyRec + nRecordSize, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); nRecordSize += 8; for( i = 0; i < psObject->nVertices; i++ ) { ByteCopy( psObject->padfM + i, pabyRec + nRecordSize, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); nRecordSize += 8; } } } /* -------------------------------------------------------------------- */ /* Write point. */ /* -------------------------------------------------------------------- */ else if( psObject->nSHPType == SHPT_POINT || psObject->nSHPType == SHPT_POINTZ || psObject->nSHPType == SHPT_POINTM ) { ByteCopy( psObject->padfX, pabyRec + 12, 8 ); ByteCopy( psObject->padfY, pabyRec + 20, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + 12 ); if( bBigEndian ) SwapWord( 8, pabyRec + 20 ); nRecordSize = 28; if( psObject->nSHPType == SHPT_POINTZ ) { ByteCopy( psObject->padfZ, pabyRec + nRecordSize, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); nRecordSize += 8; } if( psObject->nSHPType == SHPT_POINTZ || psObject->nSHPType == SHPT_POINTM ) { ByteCopy( psObject->padfM, pabyRec + nRecordSize, 8 ); if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize ); nRecordSize += 8; } } /* -------------------------------------------------------------------- */ /* Not much to do for null geometries. */ /* -------------------------------------------------------------------- */ else if( psObject->nSHPType == SHPT_NULL ) { nRecordSize = 12; } else { /* unknown type */ assert( FALSE ); } /* -------------------------------------------------------------------- */ /* Establish where we are going to put this record. If we are */ /* rewriting and existing record, and it will fit, then put it */ /* back where the original came from. Otherwise write at the end. */ /* -------------------------------------------------------------------- */ if( nShapeId == -1 || psSHP->panRecSize[nShapeId] < nRecordSize-8 ) { if( nShapeId == -1 ) nShapeId = psSHP->nRecords++; psSHP->panRecOffset[nShapeId] = nRecordOffset = psSHP->nFileSize; psSHP->panRecSize[nShapeId] = nRecordSize-8; psSHP->nFileSize += nRecordSize; } else { nRecordOffset = psSHP->panRecOffset[nShapeId]; } /* -------------------------------------------------------------------- */ /* Set the shape type, record number, and record size. */ /* -------------------------------------------------------------------- */ i32 = nShapeId+1; /* record # */ if( !bBigEndian ) SwapWord( 4, &i32 ); ByteCopy( &i32, pabyRec, 4 ); i32 = (nRecordSize-8)/2; /* record size */ if( !bBigEndian ) SwapWord( 4, &i32 ); ByteCopy( &i32, pabyRec + 4, 4 ); i32 = psObject->nSHPType; /* shape type */ if( bBigEndian ) SwapWord( 4, &i32 ); ByteCopy( &i32, pabyRec + 8, 4 ); /* -------------------------------------------------------------------- */ /* Write out record. */ /* -------------------------------------------------------------------- */ if( fseek( psSHP->fpSHP, nRecordOffset, 0 ) != 0 || fwrite( pabyRec, nRecordSize, 1, psSHP->fpSHP ) < 1 ) { printf( "Error in fseek() or fwrite().\n" ); free( pabyRec ); return -1; } free( pabyRec ); /* -------------------------------------------------------------------- */ /* Expand file wide bounds based on this shape. */ /* -------------------------------------------------------------------- */ if( psSHP->adBoundsMin[0] == 0.0 && psSHP->adBoundsMax[0] == 0.0 && psSHP->adBoundsMin[1] == 0.0 && psSHP->adBoundsMax[1] == 0.0 && psObject->nSHPType != SHPT_NULL ) { psSHP->adBoundsMin[0] = psSHP->adBoundsMax[0] = psObject->padfX[0]; psSHP->adBoundsMin[1] = psSHP->adBoundsMax[1] = psObject->padfY[0]; psSHP->adBoundsMin[2] = psSHP->adBoundsMax[2] = psObject->padfZ[0]; psSHP->adBoundsMin[3] = psSHP->adBoundsMax[3] = psObject->padfM[0]; } for( i = 0; i < psObject->nVertices; i++ ) { psSHP->adBoundsMin[0] = MIN(psSHP->adBoundsMin[0],psObject->padfX[i]); psSHP->adBoundsMin[1] = MIN(psSHP->adBoundsMin[1],psObject->padfY[i]); psSHP->adBoundsMin[2] = MIN(psSHP->adBoundsMin[2],psObject->padfZ[i]); psSHP->adBoundsMin[3] = MIN(psSHP->adBoundsMin[3],psObject->padfM[i]); psSHP->adBoundsMax[0] = MAX(psSHP->adBoundsMax[0],psObject->padfX[i]); psSHP->adBoundsMax[1] = MAX(psSHP->adBoundsMax[1],psObject->padfY[i]); psSHP->adBoundsMax[2] = MAX(psSHP->adBoundsMax[2],psObject->padfZ[i]); psSHP->adBoundsMax[3] = MAX(psSHP->adBoundsMax[3],psObject->padfM[i]); } return( nShapeId ); } /************************************************************************/ /* SHPReadObject() */ /* */ /* Read the vertices, parts, and other non-attribute information */ /* for one shape. */ /************************************************************************/ SHPObject SHPAPI_CALL1(*) SHPReadObject( SHPHandle psSHP, int hEntity ) { SHPObject *psShape; /* -------------------------------------------------------------------- */ /* Validate the record/entity number. */ /* -------------------------------------------------------------------- */ if( hEntity < 0 || hEntity >= psSHP->nRecords ) return( NULL ); /* -------------------------------------------------------------------- */ /* Ensure our record buffer is large enough. */ /* -------------------------------------------------------------------- */ if( psSHP->panRecSize[hEntity]+8 > psSHP->nBufSize ) { psSHP->nBufSize = psSHP->panRecSize[hEntity]+8; psSHP->pabyRec = (uchar *) SfRealloc(psSHP->pabyRec,psSHP->nBufSize); } /* -------------------------------------------------------------------- */ /* Read the record. */ /* -------------------------------------------------------------------- */ fseek( psSHP->fpSHP, psSHP->panRecOffset[hEntity], 0 ); fread( psSHP->pabyRec, psSHP->panRecSize[hEntity]+8, 1, psSHP->fpSHP ); /* -------------------------------------------------------------------- */ /* Allocate and minimally initialize the object. */ /* -------------------------------------------------------------------- */ psShape = (SHPObject *) calloc(1,sizeof(SHPObject)); psShape->nShapeId = hEntity; memcpy( &psShape->nSHPType, psSHP->pabyRec + 8, 4 ); if( bBigEndian ) SwapWord( 4, &(psShape->nSHPType) ); /* ==================================================================== */ /* Extract vertices for a Polygon or Arc. */ /* ==================================================================== */ if( psShape->nSHPType == SHPT_POLYGON || psShape->nSHPType == SHPT_ARC || psShape->nSHPType == SHPT_POLYGONZ || psShape->nSHPType == SHPT_POLYGONM || psShape->nSHPType == SHPT_ARCZ || psShape->nSHPType == SHPT_ARCM || psShape->nSHPType == SHPT_MULTIPATCH ) { int32 nPoints, nParts; int i, nOffset; /* -------------------------------------------------------------------- */ /* Get the X/Y bounds. */ /* -------------------------------------------------------------------- */ memcpy( &(psShape->dfXMin), psSHP->pabyRec + 8 + 4, 8 ); memcpy( &(psShape->dfYMin), psSHP->pabyRec + 8 + 12, 8 ); memcpy( &(psShape->dfXMax), psSHP->pabyRec + 8 + 20, 8 ); memcpy( &(psShape->dfYMax), psSHP->pabyRec + 8 + 28, 8 ); if( bBigEndian ) SwapWord( 8, &(psShape->dfXMin) ); if( bBigEndian ) SwapWord( 8, &(psShape->dfYMin) ); if( bBigEndian ) SwapWord( 8, &(psShape->dfXMax) ); if( bBigEndian ) SwapWord( 8, &(psShape->dfYMax) ); /* -------------------------------------------------------------------- */ /* Extract part/point count, and build vertex and part arrays */ /* to proper size. */ /* -------------------------------------------------------------------- */ memcpy( &nPoints, psSHP->pabyRec + 40 + 8, 4 ); memcpy( &nParts, psSHP->pabyRec + 36 + 8, 4 ); if( bBigEndian ) SwapWord( 4, &nPoints ); if( bBigEndian ) SwapWord( 4, &nParts ); psShape->nVertices = nPoints; psShape->padfX = (double *) calloc(nPoints,sizeof(double)); psShape->padfY = (double *) calloc(nPoints,sizeof(double)); psShape->padfZ = (double *) calloc(nPoints,sizeof(double)); psShape->padfM = (double *) calloc(nPoints,sizeof(double)); psShape->nParts = nParts; psShape->panPartStart = (int *) calloc(nParts,sizeof(int)); psShape->panPartType = (int *) calloc(nParts,sizeof(int)); for( i = 0; i < nParts; i++ ) psShape->panPartType[i] = SHPP_RING; /* -------------------------------------------------------------------- */ /* Copy out the part array from the record. */ /* -------------------------------------------------------------------- */ memcpy( psShape->panPartStart, psSHP->pabyRec + 44 + 8, 4 * nParts ); for( i = 0; i < nParts; i++ ) { if( bBigEndian ) SwapWord( 4, psShape->panPartStart+i ); } nOffset = 44 + 8 + 4*nParts; /* -------------------------------------------------------------------- */ /* If this is a multipatch, we will also have parts types. */ /* -------------------------------------------------------------------- */ if( psShape->nSHPType == SHPT_MULTIPATCH ) { memcpy( psShape->panPartType, psSHP->pabyRec + nOffset, 4*nParts ); for( i = 0; i < nParts; i++ ) { if( bBigEndian ) SwapWord( 4, psShape->panPartType+i ); } nOffset += 4*nParts; } /* -------------------------------------------------------------------- */ /* Copy out the vertices from the record. */ /* -------------------------------------------------------------------- */ for( i = 0; i < nPoints; i++ ) { memcpy(psShape->padfX + i, psSHP->pabyRec + nOffset + i * 16, 8 ); memcpy(psShape->padfY + i, psSHP->pabyRec + nOffset + i * 16 + 8, 8 ); if( bBigEndian ) SwapWord( 8, psShape->padfX + i ); if( bBigEndian ) SwapWord( 8, psShape->padfY + i ); } nOffset += 16*nPoints; /* -------------------------------------------------------------------- */ /* If we have a Z coordinate, collect that now. */ /* -------------------------------------------------------------------- */ if( psShape->nSHPType == SHPT_POLYGONZ || psShape->nSHPType == SHPT_ARCZ || psShape->nSHPType == SHPT_MULTIPATCH ) { memcpy( &(psShape->dfZMin), psSHP->pabyRec + nOffset, 8 ); memcpy( &(psShape->dfZMax), psSHP->pabyRec + nOffset + 8, 8 ); if( bBigEndian ) SwapWord( 8, &(psShape->dfZMin) ); if( bBigEndian ) SwapWord( 8, &(psShape->dfZMax) ); for( i = 0; i < nPoints; i++ ) { memcpy( psShape->padfZ + i, psSHP->pabyRec + nOffset + 16 + i*8, 8 ); if( bBigEndian ) SwapWord( 8, psShape->padfZ + i ); } nOffset += 16 + 8*nPoints; } /* -------------------------------------------------------------------- */ /* If we have a M measure value, then read it now. We assume */ /* that the measure can be present for any shape if the size is */ /* big enough, but really it will only occur for the Z shapes */ /* (options), and the M shapes. */ /* -------------------------------------------------------------------- */ if( psSHP->panRecSize[hEntity]+8 >= nOffset + 16 + 8*nPoints ) { memcpy( &(psShape->dfMMin), psSHP->pabyRec + nOffset, 8 ); memcpy( &(psShape->dfMMax), psSHP->pabyRec + nOffset + 8, 8 ); if( bBigEndian ) SwapWord( 8, &(psShape->dfMMin) ); if( bBigEndian ) SwapWord( 8, &(psShape->dfMMax) ); for( i = 0; i < nPoints; i++ ) { memcpy( psShape->padfM + i, psSHP->pabyRec + nOffset + 16 + i*8, 8 ); if( bBigEndian ) SwapWord( 8, psShape->padfM + i ); } } } /* ==================================================================== */ /* Extract vertices for a MultiPoint. */ /* ==================================================================== */ else if( psShape->nSHPType == SHPT_MULTIPOINT || psShape->nSHPType == SHPT_MULTIPOINTM || psShape->nSHPType == SHPT_MULTIPOINTZ ) { int32 nPoints; int i, nOffset; memcpy( &nPoints, psSHP->pabyRec + 44, 4 ); if( bBigEndian ) SwapWord( 4, &nPoints ); psShape->nVertices = nPoints; psShape->padfX = (double *) calloc(nPoints,sizeof(double)); psShape->padfY = (double *) calloc(nPoints,sizeof(double)); psShape->padfZ = (double *) calloc(nPoints,sizeof(double)); psShape->padfM = (double *) calloc(nPoints,sizeof(double)); for( i = 0; i < nPoints; i++ ) { memcpy(psShape->padfX+i, psSHP->pabyRec + 48 + 16 * i, 8 ); memcpy(psShape->padfY+i, psSHP->pabyRec + 48 + 16 * i + 8, 8 ); if( bBigEndian ) SwapWord( 8, psShape->padfX + i ); if( bBigEndian ) SwapWord( 8, psShape->padfY + i ); } nOffset = 48 + 16*nPoints; /* -------------------------------------------------------------------- */ /* Get the X/Y bounds. */ /* -------------------------------------------------------------------- */ memcpy( &(psShape->dfXMin), psSHP->pabyRec + 8 + 4, 8 ); memcpy( &(psShape->dfYMin), psSHP->pabyRec + 8 + 12, 8 ); memcpy( &(psShape->dfXMax), psSHP->pabyRec + 8 + 20, 8 ); memcpy( &(psShape->dfYMax), psSHP->pabyRec + 8 + 28, 8 ); if( bBigEndian ) SwapWord( 8, &(psShape->dfXMin) ); if( bBigEndian ) SwapWord( 8, &(psShape->dfYMin) ); if( bBigEndian ) SwapWord( 8, &(psShape->dfXMax) ); if( bBigEndian ) SwapWord( 8, &(psShape->dfYMax) ); /* -------------------------------------------------------------------- */ /* If we have a Z coordinate, collect that now. */ /* -------------------------------------------------------------------- */ if( psShape->nSHPType == SHPT_MULTIPOINTZ ) { memcpy( &(psShape->dfZMin), psSHP->pabyRec + nOffset, 8 ); memcpy( &(psShape->dfZMax), psSHP->pabyRec + nOffset + 8, 8 ); if( bBigEndian ) SwapWord( 8, &(psShape->dfZMin) ); if( bBigEndian ) SwapWord( 8, &(psShape->dfZMax) ); for( i = 0; i < nPoints; i++ ) { memcpy( psShape->padfZ + i, psSHP->pabyRec + nOffset + 16 + i*8, 8 ); if( bBigEndian ) SwapWord( 8, psShape->padfZ + i ); } nOffset += 16 + 8*nPoints; } /* -------------------------------------------------------------------- */ /* If we have a M measure value, then read it now. We assume */ /* that the measure can be present for any shape if the size is */ /* big enough, but really it will only occur for the Z shapes */ /* (options), and the M shapes. */ /* -------------------------------------------------------------------- */ if( psSHP->panRecSize[hEntity]+8 >= nOffset + 16 + 8*nPoints ) { memcpy( &(psShape->dfMMin), psSHP->pabyRec + nOffset, 8 ); memcpy( &(psShape->dfMMax), psSHP->pabyRec + nOffset + 8, 8 ); if( bBigEndian ) SwapWord( 8, &(psShape->dfMMin) ); if( bBigEndian ) SwapWord( 8, &(psShape->dfMMax) ); for( i = 0; i < nPoints; i++ ) { memcpy( psShape->padfM + i, psSHP->pabyRec + nOffset + 16 + i*8, 8 ); if( bBigEndian ) SwapWord( 8, psShape->padfM + i ); } } } /* ==================================================================== */ /* Extract vertices for a point. */ /* ==================================================================== */ else if( psShape->nSHPType == SHPT_POINT || psShape->nSHPType == SHPT_POINTM || psShape->nSHPType == SHPT_POINTZ ) { int nOffset; psShape->nVertices = 1; psShape->padfX = (double *) calloc(1,sizeof(double)); psShape->padfY = (double *) calloc(1,sizeof(double)); psShape->padfZ = (double *) calloc(1,sizeof(double)); psShape->padfM = (double *) calloc(1,sizeof(double)); memcpy( psShape->padfX, psSHP->pabyRec + 12, 8 ); memcpy( psShape->padfY, psSHP->pabyRec + 20, 8 ); if( bBigEndian ) SwapWord( 8, psShape->padfX ); if( bBigEndian ) SwapWord( 8, psShape->padfY ); nOffset = 20 + 8; /* -------------------------------------------------------------------- */ /* If we have a Z coordinate, collect that now. */ /* -------------------------------------------------------------------- */ if( psShape->nSHPType == SHPT_POINTZ ) { memcpy( psShape->padfZ, psSHP->pabyRec + nOffset, 8 ); if( bBigEndian ) SwapWord( 8, psShape->padfZ ); nOffset += 8; } /* -------------------------------------------------------------------- */ /* If we have a M measure value, then read it now. We assume */ /* that the measure can be present for any shape if the size is */ /* big enough, but really it will only occur for the Z shapes */ /* (options), and the M shapes. */ /* -------------------------------------------------------------------- */ if( psSHP->panRecSize[hEntity]+8 >= nOffset + 8 ) { memcpy( psShape->padfM, psSHP->pabyRec + nOffset, 8 ); if( bBigEndian ) SwapWord( 8, psShape->padfM ); } /* -------------------------------------------------------------------- */ /* Since no extents are supplied in the record, we will apply */ /* them from the single vertex. */ /* -------------------------------------------------------------------- */ psShape->dfXMin = psShape->dfXMax = psShape->padfX[0]; psShape->dfYMin = psShape->dfYMax = psShape->padfY[0]; psShape->dfZMin = psShape->dfZMax = psShape->padfZ[0]; psShape->dfMMin = psShape->dfMMax = psShape->padfM[0]; } return( psShape ); } /************************************************************************/ /* SHPTypeName() */ /************************************************************************/ const char SHPAPI_CALL1(*) SHPTypeName( int nSHPType ) { switch( nSHPType ) { case SHPT_NULL: return "NullShape"; case SHPT_POINT: return "Point"; case SHPT_ARC: return "Arc"; case SHPT_POLYGON: return "Polygon"; case SHPT_MULTIPOINT: return "MultiPoint"; case SHPT_POINTZ: return "PointZ"; case SHPT_ARCZ: return "ArcZ"; case SHPT_POLYGONZ: return "PolygonZ"; case SHPT_MULTIPOINTZ: return "MultiPointZ"; case SHPT_POINTM: return "PointM"; case SHPT_ARCM: return "ArcM"; case SHPT_POLYGONM: return "PolygonM"; case SHPT_MULTIPOINTM: return "MultiPointM"; case SHPT_MULTIPATCH: return "MultiPatch"; default: return "UnknownShapeType"; } } /************************************************************************/ /* SHPPartTypeName() */ /************************************************************************/ const char SHPAPI_CALL1(*) SHPPartTypeName( int nPartType ) { switch( nPartType ) { case SHPP_TRISTRIP: return "TriangleStrip"; case SHPP_TRIFAN: return "TriangleFan"; case SHPP_OUTERRING: return "OuterRing"; case SHPP_INNERRING: return "InnerRing"; case SHPP_FIRSTRING: return "FirstRing"; case SHPP_RING: return "Ring"; default: return "UnknownPartType"; } } /************************************************************************/ /* SHPDestroyObject() */ /************************************************************************/ void SHPAPI_CALL SHPDestroyObject( SHPObject * psShape ) { if( psShape == NULL ) return; if( psShape->padfX != NULL ) free( psShape->padfX ); if( psShape->padfY != NULL ) free( psShape->padfY ); if( psShape->padfZ != NULL ) free( psShape->padfZ ); if( psShape->padfM != NULL ) free( psShape->padfM ); if( psShape->panPartStart != NULL ) free( psShape->panPartStart ); if( psShape->panPartType != NULL ) free( psShape->panPartType ); free( psShape ); } /************************************************************************/ /* SHPRewindObject() */ /* */ /* Reset the winding of polygon objects to adhere to the */ /* specification. */ /************************************************************************/ int SHPAPI_CALL SHPRewindObject( SHPHandle hSHP, SHPObject * psObject ) { int iOpRing, bAltered = 0; /* -------------------------------------------------------------------- */ /* Do nothing if this is not a polygon object. */ /* -------------------------------------------------------------------- */ if( psObject->nSHPType != SHPT_POLYGON && psObject->nSHPType != SHPT_POLYGONZ && psObject->nSHPType != SHPT_POLYGONM ) return 0; /* -------------------------------------------------------------------- */ /* Process each of the rings. */ /* -------------------------------------------------------------------- */ for( iOpRing = 0; iOpRing < psObject->nParts; iOpRing++ ) { int bInner, iVert, nVertCount, nVertStart, iCheckRing; double dfSum, dfTestX, dfTestY; /* -------------------------------------------------------------------- */ /* Determine if this ring is an inner ring or an outer ring */ /* relative to all the other rings. For now we assume the */ /* first ring is outer and all others are inner, but eventually */ /* we need to fix this to handle multiple island polygons and */ /* unordered sets of rings. */ /* -------------------------------------------------------------------- */ dfTestX = psObject->padfX[psObject->panPartStart[iOpRing]]; dfTestY = psObject->padfY[psObject->panPartStart[iOpRing]]; bInner = FALSE; for( iCheckRing = 0; iCheckRing < psObject->nParts; iCheckRing++ ) { int iEdge; if( iCheckRing == iOpRing ) continue; nVertStart = psObject->panPartStart[iCheckRing]; if( iCheckRing == psObject->nParts-1 ) nVertCount = psObject->nVertices - psObject->panPartStart[iCheckRing]; else nVertCount = psObject->panPartStart[iCheckRing+1] - psObject->panPartStart[iCheckRing]; for( iEdge = 0; iEdge < nVertCount; iEdge++ ) { int iNext; if( iEdge < nVertCount-1 ) iNext = iEdge+1; else iNext = 0; if( (psObject->padfY[iEdge+nVertStart] < dfTestY && psObject->padfY[iNext+nVertStart] >= dfTestY) || (psObject->padfY[iNext+nVertStart] < dfTestY && psObject->padfY[iEdge+nVertStart] >= dfTestY) ) { if( psObject->padfX[iEdge+nVertStart] + (dfTestY - psObject->padfY[iEdge+nVertStart]) / (psObject->padfY[iNext+nVertStart] - psObject->padfY[iEdge+nVertStart]) * (psObject->padfX[iNext+nVertStart] - psObject->padfX[iEdge+nVertStart]) < dfTestX ) bInner = !bInner; } } } /* -------------------------------------------------------------------- */ /* Determine the current order of this ring so we will know if */ /* it has to be reversed. */ /* -------------------------------------------------------------------- */ nVertStart = psObject->panPartStart[iOpRing]; if( iOpRing == psObject->nParts-1 ) nVertCount = psObject->nVertices - psObject->panPartStart[iOpRing]; else nVertCount = psObject->panPartStart[iOpRing+1] - psObject->panPartStart[iOpRing]; dfSum = 0.0; for( iVert = nVertStart; iVert < nVertStart+nVertCount-1; iVert++ ) { dfSum += psObject->padfX[iVert] * psObject->padfY[iVert+1] - psObject->padfY[iVert] * psObject->padfX[iVert+1]; } dfSum += psObject->padfX[iVert] * psObject->padfY[nVertStart] - psObject->padfY[iVert] * psObject->padfX[nVertStart]; /* -------------------------------------------------------------------- */ /* Reverse if necessary. */ /* -------------------------------------------------------------------- */ if( (dfSum < 0.0 && bInner) || (dfSum > 0.0 && !bInner) ) { int i; bAltered++; for( i = 0; i < nVertCount/2; i++ ) { double dfSaved; /* Swap X */ dfSaved = psObject->padfX[nVertStart+i]; psObject->padfX[nVertStart+i] = psObject->padfX[nVertStart+nVertCount-i-1]; psObject->padfX[nVertStart+nVertCount-i-1] = dfSaved; /* Swap Y */ dfSaved = psObject->padfY[nVertStart+i]; psObject->padfY[nVertStart+i] = psObject->padfY[nVertStart+nVertCount-i-1]; psObject->padfY[nVertStart+nVertCount-i-1] = dfSaved; /* Swap Z */ if( psObject->padfZ ) { dfSaved = psObject->padfZ[nVertStart+i]; psObject->padfZ[nVertStart+i] = psObject->padfZ[nVertStart+nVertCount-i-1]; psObject->padfZ[nVertStart+nVertCount-i-1] = dfSaved; } /* Swap M */ if( psObject->padfM ) { dfSaved = psObject->padfM[nVertStart+i]; psObject->padfM[nVertStart+i] = psObject->padfM[nVertStart+nVertCount-i-1]; psObject->padfM[nVertStart+nVertCount-i-1] = dfSaved; } } } } return bAltered; }