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shpopen.c
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shpopen.c
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/******************************************************************************
* $Id: shpopen.c,v 1.73 2012-01-24 22:33:01 fwarmerdam Exp $
*
* Project: Shapelib
* Purpose: Implementation of core Shapefile read/write functions.
* Author: Frank Warmerdam, [email protected]
*
******************************************************************************
* 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 1.73 2012-01-24 22:33:01 fwarmerdam
* fix memory leak on failure to open .shp (gdal #4410)
*
* Revision 1.72 2011-12-11 22:45:28 fwarmerdam
* fix failure return from SHPOpenLL.
*
* Revision 1.71 2011-09-15 03:33:58 fwarmerdam
* fix missing cast (#2344)
*
* Revision 1.70 2011-07-24 05:59:25 fwarmerdam
* minimize use of CPLError in favor of SAHooks.Error()
*
* Revision 1.69 2011-07-24 03:24:22 fwarmerdam
* fix memory leaks in error cases creating shapefiles (#2061)
*
* Revision 1.68 2010-08-27 23:42:52 fwarmerdam
* add SHPAPI_CALL attribute in code
*
* Revision 1.67 2010-07-01 08:15:48 fwarmerdam
* do not error out on an object with zero vertices
*
* Revision 1.66 2010-07-01 07:58:57 fwarmerdam
* minor cleanup of error handling
*
* Revision 1.65 2010-07-01 07:27:13 fwarmerdam
* white space formatting adjustments
*
* Revision 1.64 2010-01-28 11:34:34 fwarmerdam
* handle the shape file length limits more gracefully (#3236)
*
* Revision 1.63 2010-01-28 04:04:40 fwarmerdam
* improve numerical accuracy of SHPRewind() algs (gdal #3363)
*
* Revision 1.62 2010-01-17 05:34:13 fwarmerdam
* Remove asserts on x/y being null (#2148).
*
* Revision 1.61 2010-01-16 05:07:42 fwarmerdam
* allow 0/nulls in shpcreateobject (#2148)
*
* Revision 1.60 2009-09-17 20:50:02 bram
* on Win32, define snprintf as alias to _snprintf
*
* Revision 1.59 2008-03-14 05:25:31 fwarmerdam
* Correct crash on buggy geometries (gdal #2218)
*
* Revision 1.58 2008/01/08 23:28:26 bram
* on line 2095, use a float instead of a double to avoid a compiler warning
*
* Revision 1.57 2007/12/06 07:00:25 fwarmerdam
* dbfopen now using SAHooks for fileio
*
* Revision 1.56 2007/12/04 20:37:56 fwarmerdam
* preliminary implementation of hooks api for io and errors
*
* Revision 1.55 2007/11/21 22:39:56 fwarmerdam
* close shx file in readonly mode (GDAL #1956)
*
* Revision 1.54 2007/11/15 00:12:47 mloskot
* Backported recent changes from GDAL (Ticket #1415) to Shapelib.
*
* Revision 1.53 2007/11/14 22:31:08 fwarmerdam
* checks after mallocs to detect for corrupted/voluntary broken shapefiles.
* http://trac.osgeo.org/gdal/ticket/1991
*
* Revision 1.52 2007/06/21 15:58:33 fwarmerdam
* fix for SHPRewindObject when rings touch at one vertex (gdal #976)
*
* Revision 1.51 2006/09/04 15:24:01 fwarmerdam
* Fixed up log message for 1.49.
*
* Revision 1.50 2006/09/04 15:21:39 fwarmerdam
* fix of last fix
*
* Revision 1.49 2006/09/04 15:21:00 fwarmerdam
* MLoskot: Added stronger test of Shapefile reading failures, e.g. truncated
* files. The problem was discovered by Tim Sutton and reported here
* https://svn.qgis.org/trac/ticket/200
*
* Revision 1.48 2006/01/26 15:07:32 fwarmerdam
* add bMeasureIsUsed flag from Craig Bruce: Bug 1249
*
* Revision 1.47 2006/01/04 20:07:23 fwarmerdam
* In SHPWriteObject() make sure that the record length is updated
* when rewriting an existing record.
*
* Revision 1.46 2005/02/11 17:17:46 fwarmerdam
* added panPartStart[0] validation
*
* Revision 1.45 2004/09/26 20:09:48 fwarmerdam
* const correctness changes
*
* Revision 1.44 2003/12/29 00:18:39 fwarmerdam
* added error checking for failed IO and optional CPL error reporting
*
* Revision 1.43 2003/12/01 16:20:08 warmerda
* be careful of zero vertex shapes
*
* Revision 1.42 2003/12/01 14:58:27 warmerda
* added degenerate object check in SHPRewindObject()
*
* Revision 1.41 2003/07/08 15:22:43 warmerda
* avoid warning
*
* Revision 1.40 2003/04/21 18:30:37 warmerda
* added header write/update public methods
*
* 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.
*
*/
#include "shapefil.h"
#include <math.h>
#include <limits.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
SHP_CVSID("$Id: shpopen.c,v 1.73 2012-01-24 22:33:01 fwarmerdam Exp $")
typedef unsigned char uchar;
#if UINT_MAX == 65535
typedef unsigned long int32;
#else
typedef unsigned 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) ((a<b) ? a : b)
# define MAX(a,b) ((a>b) ? a : b)
#endif
#if defined(WIN32) || defined(_WIN32)
# ifndef snprintf
# define snprintf _snprintf
# endif
#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. */
/************************************************************************/
void SHPAPI_CALL SHPWriteHeader( SHPHandle psSHP )
{
uchar abyHeader[100];
int i;
int32 i32;
double dValue;
int32 *panSHX;
if (psSHP->fpSHX == NULL)
{
psSHP->sHooks.Error( "SHPWriteHeader failed : SHX file is closed");
return;
}
/* -------------------------------------------------------------------- */
/* 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. */
/* -------------------------------------------------------------------- */
if( psSHP->sHooks.FSeek( psSHP->fpSHP, 0, 0 ) != 0
|| psSHP->sHooks.FWrite( abyHeader, 100, 1, psSHP->fpSHP ) != 1 )
{
psSHP->sHooks.Error( "Failure writing .shp header" );
return;
}
/* -------------------------------------------------------------------- */
/* 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 );
if( psSHP->sHooks.FSeek( psSHP->fpSHX, 0, 0 ) != 0
|| psSHP->sHooks.FWrite( abyHeader, 100, 1, psSHP->fpSHX ) != 1 )
{
psSHP->sHooks.Error( "Failure writing .shx header" );
return;
}
/* -------------------------------------------------------------------- */
/* 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 );
}
if( (int)psSHP->sHooks.FWrite( panSHX, sizeof(int32)*2, psSHP->nRecords, psSHP->fpSHX )
!= psSHP->nRecords )
{
psSHP->sHooks.Error( "Failure writing .shx contents" );
}
free( panSHX );
/* -------------------------------------------------------------------- */
/* Flush to disk. */
/* -------------------------------------------------------------------- */
psSHP->sHooks.FFlush( psSHP->fpSHP );
psSHP->sHooks.FFlush( psSHP->fpSHX );
}
/************************************************************************/
/* SHPOpen() */
/************************************************************************/
SHPHandle SHPAPI_CALL
SHPOpen( const char * pszLayer, const char * pszAccess )
{
SAHooks sHooks;
SASetupDefaultHooks( &sHooks );
return SHPOpenLL( pszLayer, pszAccess, &sHooks );
}
/************************************************************************/
/* SHPOpen() */
/* */
/* Open the .shp and .shx files based on the basename of the */
/* files or either file name. */
/************************************************************************/
SHPHandle SHPAPI_CALL
SHPOpenLL( const char * pszLayer, const char * pszAccess, SAHooks *psHooks )
{
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;
memcpy( &(psSHP->sHooks), psHooks, sizeof(SAHooks) );
/* -------------------------------------------------------------------- */
/* 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 = psSHP->sHooks.FOpen(pszFullname, pszAccess );
if( psSHP->fpSHP == NULL )
{
sprintf( pszFullname, "%s.SHP", pszBasename );
psSHP->fpSHP = psSHP->sHooks.FOpen(pszFullname, pszAccess );
}
if( psSHP->fpSHP == NULL )
{
char *pszMessage = (char *) malloc(strlen(pszBasename)*2+256);
sprintf( pszMessage, "Unable to open %s.shp or %s.SHP.",
pszBasename, pszBasename );
psHooks->Error( pszMessage );
free( pszMessage );
free( psSHP );
free( pszBasename );
free( pszFullname );
return NULL;
}
sprintf( pszFullname, "%s.shx", pszBasename );
psSHP->fpSHX = psSHP->sHooks.FOpen(pszFullname, pszAccess );
if( psSHP->fpSHX == NULL )
{
sprintf( pszFullname, "%s.SHX", pszBasename );
psSHP->fpSHX = psSHP->sHooks.FOpen(pszFullname, pszAccess );
}
if( psSHP->fpSHX == NULL )
{
char *pszMessage = (char *) malloc(strlen(pszBasename)*2+256);
sprintf( pszMessage, "Unable to open %s.shx or %s.SHX.",
pszBasename, pszBasename );
psHooks->Error( pszMessage );
free( pszMessage );
psSHP->sHooks.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);
psSHP->sHooks.FRead( pabyBuf, 100, 1, psSHP->fpSHP );
psSHP->nFileSize = ((unsigned int)pabyBuf[24] * 256 * 256 * 256
+ (unsigned int)pabyBuf[25] * 256 * 256
+ (unsigned int)pabyBuf[26] * 256
+ (unsigned int)pabyBuf[27]) * 2;
/* -------------------------------------------------------------------- */
/* Read SHX file Header info */
/* -------------------------------------------------------------------- */
if( psSHP->sHooks.FRead( pabyBuf, 100, 1, psSHP->fpSHX ) != 1
|| pabyBuf[0] != 0
|| pabyBuf[1] != 0
|| pabyBuf[2] != 0x27
|| (pabyBuf[3] != 0x0a && pabyBuf[3] != 0x0d) )
{
psSHP->sHooks.Error( ".shx file is unreadable, or corrupt." );
psSHP->sHooks.FClose( psSHP->fpSHP );
psSHP->sHooks.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 )
{
char szError[200];
sprintf( szError,
"Record count in .shp header is %d, which seems\n"
"unreasonable. Assuming header is corrupt.",
psSHP->nRecords );
psSHP->sHooks.Error( szError );
psSHP->sHooks.FClose( psSHP->fpSHP );
psSHP->sHooks.FClose( psSHP->fpSHX );
free( psSHP );
free(pabyBuf);
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 = (unsigned int *)
malloc(sizeof(unsigned int) * MAX(1,psSHP->nMaxRecords) );
psSHP->panRecSize = (unsigned int *)
malloc(sizeof(unsigned int) * MAX(1,psSHP->nMaxRecords) );
pabyBuf = (uchar *) malloc(8 * MAX(1,psSHP->nRecords) );
if (psSHP->panRecOffset == NULL ||
psSHP->panRecSize == NULL ||
pabyBuf == NULL)
{
char szError[200];
sprintf(szError,
"Not enough memory to allocate requested memory (nRecords=%d).\n"
"Probably broken SHP file",
psSHP->nRecords );
psSHP->sHooks.Error( szError );
psSHP->sHooks.FClose( psSHP->fpSHP );
psSHP->sHooks.FClose( psSHP->fpSHX );
if (psSHP->panRecOffset) free( psSHP->panRecOffset );
if (psSHP->panRecSize) free( psSHP->panRecSize );
if (pabyBuf) free( pabyBuf );
free( psSHP );
return( NULL );
}
if( (int) psSHP->sHooks.FRead( pabyBuf, 8, psSHP->nRecords, psSHP->fpSHX )
!= psSHP->nRecords )
{
char szError[200];
sprintf( szError,
"Failed to read all values for %d records in .shx file.",
psSHP->nRecords );
psSHP->sHooks.Error( szError );
/* SHX is short or unreadable for some reason. */
psSHP->sHooks.FClose( psSHP->fpSHP );
psSHP->sHooks.FClose( psSHP->fpSHX );
free( psSHP->panRecOffset );
free( psSHP->panRecSize );
free( pabyBuf );
free( psSHP );
return( NULL );
}
/* In read-only mode, we can close the SHX now */
if (strcmp(pszAccess, "rb") == 0)
{
psSHP->sHooks.FClose( psSHP->fpSHX );
psSHP->fpSHX = NULL;
}
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 )
{
if( psSHP == NULL )
return;
/* -------------------------------------------------------------------- */
/* 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 );
if ( psSHP->fpSHX != NULL)
psSHP->sHooks.FClose( psSHP->fpSHX );
psSHP->sHooks.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( psSHP == NULL )
return;
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 )
{
SAHooks sHooks;
SASetupDefaultHooks( &sHooks );
return SHPCreateLL( pszLayer, nShapeType, &sHooks );
}
/************************************************************************/
/* SHPCreate() */
/* */
/* Create a new shape file and return a handle to the open */
/* shape file with read/write access. */
/************************************************************************/
SHPHandle SHPAPI_CALL
SHPCreateLL( const char * pszLayer, int nShapeType, SAHooks *psHooks )
{
char *pszBasename = NULL, *pszFullname = NULL;
int i;
SAFile fpSHP = NULL, fpSHX = NULL;
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 = psHooks->FOpen(pszFullname, "wb" );
if( fpSHP == NULL )
{
psHooks->Error( "Failed to create file .shp file." );
goto error;
}
sprintf( pszFullname, "%s.shx", pszBasename );
fpSHX = psHooks->FOpen(pszFullname, "wb" );
if( fpSHX == NULL )
{
psHooks->Error( "Failed to create file .shx file." );
goto error;
}
free( pszFullname ); pszFullname = NULL;
free( pszBasename ); pszBasename = NULL;
/* -------------------------------------------------------------------- */
/* 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. */
/* -------------------------------------------------------------------- */
if( psHooks->FWrite( abyHeader, 100, 1, fpSHP ) != 1 )
{
psHooks->Error( "Failed to write .shp header." );
goto error;
}
/* -------------------------------------------------------------------- */
/* Prepare, and write .shx file header. */
/* -------------------------------------------------------------------- */
i32 = 50; /* file size */
ByteCopy( &i32, abyHeader+24, 4 );
if( !bBigEndian ) SwapWord( 4, abyHeader+24 );
if( psHooks->FWrite( abyHeader, 100, 1, fpSHX ) != 1 )
{
psHooks->Error( "Failed to write .shx header." );
goto error;
}
/* -------------------------------------------------------------------- */
/* Close the files, and then open them as regular existing files. */
/* -------------------------------------------------------------------- */
psHooks->FClose( fpSHP );
psHooks->FClose( fpSHX );
return( SHPOpenLL( pszLayer, "r+b", psHooks ) );
error:
if (pszFullname) free(pszFullname);
if (pszBasename) free(pszBasename);
if (fpSHP) psHooks->FClose( fpSHP );
if (fpSHX) psHooks->FClose( fpSHX );
return NULL;
}
/************************************************************************/
/* _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 );
}