ogr2gmlgeometry.cpp

在linux环境下

/******************************************************************************
 * $Id: ogr2gmlgeometry.cpp,v 1.6 2003/04/17 08:22:06 dron Exp $
 *
 * Project:  GML Translator
 * Purpose:  Code to translate OGRGeometry to GML string representation.
 * Author:   Frank Warmerdam, [e-mail]
 *
 ******************************************************************************
 * Copyright (c) 2002, Frank Warmerdam <[e-mail]>
 *
 * 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.
 *****************************************************************************
 *
 * Independent Security Audit 2003/04/17 Andrey Kiselev:
 *   Completed audit of this module. All functions may be used without buffer
 *   overflows and stack corruptions if caller could be trusted.
 *
 * Security Audit 2003/03/28 warmerda:
 *   Completed security audit.  I believe that this module may be safely used 
 *   to generate GML from arbitrary but well formed OGRGeomety objects that
 *   come from a potentially hostile source, but through a trusted OGR importer
 *   without compromising the system.
 *
 * $Log: ogr2gmlgeometry.cpp,v $
 * Revision 1.6  2003/04/17 08:22:06  dron
 * Completed secutity audit, fix in MakeGMLCoordinate().
 *
 * Revision 1.5  2003/03/28 06:00:14  warmerda
 * Completed security audit.  Fixed issue with very large coordinate values
 * potentially causing a buffer overrun.
 *
 * Revision 1.4  2003/03/18 17:13:03  warmerda
 * Improve precision (and use %g) for latlong coordinates.
 *
 * Revision 1.3  2003/03/12 20:52:07  warmerda
 * implemented support for gml:Box
 *
 * Revision 1.2  2003/03/07 21:30:15  warmerda
 * expand tabs
 *
 * Revision 1.1  2003/03/06 20:28:38  warmerda
 * Migrated to here (gdal/ogr) from gdal/ogr/ogrsf_frmts/gml.
 * Changed to implement the C API entry points (OGR_G_*).
 * Added API to take/return CPLXMLNode's directly.
 *
 * Revision 1.5  2002/03/11 22:34:08  warmerda
 * Avoid multiple defining iMember.
 *
 * Revision 1.4  2002/03/11 17:29:04  warmerda
 * added multipolygon support
 *
 * Revision 1.3  2002/03/07 22:38:04  warmerda
 * use ogr_gml_geom.h
 *
 * Revision 1.2  2002/01/25 21:00:31  warmerda
 * fix some small bugs found by MS VC++
 *
 * Revision 1.1  2002/01/25 20:37:02  warmerda
 * New
 */

#include "cpl_minixml.h"
#include "ogr_geometry.h"
#include "ogr_api.h"
#include "cpl_error.h"
#include "cpl_conv.h"

/************************************************************************/
/*                        MakeGMLCoordinate()                           */
/************************************************************************/

static void MakeGMLCoordinate( char *pszTarget, 
                               double x, double y, double z, int b3D )

{
    if( !b3D )
    {
        if( x == (int) x && y == (int) y )
            sprintf( pszTarget, "%d,%d", (int) x, (int) y );
        else if( fabs(x) < 370 && fabs(y) < 370 )
            sprintf( pszTarget, "%.16g,%.16g", x, y );
        else if( fabs(x) > 100000000.0 || fabs(y) > 100000000.0 )
            sprintf( pszTarget, "%.16g,%.16g", x, y );
        else
            sprintf( pszTarget, "%.3f,%.3f", x, y );
    }
    else
    {
        if( x == (int) x && y == (int) y && z == (int) z )
            sprintf( pszTarget, "%d,%d,%d", (int) x, (int) y, (int) z );
        else if( fabs(x) < 370 && fabs(y) < 370 )
            sprintf( pszTarget, "%.16g,%.16g,%.16g", x, y, z );
        else if( fabs(x) > 100000000.0 || fabs(y) > 100000000.0 
                 || fabs(z) > 100000000.0 )
            sprintf( pszTarget, "%.16g,%.16g,%.16g", x, y, z );
        else
            sprintf( pszTarget, "%.3f,%.3f,%.3f", x, y, z );
    }
}

/************************************************************************/
/*                            _GrowBuffer()                             */
/************************************************************************/

static void _GrowBuffer( int nNeeded, char **ppszText, int *pnMaxLength )

{
    if( nNeeded+1 >= *pnMaxLength )
    {
        *pnMaxLength = MAX(*pnMaxLength * 2,nNeeded+1);
        *ppszText = (char *) CPLRealloc(*ppszText, *pnMaxLength);
    }
}

/************************************************************************/
/*                            AppendString()                            */
/************************************************************************/

static void AppendString( char **ppszText, int *pnLength, int *pnMaxLength,
                          const char *pszTextToAppend )

{
    _GrowBuffer( *pnLength + strlen(pszTextToAppend) + 1, 
                 ppszText, pnMaxLength );

    strcat( *ppszText + *pnLength, pszTextToAppend );
    *pnLength += strlen( *ppszText + *pnLength );
}


/************************************************************************/
/*                        AppendCoordinateList()                        */
/************************************************************************/

static void AppendCoordinateList( OGRLineString *poLine, 
                                  char **ppszText, int *pnLength, 
                                  int *pnMaxLength )

{
    char        szCoordinate[256];
    int         b3D = (poLine->getGeometryType() & 0x8000);

    *pnLength += strlen(*ppszText + *pnLength);
    _GrowBuffer( *pnLength + 20, ppszText, pnMaxLength );

    strcat( *ppszText + *pnLength, "<gml:coordinates>" );
    *pnLength += strlen(*ppszText + *pnLength);

    
    for( int iPoint = 0; iPoint < poLine->getNumPoints(); iPoint++ )
    {
        MakeGMLCoordinate( szCoordinate, 
                           poLine->getX(iPoint),
                           poLine->getY(iPoint),
                           poLine->getZ(iPoint),
                           b3D );
        _GrowBuffer( *pnLength + strlen(szCoordinate)+1, 
                     ppszText, pnMaxLength );

        if( iPoint != 0 )
            strcat( *ppszText + *pnLength, " " );
            
        strcat( *ppszText + *pnLength, szCoordinate );
        *pnLength += strlen(*ppszText + *pnLength);
    }
    
    _GrowBuffer( *pnLength + 20, ppszText, pnMaxLength );
    strcat( *ppszText + *pnLength, "</gml:coordinates>" );
    *pnLength += strlen(*ppszText + *pnLength);
}

/************************************************************************/
/*                       OGR2GMLGeometryAppend()                        */
/************************************************************************/

static int OGR2GMLGeometryAppend( OGRGeometry *poGeometry, 
                                  char **ppszText, int *pnLength, 
                                  int *pnMaxLength )

{
/* -------------------------------------------------------------------- */
/*      2D Point                                                        */
/* -------------------------------------------------------------------- */
    if( poGeometry->getGeometryType() == wkbPoint )
    {
        char    szCoordinate[256];
        OGRPoint *poPoint = (OGRPoint *) poGeometry;

        MakeGMLCoordinate( szCoordinate, 
                           poPoint->getX(), poPoint->getY(), 0.0, FALSE );
                           
        _GrowBuffer( *pnLength + strlen(szCoordinate) + 60, 
                     ppszText, pnMaxLength );

        sprintf( *ppszText + *pnLength, 
                "<gml:Point><gml:coordinates>%s</gml:coordinates></gml:Point>",
                 szCoordinate );

        *pnLength += strlen( *ppszText + *pnLength );
    }
/* -------------------------------------------------------------------- */
/*      3D Point                                                        */
/* -------------------------------------------------------------------- */
    else if( poGeometry->getGeometryType() == wkbPoint25D )
    {
        char    szCoordinate[256];
        OGRPoint *poPoint = (OGRPoint *) poGeometry;