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/******************************************************************************
*
* Project: Shapelib
* Purpose: Utility to validate and reset the winding order of rings in
* polygon geometries to match the ordering required by spec.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 2002, Frank Warmerdam
*
* SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
******************************************************************************
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "shapefil.h"
int main(int argc, char **argv)
{
/* -------------------------------------------------------------------- */
/* Display a usage message. */
/* -------------------------------------------------------------------- */
if (argc != 3)
{
printf("shprewind in_shp_file out_shp_file\n");
exit(1);
}
/* -------------------------------------------------------------------- */
/* Open the passed shapefile. */
/* -------------------------------------------------------------------- */
SHPHandle hSHP = SHPOpen(argv[1], "rb");
if (hSHP == NULL)
{
printf("Unable to open:%s\n", argv[1]);
exit(1);
}
int nShapeType;
int nEntities;
double adfMinBound[4];
double adfMaxBound[4];
SHPGetInfo(hSHP, &nEntities, &nShapeType, adfMinBound, adfMaxBound);
/* -------------------------------------------------------------------- */
/* Create output shapefile. */
/* -------------------------------------------------------------------- */
SHPHandle hSHPOut = SHPCreate(argv[2], nShapeType);
if (hSHPOut == NULL)
{
SHPClose(hSHP);
printf("Unable to create:%s\n", argv[2]);
exit(1);
}
/* -------------------------------------------------------------------- */
/* Skim over the list of shapes, printing all the vertices. */
/* -------------------------------------------------------------------- */
int nInvalidCount = 0;
for (int i = 0; i < nEntities; i++)
{
SHPObject *psShape = SHPReadObject(hSHP, i);
if (SHPRewindObject(hSHP, psShape))
nInvalidCount++;
SHPWriteObject(hSHPOut, -1, psShape);
SHPDestroyObject(psShape);
}
SHPClose(hSHP);
SHPClose(hSHPOut);
printf("%d objects rewound.\n", nInvalidCount);
exit(0);
}
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