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STL_reader.h
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STL_reader.h
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// Copyright (c) 2015 GeometryFactory
//
// This file is part of CGAL (www.cgal.org);
//
// $URL$
// $Id$
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s) : Andreas Fabri,
// Mael Rouxel-Labbé
#ifndef CGAL_IO_STL_STL_READER_H
#define CGAL_IO_STL_STL_READER_H
#include <CGAL/IO/io.h>
#include <CGAL/IO/helpers.h>
#include <boost/cstdint.hpp>
#include <boost/range/value_type.hpp>
#include <cctype>
#include <iostream>
#include <map>
#include <string>
#include <vector>
namespace CGAL {
namespace IO {
namespace internal {
template <class PointRange, class TriangleRange, typename IndexMap>
bool read_ASCII_facet(std::istream& is,
PointRange& points,
TriangleRange& facets,
int& index,
IndexMap& index_map,
const bool verbose = false)
{
typedef typename boost::range_value<PointRange>::type Point;
typedef typename boost::range_value<TriangleRange>::type Triangle;
// Here, we have already read the word 'facet' and are looking to read till 'endfacet'
std::string s;
std::string vertex("vertex"), endfacet("endfacet");
int count = 0;
double x,y,z;
Point p;
Triangle ijk;
CGAL::internal::resize(ijk, 3);
while(is >> s)
{
if(s == endfacet)
{
if(count != 3)
{
if(verbose)
std::cerr << "Error: only triangulated surfaces are supported" << std::endl;
return false;
}
facets.push_back(ijk);
return true;
}
else if(s == vertex)
{
if(count >= 3)
{
if(verbose)
std::cerr << "Error: only triangulated surfaces are supported" << std::endl;
return false;
}
if(!(is >> iformat(x) >> iformat(y) >> iformat(z)))
{
if(verbose)
std::cerr << "Error while reading point coordinates (premature end of file)" << std::endl;
return false;
}
else
{
fill_point(x, y, z, 1 /*w*/, p);
typename std::map<Point, int>::iterator iti = index_map.insert(std::make_pair(p, -1)).first;
if(iti->second == -1)
{
ijk[count] = index;
iti->second = index++;
points.push_back(p);
}
else
{
ijk[count] = iti->second;
}
}
++count;
}
}
if(verbose)
std::cerr << "Error while reading facet (premature end of file)" << std::endl;
return false;
}
template <class PointRange, class TriangleRange>
bool parse_ASCII_STL(std::istream& is,
PointRange& points,
TriangleRange& facets,
const bool verbose = false)
{
typedef typename boost::range_value<PointRange>::type Point;
bool solid_found = false;
if(verbose)
std::cout << "Parsing ASCII file..." << std::endl;
if(!is.good())
return false;
// Here, we have already read the word 'solid'
int index = 0;
std::map<Point, int> index_map;
std::string s, facet("facet"), endsolid("endsolid"), solid("solid");
bool in_solid(false);
while(is >> s)
{
if(s == solid)
{
if(in_solid)
break;
in_solid = true;
}
if(s == facet)
{
if(!read_ASCII_facet(is, points, facets, index, index_map, verbose))
return false;
}
else if(s == endsolid)
{
in_solid = false;
solid_found = true;
}
}
if(in_solid)
{
if(verbose)
std::cerr << "Error while parsing ASCII file" << std::endl;
return false;
}
return solid_found && !in_solid;
}
template <class PointRange, class TriangleRange>
bool parse_binary_STL(std::istream& is,
PointRange& points,
TriangleRange& facets,
const bool verbose = false)
{
typedef typename boost::range_value<PointRange>::type Point;
typedef typename boost::range_value<TriangleRange>::type Triangle;
if(verbose)
std::cout << "Parsing binary file..." << std::endl;
// Start from the beginning again to simplify things
is.clear();
is.seekg(0, std::ios::beg);
if(!is.good())
return false;
// Discard the first 80 chars (unused header)
int pos = 0;
char c;
if(verbose)
std::cout << "header: ";
while(pos < 80)
{
is.read(reinterpret_cast<char*>(&c), sizeof(c));
if(!is.good())
break;
if(verbose)
std::cout << c;
++pos;
}
if(verbose)
std::cout << std::endl;
if(pos != 80)
return true; // empty file
int index = 0;
std::map<Point, int> index_map;
boost::uint32_t N32;
if(!(is.read(reinterpret_cast<char*>(&N32), sizeof(N32))))
{
if(verbose)
std::cerr << "Error while reading number of facets" << std::endl;
return false;
}
unsigned int N = N32;
if(verbose)
std::cout << N << " facets to read" << std::endl;
for(unsigned int i=0; i<N; ++i)
{
float normal[3];
if(!(is.read(reinterpret_cast<char*>(&normal[0]), sizeof(normal[0]))) ||
!(is.read(reinterpret_cast<char*>(&normal[1]), sizeof(normal[1]))) ||
!(is.read(reinterpret_cast<char*>(&normal[2]), sizeof(normal[2]))))
{
if(verbose)
std::cerr << "Error while reading normal coordinates (premature end of file)" << std::endl;
return false;
}
Triangle ijk;
CGAL::internal::resize(ijk, 3);
for(int j=0; j<3; ++j)
{
float x,y,z;
if(!(is.read(reinterpret_cast<char*>(&x), sizeof(x))) ||
!(is.read(reinterpret_cast<char*>(&y), sizeof(y))) ||
!(is.read(reinterpret_cast<char*>(&z), sizeof(z))))
{
if(verbose)
std::cerr << "Error while reading vertex coordinates (premature end of file)" << std::endl;
return false;
}
Point p;
fill_point(x, y, z, 1 /*w*/, p);
typename std::map<Point, int>::iterator iti = index_map.insert(std::make_pair(p, -1)).first;
if(iti->second == -1)
{
ijk[j] = index;
iti->second = index++;
points.push_back(p);
}
else
{
ijk[j] = iti->second;
}
}
facets.push_back(ijk);
// Read so-called attribute byte count and ignore it
char c;
if(!(is.read(reinterpret_cast<char*>(&c), sizeof(c))) ||
!(is.read(reinterpret_cast<char*>(&c), sizeof(c))))
{
if(verbose)
std::cerr << "Error while reading attribute byte count (premature end of file)" << std::endl;
return false;
}
}
return !is.fail();
}
} // namespace internal
} // namespace IO
} // namespace CGAL
#endif // CGAL_IO_STL_STL_READER_H