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#include <boost/foreach.hpp>
#include <boost/regex.hpp>
#include <sstream>
#include <iostream>
#include <fstream>
#include <locale.h>
#include "cgalutils.h"
#include "export.h"
#include "polyset.h"
#include "CGAL_Nef_polyhedron.h"
#include "boosty.h"
#include <CGAL/IO/Nef_polyhedron_iostream_3.h>
using namespace CGALUtils;
#define STL_FACET_NUMBYTES 4*3*4+2
// as there is no 'float32_t' standard, we assume the systems 'float'
// is a 'binary32' aka 'single' standard IEEE 32-bit floating point type
union stl_facet {
uint8_t data8[ STL_FACET_NUMBYTES ];
uint32_t data32[4*3];
struct facet_data {
float i, j, k;
float x1, y1, z1;
float x2, y2, z2;
float x3, y3, z3;
uint16_t attribute_byte_count;
} data;
};
void uint32_byte_swap( uint32_t &x )
{
#if __GNUC__ >= 4 && __GNUC_MINOR__ >= 3
x = __builtin_bswap32( x );
#elif defined(__clang__)
x = __builtin_bswap32( x );
#elif defined(_MSC_VER)
x = _byteswap_ulong( x );
#else
uint32_t b1 = ( 0x000000FF & x ) << 24;
uint32_t b2 = ( 0x0000FF00 & x ) << 8;
uint32_t b3 = ( 0x00FF0000 & x ) >> 8;
uint32_t b4 = ( 0xFF000000 & x ) >> 24;
x = b1 | b2 | b3 | b4;
#endif
}
void read_stl_facet( std::ifstream &f, stl_facet &facet )
{
f.read( (char*)facet.data8, STL_FACET_NUMBYTES );
#ifdef BOOST_BIG_ENDIAN
for ( int i = 0; i < 12; i++ ) {
uint32_byte_swap( facet.data32[ i ] );
}
// we ignore attribute byte count
#endif
}
PolySet *import_stl(const std::string &filename)
{
PolySet *p = new PolySet(3);
// Open file and position at the end
std::ifstream f(filename.c_str(), std::ios::in | std::ios::binary | std::ios::ate);
if (!f.good()) {
PRINTB("WARNING: Can't open import file '%s'.", filename);
return NULL;
}
boost::regex ex_sfe("solid|facet|endloop");
boost::regex ex_outer("outer loop");
boost::regex ex_vertex("vertex");
boost::regex ex_vertices("\\s*vertex\\s+([^\\s]+)\\s+([^\\s]+)\\s+([^\\s]+)");
bool binary = false;
std::streampos file_size = f.tellg();
f.seekg(80);
if (f.good() && !f.eof()) {
uint32_t facenum = 0;
f.read((char *)&facenum, sizeof(uint32_t));
#ifdef BOOST_BIG_ENDIAN
uint32_byte_swap( facenum );
#endif
if (file_size == static_cast<std::streamoff>(80 + 4 + 50*facenum)) {
binary = true;
}
}
f.seekg(0);
char data[5];
f.read(data, 5);
if (!binary && !f.eof() && f.good() && !memcmp(data, "solid", 5)) {
int i = 0;
double vdata[3][3];
std::string line;
std::getline(f, line);
while (!f.eof()) {
std::getline(f, line);
boost::trim(line);
if (boost::regex_search(line, ex_sfe)) {
continue;
}
if (boost::regex_search(line, ex_outer)) {
i = 0;
continue;
}
boost::smatch results;
if (boost::regex_search(line, results, ex_vertices)) {
try {
for (int v=0;v<3;v++) {
vdata[i][v] = boost::lexical_cast<double>(results[v+1]);
}
}
catch (const boost::bad_lexical_cast &blc) {
PRINTB("WARNING: Can't parse vertex line '%s'.", line);
i = 10;
continue;
}
if (++i == 3) {
p->append_poly();
p->append_vertex(vdata[0][0], vdata[0][1], vdata[0][2]);
p->append_vertex(vdata[1][0], vdata[1][1], vdata[1][2]);
p->append_vertex(vdata[2][0], vdata[2][1], vdata[2][2]);
}
}
}
}
else if (binary && !f.eof() && f.good())
{
f.ignore(80-5+4);
while (1) {
stl_facet facet;
read_stl_facet( f, facet );
if (f.eof()) break;
p->append_poly();
p->append_vertex(facet.data.x1, facet.data.y1, facet.data.z1);
p->append_vertex(facet.data.x2, facet.data.y2, facet.data.z2);
p->append_vertex(facet.data.x3, facet.data.y3, facet.data.z3);
}
}
return p;
}
int main(int argc, char *argv[])
{
OpenSCAD::debug = "export_nef";
CGAL_Nef_polyhedron *N = NULL;
PolySet *ps = NULL;
if (argc == 2) {
std::string filename(argv[1]);
std::string suffix = boosty::extension_str(filename);
boost::algorithm::to_lower(suffix);
if (suffix == ".stl") {
if (!(ps = import_stl(filename))) {
std::cerr << "Error importing STL " << argv[1] << std::endl;
exit(1);
}
std::cerr << "Imported " << ps->numPolygons() << " polygons" << std::endl;
}
else if (suffix == ".nef3") {
N = new CGAL_Nef_polyhedron(new CGAL_Nef_polyhedron3);
std::ifstream stream(filename.c_str());
stream >> *N->p3;
std::cerr << "Imported Nef polyhedron" << std::endl;
}
}
else {
std::cerr << "Usage: " << argv[0] << " <file.stl>" << std::endl;
exit(1);
}
if (ps && !N) N = createNefPolyhedronFromGeometry(*ps);
export_stl(N, std::cout);
std::cerr << "Done." << std::endl;
}
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