65 lines
1.3 KiB
C++
65 lines
1.3 KiB
C++
|
#include "is_stl.h"
|
||
|
|
#include <string>
|
||
|
|
IGL_INLINE bool igl::is_stl(FILE * stl_file, bool & is_ascii)
|
||
|
|
{
|
||
|
|
|
||
|
|
// solid?
|
||
|
|
// YES NO
|
||
|
|
// / if .stl, definitely binary
|
||
|
|
// /
|
||
|
|
// perfect size?
|
||
|
|
// YES NO
|
||
|
|
//
|
||
|
|
const auto perfect_size = [](FILE * stl_file)->bool
|
||
|
|
{
|
||
|
|
//stl_file = freopen(NULL,"rb",stl_file);
|
||
|
|
// Read 80 header
|
||
|
|
char header[80];
|
||
|
|
if(fread(header,sizeof(char),80,stl_file)!=80)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
// Read number of triangles
|
||
|
|
unsigned int num_tri;
|
||
|
|
if(fread(&num_tri,sizeof(unsigned int),1,stl_file)!=1)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
fseek(stl_file,0,SEEK_END);
|
||
|
|
int file_size = ftell(stl_file);
|
||
|
|
fseek(stl_file,0,SEEK_SET);
|
||
|
|
//stl_file = freopen(NULL,"r",stl_file);
|
||
|
|
return (file_size == 80 + 4 + (4*12 + 2) * num_tri);
|
||
|
|
};
|
||
|
|
// Specifically 80 character header
|
||
|
|
char header[80];
|
||
|
|
char solid[80];
|
||
|
|
is_ascii = true;
|
||
|
|
bool f = true;
|
||
|
|
if(fread(header,1,80,stl_file) != 80)
|
||
|
|
{
|
||
|
|
f = false;
|
||
|
|
goto finish;
|
||
|
|
}
|
||
|
|
|
||
|
|
sscanf(header,"%s",solid);
|
||
|
|
if(std::string("solid") == solid)
|
||
|
|
{
|
||
|
|
f = true;
|
||
|
|
is_ascii = !perfect_size(stl_file);
|
||
|
|
}else
|
||
|
|
{
|
||
|
|
is_ascii = false;
|
||
|
|
f = perfect_size(stl_file);
|
||
|
|
}
|
||
|
|
finish:
|
||
|
|
rewind(stl_file);
|
||
|
|
return f;
|
||
|
|
}
|
||
|
|
|
||
|
|
IGL_INLINE bool igl::is_stl(FILE * stl_file)
|
||
|
|
{
|
||
|
|
bool is_ascii;
|
||
|
|
return is_stl(stl_file,is_ascii);
|
||
|
|
}
|