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