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* For reading and slight parsing of dxf files
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* Matt Squires <squiresm@colorado.edu>
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* Copyright (C) 2005 Matt Squires
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* Released under GNU GPL and LGPL, read the file 'GPL.txt' and 'LGPL.txt' for details
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int MAX_STR_LN = 10000;
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int section(char* value){
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if ( strncmp(value,"HEADER",6) == 0 ) return 0;
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if ( strncmp(value,"CLASSES",7) == 0 ) return 1;
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if ( strncmp(value,"TABLES",6) == 0 ) return 2;
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if ( strncmp(value,"BLOCKS",6) == 0 ) return 3;
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if ( strncmp(value,"ENTITIES",8) == 0 ) return 4;
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if ( strncmp(value,"OBJECTS",7) == 0 ) return 5;
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if ( strncmp(value,"THUMBNAILIMAGE",14) == 0 ) return 6;
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dxfpair::dxfpair(int gcode, char val[10000]){
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// Dynamically save the strings, otherwise the memory uses is bad
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for (int i = 0; i < strlen(val); i++){
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value.push_back(val[i]);
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char * dxfpair::value_char(char *string){
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int size = value.size();
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while( ( size > 0 ) && int(value[size-1]) < 33){
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// Strip off any control characters and spaces off the end of the string
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for(int i = 0; i < size; i++){
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std::vector< std::vector< dxfpair > > dxf_get_sections(char* filename){
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// In the dxf format information is paired into group codes that indicate the information that follows on the next line. The information on the next line is called the value
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char value[MAX_STR_LN];
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std::vector< std::vector< dxfpair > > out;
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std::vector< dxfpair > header;
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std::vector< dxfpair > classes;
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std::vector< dxfpair > tables;
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std::vector< dxfpair > blocks;
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std::vector< dxfpair > entities;
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std::vector< dxfpair > objects;
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std::vector< dxfpair > thumbnailimage;
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thumbnailimage.clear();
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// Open dxf file for reading
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std::ifstream file(filename);
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exit (1); // Change this to an exception
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// Find the first SECTION header
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while ( (!file.eof()) ){
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// get the first group code and value
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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// TO DO set all the chars to be caps for later comparison
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// Find the SECTION codes
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if ( (group_code == 0 ) && ( strncmp(value,"SECTION",7) == 0 ) ){
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// Directly after a section value is the type of section ( e.g. HEADER, TABLES )
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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section_num = section( value );
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if ( group_code == 2 ){
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// Make sure the the group code is 2 for the SECTION name
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// This is a big block of mostly repetitive code, it will result in larger code, but would be faster than putting the switch in another while loop. If I still live in a time when file size mattered alot I would change it
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//std::cout << "section_num = " << section_num << std::endl;
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switch ( section_num ){
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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header.push_back( dxfpair( group_code, value ) );
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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}while( ( (group_code != 0) || strncmp(value,"ENDSEC",6) != 0 ) && (!file.eof()) ); // I put in the (group_code != 0) in the hope that it will be a faster bool compare than the string compare. Test this later
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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if ( (group_code != 0) || (strncmp(value,"ENDSEC",6) != 0) ){
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// Some dxf files have blank sections. These are not handled by the do/while loop so break about if needed
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classes.push_back( dxfpair( group_code, value ) );
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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}while( ( (group_code != 0) || strncmp(value,"ENDSEC",6) != 0 ) && (!file.eof()) ); // I put in the (group_code != 0) in the hope that it will be a faster bool compare than the string compare. Test this later
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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tables.push_back( dxfpair( group_code, value ) );
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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}while( ( (group_code != 0) || strncmp(value,"ENDSEC",6) != 0 ) && (!file.eof()) );
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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blocks.push_back( dxfpair( group_code, value ) );
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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}while( ( (group_code != 0) || strncmp(value,"ENDSEC",6) != 0 ) && (!file.eof()) ); // I put in the (group_code != 0) in the hope that it will be a faster bool compare than the string compare. Test this later
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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entities.push_back( dxfpair( group_code, value ) );
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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}while( ( (group_code != 0) || strncmp(value,"ENDSEC",6) != 0 ) && (!file.eof()) ); // I put in the (group_code != 0) in the hope that it will be a faster bool compare than the string compare. Test this later
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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objects.push_back( dxfpair( group_code, value ) );
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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}while( ( (group_code != 0) || strncmp(value,"ENDSEC",6) != 0 ) && (!file.eof()) ); // I put in the (group_code != 0) in the hope that it will be a faster bool compare than the string compare. Test this later
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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thumbnailimage.push_back( dxfpair( group_code, value ) );
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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}while( ( (group_code != 0) || strncmp(value,"ENDSEC",6) != 0 ) && (!file.eof()) ); // I put in the (group_code != 0) in the hope that it will be a faster bool compare than the string compare. Test this later
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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file.getline(value,MAX_STR_LN);
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group_code = atoi(value);
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file.getline(value,MAX_STR_LN);
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}while( ( strncmp(value,"EOF",3) != 0 ) && (!file.eof()) );
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out.push_back(header);
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out.push_back(classes);
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out.push_back(tables);
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out.push_back(blocks);
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out.push_back(entities);
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out.push_back(objects);
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out.push_back(thumbnailimage);
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std::vector< std::vector< dxfpair > > separate_parts( std::vector< dxfpair > section){
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//std::cout << "1" << std::endl;
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//std::cout << "section.size() = " << section.size() << std::endl;
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// Find where the major sections are and break into smaller parts
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// Major section is defined as anything beween group_code 0 to 0
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std::vector< dxfpair > inner;
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std::vector< std::vector< dxfpair > > outer;
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//std::cout << "2" << std::endl;
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for (int i = 0; i < section.size(); i++){
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//std::cout << "i = " << i << std::endl;
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//std::cout << "section[i].value.size() = " << section[i].value.size() << std::endl;
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// Make sure no control codes like LF or CR are making it past this section
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if ( (section[i].value.size() > 0) && int(section[i].value.back()) < 32 ){
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section[i].value.pop_back();
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//for(int j = 0;j < section[i].value.size();j++ ) std::cout << section[i].value[j];
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//std::cout << std::endl;
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inner.push_back( section[i] );
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// If the next group code is 0 then push the previously found info on outer and start looking for data again
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if (section[i+1].group_code == 0){
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//std::cout << "inner.push_back" << std::endl;
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outer.push_back( inner );
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// Because putting the data on outer depends on find a GC=0 the last bit of data may be left behind so it inner has data in it put it on outer
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if ( inner.size() > 0 ){
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outer.push_back( inner );
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//std::cout << "3" << std::endl;
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if (section.back().group_code == 0){
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//outer.push_back( inner ); // Put the last part on if there is information, but I don't think it needs to.
added
removed
src/extension/dxf2svg/read_dxf.cpp
