| 11 | using namespace PyMesh; |
| 12 | |
| 13 | MshLoader::MshLoader(const std::string& filename) { |
| 14 | std::ifstream fin(filename.c_str(), std::ios::in | std::ios::binary); |
| 15 | |
| 16 | if (!fin.is_open()) { |
| 17 | std::stringstream err_msg; |
| 18 | err_msg << "failed to open file \"" << filename << "\""; |
| 19 | throw IOError(err_msg.str()); |
| 20 | } |
| 21 | // Parse header |
| 22 | std::string buf; |
| 23 | double version; |
| 24 | int type; |
| 25 | fin >> buf; |
| 26 | if (buf != "$MeshFormat") { throw INVALID_FORMAT; } |
| 27 | |
| 28 | fin >> version >> type >> m_data_size; |
| 29 | m_binary = (type == 1); |
| 30 | |
| 31 | // Some sanity check. |
| 32 | if (m_data_size != 8) { |
| 33 | std::cerr << "Error: data size must be 8 bytes." << std::endl; |
| 34 | throw NOT_IMPLEMENTED; |
| 35 | } |
| 36 | if (sizeof(int) != 4) { |
| 37 | std::cerr << "Error: code must be compiled with int size 4 bytes." << std::endl; |
| 38 | throw NOT_IMPLEMENTED; |
| 39 | } |
| 40 | |
| 41 | // Read in extra info from binary header. |
| 42 | if (m_binary) { |
| 43 | int one; |
| 44 | IOUtils::eat_white_space(fin); |
| 45 | fin.read(reinterpret_cast<char*>(&one), sizeof(int)); |
| 46 | if (one != 1) { |
| 47 | std::cerr << "Warning: binary msh file " << filename |
| 48 | << " is saved with different endianness than this machine." |
| 49 | << std::endl; |
| 50 | throw NOT_IMPLEMENTED; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | fin >> buf; |
| 55 | if (buf != "$EndMeshFormat") { throw NOT_IMPLEMENTED; } |
| 56 | |
| 57 | while (!fin.eof()) { |
| 58 | buf.clear(); |
| 59 | fin >> buf; |
| 60 | if (buf == "$Nodes") { |
| 61 | parse_nodes(fin); |
| 62 | fin >> buf; |
| 63 | if (buf != "$EndNodes") { throw INVALID_FORMAT; } |
| 64 | } else if (buf == "$Elements") { |
| 65 | parse_elements(fin); |
| 66 | fin >> buf; |
| 67 | if (buf != "$EndElements") { throw INVALID_FORMAT; } |
| 68 | } else if (buf == "$NodeData") { |
| 69 | parse_node_field(fin); |
| 70 | fin >> buf; |