Milena (Olena)
User documentation 2.0a Id
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00001 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 EPITA Research and Development Laboratory (LRDE) 00002 // 00003 // This file is part of Olena. 00004 // 00005 // Olena is free software: you can redistribute it and/or modify it under 00006 // the terms of the GNU General Public License as published by the Free 00007 // Software Foundation, version 2 of the License. 00008 // 00009 // Olena is distributed in the hope that it will be useful, 00010 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00012 // General Public License for more details. 00013 // 00014 // You should have received a copy of the GNU General Public License 00015 // along with Olena. If not, see <http://www.gnu.org/licenses/>. 00016 // 00017 // As a special exception, you may use this file as part of a free 00018 // software project without restriction. Specifically, if other files 00019 // instantiate templates or use macros or inline functions from this 00020 // file, or you compile this file and link it with other files to produce 00021 // an executable, this file does not by itself cause the resulting 00022 // executable to be covered by the GNU General Public License. This 00023 // exception does not however invalidate any other reasons why the 00024 // executable file might be covered by the GNU General Public License. 00025 00026 #ifndef MLN_IO_PNM_LOAD_HEADER_HH 00027 # define MLN_IO_PNM_LOAD_HEADER_HH 00028 00032 00033 # include <cstdlib> 00034 # include <iostream> 00035 # include <fstream> 00036 # include <string> 00037 00038 00039 namespace mln 00040 { 00041 00042 namespace io 00043 { 00044 00045 namespace pnm 00046 { 00047 00048 # ifndef MLN_INCLUDE_ONLY 00049 00050 inline 00051 bool read_header(std::ifstream& istr, 00052 char& type, 00053 int& nrows, int& ncols, 00054 unsigned int& maxval, 00055 bool test = false) 00056 { 00057 // check magic 00058 if (istr.get() != 'P' ) 00059 goto err; 00060 type = static_cast<char>(istr.get()); 00061 00062 if (type < '1' || type > '6') 00063 goto err; 00064 if (istr.get() != '\n') 00065 goto err; 00066 00067 // skip comments 00068 while (istr.peek() == '#') 00069 { 00070 std::string line; 00071 std::getline(istr, line); 00072 } 00073 00074 // get size 00075 istr >> ncols >> nrows; 00076 if (nrows <= 0 || ncols <= 0) 00077 goto err; 00078 00079 // get maxvalue 00080 if (istr.get() != '\n') 00081 goto err; 00082 if (type != '1' && type != '4') 00083 { 00084 istr >> maxval; 00085 if (istr.get() != '\n') 00086 goto err; 00087 } 00088 return true; 00089 00090 err: 00091 if (! test) 00092 { 00093 std::cerr << "error: badly formed header!"; 00094 std::abort(); 00095 } 00096 return false; 00097 } 00098 00099 inline 00100 void read_header(char ascii, char raw, 00101 std::ifstream& istr, 00102 char& type, 00103 int& nrows, int& ncols, 00104 unsigned int& maxval) 00105 { 00106 read_header(istr, type, nrows, ncols, maxval); 00107 if (! (type == ascii || type == raw)) 00108 { 00109 std::cerr << "error: bad pnm type; " 00110 << "expected P" << ascii 00111 << " or P" << raw 00112 << ", get P" << type << "!"; 00113 std::abort(); 00114 } 00115 } 00116 00117 inline 00118 void read_header(char ascii, char raw, 00119 std::ifstream& istr, 00120 char& type, 00121 int& nrows, int& ncols) 00122 { 00123 unsigned int maxval; 00124 read_header(ascii, raw, istr, type, 00125 nrows, ncols, maxval); 00126 } 00127 00128 # endif // ! MLN_INCLUDE_ONLY 00129 00130 } // end of namespace mln::io::pnm 00131 00132 } // end of namespace mln::io 00133 00134 } // end of namespace mln 00135 00136 00137 #endif // ! MLN_IO_PNM_LOAD_HEADER_HH