src/MEDWrapper/MED_Factory.cxx

   1 // Copyright (C) 2007-2019  CEA/DEN, EDF R&D, OPEN CASCADE
   2 //
   3 // Copyright (C) 2003-2007  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
   4 // CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
   5 //
   6 // This library is free software; you can redistribute it and/or
   7 // modify it under the terms of the GNU Lesser General Public
   8 // License as published by the Free Software Foundation; either
   9 // version 2.1 of the License, or (at your option) any later version.
  10 //
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 // Lesser General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU Lesser General Public
  17 // License along with this library; if not, write to the Free Software
  18 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19 //
  20 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
  21 //
  22
  23 #include "MED_Factory.hxx"
  24 #include "MED_Utilities.hxx"
  25 #include "MED_Wrapper.hxx"
  26
  27 #include <Basics_Utils.hxx>
  28
  29 #include <stdio.h>
  30 #include <errno.h>
  31 #include <sstream>
  32 #include <fstream>
  33
  34 #include <med.h>
  35 extern "C"
  36 {
  37 #ifndef WIN32
  38   #include <unistd.h>
  39 #endif
  40 }
  41 #include <utilities.h>
  42
  43 #ifdef WIN32
  44 #include <windows.h>
  45 #endif
  46
  47 // -------------------------------------------------------------------------------------------------------------------
  48 // --- MED file compatibility: write using a lower major version implies append on an empty file of the target version
  49
  50 #define MED_MAJOR_EXPECTED 4
  51 #define MED_MINOR_EXPECTED 0
  52 #if MED_MAJOR_NUM != MED_MAJOR_EXPECTED
  53   #error "MED major version does not correspond to the expected version, fix the minor and major compatibility values in CheckCompatibility method (MED_VERSIONS_APPEND_COMPATIBLE) and set the correct expected version"
  54 #endif
  55 #if MED_MINOR_NUM != MED_MINOR_EXPECTED
  56   #error "MED minor version does not correspond to the expected version, fix the minor and major compatibility values in CheckCompatibility method (MED_VERSIONS_APPEND_COMPATIBLE) and set the correct expected version"
  57 #endif
  58 #define MED_VERSIONS_APPEND_COMPATIBLE {40, 32, 33} // --- 10*major + minor (the 3rd digit, release, is not used here,
  59                                                     //                       med uses always the latest available)
  60                                                     // --- The first in the list should be the default: current version
  61 // --- empty med file content for the different MED versions with a different major.
  62 //     ==> correct accordingly CreateEmptyMEDFile method below!
  63 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  65 /* --- bytes hexa representation of MED file built in Python
  66 f= open('vide_321.med', 'rb')
  67 data=f.read()
  68 ba=bytearray(data)
  69 a=""
  70 for i in ba:
  71   a+=hex(i)
  72   a+=','
  73 print a
  74 */
  75
  76 //! internal use: fileName and version must be checked before call
  77 bool CreateEmptyMEDFile(const std::string& fileName, int version)
  78 {
  79   MESSAGE("create an empty med file of the right version, for append " << version);
  80   static const unsigned char empty_32[] = EMPTY_FILE_32;
  81   static const unsigned char empty_33[] = EMPTY_FILE_33;
  82 #ifdef WIN32
  83 #ifdef UNICODE
  84   std::wstring aFilename = Kernel_Utils::utf8_decode_s(fileName);
  85 #else
  86   std::wstring aFilename = fileName;
  87 #endif
  88   std::ofstream ofs(aFilename, std::ios::binary);
  89 #else
  90   std::ofstream ofs(fileName);
  91 #endif
  92   if (version == 32)
  93     ofs.write(reinterpret_cast<const char *>(empty_32),sizeof(empty_32));
  94   else if (version == 33)
  95     ofs.write(reinterpret_cast<const char *>(empty_33),sizeof(empty_33));
  96   ofs.flush();
  97   ofs.close();
  98   return true;
  99 }
 100 // -------------------------------------------------------------------------------------------------------------------
 101
 102 namespace MED
 103 {
 104   bool exists(const std::string& fileName)
 105   {
 106 #ifdef WIN32
 107 #ifdef UNICODE
 108     int size_needed = MultiByteToWideChar(CP_UTF8, 0, fileName.c_str(), strlen(fileName.c_str()), NULL, 0);
 109     wchar_t* path = new wchar_t[size_needed + 1];
 110     MultiByteToWideChar(CP_UTF8, 0, fileName.c_str(), strlen(fileName.c_str()), path, size_needed);
 111     path[size_needed] = '\0';
 112 #else
 113     cosnt char* path = xmlPath.c_str();
 114 #endif
 115     bool res = (GetFileAttributes(path) != INVALID_FILE_ATTRIBUTES);
 116 #ifdef UNICODE
 117     delete path;
 118 #endif
 119     return res;
 120 #else
 121     return (access(fileName.c_str(), F_OK) == 0);
 122 #endif
 123   }
 124
 125   /*!
 126    *  Return the list of med versions compatibles for write/append,
 127    *  encoded in 10*major+minor (for instance, code for med 3.2.1 is 32)
 128    */
 129   std::vector<int> GetMEDVersionsAppendCompatible()
 130   {
 131     int mvok[] = MED_VERSIONS_APPEND_COMPATIBLE;
 132     std::vector<int> MEDVersionsOK(mvok, mvok + sizeof(mvok)/sizeof(int));
 133     return MEDVersionsOK;
 134   }
 135
 136   /*!
 137    *  \brief: Check read or write(append) Compatibility of a med file
 138    *  \param [in] : fileName - the file to read or to append to
 139    *  \param [in] : isforAppend - when true, check if the med file version is OK to append a mesh,
 140    *                              when false, check if the med file is readable.
 141    */
 142   bool CheckCompatibility(const std::string& fileName, bool isForAppend)
 143   {
 144     bool ok = false;
 145     int medVersionsOK[] = MED_VERSIONS_APPEND_COMPATIBLE;
 146     // check that file is accessible
 147     if ( exists(fileName) ) {
 148       // check HDF5 && MED compatibility
 149       med_bool hdfok, medok;
 150       med_err r0 = MEDfileCompatibility(fileName.c_str(), &hdfok, &medok);
 151       MESSAGE(r0 << " " << hdfok << " " << medok);
 152       if ( r0==0 && hdfok && medok ) {
 153         med_idt aFid = MEDfileOpen(fileName.c_str(), MED_ACC_RDONLY);
 154         if (aFid >= 0) {
 155           med_int major, minor, release;
 156           med_err ret = MEDfileNumVersionRd(aFid, &major, &minor, &release);
 157           MESSAGE(ret << " " << major << "." << minor << "." << release);
 158           if (ret >= 0) {
 159             bool isReadOnly = !isForAppend;
 160             if (isReadOnly)
 161               ok = true;
 162             else {
 163               int medVersion = 10*major + minor;
 164               for (size_t ii=0; ii < sizeof(medVersionsOK)/sizeof(int); ii++)
 165                 if (medVersionsOK[ii] == medVersion) {
 166                   ok =true;
 167                   break;
 168                 }
 169             }
 170           }
 171         }
 172         MEDfileClose(aFid);
 173       }
 174     }
 175     return ok;
 176   }
 177
 178   bool GetMEDVersion(const std::string& fileName, int& major, int& minor, int& release)
 179   {
 180     bool ok = false;
 181     major = minor = release = 0;
 182     med_idt aFid = MEDfileOpen(fileName.c_str(), MED_ACC_RDONLY);
 183     if (aFid >= 0) {
 184       med_int _major, _minor, _release;
 185       med_err ret = MEDfileNumVersionRd(aFid, &_major, &_minor, &_release);
 186       if (ret == 0) {
 187         major = _major;
 188         minor = _minor;
 189         release = _release;
 190         ok = true;
 191       }
 192       MEDfileClose(aFid);
 193     }
 194     return ok;
 195   }
 196
 197   std::string GetMEDVersion(const std::string& fileName)
 198   {
 199     std::string version;
 200     int major, minor, release;
 201     if (GetMEDVersion(fileName, major, minor, release)) {
 202       std::ostringstream os;
 203       os << major << "." << minor << "." << release;
 204       version = os.str();
 205     }
 206     return version;
 207   }
 208
 209   PWrapper CrWrapperR(const std::string& fileName)
 210   {
 211     if (!CheckCompatibility(fileName)) {
 212       EXCEPTION(std::runtime_error, "Cannot open file '"<<fileName<<"'.");
 213     }
 214     return new MED::TWrapper(fileName);
 215   }
 216
 217   PWrapper CrWrapperW(const std::string& fileName, int theVersion)
 218   {
 219     bool isCreated = false;
 220     if (!CheckCompatibility(fileName, true))
 221     {
 222       remove(fileName.c_str());
 223       isCreated = true;
 224     }
 225     int minor = -1;
 226     if (isCreated)
 227     {
 228       med_int wantedMajor = MED_MAJOR_NUM;
 229       med_int wantedMinor = MED_MINOR_NUM;
 230       if (theVersion > 0)
 231       {
 232         wantedMajor = theVersion/10;
 233         wantedMinor = theVersion%10;
 234       }
 235       if (wantedMajor == MED_MAJOR_NUM) // the med file will be actually created
 236       {
 237         if (wantedMinor < MED_MINOR_NUM)
 238           minor = wantedMinor;
 239       }
 240       else                              // an empty existing med file of the right version will be used for append
 241       {
 242         int medVersionsOK[] = MED_VERSIONS_APPEND_COMPATIBLE;
 243         bool isVersionOK = false;
 244         for (size_t ii=0; ii < sizeof(medVersionsOK)/sizeof(int); ii++)
 245           if (medVersionsOK[ii] == theVersion)
 246           {
 247             isVersionOK =true;
 248             break;
 249           }
 250         if (isVersionOK)              // copy an empty existing med file of the right version, for append
 251           CreateEmptyMEDFile(fileName, theVersion);
 252       }
 253     }
 254     return new MED::TWrapper(fileName, minor);
 255   }
 256 }