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 <stdio.h>
  28 #include <errno.h>
  29 #include <sstream>
  30 #include <fstream>
  31
  32 #include <med.h>
  33 extern "C"
  34 {
  35 #ifndef WIN32
  36   #include <unistd.h>
  37 #endif
  38 }
  39 #include <utilities.h>
  40
  41 #ifdef WIN32
  42 #include <windows.h>
  43 #endif
  44
  45 // -------------------------------------------------------------------------------------------------------------------
  46 // --- MED file compatibility: write using a lower major version implies append on an empty file of the target version
  47
  48 #define MED_MAJOR_EXPECTED 4
  49 #define MED_MINOR_EXPECTED 0
  50 #if MED_MAJOR_NUM != MED_MAJOR_EXPECTED
  51   #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"
  52 #endif
  53 #if MED_MINOR_NUM != MED_MINOR_EXPECTED
  54   #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"
  55 #endif
  56 #define MED_VERSIONS_APPEND_COMPATIBLE {40, 32, 33} // --- 10*major + minor (the 3rd digit, release, is not used here,
  57                                                     //                       med uses always the latest available)
  58                                                     // --- The first in the list should be the default: current version
  59 // --- empty med file content for the different MED versions with a different major.
  60 //     ==> correct accordingly CreateEmptyMEDFile method below!
  61 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  63 /* --- bytes hexa representation of MED file built in Python
  64 f= open('vide_321.med', 'rb')
  65 data=f.read()
  66 ba=bytearray(data)
  67 a=""
  68 for i in ba:
  69   a+=hex(i)
  70   a+=','
  71 print a
  72 */
  73
  74 //! internal use: fileName and version must be checked before call
  75 bool CreateEmptyMEDFile(const std::string& fileName, int version)
  76 {
  77   MESSAGE("create an empty med file of the right version, for append " << version);
  78   static const unsigned char empty_32[] = EMPTY_FILE_32;
  79   static const unsigned char empty_33[] = EMPTY_FILE_33;
  80   std::ofstream ofs(fileName);
  81   if (version == 32)
  82     ofs.write(reinterpret_cast<const char *>(empty_32),sizeof(empty_32));
  83   else if (version == 33)
  84     ofs.write(reinterpret_cast<const char *>(empty_33),sizeof(empty_33));
  85   return true;
  86 }
  87 // -------------------------------------------------------------------------------------------------------------------
  88
  89 namespace MED
  90 {
  91   bool exists(const std::string& fileName)
  92   {
  93 #ifdef WIN32
  94 #ifdef UNICODE
  95         int size_needed = MultiByteToWideChar(CP_UTF8, 0, fileName.c_str(), strlen(fileName.c_str()), NULL, 0);
  96         wchar_t* path = new wchar_t[size_needed + 1];
  97         MultiByteToWideChar(CP_UTF8, 0, fileName.c_str(), strlen(fileName.c_str()), path, size_needed);
  98         path[size_needed] = '\0';
  99 #else
 100         cosnt char* path = xmlPath.c_str();
 101 #endif
 102         bool res = (GetFileAttributes(path) != INVALID_FILE_ATTRIBUTES);
 103 #ifdef UNICODE
 104         delete path;
 105 #endif
 106         return res;
 107 #else
 108     return (access(fileName.c_str(), F_OK) == 0);
 109 #endif
 110   }
 111
 112   /*!
 113    *  Return the list of med versions compatibles for write/append,
 114    *  encoded in 10*major+minor (for instance, code for med 3.2.1 is 32)
 115    */
 116   std::vector<int> GetMEDVersionsAppendCompatible()
 117   {
 118     int mvok[] = MED_VERSIONS_APPEND_COMPATIBLE;
 119     std::vector<int> MEDVersionsOK(mvok, mvok + sizeof(mvok)/sizeof(int));
 120     return MEDVersionsOK;
 121   }
 122
 123   /*!
 124    *  \brief: Check read or write(append) Compatibility of a med file
 125    *  \param [in] : fileName - the file to read or to append to
 126    *  \param [in] : isforAppend - when true, check if the med file version is OK to append a mesh,
 127    *                              when false, check if the med file is readable.
 128    */
 129   bool CheckCompatibility(const std::string& fileName, bool isForAppend)
 130   {
 131     bool ok = false;
 132     int medVersionsOK[] = MED_VERSIONS_APPEND_COMPATIBLE;
 133     // check that file is accessible
 134     if ( exists(fileName) ) {
 135       // check HDF5 && MED compatibility
 136       med_bool hdfok, medok;
 137       med_err r0 = MEDfileCompatibility(fileName.c_str(), &hdfok, &medok);
 138       MESSAGE(r0 << " " << hdfok << " " << medok);
 139       if ( r0==0 && hdfok && medok ) {
 140         med_idt aFid = MEDfileOpen(fileName.c_str(), MED_ACC_RDONLY);
 141         if (aFid >= 0) {
 142           med_int major, minor, release;
 143           med_err ret = MEDfileNumVersionRd(aFid, &major, &minor, &release);
 144           MESSAGE(ret << " " << major << "." << minor << "." << release);
 145           if (ret >= 0) {
 146             bool isReadOnly = !isForAppend;
 147             if (isReadOnly)
 148               ok = true;
 149             else {
 150               int medVersion = 10*major + minor;
 151               for (int ii=0; ii < sizeof(medVersionsOK)/sizeof(int); ii++)
 152                 if (medVersionsOK[ii] == medVersion) {
 153                   ok =true;
 154                   break;
 155                 }
 156             }
 157           }
 158         }
 159         MEDfileClose(aFid);
 160       }
 161     }
 162     return ok;
 163   }
 164
 165   bool GetMEDVersion(const std::string& fileName, int& major, int& minor, int& release)
 166   {
 167     bool ok = false;
 168     major = minor = release = 0;
 169     med_idt aFid = MEDfileOpen(fileName.c_str(), MED_ACC_RDONLY);
 170     if (aFid >= 0) {
 171       med_int _major, _minor, _release;
 172       med_err ret = MEDfileNumVersionRd(aFid, &_major, &_minor, &_release);
 173       if (ret == 0) {
 174         major = _major;
 175         minor = _minor;
 176         release = _release;
 177         ok = true;
 178       }
 179       MEDfileClose(aFid);
 180     }
 181     return ok;
 182   }
 183
 184   std::string GetMEDVersion(const std::string& fileName)
 185   {
 186     std::string version;
 187     int major, minor, release;
 188     if (GetMEDVersion(fileName, major, minor, release)) {
 189       std::ostringstream os;
 190       os << major << "." << minor << "." << release;
 191       version = os.str();
 192     }
 193     return version;
 194   }
 195
 196   PWrapper CrWrapperR(const std::string& fileName)
 197   {
 198     if (!CheckCompatibility(fileName)) {
 199       EXCEPTION(std::runtime_error, "Cannot open file '"<<fileName<<"'.");
 200     }
 201     return new MED::TWrapper(fileName);
 202   }
 203
 204   PWrapper CrWrapperW(const std::string& fileName, int theVersion)
 205   {
 206     bool isCreated = false;
 207     if (!CheckCompatibility(fileName, true))
 208       {
 209         remove(fileName.c_str());
 210         isCreated = true;
 211       }
 212     int minor = -1;
 213     if (isCreated)
 214       {
 215         med_int wantedMajor = MED_MAJOR_NUM;
 216         med_int wantedMinor = MED_MINOR_NUM;
 217         if (theVersion > 0)
 218           {
 219             wantedMajor = theVersion/10;
 220             wantedMinor = theVersion%10;
 221           }
 222         if (wantedMajor == MED_MAJOR_NUM) // the med file will be actually created
 223           {
 224             if (wantedMinor < MED_MINOR_NUM)
 225               minor = wantedMinor;
 226           }
 227         else                              // an empty existing med file of the right version will be used for append
 228           {
 229             int medVersionsOK[] = MED_VERSIONS_APPEND_COMPATIBLE;
 230             bool isVersionOK = false;
 231             for (int ii=0; ii < sizeof(medVersionsOK)/sizeof(int); ii++)
 232               if (medVersionsOK[ii] == theVersion)
 233                 {
 234                   isVersionOK =true;
 235                   break;
 236                 }
 237             if (isVersionOK)              // copy an empty existing med file of the right version, for append
 238               CreateEmptyMEDFile(fileName, theVersion);
 239           }
 240       }
 241     return new MED::TWrapper(fileName, minor);
 242   }
 243 }