src/MEDWrapper/MED_Factory.cxx

   1 // Copyright (C) 2007-2016  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         size_t length = strlen(fileName.c_str()) + sizeof(char);
  96         wchar_t* path = new wchar_t[length];
  97         memset(path, '\0', length);
  98         mbstowcs(path, fileName.c_str(), length);
  99 #else
 100         cosnt char* path = xmlPath.c_str();
 101 #endif
 102     return (GetFileAttributes(path) != INVALID_FILE_ATTRIBUTES);
 103 #else
 104     return (access(fileName.c_str(), F_OK) == 0);
 105 #endif
 106   }
 107
 108   /*!
 109    *  Return the list of med versions compatibles for write/append,
 110    *  encoded in 10*major+minor (for instance, code for med 3.2.1 is 32)
 111    */
 112   std::vector<int> GetMEDVersionsAppendCompatible()
 113   {
 114     int mvok[] = MED_VERSIONS_APPEND_COMPATIBLE;
 115     std::vector<int> MEDVersionsOK(mvok, mvok + sizeof(mvok)/sizeof(int));
 116     return MEDVersionsOK;
 117   }
 118
 119   /*!
 120    *  \brief: Check read or write(append) Compatibility of a med file
 121    *  \param [in] : fileName - the file to read or to append to
 122    *  \param [in] : isforAppend - when true, check if the med file version is OK to append a mesh,
 123    *                              when false, check if the med file is readable.
 124    */
 125   bool CheckCompatibility(const std::string& fileName, bool isForAppend)
 126   {
 127     bool ok = false;
 128     int medVersionsOK[] = MED_VERSIONS_APPEND_COMPATIBLE;
 129     // check that file is accessible
 130     if ( exists(fileName) ) {
 131       // check HDF5 && MED compatibility
 132       med_bool hdfok, medok;
 133       med_err r0 = MEDfileCompatibility(fileName.c_str(), &hdfok, &medok);
 134       MESSAGE(r0 << " " << hdfok << " " << medok);
 135       if ( r0==0 && hdfok && medok ) {
 136         med_idt aFid = MEDfileOpen(fileName.c_str(), MED_ACC_RDONLY);
 137         if (aFid >= 0) {
 138           med_int major, minor, release;
 139           med_err ret = MEDfileNumVersionRd(aFid, &major, &minor, &release);
 140           MESSAGE(ret << " " << major << "." << minor << "." << release);
 141           if (ret >= 0) {
 142             bool isReadOnly = !isForAppend;
 143             if (isReadOnly)
 144               ok = true;
 145             else {
 146               int medVersion = 10*major + minor;
 147               for (int ii=0; ii < sizeof(medVersionsOK)/sizeof(int); ii++)
 148                 if (medVersionsOK[ii] == medVersion) {
 149                   ok =true;
 150                   break;
 151                 }
 152             }
 153           }
 154         }
 155         MEDfileClose(aFid);
 156       }
 157     }
 158     return ok;
 159   }
 160
 161   bool GetMEDVersion(const std::string& fileName, int& major, int& minor, int& release)
 162   {
 163     bool ok = false;
 164     major = minor = release = 0;
 165     med_idt aFid = MEDfileOpen(fileName.c_str(), MED_ACC_RDONLY);
 166     if (aFid >= 0) {
 167       med_int _major, _minor, _release;
 168       med_err ret = MEDfileNumVersionRd(aFid, &_major, &_minor, &_release);
 169       if (ret == 0) {
 170         major = _major;
 171         minor = _minor;
 172         release = _release;
 173         ok = true;
 174       }
 175       MEDfileClose(aFid);
 176     }
 177     return ok;
 178   }
 179
 180   std::string GetMEDVersion(const std::string& fileName)
 181   {
 182     std::string version;
 183     int major, minor, release;
 184     if (GetMEDVersion(fileName, major, minor, release)) {
 185       std::ostringstream os;
 186       os << major << "." << minor << "." << release;
 187       version = os.str();
 188     }
 189     return version;
 190   }
 191
 192   PWrapper CrWrapperR(const std::string& fileName)
 193   {
 194     if (!CheckCompatibility(fileName)) {
 195       EXCEPTION(std::runtime_error, "Cannot open file '"<<fileName<<"'.");
 196     }
 197     return new MED::TWrapper(fileName);
 198   }
 199
 200   PWrapper CrWrapperW(const std::string& fileName, int theVersion)
 201   {
 202     bool isCreated = false;
 203     if (!CheckCompatibility(fileName, true))
 204       {
 205         remove(fileName.c_str());
 206         isCreated = true;
 207       }
 208     int minor = -1;
 209     if (isCreated)
 210       {
 211         med_int wantedMajor = MED_MAJOR_NUM;
 212         med_int wantedMinor = MED_MINOR_NUM;
 213         if (theVersion > 0)
 214           {
 215             wantedMajor = theVersion/10;
 216             wantedMinor = theVersion%10;
 217           }
 218         if (wantedMajor == MED_MAJOR_NUM) // the med file will be actually created
 219           {
 220             if (wantedMinor < MED_MINOR_NUM)
 221               minor = wantedMinor;
 222           }
 223         else                              // an empty existing med file of the right version will be used for append
 224           {
 225             int medVersionsOK[] = MED_VERSIONS_APPEND_COMPATIBLE;
 226             bool isVersionOK = false;
 227             for (int ii=0; ii < sizeof(medVersionsOK)/sizeof(int); ii++)
 228               if (medVersionsOK[ii] == theVersion)
 229                 {
 230                   isVersionOK =true;
 231                   break;
 232                 }
 233             if (isVersionOK)              // copy an empty existing med file of the right version, for append
 234               CreateEmptyMEDFile(fileName, theVersion);
 235           }
 236       }
 237     return new MED::TWrapper(fileName, minor);
 238   }
 239 }