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[modules/smesh.git] / 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 // *******************************************************************************************************************
51 // ==> This file must be modified when MED version changes:
52 // MED_MAJOR_NUM and MED_MINOR_NUM are defined in an external include from MED prerequisite: med.h
53 // When MED_MAJOR_NUM or MED_MINOR_NUM changes, MED_MAJOR_EXPECTED and MED_MINOR_EXPECTED must be set accordingly
54 // and MED_VERSIONS_APPEND_COMPATIBLE must be updated: The lower compatible versions may change with a new MED version
55 // If the major version of MED change (for instance 4 --> 5) and if MED allows to append meshes in MED-4.x format,
56 // Empty file content for MED-4.x should be provided (EMPTY_FILE_4x) and method CreateEmptyMEDFile should be updated.
57 // *******************************************************************************************************************
58
59 #define MED_MAJOR_EXPECTED 4
60 #define MED_MINOR_EXPECTED 1
61 #if MED_MAJOR_NUM != MED_MAJOR_EXPECTED
62   #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 (MED_MAJOR_EXPECTED, MED_MINOR_EXPECTED)"
63 #endif
64 #if MED_MINOR_NUM != MED_MINOR_EXPECTED
65   #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 above (MED_MAJOR_EXPECTED, MED_MINOR_EXPECTED)"
66 #endif
67 #define MED_VERSIONS_APPEND_COMPATIBLE {41, 40, 32, 33} // --- 10*major + minor (the 3rd digit, release, is not used here,
68                                                         //                       med uses always the latest available)
69                                                         // --- The first in the list should be the default: current version
70 // --- empty med file content for the different MED versions with a different major.
71 //     ==> correct accordingly CreateEmptyMEDFile method below!
72 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74 /* --- bytes hexa representation of MED file built in Python
75 f= open('vide_321.med', 'rb')
76 data=f.read()
77 ba=bytearray(data)
78 a=""
79 for i in ba:
80   a+=hex(i)
81   a+=','
82 print a
83 */
84
85 //! internal use: fileName and version must be checked before call
86 bool CreateEmptyMEDFile(const std::string& fileName, int version)
87 {
88   MESSAGE("create an empty med file of the right version, for append " << version);
89   static const unsigned char empty_32[] = EMPTY_FILE_32;
90   static const unsigned char empty_33[] = EMPTY_FILE_33;
91 #ifdef WIN32
92 #ifdef UNICODE
93   std::wstring aFilename = Kernel_Utils::utf8_decode_s(fileName);
94 #else
95   std::wstring aFilename = fileName;
96 #endif
97   std::ofstream ofs(aFilename, std::ios::binary);
98 #else
99   std::ofstream ofs(fileName);
100 #endif
101   if (version == 32)
102     ofs.write(reinterpret_cast<const char *>(empty_32),sizeof(empty_32));
103   else if (version == 33)
104     ofs.write(reinterpret_cast<const char *>(empty_33),sizeof(empty_33));
105   ofs.flush();
106   ofs.close();
107   return true;
108 }
109 // -------------------------------------------------------------------------------------------------------------------
110
111 namespace MED
112 {
113   bool exists(const std::string& fileName)
114   {
115 #ifdef WIN32
116 #ifdef UNICODE
117     int size_needed = MultiByteToWideChar(CP_UTF8, 0, fileName.c_str(), strlen(fileName.c_str()), NULL, 0);
118     wchar_t* path = new wchar_t[size_needed + 1];
119     MultiByteToWideChar(CP_UTF8, 0, fileName.c_str(), strlen(fileName.c_str()), path, size_needed);
120     path[size_needed] = '\0';
121 #else
122     cosnt char* path = xmlPath.c_str();
123 #endif
124     bool res = (GetFileAttributes(path) != INVALID_FILE_ATTRIBUTES);
125 #ifdef UNICODE
126     delete path;
127 #endif
128     return res;
129 #else
130     return (access(fileName.c_str(), F_OK) == 0);
131 #endif
132   }
133
134   /*!
135    *  Return the list of med versions compatibles for write/append,
136    *  encoded in 10*major+minor (for instance, code for med 3.2.1 is 32)
137    */
138   std::vector<int> GetMEDVersionsAppendCompatible()
139   {
140     int mvok[] = MED_VERSIONS_APPEND_COMPATIBLE;
141     std::vector<int> MEDVersionsOK(mvok, mvok + sizeof(mvok)/sizeof(int));
142     int curVersion = MED_MAJOR_NUM * 10 + MED_MINOR_NUM;
143     if ( MEDVersionsOK[0] != curVersion )
144       MEDVersionsOK.insert( MEDVersionsOK.begin(), curVersion );
145     return MEDVersionsOK;
146   }
147
148   /*!
149    *  \brief: Check read or write(append) Compatibility of a med file
150    *  \param [in] : fileName - the file to read or to append to
151    *  \param [in] : isforAppend - when true, check if the med file version is OK to append a mesh,
152    *                              when false, check if the med file is readable.
153    */
154   bool CheckCompatibility(const std::string& fileName, bool isForAppend)
155   {
156     bool ok = false;
157     std::vector<int> medVersionsOK = GetMEDVersionsAppendCompatible();
158     // check that file is accessible
159     if ( exists(fileName) ) {
160       // check HDF5 && MED compatibility
161       med_bool hdfok, medok;
162       med_err r0 = MEDfileCompatibility(fileName.c_str(), &hdfok, &medok);
163       MESSAGE(r0 << " " << hdfok << " " << medok);
164       if ( r0==0 && hdfok && medok ) {
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           MESSAGE(ret << " " << major << "." << minor << "." << release);
170           if (ret >= 0) {
171             bool isReadOnly = !isForAppend;
172             if (isReadOnly)
173               ok = true;
174             else {
175               int medVersion = 10*major + minor;
176               for (size_t ii=0; ii < medVersionsOK.size(); ii++)
177                 if (medVersionsOK[ii] == medVersion) {
178                   ok =true;
179                   break;
180                 }
181             }
182           }
183         }
184         MEDfileClose(aFid);
185       }
186     }
187     return ok;
188   }
189
190   bool GetMEDVersion(const std::string& fileName, int& major, int& minor, int& release)
191   {
192     bool ok = false;
193     major = minor = release = 0;
194     med_idt aFid = MEDfileOpen(fileName.c_str(), MED_ACC_RDONLY);
195     if (aFid >= 0) {
196       med_int _major, _minor, _release;
197       med_err ret = MEDfileNumVersionRd(aFid, &_major, &_minor, &_release);
198       if (ret == 0) {
199         major = _major;
200         minor = _minor;
201         release = _release;
202         ok = true;
203       }
204       MEDfileClose(aFid);
205     }
206     return ok;
207   }
208
209   std::string GetMEDVersion(const std::string& fileName)
210   {
211     std::string version;
212     int major, minor, release;
213     if (GetMEDVersion(fileName, major, minor, release)) {
214       std::ostringstream os;
215       os << major << "." << minor << "." << release;
216       version = os.str();
217     }
218     return version;
219   }
220
221   PWrapper CrWrapperR(const std::string& fileName)
222   {
223     if (!CheckCompatibility(fileName)) {
224       EXCEPTION(std::runtime_error, "Cannot open file '"<<fileName<<"'.");
225     }
226     return new MED::TWrapper(fileName, false);
227   }
228
229   PWrapper CrWrapperW(const std::string& fileName, int theVersion)
230   {
231     bool isCreated = false;
232     if (!CheckCompatibility(fileName, true))
233     {
234       remove(fileName.c_str());
235       isCreated = true;
236     }
237     int minor = -1;
238     if (isCreated)
239     {
240       med_int wantedMajor = MED_MAJOR_NUM;
241       med_int wantedMinor = MED_MINOR_NUM;
242       if (theVersion > 0)
243       {
244         wantedMajor = theVersion/10;
245         wantedMinor = theVersion%10;
246       }
247       if (wantedMajor == MED_MAJOR_NUM) // the med file will be actually created
248       {
249         if (wantedMinor < MED_MINOR_NUM)
250           minor = wantedMinor;
251       }
252       else                              // an empty existing med file of the right version will be used for append
253       {
254         int medVersionsOK[] = MED_VERSIONS_APPEND_COMPATIBLE;
255         bool isVersionOK = false;
256         for (size_t ii=0; ii < sizeof(medVersionsOK)/sizeof(int); ii++)
257           if (medVersionsOK[ii] == theVersion)
258           {
259             isVersionOK =true;
260             break;
261           }
262         if (isVersionOK)              // copy an empty existing med file of the right version, for append
263           CreateEmptyMEDFile(fileName, theVersion);
264       }
265     }
266     return new MED::TWrapper(fileName, true, minor);
267   }
268 }