/*!

* \brief High level util for effective file reading and other file operations
 */

src/SMESH/Makefile.am

@@ -54,6 +54,7 @@ salomeinclude_HEADERS = \
 	SMESH_OctreeNode.hxx \
 	SMESH_Comment.hxx \
 	SMESH_ComputeError.hxx \
+	SMESH_File.hxx \
 	SMESH_SMESH.hxx
 
 # Libraries targets
@@ -77,7 +78,8 @@ dist_libSMESHimpl_la_SOURCES = \
 	SMESH_HypoFilter.cxx \
 	SMESH_MesherHelper.cxx \
 	SMESH_Octree.cxx \
-	SMESH_OctreeNode.cxx
+	SMESH_OctreeNode.cxx \
+	SMESH_File.cxx
 
 # additionnal information to compile and link file
 libSMESHimpl_la_CPPFLAGS = \

src/SMESH/SMESH_File.cxx

@@ -0,0 +1,219 @@
+// File      : SMESH_File.cxx
+// Created   : Wed Mar 10 11:23:25 2010
+// Author    : Edward AGAPOV (eap)
+
+
+#include "SMESH_File.hxx"
+#include "utilities.h"
+
+#include <OSD_File.hxx>
+#include <Standard_ProgramError.hxx>
+#include <Standard_ErrorHandler.hxx>
+#include <Standard_Failure.hxx>
+
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#ifdef WIN32
+#include <io.h>
+#else
+#include <sys/mman.h>
+#endif
+
+//================================================================================
+/*!
+ * \brief Creator opening the file for reading by default
+ */
+//================================================================================
+
+SMESH_File::SMESH_File(const std::string& name, bool open)
+  :_name(name), _size(-1), _file(0), _map(0), _pos(0), _end(0)
+{
+  if ( open ) this->open();
+}
+
+//================================================================================
+/*!
+ * \brief Destructor closing the file
+ */
+//================================================================================
+
+SMESH_File::~SMESH_File()
+{
+  close();
+}
+
+//================================================================================
+/*!
+ * \brief Open file for reading. Return true if there is something to read
+ */
+//================================================================================
+
+bool SMESH_File::open()
+{
+  int length = size();
+  if ( !_map && length > 0 )
+  {
+#ifdef WNT
+    _file = CreateFile(_name.data(), GENERIC_READ, FILE_SHARE_READ,
+                       NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+    bool ok = ( _file != INVALID_HANDLE_VALUE );
+#else
+    _file = ::open(_name.data(), O_RDONLY );
+    bool ok = ( _file > 0 );
+#endif
+    if ( ok )
+    {
+#ifdef WNT
+      _mapObj = CreateFileMapping(_file, NULL, PAGE_READONLY, 0, (DWORD)length, NULL);
+      _map = (void*) MapViewOfFile( _mapObj, FILE_MAP_READ, 0, 0, 0 );
+#else
+      _map = ::mmap(0,length,PROT_READ,MAP_PRIVATE,_file,0);
+      if ( _map == MAP_FAILED ) _map = NULL;
+#endif
+      if ( _map != NULL )
+      {
+        _size = length;
+        _pos = (char*) _map;
+        _end = _pos + _size;
+      }
+      else
+      {
+#ifdef WNT
+        CloseHandle(_mapObj);
+        CloseHandle(_file);
+#else
+        ::close(_file);
+#endif
+      }
+    }
+  }
+  return _pos;
+}
+
+//================================================================================
+/*!
+ * \brief Close the file
+ */
+//================================================================================
+
+void SMESH_File::close()
+{
+  if ( _map != NULL )
+  {
+#ifdef WNT
+    UnmapViewOfFile(_map);
+    CloseHandle(_mapObj);
+    CloseHandle(_file);
+#else
+    ::munmap(_map, _size);
+    ::close(_file);
+#endif
+    _map = NULL;
+    _pos = _end = 0;
+    _size = -1;
+  }
+}
+
+//================================================================================
+/*!
+ * \brief Remove the file
+ */
+//================================================================================
+
+bool SMESH_File::remove()
+{
+  close();
+  try {
+    OSD_File( TCollection_AsciiString((char*)_name.data()) ).Remove();
+  }
+  catch ( Standard_ProgramError ) {
+    MESSAGE("Can't remove file: " << _name << " ; file does not exist or permission denied");
+    return false;
+  }
+  return true;
+}
+
+//================================================================================
+/*!
+ * \brief Return file size
+ */
+//================================================================================
+
+int SMESH_File::size() const
+{
+  if ( _size >= 0 ) return _size; // size of open file
+
+  int size = -1;
+  int file = ::open( _name.data(), O_RDONLY );
+  if ( file > 0 )
+  {
+    struct stat status;
+    int err = fstat( file, &status);
+    if ( !err )
+      size = status.st_size;
+    ::close( file );
+  }
+  return size;
+}
+
+//================================================================================
+/*!
+ * \brief Set cursor to the given position
+ */
+//================================================================================
+
+void SMESH_File::setPos(const char* pos)
+{
+  if ( pos > (const char*)_map && pos < _end )
+    _pos = (char*) pos;
+}
+
+//================================================================================
+/*!
+ * \brief Skip till current line end and return the skipped string
+ */
+//================================================================================
+
+std::string SMESH_File::getLine()
+{
+  std::string line;
+  const char* p = _pos;
+  while ( !eof() )
+    if ( *(++_pos) == '\n' )
+      break;
+  line.append( p, _pos );
+  if ( !eof() ) _pos++;
+  return line;
+}
+
+//================================================================================
+/*!
+ * \brief Move cursor to the file beginning
+ */
+//================================================================================
+
+void SMESH_File::rewind()
+{
+  _pos = (char*) _map;
+}
+
+//================================================================================
+/*!
+ * \brief Fill vector by reading out integers from file. Vector size gives number
+ * of integers to read
+ */
+//================================================================================
+
+bool SMESH_File::getInts(std::vector<int>& ints)
+{
+  int i = 0;
+  while ( i < ints.size() )
+  {
+    while ( !isdigit( *_pos ) && !eof()) ++_pos;
+    if ( eof() ) break;
+    if ( _pos[-1] == '-' ) --_pos;
+    ints[ i++ ] = strtol( _pos, (char**)&_pos, 10 );
+  }
+  return ( i == ints.size() );
+}

src/SMESH/SMESH_File.hxx

@@ -0,0 +1,92 @@
+//  Copyright (C) 2007-2008  CEA/DEN, EDF R&D, OPEN CASCADE
+//
+//  Copyright (C) 2003-2007  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
+//  CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2.1 of the License.
+//
+//  This library is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+//  Lesser General Public License for more details.
+//
+//  You should have received a copy of the GNU Lesser General Public
+//  License along with this library; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+//
+//  See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
+//
+// File      : SMESH_File.hxx
+// Created   : Wed Mar 10 10:33:04 2010
+// Author    : Edward AGAPOV (eap)
+
+
+#ifndef __SMESH_File_HXX__
+#define __SMESH_File_HXX__
+
+#include "SMESH_SMESH.hxx"
+
+#include <string>
+#include <vector>
+
+/*!
+ * \brief High level util for effective file reading and other file operations
+ */
+class SMESH_File
+{
+public:
+
+  SMESH_File(const std::string& name, bool open=true);
+
+  ~SMESH_File();
+
+  std::string getName() const { return _name; }
+
+  bool open();
+
+  void close();
+
+  bool remove();
+
+  int size() const;
+
+  // ------------------------
+  // Access to file contents
+  // ------------------------
+
+  operator const char*() const { return _pos; }
+
+  bool operator++() { return ++_pos < _end; }
+
+  void operator +=(int posDelta) { _pos+=posDelta; }
+
+  bool eof() const { return _pos >= _end; }
+
+  const char* getPos() const { return _pos; }
+
+  void setPos(const char* pos);
+
+  std::string getLine();
+
+  void rewind();
+
+  bool getInts(std::vector<int>& ids);
+
+private:
+
+  std::string _name; //!< file name
+  int         _size; //!< file size
+#ifdef WNT
+  HANDLE      _file, _mapObj;
+#else
+  int         _file;
+#endif
+  void*       _map;
+  const char* _pos; //!< current position
+  const char* _end; //!< position after file end
+};
+
+#endif