Method construct2

plugins/e57/libE57Format/src/ImageFileImpl.cpp:86–182

   }

   void ImageFileImpl::construct2( const ustring &fileName, const ustring &mode )
   {
      // Second phase of construction, now we have a well-formed ImageFile object.

#ifdef E57_VERBOSE
      std::cout << "ImageFileImpl() called, fileName=" << fileName << " mode=" << mode << std::endl;
#endif
      unusedLogicalStart_ = sizeof( E57FileHeader );
      fileName_ = fileName;

      // Get shared_ptr to this object
      ImageFileImplSharedPtr imf = shared_from_this();

      // Accept "w" or "r" modes
      isWriter_ = ( mode == "w" );

      if ( !isWriter_ && ( mode != "r" ) )
      {
         throw E57_EXCEPTION2( ErrorBadAPIArgument, "mode=" + ustring( mode ) );
      }

      file_ = nullptr;

      // Writing
      if ( isWriter_ )
      {
         try
         {
            // Open file for writing, truncate if already exists.
            file_ = new CheckedFile( fileName_, CheckedFile::Write, checksumPolicy );

            std::shared_ptr<StructureNodeImpl> root( new StructureNodeImpl( imf ) );
            root_ = root;
            root_->setAttachedRecursive();

            unusedLogicalStart_ = sizeof( E57FileHeader );
            xmlLogicalOffset_ = 0;
            xmlLogicalLength_ = 0;
         }
         catch ( ... )
         {
            delete file_;
            file_ = nullptr;

            throw;
         }

         return;
      }

      // Reading
      try
      {
         // Open file for reading.
         file_ = new CheckedFile( fileName_, CheckedFile::Read, checksumPolicy );

         std::shared_ptr<StructureNodeImpl> root( new StructureNodeImpl( imf ) );
         root_ = root;