text: /* ========================================================================= *
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   *                               OpenMesh                                    *
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  //=============================================================================
  //
  //  Implements a reader module for OFF files
  //
  //=============================================================================
  
  
  #ifndef __OMREADER_HH__
  #define __OMREADER_HH__
  
  
  //=== INCLUDES ================================================================
  
  // OpenMesh
  #include <OpenMesh/Core/System/config.h>
  #include <OpenMesh/Core/Utils/SingletonT.hh>
  #include <OpenMesh/Core/IO/OMFormat.hh>
  #include <OpenMesh/Core/IO/IOManager.hh>
  #include <OpenMesh/Core/IO/importer/BaseImporter.hh>
  #include <OpenMesh/Core/IO/reader/BaseReader.hh>
  
  // STD C++
  #include <iosfwd>
  #include <string>
  
  
  //== NAMESPACES ===============================================================
  
  
  namespace OpenMesh {
  namespace IO {
  
  
  //== IMPLEMENTATION ===========================================================
  
  
  /**
      Implementation of the OM format reader. This class is singleton'ed by
      SingletonT to OMReader.
  */
  class OPENMESHDLLEXPORT _OMReader_ : public BaseReader
  {
  public:
  
    _OMReader_();
    virtual ~_OMReader_() { }
  
    std::string get_description() const override { return "OpenMesh File Format"; }
    std::string get_extensions()  const override { return "om"; }
    std::string get_magic()       const override { return "OM"; }
  
    bool read(const std::string& _filename,
  	    BaseImporter& _bi,
  	    Options& _opt ) override;
  
  //!  Stream Reader for std::istream input in binary format
    bool read(std::istream& _is,
  	    BaseImporter& _bi,
  	    Options& _opt ) override;
  
    virtual bool can_u_read(const std::string& _filename) const override;
    virtual bool can_u_read(std::istream& _is) const;
  
  
  private:
  
    bool supports( const OMFormat::uint8 version ) const;
  
    bool read_ascii(std::istream& _is, BaseImporter& _bi, Options& _opt) const;
    bool read_binary(std::istream& _is, BaseImporter& _bi, Options& _opt) const;
  
    typedef OMFormat::Header              Header;
    typedef OMFormat::Chunk::Header       ChunkHeader;
    typedef OMFormat::Chunk::PropertyName PropertyName;
  
    // initialized/updated by read_binary*/read_ascii*
    mutable size_t       bytes_;
    mutable Options      fileOptions_;
    mutable Header       header_;
    mutable ChunkHeader  chunk_header_;
    mutable PropertyName property_name_;
  
    bool read_binary_vertex_chunk(   std::istream      &_is,
  				   BaseImporter      &_bi,
  				   Options           &_opt,
  				   bool              _swap) const;
  
    bool read_binary_face_chunk(     std::istream      &_is,
  			           BaseImporter      &_bi,
  			           Options           &_opt,
  				   bool              _swap) const;
  
    bool read_binary_edge_chunk(     std::istream      &_is,
  			           BaseImporter      &_bi,
  			           Options           &_opt,
  				   bool              _swap) const;
  
    bool read_binary_halfedge_chunk( std::istream      &_is,
  				   BaseImporter      &_bi,
  				   Options           &_opt,
  				   bool              _swap) const;
  
    bool read_binary_mesh_chunk(     std::istream      &_is,
  				   BaseImporter      &_bi,
  				   Options           &_opt,
  				   bool              _swap) const;
  
    size_t restore_binary_custom_data(std::istream& _is,
               BaseProperty* _bp,
               size_t _n_elem,
               bool _swap) const;
  
    //------------------helper
  private:
    void add_generic_property(OMFormat::Chunk::PropertyName& _property_type, BaseImporter& _bi) const;
  };
  
  
  //== TYPE DEFINITION ==========================================================
  
  
  /// Declare the single entity of the OM reader.
  extern _OMReader_  __OMReaderInstance;
  OPENMESHDLLEXPORT _OMReader_&  OMReader();
  
  
  //=============================================================================
  } // namespace IO
  } // namespace OpenMesh
  //=============================================================================
  #endif
  //=============================================================================
  