omformat.hh

penMesh is a generic and efficient data structure for representing and manipulating polygonal meshes

  {
    return static_cast<Chunk::Dim>( _hdr.dim_ );
  }

  // calc minimum (power-of-2) number of bits needed
  Chunk::Integer_Size needed_bits( size_t s );


  // Return the storage type (Chunk::Header::bits_)
  template <typename T> 
  inline
  unsigned int bits(const T& val)
  {
    return is_integer(val) 
      ? (static_cast<unsigned int>(integer_size(val)))
      : (static_cast<unsigned int>(float_size(val)));
  }

  // Convert size of type to Integer_Size
  template <typename T> Chunk::Integer_Size integer_size(const T& d)
  {
    assert( is_integer(d) );

    switch( sizeof(T) )
    {
      case  1: return OMFormat::Chunk::Integer_8;
      case  2: return OMFormat::Chunk::Integer_16;
      case  4: return OMFormat::Chunk::Integer_32;
      case  8: return OMFormat::Chunk::Integer_64;
    }
    return Chunk::Integer_Size(0);
  }


  // Convert size of type to FLoat_Size 
  template <typename T> Chunk::Float_Size float_size(const T& d)
  {
    assert( is_float(d) );

    switch( sizeof(T) )
    {
      case  4: return OMFormat::Chunk::Float_32;
      case  8: return OMFormat::Chunk::Float_64;
      case 16: return OMFormat::Chunk::Float_128;
    }
    return Chunk::Float_Size(0);
  }

  // -------------------- create/read version

  inline uint8 mk_version(const uint16 major, const uint16 minor)
  { return (major & 0x07) << 5 | (minor & 0x1f); }


  inline uint16 major_version(const uint8 version) 
  { return (version >> 5) & 0x07; }


  inline uint16 minor_version(const uint8 version) 
  { return (version & 0x001f); }


  // ---------------------------------------- convenience functions

  const char *as_string(Chunk::Type t);
  const char *as_string(Chunk::Entity e);
  const char *as_string(Chunk::Dim d);
  const char *as_string(Chunk::Integer_Size d);
  const char *as_string(Chunk::Float_Size d);

  std::ostream& operator << ( std::ostream& _os, const Header& _h );
  std::ostream& operator << ( std::ostream& _os, const Chunk::Header& _c );

//@}
} // namespace OMFormat

  // -------------------- (re-)store header

  template <> inline
  size_t store( std::ostream& _os, const OMFormat::Header& _hdr, bool _swap)
  { return _hdr.store( _os, _swap ); }

  template <> inline
  size_t restore( std::istream& _is, OMFormat::Header& _hdr, bool _swap )
  { return _hdr.restore( _is, _swap ); }


  // -------------------- (re-)store chunk header

  template <> inline
  size_t 
  store( std::ostream& _os, const OMFormat::Chunk::Header& _hdr, bool _swap)
  {
    OMFormat::uint16 val; val << _hdr;
    return binary<uint16_t>::store( _os, val, _swap );
  }

  template <> inline
  size_t 
  restore( std::istream& _is, OMFormat::Chunk::Header& _hdr, bool _swap )
  {
    OMFormat::uint16 val;
    size_t bytes = binary<uint16_t>::restore( _is, val, _swap );

    _hdr << val;
    
    return bytes;
  }

  // -------------------- (re-)store integer with wanted number of bits (bytes)

  typedef GenProg::True  t_signed;
  typedef GenProg::False t_unsigned;


  // helper to store a an integer
  template< typename T > 
  size_t 
  store( std::ostream& _os, 
	 const T& _val, 
	 OMFormat::Chunk::Integer_Size _b, 
	 bool _swap,
	 t_signed);

  // helper to store a an unsigned integer
  template< typename T > 
  size_t 
  store( std::ostream& _os, 
	 const T& _val, 
	 OMFormat::Chunk::Integer_Size _b, 
	 bool _swap,
	 t_unsigned);

  /// Store an integer with a wanted number of bits
  template< typename T > 
  inline
  size_t 
  store( std::ostream& _os, 
	 const T& _val, 
	 OMFormat::Chunk::Integer_Size _b, 
	 bool _swap)
  {    
    assert( OMFormat::is_integer( _val ) );

    if ( OMFormat::is_signed( _val ) )
      return store( _os, _val, _b, _swap, t_signed()   );
    return   store( _os, _val, _b, _swap, t_unsigned() );
  }



  // helper to store a an integer
  template< typename T > inline
  size_t restore( std::istream& _is, 
		  T& _val, 
		  OMFormat::Chunk::Integer_Size _b, 
		  bool _swap,
		  t_signed);

  // helper to store a an unsigned integer
  template< typename T > inline
  size_t restore( std::istream& _is, 
		  T& _val, 
		  OMFormat::Chunk::Integer_Size _b, 
		  bool _swap,
		  t_unsigned);

  /// Restore an integer with a wanted number of bits
  template< typename T > 
  inline
  size_t 
  restore( std::istream& _is, 
	   T& _val, 
	   OMFormat::Chunk::Integer_Size _b, 
	   bool _swap)
  {    
    assert( OMFormat::is_integer( _val ) );
    
    if ( OMFormat::is_signed( _val ) )
      return restore( _is, _val, _b, _swap, t_signed() );
    return restore( _is, _val, _b, _swap, t_unsigned() );    
  }


  // 
  // ---------------------------------------- storing vectors

  template <typename VecT> inline
  size_t store( std::ostream& _os, const VecT& _vec, GenProg::Int2Type<1>, 
		bool _swap )
  {
    return store( _os, _vec[0], _swap );
  }

  template <typename VecT> inline
  size_t store( std::ostream& _os, const VecT& _vec, GenProg::Int2Type<2>, 
		bool _swap )
  {
    size_t bytes =  store( _os, _vec[0], _swap );
    bytes += store( _os, _vec[1], _swap );
    return bytes;
  }

  template <typename VecT> inline
  size_t store( std::ostream& _os, const VecT& _vec, GenProg::Int2Type<3>, 
		bool _swap )
  {
    size_t bytes =  store( _os, _vec[0], _swap );
    bytes += store( _os, _vec[1], _swap );
    bytes += store( _os, _vec[2], _swap );
    return bytes;
  }

  template <typename VecT> inline
  size_t store( std::ostream& _os, const VecT& _vec, GenProg::Int2Type<4>, 
		bool _swap )
  {
    size_t bytes =  store( _os, _vec[0], _swap );
    bytes += store( _os, _vec[1], _swap );
    bytes += store( _os, _vec[2], _swap );
    bytes += store( _os, _vec[3], _swap );
    return bytes;
  }

  /// storing a vector type
  template <typename VecT> inline
  size_t vector_store( std::ostream& _os, const VecT& _vec, bool _swap )
  {
    return store( _os, _vec, 
		  GenProg::Int2Type< vector_traits<VecT>::size_ >(),
		  _swap );
  }

  // ---------------------------------------- restoring vectors

  template <typename VecT>
  inline 
  size_t
  restore( std::istream& _is, VecT& _vec, GenProg::Int2Type<1>, 
	   bool _swap )
  {
    return restore( _is, _vec[0], _swap );
  }

  template <typename VecT>
  inline
  size_t
  restore( std::istream& _is, VecT& _vec, GenProg::Int2Type<2>, 
	 bool _swap )
  {
    size_t bytes =  restore( _is, _vec[0], _swap );
    bytes += restore( _is, _vec[1], _swap );
    return bytes;
  }

  template <typename VecT>
  inline
  size_t
  restore( std::istream& _is, VecT& _vec, GenProg::Int2Type<3>, 
	 bool _swap )
  {
    typedef typename vector_traits<VecT>::value_type scalar_type;
    size_t bytes;

    bytes  = binary<scalar_type>::restore( _is, _vec[0], _swap );
    bytes += binary<scalar_type>::restore( _is, _vec[1], _swap );
    bytes += binary<scalar_type>::restore( _is, _vec[2], _swap );
    return bytes;
  }

  template <typename VecT>
  inline
  size_t
  restore( std::istream& _is, VecT& _vec, GenProg::Int2Type<4>, 
	   bool _swap )
  {
    typedef typename vector_traits<VecT>::value_type scalar_type;
    size_t bytes;

    bytes  = binary<scalar_type>::restore( _is, _vec[0], _swap );
    bytes += binary<scalar_type>::restore( _is, _vec[1], _swap );
    bytes += binary<scalar_type>::restore( _is, _vec[2], _swap );
    bytes += binary<scalar_type>::restore( _is, _vec[3], _swap );
    return bytes;
  }

  /// Restoring a vector type
  template <typename VecT>
  inline
  size_t
  vector_restore( std::istream& _is, VecT& _vec, bool _swap )
  {
    return restore( _is, _vec, 
		    GenProg::Int2Type< vector_traits<VecT>::size_ >(),
		    _swap );
  }

  // ---------------------------------------- storing property names
  
  template <>
  inline
  size_t store( std::ostream& _os, const OMFormat::Chunk::PropertyName& _pn, 
		bool _swap )
  {
    store( _os, _pn.size(), OMFormat::Chunk::Integer_8, _swap ); // 1 byte
    if ( _pn.size() )
      _os.write( _pn.c_str(), _pn.size() ); // size bytes
    return _pn.size() + 1;
  }

  template <>
  inline
  size_t restore( std::istream& _is, OMFormat::Chunk::PropertyName& _pn, 
		  bool _swap )
  {    
    size_t size;

    restore( _is, size, OMFormat::Chunk::Integer_8, _swap); // 1 byte

    assert( OMFormat::Chunk::PropertyName::is_valid( size ) );

    if ( size > 0 )
    {
      char buf[256];
      _is.read( buf, size ); // size bytes
      buf[size] = '\0';
      _pn.resize(size);
      _pn = buf;
    }
    return size+1;
  }

//=============================================================================
} // namespace IO
} // namespace OpenMesh
#endif
//=============================================================================
#if defined(OM_MISSING_HEADER_LIMITS)
#  undef OM_MISSING_HEADER_LIMITS
#endif
//=============================================================================
#if defined(OM_INCLUDE_TEMPLATES) && !defined(OPENMESH_IO_OMFORMAT_CC)
#  define OPENMESH_IO_OMFORMAT_TEMPLATES
#  include "OMFormat.cc"
#endif
//=============================================================================
#endif
//=============================================================================