Line data    Source code

       1             : 
       2             : /* Copyright (c) 2012, Daniel Nachbaur <danielnachbaur@googlemail.com>
       3             :  *
       4             :  * This library is free software; you can redistribute it and/or modify it under
       5             :  * the terms of the GNU Lesser General Public License version 2.1 as published
       6             :  * by the Free Software Foundation.
       7             :  *
       8             :  * This library is distributed in the hope that it will be useful, but WITHOUT
       9             :  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
      10             :  * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
      11             :  * details.
      12             :  *
      13             :  * You should have received a copy of the GNU Lesser General Public License
      14             :  * along with this library; if not, write to the Free Software Foundation, Inc.,
      15             :  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
      16             :  */
      17             : 
      18             : 
      19             : template< typename T >
      20           1 : void DataOStreamArchive::save_array( const boost::serialization::array< T >& a,
      21             :                                      unsigned int )
      22             : {
      23           1 :     _stream << Array< const T >( a.address(), a.count( ));
      24           1 : }
      25             : 
      26             : template< class C, class T, class A >
      27           1 : void DataOStreamArchive::save( const std::basic_string< C, T, A >& s )
      28             : {
      29             :     // implementation only valid for narrow string
      30             :     BOOST_STATIC_ASSERT( sizeof(C) == sizeof(char));
      31           1 :     _stream << s;
      32           1 : }
      33             : 
      34             : template< typename T >
      35             : typename boost::enable_if< boost::is_integral<T> >::type
      36          12 : DataOStreamArchive::save( const T& t )
      37             : {
      38             : #if BOOST_VERSION < 104800
      39             :     namespace bs = boost::detail;
      40             : #else
      41             :     namespace bs = boost::spirit::detail;
      42             : #endif
      43             : 
      44          12 :     if( T temp = t )
      45             :     {
      46             :         // examine the number of bytes
      47             :         // needed to represent the number
      48          11 :         signed char size = 0;
      49           5 :         do
      50             :         {
      51             : #pragma clang diagnostic push
      52             : #pragma clang diagnostic ignored "-Wshift-count-overflow"
      53          16 :             temp >>= CHAR_BIT;
      54             : #pragma clang diagnostic pop
      55          16 :             ++size;
      56             :         }
      57          16 :         while( temp != 0 && temp != (T) -1 );
      58             : 
      59             :         // encode the sign bit into the size
      60          11 :         _saveSignedChar( t > 0 ? size : -size );
      61          10 :         BOOST_ASSERT( t > 0 || boost::is_signed<T>::value) ;
      62             : 
      63             :         // we choose to use little endian because this way we just
      64             :         // save the first size bytes to the stream and skip the rest
      65          11 :         bs::store_little_endian<T, sizeof(T)>( &temp, t );
      66          11 :         save_binary( &temp, size );
      67             :     }
      68             :     else
      69             :         // zero optimization
      70           1 :         _saveSignedChar (0 );
      71          12 : }
      72             : 
      73             : template< typename T >
      74             : typename boost::enable_if< boost::is_floating_point<T> >::type
      75           1 : DataOStreamArchive::save( const T& t )
      76             : {
      77             :     namespace fp = boost::spirit::math;
      78             : 
      79             :     typedef typename fp::detail::fp_traits<T>::type traits;
      80             : 
      81             :     // if the no_infnan flag is set we must throw here
      82           1 :     if( get_flags() & serialization::no_infnan && !fp::isfinite( t ))
      83           0 :         throw DataStreamArchiveException( t );
      84             : 
      85             :     // if you end here there are three possibilities:
      86             :     // 1. you're serializing a long double which is not portable
      87             :     // 2. you're serializing a double but have no 64 bit integer
      88             :     // 3. your machine is using an unknown floating point format
      89             :     // after reading the note above you still might decide to
      90             :     // deactivate this static assert and try if it works out.
      91             :     typename traits::bits bits;
      92             :     BOOST_STATIC_ASSERT( sizeof(bits) == sizeof(T));
      93             :     BOOST_STATIC_ASSERT( std::numeric_limits<T>::is_iec559 );
      94             : 
      95             :     // examine value closely
      96           1 :     switch( fp::fpclassify( t ))
      97             :     {
      98             :     case FP_ZERO:
      99           0 :         bits = 0;
     100           0 :         break;
     101             :     case FP_NAN:
     102           0 :         bits = traits::exponent | traits::mantissa;
     103           0 :         break;
     104             :     case FP_INFINITE:
     105           0 :         bits = traits::exponent | (t<0) * traits::sign;
     106           0 :         break;
     107             :     case FP_SUBNORMAL:
     108             :         assert( std::numeric_limits<T>::has_denorm );
     109             :     case FP_NORMAL:
     110           1 :         traits::get_bits(t, bits);
     111           1 :         break;
     112             :     default:
     113           0 :         throw DataStreamArchiveException( t );
     114             :     }
     115             : 
     116           1 :     save( bits );
     117           1 : }