byte_order.h

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/*
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 *  Point Cloud Library (PCL) - www.pointclouds.org
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 *  Copyright (c) 2012, Willow Garage, Inc.
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#ifndef PCL_IO_PLY_BYTE_ORDER_H
#define PCL_IO_PLY_BYTE_ORDER_H

#include <boost/detail/endian.hpp>

namespace pcl
{
  namespace io
  {
    namespace ply
    {
      enum byte_order
      {
        little_endian_byte_order,
        big_endian_byte_order,
#if defined(BOOST_BIG_ENDIAN)
        host_byte_order = big_endian_byte_order,
#elif defined(BOOST_LITTLE_ENDIAN)
        host_byte_order = little_endian_byte_order,
#else
#error "unable to determine system endianness"
#endif
        network_byte_order = big_endian_byte_order
      };
      
      template <std::size_t N>
      void swap_byte_order (char* bytes);

      template <>
      inline void swap_byte_order<1> (char*) {}

      template <>
      inline void swap_byte_order<2> (char* bytes)
      {
        std::swap (bytes[0], bytes[1]);
      }

      template <>
        inline void swap_byte_order<4> (char* bytes)
      {
        std::swap (bytes[0], bytes[3]);
        std::swap (bytes[1], bytes[2]);
      }
      
      template <>
        inline void swap_byte_order<8> (char* bytes)
      {
        std::swap (bytes[0], bytes[7]);
        std::swap (bytes[1], bytes[6]);
        std::swap (bytes[2], bytes[5]);
        std::swap (bytes[3], bytes[4]);
      }
      
      template <typename T>
      void swap_byte_order (T& value)
      {
        swap_byte_order<sizeof (T)> (reinterpret_cast<char*> (&value));
      }

    } // namespace ply
  } // namespace io
} // namespace pcl

#endif // PLY_BYTE_ORDER_H