/**
*  Copyright (c) 2011 Ubimet
*
*  Distributed under the Boost Software License, Version 1.0. (See accompanying
*  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
**/

#ifndef ENDIAN_HPP
#define ENDIAN_HPP

#include <boost/detail/endian.hpp>
#include <boost/detail/scoped_enum_emulation.hpp>

namespace detail
{
    BOOST_SCOPED_ENUM_START(endianness) { big, little, native };
    BOOST_SCOPED_ENUM_END
}

template<BOOST_SCOPED_ENUM(detail::endianness) e>
struct endian;

template<>
struct endian<detail::endianness::big>
{
    unsigned char *current;
    
    template<typename T>
    endian(T &value)
    {
        current = reinterpret_cast<unsigned char *>(&value);
#if defined(BOOST_LITTLE_ENDIAN)
        current += sizeof(T) - 1;
#endif
    }
    template<typename T>
    endian(const T &value)
    {
        current = const_cast<unsigned char *>(
            reinterpret_cast<const unsigned char *>(&value));
#if defined(BOOST_LITTLE_ENDIAN)
        current += sizeof(T) - 1;
#endif
    }
    void next()
    {
#if defined(BOOST_BIG_ENDIAN)
        ++current;
#elif defined(BOOST_LITTLE_ENDIAN)
        --current;
#endif
    }
};

template<>
struct endian<detail::endianness::little>
{
    unsigned char *current;

    template<typename T>
    endian(T &value)
    {
        current = reinterpret_cast<unsigned char *>(&value);
#if defined(BOOST_BIG_ENDIAN)
        current += sizeof(T) - 1;
#endif
    }
    template<typename T>
    endian(const T &value)
    {
        current = const_cast<unsigned char *>(
            reinterpret_cast<const unsigned char *>(&value));
#if defined(BOOST_BIG_ENDIAN)
        current += sizeof(T) - 1;
#endif
    }
    void next()
    {
#if defined(BOOST_BIG_ENDIAN)
        --current;
#elif defined(BOOST_LITTLE_ENDIAN)
        ++current;
#endif
    }
};

template<>
struct endian<detail::endianness::native>
{
    unsigned char *current;

    template<typename T>
    endian(T &value)
    {
        current = reinterpret_cast<unsigned char *>(&value);
    }
    template<typename T>
    endian(const T &value)
    {
        current = const_cast<unsigned char *>(
            reinterpret_cast<const unsigned char *>(&value));
    }
    void next()
    {
        ++current;
    }
};

#endif // ENDIAN_HPP