ByteOrder.hpp

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/*
    libglim: a C++ Free library render images using OpenGL
    Copyright (C) 2002 Nestal Wan

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General Public License for more details.

    You should have received a copy of the GNU General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
#ifndef __PICINFO_BYTE_ORDER_HEADER_INCLUDED__
#define __PICINFO_BYTE_ORDER_HEADER_INCLUDED__

#ifdef WIN32
    // win32 doesn't have these lovely values telling us the endianness
    // luckily windows is unportable enough to run on intel (which is
    // little-endian) only
    #define LITTLE_ENDIAN   1234
    #define BIG_ENDIAN      4321
    #define BYTE_ORDER      LITTLE_ENDIAN
#else
    // assume sys/param.h contain the endian symbols
    #include <sys/param.h>
#endif

namespace picinfo {

template <typename T>
T SwapBytes( int new_order, T value ) ;

template <typename T>
void SetByteOrder( int new_order, T& value )
{
    value = SwapBytes( new_order, value ) ;
}

template <typename FwdIt>
void SetByteOrder( int new_order, FwdIt first, FwdIt last )
{
    while ( first != last )
    {
        SetByteOrder( new_order, *first ) ;
        ++first ;
    }
}

} // end of namespace

#endif

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