PIRL++

---

endian.hh

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/*  endian - Manages the endian-ness of data.

PIRL CVS ID: endian.hh,v 1.17 2007/02/01 00:20:09 castalia Exp

Copyright (C) 2003, 2004, 2005  Arizona Board of Regents 
on behalf of the Planetary Image Research Laboratory, 
Lunar and Planetary Laboratory at the University of Arizona.

This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License, version 2.1,
as published by the Free Software Foundation.

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 Lesser
General Public License for more details.

You should have received a copy of the GNU Lesser 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 _endian_h
#define _endian_h

namespace PIRL
{
const bool host_is_high_endian ();

inline const bool high_endian_host ()   {return host_is_high_endian ();}

inline const bool big_endian_host ()    {return host_is_high_endian ();}

inline const bool low_endian_host ()    {return ! host_is_high_endian ();}

inline const bool little_endian_host () {return ! host_is_high_endian ();}

void reorder_bytes (unsigned char* data, const unsigned long amount);

void reorder_bytes (unsigned char* data, const unsigned long groups,
    const unsigned int size);

void
swap_bytes
    (
    unsigned char*          data,
    const unsigned int      groups,
    const unsigned int      size
    );

template<typename T>
T&
MSB_native
    (
    T&  value
    )
{
if (! host_is_high_endian ())
    reorder_bytes
        (reinterpret_cast<unsigned char*>(&value), sizeof (T));
return value;
}
#define MSB_value   MSB_native

template<typename T>
T&
LSB_native
    (
    T&  value
    )
{
if (host_is_high_endian ())
    reorder_bytes
        (reinterpret_cast<unsigned char*>(&value), sizeof (T));
return value;
}
#define LSB_value   LSB_native


}   //  PIRL namespace
#endif

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