86 lines
1.8 KiB
C++
86 lines
1.8 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
|
|
*
|
|
* This library is open source and may be redistributed and/or modified under
|
|
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
|
|
* (at your option) any later version. The full license is in LICENSE file
|
|
* included with this distribution, and on the openscenegraph.org website.
|
|
*
|
|
* 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
|
|
* OpenSceneGraph Public License for more details.
|
|
*/
|
|
|
|
#ifndef OSG_ENDIAN
|
|
#define OSG_ENDIAN 1
|
|
|
|
#include <algorithm>
|
|
|
|
namespace osg {
|
|
|
|
enum Endian
|
|
{
|
|
BigEndian,
|
|
LittleEndian
|
|
};
|
|
|
|
inline Endian getCpuByteOrder()
|
|
{
|
|
union {
|
|
char big_endian_1[2];
|
|
short is_it_really_1;
|
|
} u;
|
|
u.big_endian_1[0] = 0;
|
|
u.big_endian_1[1] = 1;
|
|
|
|
if (u.is_it_really_1 == 1)
|
|
return BigEndian;
|
|
else
|
|
return LittleEndian;
|
|
}
|
|
|
|
inline void swapBytes( char* in, unsigned int size )
|
|
{
|
|
char* start = in;
|
|
char* end = start+size-1;
|
|
while (start<end)
|
|
{
|
|
std::swap(*start++,*end--);
|
|
}
|
|
}
|
|
|
|
inline void swapBytes2( char* in )
|
|
{
|
|
std::swap(in[0],in[1]);
|
|
}
|
|
|
|
inline void swapBytes4( char* in )
|
|
{
|
|
std::swap(in[0],in[3]);
|
|
std::swap(in[1],in[2]);
|
|
}
|
|
|
|
inline void swapBytes8( char* in )
|
|
{
|
|
std::swap(in[0],in[7]);
|
|
std::swap(in[1],in[6]);
|
|
std::swap(in[2],in[5]);
|
|
std::swap(in[3],in[4]);
|
|
}
|
|
|
|
inline void swapBytes16( char* in )
|
|
{
|
|
std::swap(in[0],in[15]);
|
|
std::swap(in[1],in[14]);
|
|
std::swap(in[2],in[13]);
|
|
std::swap(in[3],in[12]);
|
|
std::swap(in[4],in[11]);
|
|
std::swap(in[5],in[10]);
|
|
std::swap(in[6],in[9]);
|
|
std::swap(in[7],in[8]);
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|