Endian
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/* -*-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]);
}
template<typename T>
void swapBytes(T& t) { swapBytes(reinterpret_cast<char*>(&t), sizeof(T)); }
}
#endif
osg
Definition AlphaFunc:19
osg::getCpuByteOrder
Endian getCpuByteOrder()
Definition Endian:27
osg::swapBytes8
void swapBytes8(char *in)
Definition Endian:63
osg::swapBytes16
void swapBytes16(char *in)
Definition Endian:71
osg::Endian
Endian
Definition Endian:22
osg::BigEndian
@ BigEndian
Definition Endian:23
osg::LittleEndian
@ LittleEndian
Definition Endian:24
osg::swapBytes
void swapBytes(char *in, unsigned int size)
Definition Endian:42
osg::swapBytes4
void swapBytes4(char *in)
Definition Endian:57
osg::swapBytes2
void swapBytes2(char *in)
Definition Endian:52