root/OpenSceneGraph/trunk/include/osg/Endian @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13
14#ifndef OSG_ENDIAN
15#define OSG_ENDIAN 1
16
17#include <algorithm>
18
19namespace osg {
20
21enum Endian
22{
23    BigEndian,
24    LittleEndian
25};
26
27inline Endian getCpuByteOrder()
28{
29    union {
30        char big_endian_1[2];
31        short is_it_really_1;
32    } u;
33    u.big_endian_1[0] = 0;
34    u.big_endian_1[1] = 1;
35
36    if (u.is_it_really_1 == 1)
37        return BigEndian;
38    else
39        return LittleEndian;
40}
41
42inline void swapBytes( char* in, unsigned int size )
43{
44    char* start = in;
45    char* end = start+size-1;
46    while (start<end)
47    {
48        std::swap(*start++,*end--);
49    }
50}
51
52inline void swapBytes2( char* in )
53{
54    std::swap(in[0],in[1]);
55}
56
57inline void swapBytes4( char* in )
58{
59    std::swap(in[0],in[3]);
60    std::swap(in[1],in[2]);
61}
62
63inline void swapBytes8( char* in )
64{
65    std::swap(in[0],in[7]);
66    std::swap(in[1],in[6]);
67    std::swap(in[2],in[5]);
68    std::swap(in[3],in[4]);
69}
70
71inline void swapBytes16( char* in )
72{
73    std::swap(in[0],in[15]);
74    std::swap(in[1],in[14]);
75    std::swap(in[2],in[13]);
76    std::swap(in[3],in[12]);
77    std::swap(in[4],in[11]);
78    std::swap(in[5],in[10]);
79    std::swap(in[6],in[9]);
80    std::swap(in[7],in[8]);
81}
82
83}
84
85#endif
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