endian.h revision 9663:ace9a2ac3683 
1/*
2    libparted - a library for manipulating disk partitions
3    Copyright (C) 1998-2002, 2007 Free Software Foundation, Inc.
4
5    This program is free software; you can redistribute it and/or modify
6    it under the terms of the GNU General Public License as published by
7    the Free Software Foundation; either version 3 of the License, or
8    (at your option) any later version.
9
10    This program is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13    GNU General Public License for more details.
14
15    You should have received a copy of the GNU General Public License
16    along with this program.  If not, see <http://www.gnu.org/licenses/>.
17*/
18
19/* should only be #included by files in libparted */
20
21#ifndef PED_ENDIAN_H_INCLUDED
22#define PED_ENDIAN_H_INCLUDED
23
24#include <stdint.h>
25
26/* returns the n'th least significant byte */
27#define _GET_BYTE(x, n)		( ((x) >> (8 * (n))) & 0xff )
28
29#define _PED_SWAP16(x)		( (_GET_BYTE(x, 0) << 8)	\
30				+ (_GET_BYTE(x, 1) << 0) )
31
32#define _PED_SWAP32(x)		( (_GET_BYTE(x, 0) << 24)	\
33				+ (_GET_BYTE(x, 1) << 16)	\
34				+ (_GET_BYTE(x, 2) << 8)	\
35				+ (_GET_BYTE(x, 3) << 0) )
36
37#define _PED_SWAP64(x)		( (_GET_BYTE(x, 0) << 56)	\
38				+ (_GET_BYTE(x, 1) << 48)	\
39				+ (_GET_BYTE(x, 2) << 40)	\
40				+ (_GET_BYTE(x, 3) << 32)	\
41				+ (_GET_BYTE(x, 4) << 24)	\
42				+ (_GET_BYTE(x, 5) << 16)	\
43				+ (_GET_BYTE(x, 6) << 8)	\
44				+ (_GET_BYTE(x, 7) << 0) )
45
46#define PED_SWAP16(x)		((uint16_t) _PED_SWAP16( (uint16_t) (x) ))
47#define PED_SWAP32(x)		((uint32_t) _PED_SWAP32( (uint32_t) (x) ))
48#define PED_SWAP64(x)		((uint64_t) _PED_SWAP64( (uint64_t) (x) ))
49
50#ifdef WORDS_BIGENDIAN
51
52#define PED_CPU_TO_LE16(x)	PED_SWAP16(x)
53#define PED_CPU_TO_BE16(x)	(x)
54#define PED_CPU_TO_LE32(x)	PED_SWAP32(x)
55#define PED_CPU_TO_BE32(x)	(x)
56#define PED_CPU_TO_LE64(x)	PED_SWAP64(x)
57#define PED_CPU_TO_BE64(x)	(x)
58
59#define PED_LE16_TO_CPU(x)	PED_SWAP16(x)
60#define PED_BE16_TO_CPU(x)	(x)
61#define PED_LE32_TO_CPU(x)	PED_SWAP32(x)
62#define PED_BE32_TO_CPU(x)	(x)
63#define PED_LE64_TO_CPU(x)	PED_SWAP64(x)
64#define PED_BE64_TO_CPU(x)	(x)
65
66#else /* !WORDS_BIGENDIAN */
67
68#define PED_CPU_TO_LE16(x)	(x)
69#define PED_CPU_TO_BE16(x)	PED_SWAP16(x)
70#define PED_CPU_TO_LE32(x)	(x)
71#define PED_CPU_TO_BE32(x)	PED_SWAP32(x)
72#define PED_CPU_TO_LE64(x)	(x)
73#define PED_CPU_TO_BE64(x)	PED_SWAP64(x)
74
75#define PED_LE16_TO_CPU(x)	(x)
76#define PED_BE16_TO_CPU(x)	PED_SWAP16(x)
77#define PED_LE32_TO_CPU(x)	(x)
78#define PED_BE32_TO_CPU(x)	PED_SWAP32(x)
79#define PED_LE64_TO_CPU(x)	(x)
80#define PED_BE64_TO_CPU(x)	PED_SWAP64(x)
81
82#endif /* !WORDS_BIGENDIAN */
83
84#endif /* PED_ENDIAN_H_INCLUDED */
85
86