1/*
2 * Copyright (c) 2009, 2010
3 * Phillip Lougher <phillip@lougher.demon.co.uk>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2,
8 * or (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, write to the Free Software
17 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 *
19 * swap.c
20 */
21
22#ifndef linux
23#define __BYTE_ORDER BYTE_ORDER
24#define __BIG_ENDIAN BIG_ENDIAN
25#define __LITTLE_ENDIAN LITTLE_ENDIAN
26#else
27#include <endian.h>
28#endif
29
30#if __BYTE_ORDER == __BIG_ENDIAN
31void swap_le16(void *src, void *dest)
32{
33	unsigned char *s = src;
34	unsigned char *d = dest;
35
36	d[0] = s[1];
37	d[1] = s[0];
38}
39
40
41void swap_le32(void *src, void *dest)
42{
43	unsigned char *s = src;
44	unsigned char *d = dest;
45
46	d[0] = s[3];
47	d[1] = s[2];
48	d[2] = s[1];
49	d[3] = s[0];
50}
51
52
53void swap_le64(void *src, void *dest)
54{
55	unsigned char *s = src;
56	unsigned char *d = dest;
57
58	d[0] = s[7];
59	d[1] = s[6];
60	d[2] = s[5];
61	d[3] = s[4];
62	d[4] = s[3];
63	d[5] = s[2];
64	d[6] = s[1];
65	d[7] = s[0];
66}
67
68
69unsigned short inswap_le16(unsigned short num)
70{
71	return (num >> 8) |
72		((num & 0xff) << 8);
73}
74
75
76unsigned int inswap_le32(unsigned int num)
77{
78	return (num >> 24) |
79		((num & 0xff0000) >> 8) |
80		((num & 0xff00) << 8) |
81		((num & 0xff) << 24);
82}
83
84
85long long inswap_le64(long long n)
86{
87	unsigned long long num = n;
88
89	return (num >> 56) |
90		((num & 0xff000000000000LL) >> 40) |
91		((num & 0xff0000000000LL) >> 24) |
92		((num & 0xff00000000LL) >> 8) |
93		((num & 0xff000000) << 8) |
94		((num & 0xff0000) << 24) |
95		((num & 0xff00) << 40) |
96		((num & 0xff) << 56);
97}
98
99
100#define SWAP_LE_NUM(BITS) \
101void swap_le##BITS##_num(void *s, void *d, int n) \
102{\
103	int i;\
104	for(i = 0; i < n; i++, s += BITS / 8, d += BITS / 8)\
105		swap_le##BITS(s, d);\
106}
107
108SWAP_LE_NUM(16)
109SWAP_LE_NUM(32)
110SWAP_LE_NUM(64)
111
112#define INSWAP_LE_NUM(BITS, TYPE) \
113void inswap_le##BITS##_num(TYPE *s, int n) \
114{\
115	int i;\
116	for(i = 0; i < n; i++)\
117		s[i] = inswap_le##BITS(s[i]);\
118}
119
120INSWAP_LE_NUM(16, unsigned short)
121INSWAP_LE_NUM(32, unsigned int)
122INSWAP_LE_NUM(64, long long)
123#endif
124