1 /*
2  * Lame bswap replacements as we can't assume the host is sane and provides
3  * working versions of these.
4  */
5 
6 #ifndef _BSWAP_H
7 #define	_BSWAP_H 1
8 
9 #ifdef __linux__
10 # include <byteswap.h>
11 #else
12 
bswap_16(uint16_t x)13 static __inline__ uint16_t bswap_16(uint16_t x)
14 {
15 	return ((((x) & 0xff00) >> 8) | \
16 	        (((x) & 0x00ff) << 8));
17 }
bswap_32(uint32_t x)18 static __inline__ uint32_t bswap_32(uint32_t x)
19 {
20 	return ((((x) & 0xff000000) >> 24) | \
21 	        (((x) & 0x00ff0000) >>  8) | \
22 	        (((x) & 0x0000ff00) <<  8) | \
23 	        (((x) & 0x000000ff) << 24));
24 }
bswap_64(uint64_t x)25 static __inline__ uint64_t bswap_64(uint64_t x)
26 {
27 #define _uswap_64(x, sfx) \
28 	return ((((x) & 0xff00000000000000##sfx) >> 56) | \
29 	        (((x) & 0x00ff000000000000##sfx) >> 40) | \
30 	        (((x) & 0x0000ff0000000000##sfx) >> 24) | \
31 	        (((x) & 0x000000ff00000000##sfx) >>  8) | \
32 	        (((x) & 0x00000000ff000000##sfx) <<  8) | \
33 	        (((x) & 0x0000000000ff0000##sfx) << 24) | \
34 	        (((x) & 0x000000000000ff00##sfx) << 40) | \
35 	        (((x) & 0x00000000000000ff##sfx) << 56));
36 #if defined(__GNUC__)
37 	_uswap_64(x, ull)
38 #else
39 	_uswap_64(x, )
40 #endif
41 #undef _uswap_64
42 }
43 #endif
44 
45 #endif
46