1 #include <u.h>
2 #include <libc.h>
3 #include <bio.h>
4 #include <mach.h>
5 
6 /*
7  * big-endian short
8  */
9 u16int
10 beswap2(u16int s)
11 {
12 	uchar *p;
13 
14 	p = (uchar*)&s;
15 	return (p[0]<<8) | p[1];
16 }
17 
18 /*
19  * big-endian long
20  */
21 u32int
22 beswap4(u32int l)
23 {
24 	uchar *p;
25 
26 	p = (uchar*)&l;
27 	return (p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
28 }
29 
30 /*
31  * big-endian vlong
32  */
33 u64int
34 beswap8(u64int v)
35 {
36 	uchar *p;
37 
38 	p = (uchar*)&v;
39 	return ((u64int)p[0]<<56) | ((u64int)p[1]<<48) | ((u64int)p[2]<<40)
40 				 | ((u64int)p[3]<<32) | ((u64int)p[4]<<24)
41 				 | ((u64int)p[5]<<16) | ((u64int)p[6]<<8)
42 				 | (u64int)p[7];
43 }
44 
45 /*
46  * little-endian short
47  */
48 u16int
49 leswap2(u16int s)
50 {
51 	uchar *p;
52 
53 	p = (uchar*)&s;
54 	return (p[1]<<8) | p[0];
55 }
56 
57 /*
58  * little-endian long
59  */
60 u32int
61 leswap4(u32int l)
62 {
63 	uchar *p;
64 
65 	p = (uchar*)&l;
66 	return (p[3]<<24) | (p[2]<<16) | (p[1]<<8) | p[0];
67 }
68 
69 /*
70  * little-endian vlong
71  */
72 u64int
73 leswap8(u64int v)
74 {
75 	uchar *p;
76 
77 	p = (uchar*)&v;
78 	return ((u64int)p[7]<<56) | ((u64int)p[6]<<48) | ((u64int)p[5]<<40)
79 				 | ((u64int)p[4]<<32) | ((u64int)p[3]<<24)
80 				 | ((u64int)p[2]<<16) | ((u64int)p[1]<<8)
81 				 | (u64int)p[0];
82 }
83 
84 u16int
85 leload2(uchar *b)
86 {
87 	return b[0] | (b[1]<<8);
88 }
89 
90 u32int
91 leload4(uchar *b)
92 {
93 	return b[0] | (b[1]<<8) | (b[2]<<16) | (b[3]<<24);
94 }
95 
96 u64int
97 leload8(uchar *b)
98 {
99 	return leload4(b) | ((uvlong)leload4(b+4) << 32);
100 }
101 
102 u16int
103 beload2(uchar *b)
104 {
105 	return (b[0]<<8) | b[1];
106 }
107 
108 u32int
109 beload4(uchar *b)
110 {
111 	return (b[0]<<24) | (b[1]<<16) | (b[2]<<8) | b[3];
112 }
113 
114 u64int
115 beload8(uchar *b)
116 {
117 	return ((uvlong)beload4(b) << 32) | beload4(b+4);
118 }