blob: aff2425a6169941c847bc5b8bb99db503aaaea8e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
/* Toggle the 16 bit unsigned integer pointed by *p from little endian to
* big endian */
void memrev16(void *p) {
unsigned char *x = p, t;
t = x[0];
x[0] = x[1];
x[1] = t;
}
/* Toggle the 32 bit unsigned integer pointed by *p from little endian to
* big endian */
void memrev32(void *p) {
unsigned char *x = p, t;
t = x[0];
x[0] = x[3];
x[3] = t;
t = x[1];
x[1] = x[2];
x[2] = t;
}
/* Toggle the 64 bit unsigned integer pointed by *p from little endian to
* big endian */
void memrev64(void *p) {
unsigned char *x = p, t;
t = x[0];
x[0] = x[7];
x[7] = t;
t = x[1];
x[1] = x[6];
x[6] = t;
t = x[2];
x[2] = x[5];
x[5] = t;
t = x[3];
x[3] = x[4];
x[4] = t;
}
#ifdef TESTMAIN
#include <stdio.h>
int main(void) {
char buf[32];
sprintf(buf,"ciaoroma");
memrev16(buf);
printf("%s\n", buf);
sprintf(buf,"ciaoroma");
memrev32(buf);
printf("%s\n", buf);
sprintf(buf,"ciaoroma");
memrev64(buf);
printf("%s\n", buf);
return 0;
}
#endif
|
