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
|
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#define CF_HASHTABLESIZE 8192
#define HOURLY 12
main() {
char s[] = "a";
char c;
int hash, box, minblocks;
int period=HOURLY-1;
char *boxes[HOURLY];
for (c=0; c<HOURLY; c++) {
boxes[c] = 0;
}
for (c='a';c <='z'; c++){
*s = c;
// The block algorithm is copied from evalfunction.c
hash=OatHash(s);
box = (int)(0.5 + period*hash/(double)CF_HASHTABLESIZE);
minblocks = box % HOURLY;
// Back to original code
if (!boxes[minblocks]) {
boxes[minblocks] = strncpy((char *)malloc(2),s,2);
}
}
printf(" \"ok\" xor => {\n");
for (c=0; c<HOURLY; c++) {
printf("\tsplayclass(\"%s\",\"hourly\"), # Box %d\n", boxes[c], c);
}
printf("\t};\n");
}
// This is copied from files_hashes.c
int OatHash(char *key)
{ unsigned int hashtablesize = CF_HASHTABLESIZE;
unsigned char *p = key;
unsigned h = 0;
int i, len = strlen(key);
for ( i = 0; i < len; i++ )
{
h += p[i];
h += ( h << 10 );
h ^= ( h >> 6 );
}
h += ( h << 3 );
h ^= ( h >> 11 );
h += ( h << 15 );
return (h & (hashtablesize-1));
}
|
