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
|
#include <inttypes.h>
#include <stdio.h>
int main(int argc, char *argv[])
{
/* Polynomial in bit-reversed notation */
uint64_t poly;
uint64_t crctab[256], v;
int i, j;
poly = strtoumax(argv[1], NULL, 0);
printf("/* C */\n");
printf("static const uint64_t crc64_tab[256] = {\n");
for (i = 0; i < 256; i++) {
v = i;
for (j = 0; j < 8; j++)
v = (v >> 1) ^ ((v & 1) ? poly : 0);
crctab[i] = v;
}
for (i = 0; i < 256; i += 2) {
printf(" /* %02x */ UINT64_C(0x%016"PRIx64"), "
"UINT64_C(0x%016"PRIx64")%s\n",
i, crctab[i], crctab[i+1], (i == 254) ? "" : ",");
}
printf("};\n\n");
printf("# perl\n");
printf("@crc64_tab = (\n");
for (i = 0; i < 256; i += 2) {
printf(" [0x%08"PRIx32", 0x%08"PRIx32"], "
"[0x%08"PRIx32", 0x%08"PRIx32"]%-1s # %02x\n",
(uint32_t)(crctab[i] >> 32),
(uint32_t)(crctab[i]),
(uint32_t)(crctab[i+1] >> 32),
(uint32_t)(crctab[i+1]),
(i == 254) ? "" : ",",
i);
}
printf(");\n");
return 0;
}
|
