|
0
|
1 #include "crc32i.h"
|
|
|
2
|
|
|
3 uint32_t crc32qw_r(uint32_t crc, const unsigned char *message, size_t sz)
|
|
|
4 {
|
|
|
5 while (sz >= 4) {
|
|
|
6 union {
|
|
|
7 unsigned char b[4];
|
|
|
8 uint32_t w;
|
|
|
9 } w;
|
|
|
10
|
|
|
11 #if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 2)
|
|
|
12 /* Tell GCC that we will be aliasing */
|
|
|
13 w.w = *(__attribute__((__may_alias__)) uint32_t *)message;
|
|
|
14 #else
|
|
|
15 /* ... */
|
|
|
16 w.b[0] = message[0];
|
|
|
17 w.b[1] = message[1];
|
|
|
18 w.b[2] = message[2];
|
|
|
19 w.b[3] = message[3];
|
|
|
20 #endif
|
|
|
21
|
|
|
22 crc ^= w.w;
|
|
|
23
|
|
|
24 crc = (crc >> 8) ^ crc32_tab[crc & 0xFF];
|
|
|
25 crc = (crc >> 8) ^ crc32_tab[crc & 0xFF];
|
|
|
26 crc = (crc >> 8) ^ crc32_tab[crc & 0xFF];
|
|
|
27 crc = (crc >> 8) ^ crc32_tab[crc & 0xFF];
|
|
|
28
|
|
|
29 message += 4;
|
|
|
30 sz -= 4;
|
|
|
31 }
|
|
|
32
|
|
|
33 if (!sz) return crc;
|
|
|
34
|
|
|
35 return crc32c_r(crc, message, sz);
|
|
|
36 }
|
