1 /*-
2 * COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or
3 * code or tables extracted from it, as desired without restriction.
4 */
5
6 #ifndef _SYS_GSB_CRC32_H_
7 #define _SYS_GSB_CRC32_H_
8
9 #include <sys/types.h>
10
11 #ifdef _KERNEL
12
13 extern const uint32_t crc32_tab[];
14
15 static __inline uint32_t
crc32_raw(const void * buf,size_t size,uint32_t crc)16 crc32_raw(const void *buf, size_t size, uint32_t crc)
17 {
18 const uint8_t *p = (const uint8_t *)buf;
19
20 while (size--)
21 crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
22 return (crc);
23 }
24
25 static __inline uint32_t
crc32(const void * buf,size_t size)26 crc32(const void *buf, size_t size)
27 {
28 uint32_t crc;
29
30 crc = crc32_raw(buf, size, ~0U);
31 return (crc ^ ~0U);
32 }
33 #endif
34
35 uint32_t calculate_crc32c(uint32_t crc32c, const unsigned char *buffer,
36 unsigned int length);
37
38 #if defined(__amd64__) || defined(__i386__)
39 uint32_t sse42_crc32c(uint32_t, const unsigned char *, unsigned);
40 #endif
41 #if defined(__aarch64__)
42 uint32_t armv8_crc32c(uint32_t, const unsigned char *, unsigned int);
43 #endif
44
45 #ifdef TESTING
46 uint32_t singletable_crc32c(uint32_t, const void *, size_t);
47 uint32_t multitable_crc32c(uint32_t, const void *, size_t);
48 #endif
49
50 #endif /* !_SYS_GSB_CRC32_H_ */
51