Line | Branch | Decision | Exec | Source |
---|---|---|---|---|
1 | #include <stddef.h> | |||
2 | #include <stdint.h> | |||
3 | ||||
4 | #include "crc8hondak.h" | |||
5 | ||||
6 | 2 | static inline uint8_t crc_init(void) | ||
7 | { | |||
8 | 2 | return 0xff; | ||
9 | } | |||
10 | ||||
11 | 7 | static inline uint8_t crc_next(uint8_t crc, uint8_t data) | ||
12 | { | |||
13 | uint8_t eor; | |||
14 | 7 | unsigned int i = 8; | ||
15 | ||||
16 | 7 | crc ^= data; | ||
17 | do { | |||
18 | /* This might produce branchless code */ | |||
19 |
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56 | eor = crc & 1 ? 0xb8 : 0; | |
20 | 56 | crc >>= 1; | ||
21 | 56 | crc ^= eor; | ||
22 |
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56 | } while (--i); |
23 | ||||
24 | 7 | return crc; | ||
25 | } | |||
26 | ||||
27 | 2 | static inline uint8_t crc_final(uint8_t crc) { | ||
28 | 2 | return ~crc; | ||
29 | } | |||
30 | ||||
31 | 2 | uint8_t crc_hondak_calc(const uint8_t *data, size_t len) { | ||
32 | 2 | uint8_t crc = crc_init(); | ||
33 | ||||
34 |
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2 | if (len) do { |
35 | 7 | crc = crc_next(crc, *data++); | ||
36 |
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7 | } while (--len); |
37 | ||||
38 | 2 | return crc_final(crc); | ||
39 | } | |||
40 |