| 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 |