| 1 | //----------------------------------------------------------------------------- |
| 2 | // This code is licensed to you under the terms of the GNU GPL, version 2 or, |
| 3 | // at your option, any later version. See the LICENSE.txt file for the text of |
| 4 | // the license. |
| 5 | //----------------------------------------------------------------------------- |
| 6 | // Generic CRC calculation code. |
| 7 | //----------------------------------------------------------------------------- |
| 8 | |
| 9 | #ifndef __PARITY_H |
| 10 | #define __PARITY_H |
| 11 | |
| 12 | #include <stdint.h> |
| 13 | |
| 14 | extern const uint8_t OddByteParity[256]; |
| 15 | |
| 16 | static inline uint8_t oddparity8(uint8_t bt) |
| 17 | { |
| 18 | return OddByteParity[bt]; |
| 19 | } |
| 20 | |
| 21 | |
| 22 | extern const uint8_t EvenByteParity[256]; |
| 23 | |
| 24 | static inline uint8_t evenparity8(const uint8_t bt) |
| 25 | { |
| 26 | return EvenByteParity[bt]; |
| 27 | } |
| 28 | |
| 29 | |
| 30 | static inline uint8_t evenparity32(uint32_t x) |
| 31 | { |
| 32 | x ^= x >> 16; |
| 33 | x ^= x >> 8; |
| 34 | return EvenByteParity[x & 0xff]; |
| 35 | } |
| 36 | |
| 37 | |
| 38 | #endif /* __PARITY_H */ |