| | 1 | /* |
| | 2 | * crc.h |
| | 3 | * |
| | 4 | * Generic CRC calculation code. |
| | 5 | * |
| | 6 | */ |
| | 7 | |
| | 8 | #ifndef CRC_H_ |
| | 9 | #define CRC_H_ |
| | 10 | |
| | 11 | #include <stdint.h> |
| | 12 | |
| | 13 | typedef struct crc { |
| | 14 | uint32_t state; |
| | 15 | int order; |
| | 16 | uint32_t polynom; |
| | 17 | uint32_t initial_value; |
| | 18 | uint32_t final_xor; |
| | 19 | uint32_t mask; |
| | 20 | } crc_t; |
| | 21 | |
| | 22 | /* Initialize a crc structure. order is the order of the polynom, e.g. 32 for a CRC-32 |
| | 23 | * polynom is the CRC polynom. initial_value is the initial value of a clean state. |
| | 24 | * final_xor is XORed onto the state before returning it from crc_result(). */ |
| | 25 | extern void crc_init(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor); |
| | 26 | |
| | 27 | /* Update the crc state. data is the data of length data_width bits (only the the |
| | 28 | * data_width lower-most bits are used). |
| | 29 | */ |
| | 30 | extern void crc_update(crc_t *crc, uint32_t data, int data_width); |
| | 31 | |
| | 32 | /* Clean the crc state, e.g. reset it to initial_value */ |
| | 33 | extern void crc_clear(crc_t *crc); |
| | 34 | |
| | 35 | /* Get the result of the crc calculation */ |
| | 36 | extern uint32_t crc_finish(crc_t *crc); |
| | 37 | |
| | 38 | /* Static initialization of a crc structure */ |
| | 39 | #define CRC_INITIALIZER(_order, _polynom, _initial_value, _final_xor) { \ |
| | 40 | .state = ((_initial_value) & ((1L<<(_order))-1)), \ |
| | 41 | .order = (_order), \ |
| | 42 | .polynom = (_polynom), \ |
| | 43 | .initial_value = (_initial_value), \ |
| | 44 | .final_xor = (_final_xor), \ |
| | 45 | .mask = ((1L<<(_order))-1) } |
| | 46 | |
| | 47 | #endif /* CRC_H_ */ |
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