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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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