]> git.zerfleddert.de Git - proxmark3-svn/blame - include/crc.h
fix broken formatting in command table
[proxmark3-svn] / include / crc.h
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68d9d60a 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
13typedef 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(). */
25extern 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 */
30extern 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 */
33extern void crc_clear(crc_t *crc);
34
35/* Get the result of the crc calculation */
36extern 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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