]> git.zerfleddert.de Git - proxmark3-svn/blob - include/crc.h
Fix Tune Samples (broken in commit 12/31 by me)
[proxmark3-svn] / include / crc.h
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 __CRC_H
10 #define __CRC_H
11
12 #include <stdint.h>
13
14 typedef struct crc {
15 uint32_t state;
16 int order;
17 uint32_t polynom;
18 uint32_t initial_value;
19 uint32_t final_xor;
20 uint32_t mask;
21 } crc_t;
22
23 /* Initialize a crc structure. order is the order of the polynom, e.g. 32 for a CRC-32
24 * polynom is the CRC polynom. initial_value is the initial value of a clean state.
25 * final_xor is XORed onto the state before returning it from crc_result(). */
26 extern void crc_init(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor);
27
28 /* Update the crc state. data is the data of length data_width bits (only the the
29 * data_width lower-most bits are used).
30 */
31 extern void crc_update(crc_t *crc, uint32_t data, int data_width);
32
33 /* Clean the crc state, e.g. reset it to initial_value */
34 extern void crc_clear(crc_t *crc);
35
36 /* Get the result of the crc calculation */
37 extern uint32_t crc_finish(crc_t *crc);
38
39 /* Static initialization of a crc structure */
40 #define CRC_INITIALIZER(_order, _polynom, _initial_value, _final_xor) { \
41 .state = ((_initial_value) & ((1L<<(_order))-1)), \
42 .order = (_order), \
43 .polynom = (_polynom), \
44 .initial_value = (_initial_value), \
45 .final_xor = (_final_xor), \
46 .mask = ((1L<<(_order))-1) }
47
48 #endif /* __CRC_H */
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