| | 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 | #include <stddef.h> |
| | 14 | |
| | 15 | typedef struct crc { |
| | 16 | uint32_t state; |
| | 17 | int order; |
| | 18 | uint32_t polynom; |
| | 19 | uint32_t initial_value; |
| | 20 | uint32_t final_xor; |
| | 21 | uint32_t mask; |
| | 22 | } crc_t; |
| | 23 | |
| | 24 | /* Initialize a crc structure. order is the order of the polynom, e.g. 32 for a CRC-32 |
| | 25 | * polynom is the CRC polynom. initial_value is the initial value of a clean state. |
| | 26 | * final_xor is XORed onto the state before returning it from crc_result(). */ |
| | 27 | extern void crc_init(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor); |
| | 28 | |
| | 29 | /* Update the crc state. data is the data of length data_width bits (only the |
| | 30 | * data_width lower-most bits are used). |
| | 31 | */ |
| | 32 | extern void crc_update(crc_t *crc, uint32_t data, int data_width); |
| | 33 | |
| | 34 | /* Clean the crc state, e.g. reset it to initial_value */ |
| | 35 | extern void crc_clear(crc_t *crc); |
| | 36 | |
| | 37 | /* Get the result of the crc calculation */ |
| | 38 | extern uint32_t crc_finish(crc_t *crc); |
| | 39 | |
| | 40 | // Calculate CRC-8/Maxim checksum |
| | 41 | uint32_t CRC8Maxim(uint8_t *buff, size_t size ); |
| | 42 | /* Static initialization of a crc structure */ |
| | 43 | #define CRC_INITIALIZER(_order, _polynom, _initial_value, _final_xor) { \ |
| | 44 | .state = ((_initial_value) & ((1L<<(_order))-1)), \ |
| | 45 | .order = (_order), \ |
| | 46 | .polynom = (_polynom), \ |
| | 47 | .initial_value = (_initial_value), \ |
| | 48 | .final_xor = (_final_xor), \ |
| | 49 | .mask = ((1L<<(_order))-1) } |
| | 50 | |
| | 51 | #endif /* __CRC_H */ |
projects / proxmark3-svn / blame_incremental