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CHG: merged the forum user @jason 's fixes to LEGIC. *UNTESTED*

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CHG: changed the CRC implementations.
This commit is contained in:
iceman1001 2016-07-28 21:41:44 +02:00
commit 3e134b4c20
16 changed files with 1368 additions and 163 deletions
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36
common/crc.h
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@ -9,8 +9,10 @@
#ifndef __CRC_H
#define __CRC_H
#include <stdint.h>
#include <stdint.h> //uint32+
#include <stdbool.h> //bool
#include <stddef.h>
#include "util.h" // reflect, bswap_16
typedef struct crc {
uint32_t state;
@ -19,13 +21,25 @@ typedef struct crc {
uint32_t initial_value;
uint32_t final_xor;
uint32_t mask;
int topbit;
bool refin; /* Parameter: Reflect input bytes? */
bool refout; /* Parameter: Reflect output CRC? */
} crc_t;
/* Initialize a crc structure. order is the order of the polynom, e.g. 32 for a CRC-32
* polynom is the CRC polynom. initial_value is the initial value of a clean state.
* final_xor is XORed onto the state before returning it from crc_result().
* refin is the setting for reversing (bitwise) the bytes during crc
* refot is the setting for reversing (bitwise) the crc byte before returning it.
*/
extern void crc_init_ref(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor, bool refin, bool refout);
/* Initialize a crc structure. order is the order of the polynom, e.g. 32 for a CRC-32
* polynom is the CRC polynom. initial_value is the initial value of a clean state.
* final_xor is XORed onto the state before returning it from crc_result(). */
extern void crc_init(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor);
/* Update the crc state. data is the data of length data_width bits (only the
* data_width lower-most bits are used).
*/
@ -40,9 +54,24 @@ extern uint32_t crc_finish(crc_t *crc);
// Calculate CRC-8/Maxim checksum
uint32_t CRC8Maxim(uint8_t *buff, size_t size);
// Calculate CRC-4/Legic checksum
uint32_t CRC4Legic(uint8_t *buff, size_t size);
// Calculate CRC-8/Legic checksum
uint32_t CRC8Legic(uint8_t *buff, size_t size);
// Calculate CRC-16/Legic checksum
// the initial_value is based on the previous legic_Crc8 of the UID.
// ie: uidcrc = 0x78 then initial_value == 0x7878
uint32_t CRC16Legic(uint8_t *buff, size_t size, uint8_t uidcrc);
// Calculate CRC-8/ja checksum
uint32_t CRC8ja(uint8_t *buff, size_t size);
// test crc 16.
uint32_t CRC16_DNP(uint8_t *buff, size_t size);
/* Static initialization of a crc structure */
#define CRC_INITIALIZER(_order, _polynom, _initial_value, _final_xor) { \
.state = ((_initial_value) & ((1L<<(_order))-1)), \
@ -50,6 +79,9 @@ uint32_t CRC8Legic(uint8_t *buff, size_t size);
.polynom = (_polynom), \
.initial_value = (_initial_value), \
.final_xor = (_final_xor), \
.mask = ((1L<<(_order))-1) }
.mask = ((1L<<(_order))-1) \
.refin = FALSE, \
.refout = FALSE \
}
#endif /* __CRC_H */