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This commit is contained in:
Philippe Teuwen 2019-03-10 00:00:59 +01:00
commit 0373696662
483 changed files with 56514 additions and 52451 deletions
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45
common/crc.c
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@ -9,33 +9,37 @@
//
#include "crc.h"
void crc_init_ref(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor, bool refin, bool refout) {
void crc_init_ref(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor, bool refin, bool refout)
{
crc_init(crc, order, polynom, initial_value, final_xor);
crc->refin = refin;
crc->refout = refout;
crc_clear(crc);
}
void crc_init(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor) {
void crc_init(crc_t *crc, int order, uint32_t polynom, uint32_t initial_value, uint32_t final_xor)
{
crc->order = order;
crc->topbit = BITMASK( order-1 );
crc->topbit = BITMASK(order - 1);
crc->polynom = polynom;
crc->initial_value = initial_value;
crc->final_xor = final_xor;
crc->mask = (1L<<order)-1;
crc->mask = (1L << order) - 1;
crc->refin = false;
crc->refout = false;
crc_clear(crc);
}
void crc_clear(crc_t *crc) {
void crc_clear(crc_t *crc)
{
crc->state = crc->initial_value & crc->mask;
if (crc->refin)
crc->state = reflect(crc->state, crc->order);
}
void crc_update2(crc_t *crc, uint32_t data, int data_width){
void crc_update2(crc_t *crc, uint32_t data, int data_width)
{
if (crc->refin)
data = reflect(data, data_width);
@ -43,7 +47,7 @@ void crc_update2(crc_t *crc, uint32_t data, int data_width){
// Bring the next byte into the remainder.
crc->state ^= data << (crc->order - data_width);
for( uint8_t bit = data_width; bit > 0; --bit) {
for (uint8_t bit = data_width; bit > 0; --bit) {
if (crc->state & crc->topbit)
crc->state = (crc->state << 1) ^ crc->polynom;
@ -58,21 +62,22 @@ void crc_update(crc_t *crc, uint32_t data, int data_width)
data = reflect(data, data_width);
int i;
for(i=0; i<data_width; i++) {
for (i = 0; i < data_width; i++) {
int oldstate = crc->state;
crc->state = crc->state >> 1;
if( (oldstate^data) & 1 ) {
if ((oldstate ^ data) & 1) {
crc->state ^= crc->polynom;
}
data >>= 1;
}
}
uint32_t crc_finish(crc_t *crc) {
uint32_t crc_finish(crc_t *crc)
{
uint32_t val = crc->state;
if (crc->refout)
val = reflect(val, crc->order);
return ( val ^ crc->final_xor ) & crc->mask;
return (val ^ crc->final_xor) & crc->mask;
}
/*
@ -92,23 +97,26 @@ static void print_crc(crc_t *crc) {
*/
// width=8 poly=0x31 init=0x00 refin=true refout=true xorout=0x00 check=0xA1 name="CRC-8/MAXIM"
uint32_t CRC8Maxim(uint8_t *buff, size_t size) {
uint32_t CRC8Maxim(uint8_t *buff, size_t size)
{
crc_t crc;
crc_init_ref(&crc, 8, 0x31, 0, 0, true, true);
for ( int i=0; i < size; ++i)
for (int i = 0; i < size; ++i)
crc_update2(&crc, buff[i], 8);
return crc_finish(&crc);
}
// width=8 poly=0x1d, init=0xc7 (0xe3 - WRONG! but it mentioned in MAD datasheet) refin=false refout=false xorout=0x00 name="CRC-8/MIFARE-MAD"
uint32_t CRC8Mad(uint8_t *buff, size_t size) {
uint32_t CRC8Mad(uint8_t *buff, size_t size)
{
crc_t crc;
crc_init_ref(&crc, 8, 0x1d, 0xc7, 0, false, false);
for ( int i = 0; i < size; ++i)
for (int i = 0; i < size; ++i)
crc_update2(&crc, buff[i], 8);
return crc_finish(&crc);
}
// width=4 poly=0xC, reversed poly=0x7 init=0x5 refin=true refout=true xorout=0x0000 check= name="CRC-4/LEGIC"
uint32_t CRC4Legic(uint8_t *cmd, size_t size) {
uint32_t CRC4Legic(uint8_t *cmd, size_t size)
{
crc_t crc;
crc_init_ref(&crc, 4, 0x19 >> 1, 0x5, 0, true, true);
crc_update2(&crc, 1, 1); /* CMD_READ */
@ -118,10 +126,11 @@ uint32_t CRC4Legic(uint8_t *cmd, size_t size) {
}
// width=8 poly=0x63, reversed poly=0x8D init=0x55 refin=true refout=true xorout=0x0000 check=0xC6 name="CRC-8/LEGIC"
// the CRC needs to be reversed before returned.
uint32_t CRC8Legic(uint8_t *buff, size_t size) {
uint32_t CRC8Legic(uint8_t *buff, size_t size)
{
crc_t crc;
crc_init_ref(&crc, 8, 0x63, 0x55, 0, true, true);
for ( int i = 0; i < size; ++i)
for (int i = 0; i < size; ++i)
crc_update2(&crc, buff[i], 8);
return reflect8(crc_finish(&crc));
}