70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
#include "nfc_util.h"
|
|
|
|
#include <furi.h>
|
|
|
|
static const uint8_t nfc_util_odd_byte_parity[256] = {
|
|
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0,
|
|
1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1,
|
|
1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1,
|
|
0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0,
|
|
1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1,
|
|
0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0,
|
|
0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1,
|
|
0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
|
|
1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1};
|
|
|
|
void nfc_util_num2bytes(uint64_t src, uint8_t len, uint8_t* dest) {
|
|
furi_assert(dest);
|
|
furi_assert(len <= 8);
|
|
|
|
while(len--) {
|
|
dest[len] = (uint8_t)src;
|
|
src >>= 8;
|
|
}
|
|
}
|
|
|
|
uint64_t nfc_util_bytes2num(const uint8_t* src, uint8_t len) {
|
|
furi_assert(src);
|
|
furi_assert(len <= 8);
|
|
|
|
uint64_t res = 0;
|
|
while(len--) {
|
|
res = (res << 8) | (*src);
|
|
src++;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
uint8_t nfc_util_even_parity32(uint32_t data) {
|
|
// data ^= data >> 16;
|
|
// data ^= data >> 8;
|
|
// return !nfc_util_odd_byte_parity[data];
|
|
return (__builtin_parity(data) & 0xFF);
|
|
}
|
|
|
|
uint8_t nfc_util_odd_parity8(uint8_t data) {
|
|
return nfc_util_odd_byte_parity[data];
|
|
}
|
|
|
|
void nfc_util_odd_parity(const uint8_t* src, uint8_t* dst, uint8_t len) {
|
|
furi_assert(src);
|
|
furi_assert(dst);
|
|
|
|
uint8_t parity = 0;
|
|
uint8_t bit = 0;
|
|
while(len--) {
|
|
parity |= nfc_util_odd_parity8(*src) << (7 - bit); // parity is MSB first
|
|
bit++;
|
|
if(bit == 8) {
|
|
*dst = parity;
|
|
dst++;
|
|
parity = 0;
|
|
bit = 0;
|
|
}
|
|
src++;
|
|
}
|
|
|
|
if(bit) {
|
|
*dst = parity;
|
|
}
|
|
} |