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