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https://github.com/DarkFlippers/unleashed-firmware.git
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dd988ba449
* nfc_util functions for processing bytes moved into bit_lib * bitlib test update * bit_lib moved from lfrfid to standalone lib * Added bit functions for any supported data types * Error fix and api add * Added test for 64 * Added doc * Testcase for 64 rewrited * Realization error fix * API version bump * sync api version, fix after-merge old libs usage * fix build errors * build fix * fbt format Co-authored-by: assasinfil <nfa57643@gmail.com> Co-authored-by: gornekich <n.gorbadey@gmail.com> Co-authored-by: あく <alleteam@gmail.com>
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_assert(src);
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furi_assert(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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} |