kopia lustrzana https://github.com/jgromes/RadioLib
36 wiersze
716 B
C++
36 wiersze
716 B
C++
#include "CRC.h"
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RadioLibCRC::RadioLibCRC() {
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}
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uint32_t RadioLibCRC::checksum(const uint8_t* buff, size_t len) {
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uint32_t crc = this->init;
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size_t pos = 0;
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for(size_t i = 0; i < 8*len; i++) {
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if(i % 8 == 0) {
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uint32_t in = buff[pos++];
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if(this->refIn) {
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in = Module::reflect(in, 8);
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}
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crc ^= (in << (this->size - 8));
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}
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if(crc & ((uint32_t)1 << (this->size - 1))) {
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crc <<= (uint32_t)1;
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crc ^= this->poly;
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} else {
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crc <<= (uint32_t)1;
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}
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}
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crc ^= this->out;
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if(this->refOut) {
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crc = Module::reflect(crc, this->size);
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}
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crc &= (uint32_t)0xFFFFFFFF >> (32 - this->size);
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return(crc);
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}
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RadioLibCRC RadioLibCRCInstance;
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