OAK MxID to Mac address utility

compile.sh

g++ mxid2mac.cpp -o mxid2mac

mxid2mac.cpp

#include <cstdio>
#include <array>
#include <cstdint>
#include <string>

uint32_t sbr_initial_checksum() {
    return 5381;
}

uint32_t sbr_compute_checksum_prev(const void* buffer, uint32_t size, uint32_t prev_checksum) {
    uint32_t checksum = prev_checksum;
    uint8_t* p = (uint8_t*)buffer;

    for(unsigned int i = 0; i < size; i++) {
        checksum = ((checksum << 5) + checksum) + p[i]; /* hash * 33 + p[i] */
    }

    return checksum;
}

uint32_t sbr_compute_checksum(const void* buffer, uint32_t size) {
    return sbr_compute_checksum_prev(buffer, size, sbr_initial_checksum());
}


// LUXONIS MAC base 44-A9-2C-3
static std::array<uint8_t, 6> macAddressOverride = {};
constexpr const uint8_t LUXONIS_MAC_ADDRESS_BASE[] = {0x44, 0xA9, 0x2C, 0x30, 0x00, 0x00};
std::string mxid2mac(std::string mxid) {

    uint8_t eaddr[] = {0x44, 0xA9, 0x2C, 0x30, 0x00, 0x00};

    int len = mxid.size();
    uint32_t checksum = sbr_compute_checksum(mxid.c_str(), len);

    uint8_t deviceMacAddress[] = {
        0x00, 0x00, 0x00,
        static_cast<uint8_t>((checksum >> 16) & 0x0F),
        static_cast<uint8_t>((checksum >> 8) & 0xFF),
        static_cast<uint8_t>(checksum & 0xFF)
    };

    for(int i = 0; i < 6; i++){
        eaddr[i] = LUXONIS_MAC_ADDRESS_BASE[i] | deviceMacAddress[i];
    }

    std::string res = "";
    for(int i = 0; i < 6; i++){
        char buff[16] = {};
        if(i < 5){
            snprintf(buff, sizeof(buff), "%02X:", eaddr[i]);
            // printf("%02X:", eaddr[i]);
        } else {
            snprintf(buff, sizeof(buff), "%02X", eaddr[i]);
            // printf("%02X\n", eaddr[i]);
        }
        res += buff;
    }

    return res;
}

int main(int argc, char** argv) {

    if(argc <= 1) {
        printf("Usage: %s [mxid]\n", argv[0]);
        return -1;
    }

    printf("%s\n", mxid2mac(argv[1]).c_str());
    return 0;
}