Method generateRandomUUID

src/common/types/uuid.cpp:116–148

}

uuid UUID::generateRandomUUID(RandomEngine* engine) {
    uint8_t bytes[16];
    for (int i = 0; i < 16; i += 4) {
        *reinterpret_cast<uint32_t*>(bytes + i) = engine->nextRandomInteger();
    }
    // variant must be 10xxxxxx
    bytes[8] &= 0xBF;
    bytes[8] |= 0x80;
    // version must be 0100xxxx
    bytes[6] &= 0x4F;
    bytes[6] |= 0x40;

    int128_t result = 0;
    result.high = 0;
    result.high |= ((int64_t)bytes[0] << 56);
    result.high |= ((int64_t)bytes[1] << 48);
    result.high |= ((int64_t)bytes[2] << 40);
    result.high |= ((int64_t)bytes[3] << 32);
    result.high |= ((int64_t)bytes[4] << 24);
    result.high |= ((int64_t)bytes[5] << 16);
    result.high |= ((int64_t)bytes[6] << 8);
    result.high |= bytes[7];
    result.low = 0;
    result.low |= ((uint64_t)bytes[8] << 56);
    result.low |= ((uint64_t)bytes[9] << 48);
    result.low |= ((uint64_t)bytes[10] << 40);
    result.low |= ((uint64_t)bytes[11] << 32);
    result.low |= ((uint64_t)bytes[12] << 24);
    result.low |= ((uint64_t)bytes[13] << 16);
    result.low |= ((uint64_t)bytes[14] << 8);
    result.low |= bytes[15];
    return uuid{result};
}

const regex::RE2& UUID::regexPattern() {
    static regex::RE2 retval("(?i)[0-9A-F]{8}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{12}");