Method doFullWriteBack

Core/MMKV_IO.cpp:1345–1383

#ifndef MMKV_DISABLE_CRYPT
bool MMKV::doFullWriteBack(pair<MMBuffer, size_t> prepared, AESCrypt *newCrypter, bool needSync) {
    auto ptr = (uint8_t *) m_file->getMemory();
    auto totalSize = prepared.second;

    uint8_t newIV[AES_IV_LEN];
    auto encrypter = (newCrypter == InvalidCryptPtr) ? nullptr : (newCrypter ? newCrypter : m_crypter);
    if (encrypter) {
        AESCrypt::fillRandomIV(newIV);
        encrypter->resetIV(newIV, sizeof(newIV));
    }

    delete m_output;
    m_output = new CodedOutputData(ptr + Fixed32Size, m_file->getFileSize() - Fixed32Size);
    if (m_crypter) {
        auto decrypter = m_crypter;
        memmoveDictionary(*m_dicCrypt, m_output, ptr, decrypter, encrypter, prepared);
    } else if (prepared.first.length() != 0) {
        auto &preparedData = prepared.first;
        fullWriteBackWholeData(std::move(preparedData), totalSize, m_output);
        if (encrypter) {
            encrypter->encrypt(ptr + Fixed32Size, ptr + Fixed32Size, totalSize);
        }
    } else {
        memmoveDictionary(*m_dic, m_output, ptr, encrypter, totalSize);
    }

    m_actualSize = totalSize;
    if (encrypter) {
        recalculateCRCDigestWithIV(newIV);
    } else {
        recalculateCRCDigestWithIV(nullptr);
    }
    m_hasFullWriteback = true;
    // make sure lastConfirmedMetaInfo is saved if needed
    if (needSync) {
        sync(MMKV_SYNC);
    }
    return true;
}

#else // MMKV_DISABLE_CRYPT