Method fullWriteback

Core/MMKV_IO.cpp:1135–1180

}

bool MMKV::fullWriteback(AESCrypt *newCrypter, bool onlyWhileExpire) {
    if (m_hasFullWriteback) {
        return true;
    }
    if (m_needLoadFromFile) {
        return true;
    }
    if (!isFileValid()) {
        MMKVWarning("[%s] file not valid", m_mmapID.c_str());
        return false;
    }
    if (isReadOnly()) {
        MMKVWarning("[%s] file readonly", m_mmapID.c_str());
        return false;
    }

    if (mmkv_unlikely(m_enableKeyExpire)) {
        auto expiredCount = filterExpiredKeys();
        if (onlyWhileExpire && expiredCount == 0) {
            return true;
        }
    }

    auto isEmpty = m_crypter ? m_dicCrypt->empty() : m_dic->empty();
    if (isEmpty) {
        clearAll();
        return true;
    }

    SCOPED_LOCK(m_exclusiveProcessLock);
    auto preparedData = m_crypter ? prepareEncode(*m_dicCrypt) : prepareEncode(*m_dic);
    auto sizeOfDic = preparedData.second;
    if (sizeOfDic > 0) {
        auto fileSize = m_file->getFileSize();
        if (sizeOfDic + Fixed32Size <= fileSize) {
            return doFullWriteBack(std::move(preparedData), newCrypter);
        } else {
            assert(0);
            assert(newCrypter == nullptr);
            // expandAndWriteBack() will extend file & full rewrite, no need to write back again
            auto newSize = sizeOfDic + Fixed32Size - fileSize;
            return expandAndWriteBack(newSize, std::move(preparedData));
        }
    }
    return false;
}

// we don't need to really serialize the dictionary, just reuse what's already in the file
static void