Method isFileValid

Core/MMKV_IO.cpp:1654–1700

}

bool MMKV::isFileValid(const string &mmapID, const MMKVPath_t *relatePath) {
    if (!g_instanceLock) {
        return false;
    }
    SCOPED_LOCK(g_instanceLock);

    std::string realID, mmapKey;
    auto [kvPath, crcPath] = getStorage(mmapID, relatePath, realID, mmapKey);
    if (kvPath.empty()) {
        return true;
    }
    if (crcPath.empty()) {
        return false;
    }

    uint32_t crcFile = 0;
    MMBuffer *data = readWholeFile(crcPath);
    if (data) {
        if (data->getPtr()) {
            MMKVMetaInfo metaInfo;
            metaInfo.read(data->getPtr());
            crcFile = metaInfo.m_crcDigest;
        }
        delete data;
    } else {
        return false;
    }

    uint32_t crcDigest = 0;
    MMBuffer *fileData = readWholeFile(kvPath);
    if (fileData) {
        if (fileData->getPtr() && (fileData->length() >= Fixed32Size)) {
            uint32_t actualSize = 0;
            memcpy(&actualSize, fileData->getPtr(), Fixed32Size);
            if (actualSize > (fileData->length() - Fixed32Size)) {
                delete fileData;
                return false;
            }

            crcDigest = (uint32_t) CRC32(0, (const uint8_t *) fileData->getPtr() + Fixed32Size, (uint32_t) actualSize);
        }
        delete fileData;
        return crcFile == crcDigest;
    } else {
        return false;
    }
}

bool MMKV::removeStorage(const std::string &mmapID, const MMKVPath_t *relatePath) {
    if (!g_instanceLock) {