Method writeValueToBuffer

Core/MMKV.cpp:1042–1075

}

int32_t MMKV::writeValueToBuffer(MMKVKey_t key, void *ptr, int32_t size) {
    if (isKeyEmpty(key) || size < 0) {
        return -1;
    }
    auto s_size = static_cast<size_t>(size);

    SCOPED_LOCK(m_lock);
    SCOPED_LOCK(m_sharedProcessLock);
    auto data = getDataForKey(key);
    try {
        CodedInputData input(data.getPtr(), data.length());
        auto length = input.readInt32();
        auto offset = pbRawVarint32Size(length);
        if (length >= 0) {
            auto s_length = static_cast<size_t>(length);
            if (offset + s_length == data.length()) {
                if (s_length <= s_size) {
                    memcpy(ptr, (uint8_t *) data.getPtr() + offset, s_length);
                    return length;
                }
            } else {
                if (data.length() <= s_size) {
                    memcpy(ptr, data.getPtr(), data.length());
                    return static_cast<int32_t>(data.length());
                }
            }
        }
    } catch (std::exception &exception) {
        MMKVError("%s", exception.what());
    } catch (...) {
        MMKVError("encode fail");
    }
    return -1;
}

// enumerate