bool PbEncoder::SerializeToString()

in pb.cpp [339:390]
41 lines of code
6 McCabe index (conditional complexity)

bool PbEncoder::SerializeToString(const LogGroup& logGroup, SLS_OUT std::string& out)
{
    size_t totalMsgSize = PbLength(logGroup);
    out.resize(totalMsgSize);

    // write in order
    char* begin = &out[0];
    char* pos = begin + totalMsgSize;

    // topic = 3
    if (!logGroup.topic.empty())
    {
        char* writeBeginPos = pos - WithFieldHeader(logGroup.topic.size());
        WriteStrWithHead(logGroup.topic, (char)((3 << 3) | 2), writeBeginPos);
        pos = writeBeginPos;
    }

    // source = 4
    if (!logGroup.source.empty())
    {
        char* writeBeginPos = pos - WithFieldHeader(logGroup.source.size());
        WriteStrWithHead(logGroup.source, (char)((4 << 3) | 2), writeBeginPos);
        pos = writeBeginPos;
    }

    // tags = 6
    for (auto it = logGroup.logTags.rbegin(); it != logGroup.logTags.rend(); ++it)
    {
        auto& logTag = *it;
        size_t msgSize = PbLength(logTag.key, logTag.value);
        char* writeBeginPos = pos - WithFieldHeader(msgSize);
        WriteStrPairWithHead((char)((6 << 3) | 2), msgSize, logTag.key, logTag.value, writeBeginPos);
        pos = writeBeginPos;
    }

    // logs = 1
    for (auto it = logGroup.logs.rbegin(); it != logGroup.logs.rend(); ++it)
    {
        auto& log = *it;
        size_t msgSize = PbLength(log);
        char* writeBeginPos = pos - WithFieldHeader(msgSize);
        WriteLogWithHead(msgSize, log, writeBeginPos);
        pos = writeBeginPos;
    }

    if (pos != begin)
    {
        out.clear();
        return false;
    }
    return true;
}