heatshrink 压缩库：如何从缓冲区压缩数据

// TODO 你的代码放在这里
const size_t outbuf_size = filesize + 128;
char* outbuf = new char[outbuf_size];
heatshrink_encoder* encoder = heatshrink_encoder_alloc(10, 4);
size_t tosink = filesize;
size_t output_size = 0;
while(tosink > 0) {
    size_t sunk = 0;
    auto err = heatshrink_encoder_sink(encoder, reinterpret_cast<uint8_t*>(buf), (size_t)filesize, &sunk);
    if(err != HSER_SINK_OK) {
        std::cerr << "Error sinking data" << std::endl;
        break;
    }
    if(sunk == 0) {
        std::cerr << "No data sunk" << std::endl;
        break;
    }
    // 检查已 sink 多少并更新 tosink
    tosink -= sunk;
    // 轮询输出
    size_t polled = 0;
    auto err2 = heatshrink_encoder_poll(encoder, reinterpret_cast<uint8_t*>(outbuf + output_size), outbuf_size - output_size, &polled);
    if(err2 == HSER_POLL_ERROR_NULL || err2 == HSER_POLL_ERROR_MISUSE) {
        std::cerr << "Error polling data" << std::endl;
        break;
    }
    output_size += polled;
}
// 输入数据完成
auto err3 = heatshrink_encoder_finish(encoder);
// 轮询最终输出
// 轮询输出
size_t polled = 0;
auto err2 = heatshrink_encoder_poll(encoder, reinterpret_cast<uint8_t*>(outbuf + output_size), outbuf_size - output_size, &polled);
if(err2 == HSER_POLL_ERROR_NULL || err2 == HSER_POLL_ERROR_MISUSE) {
    std::cerr << "Error finally polling data" << std::endl;
}
output_size += polled;

cout << "Original size: " << filesize << ", compressed size: " << output_size << endl;