C++ 빅데이터 개발 시 데이터 압축률 문제를 어떻게 처리하나요?

#include <zlib.h>

int CompressData(const std::string& input, std::string& output)
{
    z_stream strm;
    memset(&strm, 0, sizeof(z_stream));

    if (deflateInit(&strm, Z_DEFAULT_COMPRESSION) != Z_OK)
    {
        return -1;
    }

    strm.avail_in = input.size();
    strm.next_in = (Bytef*)input.data();

    int ret;
    do
    {
        char buf[1024];
        strm.avail_out = sizeof(buf);
        strm.next_out = (Bytef*)buf;

        ret = deflate(&strm, Z_FINISH);
        if (ret == Z_STREAM_ERROR)
        {
            deflateEnd(&strm);
            return -1;
        }

        int have = sizeof(buf) - strm.avail_out;
        output.append(buf, have);
    }
    while (strm.avail_out == 0);

    deflateEnd(&strm);

    return 0;
}

int DecompressData(const std::string& input, std::string& output)
{
    z_stream strm;
    memset(&strm, 0, sizeof(z_stream));

    if (inflateInit(&strm) != Z_OK)
    {
        return -1;
    }

    strm.avail_in = input.size();
    strm.next_in = (Bytef*)input.data();

    int ret;
    do
    {
        char buf[1024];
        strm.avail_out = sizeof(buf);
        strm.next_out = (Bytef*)buf;

        ret = inflate(&strm, Z_FINISH);
        if (ret == Z_STREAM_ERROR)
        {
            inflateEnd(&strm);
            return -1;
        }

        int have = sizeof(buf) - strm.avail_out;
        output.append(buf, have);
    }
    while (strm.avail_out == 0);

    inflateEnd(&strm);

    return 0;
}

std::string input = "This is a test string";
std::string compressedData;
std::string decompressedData;

if (CompressData(input, compressedData) == 0)
{
    // 压缩成功
    if (DecompressData(compressedData, decompressedData) == 0)
    {
        // 解压成功
        std::cout << "原始数据：" << input << std::endl;
        std::cout << "压缩后数据：" << compressedData << std::endl;
        std::cout << "解压后数据：" << decompressedData << std::endl;
    }
    else
    {
        std::cout << "解压失败" << std::endl;
    }
}
else
{
    std::cout << "压缩失败" << std::endl;
}