c++ zlib 解压gzip字符串

你可以使用zlib库来解压gzip字符串。以下是一个示例代码：

#include <iostream>
#include <string>
#include <zlib.h>

int main() {
    std::string compressed_data = "H4sIAAAAAAAAADWQywrCMAxF9yWw2w7H+P/yuEiZ7UQtjK0Lgk8pLiZvvXWvjZ0IaRbG4ni8v7Pf5vfu7PpfwMjH3j5mOj7zjJc9/f4/6oGtT3LJq6mfa1LWVz4eWjzU1Iy2h2rY1K3aLzR1c5+3qWVZ1kz1a3m5d8Xu7W3M5cZmz2L7pB7T7vB1yN5hK8zZVZaLjTm8v1hX6r5+M2+T0FfVfS1J8zW2+wsAAAA==";
    std::string decompressed_data;

    // Initialize zlib stream
    z_stream stream;
    stream.zalloc = Z_NULL;
    stream.zfree = Z_NULL;
    stream.opaque = Z_NULL;
    stream.avail_in = 0;
    stream.next_in = Z_NULL;
    int ret = inflateInit2(&stream, 15 + 32);

    if (ret != Z_OK) {
        std::cerr << "Failed to initialize zlib stream\n";
        return 1;
    }

    // Inflate the compressed data
    stream.avail_in = compressed_data.size();
    stream.next_in = (Bytef *)compressed_data.data();
    char outbuffer[32768];
    bool done = false;
    while (!done) {
        stream.avail_out = 32768;
        stream.next_out = (Bytef *)outbuffer;
        ret = inflate(&stream, Z_NO_FLUSH);
        switch (ret) {
            case Z_NEED_DICT:
            case Z_DATA_ERROR:
            case Z_MEM_ERROR:
                inflateEnd(&stream);
                std::cerr << "Failed to decompress data\n";
                return 1;
        }
        decompressed_data.append(outbuffer, 32768 - stream.avail_out);
        if (stream.avail_out != 0) {
            done = true;
        }
    }

    // Clean up
    inflateEnd(&stream);

    std::cout << "Decompressed data: " << decompressed_data << "\n";
    return 0;
}

在这个示例中，我们将gzip数据解压缩成字符串并打印。请注意，此示例仅适用于gzip数据。如果您要解压缩其他压缩格式（例如zlib或deflate），您需要使用不同的初始化选项。