C++中gzip压缩的流操作有哪些

在C++中，可以使用zlib库来进行gzip压缩和解压缩的操作。以下是使用zlib库进行gzip压缩和解压缩的流操作：

1. 压缩数据流：

#include <zlib.h>  std::string compressData(const std::string& data) {     z_stream strm;     strm.zalloc = Z_NULL;     strm.zfree = Z_NULL;     strm.opaque = Z_NULL;     strm.next_in = (Bytef*)data.data();     strm.avail_in = data.size();      if (deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 15 | 16, 8, Z_DEFAULT_STRATEGY) != Z_OK)     {         return "";     }      std::string compressedData;     char out[1024];      do     {         strm.next_out = (Bytef*)out;         strm.avail_out = sizeof(out);          if (deflate(&strm, Z_FINISH) == Z_STREAM_ERROR)         {             deflateEnd(&strm);             return "";         }          compressedData.append(out, sizeof(out) - strm.avail_out);     } while (strm.avail_out == 0);      deflateEnd(&strm);      return compressedData; }  

2. 解压缩数据流：

#include <zlib.h>  std::string decompressData(const std::string& compressedData) {     z_stream strm;     strm.zalloc = Z_NULL;     strm.zfree = Z_NULL;     strm.opaque = Z_NULL;     strm.next_in = (Bytef*)compressedData.data();     strm.avail_in = compressedData.size();      if (inflateInit2(&strm, 15 | 16) != Z_OK)     {         return "";     }      std::string decompressedData;     char out[1024];      do     {         strm.next_out = (Bytef*)out;         strm.avail_out = sizeof(out);          if (inflate(&strm, Z_NO_FLUSH) == Z_STREAM_ERROR)         {             inflateEnd(&strm);             return "";         }          decompressedData.append(out, sizeof(out) - strm.avail_out);     } while (strm.avail_out == 0);      inflateEnd(&strm);      return decompressedData; }