使用 zlib C++ 为 PDF 放气和充气

我正在尝试实现"zlib.h"放气和膨胀功能来压缩和解压缩PDF文件中的流。输入：来自PDF文件的压缩流。我实现了膨胀函数 - 没关系，我有未压缩的流，之后我尝试使用放气功能再次压缩此流，作为输出我有压缩流，但它不等于输入压缩流，它们不等于长度。我做错了什么？这是我代码的一部分：

     size_t outsize = (streamend - streamstart) * 10;
            char* output = new char[outsize]; ZeroMemory(output, outsize);
            z_stream zstrm; ZeroMemory(&zstrm, sizeof(zstrm));
            zstrm.avail_in = streamend - streamstart + 1;
            zstrm.avail_out = outsize;
            zstrm.next_in = (Bytef*)(buffer + streamstart);//block of date to infalte 
            zstrm.next_out = (Bytef*)output; 
            int rsti = inflateInit(&zstrm);
            if (rsti == Z_OK)
            {
                int rst2 = inflate(&zstrm, Z_FINISH);
                if (rst2 >= 0)
                {
                    cout << output << endl;//inflated data
                }
            }
            char* deflate_output = new char[streamend - streamstart];           
            ZeroMemory(deflate_output, streamend - streamstart);
            z_stream d_zstrm; ZeroMemory(&d_zstrm, sizeof(d_zstrm));
            d_zstrm.avail_in = (uInt) (strlen(output)+1);
            d_zstrm.avail_out = (uInt) (streamend - streamstart);
            d_zstrm.next_in = (Bytef*)(output);
            d_zstrm.next_out = (Bytef*)(deflate_output);
            int rsti1 = deflateInit(&d_zstrm, Z_DEFAULT_COMPRESSION);
            if (rsti1 == Z_OK)
            {
                int rst22 = deflate(&d_zstrm, Z_FINISH);
                out << deflate_output << endl << "**********************" << endl;
//I try to write deflated stream to file
                printf("New size of stream: %lun", (char*)d_zstrm.next_out - deflate_output);
            }