如何使用zlib轻松压缩和解压缩文件？

char buf[1024*1024*16];
gzFile *fi = (gzFile *)gzopen(\"file.gz\",\"rb\");
gzrewind(fi);
while(!gzeof(fi))
{
    int len = gzread(fi,buf,sizeof(buf));
        //buf contains len bytes of decompressed data
}
gzclose(fi);

gzFile *fi = (gzFile *)gzopen(\"file.gz\",\"wb\");
gzwrite(fi,\"my decompressed data\",strlen(\"my decompressed data\"));
gzclose(fi);