deflateInit
err = deflateInit(&stream, level);
ret = deflateInit(&def, Z_DEFAULT_COMPRESSION);
ret = deflateInit(&strm, level);
err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
err = deflateInit(&c_stream, Z_BEST_SPEED);
err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
err = deflateInit(&c_stream, Z_BEST_COMPRESSION);