params

/*
 * call-seq: params(level, strategy)
 * 
 * Changes the parameters of the deflate stream. See zlib.h for details. The
 * output from the stream by changing the params is preserved in output
 * buffer.
 *
 * TODO: document better!
 */
static VALUE
rb_deflate_params(obj, v_level, v_strategy)
    VALUE obj, v_level, v_strategy;
{
    struct zstream *z = get_zstream(obj);
    int level, strategy;
    int err;

    level = ARG_LEVEL(v_level);
    strategy = ARG_STRATEGY(v_strategy);

    zstream_run(z, (Bytef*)"", 0, Z_SYNC_FLUSH);
    err = deflateParams(&z->stream, level, strategy);
    while (err == Z_BUF_ERROR) {
        rb_warning("deflateParams() returned Z_BUF_ERROR");
        zstream_expand_buffer(z);
        err = deflateParams(&z->stream, level, strategy);
    }
    if (err != Z_OK) {
        raise_zlib_error(err, z->stream.msg);
    }

    return Qnil;
}