deflate

/*
 * call-seq: deflate(string[, flush])
 *
 * Inputs +string+ into the deflate stream and returns the output from the
 * stream.  On calling this method, both the input and the output buffers of
 * the stream are flushed. If +string+ is nil, this method finishes the
 * stream, just like Zlib::ZStream#finish.
 *
 * The value of +flush+ should be either <tt>Zlib::NO_FLUSH</tt>,
 * <tt>Zlib::SYNC_FLUSH</tt>, <tt>Zlib::FULL_FLUSH</tt>, or
 * <tt>Zlib::FINISH</tt>. See zlib.h for details.
 *
 * TODO: document better!
 */
static VALUE
rb_deflate_deflate(argc, argv, obj)
    int argc;
    VALUE *argv;
    VALUE obj;
{
    struct zstream *z = get_zstream(obj);
    VALUE src, flush, dst;

    rb_scan_args(argc, argv, "11", &src, &flush);
    OBJ_INFECT(obj, src);
    do_deflate(z, src, ARG_FLUSH(flush));
    dst = zstream_detach_buffer(z);

    OBJ_INFECT(dst, obj);
    return dst;
}