#if DBG_FILTER
fprintf(stderr, "update: deflate (-> %zu) (w: %zu, r: %zu)\n", encoded_len, stream->writepos, stream->readpos);
#if DBG_FILTER
fprintf(stderr, "update: deflate (-> %zu) (w: %zu, r: %zu)\n", encoded_len, stream->writepos, stream->readpos);