memcpy(p->tmp_buf + sizeof(zint), &ref_count, sizeof(ref_count));
memcpy(p->tmp_buf + sizeof(zint)+sizeof(short),
&compression_method, sizeof(compression_method));
memcpy(p->tmp_buf + sizeof(zint), &ref_count, sizeof(ref_count));
memcpy(p->tmp_buf + sizeof(zint)+sizeof(short),
&compression_method, sizeof(compression_method));