- const struct val_lab *vl = labels[i];
- char *label = recode_string (var_get_encoding (v), UTF8, val_lab_get_label (vl), -1);
- uint8_t len = MIN (strlen (label), 255);
-
- write_value (w, val_lab_get_value (vl), var_get_width (v));
- write_bytes (w, &len, 1);
- write_bytes (w, label, len);
- write_zeros (w, REM_RND_UP (len + 1, 8));
- free (label);
+ struct variable *v = dict_get_var (d, i);
+
+ if (var_has_value_labels (v) && var_get_width (v) <= 8)
+ {
+ const struct val_labs *val_labs = var_get_value_labels (v);
+ unsigned int hash = val_labs_hash (val_labs, 0);
+ struct label_set *set;
+
+ HMAP_FOR_EACH_WITH_HASH (set, struct label_set, hmap_node,
+ hash, &same_sets)
+ {
+ if (val_labs_equal (set->val_labs, val_labs))
+ {
+ if (set->n_indexes >= set->allocated_indexes)
+ set->indexes = x2nrealloc (set->indexes,
+ &set->allocated_indexes,
+ sizeof *set->indexes);
+ set->indexes[set->n_indexes++] = idx;
+ goto next_var;
+ }
+ }
+
+ set = xmalloc (sizeof *set);
+ set->val_labs = val_labs;
+ set->indexes = xmalloc (sizeof *set->indexes);
+ set->indexes[0] = idx;
+ set->n_indexes = 1;
+ set->allocated_indexes = 1;
+ hmap_insert (&same_sets, &set->hmap_node, hash);
+
+ if (n_sets >= allocated_sets)
+ sets = x2nrealloc (sets, &allocated_sets, sizeof *sets);
+ sets[n_sets++] = set;
+ }
+
+ next_var:
+ idx += sfm_width_to_octs (var_get_width (v));
+ }
+
+ for (i = 0; i < n_sets; i++)
+ {
+ const struct label_set *set = sets[i];
+ const struct val_labs *val_labs = set->val_labs;
+ size_t n_labels = val_labs_count (val_labs);
+ int width = val_labs_get_width (val_labs);
+ const struct val_lab **labels;
+ size_t j;
+
+ /* Value label record. */
+ write_int (w, 3); /* Record type. */
+ write_int (w, n_labels);
+ labels = val_labs_sorted (val_labs);
+ for (j = 0; j < n_labels; j++)
+ {
+ const struct val_lab *vl = labels[j];
+ char *label = recode_string (dict_get_encoding (d), UTF8,
+ val_lab_get_escaped_label (vl), -1);
+ uint8_t len = MIN (strlen (label), 255);
+
+ write_value (w, val_lab_get_value (vl), width);
+ write_bytes (w, &len, 1);
+ write_bytes (w, label, len);
+ write_zeros (w, REM_RND_UP (len + 1, 8));
+ free (label);
+ }
+ free (labels);
+
+ /* Value label variable record. */
+ write_int (w, 4); /* Record type. */
+ write_int (w, set->n_indexes);
+ for (j = 0; j < set->n_indexes; j++)
+ write_int (w, set->indexes[j] + 1);