- t->map = xmalloc(s->size);
- memcpy(t->map, s->map, t->size);
+ if (s->size)
+ {
+ t->map = solv_malloc(s->size);
+ memcpy(t->map, s->map, s->size);
+ }
+ else
+ t->map = 0;
+}
+
+/* grow a map */
+void
+map_grow(Map *m, int n)
+{
+ n = (n + 7) >> 3;
+ if (m->size < n)
+ {
+ m->map = solv_realloc(m->map, n);
+ memset(m->map + m->size, 0, n - m->size);
+ m->size = n;
+ }
+}
+
+/* bitwise-ands maps t and s, stores the result in t. */
+void
+map_and(Map *t, Map *s)
+{
+ unsigned char *ti, *si, *end;
+ ti = t->map;
+ si = s->map;
+ end = ti + (t->size < s->size ? t->size : s->size);
+ while (ti < end)
+ *ti++ &= *si++;
+}
+
+/* bitwise-ors maps t and s, stores the result in t. */
+void
+map_or(Map *t, Map *s)
+{
+ unsigned char *ti, *si, *end;
+ if (t->size < s->size)
+ map_grow(t, s->size << 3);
+ ti = t->map;
+ si = s->map;
+ end = ti + (t->size < s->size ? t->size : s->size);
+ while (ti < end)
+ *ti++ |= *si++;
+}
+
+/* remove all set bits in s from t. */
+void
+map_subtract(Map *t, Map *s)
+{
+ unsigned char *ti, *si, *end;
+ ti = t->map;
+ si = s->map;
+ end = ti + (t->size < s->size ? t->size : s->size);
+ while (ti < end)
+ *ti++ &= ~*si++;