+static game_params *decode_params(char const *string)
+{
+ game_params *ret = default_params();
+
+ switch (*string) {
+ case 't': ret->solid = TETRAHEDRON; string++; break;
+ case 'c': ret->solid = CUBE; string++; break;
+ case 'o': ret->solid = OCTAHEDRON; string++; break;
+ case 'i': ret->solid = ICOSAHEDRON; string++; break;
+ default: break;
+ }
+ ret->d1 = ret->d2 = atoi(string);
+ while (*string && isdigit(*string)) string++;
+ if (*string == 'x') {
+ string++;
+ ret->d2 = atoi(string);
+ }
+
+ return ret;
+}
+
+static char *encode_params(game_params *params)
+{
+ char data[256];
+
+ assert(params->solid >= 0 && params->solid < 4);
+ sprintf(data, "%c%dx%d", "tcoi"[params->solid], params->d1, params->d2);
+
+ return dupstr(data);
+}
+