+static void LoadLevelFromFileInfo_SP(struct LevelInfo *level,
+ struct LevelFileInfo *level_file_info)
+{
+ char *filename = level_file_info->filename;
+ FILE *file;
+ int nr = level_file_info->nr - leveldir_current->first_level;
+ int i, l, x, y;
+ char name_first, name_last;
+ struct LevelInfo multipart_level;
+ int multipart_xpos, multipart_ypos;
+ boolean is_multipart_level;
+ boolean is_first_part;
+ boolean reading_multipart_level = FALSE;
+ boolean use_empty_level = FALSE;
+
+ if (!(file = fopen(filename, MODE_READ)))
+ {
+ level->no_valid_file = TRUE;
+
+ Error(ERR_WARN, "cannot read level '%s' -- using empty level", filename);
+
+ return;
+ }
+
+ /* position file stream to the requested level inside the level package */
+ if (fseek(file, nr * SP_LEVEL_SIZE, SEEK_SET) != 0)
+ {
+ level->no_valid_file = TRUE;
+
+ Error(ERR_WARN, "cannot fseek level '%s' -- using empty level", filename);
+
+ return;
+ }
+
+ /* there exist Supaplex level package files with multi-part levels which
+ can be detected as follows: instead of leading and trailing dashes ('-')
+ to pad the level name, they have leading and trailing numbers which are
+ the x and y coordinations of the current part of the multi-part level;
+ if there are '?' characters instead of numbers on the left or right side
+ of the level name, the multi-part level consists of only horizontal or
+ vertical parts */
+
+ for (l = nr; l < NUM_SUPAPLEX_LEVELS_PER_PACKAGE; l++)
+ {
+ LoadLevelFromFileStream_SP(file, level, l);
+
+ /* check if this level is a part of a bigger multi-part level */
+
+ name_first = level->name[0];
+ name_last = level->name[SP_LEVEL_NAME_LEN - 1];
+
+ is_multipart_level =
+ ((name_first == '?' || (name_first >= '0' && name_first <= '9')) &&
+ (name_last == '?' || (name_last >= '0' && name_last <= '9')));
+
+ is_first_part =
+ ((name_first == '?' || name_first == '1') &&
+ (name_last == '?' || name_last == '1'));
+
+ /* correct leading multipart level meta information in level name */
+ for (i = 0; i < SP_LEVEL_NAME_LEN && level->name[i] == name_first; i++)
+ level->name[i] = '-';
+
+ /* correct trailing multipart level meta information in level name */
+ for (i = SP_LEVEL_NAME_LEN - 1; i>=0 && level->name[i] == name_last; i--)
+ level->name[i] = '-';
+
+ /* ---------- check for normal single level ---------- */
+
+ if (!reading_multipart_level && !is_multipart_level)
+ {
+ /* the current level is simply a normal single-part level, and we are
+ not reading a multi-part level yet, so return the level as it is */
+
+ break;
+ }
+
+ /* ---------- check for empty level (unused multi-part) ---------- */
+
+ if (!reading_multipart_level && is_multipart_level && !is_first_part)
+ {
+ /* this is a part of a multi-part level, but not the first part
+ (and we are not already reading parts of a multi-part level);
+ in this case, use an empty level instead of the single part */
+
+ use_empty_level = TRUE;
+
+ break;
+ }
+
+ /* ---------- check for finished multi-part level ---------- */
+
+ if (reading_multipart_level &&
+ (!is_multipart_level ||
+ strcmp(level->name, multipart_level.name) != 0))
+ {
+ /* we are already reading parts of a multi-part level, but this level is
+ either not a multi-part level, or a part of a different multi-part
+ level; in both cases, the multi-part level seems to be complete */
+
+ break;
+ }
+
+ /* ---------- here we have one part of a multi-part level ---------- */
+
+ reading_multipart_level = TRUE;
+
+ if (is_first_part) /* start with first part of new multi-part level */
+ {
+ /* copy level info structure from first part */
+ multipart_level = *level;
+
+ /* clear playfield of new multi-part level */
+ for (y = 0; y < MAX_LEV_FIELDY; y++)
+ for (x = 0; x < MAX_LEV_FIELDX; x++)
+ multipart_level.field[x][y] = EL_EMPTY;
+ }
+
+ if (name_first == '?')
+ name_first = '1';
+ if (name_last == '?')
+ name_last = '1';
+
+ multipart_xpos = (int)(name_first - '0');
+ multipart_ypos = (int)(name_last - '0');
+
+#if 0
+ printf("----------> part (%d/%d) of multi-part level '%s'\n",
+ multipart_xpos, multipart_ypos, multipart_level.name);
+#endif
+
+ if (multipart_xpos * SP_LEVEL_XSIZE > MAX_LEV_FIELDX ||
+ multipart_ypos * SP_LEVEL_YSIZE > MAX_LEV_FIELDY)
+ {
+ Error(ERR_WARN, "multi-part level is too big -- ignoring part of it");
+
+ break;
+ }
+
+ multipart_level.fieldx = MAX(multipart_level.fieldx,
+ multipart_xpos * SP_LEVEL_XSIZE);
+ multipart_level.fieldy = MAX(multipart_level.fieldy,
+ multipart_ypos * SP_LEVEL_YSIZE);
+
+ /* copy level part at the right position of multi-part level */
+ for (y = 0; y < SP_LEVEL_YSIZE; y++)
+ {
+ for (x = 0; x < SP_LEVEL_XSIZE; x++)
+ {
+ int start_x = (multipart_xpos - 1) * SP_LEVEL_XSIZE;
+ int start_y = (multipart_ypos - 1) * SP_LEVEL_YSIZE;
+
+ multipart_level.field[start_x + x][start_y + y] = level->field[x][y];
+ }
+ }
+ }
+
+ fclose(file);
+
+ if (use_empty_level)
+ {
+ setLevelInfoToDefaults(level);
+
+ level->fieldx = SP_LEVEL_XSIZE;
+ level->fieldy = SP_LEVEL_YSIZE;
+
+ for (y = 0; y < SP_LEVEL_YSIZE; y++)
+ for (x = 0; x < SP_LEVEL_XSIZE; x++)
+ level->field[x][y] = EL_EMPTY;
+
+ strcpy(level->name, "-------- EMPTY --------");
+
+ Error(ERR_WARN, "single part of multi-part level -- using empty level");
+ }
+
+ if (reading_multipart_level)
+ *level = multipart_level;
+}
+
+/* ------------------------------------------------------------------------- */
+/* functions for loading generic level */
+/* ------------------------------------------------------------------------- */
+