Function LoadLevel

Descent3/LoadLevel.cpp:3605–4167

Load a level file Returns 1 if file read ok, else 0

// Load a level file
// Returns 1 if file read ok, else 0
int LoadLevel(char *filename, void (*cb_fn)(const char *, int, int)) {
  CFILE *ifile;
  char tag[4];
  int n, i, retval = 1;

  int version;
  bool f_read_AABB = false;
  bool no_128s = true;
  int total = 0;
#ifdef EDITOR
  Disable_editor_rendering = 1;
  Num_failed_xlate_items = 0;
#endif
  PrintDedicatedMessage(TXT_DS_OPENLEVEL, filename);

  RestartLevelMD5();

  ifile = cfopen(filename, "rb");
  if (!ifile) {
    retval = 0;
    goto end_loadlevel;
  }

  try { // catch cfile errors

    filelen = cfilelength(ifile);

    // Read & check tag
    cf_ReadBytes((uint8_t *)tag, 4, ifile);
    if (strncmp(tag, LEVEL_FILE_TAG, 4)) {
      cfclose(ifile);
      retval = 0;
      goto end_loadlevel;
    }

    // Read & check version number
    version = cf_ReadInt(ifile);

    // Check for too-new version
    if (version > LEVEL_FILE_VERSION) {
      cfclose(ifile);
#if (defined(EDITOR) || defined(NEWEDITOR))
      if (GetFunctionMode() == EDITOR_MODE)
        EditorMessageBox("Can't load level file \"%s\": Its version (%d) is newer than current version (%d).", filename,
                         version, LEVEL_FILE_VERSION);
#endif
      retval = 0;
      goto end_loadlevel;
    }

    // Check for too-old version
    if (version < LEVEL_FILE_OLDEST_COMPATIBLE_VERSION) {
      cfclose(ifile);
#if (defined(EDITOR) || defined(NEWEDITOR))
      if (GetFunctionMode() == EDITOR_MODE)
        EditorMessageBox(
            "Can't load level file \"%s\": Its version (%d) is older than the oldest compatible version (%d).",
            filename, version, LEVEL_FILE_OLDEST_COMPATIBLE_VERSION);