Method loadCached

src/clientbase/WorldDownLoader.cpp:265–353

void WorldDownLoader::loadCached() {
  // can't get a cache from nothing
  if (worldCachePath.size() == 0) {
    joiningGame = false;
    return;
  }

  // lookup the cached world
  std::istream* cachedWorld = FILEMGR.createDataInStream(worldCachePath, true);
  if (!cachedWorld) {
    showError("World cache files disappeared.  Join canceled", true);
    remove(worldCachePath.c_str());
    joiningGame = false;
    return;
  }

  // status update
  showError("Loading world into memory...", true);

  // get the world size
  cachedWorld->seekg(0, std::ios::end);
  std::streampos size = cachedWorld->tellg();
  unsigned long charSize = std::streamoff(size);

  // load the cached world
  cachedWorld->seekg(0);
  char* localWorldDatabase = new char[charSize];
  if (!localWorldDatabase) {
    showError("Error loading cached world.  Join canceled", true);
    remove(worldCachePath.c_str());
    joiningGame = false;
    return;
  }
  cachedWorld->read(localWorldDatabase, charSize);
  delete cachedWorld;
  cachedWorld = NULL;

  // verify
  showError("Verifying world integrity...", true);
  MD5 md5;
  md5.update((unsigned char*)localWorldDatabase, charSize);
  md5.finalize();
  std::string digest = md5.hexdigest();
  if (digest != md5Digest) {
    if (worldBuilder) {
      delete worldBuilder;
      worldBuilder = NULL;
    }
    delete[] localWorldDatabase;
    localWorldDatabase = NULL;
    showError("Error on md5. Removing offending file.");
    remove(worldCachePath.c_str());
    joiningGame = false;
    return;
  }

  // make world
  showError("Preparing world...", true);