code: static Asset createFromUncompressedMap(FileMap dataMap,
        AccessMode mode)
    {
      _FileAsset pAsset;
      int result;
  
      pAsset = new _FileAsset();
      result = pAsset.openChunk(dataMap);
      if (result != NO_ERROR)
        return null;
  
      pAsset.mAccessMode = mode;
      return pAsset;
    }
docs: /*
  Create a new Asset from a memory mapping.