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