code: protected Content getNextFile() throws IOException {
          JarEntry entry;
          if ((entry = jis.getNextJarEntry()) != null) {
              ByteArrayOutputStream bos = new ByteArrayOutputStream();
              byte[] data = new byte[BUFFER];
              int size;
              while ((size = jis.read(data, 0, data.length)) != -1) {
                  bos.write(data, 0, size);
              }
              Content file = new Content(entry.getName(), bos.toByteArray());
              bos.close();
              return file;
          }
          return null;
      }
docs: Get the next file as a {@link Content} in this archive.
  
  @return
  @throws IOException