imports = "com.google.common.io.Files")
  @CanIgnoreReturnValue // some processors won't return a useful result
  @ParametricNullness
  public
  static <T extends @Nullable Object> T readBytes(File file, ByteProcessor<T> processor)
      throws IOException {
    return asByteSource(file).read(processor);
  }

  /**
   * Computes the hash code of the {@code file} using {@code hashFunction}.
   *

pkg bufio, method (*Reader) Peek(int) ([]uint8, error)
pkg bufio, method (*Reader) Read([]uint8) (int, error)
pkg bufio, method (*Reader) ReadByte() (uint8, error)
pkg bufio, method (*Reader) ReadBytes(uint8) ([]uint8, error)
pkg bufio, method (*Reader) ReadLine() ([]uint8, bool, error)
pkg bufio, method (*Reader) ReadRune() (int32, int, error)
pkg bufio, method (*Reader) ReadSlice(uint8) ([]uint8, error)