code: public byte []
  readByteArray(int len) throws WireParseException {
  	require(len);
  	byte [] out = new byte[len];
  	System.arraycopy(array, pos, out, 0, len);
  	pos += len;
  	return out;
  }
docs: Reads a byte array of a specified length from the stream.
  @return The byte array.
  @throws WireParseException The end of the stream was reached.