code: public void readFully(byte[] dst, int offset, int byteCount) throws IOException {
          primitiveTypes.readFully(dst, offset, byteCount);
      }
docs: Reads {@code byteCount} bytes from the source stream into the byte array {@code dst}.
  
  @param dst
  the byte array in which to store the bytes read.
  @param offset
  the initial position in {@code dst} to store the bytes
  read from the source stream.
  @param byteCount
  the number of bytes to read.
  @throws EOFException
  if the end of the input is reached before the read
  request can be satisfied.
  @throws IOException
  if an error occurs while reading from the source stream.