@Override byte[] readBytes(int length) {
      require(length);
      byte[] result = new byte[length];
      System.arraycopy(buf, offset, result, 0, length);
      offset += length;
      return result;
    }
Do not use the buffer passed here after, as it may be manipulated directly.
zipkin/src/main/java/zipkin2/internal/ReadBuffer.java