return currentReadChunk.read();
        }

        @Override
        public int read(byte[] b, int off, int len) throws IOException {
            return readImpl(b, off, len);
        }

        int readImpl(byte[] b, int off, int len) {
            if (b == null) {
                throw new NullPointerException();
            }

            if ((off < 0) || (off > b.length) || (len < 0)