private boolean addOffset(final int offset) {
                count++;
                if (offsets.size() < MAX_OFFSETS) {
                    offsets.add(offset);
                    return true;
                } else {
                    return false;
                }
            }
@return True if the bytes could not be decoded using the {@link Charset} of
this {@link ByteStreamDecoder}
stroom-pipeline/src/main/java/stroom/pipeline/reader/ByteStreamDecoder.java