static final int HEADER_LENGTH = 8 + 8 + 8 + 3 + 1;
@NotNull
private final Excerpt excerpt;
public GatewayEntryWriter(Excerpt excerpt) {
this.excerpt = new WrappedExcerpt(excerpt) {
@Override
public void finish() {
writeInt24(HEADER_LENGTH - 4, position() - HEADER_LENGTH);
super.finish();
}