/**
* Configures the stream to write prefix file data.
*
* @throws ZipException if other contents have already been written to the output stream
*/
public void startPrefixFile() throws ZipException {
checkNotFinished();
if (!zipData.getEntries().isEmpty() || entry != null) {
throw new ZipException("Cannot add a prefix file after the zip contents have been started.");
}
writingPrefix = true;
}
