return stemmerOverrideService.getStemmerOverrideFile(body.dictId)
                .map(file -> asStream(new File(file.getPath()).getName()).contentTypeOctetStream().stream(out -> {
                    file.writeOut(out);
                }))
                .orElseGet(() -> {
                    throwValidationErrorApi(messages -> messages.addErrorsFailedToDownloadProtwordsFile(GLOBAL));
                    return null;

        return stopwordsService.getStopwordsFile(form.dictId)
                .map(file -> asStream(new File(file.getPath()).getName()).contentTypeOctetStream().stream(out -> {
                    file.writeOut(out);
                }))
                .orElseGet(() -> {
                    throwValidationError(messages -> messages.addErrorsFailedToDownloadStopwordsFile(GLOBAL),

     *
     * @param out the output stream to write to
     * @throws IOException if an I/O error occurs during writing
     */
    public void writeOut(final WrittenStreamOut out) throws IOException {
        try (final CurlResponse curlResponse = dictionaryManager.getContentResponse(this);

        return charMappingService.getCharMappingFile(form.dictId)
                .map(file -> asStream(new File(file.getPath()).getName()).contentTypeOctetStream().stream(out -> {
                    file.writeOut(out);
                }))
                .orElseGet(() -> {
                    throwValidationError(messages -> messages.addErrorsFailedToDownloadMappingFile(GLOBAL),

        return protwordsService.getProtwordsFile(form.dictId)
                .map(file -> asStream(new File(file.getPath()).getName()).contentTypeOctetStream().stream(out -> {
                    file.writeOut(out);
                }))
                .orElseGet(() -> {
                    throwValidationError(messages -> messages.addErrorsFailedToDownloadProtwordsFile(GLOBAL),

        return stemmerOverrideService.getStemmerOverrideFile(form.dictId)
                .map(file -> asStream(new File(file.getPath()).getName()).contentTypeOctetStream().stream(out -> {
                    file.writeOut(out);
                }))
                .orElseGet(() -> {
                    throwValidationError(messages -> messages.addErrorsFailedToDownloadStemmeroverrideFile(GLOBAL),

        return kuromojiService.getKuromojiFile(form.dictId)
                .map(file -> asStream(new File(file.getPath()).getName()).contentTypeOctetStream().stream(out -> {
                    file.writeOut(out);
                }))
                .orElseGet(() -> {
                    throwValidationError(messages -> messages.addErrorsFailedToDownloadKuromojiFile(GLOBAL),

        return synonymService.getSynonymFile(form.dictId)
                .map(file -> asStream(new File(file.getPath()).getName()).contentTypeOctetStream().stream(out -> {
                    file.writeOut(out);
                }))
                .orElseGet(() -> {
                    throwValidationError(messages -> messages.addErrorsFailedToDownloadSynonymFile(GLOBAL),

	for i := range w.buffer {
		delete(w.buffer, i)
	}
	w.wg.Wait()
	return err
}

type writerAt struct {
	w      *io.PipeWriter
	r      *io.PipeReader
	wg     *sync.WaitGroup
	buffer map[int64][]byte
	err    error

	nextOffset int64
	m          sync.Mutex
}

func (w *writerAt) WriteAt(b []byte, offset int64) (n int, err error) {
	w.m.Lock()
	defer w.m.Unlock()

    }

    @Test
    @DisplayName("writeUTF(): prefixes size and writes encoded bytes")
    void writeUTF_encodesAndPrefixes() throws Exception {
        SmbRandomAccessFile raf = spy(newInstance("rw", false, true, false));
        doNothing().when(raf).write(any(byte[].class), anyInt(), anyInt());
        doNothing().when(raf).writeShort(anyInt());

        raf.writeUTF("é"); // 2-byte UTF-8 char