var flateWriterPool sync.Pool

func newFlateWriter(w io.Writer) io.WriteCloser {
	fw, ok := flateWriterPool.Get().(*flate.Writer)
	if ok {
		fw.Reset(w)
	} else {
		fw, _ = flate.NewWriter(w, 5)
	}
	return &pooledFlateWriter{fw: fw}
}

type pooledFlateWriter struct {
	mu sync.Mutex // guards Close and Write
	fw *flate.Writer
}

	return err
}

func createHealthJSONGzip(ctx context.Context, healthInfo madmin.HealthInfo) []byte {
	var b bytes.Buffer
	gzWriter := gzip.NewWriter(&b)

	header := struct {
		Version string `json:"version"`
	}{Version: healthInfo.Version}

	enc := json.NewEncoder(gzWriter)
	if e := enc.Encode(header); e != nil {

	if err != nil {
		return err
	}

	var (
		istioVersion, istioProxySha = c.getIstioVersionInfo(bootstrapDump)
		envoyVersion                = c.getUserAgentVersionInfo(bootstrapDump)

		tw = tabwriter.NewWriter(c.Stdout, 0, 8, 1, ' ', 0)
	)

	if len(istioVersion) > 0 {
		fmt.Fprintf(tw, "Istio Version:\t%s\n", istioVersion)
	}
	if len(istioProxySha) > 0 {
		fmt.Fprintf(tw, "Istio Proxy Version:\t%s\n", istioProxySha)

	b := make([]byte, length)
	for i := range b {
		b[i] = charset[randSrc.Intn(len(charset))]
	}
	return string(b)
}

func genSampleCSVData(count int) []byte {
	buf := &bytes.Buffer{}
	csvWriter := csv.NewWriter(buf)
	csvWriter.Write([]string{"id", "name", "age", "city"})

	for i := 0; i < count; i++ {
		csvWriter.Write([]string{
			strconv.Itoa(i),
			newRandString(10),
			newRandString(5),
			newRandString(10),

	// err is a persistent error.
	// It is only the responsibility of every exported method of Writer to
	// ensure that this error is sticky.
	err error
}

// NewWriter creates a new Writer writing to w.
func NewWriter(w io.Writer) *Writer {
	return &Writer{w: w, curr: &regFileWriter{w, 0}}
}

type fileWriter interface {
	io.Writer
	fileState

	ReadFrom(io.Reader) (int64, error)
}

func (gcs *warmBackendGCS) Put(ctx context.Context, key string, data io.Reader, length int64) (remoteVersionID, error) {
	object := gcs.client.Bucket(gcs.Bucket).Object(gcs.getDest(key))
	// TODO: set storage class
	w := object.NewWriter(ctx)
	if gcs.StorageClass != "" {
		w.ObjectAttrs.StorageClass = gcs.StorageClass
	}
	if _, err := xioutil.Copy(w, data); err != nil {
		return "", gcsToObjectError(err, gcs.Bucket, key)
	}

	return "", w.Close()

      assertThrows(IOException.class, () -> okSource.copyTo(new TestCharSink(option)));
      // ensure reader was closed IF it was opened (depends on implementation whether or not it's
      // opened at all if sink.newWriter() throws).
      assertTrue(
          "stream not closed when copying to sink with option: " + option,
          !okSource.wasStreamOpened() || okSource.wasStreamClosed());
    }
  }

      assertThrows(IOException.class, () -> okSource.copyTo(new TestCharSink(option)));
      // ensure reader was closed IF it was opened (depends on implementation whether or not it's
      // opened at all if sink.newWriter() throws).
      assertTrue(
          "stream not closed when copying to sink with option: " + option,
          !okSource.wasStreamOpened() || okSource.wasStreamClosed());
    }
  }

				return err
			}
			columnValue = string(b)
		default:
			return fmt.Errorf("Cannot marshal unhandled type: %T", kv.Value)
		}
		csvRecord = append(csvRecord, columnValue)
	}

	w := csv.NewWriter(writer)
	w.Comma = opts.FieldDelimiter
	w.Quote = opts.Quote
	w.AlwaysQuote = opts.AlwaysQuote
	w.QuoteEscape = opts.QuoteEscape
	if err := w.Write(csvRecord); err != nil {
		return err
	}
	w.Flush()

		"policy":                      encodedPolicy,
		"signature":                   signature,
		"X-Amz-Ignore-AWSAccessKeyId": "",
	}

	// Create the multipart form.
	var buf bytes.Buffer
	w := multipart.NewWriter(&buf)

	// Set the normal formData
	for k, v := range formData {
		w.WriteField(k, v)
	}
	// Set the File formData
	writer, err := w.CreateFormFile("file", "upload.txt")
	if err != nil {