func TestCanonicalizeETag(t *testing.T) {
	testCases := []struct {
		etag              string
		canonicalizedETag string
	}{
		{
			etag:              "\"\"\"",
			canonicalizedETag: "",
		},
		{
			etag:              "\"\"\"abc\"",
			canonicalizedETag: "abc",
		},
		{
			etag:              "abcd",
			canonicalizedETag: "abcd",
		},
		{
			etag:              "abcd\"\"",
			canonicalizedETag: "abcd",
		},
	}

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			if len(etag) >= 32 && strings.Count(etag, "-") != 1 {
				etag = etag[len(etag)-32:]
			}
		}
	}

	// We must not use the http.Header().Set method here because some (broken)
	// clients expect the ETag header key to be literally "ETag" - not "Etag" (case-sensitive).
	// Therefore, we have to set the ETag directly as map entry.
	w.Header()[xhttp.ETag] = []string{"\"" + etag + "\""}

		Bucket:                     o.Bucket,
		Name:                       o.Name,
		ModTime:                    o.ModTime,
		Size:                       o.Size,
		IsDir:                      o.IsDir,
		ETag:                       o.ETag,
		VersionID:                  o.VersionID,
		IsLatest:                   o.IsLatest,
		DeleteMarker:               o.DeleteMarker,
		TransitionedObject:         o.TransitionedObject,

	testCases := []struct {
		etag         string
		expectedETag string
	}{
		{`"8019e762"`, `8019e762-1`},
		{"5d57546eeb86b3eba68967292fba0644", "5d57546eeb86b3eba68967292fba0644-1"},
		{`"8019e762-1"`, `8019e762-1`},
		{"5d57546eeb86b3eba68967292fba0644-1", "5d57546eeb86b3eba68967292fba0644-1"},
	}
	for i, testCase := range testCases {
		etag := ToS3ETag(testCase.etag)
		if etag != testCase.expectedETag {

				continue
			}
			if v, ok := object.UserMetadata["X-Amz-Server-Side-Encryption"]; ok && v == "aws:kms" {
				log.Println("SKIPPED: encrypted with SSE-KMS do not have md5sum as ETag:", objFullPath(object))
				continue
			}
			parts := 1
			multipart := false
			s := strings.Split(object.ETag, "-")
			switch len(s) {
			case 1:

			continue
		}
		newMeta[k] = v
	}
	return newMeta
}

// Extracts etag value from the metadata.
func extractETag(metadata map[string]string) string {
	etag, ok := metadata["etag"]
	if !ok {
		// md5Sum tag is kept for backward compatibility.
		etag = metadata["md5Sum"]
	}
	// Success.
	return etag
}

// HasPrefix - Prefix matcher string matches prefix in a platform specific way.

	respHeader := make(map[string]string, len(wh))
	for k, v := range wh {
		respHeader[k] = strings.Join(v, ",")
	}
	entry.RespHeader = respHeader

	if etag := respHeader[xhttp.ETag]; etag != "" {
		respHeader[xhttp.ETag] = strings.Trim(etag, `"`)
	}

	return entry

	err = obj.MakeBucket(context.Background(), bucket, MakeBucketOptions{})
	if err != nil {
		b.Fatal(err)
	}

	objSize := 128 * humanize.MiByte

	// PutObjectPart returns etag of the object inserted.
	// etag variable is assigned with that value.
	var etag string
	// get text data generated for number of bytes equal to object size.
	textData := generateBytesData(objSize)
	// generate md5sum for the generated data.

	h := sha256.New()
	for i, meta := range metaArr {
		if !meta.IsValid() {
			continue
		}
		etagOnly := modTime.Equal(timeSentinel) && (etag != "" && etag == meta.Metadata["etag"])
		mtimeValid := meta.ModTime.Equal(modTime)
		if mtimeValid || etagOnly {
			fmt.Fprintf(h, "%v", meta.XLV1)
			for _, part := range meta.Parts {
				fmt.Fprintf(h, "part.%d", part.Number)
				fmt.Fprintf(h, "part.%d", part.Size)