metadata[MetaSealedKeySSEC] = base64.StdEncoding.EncodeToString(sealedKey.Key[:])
	return metadata
}

// ParseMetadata extracts all SSE-C related values from the object metadata
// and checks whether they are well-formed. It returns the sealed object key
// on success.
func (ssec) ParseMetadata(metadata map[string]string) (sealedKey SealedKey, err error) {
	// Extract all required values from object metadata
	b64IV, ok := metadata[MetaIV]

		Description:    "Error parsing the X-Amz-Credential parameter; the Credential is mal-formed; expecting \"<YOUR-AKID>/YYYYMMDD/REGION/SERVICE/aws4_request\".",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrMalformedDate: {
		Code:           "MalformedDate",
		Description:    "Invalid date format header, expected to be in ISO8601, RFC1123 or RFC1123Z time format.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrMalformedPresignedDate: {

// AWS S3 compatible.
//
// Therefore, Format returns the last 16 bytes of an encrypted
// ETag.
//
// In general, a caller has to distinguish the following cases:
//   - The object is a multipart object. In this case,
//     Format returns the ETag unmodified.
//   - The object is a SSE-KMS or SSE-C encrypted single-
//     part object. In this case, Format returns the last

// malformed encoding is generated when chunk header is wrongly formed.
var errMalformedEncoding = errors.New("malformed chunked encoding")

// chunk is considered too big if its bigger than > 16MiB.
var errChunkTooBig = errors.New("chunk too big: choose chunk size <= 16MiB")

// newSignV4ChunkedReader returns a new s3ChunkedReader that translates the data read from r
// out of HTTP "chunked" format before returning it.

	ErrMalformedBucketObjectConfig = errors.New("invalid bucket object lock config")
	// ErrInvalidRetentionDate - indicates that retention date needs to be in ISO 8601 format
	ErrInvalidRetentionDate = errors.New("date must be provided in ISO 8601 format")
	// ErrPastObjectLockRetainDate - indicates that retention date must be in the future
	ErrPastObjectLockRetainDate = errors.New("the retain until date must be in the future")

		case c == '"':
			return string(d.scratch.bytes()), nil
		case c == '\\':
			c = d.next()
			goto scan_esc
		case c < 0x20:
			return "", d.mkError(ErrSyntax, "in string literal")
		// Coerce to well-formed UTF-8.
		default:
			d.scratch.add(c)
			if d.remaining() == 0 {
				return "", d.mkError(ErrSyntax, "in string literal")
			}
			c = d.next()
		}
	}

scan_esc:
	switch c {

		w.Header()[xhttp.AmzExpiration] = []string{
			fmt.Sprintf(`expiry-date="%s", rule-id="%s"`, event.Due.Format(http.TimeFormat), event.RuleID),
		}
	case TransitionAction, TransitionVersionAction:
		w.Header()[xhttp.MinIOTransition] = []string{
			fmt.Sprintf(`transition-date="%s", rule-id="%s"`, event.Due.Format(http.TimeFormat), event.RuleID),
		}
	}
}

	c.Assert(err, nil)
	request.Header.Set("If-Unmodified-Since", t.Add(-10*time.Minute).UTC().Format(http.TimeFormat))
	response, err = s.client.Do(request)
	c.Assert(err, nil)
	c.Assert(response.StatusCode, http.StatusPreconditionFailed)

	// make HTTP request to obtain object info.
	// But this time set a date with unrecognized format to the "If-Modified-Since" header

			if err = xml.Unmarshal(rec.Body.Bytes(), &cpObjResp); err != nil {
				t.Fatalf("Test %d: %s: Failed to parse the CopyObjectResult response: <ERROR> %s", i, instanceType, err)
			}

			// See if the new object is formed.
			// testing whether the copy was successful.
			// Note that this goes directly to the file system,
			// so encryption/compression may interfere at some point.
			buffers[0].Reset()

func TestFormatErasureEmpty(t *testing.T) {
	format := newFormatErasureV3(1, 16)
	format.Erasure.DistributionAlgo = formatErasureVersionV2DistributionAlgoV1
	formats := make([]*formatErasureV3, 16)

	for j := range 16 {
		newFormat := format.Clone()
		newFormat.Erasure.This = format.Erasure.Sets[0][j]
		formats[j] = newFormat
	}

	// empty format to indicate disk not found, but this
	// empty should return false.