if lgDir == "" {
		return os.Stderr, nil
	}
	lgDirAbs, err := filepath.Abs(lgDir)
	if err != nil {
		return nil, err
	}
	lgSize := ctx.Int("log-size")

	var fileNameFunc func() string
	if ctx.IsSet("log-prefix") {
		fileNameFunc = func() string {
			return fmt.Sprintf("%s-%s.log", ctx.String("log-prefix"), fmt.Sprintf("%X", time.Now().UTC().UnixNano()))
		}
	}

	output, err := logger.NewDir(logger.Options{

		}
	}

	checksumType := hash.NewChecksumHeader(r.Header)
	if checksumType.Is(hash.ChecksumInvalid) {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidChecksum), r.URL)
		return
	} else if checksumType.IsSet() && !checksumType.Is(hash.ChecksumTrailing) {
		opts.WantChecksum = &hash.Checksum{Type: checksumType}
	}

	if opts.WantChecksum != nil {

			}
		default:
			actualSize = n
		}
	}
	// If ServerSideChecksum is wanted for this object, it takes precedence
	// over opts.WantChecksum.
	if opts.WantServerSideChecksumType.IsSet() {
		serverSideChecksum := r.RawServerSideChecksumResult()
		if serverSideChecksum != nil {
			fi.Checksum = serverSideChecksum.AppendTo(nil, nil)
			if opts.EncryptFn != nil {

		// destination object using the x-amz-checksum-algorithm header.
		headerChecksumType := hash.NewChecksumHeader(r.Header)
		if headerChecksumType.IsSet() {
			dstOpts.WantServerSideChecksumType = headerChecksumType.Base()
			srcInfo.Reader.AddServerSideChecksumHasher(headerChecksumType)
			dstOpts.WantChecksum = nil
		} else {

	// Test Server needs to start before formatting of disks.
	// Get credential.
	credentials := globalActiveCred
	if !globalReplicationPool.IsSet() {
		globalReplicationPool.Set(nil)
	}
	testServer.Obj = objLayer
	testServer.rawDiskPaths = disks
	testServer.Disks = mustGetPoolEndpoints(0, disks...)
	testServer.AccessKey = credentials.AccessKey

	meta := make(map[string]string)
	cs, isMP = oi.decryptChecksums(partNum, h)
	for k, v := range cs {
		if k == xhttp.AmzChecksumType {
			continue
		}
		cktype := hash.ChecksumStringToType(k)
		if cktype.IsSet() {
			meta[cktype.Key()] = v
			meta[xhttp.AmzChecksumAlgo] = cktype.String()
		}
	}
	return meta, isMP