// Specific instances for HS256, HS384, HS512
var (
	SigningMethodHS256 *SigningMethodHMAC
	SigningMethodHS384 *SigningMethodHMAC
	SigningMethodHS512 *SigningMethodHMAC
)

const base64BufferSize = 64 * humanize.KiByte

var (
	base64BufPool sync.Pool
	hmacSigners   []*SigningMethodHMAC
)

func init() {
	base64BufPool = sync.Pool{
		New: func() interface{} {
			buf := make([]byte, base64BufferSize)
			return &buf

	var splCount uint64
	for i, count := range h {
		szInt := ObjectsHistogramIntervals[i]
		switch {
		case humanize.KiByte == szInt.start && szInt.end == humanize.MiByte-1:
			// spl interval: [1024B, 1MiB)
			res[szInt.name] = splCount
		case humanize.KiByte <= szInt.start && szInt.end <= humanize.MiByte-1:
			// intervals that fall within the spl interval above; they
			// appear earlier in this array of intervals, see

	ctx := r.Context()

	globalSiteNetPerfRX.Connect()
	defer globalSiteNetPerfRX.Disconnect()

	connectTime := time.Now()
	for {
		n, err := io.CopyN(xioutil.Discard, r.Body, 128*humanize.KiByte)
		atomic.AddUint64(&globalSiteNetPerfRX.RX, uint64(n))
		if err != nil && err != io.EOF && err != io.ErrUnexpectedEOF {
			// If there is a disconnection before globalNetPerfMinDuration (we give a margin of error of 1 sec)

		return cred, "", "", time.Time{}, ErrSignatureDoesNotMatch
	}

	// Return calculated signature.
	return cred, newSignature, region, date, ErrNone
}

const maxLineLength = 4 * humanize.KiByte // assumed <= bufio.defaultBufSize 4KiB

// lineTooLong is generated as chunk header is bigger than 4KiB.
var errLineTooLong = errors.New("header line too long")

	fileSizeStr := r.Form.Get("filesize")

	blockSize, err := strconv.ParseUint(blockSizeStr, 10, 64)
	if err != nil {
		blockSize = 4 * humanize.MiByte // default value
	}

	fileSize, err := strconv.ParseUint(fileSizeStr, 10, 64)
	if err != nil {
		fileSize = 1 * humanize.GiByte // default value
	}

	opts := madmin.DriveSpeedTestOpts{
		Serial:    serial,
		BlockSize: blockSize,
		FileSize:  fileSize,

	smallFileThreshold = 128 * humanize.KiByte // Optimized for NVMe/SSDs

	// For hardrives it is possible to set this to a lower value to avoid any
	// spike in latency. But currently we are simply keeping it optimal for SSDs.

	// bigFileThreshold is the point where we add readahead to put operations.
	bigFileThreshold = 128 * humanize.MiByte

	// XL metadata file carries per object metadata.

	fileSizeStr := r.Form.Get("filesize")

	blockSize, err := strconv.ParseUint(blockSizeStr, 10, 64)
	if err != nil {
		blockSize = 4 * humanize.MiByte // default value
	}

	fileSize, err := strconv.ParseUint(fileSizeStr, 10, 64)
	if err != nil {
		fileSize = 1 * humanize.GiByte // default value
	}

	opts := madmin.DriveSpeedTestOpts{
		Serial:    serial,
		BlockSize: blockSize,
		FileSize:  fileSize,

			objSize: 101 * humanize.MiByte,
			want:    false,
		},
		{
			filter:  fiLt,
			objSize: 99 * humanize.MiByte,
			want:    true,
		},
		{
			filter:  fiGt,
			objSize: 1*humanize.MiByte - 1,
			want:    false,
		},
		{
			filter:  fiGt,
			objSize: 1*humanize.MiByte + 1,
			want:    true,
		},
		{
			filter:  fiLtAndGt,
			objSize: 1*humanize.MiByte - 1,
			want:    false,

	}

	testCases := []struct {
		offset         int64
		expectedIndex  int
		expectedOffset int64
		expectedErr    error
	}{
		{0, 0, 0, nil},
		{1 * humanize.MiByte, 0, 1 * humanize.MiByte, nil},
		{1 + humanize.MiByte, 1, 0, nil},
		{2 + humanize.MiByte, 1, 1, nil},
		// Its valid for zero sized object.

		// part size 2MiB, total size 4MiB
		{4 * humanize.MiByte, 2 * humanize.MiByte, 1, 2 * humanize.MiByte},
		{4 * humanize.MiByte, 2 * humanize.MiByte, 2, 2 * humanize.MiByte},
		{4 * humanize.MiByte, 2 * humanize.MiByte, 3, 0},
		// part size 2MiB, total size 5MiB
		{5 * humanize.MiByte, 2 * humanize.MiByte, 1, 2 * humanize.MiByte},
		{5 * humanize.MiByte, 2 * humanize.MiByte, 2, 2 * humanize.MiByte},