nextOffset int64
	m          sync.Mutex
}

func (w *writerAt) WriteAt(b []byte, offset int64) (n int, err error) {
	w.m.Lock()
	defer w.m.Unlock()

	if w.nextOffset == offset {
		n, err = w.w.Write(b)
		w.nextOffset += int64(n)
	} else {
		w.buffer[offset] = make([]byte, len(b))
		copy(w.buffer[offset], b)
		n = len(b)
	}

again:
	nextOut, ok := w.buffer[w.nextOffset]
	if ok {

	ReadFile(ctx context.Context, volume string, path string, offset int64, buf []byte, verifier *BitrotVerifier) (n int64, err error)
	AppendFile(ctx context.Context, volume string, path string, buf []byte) (err error)
	CreateFile(ctx context.Context, origvolume, olume, path string, size int64, reader io.Reader) error
	ReadFileStream(ctx context.Context, volume, path string, offset, length int64) (io.ReadCloser, error)

	storageRESTSrcVolume     = "source-volume"
	storageRESTSrcPath       = "source-path"
	storageRESTDstVolume     = "destination-volume"
	storageRESTDstPath       = "destination-path"
	storageRESTOffset        = "offset"
	storageRESTLength        = "length"
	storageRESTCount         = "count"
	storageRESTBitrotAlgo    = "bitrot-algo"
	storageRESTBitrotHash    = "bitrot-hash"
	storageRESTDiskID        = "disk-id"

		// There may be number of header bytes before the content.
		// Reading 64K extra. This should more than cover name and any "extra" details.
		end := file.Offset + int64(file.CompressedSize64) + 64<<10
		if end > zipObjInfo.Size {
			end = zipObjInfo.Size
		}
		rs := &HTTPRangeSpec{Start: file.Offset, End: end}
		gr, err := objectAPI.GetObjectNInfo(ctx, bucket, zipPath, rs, nil, opts)
		if err != nil {

		`|(?P<Timeword>(?i)\b(?:YEAR|MONTH|DAY|HOUR|MINUTE|SECOND|TIMEZONE_HOUR|TIMEZONE_MINUTE)\b)` +

	}
	return
}

func (d *DummyDataGen) Seek(offset int64, whence int) (int64, error) {
	switch whence {
	case io.SeekStart:
		if offset < 0 {
			return 0, errors.New("Invalid offset")
		}
		d.idx = offset
	case io.SeekCurrent:
		if d.idx+offset < 0 {
			return 0, errors.New("Invalid offset")
		}
		d.idx += offset
	case io.SeekEnd:
		if d.length+offset < 0 {
			return 0, errors.New("Invalid offset")
		}

func (cr *s3UnsignedChunkedReader) Read(buf []byte) (n int, err error) {
	// First, if there is any unread data, copy it to the client
	// provided buffer.
	if cr.offset > 0 {
		n = copy(buf, cr.buffer[cr.offset:])
		if n == len(buf) {
			cr.offset += n
			return n, nil
		}
		cr.offset = 0
		buf = buf[n:]
	}
	// mustRead reads from input and compares against provided slice.
	mustRead := func(b ...byte) error {
		for _, want := range b {

		{(1 + 2 + 4 + 5 + 7) + (5 * humanize.MiByte) - 1, 4, 1048582, nil},
		// Error if offset is size.
		{(1 + 2 + 4 + 5 + 7) + (5 * humanize.MiByte), 0, 0, InvalidRange{}},
	}

	// Test them.
	for _, testCase := range testCases {
		index, offset, err := fi.ObjectToPartOffset(context.Background(), testCase.offset)
		if err != testCase.expectedErr {

// Case 3: bytes=10- (absolute start offset with end offset unspecified) -> RangeSpec{false, 10, -1}
// Case 4: bytes=-30 (suffix length specification) -> RangeSpec{true, -30, -1}
type HTTPRangeSpec struct {
	// Does the range spec refer to a suffix of the object?
	IsSuffixLength bool

	// Start and end offset specified in range spec
	Start, End int64
}

// GetLength - get length of range

	{file: "myobject", offset: 100, length: 0, algorithm: SHA256, expError: nil},                // 3
	{file: "myobject", offset: 1, length: 120, algorithm: SHA256, expError: errFileCorrupt},     // 4
	{file: "myobject", offset: 3, length: 1100, algorithm: SHA256, expError: nil},               // 5
	{file: "myobject", offset: 2, length: 100, algorithm: SHA256, expError: errFileCorrupt},     // 6