{"bytes=-1000", 0, 10},
	}
	for i, testCase := range validRangeSpecs {
		rs, err := parseRequestRangeSpec(testCase.spec)
		if err != nil {
			t.Errorf("unexpected err: %v", err)
		}
		o, l, err := rs.GetOffsetLength(resourceSize)
		if err != nil {
			t.Errorf("unexpected err: %v", err)
		}
		if o != testCase.expOffset || l != testCase.expLength {
			t.Errorf("Case %d: got bad offset/length: %d,%d expected: %d,%d",

	default:
		return 0, errors.New("Unexpected range specification case")
	}

	return rangeLength, nil
}

// GetOffsetLength computes the start offset and length of the range
// given the size of the resource
func (h *HTTPRangeSpec) GetOffsetLength(resourceSize int64) (start, length int64, err error) {
	if h == nil {
		// No range specified, implies whole object.
		return 0, resourceSize, nil
	}

	for _, successCase := range successCases {
		rs, err := parseCopyPartRangeSpec(successCase.rangeString)
		if err != nil {
			t.Fatalf("expected: <nil>, got: %s", err)
		}

		start, length, err1 := rs.GetOffsetLength(objectSize)
		if err1 != nil {
			t.Fatalf("expected: <nil>, got: %s", err1)
		}

		if start != successCase.offsetBegin {
			t.Fatalf("expected: %d, got: %d", successCase.offsetBegin, start)
		}

	default:
		return nil, errFileNotFound
	}

	etag := getMD5Hash(buf)
	r := bytes.NewReader(buf)

	off, length := int64(0), r.Size()
	if rs != nil {
		off, length, err = rs.GetOffsetLength(r.Size())
		if err != nil {
			return nil, err
		}
	}
	r.Seek(off, io.SeekStart)

	return NewGetObjectReaderFromReader(io.LimitReader(r, length), ObjectInfo{
		Bucket:      bucket,

	if err != nil {
		return err
	}

	if rs == nil && opts.PartNumber > 0 {
		rs = partNumberToRangeSpec(objInfo, opts.PartNumber)
	}

	// For providing ranged content
	start, rangeLen, err = rs.GetOffsetLength(totalObjectSize)
	if err != nil {
		return err
	}

	// Set content length.
	w.Header().Set(xhttp.ContentLength, strconv.FormatInt(rangeLen, 10))
	if rs != nil {