{"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
	}

	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 {

			return nil, 0, 0, err
		}
		var decryptSkip int64
		var seqNum uint32

		off, length = int64(0), oi.Size
		decOff, decLength := int64(0), actualSize
		if rs != nil {
			off, length, err = rs.GetOffsetLength(actualSize)
			if err != nil {
				return nil, 0, 0, err
			}
			decrypt := func(b []byte) ([]byte, error) {
				return b, nil
			}
			if isEncrypted {
				decrypt = func(b []byte) ([]byte, error) {

		writeCopyPartErr(ctx, w, partRangeErr, r.URL)
		return
	}

	// Get the object offset & length
	startOffset, length, err := rs.GetOffsetLength(actualPartSize)
	if err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	// maximum copy size for multipart objects in a single operation
	if isMaxObjectSize(length) {

		if err != nil {
			err = errObjectTampered
			return
		}
		sizes = []int64{int64(partSize)}
		decObjSize = sizes[0]
	}

	var off, length int64
	off, length, err = rs.GetOffsetLength(decObjSize)
	if err != nil {
		return
	}

	// At this point, we have:
	//
	// 1. the decrypted part sizes in `sizes` (single element for

	if crypto.SSEC.IsEncrypted(objInfo.UserDefined) && opts.ReplicationRequest {
		opts.NoDecryption = true
	}

	if objInfo.Size == 0 {
		if _, _, err := rs.GetOffsetLength(objInfo.Size); err != nil {
			// Make sure to return object info to provide extra information.
			return &GetObjectReader{
				ObjInfo: objInfo,
			}, err
		}

			rs, err = parseRequestRangeSpec(byteRange)
			if err != nil {
				t.Fatalf("Object: %s Case %d ByteRange: %s: Unexpected err: %v", object, i+1, byteRange, err)
			}
		}
		off, length, err = rs.GetOffsetLength(objectLength(oi))
		if err != nil {
			t.Fatalf("Object: %s Case %d ByteRange: %s: Unexpected err: %v", object, i+1, byteRange, err)
		}

		readers := []io.Reader{}
		cumulativeSum := int64(0)