n -= int(extraBytes)
		if n < 0 {
			n = 0
		}
		err = io.EOF
	}
	return n, err
}

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

	if err != nil {
		return 0, nil, err
	}
	defer func() {
		if err != nil && obj != nil {
			obj.Close()
		}
	}()

	_, err = obj.Seek(offset, io.SeekStart)
	if err != nil {
		return 0, nil, err
	}

	info, err := obj.Stat()
	if err != nil {
		return 0, nil, err
	}
	n = info.Size - offset
	return n, obj, nil
}

	return newBytesRSC([]byte(s))
}

func newBytesRSC(b []byte) io.ReadSeekCloser {
	r := bytes.NewReader(b)
	segmentReader := func(offset int64) (io.ReadCloser, error) {
		_, err := r.Seek(offset, io.SeekStart)
		if err != nil {
			return nil, err
		}
		return io.NopCloser(r), nil
	}
	return NewObjectReadSeekCloser(segmentReader, int64(len(b)))
}

type testResponseWriter struct {
	statusCode int

		// Expected size cannot be satisfied for
		// requested offset and length
		file.Close()
		return nil, errFileCorrupt
	}

	if offset > 0 {
		if _, err = file.Seek(offset, io.SeekStart); err != nil {
			file.Close()
			return nil, err
		}
	}
	return &sendFileReader{Reader: io.LimitReader(file, length), Closer: file}, nil
}

// CreateFile - creates the file.