}

        if (size >= 0L && progressedSize != size) {
            ScaleUnit unit = ScaleUnit.getScaleUnit(size);
            format(builder, progressedSize, unit, true);
            builder.append("/");
            format(builder, size, unit, false);
        } else {
            ScaleUnit unit = ScaleUnit.getScaleUnit(progressedSize);

            format(builder, progressedSize, unit, false);
        }
    }

        }

        if (size >= 0L && progressedSize != size) {
            ScaleUnit unit = ScaleUnit.getScaleUnit(size);
            format(builder, progressedSize, unit, true);
            builder.append("/");
            format(builder, size, unit, false);
        } else {
            ScaleUnit unit = ScaleUnit.getScaleUnit(progressedSize);

            format(builder, progressedSize, unit, false);
        }
    }

                    return "GB";
                }
            };

            public abstract long bytes();

            public abstract String symbol();

            public static ScaleUnit getScaleUnit(long size) {
                if (size < 0L) {
                    throw new IllegalArgumentException("file size cannot be negative: " + size);
                }

                if (size >= GIGABYTE.bytes()) {