added some helper functions

sizes/bibyte.go

@@ -16,6 +16,15 @@ package sizes
    limitations under the License.
 */
 
+import (
+	"errors"
+	"math"
+)
+
+var (
+	ErrUnfit = errors.New("cannot fit into integer")
+)
+
 func (b BiByteUnit) AsByte() ByteUnit {
 	return ByteUnit(b)
 }
@@ -28,6 +37,27 @@ func (b BiByteUnit) AsBiByte() BiByteUnit {
 	return b
 }
 
+func (b BiByteUnit) Int() (int, error) {
+	if int64(b) > math.MaxInt || int64(b) < math.MinInt {
+		return 0, ErrUnfit
+	}
+
+	return int(b), nil
+}
+
+func (b BiByteUnit) MustInt() int {
+	var (
+		result int
+		err    error
+	)
+
+	if result, err = b.Int(); err != nil {
+		panic(err)
+	}
+
+	return result
+}
+
 func (b BiByteUnit) Kibi() float64 {
 	return float64(b / KibiByte)
 }

sizes/byte.go

@@ -16,6 +16,8 @@ package sizes
    limitations under the License.
 */
 
+import "math"
+
 func (b ByteUnit) AsByte() ByteUnit {
 	return b
 }
@@ -28,6 +30,27 @@ func (b ByteUnit) AsBiByte() BiByteUnit {
 	return BiByteUnit(b)
 }
 
+func (b ByteUnit) Int() (int, error) {
+	if int64(b) > math.MaxInt || int64(b) < math.MinInt {
+		return 0, ErrUnfit
+	}
+
+	return int(b), nil
+}
+
+func (b ByteUnit) MustInt() int {
+	var (
+		result int
+		err    error
+	)
+
+	if result, err = b.Int(); err != nil {
+		panic(err)
+	}
+
+	return result
+}
+
 func (b ByteUnit) Kilo() float64 {
 	return float64(b / KiloByte)
 }