|  | @@ -8,6 +8,7 @@ import (
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				|  |  |  	"crypto/md5"
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				|  |  |  	"encoding/hex"
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				|  |  |  	"fmt"
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				|  |  | +	"math"
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				|  |  |  	"strings"
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				|  |  |  	"time"
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				|  |  |  )
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				|  | @@ -80,6 +81,51 @@ func TimeSince(then time.Time) string {
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				|  |  |  	return then.String()
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				|  |  |  }
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				|  |  |  
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				|  |  | +const (
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				|  |  | +	Byte  = 1
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				|  |  | +	KByte = Byte * 1024
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				|  |  | +	MByte = KByte * 1024
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				|  |  | +	GByte = MByte * 1024
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				|  |  | +	TByte = GByte * 1024
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				|  |  | +	PByte = TByte * 1024
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				|  |  | +	EByte = PByte * 1024
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				|  |  | +)
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				|  |  | +
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				|  |  | +var bytesSizeTable = map[string]uint64{
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				|  |  | +	"b":  Byte,
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				|  |  | +	"kb": KByte,
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				|  |  | +	"mb": MByte,
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				|  |  | +	"gb": GByte,
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				|  |  | +	"tb": TByte,
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				|  |  | +	"pb": PByte,
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				|  |  | +	"eb": EByte,
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				|  |  | +}
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				|  |  | +
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				|  |  | +func logn(n, b float64) float64 {
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				|  |  | +	return math.Log(n) / math.Log(b)
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				|  |  | +}
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				|  |  | +
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				|  |  | +func humanateBytes(s uint64, base float64, sizes []string) string {
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				|  |  | +	if s < 10 {
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				|  |  | +		return fmt.Sprintf("%dB", s)
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				|  |  | +	}
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				|  |  | +	e := math.Floor(logn(float64(s), base))
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				|  |  | +	suffix := sizes[int(e)]
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				|  |  | +	val := float64(s) / math.Pow(base, math.Floor(e))
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				|  |  | +	f := "%.0f"
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				|  |  | +	if val < 10 {
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				|  |  | +		f = "%.1f"
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				|  |  | +	}
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				|  |  | +
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				|  |  | +	return fmt.Sprintf(f+"%s", val, suffix)
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				|  |  | +}
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				|  |  | +
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				|  |  | +// FileSize calculates the file size and generate user-friendly string.
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				|  |  | +func FileSize(s int64) string {
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				|  |  | +	sizes := []string{"B", "KB", "MB", "GB", "TB", "PB", "EB"}
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				|  |  | +	return humanateBytes(uint64(s), 1024, sizes)
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				|  |  | +}
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				|  |  | +
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				|  |  |  // Subtract deals with subtraction of all types of number.
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				|  |  |  func Subtract(left interface{}, right interface{}) interface{} {
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				|  |  |  	var rleft, rright int64
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