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add BytesSize in pkg/units

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Signed-off-by: Victor Vieux <vieux@docker.com>
This commit is contained in:
Victor Vieux 2014-10-14 03:54:32 +00:00
parent 63363f2d49
commit 16f6e4744a
2 changed files with 23 additions and 5 deletions
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18
units/size.go
View file

@ -32,18 +32,26 @@ var (
sizeRegex = regexp.MustCompile(`^(\d+)([kKmMgGtTpP])?[bB]?$`)
)
var unitAbbrs = [...]string{"B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"}
var decimapAbbrs = []string{"B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"}
var binaryAbbrs = []string{"B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB"}
// HumanSize returns a human-readable approximation of a size
// using SI standard (eg. "44kB", "17MB")
func HumanSize(size int64) string {
return intToString(float64(size), 1000.0, decimapAbbrs)
}
func BytesSize(size float64) string {
return intToString(size, 1024.0, binaryAbbrs)
}
func intToString(size, unit float64, _map []string) string {
i := 0
sizef := float64(size)
for sizef >= 1000.0 {
sizef = sizef / 1000.0
for size >= unit {
size = size / unit
i++
}
return fmt.Sprintf("%.4g %s", sizef, unitAbbrs[i])
return fmt.Sprintf("%.4g %s", size, _map[i])
}
// FromHumanSize returns an integer from a human-readable specification of a

10
units/size_test.go
View file

@ -7,6 +7,16 @@ import (
"testing"
)
func TestBytesSize(t *testing.T) {
assertEquals(t, "1 KiB", BytesSize(1024))
assertEquals(t, "1 MiB", BytesSize(1024*1024))
assertEquals(t, "1 MiB", BytesSize(1048576))
assertEquals(t, "2 MiB", BytesSize(2*MiB))
assertEquals(t, "3.42 GiB", BytesSize(3.42*GiB))
assertEquals(t, "5.372 TiB", BytesSize(5.372*TiB))
assertEquals(t, "2.22 PiB", BytesSize(2.22*PiB))
}
func TestHumanSize(t *testing.T) {
assertEquals(t, "1 kB", HumanSize(1000))
assertEquals(t, "1.024 kB", HumanSize(1024))