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package units
// Base2Bytes is the old non-SI power-of-2 byte scale (1024 bytes in a kilobyte,
// etc.).
type Base2Bytes int64
// Base-2 byte units.
const (
Kibibyte Base2Bytes = 1024
KiB = Kibibyte
Mebibyte = Kibibyte * 1024
MiB = Mebibyte
Gibibyte = Mebibyte * 1024
GiB = Gibibyte
Tebibyte = Gibibyte * 1024
TiB = Tebibyte
Pebibyte = Tebibyte * 1024
PiB = Pebibyte
Exbibyte = Pebibyte * 1024
EiB = Exbibyte
)
var (
bytesUnitMap = MakeUnitMap("iB", "B", 1024)
oldBytesUnitMap = MakeUnitMap("B", "B", 1024)
)
// ParseBase2Bytes supports both iB and B in base-2 multipliers. That is, KB
// and KiB are both 1024.
// However "kB", which is the correct SI spelling of 1000 Bytes, is rejected.
func ParseBase2Bytes(s string) (Base2Bytes, error) {
n, err := ParseUnit(s, bytesUnitMap)
if err != nil {
n, err = ParseUnit(s, oldBytesUnitMap)
}
return Base2Bytes(n), err
}
func (b Base2Bytes) String() string {
return ToString(int64(b), 1024, "iB", "B")
}
// MarshalText implement encoding.TextMarshaler to process json/yaml.
func (b Base2Bytes) MarshalText() ([]byte, error) {
return []byte(b.String()), nil
}
// UnmarshalText implement encoding.TextUnmarshaler to process json/yaml.
func (b *Base2Bytes) UnmarshalText(text []byte) error {
n, err := ParseBase2Bytes(string(text))
*b = n
return err
}
// Floor returns Base2Bytes with all but the largest unit zeroed out. So that e.g. 1GiB1MiB1KiB → 1GiB.
func (b Base2Bytes) Floor() Base2Bytes {
switch {
case b > Exbibyte:
return (b / Exbibyte) * Exbibyte
case b > Pebibyte:
return (b / Pebibyte) * Pebibyte
case b > Tebibyte:
return (b / Tebibyte) * Tebibyte
case b > Gibibyte:
return (b / Gibibyte) * Gibibyte
case b > Mebibyte:
return (b / Mebibyte) * Mebibyte
case b > Kibibyte:
return (b / Kibibyte) * Kibibyte
default:
return b
}
}
// Round returns Base2Bytes with all but the first n units zeroed out. So that e.g. 1GiB1MiB1KiB → 1GiB1MiB, if n is 2.
func (b Base2Bytes) Round(n int) Base2Bytes {
idx := 0
switch {
case b > Exbibyte:
idx = n
case b > Pebibyte:
idx = n + 1
case b > Tebibyte:
idx = n + 2
case b > Gibibyte:
idx = n + 3
case b > Mebibyte:
idx = n + 4
case b > Kibibyte:
idx = n + 5
}
switch idx {
case 1:
return b - b%Exbibyte
case 2:
return b - b%Pebibyte
case 3:
return b - b%Tebibyte
case 4:
return b - b%Gibibyte
case 5:
return b - b%Mebibyte
case 6:
return b - b%Kibibyte
default:
return b
}
}
var metricBytesUnitMap = MakeUnitMap("B", "B", 1000)
// MetricBytes are SI byte units (1000 bytes in a kilobyte).
type MetricBytes SI
// SI base-10 byte units.
const (
Kilobyte MetricBytes = 1000
KB = Kilobyte
Megabyte = Kilobyte * 1000
MB = Megabyte
Gigabyte = Megabyte * 1000
GB = Gigabyte
Terabyte = Gigabyte * 1000
TB = Terabyte
Petabyte = Terabyte * 1000
PB = Petabyte
Exabyte = Petabyte * 1000
EB = Exabyte
)
// ParseMetricBytes parses base-10 metric byte units. That is, KB is 1000 bytes.
func ParseMetricBytes(s string) (MetricBytes, error) {
n, err := ParseUnit(s, metricBytesUnitMap)
return MetricBytes(n), err
}
// TODO: represents 1000B as uppercase "KB", while SI standard requires "kB".
func (m MetricBytes) String() string {
return ToString(int64(m), 1000, "B", "B")
}
// Floor returns MetricBytes with all but the largest unit zeroed out. So that e.g. 1GB1MB1KB → 1GB.
func (b MetricBytes) Floor() MetricBytes {
switch {
case b > Exabyte:
return (b / Exabyte) * Exabyte
case b > Petabyte:
return (b / Petabyte) * Petabyte
case b > Terabyte:
return (b / Terabyte) * Terabyte
case b > Gigabyte:
return (b / Gigabyte) * Gigabyte
case b > Megabyte:
return (b / Megabyte) * Megabyte
case b > Kilobyte:
return (b / Kilobyte) * Kilobyte
default:
return b
}
}
// Round returns MetricBytes with all but the first n units zeroed out. So that e.g. 1GB1MB1KB → 1GB1MB, if n is 2.
func (b MetricBytes) Round(n int) MetricBytes {
idx := 0
switch {
case b > Exabyte:
idx = n
case b > Petabyte:
idx = n + 1
case b > Terabyte:
idx = n + 2
case b > Gigabyte:
idx = n + 3
case b > Megabyte:
idx = n + 4
case b > Kilobyte:
idx = n + 5
}
switch idx {
case 1:
return b - b%Exabyte
case 2:
return b - b%Petabyte
case 3:
return b - b%Terabyte
case 4:
return b - b%Gigabyte
case 5:
return b - b%Megabyte
case 6:
return b - b%Kilobyte
default:
return b
}
}
// ParseStrictBytes supports both iB and B suffixes for base 2 and metric,
// respectively. That is, KiB represents 1024 and kB, KB represent 1000.
func ParseStrictBytes(s string) (int64, error) {
n, err := ParseUnit(s, bytesUnitMap)
if err != nil {
n, err = ParseUnit(s, metricBytesUnitMap)
}
return int64(n), err
}
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