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86 lines
2.4 KiB
Go
86 lines
2.4 KiB
Go
package units
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// Base2Bytes is the old non-SI power-of-2 byte scale (1024 bytes in a kilobyte,
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// etc.).
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type Base2Bytes int64
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// Base-2 byte units.
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const (
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Kibibyte Base2Bytes = 1024
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KiB = Kibibyte
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Mebibyte = Kibibyte * 1024
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MiB = Mebibyte
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Gibibyte = Mebibyte * 1024
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GiB = Gibibyte
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Tebibyte = Gibibyte * 1024
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TiB = Tebibyte
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Pebibyte = Tebibyte * 1024
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PiB = Pebibyte
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Exbibyte = Pebibyte * 1024
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EiB = Exbibyte
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)
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var (
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bytesUnitMap = MakeUnitMap("iB", "B", 1024)
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oldBytesUnitMap = MakeUnitMap("B", "B", 1024)
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)
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// ParseBase2Bytes supports both iB and B in base-2 multipliers. That is, KB
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// and KiB are both 1024.
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// However "kB", which is the correct SI spelling of 1000 Bytes, is rejected.
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func ParseBase2Bytes(s string) (Base2Bytes, error) {
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n, err := ParseUnit(s, bytesUnitMap)
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if err != nil {
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n, err = ParseUnit(s, oldBytesUnitMap)
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}
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return Base2Bytes(n), err
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}
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func (b Base2Bytes) String() string {
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return ToString(int64(b), 1024, "iB", "B")
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}
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var (
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metricBytesUnitMap = MakeUnitMap("B", "B", 1000)
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)
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// MetricBytes are SI byte units (1000 bytes in a kilobyte).
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type MetricBytes SI
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// SI base-10 byte units.
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const (
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Kilobyte MetricBytes = 1000
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KB = Kilobyte
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Megabyte = Kilobyte * 1000
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MB = Megabyte
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Gigabyte = Megabyte * 1000
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GB = Gigabyte
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Terabyte = Gigabyte * 1000
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TB = Terabyte
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Petabyte = Terabyte * 1000
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PB = Petabyte
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Exabyte = Petabyte * 1000
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EB = Exabyte
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)
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// ParseMetricBytes parses base-10 metric byte units. That is, KB is 1000 bytes.
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func ParseMetricBytes(s string) (MetricBytes, error) {
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n, err := ParseUnit(s, metricBytesUnitMap)
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return MetricBytes(n), err
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}
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// TODO: represents 1000B as uppercase "KB", while SI standard requires "kB".
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func (m MetricBytes) String() string {
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return ToString(int64(m), 1000, "B", "B")
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}
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// ParseStrictBytes supports both iB and B suffixes for base 2 and metric,
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// respectively. That is, KiB represents 1024 and kB, KB represent 1000.
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func ParseStrictBytes(s string) (int64, error) {
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n, err := ParseUnit(s, bytesUnitMap)
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if err != nil {
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n, err = ParseUnit(s, metricBytesUnitMap)
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}
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return int64(n), err
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}
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