109 lines
2.0 KiB
Go
109 lines
2.0 KiB
Go
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package bytes
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import (
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"fmt"
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"regexp"
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"strconv"
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)
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type (
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// Bytes struct
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Bytes struct{}
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)
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const (
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_ = 1.0 << (10 * iota) // ignore first value by assigning to blank identifier
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KB
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MB
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GB
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TB
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PB
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EB
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)
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var (
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pattern = regexp.MustCompile(`(?i)^(-?\d+(?:\.\d+)?)([KMGTPE]B?|B?)$`)
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global = New()
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)
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// New creates a Bytes instance.
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func New() *Bytes {
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return &Bytes{}
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}
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// Format formats bytes integer to human readable string.
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// For example, 31323 bytes will return 30.59KB.
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func (*Bytes) Format(b int64) string {
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multiple := ""
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value := float64(b)
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switch {
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case b >= EB:
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value /= EB
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multiple = "EB"
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case b >= PB:
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value /= PB
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multiple = "PB"
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case b >= TB:
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value /= TB
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multiple = "TB"
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case b >= GB:
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value /= GB
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multiple = "GB"
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case b >= MB:
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value /= MB
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multiple = "MB"
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case b >= KB:
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value /= KB
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multiple = "KB"
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case b == 0:
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return "0"
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default:
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return strconv.FormatInt(b, 10) + "B"
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}
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return fmt.Sprintf("%.2f%s", value, multiple)
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}
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// Parse parses human readable bytes string to bytes integer.
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// For example, 6GB (6G is also valid) will return 6442450944.
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func (*Bytes) Parse(value string) (i int64, err error) {
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parts := pattern.FindStringSubmatch(value)
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if len(parts) < 3 {
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return 0, fmt.Errorf("error parsing value=%s", value)
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}
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bytesString := parts[1]
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multiple := parts[2]
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bytes, err := strconv.ParseFloat(bytesString, 64)
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if err != nil {
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return
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}
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switch multiple {
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default:
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return int64(bytes), nil
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case "K", "KB":
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return int64(bytes * KB), nil
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case "M", "MB":
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return int64(bytes * MB), nil
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case "G", "GB":
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return int64(bytes * GB), nil
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case "T", "TB":
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return int64(bytes * TB), nil
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case "P", "PB":
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return int64(bytes * PB), nil
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case "E", "EB":
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return int64(bytes * EB), nil
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}
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}
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// Format wraps global Bytes's Format function.
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func Format(b int64) string {
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return global.Format(b)
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}
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// Parse wraps global Bytes's Parse function.
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func Parse(val string) (int64, error) {
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return global.Parse(val)
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}
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