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Go
at stack/acme
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import ( "fmt" "math" "strconv" "strings")
// ParseSI parses an integer written with an optional decimal SI suffix into its// full value: k/K = 1e3, M = 1e6, G = 1e9, T = 1e12. Suffixes are DECIMAL// (1k = 1000), matching bitrate/throughput convention — not binary (1 KiB).// A bare number is taken verbatim ("30000000"), a decimal mantissa is allowed// ("1.5M" => 1500000), surrounding/internal whitespace is ignored ("30 M"), and// an empty string is 0. Negative values and unknown suffixes are errors.//// It's the shared helper behind human-friendly bits- or bytes-valued flags// (e.g. --maximum-live-bitrate accepts "30M"); reuse it for future size flags.func ParseSI(s string) (int64, error) { s = strings.TrimSpace(s) if s == "" { return 0, nil } mult := int64(1) switch s[len(s)-1] { case 'k', 'K': mult = 1_000 case 'm', 'M': mult = 1_000_000 case 'g', 'G': mult = 1_000_000_000 case 't', 'T': mult = 1_000_000_000_000 } num := s if mult != 1 { num = strings.TrimSpace(s[:len(s)-1]) } f, err := strconv.ParseFloat(num, 64) if err != nil { return 0, fmt.Errorf("%q is not a number with an optional k/M/G/T suffix", s) } if f < 0 { return 0, fmt.Errorf("%q must not be negative", s) } return int64(math.Round(f * float64(mult))), nil}