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package humanize
import (
"fmt"
"math"
"strconv"
"strings"
"time"
"unicode"
"github.com/git-lfs/git-lfs/v3/errors"
"github.com/git-lfs/git-lfs/v3/tr"
)
const (
Byte = 1 << (iota * 10)
Kibibyte
Mebibyte
Gibibyte
Tebibyte
Pebibyte
Kilobyte = 1000 * Byte
Megabyte = 1000 * Kilobyte
Gigabyte = 1000 * Megabyte
Terabyte = 1000 * Gigabyte
Petabyte = 1000 * Terabyte
// eps is the machine epsilon, or a 64-bit floating point value
// reasonably close to zero.
eps float64 = 7.0/3 - 4.0/3 - 1.0
)
var bytesTable = map[string]uint64{
"": Byte,
"b": Byte,
"kib": Kibibyte,
"mib": Mebibyte,
"gib": Gibibyte,
"tib": Tebibyte,
"pib": Pebibyte,
"kb": Kilobyte,
"mb": Megabyte,
"gb": Gigabyte,
"tb": Terabyte,
"pb": Petabyte,
}
// ParseBytes parses a given human-readable bytes or ibytes string into a number
// of bytes, or an error if the string was unable to be parsed.
func ParseBytes(str string) (uint64, error) {
var sep int
for _, r := range str {
if !(unicode.IsDigit(r) || r == '.' || r == ',') {
break
}
sep = sep + 1
}
var f float64
if s := strings.Replace(str[:sep], ",", "", -1); len(s) > 0 {
var err error
f, err = strconv.ParseFloat(s, 64)
if err != nil {
return 0, err
}
}
m, err := ParseByteUnit(str[sep:])
if err != nil {
return 0, err
}
f = f * float64(m)
if f >= math.MaxUint64 {
return 0, errors.New(tr.Tr.Get("number of bytes too large"))
}
return uint64(f), nil
}
// ParseByteUnit returns the number of bytes in a given unit of storage, or an
// error, if that unit is unrecognized.
func ParseByteUnit(str string) (uint64, error) {
str = strings.TrimSpace(str)
str = strings.ToLower(str)
if u, ok := bytesTable[str]; ok {
return u, nil
}
return 0, errors.New(tr.Tr.Get("unknown unit: %q", str))
}
var sizes = []string{"B", "KB", "MB", "GB", "TB", "PB"}
// FormatBytes outputs the given number of bytes "s" as a human-readable string,
// rounding to the nearest half within .01.
func FormatBytes(s uint64) string {
var e float64
if s == 0 {
e = 0
} else {
e = math.Floor(log(float64(s), 1000))
}
unit := uint64(math.Pow(1000, e))
suffix := sizes[int(e)]
return fmt.Sprintf("%s %s",
FormatBytesUnit(s, unit), suffix)
}
// FormatBytesUnit outputs the given number of bytes "s" as a quantity of the
// given units "u" to the nearest half within .01.
func FormatBytesUnit(s, u uint64) string {
var rounded float64
if s < 10 {
rounded = float64(s)
} else {
rounded = math.Floor(float64(s)/float64(u)*10+.5) / 10
}
format := "%.0f"
if rounded < 10 && u > 1 {
format = "%.1f"
}
return fmt.Sprintf(format, rounded)
}
// FormatByteRate outputs the given rate of transfer "r" as the quotient of "s"
// (the number of bytes transferred) over "d" (the duration of time that those
// bytes were transferred in).
//
// It displays the output as a quantity of a "per-unit-time" unit (i.e., B/s,
// MiB/s) in the most representative fashion possible, as above.
func FormatByteRate(s uint64, d time.Duration) string {
// e is the index of the most representative unit of storage.
var e float64
// f is the floating-point equivalent of "s", so as to avoid more
// conversions than necessary.
f := float64(s)
if f != 0 {
f = f / math.Max(time.Nanosecond.Seconds(), d.Seconds())
e = math.Floor(log(f, 1000))
if e <= eps {
// The result of math.Floor(log(r, 1000)) can be
// "close-enough" to zero that it should be effectively
// considered zero.
e = 0
}
}
unit := uint64(math.Pow(1000, e))
suffix := sizes[int(e)]
return fmt.Sprintf("%s %s/s",
FormatBytesUnit(uint64(math.Ceil(f)), unit), suffix)
}
// log takes the log base "b" of "n" (\log_b{n})
func log(n, b float64) float64 {
return math.Log(n) / math.Log(b)
}
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