byte_conversions.go

/**
This file is part of s3explorer.

s3explorer is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

s3explorer is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with s3explorer.  If not, see <https://www.gnu.org/licenses/>.
**/

package main

import (
	"log"
	"math"
	"strconv"
)

func RoundUp(input float64, places int) (newVal float64) {
	var round float64
	pow := math.Pow(10, float64(places))
	digit := pow * input
	round = math.Ceil(digit)
	newVal = round / pow
	return
}

func ByteFormat(inputNum float64, precision int) string {

	log.Printf("Formatting input %v to human readable with precision %v\n", inputNum, precision)

	if precision <= 0 {
		precision = 1
	}

	var unit string
	var returnVal float64

	if inputNum >= 1000000000000000000000000 {
		returnVal = RoundUp((inputNum / 1208925819614629174706176), precision)
		unit = " YB" // yottabyte
	} else if inputNum >= 1000000000000000000000 {
		returnVal = RoundUp((inputNum / 1180591620717411303424), precision)
		unit = " ZB" // zettabyte
	} else if inputNum >= 10000000000000000000 {
		returnVal = RoundUp((inputNum / 1152921504606846976), precision)
		unit = " EB" // exabyte
	} else if inputNum >= 1000000000000000 {
		returnVal = RoundUp((inputNum / 1125899906842624), precision)
		unit = " PB" // petabyte
	} else if inputNum >= 1000000000000 {
		returnVal = RoundUp((inputNum / 1099511627776), precision)
		unit = " TB" // terrabyte
	} else if inputNum >= 1000000000 {
		returnVal = RoundUp((inputNum / 1073741824), precision)
		unit = " GB" // gigabyte
	} else if inputNum >= 1000000 {
		returnVal = RoundUp((inputNum / 1048576), precision)
		unit = " MB" // megabyte
	} else if inputNum >= 1000 {
		returnVal = RoundUp((inputNum / 1024), precision)
		unit = " KB" // kilobyte
	} else {
		returnVal = inputNum
		unit = " B" // byte
	}

	return strconv.FormatFloat(returnVal, 'f', precision, 64) + unit

}