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minio/pkgs/strbyteconv/strbyteconv.go

101 lines
2.3 KiB

/*
* Mini Object Storage, (C) 2014 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package strbyteconv
import (
"errors"
"fmt"
"regexp"
"strconv"
"strings"
)
const (
UNIT_BYTE = 1
UNIT_KILOBYTE = 1024 * UNIT_BYTE
UNIT_MEGABYTE = 1024 * UNIT_KILOBYTE
UNIT_GIGABYTE = 1024 * UNIT_MEGABYTE
UNIT_TERABYTE = 1024 * UNIT_GIGABYTE
)
func BytesToString(bytes uint64) string {
var unit string = "B"
var value uint64 = 0
switch {
case bytes >= UNIT_TERABYTE:
unit = "TB"
value = uint64(bytes / UNIT_TERABYTE)
case bytes >= UNIT_GIGABYTE:
unit = "GB"
value = uint64(bytes / UNIT_GIGABYTE)
case bytes >= UNIT_MEGABYTE:
unit = "MB"
value = uint64(bytes / UNIT_MEGABYTE)
case bytes >= UNIT_KILOBYTE:
unit = "KB"
value = uint64(bytes / UNIT_KILOBYTE)
case bytes < UNIT_KILOBYTE && bytes >= UNIT_BYTE:
unit = "B"
value = uint64(bytes / UNIT_BYTE)
}
return fmt.Sprintf("%d%s", value, unit)
}
func StringToBytes(s string) (uint64, error) {
var bytes uint64
var err error
bytes, err = strconv.ParseUint(s, 10, 64)
if err == nil {
return bytes, nil
}
stringPattern, err := regexp.Compile(`(?i)^(-?\d+)([BKMGT])B?$`)
if err != nil {
return 0, err
}
parts := stringPattern.FindStringSubmatch(strings.TrimSpace(s))
if len(parts) < 2 {
return 0, errors.New("Incorrect string format must be K,KB,M,MB,G,GB")
}
value, err := strconv.ParseUint(parts[1], 10, 0)
if err != nil || value < 1 {
return 0, err
}
unit := strings.ToUpper(parts[2])
switch unit {
case "T":
bytes = value * UNIT_TERABYTE
case "G":
bytes = value * UNIT_GIGABYTE
case "M":
bytes = value * UNIT_MEGABYTE
case "K":
bytes = value * UNIT_KILOBYTE
case "B":
bytes = value * UNIT_BYTE
default:
return 0, errors.New("Incorrect string format must be K,KB,M,MB,G,GB")
}
return bytes, nil
}