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