You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
117 lines
2.5 KiB
117 lines
2.5 KiB
/*
|
|
* Minio Cloud Storage, (C) 2016 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 main
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
"strconv"
|
|
"strings"
|
|
"unicode"
|
|
)
|
|
|
|
// IEC Sizes, kibis of bits
|
|
const (
|
|
Byte = 1 << (iota * 10)
|
|
KiByte
|
|
MiByte
|
|
GiByte
|
|
TiByte
|
|
PiByte
|
|
EiByte
|
|
)
|
|
|
|
// Scientific notation Sizes.
|
|
const (
|
|
IByte = 1
|
|
KByte = IByte * 1000
|
|
MByte = KByte * 1000
|
|
GByte = MByte * 1000
|
|
TByte = GByte * 1000
|
|
PByte = TByte * 1000
|
|
EByte = PByte * 1000
|
|
)
|
|
|
|
// This table represents both IEC and SI notations with their corresponding values.
|
|
var bytesSizeTable = map[string]uint64{
|
|
"b": Byte,
|
|
"kib": KiByte,
|
|
"kb": KByte,
|
|
"mib": MiByte,
|
|
"mb": MByte,
|
|
"gib": GiByte,
|
|
"gb": GByte,
|
|
"tib": TiByte,
|
|
"tb": TByte,
|
|
"pib": PiByte,
|
|
"pb": PByte,
|
|
"eib": EiByte,
|
|
"eb": EByte,
|
|
// Without suffix
|
|
"": Byte,
|
|
"ki": KiByte,
|
|
"k": KByte,
|
|
"mi": MiByte,
|
|
"m": MByte,
|
|
"gi": GiByte,
|
|
"g": GByte,
|
|
"ti": TiByte,
|
|
"t": TByte,
|
|
"pi": PiByte,
|
|
"p": PByte,
|
|
"ei": EiByte,
|
|
"e": EByte,
|
|
}
|
|
|
|
// strconvBytes parses a string representation of bytes into the number
|
|
// of bytes it represents.
|
|
//
|
|
// See Also: Bytes, IBytes.
|
|
//
|
|
// ParseBytes("42MB") -> 42000000, nil
|
|
// ParseBytes("42mib") -> 44040192, nil
|
|
func strconvBytes(s string) (uint64, error) {
|
|
lastDigit := 0
|
|
// Calculates the final integer value.
|
|
for _, r := range s {
|
|
// This supports decimals as well.
|
|
if !(unicode.IsDigit(r) || r == '.') {
|
|
break
|
|
}
|
|
lastDigit++
|
|
}
|
|
|
|
// Float parsing to deal with decimal inputs.
|
|
f, err := strconv.ParseFloat(s[:lastDigit], 64)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
// Fetch the corresponding byte size for notation.
|
|
byteSize := strings.ToLower(strings.TrimSpace(s[lastDigit:]))
|
|
size, ok := bytesSizeTable[byteSize]
|
|
if !ok {
|
|
return 0, fmt.Errorf("Unrecognized size notation name: %v", byteSize)
|
|
}
|
|
f *= float64(size)
|
|
// Return an error if final value overflows uint64 max.
|
|
if f >= math.MaxUint64 {
|
|
return 0, fmt.Errorf("too large: %v", s)
|
|
}
|
|
// Success.
|
|
return uint64(f), nil
|
|
}
|
|
|