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