bigbytes.go raw
1 package humanize
2
3 import (
4 "fmt"
5 "math/big"
6 "strings"
7 "unicode"
8 )
9
10 var (
11 bigIECExp = big.NewInt(1024)
12
13 // BigByte is one byte in bit.Ints
14 BigByte = big.NewInt(1)
15 // BigKiByte is 1,024 bytes in bit.Ints
16 BigKiByte = (&big.Int{}).Mul(BigByte, bigIECExp)
17 // BigMiByte is 1,024 k bytes in bit.Ints
18 BigMiByte = (&big.Int{}).Mul(BigKiByte, bigIECExp)
19 // BigGiByte is 1,024 m bytes in bit.Ints
20 BigGiByte = (&big.Int{}).Mul(BigMiByte, bigIECExp)
21 // BigTiByte is 1,024 g bytes in bit.Ints
22 BigTiByte = (&big.Int{}).Mul(BigGiByte, bigIECExp)
23 // BigPiByte is 1,024 t bytes in bit.Ints
24 BigPiByte = (&big.Int{}).Mul(BigTiByte, bigIECExp)
25 // BigEiByte is 1,024 p bytes in bit.Ints
26 BigEiByte = (&big.Int{}).Mul(BigPiByte, bigIECExp)
27 // BigZiByte is 1,024 e bytes in bit.Ints
28 BigZiByte = (&big.Int{}).Mul(BigEiByte, bigIECExp)
29 // BigYiByte is 1,024 z bytes in bit.Ints
30 BigYiByte = (&big.Int{}).Mul(BigZiByte, bigIECExp)
31 // BigRiByte is 1,024 y bytes in bit.Ints
32 BigRiByte = (&big.Int{}).Mul(BigYiByte, bigIECExp)
33 // BigQiByte is 1,024 r bytes in bit.Ints
34 BigQiByte = (&big.Int{}).Mul(BigRiByte, bigIECExp)
35 )
36
37 var (
38 bigSIExp = big.NewInt(1000)
39
40 // BigSIByte is one SI byte in big.Ints
41 BigSIByte = big.NewInt(1)
42 // BigKByte is 1,000 SI bytes in big.Ints
43 BigKByte = (&big.Int{}).Mul(BigSIByte, bigSIExp)
44 // BigMByte is 1,000 SI k bytes in big.Ints
45 BigMByte = (&big.Int{}).Mul(BigKByte, bigSIExp)
46 // BigGByte is 1,000 SI m bytes in big.Ints
47 BigGByte = (&big.Int{}).Mul(BigMByte, bigSIExp)
48 // BigTByte is 1,000 SI g bytes in big.Ints
49 BigTByte = (&big.Int{}).Mul(BigGByte, bigSIExp)
50 // BigPByte is 1,000 SI t bytes in big.Ints
51 BigPByte = (&big.Int{}).Mul(BigTByte, bigSIExp)
52 // BigEByte is 1,000 SI p bytes in big.Ints
53 BigEByte = (&big.Int{}).Mul(BigPByte, bigSIExp)
54 // BigZByte is 1,000 SI e bytes in big.Ints
55 BigZByte = (&big.Int{}).Mul(BigEByte, bigSIExp)
56 // BigYByte is 1,000 SI z bytes in big.Ints
57 BigYByte = (&big.Int{}).Mul(BigZByte, bigSIExp)
58 // BigRByte is 1,000 SI y bytes in big.Ints
59 BigRByte = (&big.Int{}).Mul(BigYByte, bigSIExp)
60 // BigQByte is 1,000 SI r bytes in big.Ints
61 BigQByte = (&big.Int{}).Mul(BigRByte, bigSIExp)
62 )
63
64 var bigBytesSizeTable = map[string]*big.Int{
65 "b": BigByte,
66 "kib": BigKiByte,
67 "kb": BigKByte,
68 "mib": BigMiByte,
69 "mb": BigMByte,
70 "gib": BigGiByte,
71 "gb": BigGByte,
72 "tib": BigTiByte,
73 "tb": BigTByte,
74 "pib": BigPiByte,
75 "pb": BigPByte,
76 "eib": BigEiByte,
77 "eb": BigEByte,
78 "zib": BigZiByte,
79 "zb": BigZByte,
80 "yib": BigYiByte,
81 "yb": BigYByte,
82 "rib": BigRiByte,
83 "rb": BigRByte,
84 "qib": BigQiByte,
85 "qb": BigQByte,
86 // Without suffix
87 "": BigByte,
88 "ki": BigKiByte,
89 "k": BigKByte,
90 "mi": BigMiByte,
91 "m": BigMByte,
92 "gi": BigGiByte,
93 "g": BigGByte,
94 "ti": BigTiByte,
95 "t": BigTByte,
96 "pi": BigPiByte,
97 "p": BigPByte,
98 "ei": BigEiByte,
99 "e": BigEByte,
100 "z": BigZByte,
101 "zi": BigZiByte,
102 "y": BigYByte,
103 "yi": BigYiByte,
104 "r": BigRByte,
105 "ri": BigRiByte,
106 "q": BigQByte,
107 "qi": BigQiByte,
108 }
109
110 var ten = big.NewInt(10)
111
112 func humanateBigBytes(s, base *big.Int, sizes []string) string {
113 if s.Cmp(ten) < 0 {
114 return fmt.Sprintf("%d B", s)
115 }
116 c := (&big.Int{}).Set(s)
117 val, mag := oomm(c, base, len(sizes)-1)
118 suffix := sizes[mag]
119 f := "%.0f %s"
120 if val < 10 {
121 f = "%.1f %s"
122 }
123
124 return fmt.Sprintf(f, val, suffix)
125
126 }
127
128 // BigBytes produces a human readable representation of an SI size.
129 //
130 // See also: ParseBigBytes.
131 //
132 // BigBytes(82854982) -> 83 MB
133 func BigBytes(s *big.Int) string {
134 sizes := []string{"B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB", "RB", "QB"}
135 return humanateBigBytes(s, bigSIExp, sizes)
136 }
137
138 // BigIBytes produces a human readable representation of an IEC size.
139 //
140 // See also: ParseBigBytes.
141 //
142 // BigIBytes(82854982) -> 79 MiB
143 func BigIBytes(s *big.Int) string {
144 sizes := []string{"B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB", "RiB", "QiB"}
145 return humanateBigBytes(s, bigIECExp, sizes)
146 }
147
148 // ParseBigBytes parses a string representation of bytes into the number
149 // of bytes it represents.
150 //
151 // See also: BigBytes, BigIBytes.
152 //
153 // ParseBigBytes("42 MB") -> 42000000, nil
154 // ParseBigBytes("42 mib") -> 44040192, nil
155 func ParseBigBytes(s string) (*big.Int, error) {
156 lastDigit := 0
157 hasComma := false
158 for _, r := range s {
159 if !(unicode.IsDigit(r) || r == '.' || r == ',') {
160 break
161 }
162 if r == ',' {
163 hasComma = true
164 }
165 lastDigit++
166 }
167
168 num := s[:lastDigit]
169 if hasComma {
170 num = strings.Replace(num, ",", "", -1)
171 }
172
173 val := &big.Rat{}
174 _, err := fmt.Sscanf(num, "%f", val)
175 if err != nil {
176 return nil, err
177 }
178
179 extra := strings.ToLower(strings.TrimSpace(s[lastDigit:]))
180 if m, ok := bigBytesSizeTable[extra]; ok {
181 mv := (&big.Rat{}).SetInt(m)
182 val.Mul(val, mv)
183 rv := &big.Int{}
184 rv.Div(val.Num(), val.Denom())
185 return rv, nil
186 }
187
188 return nil, fmt.Errorf("unhandled size name: %v", extra)
189 }
190