-
Notifications
You must be signed in to change notification settings - Fork 0
/
index.html
204 lines (177 loc) · 4.97 KB
/
index.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Linux Kernel GENMASK Calculator</title>
<style type="text/css">
input {
width: 4em;
font-family: monospace;
}
form {
font-family: monospace;
}
.error {
color: red;
}
</style>
</head>
<body>
<h2>GENMASK</h2>
<form name="genmask" data-bits="32">
GENMASK(
h=<input name="h" type="number" placeholder="h" value="0" min="0">,
l=<input name="l" type="number" placeholder="l" value="0" min="0">
)
= <input placeholder="0x0" name="hex" style="width: 10em;">
= <input placeholder="0b0" name="bin" style="width: 30em;">
<div class="error"></div>
</form>
<h2>GENMASK_ULL</h2>
<form name="genmask_ull" data-bits="64">
GENMASK(
h=<input name="h" type="number" placeholder="h" value="0" min="0">,
l=<input name="l" type="number" placeholder="l" value="0" min="0">
)
= <input placeholder="0x0" name="hex" style="width: 15em;">
= <input placeholder="0b0" name="bin" style="width: 50em">
<div class="error"></div>
</form>
<script type="text/javascript">
document.querySelectorAll('form').forEach(form => {
const bits = parseInt(form.dataset.bits)
const inputs = {
'h': form.querySelector('[name=h]'),
'l': form.querySelector('[name=l]'),
'hex': form.querySelector('[name=hex]'),
'bin': form.querySelector('[name=bin]'),
}
for(const k in inputs) {
const input = inputs[k];
input.addEventListener('change', () => {
updateAndValidate(form, inputs, bits, k)
})
}
updateAndValidate(form, inputs, bits, 'h')
})
function updateAndValidate(form, inputs, bits, changedInput, newValue) {
switch(changedInput) {
case 'h':
case 'l': {
const newMask = maskFromHL(inputs.h.value, inputs.l.value, bits)
if(handleError(form, newMask.error)) {
inputs.hex.value = inputs.bin.value = ''
break
}
inputs.hex.value = maskToHex(newMask, bits)
inputs.bin.value = maskToBin(newMask, bits)
break
}
case 'hex': {
const newMask = maskFromHex(inputs.hex.value, bits)
if(handleError(form, newMask.error)) {
inputs.h.value = inputs.l.value = inputs.bin.value = ''
break
}
inputs.h.value = maskToH(newMask)
inputs.l.value = maskToL(newMask)
inputs.bin.value = maskToBin(newMask, bits)
break
}
case 'bin': {
const newMask = maskFromBin(inputs.bin.value, bits)
if(handleError(form, newMask.error)) {
inputs.h.value = inputs.l.value = inputs.hex.value = ''
break
}
inputs.h.value = maskToH(newMask)
inputs.l.value = maskToL(newMask)
inputs.hex.value = maskToHex(newMask, bits)
break
}
}
function maskFromHL(ht, lt, bits) {
const
h = parseInt(ht || 0),
l = parseInt(lt || 0)
if(l < 0) return {error: 'l < 0'}
if(h < 0) return {error: 'h < 0'}
if(h >= bits) return {error: 'h >= bits ('+bits+')'}
if(l > h) return {error: 'l > h'}
return {h: h, l: l}
}
function maskFromHex(hex, bits) {
hex = hex.replaceAll(' ', '')
if(!hex.startsWith('0x')) {
hex = '0x' + hex
}
const int = BigInt(hex)
const bin = int.toString(2)
return maskFromBin(bin, bits)
}
function maskFromBin(bin, bits) {
if(bin.startsWith('0b')) {
bin = bin.substr(2)
}
bin = bin.replaceAll(' ', '')
bin = bin.padStart(bits, '0')
let l = 0
while(bin[bin.length-1] == '0') {
bin = bin.substring(0, bin.length-1)
l++
}
if(l >= bits) {
return {error: 'no bits set'}
}
let h = l - 1
while(bin[bin.length-1] == '1') {
bin = bin.substring(0, bin.length-1)
h++
}
while(bin.length > 0) {
if(bin[0] != '0' && bin[0] != '1') {
return {error: 'unexpected character in binary string'}
}
if(bin[0] != '0') {
return {error: 'bits form no continous island'}
}
bin = bin.substring(1)
}
return {h: h, l: l}
}
function maskToHex(mask, bits) {
const int = BigInt('0b'+maskToBits(mask, bits))
const hex = int.toString(16).padStart(bits / 4, '0')
return '0x' + formatChunks(hex)
}
function maskToBits(mask, bits) {
const
zeros_before = bits - mask.h - 1,
ones = mask.h - mask.l + 1,
zeros_after = mask.l
return '0'.repeat(zeros_before) + '1'.repeat(ones) + '0'.repeat(zeros_after)
}
function maskToBin(mask, bits) {
return '0b' + formatChunks(maskToBits(mask, bits))
}
function maskToH(mask) { return mask.h }
function maskToL(mask) { return mask.l }
function chunk(str, size) {
const numChunks = Math.ceil(str.length / size)
const chunks = new Array(numChunks)
for (let i = 0, o = 0; i < numChunks; ++i, o += size) {
chunks[i] = str.substr(o, size)
}
return chunks
}
function formatChunks(str) {
return chunk(str, 4).join(' ')
}
function handleError(form, error) {
form.querySelector('.error').innerText = error ? error : ''
return error != undefined
}
}
</script>
</body>
</html>