-
Notifications
You must be signed in to change notification settings - Fork 10
/
u256.js
69 lines (56 loc) · 1.4 KB
/
u256.js
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
const BN = require('bn.js')
const ethUtil = require('ethereumjs-util')
module.exports = class U256 {
constructor (value) {
// bn.js still doesn't support hex prefixes...
if ((typeof value === 'string') && ethUtil.isHexPrefixed(value)) {
this._value = new BN(ethUtil.stripHexPrefix(value), 16)
} else {
this._value = new BN(value, 10)
}
}
// This assumes Uint8Array in LSB (WASM code)
static fromMemory (value) {
return new U256(new BN(value, 16, 'be'))
}
// This assumes Uint8Array in LSB (WASM code)
toMemory (width) {
return this._value.toBuffer('be', width || 32)
}
toString (radix = 10) {
if (radix === 16) {
return '0x' + this._value.toString(16)
}
return this._value.toString(radix)
}
toBuffer (width = 32) {
if (width <= 0 || width > 32) {
throw new Error('Invalid U256 width')
}
return this._value.toBuffer('be', width)
}
toArray () {
return [...this.toBuffer()]
}
isZero () {
return this._value.isZero()
}
sub (u256) {
return new U256(this._value.sub(u256._value))
}
add (u256) {
return new U256(this._value.add(u256._value))
}
mul (u256) {
return new U256(this._value.mul(u256._value))
}
div (u256) {
return new U256(this._value.div(u256._value))
}
lt (u256) {
return this._value.lt(u256._value)
}
gt (u256) {
return this._value.gt(u256._value)
}
}