1 |
|
2 |
|
3 | import { BigInt } from '@polkadot/x-bigint';
|
4 | import { objectSpread } from "../object/spread.js";
|
5 | import { _0n, _1n } from "./consts.js";
|
6 | import { nToBigInt } from "./toBigInt.js";
|
7 | const DIV = BigInt(256);
|
8 | const NEG_MASK = BigInt(0xff);
|
9 |
|
10 | function toU8a(value, {
|
11 | isLe,
|
12 | isNegative
|
13 | }) {
|
14 | const arr = [];
|
15 |
|
16 | if (isNegative) {
|
17 | value = (value + _1n) * -_1n;
|
18 | }
|
19 |
|
20 | while (value !== _0n) {
|
21 | const mod = value % DIV;
|
22 | const val = Number(isNegative ? mod ^ NEG_MASK : mod);
|
23 |
|
24 | if (isLe) {
|
25 | arr.push(val);
|
26 | } else {
|
27 | arr.unshift(val);
|
28 | }
|
29 |
|
30 | value = (value - mod) / DIV;
|
31 | }
|
32 |
|
33 | return Uint8Array.from(arr);
|
34 | }
|
35 |
|
36 |
|
37 |
|
38 |
|
39 |
|
40 |
|
41 | export function nToU8a(value, options) {
|
42 | const opts = objectSpread({
|
43 | bitLength: -1,
|
44 | isLe: true,
|
45 | isNegative: false
|
46 | }, options);
|
47 | const valueBi = nToBigInt(value);
|
48 |
|
49 | if (valueBi === _0n) {
|
50 | return opts.bitLength === -1 ? new Uint8Array() : new Uint8Array(Math.ceil((opts.bitLength || 0) / 8));
|
51 | }
|
52 |
|
53 | const u8a = toU8a(valueBi, opts);
|
54 |
|
55 | if (opts.bitLength === -1) {
|
56 | return u8a;
|
57 | }
|
58 |
|
59 | const byteLength = Math.ceil((opts.bitLength || 0) / 8);
|
60 | const output = new Uint8Array(byteLength);
|
61 |
|
62 | if (opts.isNegative) {
|
63 | output.fill(0xff);
|
64 | }
|
65 |
|
66 | output.set(u8a, opts.isLe ? 0 : byteLength - u8a.length);
|
67 | return output;
|
68 | } |
\ | No newline at end of file |