ethers.js/lib.esm/utils/base58.js
2022-09-15 22:58:45 -04:00

44 lines
1.2 KiB
JavaScript

import { getBytes } from "./data.js";
import { throwArgumentError } from "./errors.js";
import { toBigInt, toHex } from "./maths.js";
const Alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
let Lookup = null;
function getAlpha(letter) {
if (Lookup == null) {
Lookup = {};
for (let i = 0; i < Alphabet.length; i++) {
Lookup[Alphabet[i]] = BigInt(i);
}
}
const result = Lookup[letter];
if (result == null) {
throwArgumentError(`invalid base58 value`, "letter", letter);
}
return result;
}
const BN_0 = BigInt(0);
const BN_58 = BigInt(58);
/**
* Encode %%value%% as Base58-encoded data.
*/
export function encodeBase58(_value) {
let value = toBigInt(getBytes(_value));
let result = "";
while (value) {
result = Alphabet[Number(value % BN_58)] + result;
value /= BN_58;
}
return result;
}
/**
* Decode the Base58-encoded %%value%%.
*/
export function decodeBase58(value) {
let result = BN_0;
for (let i = 0; i < value.length; i++) {
result *= BN_58;
result += getAlpha(value[i]);
}
return getBytes(toHex(result));
}
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