42 lines
1.5 KiB
JavaScript
42 lines
1.5 KiB
JavaScript
import { assertEmptyRest } from './assert.js'
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import { typedView } from './array.js'
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import { E_STRING } from './fallback/_utils.js'
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import * as js from './fallback/base32.js'
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// See https://datatracker.ietf.org/doc/html/rfc4648
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// 8 chars per 5 bytes
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const { E_PADDING } = js
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export const toBase32 = (arr, { padding = false } = {}) => js.toBase32(arr, false, padding)
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export const toBase32hex = (arr, { padding = false } = {}) => js.toBase32(arr, true, padding)
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// By default, valid padding is accepted but not required
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export function fromBase32(str, options) {
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if (!options) return fromBase32common(str, false, 'both', 'uint8', null)
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const { format = 'uint8', padding = 'both', ...rest } = options
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return fromBase32common(str, false, padding, format, rest)
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}
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export function fromBase32hex(str, options) {
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if (!options) return fromBase32common(str, true, 'both', 'uint8', null)
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const { format = 'uint8', padding = 'both', ...rest } = options
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return fromBase32common(str, true, padding, format, rest)
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}
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function fromBase32common(str, isBase32Hex, padding, format, rest) {
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if (typeof str !== 'string') throw new TypeError(E_STRING)
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if (rest !== null) assertEmptyRest(rest)
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if (padding === true) {
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if (str.length % 8 !== 0) throw new SyntaxError(E_PADDING)
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} else if (padding === false) {
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if (str.endsWith('=')) throw new SyntaxError('Did not expect padding in base32 input')
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} else if (padding !== 'both') {
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throw new TypeError('Invalid padding option')
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}
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return typedView(js.fromBase32(str, isBase32Hex), format)
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}
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