30 lines
1.3 KiB
JavaScript
30 lines
1.3 KiB
JavaScript
import { assertUint8 } from './assert.js'
|
|
import { typedView } from './array.js'
|
|
import { E_STRING } from './fallback/_utils.js'
|
|
import { E_HEX } from './fallback/hex.js'
|
|
|
|
if (Buffer.TYPED_ARRAY_SUPPORT) throw new Error('Unexpected Buffer polyfill')
|
|
|
|
const { toHex: webHex } = Uint8Array.prototype // Modern engines have this
|
|
const denoBug = Buffer.from('ag', 'hex').length > 0
|
|
|
|
export function toHex(arr) {
|
|
assertUint8(arr)
|
|
if (arr.length === 0) return ''
|
|
if (webHex && arr.toHex === webHex) return arr.toHex()
|
|
if (arr.constructor === Buffer && Buffer.isBuffer(arr)) return arr.hexSlice(0, arr.byteLength)
|
|
return Buffer.from(arr.buffer, arr.byteOffset, arr.byteLength).hexSlice(0, arr.byteLength)
|
|
}
|
|
|
|
// Unlike Buffer.from(), throws on invalid input
|
|
export const fromHex = Uint8Array.fromHex
|
|
? (str, format = 'uint8') => typedView(Uint8Array.fromHex(str), format)
|
|
: (str, format = 'uint8') => {
|
|
if (typeof str !== 'string') throw new TypeError(E_STRING)
|
|
if (str.length % 2 !== 0) throw new SyntaxError(E_HEX)
|
|
if (denoBug && /[^\dA-Fa-f]/.test(str)) throw new SyntaxError(E_HEX)
|
|
const buf = Buffer.from(str, 'hex') // will stop on first non-hex character, so we can just validate length
|
|
if (buf.length * 2 !== str.length) throw new SyntaxError(E_HEX)
|
|
return typedView(buf, format)
|
|
}
|