38 lines
1.6 KiB
JavaScript
38 lines
1.6 KiB
JavaScript
import { assertU8, fromBuffer, fromUint8, E_STRING } from './fallback/_utils.js'
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import { E_HEX } from './fallback/hex.js'
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if (Buffer.TYPED_ARRAY_SUPPORT) throw new Error('Unexpected Buffer polyfill')
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const { toHex: webHex } = Uint8Array.prototype // Modern engines have this
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const denoBug = Buffer.from('ag', 'hex').length > 0
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export function toHex(arr) {
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assertU8(arr)
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if (arr.length === 0) return ''
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if (webHex && arr.toHex === webHex) return arr.toHex()
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if (arr.constructor === Buffer && Buffer.isBuffer(arr)) return arr.hexSlice(0, arr.byteLength)
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return Buffer.from(arr.buffer, arr.byteOffset, arr.byteLength).hexSlice(0, arr.byteLength)
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}
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// Unlike Buffer.from(), throws on invalid input
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export const fromHex = Uint8Array.fromHex
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? (str, format = 'uint8') => fromUint8(Uint8Array.fromHex(str), format)
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: (str, format = 'uint8') => {
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if (typeof str !== 'string') throw new TypeError(E_STRING)
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if (str.length % 2 !== 0) throw new SyntaxError(E_HEX)
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if (denoBug && /[^\dA-Fa-f]/.test(str)) throw new SyntaxError(E_HEX)
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// 64 bytes or less, in heap
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if (str.length <= 128) {
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const buf = Buffer.from(str, 'hex')
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if (buf.length * 2 !== str.length) throw new SyntaxError(E_HEX)
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return fromBuffer(buf, format)
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}
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const length = str.length / 2
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const buf = format === 'buffer' ? Buffer.allocUnsafe(length) : Buffer.allocUnsafeSlow(length) // avoid pooling
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const count = buf.hexWrite(str, 0, length)
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if (count !== length) throw new SyntaxError(E_HEX) // will stop on first non-hex character, so we can just validate length
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return fromBuffer(buf, format)
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}
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