18 lines
553 B
JavaScript
18 lines
553 B
JavaScript
import { assertTypedArray } from './assert.js'
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const { Buffer } = globalThis // Buffer is optional
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export function typedView(arr, format) {
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assertTypedArray(arr)
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switch (format) {
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case 'uint8':
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if (arr.constructor === Uint8Array) return arr // fast path
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return new Uint8Array(arr.buffer, arr.byteOffset, arr.byteLength)
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case 'buffer':
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if (arr.constructor === Buffer && Buffer.isBuffer(arr)) return arr
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return Buffer.from(arr.buffer, arr.byteOffset, arr.byteLength)
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}
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throw new TypeError('Unexpected format')
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}
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