36 lines
991 B
JavaScript
36 lines
991 B
JavaScript
import { assertTypedArray } from './assert.js'
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const Buffer = globalThis.Buffer // 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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export function typedCopyBytes(arr, format) {
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assertTypedArray(arr)
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if (!(arr instanceof Uint8Array)) {
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arr = new Uint8Array(arr.buffer, arr.byteOffset, arr.byteLength)
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}
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switch (format) {
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case 'uint8':
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return Uint8Array.from(arr) // never pooled
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case 'buffer':
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return Buffer.from(arr)
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case 'arraybuffer':
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return Uint8Array.from(arr).buffer
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}
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throw new TypeError('Unexpected format')
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}
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