24 lines
807 B
JavaScript
24 lines
807 B
JavaScript
import { assertUint8 } from './assert.js'
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import { isDeno, toBuf } from './fallback/_utils.js'
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import { isAsciiSuperset, multibyteDecoder } from './fallback/multi-byte.js'
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import { isAscii } from 'node:buffer'
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export function createMultibyteDecoder(encoding, loose = false) {
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const jsDecoder = multibyteDecoder(encoding, loose) // asserts
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let streaming = false
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const asciiSuperset = isAsciiSuperset(encoding)
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return (arr, stream = false) => {
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assertUint8(arr)
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if (!streaming) {
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if (arr.byteLength === 0) return ''
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if (asciiSuperset && isAscii(arr)) {
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if (isDeno) return toBuf(arr).toString()
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return toBuf(arr).latin1Slice(0, arr.byteLength) // .latin1Slice is faster than .asciiSlice
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}
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}
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streaming = stream
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return jsDecoder(arr, stream)
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}
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}
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