25 lines
613 B
TypeScript
25 lines
613 B
TypeScript
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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import type { Reader } from "../types.d.ts";
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/** Reader utility for combining multiple readers */
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export class MultiReader implements Reader {
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readonly #readers: Reader[];
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#currentIndex = 0;
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constructor(readers: Reader[]) {
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this.#readers = [...readers];
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}
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async read(p: Uint8Array): Promise<number | null> {
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const r = this.#readers[this.#currentIndex];
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if (!r) return null;
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const result = await r.read(p);
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if (result === null) {
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this.#currentIndex++;
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return 0;
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}
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return result;
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}
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}
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