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54 lines
1.5 KiB
TypeScript
54 lines
1.5 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import { intoCallbackAPIWithIntercept, MaybeEmpty } from "../_utils.ts";
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import { getEncoding, FileOptions } from "./_fs_common.ts";
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import { Buffer } from "../buffer.ts";
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import { fromFileUrl } from "../path.ts";
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const { readFile: denoReadFile, readFileSync: denoReadFileSync } = Deno;
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type ReadFileCallback = (
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err: MaybeEmpty<Error>,
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data: MaybeEmpty<string | Buffer>
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) => void;
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function maybeDecode(
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data: Uint8Array,
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encoding: string | null
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): string | Buffer {
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const buffer = new Buffer(data.buffer, data.byteOffset, data.byteLength);
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if (encoding) return buffer.toString(encoding);
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return buffer;
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}
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export function readFile(
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path: string | URL,
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optOrCallback: ReadFileCallback | FileOptions | string | undefined,
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callback?: ReadFileCallback
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): void {
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path = path instanceof URL ? fromFileUrl(path) : path;
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let cb: ReadFileCallback | undefined;
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if (typeof optOrCallback === "function") {
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cb = optOrCallback;
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} else {
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cb = callback;
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}
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const encoding = getEncoding(optOrCallback);
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intoCallbackAPIWithIntercept<Uint8Array, string | Buffer>(
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denoReadFile,
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(data: Uint8Array): string | Buffer => maybeDecode(data, encoding),
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cb,
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path
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);
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}
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export function readFileSync(
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path: string | URL,
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opt?: FileOptions | string
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): string | Buffer {
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path = path instanceof URL ? fromFileUrl(path) : path;
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return maybeDecode(denoReadFileSync(path), getEncoding(opt));
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}
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