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