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read_all.ts
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read_all.ts
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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
import { concat } from "../bytes/concat.ts";
import { DEFAULT_CHUNK_SIZE } from "./_constants.ts";
import type { Reader, ReaderSync } from "./types.ts";
/**
* Read {@linkcode Reader} `r` until EOF (`null`) and resolve to the content as
* {@linkcode Uint8Array}.
*
* @example
* ```ts
* import { readAll } from "https://deno.land/std@$STD_VERSION/io/read_all.ts";
*
* // Example from stdin
* const stdinContent = await readAll(Deno.stdin);
*
* // Example from file
* using file = await Deno.open("my_file.txt", {read: true});
* const myFileContent = await readAll(file);
* ```
*/
export async function readAll(reader: Reader): Promise<Uint8Array> {
const chunks: Uint8Array[] = [];
while (true) {
let chunk = new Uint8Array(DEFAULT_CHUNK_SIZE);
const n = await reader.read(chunk);
if (n === null) {
break;
}
if (n < DEFAULT_CHUNK_SIZE) {
chunk = chunk.subarray(0, n);
}
chunks.push(chunk);
}
return concat(chunks);
}
/**
* Synchronously reads {@linkcode ReaderSync} `r` until EOF (`null`) and returns
* the content as {@linkcode Uint8Array}.
*
* @example
* ```ts
* import { readAllSync } from "https://deno.land/std@$STD_VERSION/io/read_all.ts";
*
* // Example from stdin
* const stdinContent = readAllSync(Deno.stdin);
*
* // Example from file
* using file = Deno.openSync("my_file.txt", {read: true});
* const myFileContent = readAllSync(file);
* ```
*/
export function readAllSync(reader: ReaderSync): Uint8Array {
const chunks: Uint8Array[] = [];
while (true) {
const chunk = new Uint8Array(DEFAULT_CHUNK_SIZE);
const n = reader.readSync(chunk);
if (n === null) {
break;
}
if (n < DEFAULT_CHUNK_SIZE) {
chunks.push(chunk.subarray(0, n));
break;
}
chunks.push(chunk);
}
return concat(chunks);
}