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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
/** * Utilities for * {@link https://datatracker.ietf.org/doc/html/rfc4648#section-4 | base64} * encoding and decoding. * * This module is browser compatible. * * ```ts * import { *   encodeBase64, *   decodeBase64, * } from "https://deno.land/std@$STD_VERSION/encoding/base64.ts"; * * const encoded = encodeBase64("foobar"); // "Zm9vYmFy" * * decodeBase64(encoded); // Uint8Array(6) [ 102, 111, 111, 98, 97, 114 ] * ``` * * @module */
import { validateBinaryLike } from "./_util.ts";
const base64abc = [  "A",  "B",  "C",  "D",  "E",  "F",  "G",  "H",  "I",  "J",  "K",  "L",  "M",  "N",  "O",  "P",  "Q",  "R",  "S",  "T",  "U",  "V",  "W",  "X",  "Y",  "Z",  "a",  "b",  "c",  "d",  "e",  "f",  "g",  "h",  "i",  "j",  "k",  "l",  "m",  "n",  "o",  "p",  "q",  "r",  "s",  "t",  "u",  "v",  "w",  "x",  "y",  "z",  "0",  "1",  "2",  "3",  "4",  "5",  "6",  "7",  "8",  "9",  "+",  "/",];
/** * Converts data into a base64-encoded string. * * @see {@link https://datatracker.ietf.org/doc/html/rfc4648#section-4} * * @param data The data to encode. * @returns The base64-encoded string. * * @example * ```ts * import { encodeBase64 } from "https://deno.land/std@$STD_VERSION/encoding/base64.ts"; * * encodeBase64("foobar"); // "Zm9vYmFy" * ``` */export function encodeBase64(data: ArrayBuffer | Uint8Array | string): string {  // CREDIT: https://gist.github.com/enepomnyaschih/72c423f727d395eeaa09697058238727  const uint8 = validateBinaryLike(data);  let result = "";  let i;  const l = uint8.length;  for (i = 2; i < l; i += 3) {    result += base64abc[(uint8[i - 2]!) >> 2];    result += base64abc[      (((uint8[i - 2]!) & 0x03) << 4) |      ((uint8[i - 1]!) >> 4)    ];    result += base64abc[      (((uint8[i - 1]!) & 0x0f) << 2) |      ((uint8[i]!) >> 6)    ];    result += base64abc[(uint8[i]!) & 0x3f];  }  if (i === l + 1) {    // 1 octet yet to write    result += base64abc[(uint8[i - 2]!) >> 2];    result += base64abc[((uint8[i - 2]!) & 0x03) << 4];    result += "==";  }  if (i === l) {    // 2 octets yet to write    result += base64abc[(uint8[i - 2]!) >> 2];    result += base64abc[      (((uint8[i - 2]!) & 0x03) << 4) |      ((uint8[i - 1]!) >> 4)    ];    result += base64abc[((uint8[i - 1]!) & 0x0f) << 2];    result += "=";  }  return result;}
/** * Decodes a base64-encoded string. * * @see {@link https://datatracker.ietf.org/doc/html/rfc4648#section-4} * * @param b64 The base64-encoded string to decode. * @returns The decoded data. * * @example * ```ts * import { decodeBase64 } from "https://deno.land/std@$STD_VERSION/encoding/base64.ts"; * * decodeBase64("Zm9vYmFy"); // Uint8Array(6) [ 102, 111, 111, 98, 97, 114 ] * ``` */export function decodeBase64(b64: string): Uint8Array {  const binString = atob(b64);  const size = binString.length;  const bytes = new Uint8Array(size);  for (let i = 0; i < size; i++) {    bytes[i] = binString.charCodeAt(i);  }  return bytes;}