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69 lines
1.9 KiB
TypeScript
69 lines
1.9 KiB
TypeScript
// Copyright 2018 the Deno authors. All rights reserved. MIT license.
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import * as base64 from "base64-js";
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import { DenoError, ErrorKind } from "./errors";
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export function atob(s: string): string {
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const rem = s.length % 4;
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// base64-js requires length exactly times of 4
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if (rem > 0) {
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s = s.padEnd(s.length + (4 - rem), "=");
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}
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let byteArray;
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try {
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byteArray = base64.toByteArray(s);
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} catch (_) {
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throw new DenoError(
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ErrorKind.InvalidInput,
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"The string to be decoded is not correctly encoded"
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);
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}
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let result = "";
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for (let i = 0; i < byteArray.length; i++) {
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result += String.fromCharCode(byteArray[i]);
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}
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return result;
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}
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export function btoa(s: string): string {
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const byteArray = [];
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for (let i = 0; i < s.length; i++) {
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const charCode = s[i].charCodeAt(0);
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if (charCode > 0xff) {
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throw new DenoError(
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ErrorKind.InvalidInput,
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"The string to be encoded contains characters " +
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"outside of the Latin1 range."
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);
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}
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byteArray.push(charCode);
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}
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const result = base64.fromByteArray(Uint8Array.from(byteArray));
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return result;
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}
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// @types/text-encoding relies on lib.dom.d.ts for some interfaces. We do not
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// want to include lib.dom.d.ts (due to size) into deno's global type scope.
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// Therefore this hack: add a few of the missing interfaces in
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// @types/text-encoding to the global scope before importing.
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declare global {
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type BufferSource = ArrayBufferView | ArrayBuffer;
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interface TextDecodeOptions {
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stream?: boolean;
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}
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interface TextDecoderOptions {
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fatal?: boolean;
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ignoreBOM?: boolean;
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}
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interface TextDecoder {
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readonly encoding: string;
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readonly fatal: boolean;
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readonly ignoreBOM: boolean;
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decode(input?: BufferSource, options?: TextDecodeOptions): string;
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}
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}
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export { TextEncoder, TextDecoder } from "text-encoding";
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