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https://github.com/denoland/deno.git
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c73ef5fa14
This commit removes all JS based text encoding / text decoding. Instead encoding now happens in Rust via encoding_rs (already in tree). This implementation retains stream support, but adds the last missing encodings. We are incredibly close to 100% WPT on text encoding now. This should reduce our baseline heap by quite a bit.
62 lines
1.5 KiB
JavaScript
62 lines
1.5 KiB
JavaScript
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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// @ts-check
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/// <reference path="../webidl/internal.d.ts" />
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/// <reference path="../web/internal.d.ts" />
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/// <reference lib="esnext" />
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"use strict";
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((window) => {
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const webidl = window.__bootstrap.webidl;
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const {
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forgivingBase64Encode,
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forgivingBase64Decode,
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} = window.__bootstrap.infra;
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/**
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* @param {string} data
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* @returns {string}
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*/
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function atob(data) {
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data = webidl.converters.DOMString(data, {
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prefix: "Failed to execute 'atob'",
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context: "Argument 1",
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});
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const uint8Array = forgivingBase64Decode(data);
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const result = [...uint8Array]
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.map((byte) => String.fromCharCode(byte))
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.join("");
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return result;
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}
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/**
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* @param {string} data
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* @returns {string}
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*/
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function btoa(data) {
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const prefix = "Failed to execute 'btoa'";
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webidl.requiredArguments(arguments.length, 1, { prefix });
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data = webidl.converters.DOMString(data, {
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prefix,
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context: "Argument 1",
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});
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const byteArray = [...data].map((char) => {
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const charCode = char.charCodeAt(0);
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if (charCode > 0xff) {
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throw new DOMException(
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"The string to be encoded contains characters outside of the Latin1 range.",
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"InvalidCharacterError",
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);
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}
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return charCode;
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});
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return forgivingBase64Encode(Uint8Array.from(byteArray));
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}
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window.__bootstrap.base64 = {
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atob,
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btoa,
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};
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})(globalThis);
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