locutus
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Locutus other languages' standard libraries to JavaScript for fun and educational purposes
88 lines (87 loc) • 3.71 kB
JavaScript
import { getPhpGlobalCallable, getPhpGlobalEntry, getPhpObjectEntry } from "../_helpers/_phpRuntimeState.js";
import { isObjectLike, isPhpCallable } from "../_helpers/_phpTypes.js";
export function base64_encode(stringToEncode) {
// discuss at: https://locutus.io/php/base64_encode/
// parity verified: PHP 8.3
// original by: Tyler Akins (https://rumkin.com)
// improved by: Bayron Guevara
// improved by: Thunder.m
// improved by: Kevin van Zonneveld (https://kvz.io)
// improved by: Kevin van Zonneveld (https://kvz.io)
// improved by: Rafał Kukawski (https://blog.kukawski.pl)
// bugfixed by: Pellentesque Malesuada
// improved by: Indigo744
// example 1: base64_encode('Kevin van Zonneveld')
// returns 1: 'S2V2aW4gdmFuIFpvbm5ldmVsZA=='
// example 2: base64_encode('a')
// returns 2: 'YQ=='
// example 3: base64_encode('✓ à la mode')
// returns 3: '4pyTIMOgIGxhIG1vZGU='
// encodeUTF8string()
// Internal function to encode properly UTF8 string
// Adapted from Solution #1 at https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/Base64_encoding_and_decoding
const encodeUTF8string = function (str) {
// first we use encodeURIComponent to get percent-encoded UTF-8,
// then we convert the percent encodings into raw bytes which
// can be fed into the base64 encoding algorithm.
return encodeURIComponent(str).replace(/%([0-9A-F]{2})/g, function toSolidBytes(_match, p1) {
return String.fromCharCode(Number.parseInt(p1, 16));
});
};
const bufferValue = getPhpGlobalEntry('Buffer');
if (isObjectLike(bufferValue)) {
const bufferFrom = getPhpObjectEntry(bufferValue, 'from');
if (isPhpCallable(bufferFrom)) {
const encoded = bufferFrom.call(bufferValue, String(stringToEncode));
if (typeof encoded === 'object' && encoded !== null) {
const encodedToString = getPhpObjectEntry(encoded, 'toString');
if (isPhpCallable(encodedToString)) {
const base64Value = encodedToString.call(encoded, 'base64');
if (typeof base64Value === 'string') {
return base64Value;
}
}
}
}
}
const btoaValue = getPhpGlobalCallable('btoa');
if (btoaValue) {
const encoded = btoaValue(encodeUTF8string(String(stringToEncode)));
if (typeof encoded === 'string') {
return encoded;
}
}
const b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
let o1;
let o2;
let o3;
let h1;
let h2;
let h3;
let h4;
let bits;
let i = 0;
let ac = 0;
let enc = '';
const tmpArr = [];
if (!stringToEncode) {
return stringToEncode;
}
stringToEncode = encodeUTF8string(stringToEncode);
do {
// pack three octets into four hexets
o1 = stringToEncode.charCodeAt(i++);
o2 = stringToEncode.charCodeAt(i++);
o3 = stringToEncode.charCodeAt(i++);
bits = (o1 << 16) | (o2 << 8) | o3;
h1 = (bits >> 18) & 0x3f;
h2 = (bits >> 12) & 0x3f;
h3 = (bits >> 6) & 0x3f;
h4 = bits & 0x3f;
// use hexets to index into b64, and append result to encoded string
tmpArr[ac++] = b64.charAt(h1) + b64.charAt(h2) + b64.charAt(h3) + b64.charAt(h4);
} while (i < stringToEncode.length);
enc = tmpArr.join('');
const r = stringToEncode.length % 3;
return (r ? enc.slice(0, r - 3) : enc) + '==='.slice(r || 3);
}