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base64Utils.js

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/**

* @license

* Copyright 2017 The Emscripten Authors

* SPDX-License-Identifier: MIT

*/

#if POLYFILL && (ENVIRONMENT_MAY_BE_SHELL || (ENVIRONMENT_MAY_BE_NODE && MIN_NODE_VERSION < 160000))

#include "polyfill/atob.js"

#endif

// Converts a string of base64 into a byte array (Uint8Array).

function intArrayFromBase64(s) {

#if ENVIRONMENT_MAY_BE_NODE

if (typeof ENVIRONMENT_IS_NODE != 'undefined' && ENVIRONMENT_IS_NODE) {

var buf = Buffer.from(s, 'base64');

return new Uint8Array(buf.buffer, buf.byteOffset, buf.length);

}

#endif

var decoded = atob(s);

var bytes = new Uint8Array(decoded.length);

for (var i = 0 ; i < decoded.length ; ++i) {

bytes[i] = decoded.charCodeAt(i);

}

return bytes;

}

// If filename is a base64 data URI, parses and returns data (Buffer on node,

// Uint8Array otherwise). If filename is not a base64 data URI, returns undefined.

function tryParseAsDataURI(filename) {

if (!isDataURI(filename)) {

return;

}

return intArrayFromBase64(filename.slice(dataURIPrefix.length));

}