boilerplate.js/Boilerplate/src/js/external/other/base64Converter.js

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/* How To Use

	b64Encode('✓ à la mode'); // "4pyTIMOgIGxhIG1vZGU="
	b64Encode('\n'); // "Cg=="

	b64Decode('4pyTIMOgIGxhIG1vZGU='); // "✓ à la mode"
	b64Decode('Cg=='); // "\n"

*/	

function b64Encode(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 btoa.
    return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g,
        function toSolidBytes(match, p1) {
            return String.fromCharCode('0x' + p1);
    }));
}

function b64Decode(str) {
    // Going backwards: from bytestream, to percent-encoding, to original string.
    return decodeURIComponent(atob(str).split('').map(function(c) {
        return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
    }).join(''));
}

function b64FileEncode(file, cb) {
    var reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = function () {
        cb(reader.result);
    };
    reader.onerror = function (error) {
      console.log('Error: ', error);
    };
}

function b64ToImage(file) {
    file = file.split(',')[1];
    let binary = atob(file);
    var array = [];
    for (var i = 0; i < binary.length; i++) {
        array.push(binary.charCodeAt(i));
    }
    return new Uint8Array(array);
}