function _ctPdfLoadTask(bytes, password) {
        try {
            if (password) return PDFJS.getDocument(bytes, null, password, null);
            return PDFJS.getDocument(bytes);
        } catch (e) {
            return PDFJS.getDocument({ data: bytes, password: password || undefined });
        }
    }

    function _ctPdfAwait(task) {
        if (task && typeof task.then === 'function') return task;
        if (task && task.promise && typeof task.promise.then === 'function') return task.promise;
        return Promise.resolve(task);
    }

    function _ctPdfViewport(page, scale) {
        try { return page.getViewport({ scale: scale }); }
        catch (e) { return page.getViewport(scale); }
    }

    function processFile(blob, fileName) {
        var password = (($('.extra-input input').first().val() || '') + '').trim();

        Promise.all([
            new Promise(function(resolve) {
                if (window.PDFJS && PDFJS.getDocument) { resolve(); return; }
                var s = document.createElement('script'); s.src = '/js/pdf.js'; s.onload = resolve; s.onerror = resolve;
                document.head.appendChild(s);
            }),
            loadScriptPromise('https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js')
        ]).then(async function() {
            try {
                var inputBytes = new Uint8Array(await blob.arrayBuffer());
                PDFJS.workerSrc = '/js/pdf.worker.js';
                var pdf = await _ctPdfAwait(_ctPdfLoadTask(inputBytes, password));

                var JsPDFCtor = (window.jspdf && window.jspdf.jsPDF) ? window.jspdf.jsPDF : window.jsPDF;
                if (!JsPDFCtor) {
                    alert('PDF writer failed to load.');
                    return;
                }

                var outDoc = null;
                var renderScale = 2.0;

                for (var i = 1; i <= pdf.numPages; i++) {
                    var page = await pdf.getPage(i);
                    var viewport = _ctPdfViewport(page, renderScale);
                    var canvas = document.createElement('canvas');
                    canvas.width = Math.ceil(viewport.width);
                    canvas.height = Math.ceil(viewport.height);
                    await page.render({ canvasContext: canvas.getContext('2d'), viewport: viewport }).promise;

                    var img = canvas.toDataURL('image/jpeg', 0.92);
                    var orientation = viewport.width > viewport.height ? 'l' : 'p';
                    if (!outDoc) {
                        outDoc = new JsPDFCtor({ orientation: orientation, unit: 'pt', format: [viewport.width, viewport.height], compress: true });
                    } else {
                        outDoc.addPage([viewport.width, viewport.height], orientation);
                    }
                    outDoc.addImage(img, 'JPEG', 0, 0, viewport.width, viewport.height);
                }

                if (!outDoc) {
                    alert('Could not read pages from this PDF.');
                    return;
                }

                var outBlob = outDoc.output('blob');
                var base = (fileName || 'document').replace(/\.pdf$/i, '');
                add_file_output(URL.createObjectURL(outBlob), base + '-unlocked.pdf');
            } catch (err) {
                alert('Could not unlock this PDF. Check the password and try again.');
            }
        }).catch(function() {
            alert('Could not load PDF tools in your browser.');
        });
    }







var _loadedScripts = {};
function loadScriptPromise(url) {
    if (_loadedScripts[url]) return _loadedScripts[url];
    _loadedScripts[url] = new Promise(function (resolve, reject) {
        var s = document.createElement('script');
        s.src = url;
        s.onload = resolve;
        s.onerror = reject;
        document.head.appendChild(s);
    });
    return _loadedScripts[url];
}

function replaceAll(find, replace, str) {
    return str.replace(new RegExp(find, 'g'), replace);
}

function beautify(str) {


    var result = '';

    var length = str.length;

    var i = 0;

    var braceCountLeft = 0;
    var braceCountRight = 0;

    var withinQuotes = false;

    while (i < length) {

        var c = str[i];

        if (c == '"' && (i == 0 || c[i - 1] != '\\')) {
            // non-escaped quotes
            withinQuotes = !withinQuotes;
        }

        if (!withinQuotes && (c == '}' || c == '{' || c == ',')) {

            console.log('Start####' + result);

            // look back and remove carriage returns and whitespace that are already there

            var resultIndex = result.length - 1;
            while (resultIndex >= 0 && (result[resultIndex] == ' ' || result[resultIndex] == '\r' || result[resultIndex] == '\n' || result[resultIndex] == '\t')) {

                resultIndex = resultIndex - 1;
                result = result.substr(0, resultIndex + 1);

                console.log('char ' + result[resultIndex] + '-----' + result + 'zzz ' + result.length + ' ' + resultIndex);

            }


            if (c == '{') {
                braceCountLeft++;
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            } else if (c == '}') {
                braceCountRight++;
                // precede with carriage return
                result += '\r' + GetTabs(braceCountLeft - braceCountRight) + c;
            } else if (c == ',') {
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            }

            var nextChar = '';

            // advance through whitespace and remove carriage returns that are already there
            while (i < length && (str[i + 1] == ' ' || str[i + 1] == '\r' || str[i + 1] == '\n' || str[i + 1] == '\t')) {
                i++;
            }

        } else {

            result += str[i];

        }


        i++;

    }

    return result;

}

function GetTabs(count) {

    var result = '';

    for (var i = 0; i < count; i++) {
        result += '    ';
    }

    return result;

}