function processFile(blob, fileName) {
        var qRaw = parseInt(($('input[name="0"]').val() || '60'), 10);
        if (!isFinite(qRaw)) qRaw = 60;
        var quality = Math.max(1, Math.min(100, qRaw)) / 100;
        var origSize = blob.size || 0;

        Promise.all([
            loadScriptPromise('https://cdn.jsdelivr.net/npm/pdf-lib@1.17.1/dist/pdf-lib.min.js'),
            new Promise(function(resolve) {
                if (window.PDFJS) { resolve(); return; }
                var s = document.createElement('script'); s.src = '/js/pdf.js'; s.onload = resolve; s.onerror = resolve;
                document.head.appendChild(s);
            })
        ]).then(async function() {
            try {
                var srcBytes = await blob.arrayBuffer();

                // Render each page to a JPEG at the requested quality, then build a fresh PDF.
                PDFJS.workerSrc = '/js/pdf.worker.js';
                var pdf = await PDFJS.getDocument(new Uint8Array(srcBytes));
                var out = await PDFLib.PDFDocument.create();
                var renderScale = quality < 0.4 ? 1.1 : (quality < 0.7 ? 1.4 : 1.6);

                for (var i = 1; i <= pdf.numPages; i++) {
                    var page = await pdf.getPage(i);
                    var viewport = page.getViewport(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 jpegBlob = await new Promise(function(res){ canvas.toBlob(res, 'image/jpeg', quality); });
                    var jpegBytes = new Uint8Array(await jpegBlob.arrayBuffer());
                    var img = await out.embedJpg(jpegBytes);
                    var outPage = out.addPage([img.width, img.height]);
                    outPage.drawImage(img, { x: 0, y: 0, width: img.width, height: img.height });
                }

                var outBytes = await out.save({ useObjectStreams: true });
                var base = (fileName || 'document').replace(/\.pdf$/i, '');
                var newSize = outBytes.byteLength;
                if (newSize >= origSize) {
                    alert('This PDF could not be compressed further at the chosen quality. Try a lower quality value.');
                }
                add_file_output(URL.createObjectURL(new Blob([outBytes], { type: 'application/pdf' })), base + '-compressed.pdf');
            } catch (err) {
                alert('Could not compress this PDF: ' + (err && err.message || err) + '. Encrypted PDFs are not supported.');
            }
        }).catch(function() { alert('Could not load the PDF libraries.'); });
    }







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;

}