devextreme/esm/exporter/pdf_creator.js

HTML5 JavaScript Component Suite for Responsive Web Development

/**
 * DevExtreme (esm/exporter/pdf_creator.js)
 * Version: 24.2.6
 * Build date: Mon Mar 17 2025
 *
 * Copyright (c) 2012 - 2025 Developer Express Inc. ALL RIGHTS RESERVED
 * Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
 */
import {
    version
} from "../core/version";
import {
    getWindow
} from "../core/utils/window";
const window = getWindow();
import {
    imageCreator,
    calcScaledInfo
} from "./image_creator";
import {
    isFunction
} from "../core/utils/type";
import {
    extend
} from "../core/utils/extend";
const mainPageTemplate = "%PDF-1.3\r\n2 0 obj\r\n<</ProcSet[/PDF/ImageB/ImageC/ImageI]/XObject<</I0 5 0 R>>>>\r\nendobj\r\n4 0 obj\r\n<</Type/Pages/Kids[1 0 R]/Count 1>>\r\nendobj\r\n7 0 obj\r\n<</OpenAction[1 0 R /FitH null]/Type/Catalog/Pages 4 0 R/PageLayout/OneColumn>>\r\nendobj\r\n1 0 obj\r\n<</Type/Page/Resources 2 0 R/MediaBox[0 0 _width_ _height_]/Contents 3 0 R/Parent 4 0 R>>\r\nendobj\r\n";
const contentTemplate = "3 0 obj\r\n<</Length 52>>stream\r\n0.20 w\n0 G\nq _width_ 0 0 _height_ 0.00 0.00 cm /I0 Do Q\r\nendstream\r\nendobj\r\n";
const infoTemplate = "6 0 obj\r\n<</CreationDate _date_/Producer(DevExtreme _version_)>>\r\nendobj\r\n";
const imageStartTemplate = "5 0 obj\r\n<</Type/XObject/Subtype/Image/Width _width_/Height _height_/ColorSpace/DeviceRGB/BitsPerComponent 8/Filter/DCTDecode/Length _length_>>stream\r\n";
const imageEndTemplate = "\r\nendstream\r\nendobj\r\n";
const trailerTemplate = "trailer\r\n<<\r\n/Size 8\r\n/Root 7 0 R\r\n/Info 6 0 R\r\n>>\r\nstartxref\r\n_length_\r\n%%EOF";
const xrefTemplate = "xref\r\n0 8\r\n0000000000 65535 f\r\n0000000241 00000 n\r\n0000000010 00000 n\r\n_main_ 00000 n\r\n0000000089 00000 n\r\n_image_ 00000 n\r\n_info_ 00000 n\r\n0000000143 00000 n\r\n";
const pad = function(str, len) {
    return str.length < len ? pad("0" + str, len) : str
};
let composePdfString = function(imageString, options, curDate) {
    const margin = 2 * (options.margin || 0);
    let {
        width: width,
        height: height
    } = calcScaledInfo(options.width, options.height);
    width += margin;
    height += margin;
    const widthPt = (.75 * width).toFixed(2);
    const heightPt = (.75 * height).toFixed(2);
    const flooredWidth = Math.floor(width);
    const flooredHeight = Math.floor(height);
    const mainPage = mainPageTemplate.replace("_width_", widthPt).replace("_height_", heightPt);
    const content = contentTemplate.replace("_width_", widthPt).replace("_height_", heightPt);
    const info = infoTemplate.replace("_date_", curDate).replace("_version_", version);
    const image = imageStartTemplate.replace("_width_", flooredWidth).replace("_height_", flooredHeight).replace("_length_", imageString.length) + imageString + imageEndTemplate;
    const xref = getXref(mainPage.length, content.length, info.length);
    const mainContent = mainPage + content + info + image;
    const trailer = trailerTemplate.replace("_length_", mainContent.length);
    return mainContent + xref + trailer
};

function getXref(mainPageLength, contentLength, infoLength) {
    return xrefTemplate.replace("_main_", pad(mainPageLength + "", 10)).replace("_info_", pad(mainPageLength + contentLength + "", 10)).replace("_image_", pad(mainPageLength + contentLength + infoLength + "", 10))
}
let getCurDate = function() {
    return new Date
};
let getBlob = function(binaryData) {
    let i = 0;
    const dataArray = new Uint8Array(binaryData.length);
    for (; i < binaryData.length; i++) {
        dataArray[i] = binaryData.charCodeAt(i)
    }
    return new window.Blob([dataArray.buffer], {
        type: "application/pdf"
    })
};
let getBase64 = function(binaryData) {
    return window.btoa(binaryData)
};

function getTwoDigitValue(value) {
    const stringValue = value.toString();
    if (1 === stringValue.length) {
        return `0${value}`
    }
    return value
}

function convertToPdfDateFormat(date) {
    const dateUnits = [date.getUTCFullYear(), getTwoDigitValue(date.getUTCMonth()), getTwoDigitValue(date.getUTCDate()), getTwoDigitValue(date.getUTCHours()), getTwoDigitValue(date.getUTCMinutes()), getTwoDigitValue(date.getUTCSeconds())];
    return `(D:${dateUnits.join("")}Z00'00')`
}
export function getData(data, options) {
    return imageCreator.getImageData(data, extend({}, options, {
        format: "JPEG"
    })).then((imageString => {
        const binaryData = composePdfString(imageString, options, convertToPdfDateFormat(getCurDate()));
        const pdfData = isFunction(window.Blob) ? getBlob(binaryData) : getBase64(binaryData);
        return pdfData
    }))
}