/* Copyright 2012 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @module pdfjsLib
*/
import {
AbortException,
AnnotationMode,
assert,
getVerbosityLevel,
info,
InvalidPDFException,
isNodeJS,
MAX_IMAGE_SIZE_TO_CACHE,
MissingPDFException,
PasswordException,
RenderingIntentFlag,
setVerbosityLevel,
shadow,
stringToBytes,
UnexpectedResponseException,
UnknownErrorException,
unreachable,
warn,
} from "../shared/util.js";
import {
AnnotationStorage,
PrintAnnotationStorage,
SerializableEmpty,
} from "./annotation_storage.js";
import {
DOMCanvasFactory,
DOMCMapReaderFactory,
DOMFilterFactory,
DOMStandardFontDataFactory,
isDataScheme,
isValidFetchUrl,
PageViewport,
RenderingCancelledException,
StatTimer,
} from "./display_utils.js";
import { FontFaceObject, FontLoader } from "./font_loader.js";
import {
NodeCanvasFactory,
NodeCMapReaderFactory,
NodeFilterFactory,
NodeStandardFontDataFactory,
} from "display-node_utils";
import { CanvasGraphics } from "./canvas.js";
import { cleanupTextLayer } from "./text_layer.js";
import { GlobalWorkerOptions } from "./worker_options.js";
import { MessageHandler } from "../shared/message_handler.js";
import { Metadata } from "./metadata.js";
import { OptionalContentConfig } from "./optional_content_config.js";
import { PDFDataTransportStream } from "./transport_stream.js";
import { PDFFetchStream } from "display-fetch_stream";
import { PDFNetworkStream } from "display-network";
import { PDFNodeStream } from "display-node_stream";
import { XfaText } from "./xfa_text.js";
const DEFAULT_RANGE_CHUNK_SIZE = 65536; // 2^16 = 65536
const RENDERING_CANCELLED_TIMEOUT = 100; // ms
const DELAYED_CLEANUP_TIMEOUT = 5000; // ms
const DefaultCanvasFactory =
typeof PDFJSDev !== "undefined" && PDFJSDev.test("GENERIC") && isNodeJS
? NodeCanvasFactory
: DOMCanvasFactory;
const DefaultCMapReaderFactory =
typeof PDFJSDev !== "undefined" && PDFJSDev.test("GENERIC") && isNodeJS
? NodeCMapReaderFactory
: DOMCMapReaderFactory;
const DefaultFilterFactory =
typeof PDFJSDev !== "undefined" && PDFJSDev.test("GENERIC") && isNodeJS
? NodeFilterFactory
: DOMFilterFactory;
const DefaultStandardFontDataFactory =
typeof PDFJSDev !== "undefined" && PDFJSDev.test("GENERIC") && isNodeJS
? NodeStandardFontDataFactory
: DOMStandardFontDataFactory;
/**
* @typedef { Int8Array | Uint8Array | Uint8ClampedArray |
* Int16Array | Uint16Array |
* Int32Array | Uint32Array | Float32Array |
* Float64Array
* } TypedArray
*/
/**
* @typedef {Object} RefProxy
* @property {number} num
* @property {number} gen
*/
/**
* Document initialization / loading parameters object.
*
* @typedef {Object} DocumentInitParameters
* @property {string | URL} [url] - The URL of the PDF.
* @property {TypedArray | ArrayBuffer | Array<number> | string} [data] -
* Binary PDF data.
* Use TypedArrays (Uint8Array) to improve the memory usage. If PDF data is
* BASE64-encoded, use `atob()` to convert it to a binary string first.
*
* NOTE: If TypedArrays are used they will generally be transferred to the
* worker-thread. This will help reduce main-thread memory usage, however
* it will take ownership of the TypedArrays.
* @property {Object} [httpHeaders] - Basic authentication headers.
* @property {boolean} [withCredentials] - Indicates whether or not
* cross-site Access-Control requests should be made using credentials such
* as cookies or authorization headers. The default is `false`.
* @property {string} [password] - For decrypting password-protected PDFs.
* @property {number} [length] - The PDF file length. It's used for progress
* reports and range requests operations.
* @property {PDFDataRangeTransport} [range] - Allows for using a custom range
* transport implementation.
* @property {number} [rangeChunkSize] - Specify maximum number of bytes fetched
* per range request. The default value is {@link DEFAULT_RANGE_CHUNK_SIZE}.
* @property {PDFWorker} [worker] - The worker that will be used for loading and
* parsing the PDF data.
* @property {number} [verbosity] - Controls the logging level; the constants
* from {@link VerbosityLevel} should be used.
* @property {string} [docBaseUrl] - The base URL of the document, used when
* attempting to recover valid absolute URLs for annotations, and outline
* items, that (incorrectly) only specify relative URLs.
* @property {string} [cMapUrl] - The URL where the predefined Adobe CMaps are
* located. Include the trailing slash.
* @property {boolean} [cMapPacked] - Specifies if the Adobe CMaps are binary
* packed or not. The default value is `true`.
* @property {Object} [CMapReaderFactory] - The factory that will be used when
* reading built-in CMap files. Providing a custom factory is useful for
* environments without Fetch API or `XMLHttpRequest` support, such as
* Node.js. The default value is {DOMCMapReaderFactory}.
* @property {boolean} [useSystemFonts] - When `true`, fonts that aren't
* embedded in the PDF document will fallback to a system font.
* The default value is `true` in web environments and `false` in Node.js;
* unless `disableFontFace === true` in which case this defaults to `false`
* regardless of the environment (to prevent completely broken fonts).
* @property {string} [standardFontDataUrl] - The URL where the standard font
* files are located. Include the trailing slash.
* @property {Object} [StandardFontDataFactory] - The factory that will be used
* when reading the standard font files. Providing a custom factory is useful
* for environments without Fetch API or `XMLHttpRequest` support, such as
* Node.js. The default value is {DOMStandardFontDataFactory}.
* @property {boolean} [useWorkerFetch] - Enable using the Fetch API in the
* worker-thread when reading CMap and standard font files. When `true`,
* the `CMapReaderFactory` and `StandardFontDataFactory` options are ignored.
* The default value is `true` in web environments and `false` in Node.js.
* @property {boolean} [stopAtErrors] - Reject certain promises, e.g.
* `getOperatorList`, `getTextContent`, and `RenderTask`, when the associated
* PDF data cannot be successfully parsed, instead of attempting to recover
* whatever possible of the data. The default value is `false`.
* @property {number} [maxImageSize] - The maximum allowed image size in total
* pixels, i.e. width * height. Images above this value will not be rendered.
* Use -1 for no limit, which is also the default value.
* @property {boolean} [isEvalSupported] - Determines if we can evaluate strings
* as JavaScript. Primarily used to improve performance of font rendering, and
* when parsing PDF functions. The default value is `true`.
* @property {boolean} [isOffscreenCanvasSupported] - Determines if we can use
* `OffscreenCanvas` in the worker. Primarily used to improve performance of
* image conversion/rendering.
* The default value is `true` in web environments and `false` in Node.js.
* @property {number} [canvasMaxAreaInBytes] - The integer value is used to
* know when an image must be resized (uses `OffscreenCanvas` in the worker).
* If it's -1 then a possibly slow algorithm is used to guess the max value.
* @property {boolean} [disableFontFace] - By default fonts are converted to
* OpenType fonts and loaded via the Font Loading API or `@font-face` rules.
* If disabled, fonts will be rendered using a built-in font renderer that
* constructs the glyphs with primitive path commands.
* The default value is `false` in web environments and `true` in Node.js.
* @property {boolean} [fontExtraProperties] - Include additional properties,
* which are unused during rendering of PDF documents, when exporting the
* parsed font data from the worker-thread. This may be useful for debugging
* purposes (and backwards compatibility), but note that it will lead to
* increased memory usage. The default value is `false`.
* @property {boolean} [enableXfa] - Render Xfa forms if any.
* The default value is `false`.
* @property {HTMLDocument} [ownerDocument] - Specify an explicit document
* context to create elements with and to load resources, such as fonts,
* into. Defaults to the current document.
* @property {boolean} [disableRange] - Disable range request loading of PDF
* files. When enabled, and if the server supports partial content requests,
* then the PDF will be fetched in chunks. The default value is `false`.
* @property {boolean} [disableStream] - Disable streaming of PDF file data.
* By default PDF.js attempts to load PDF files in chunks. The default value
* is `false`.
* @property {boolean} [disableAutoFetch] - Disable pre-fetching of PDF file
* data. When range requests are enabled PDF.js will automatically keep
* fetching more data even if it isn't needed to display the current page.
* The default value is `false`.
*
* NOTE: It is also necessary to disable streaming, see above, in order for
* disabling of pre-fetching to work correctly.
* @property {boolean} [pdfBug] - Enables special hooks for debugging PDF.js
* (see `web/debugger.js`). The default value is `false`.
* @property {Object} [canvasFactory] - The factory instance that will be used
* when creating canvases. The default value is {new DOMCanvasFactory()}.
* @property {Object} [filterFactory] - A factory instance that will be used
* to create SVG filters when rendering some images on the main canvas.
*/
/**
* This is the main entry point for loading a PDF and interacting with it.
*
* NOTE: If a URL is used to fetch the PDF data a standard Fetch API call (or
* XHR as fallback) is used, which means it must follow same origin rules,
* e.g. no cross-domain requests without CORS.
*
* @param {string | URL | TypedArray | ArrayBuffer | DocumentInitParameters}
* src - Can be a URL where a PDF file is located, a typed array (Uint8Array)
* already populated with data, or a parameter object.
* @returns {PDFDocumentLoadingTask}
*/
function getDocument(src) {
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
if (typeof src === "string" || src instanceof URL) {
src = { url: src };
} else if (src instanceof ArrayBuffer || ArrayBuffer.isView(src)) {
src = { data: src };
}
}
if (typeof src !== "object") {
throw new Error("Invalid parameter in getDocument, need parameter object.");
}
if (!src.url && !src.data && !src.range) {
throw new Error(
"Invalid parameter object: need either .data, .range or .url"
);
}
const task = new PDFDocumentLoadingTask();
const { docId } = task;
const url = src.url ? getUrlProp(src.url) : null;
const data = src.data ? getDataProp(src.data) : null;
const httpHeaders = src.httpHeaders || null;
const withCredentials = src.withCredentials === true;
const password = src.password ?? null;
const rangeTransport =
src.range instanceof PDFDataRangeTransport ? src.range : null;
const rangeChunkSize =
Number.isInteger(src.rangeChunkSize) && src.rangeChunkSize > 0
? src.rangeChunkSize
: DEFAULT_RANGE_CHUNK_SIZE;
let worker = src.worker instanceof PDFWorker ? src.worker : null;
const verbosity = src.verbosity;
// Ignore "data:"-URLs, since they can't be used to recover valid absolute
// URLs anyway. We want to avoid sending them to the worker-thread, since
// they contain the *entire* PDF document and can thus be arbitrarily long.
const docBaseUrl =
typeof src.docBaseUrl === "string" && !isDataScheme(src.docBaseUrl)
? src.docBaseUrl
: null;
const cMapUrl = typeof src.cMapUrl === "string" ? src.cMapUrl : null;
const cMapPacked = src.cMapPacked !== false;
const CMapReaderFactory = src.CMapReaderFactory || DefaultCMapReaderFactory;
const standardFontDataUrl =
typeof src.standardFontDataUrl === "string"
? src.standardFontDataUrl
: null;
const StandardFontDataFactory =
src.StandardFontDataFactory || DefaultStandardFontDataFactory;
const ignoreErrors = src.stopAtErrors !== true;
const maxImageSize =
Number.isInteger(src.maxImageSize) && src.maxImageSize > -1
? src.maxImageSize
: -1;
const isEvalSupported = src.isEvalSupported !== false;
const isOffscreenCanvasSupported =
typeof src.isOffscreenCanvasSupported === "boolean"
? src.isOffscreenCanvasSupported
: !isNodeJS;
const canvasMaxAreaInBytes = Number.isInteger(src.canvasMaxAreaInBytes)
? src.canvasMaxAreaInBytes
: -1;
const disableFontFace =
typeof src.disableFontFace === "boolean" ? src.disableFontFace : isNodeJS;
const fontExtraProperties = src.fontExtraProperties === true;
const enableXfa = src.enableXfa === true;
const ownerDocument = src.ownerDocument || globalThis.document;
const disableRange = src.disableRange === true;
const disableStream = src.disableStream === true;
const disableAutoFetch = src.disableAutoFetch === true;
const pdfBug = src.pdfBug === true;
// Parameters whose default values depend on other parameters.
const length = rangeTransport ? rangeTransport.length : src.length ?? NaN;
const useSystemFonts =
typeof src.useSystemFonts === "boolean"
? src.useSystemFonts
: !isNodeJS && !disableFontFace;
const useWorkerFetch =
typeof src.useWorkerFetch === "boolean"
? src.useWorkerFetch
: (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) ||
(CMapReaderFactory === DOMCMapReaderFactory &&
StandardFontDataFactory === DOMStandardFontDataFactory &&
cMapUrl &&
standardFontDataUrl &&
isValidFetchUrl(cMapUrl, document.baseURI) &&
isValidFetchUrl(standardFontDataUrl, document.baseURI));
const canvasFactory =
src.canvasFactory || new DefaultCanvasFactory({ ownerDocument });
const filterFactory =
src.filterFactory || new DefaultFilterFactory({ docId, ownerDocument });
// Parameters only intended for development/testing purposes.
const styleElement =
typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")
? src.styleElement
: null;
// Set the main-thread verbosity level.
setVerbosityLevel(verbosity);
// Ensure that the various factories can be initialized, when necessary,
// since the user may provide *custom* ones.
const transportFactory = {
canvasFactory,
filterFactory,
};
if (!useWorkerFetch) {
transportFactory.cMapReaderFactory = new CMapReaderFactory({
baseUrl: cMapUrl,
isCompressed: cMapPacked,
});
transportFactory.standardFontDataFactory = new StandardFontDataFactory({
baseUrl: standardFontDataUrl,
});
}
if (!worker) {
const workerParams = {
verbosity,
port: GlobalWorkerOptions.workerPort,
};
// Worker was not provided -- creating and owning our own. If message port
// is specified in global worker options, using it.
worker = workerParams.port
? PDFWorker.fromPort(workerParams)
: new PDFWorker(workerParams);
task._worker = worker;
}
const fetchDocParams = {
docId,
apiVersion:
typeof PDFJSDev !== "undefined" && !PDFJSDev.test("TESTING")
? PDFJSDev.eval("BUNDLE_VERSION")
: null,
data,
password,
disableAutoFetch,
rangeChunkSize,
length,
docBaseUrl,
enableXfa,
evaluatorOptions: {
maxImageSize,
disableFontFace,
ignoreErrors,
isEvalSupported,
isOffscreenCanvasSupported,
canvasMaxAreaInBytes,
fontExtraProperties,
useSystemFonts,
cMapUrl: useWorkerFetch ? cMapUrl : null,
standardFontDataUrl: useWorkerFetch ? standardFontDataUrl : null,
},
};
const transportParams = {
ignoreErrors,
isEvalSupported,
disableFontFace,
fontExtraProperties,
enableXfa,
ownerDocument,
disableAutoFetch,
pdfBug,
styleElement,
};
worker.promise
.then(function () {
if (task.destroyed) {
throw new Error("Loading aborted");
}
const workerIdPromise = _fetchDocument(worker, fetchDocParams);
const networkStreamPromise = new Promise(function (resolve) {
let networkStream;
if (rangeTransport) {
networkStream = new PDFDataTransportStream(rangeTransport, {
disableRange,
disableStream,
});
} else if (!data) {
if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
throw new Error("Not implemented: createPDFNetworkStream");
}
const createPDFNetworkStream = params => {
if (
typeof PDFJSDev !== "undefined" &&
PDFJSDev.test("GENERIC") &&
isNodeJS
) {
const isFetchSupported = function () {
return (
typeof fetch !== "undefined" &&
typeof Response !== "undefined" &&
"body" in Response.prototype
);
};
return isFetchSupported() && isValidFetchUrl(params.url)
? new PDFFetchStream(params)
: new PDFNodeStream(params);
}
return isValidFetchUrl(params.url)
? new PDFFetchStream(params)
: new PDFNetworkStream(params);
};
networkStream = createPDFNetworkStream({
url,
length,
httpHeaders,
withCredentials,
rangeChunkSize,
disableRange,
disableStream,
});
}
resolve(networkStream);
});
return Promise.all([workerIdPromise, networkStreamPromise]).then(
function ([workerId, networkStream]) {
if (task.destroyed) {
throw new Error("Loading aborted");
}
const messageHandler = new MessageHandler(
docId,
workerId,
worker.port
);
const transport = new WorkerTransport(
messageHandler,
task,
networkStream,
transportParams,
transportFactory
);
task._transport = transport;
messageHandler.send("Ready", null);
}
);
})
.catch(task._capability.reject);
return task;
}
/**
* Starts fetching of specified PDF document/data.
*
* @param {PDFWorker} worker
* @param {Object} source
* @returns {Promise<string>} A promise that is resolved when the worker ID of
* the `MessageHandler` is known.
* @private
*/
async function _fetchDocument(worker, source) {
if (worker.destroyed) {
throw new Error("Worker was destroyed");
}
const workerId = await worker.messageHandler.sendWithPromise(
"GetDocRequest",
source,
source.data ? [source.data.buffer] : null
);
if (worker.destroyed) {
throw new Error("Worker was destroyed");
}
return workerId;
}
function getUrlProp(val) {
if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
return null; // The 'url' is unused with `PDFDataRangeTransport`.
}
if (val instanceof URL) {
return val.href;
}
try {
// The full path is required in the 'url' field.
return new URL(val, window.location).href;
} catch {
if (
typeof PDFJSDev !== "undefined" &&
PDFJSDev.test("GENERIC") &&
isNodeJS &&
typeof val === "string"
) {
return val; // Use the url as-is in Node.js environments.
}
}
throw new Error(
"Invalid PDF url data: " +
"either string or URL-object is expected in the url property."
);
}
function getDataProp(val) {
// Converting string or array-like data to Uint8Array.
if (
typeof PDFJSDev !== "undefined" &&
PDFJSDev.test("GENERIC") &&
isNodeJS &&
typeof Buffer !== "undefined" && // eslint-disable-line no-undef
val instanceof Buffer // eslint-disable-line no-undef
) {
throw new Error(
"Please provide binary data as `Uint8Array`, rather than `Buffer`."
);
}
if (val instanceof Uint8Array && val.byteLength === val.buffer.byteLength) {
// Use the data as-is when it's already a Uint8Array that completely
// "utilizes" its underlying ArrayBuffer, to prevent any possible
// issues when transferring it to the worker-thread.
return val;
}
if (typeof val === "string") {
return stringToBytes(val);
}
if (
val instanceof ArrayBuffer ||
ArrayBuffer.isView(val) ||
(typeof val === "object" && !isNaN(val?.length))
) {
return new Uint8Array(val);
}
throw new Error(
"Invalid PDF binary data: either TypedArray, " +
"string, or array-like object is expected in the data property."
);
}
/**
* @typedef {Object} OnProgressParameters
* @property {number} loaded - Currently loaded number of bytes.
* @property {number} total - Total number of bytes in the PDF file.
*/
/**
* The loading task controls the operations required to load a PDF document
* (such as network requests) and provides a way to listen for completion,
* after which individual pages can be rendered.
*/
class PDFDocumentLoadingTask {
static #docId = 0;
constructor() {
this._capability = Promise.withResolvers();
this._transport = null;
this._worker = null;
/**
* Unique identifier for the document loading task.
* @type {string}
*/
this.docId = `d${PDFDocumentLoadingTask.#docId++}`;
/**
* Whether the loading task is destroyed or not.
* @type {boolean}
*/
this.destroyed = false;
/**
* Callback to request a password if a wrong or no password was provided.
* The callback receives two parameters: a function that should be called
* with the new password, and a reason (see {@link PasswordResponses}).
* @type {function}
*/
this.onPassword = null;
/**
* Callback to be able to monitor the loading progress of the PDF file
* (necessary to implement e.g. a loading bar).
* The callback receives an {@link OnProgressParameters} argument.
* @type {function}
*/
this.onProgress = null;
}
/**
* Promise for document loading task completion.
* @type {Promise<PDFDocumentProxy>}
*/
get promise() {
return this._capability.promise;
}
/**
* Abort all network requests and destroy the worker.
* @returns {Promise<void>} A promise that is resolved when destruction is
* completed.
*/
async destroy() {
this.destroyed = true;
try {
if (this._worker?.port) {
this._worker._pendingDestroy = true;
}
await this._transport?.destroy();
} catch (ex) {
if (this._worker?.port) {
delete this._worker._pendingDestroy;
}
throw ex;
}
this._transport = null;
if (this._worker) {
this._worker.destroy();
this._worker = null;
}
}
}
/**
* Abstract class to support range requests file loading.
*
* NOTE: The TypedArrays passed to the constructor and relevant methods below
* will generally be transferred to the worker-thread. This will help reduce
* main-thread memory usage, however it will take ownership of the TypedArrays.
*/
class PDFDataRangeTransport {
/**
* @param {number} length
* @param {Uint8Array|null} initialData
* @param {boolean} [progressiveDone]
* @param {string} [contentDispositionFilename]
*/
constructor(
length,
initialData,
progressiveDone = false,
contentDispositionFilename = null
) {
this.length = length;
this.initialData = initialData;
this.progressiveDone = progressiveDone;
this.contentDispositionFilename = contentDispositionFilename;
this._rangeListeners = [];
this._progressListeners = [];
this._progressiveReadListeners = [];
this._progressiveDoneListeners = [];
this._readyCapability = Promise.withResolvers();
}
/**
* @param {function} listener
*/
addRangeListener(listener) {
this._rangeListeners.push(listener);
}
/**
* @param {function} listener
*/
addProgressListener(listener) {
this._progressListeners.push(listener);
}
/**
* @param {function} listener
*/
addProgressiveReadListener(listener) {
this._progressiveReadListeners.push(listener);
}
/**
* @param {function} listener
*/
addProgressiveDoneListener(listener) {
this._progressiveDoneListeners.push(listener);
}
/**
* @param {number} begin
* @param {Uint8Array|null} chunk
*/
onDataRange(begin, chunk) {
for (const listener of this._rangeListeners) {
listener(begin, chunk);
}
}
/**
* @param {number} loaded
* @param {number|undefined} total
*/
onDataProgress(loaded, total) {
this._readyCapability.promise.then(() => {
for (const listener of this._progressListeners) {
listener(loaded, total);
}
});
}
/**
* @param {Uint8Array|null} chunk
*/
onDataProgressiveRead(chunk) {
this._readyCapability.promise.then(() => {
for (const listener of this._progressiveReadListeners) {
listener(chunk);
}
});
}
onDataProgressiveDone() {
this._readyCapability.promise.then(() => {
for (const listener of this._progressiveDoneListeners) {
listener();
}
});
}
transportReady() {
this._readyCapability.resolve();
}
/**
* @param {number} begin
* @param {number} end
*/
requestDataRange(begin, end) {
unreachable("Abstract method PDFDataRangeTransport.requestDataRange");
}
abort() {}
}
/**
* Proxy to a `PDFDocument` in the worker thread.
*/
class PDFDocumentProxy {
constructor(pdfInfo, transport) {
this._pdfInfo = pdfInfo;
this._transport = transport;
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
// For testing purposes.
Object.defineProperty(this, "getNetworkStreamName", {
value: () => this._transport.getNetworkStreamName(),
});
Object.defineProperty(this, "getXFADatasets", {
value: () => this._transport.getXFADatasets(),
});
Object.defineProperty(this, "getXRefPrevValue", {
value: () => this._transport.getXRefPrevValue(),
});
Object.defineProperty(this, "getStartXRefPos", {
value: () => this._transport.getStartXRefPos(),
});
Object.defineProperty(this, "getAnnotArray", {
value: pageIndex => this._transport.getAnnotArray(pageIndex),
});
}
}
/**
* @type {AnnotationStorage} Storage for annotation data in forms.
*/
get annotationStorage() {
return this._transport.annotationStorage;
}
/**
* @type {Object} The filter factory instance.
*/
get filterFactory() {
return this._transport.filterFactory;
}
/**
* @type {number} Total number of pages in the PDF file.
*/
get numPages() {
return this._pdfInfo.numPages;
}
/**
* @type {Array<string, string|null>} A (not guaranteed to be) unique ID to
* identify the PDF document.
* NOTE: The first element will always be defined for all PDF documents,
* whereas the second element is only defined for *modified* PDF documents.
*/
get fingerprints() {
return this._pdfInfo.fingerprints;
}
/**
* @type {boolean} True if only XFA form.
*/
get isPureXfa() {
return shadow(this, "isPureXfa", !!this._transport._htmlForXfa);
}
/**
* NOTE: This is (mostly) intended to support printing of XFA forms.
*
* @type {Object | null} An object representing a HTML tree structure
* to render the XFA, or `null` when no XFA form exists.
*/
get allXfaHtml() {
return this._transport._htmlForXfa;
}
/**
* @param {number} pageNumber - The page number to get. The first page is 1.
* @returns {Promise<PDFPageProxy>} A promise that is resolved with
* a {@link PDFPageProxy} object.
*/
getPage(pageNumber) {
return this._transport.getPage(pageNumber);
}
/**
* @param {RefProxy} ref - The page reference.
* @returns {Promise<number>} A promise that is resolved with the page index,
* starting from zero, that is associated with the reference.
*/
getPageIndex(ref) {
return this._transport.getPageIndex(ref);
}
/**
* @returns {Promise<Object<string, Array<any>>>} A promise that is resolved
* with a mapping from named destinations to references.
*
* This can be slow for large documents. Use `getDestination` instead.
*/
getDestinations() {
return this._transport.getDestinations();
}
/**
* @param {string} id - The named destination to get.
* @returns {Promise<Array<any> | null>} A promise that is resolved with all
* information of the given named destination, or `null` when the named
* destination is not present in the PDF file.
*/
getDestination(id) {
return this._transport.getDestination(id);
}
/**
* @returns {Promise<Array<string> | null>} A promise that is resolved with
* an {Array} containing the page labels that correspond to the page
* indexes, or `null` when no page labels are present in the PDF file.
*/
getPageLabels() {
return this._transport.getPageLabels();
}
/**
* @returns {Promise<string>} A promise that is resolved with a {string}
* containing the page layout name.
*/
getPageLayout() {
return this._transport.getPageLayout();
}
/**
* @returns {Promise<string>} A promise that is resolved with a {string}
* containing the page mode name.
*/
getPageMode() {
return this._transport.getPageMode();
}
/**
* @returns {Promise<Object | null>} A promise that is resolved with an
* {Object} containing the viewer preferences, or `null` when no viewer
* preferences are present in the PDF file.
*/
getViewerPreferences() {
return this._transport.getViewerPreferences();
}
/**
* @returns {Promise<any | null>} A promise that is resolved with an {Array}
* containing the destination, or `null` when no open action is present
* in the PDF.
*/
getOpenAction() {
return this._transport.getOpenAction();
}
/**
* @returns {Promise<any>} A promise that is resolved with a lookup table
* for mapping named attachments to their content.
*/
getAttachments() {
return this._transport.getAttachments();
}
/**
* @returns {Promise<Object | null>} A promise that is resolved with
* an {Object} with the JavaScript actions:
* - from the name tree.
* - from A or AA entries in the catalog dictionary.
* , or `null` if no JavaScript exists.
*/
getJSActions() {
return this._transport.getDocJSActions();
}
/**
* @typedef {Object} OutlineNode
* @property {string} title
* @property {boolean} bold
* @property {boolean} italic
* @property {Uint8ClampedArray} color - The color in RGB format to use for
* display purposes.
* @property {string | Array<any> | null} dest
* @property {string | null} url
* @property {string | undefined} unsafeUrl
* @property {boolean | undefined} newWindow
* @property {number | undefined} count
* @property {Array<OutlineNode>} items
*/
/**
* @returns {Promise<Array<OutlineNode>>} A promise that is resolved with an
* {Array} that is a tree outline (if it has one) of the PDF file.
*/
getOutline() {
return this._transport.getOutline();
}
/**
* @typedef {Object} GetOptionalContentConfigParameters
* @property {string} [intent] - Determines the optional content groups that
* are visible by default; valid values are:
* - 'display' (viewable groups).
* - 'print' (printable groups).
* - 'any' (all groups).
* The default value is 'display'.
*/
/**
* @param {GetOptionalContentConfigParameters} [params] - Optional content
* config parameters.
* @returns {Promise<OptionalContentConfig>} A promise that is resolved with
* an {@link OptionalContentConfig} that contains all the optional content
* groups (assuming that the document has any).
*/
getOptionalContentConfig({ intent = "display" } = {}) {
const { renderingIntent } = this._transport.getRenderingIntent(intent);
return this._transport.getOptionalContentConfig(renderingIntent);
}
/**
* @returns {Promise<Array<number> | null>} A promise that is resolved with
* an {Array} that contains the permission flags for the PDF document, or
* `null` when no permissions are present in the PDF file.
*/
getPermissions() {
return this._transport.getPermissions();
}
/**
* @returns {Promise<{ info: Object, metadata: Metadata }>} A promise that is
* resolved with an {Object} that has `info` and `metadata` properties.
* `info` is an {Object} filled with anything available in the information
* dictionary and similarly `metadata` is a {Metadata} object with
* information from the metadata section of the PDF.
*/
getMetadata() {
return this._transport.getMetadata();
}
/**
* @typedef {Object} MarkInfo
* Properties correspond to Table 321 of the PDF 32000-1:2008 spec.
* @property {boolean} Marked
* @property {boolean} UserProperties
* @property {boolean} Suspects
*/
/**
* @returns {Promise<MarkInfo | null>} A promise that is resolved with
* a {MarkInfo} object that contains the MarkInfo flags for the PDF
* document, or `null` when no MarkInfo values are present in the PDF file.
*/
getMarkInfo() {
return this._transport.getMarkInfo();
}
/**
* @returns {Promise<Uint8Array>} A promise that is resolved with a
* {Uint8Array} containing the raw data of the PDF document.
*/
getData() {
return this._transport.getData();
}
/**
* @returns {Promise<Uint8Array>} A promise that is resolved with a
* {Uint8Array} containing the full data of the saved document.
*/
saveDocument() {
return this._transport.saveDocument();
}
/**
* @returns {Promise<{ length: number }>} A promise that is resolved when the
* document's data is loaded. It is resolved with an {Object} that contains
* the `length` property that indicates size of the PDF data in bytes.
*/
getDownloadInfo() {
return this._transport.downloadInfoCapability.promise;
}
/**
* Cleans up resources allocated by the document on both the main and worker
* threads.
*
* NOTE: Do not, under any circumstances, call this method when rendering is
* currently ongoing since that may lead to rendering errors.
*
* @param {boolean} [keepLoadedFonts] - Let fonts remain attached to the DOM.
* NOTE: This will increase persistent memory usage, hence don't use this
* option unless absolutely necessary. The default value is `false`.
* @returns {Promise} A promise that is resolved when clean-up has finished.
*/
cleanup(keepLoadedFonts = false) {
return this._transport.startCleanup(keepLoadedFonts || this.isPureXfa);
}
/**
* Destroys the current document instance and terminates the worker.
*/
destroy() {
return this.loadingTask.destroy();
}
/**
* @type {DocumentInitParameters} A subset of the current
* {DocumentInitParameters}, which are needed in the viewer.
*/
get loadingParams() {
return this._transport.loadingParams;
}
/**
* @type {PDFDocumentLoadingTask} The loadingTask for the current document.
*/
get loadingTask() {
return this._transport.loadingTask;
}
/**
* @returns {Promise<Object<string, Array<Object>> | null>} A promise that is
* resolved with an {Object} containing /AcroForm field data for the JS
* sandbox, or `null` when no field data is present in the PDF file.
*/
getFieldObjects() {
return this._transport.getFieldObjects();
}
/**
* @returns {Promise<boolean>} A promise that is resolved with `true`
* if some /AcroForm fields have JavaScript actions.
*/
hasJSActions() {
return this._transport.hasJSActions();
}
/**
* @returns {Promise<Array<string> | null>} A promise that is resolved with an
* {Array<string>} containing IDs of annotations that have a calculation
* action, or `null` when no such annotations are present in the PDF file.
*/
getCalculationOrderIds() {
return this._transport.getCalculationOrderIds();
}
}
/**
* Page getViewport parameters.
*
* @typedef {Object} GetViewportParameters
* @property {number} scale - The desired scale of the viewport.
* @property {number} [rotation] - The desired rotation, in degrees, of
* the viewport. If omitted it defaults to the page rotation.
* @property {number} [offsetX] - The horizontal, i.e. x-axis, offset.
* The default value is `0`.
* @property {number} [offsetY] - The vertical, i.e. y-axis, offset.
* The default value is `0`.
* @property {boolean} [dontFlip] - If true, the y-axis will not be
* flipped. The default value is `false`.
*/
/**
* Page getTextContent parameters.
*
* @typedef {Object} getTextContentParameters
* @property {boolean} [includeMarkedContent] - When true include marked
* content items in the items array of TextContent. The default is `false`.
* @property {boolean} [disableNormalization] - When true the text is *not*
* normalized in the worker-thread. The default is `false`.
*/
/**
* Page text content.
*
* @typedef {Object} TextContent
* @property {Array<TextItem | TextMarkedContent>} items - Array of
* {@link TextItem} and {@link TextMarkedContent} objects. TextMarkedContent
* items are included when includeMarkedContent is true.
* @property {Object<string, TextStyle>} styles - {@link TextStyle} objects,
* indexed by font name.
*/
/**
* Page text content part.
*
* @typedef {Object} TextItem
* @property {string} str - Text content.
* @property {string} dir - Text direction: 'ttb', 'ltr' or 'rtl'.
* @property {Array<any>} transform - Transformation matrix.
* @property {number} width - Width in device space.
* @property {number} height - Height in device space.
* @property {string} fontName - Font name used by PDF.js for converted font.
* @property {boolean} hasEOL - Indicating if the text content is followed by a
* line-break.
*/
/**
* Page text marked content part.
*
* @typedef {Object} TextMarkedContent
* @property {string} type - Either 'beginMarkedContent',
* 'beginMarkedContentProps', or 'endMarkedContent'.
* @property {string} id - The marked content identifier. Only used for type
* 'beginMarkedContentProps'.
*/
/**
* Text style.
*
* @typedef {Object} TextStyle
* @property {number} ascent - Font ascent.
* @property {number} descent - Font descent.
* @property {boolean} vertical - Whether or not the text is in vertical mode.
* @property {string} fontFamily - The possible font family.
*/
/**
* Page annotation parameters.
*
* @typedef {Object} GetAnnotationsParameters
* @property {string} [intent] - Determines the annotations that are fetched,
* can be 'display' (viewable annotations), 'print' (printable annotations),
* or 'any' (all annotations). The default value is 'display'.
*/
/**
* Page render parameters.
*
* @typedef {Object} RenderParameters
* @property {CanvasRenderingContext2D} canvasContext - A 2D context of a DOM
* Canvas object.
* @property {PageViewport} viewport - Rendering viewport obtained by calling
* the `PDFPageProxy.getViewport` method.
* @property {string} [intent] - Rendering intent, can be 'display', 'print',
* or 'any'. The default value is 'display'.
* @property {number} [annotationMode] Controls which annotations are rendered
* onto the canvas, for annotations with appearance-data; the values from
* {@link AnnotationMode} should be used. The following values are supported:
* - `AnnotationMode.DISABLE`, which disables all annotations.
* - `AnnotationMode.ENABLE`, which includes all possible annotations (thus
* it also depends on the `intent`-option, see above).
* - `AnnotationMode.ENABLE_FORMS`, which excludes annotations that contain
* interactive form elements (those will be rendered in the display layer).
* - `AnnotationMode.ENABLE_STORAGE`, which includes all possible annotations
* (as above) but where interactive form elements are updated with data
* from the {@link AnnotationStorage}-instance; useful e.g. for printing.
* The default value is `AnnotationMode.ENABLE`.
* @property {Array<any>} [transform] - Additional transform, applied just
* before viewport transform.
* @property {CanvasGradient | CanvasPattern | string} [background] - Background
* to use for the canvas.
* Any valid `canvas.fillStyle` can be used: a `DOMString` parsed as CSS
* <color> value, a `CanvasGradient` object (a linear or radial gradient) or
* a `CanvasPattern` object (a repetitive image). The default value is
* 'rgb(255,255,255)'.
*
* NOTE: This option may be partially, or completely, ignored when the
* `pageColors`-option is used.
* @property {Object} [pageColors] - Overwrites background and foreground colors
* with user defined ones in order to improve readability in high contrast
* mode.
* @property {Promise<OptionalContentConfig>} [optionalContentConfigPromise] -
* A promise that should resolve with an {@link OptionalContentConfig}
* created from `PDFDocumentProxy.getOptionalContentConfig`. If `null`,
* the configuration will be fetched automatically with the default visibility
* states set.
* @property {Map<string, HTMLCanvasElement>} [annotationCanvasMap] - Map some
* annotation ids with canvases used to render them.
* @property {PrintAnnotationStorage} [printAnnotationStorage]
*/
/**
* Page getOperatorList parameters.
*
* @typedef {Object} GetOperatorListParameters
* @property {string} [intent] - Rendering intent, can be 'display', 'print',
* or 'any'. The default value is 'display'.
* @property {number} [annotationMode] Controls which annotations are included
* in the operatorList, for annotations with appearance-data; the values from
* {@link AnnotationMode} should be used. The following values are supported:
* - `AnnotationMode.DISABLE`, which disables all annotations.
* - `AnnotationMode.ENABLE`, which includes all possible annotations (thus
* it also depends on the `intent`-option, see above).
* - `AnnotationMode.ENABLE_FORMS`, which excludes annotations that contain
* interactive form elements (those will be rendered in the display layer).
* - `AnnotationMode.ENABLE_STORAGE`, which includes all possible annotations
* (as above) but where interactive form elements are updated with data
* from the {@link AnnotationStorage}-instance; useful e.g. for printing.
* The default value is `AnnotationMode.ENABLE`.
* @property {PrintAnnotationStorage} [printAnnotationStorage]
*/
/**
* Structure tree node. The root node will have a role "Root".
*
* @typedef {Object} StructTreeNode
* @property {Array<StructTreeNode | StructTreeContent>} children - Array of
* {@link StructTreeNode} and {@link StructTreeContent} objects.
* @property {string} role - element's role, already mapped if a role map exists
* in the PDF.
*/
/**
* Structure tree content.
*
* @typedef {Object} StructTreeContent
* @property {string} type - either "content" for page and stream structure
* elements or "object" for object references.
* @property {string} id - unique id that will map to the text layer.
*/
/**
* PDF page operator list.
*
* @typedef {Object} PDFOperatorList
* @property {Array<number>} fnArray - Array containing the operator functions.
* @property {Array<any>} argsArray - Array containing the arguments of the
* functions.
*/
/**
* Proxy to a `PDFPage` in the worker thread.
*/
class PDFPageProxy {
#delayedCleanupTimeout = null;
#pendingCleanup = false;
constructor(pageIndex, pageInfo, transport, pdfBug = false) {
this._pageIndex = pageIndex;
this._pageInfo = pageInfo;
this._transport = transport;
this._stats = pdfBug ? new StatTimer() : null;
this._pdfBug = pdfBug;
/** @type {PDFObjects} */
this.commonObjs = transport.commonObjs;
this.objs = new PDFObjects();
this._maybeCleanupAfterRender = false;
this._intentStates = new Map();
this.destroyed = false;
}
/**
* @type {number} Page number of the page. First page is 1.
*/
get pageNumber() {
return this._pageIndex + 1;
}
/**
* @type {number} The number of degrees the page is rotated clockwise.
*/
get rotate() {
return this._pageInfo.rotate;
}
/**
* @type {RefProxy | null} The reference that points to this page.
*/
get ref() {
return this._pageInfo.ref;
}
/**
* @type {number} The default size of units in 1/72nds of an inch.
*/
get userUnit() {
return this._pageInfo.userUnit;
}
/**
* @type {Array<number>} An array of the visible portion of the PDF page in
* user space units [x1, y1, x2, y2].
*/
get view() {
return this._pageInfo.view;
}
/**
* @param {GetViewportParameters} params - Viewport parameters.
* @returns {PageViewport} Contains 'width' and 'height' properties
* along with transforms required for rendering.
*/
getViewport({
scale,
rotation = this.rotate,
offsetX = 0,
offsetY = 0,
dontFlip = false,
} = {}) {
return new PageViewport({
viewBox: this.view,
scale,
rotation,
offsetX,
offsetY,
dontFlip,
});
}
/**
* @param {GetAnnotationsParameters} [params] - Annotation parameters.
* @returns {Promise<Array<any>>} A promise that is resolved with an
* {Array} of the annotation objects.
*/
getAnnotations({ intent = "display" } = {}) {
const { renderingIntent } = this._transport.getRenderingIntent(intent);
return this._transport.getAnnotations(this._pageIndex, renderingIntent);
}
/**
* @returns {Promise<Object>} A promise that is resolved with an
* {Object} with JS actions.
*/
getJSActions() {
return this._transport.getPageJSActions(this._pageIndex);
}
/**
* @type {Object} The filter factory instance.
*/
get filterFactory() {
return this._transport.filterFactory;
}
/**
* @type {boolean} True if only XFA form.
*/
get isPureXfa() {
return shadow(this, "isPureXfa", !!this._transport._htmlForXfa);
}
/**
* @returns {Promise<Object | null>} A promise that is resolved with
* an {Object} with a fake DOM object (a tree structure where elements
* are {Object} with a name, attributes (class, style, ...), value and
* children, very similar to a HTML DOM tree), or `null` if no XFA exists.
*/
async getXfa() {
return this._transport._htmlForXfa?.children[this._pageIndex] || null;
}
/**
* Begins the process of rendering a page to the desired context.
*
* @param {RenderParameters} params - Page render parameters.
* @returns {RenderTask} An object that contains a promise that is
* resolved when the page finishes rendering.
*/
render({
canvasContext,
viewport,
intent = "display",
annotationMode = AnnotationMode.ENABLE,
transform = null,
background = null,
optionalContentConfigPromise = null,
annotationCanvasMap = null,
pageColors = null,
printAnnotationStorage = null,
}) {
this._stats?.time("Overall");
const intentArgs = this._transport.getRenderingIntent(
intent,
annotationMode,
printAnnotationStorage
);
const { renderingIntent, cacheKey } = intentArgs;
// If there was a pending destroy, cancel it so no cleanup happens during
// this call to render...
this.#pendingCleanup = false;
// ... and ensure that a delayed cleanup is always aborted.
this.#abortDelayedCleanup();
optionalContentConfigPromise ||=
this._transport.getOptionalContentConfig(renderingIntent);
let intentState = this._intentStates.get(cacheKey);
if (!intentState) {
intentState = Object.create(null);
this._intentStates.set(cacheKey, intentState);
}
// Ensure that a pending `streamReader` cancel timeout is always aborted.
if (intentState.streamReaderCancelTimeout) {
clearTimeout(intentState.streamReaderCancelTimeout);
intentState.streamReaderCancelTimeout = null;
}
const intentPrint = !!(renderingIntent & RenderingIntentFlag.PRINT);
// If there's no displayReadyCapability yet, then the operatorList
// was never requested before. Make the request and create the promise.
if (!intentState.displayReadyCapability) {
intentState.displayReadyCapability = Promise.withResolvers();
intentState.operatorList = {
fnArray: [],
argsArray: [],
lastChunk: false,
separateAnnots: null,
};
this._stats?.time("Page Request");
this._pumpOperatorList(intentArgs);
}
const complete = error => {
intentState.renderTasks.delete(internalRenderTask);
// Attempt to reduce memory usage during *printing*, by always running
// cleanup immediately once rendering has finished.
if (this._maybeCleanupAfterRender || intentPrint) {
this.#pendingCleanup = true;
}
this.#tryCleanup(/* delayed = */ !intentPrint);
if (error) {
internalRenderTask.capability.reject(error);
this._abortOperatorList({
intentState,
reason: error instanceof Error ? error : new Error(error),
});
} else {
internalRenderTask.capability.resolve();
}
this._stats?.timeEnd("Rendering");
this._stats?.timeEnd("Overall");
};
const internalRenderTask = new InternalRenderTask({
callback: complete,
// Only include the required properties, and *not* the entire object.
params: {
canvasContext,
viewport,
transform,
background,
},
objs: this.objs,
commonObjs: this.commonObjs,
annotationCanvasMap,
operatorList: intentState.operatorList,
pageIndex: this._pageIndex,
canvasFactory: this._transport.canvasFactory,
filterFactory: this._transport.filterFactory,
useRequestAnimationFrame: !intentPrint,
pdfBug: this._pdfBug,
pageColors,
});
(intentState.renderTasks ||= new Set()).add(internalRenderTask);
const renderTask = internalRenderTask.task;
Promise.all([
intentState.displayReadyCapability.promise,
optionalContentConfigPromise,
])
.then(([transparency, optionalContentConfig]) => {
if (this.destroyed) {
complete();
return;
}
this._stats?.time("Rendering");
if (!(optionalContentConfig.renderingIntent & renderingIntent)) {
throw new Error(
"Must use the same `intent`-argument when calling the `PDFPageProxy.render` " +
"and `PDFDocumentProxy.getOptionalContentConfig` methods."
);
}
internalRenderTask.initializeGraphics({
transparency,
optionalContentConfig,
});
internalRenderTask.operatorListChanged();
})
.catch(complete);
return renderTask;
}
/**
* @param {GetOperatorListParameters} params - Page getOperatorList
* parameters.
* @returns {Promise<PDFOperatorList>} A promise resolved with an
* {@link PDFOperatorList} object that represents the page's operator list.
*/
getOperatorList({
intent = "display",
annotationMode = AnnotationMode.ENABLE,
printAnnotationStorage = null,
} = {}) {
if (typeof PDFJSDev !== "undefined" && !PDFJSDev.test("GENERIC")) {
throw new Error("Not implemented: getOperatorList");
}
function operatorListChanged() {
if (intentState.operatorList.lastChunk) {
intentState.opListReadCapability.resolve(intentState.operatorList);
intentState.renderTasks.delete(opListTask);
}
}
const intentArgs = this._transport.getRenderingIntent(
intent,
annotationMode,
printAnnotationStorage,
/* isOpList = */ true
);
let intentState = this._intentStates.get(intentArgs.cacheKey);
if (!intentState) {
intentState = Object.create(null);
this._intentStates.set(intentArgs.cacheKey, intentState);
}
let opListTask;
if (!intentState.opListReadCapability) {
opListTask = Object.create(null);
opListTask.operatorListChanged = operatorListChanged;
intentState.opListReadCapability = Promise.withResolvers();
(intentState.renderTasks ||= new Set()).add(opListTask);
intentState.operatorList = {
fnArray: [],
argsArray: [],
lastChunk: false,
separateAnnots: null,
};
this._stats?.time("Page Request");
this._pumpOperatorList(intentArgs);
}
return intentState.opListReadCapability.promise;
}
/**
* NOTE: All occurrences of whitespace will be replaced by
* standard spaces (0x20).
*
* @param {getTextContentParameters} params - getTextContent parameters.
* @returns {ReadableStream} Stream for reading text content chunks.
*/
streamTextContent({
includeMarkedContent = false,
disableNormalization = false,
} = {}) {
const TEXT_CONTENT_CHUNK_SIZE = 100;
return this._transport.messageHandler.sendWithStream(
"GetTextContent",
{
pageIndex: this._pageIndex,
includeMarkedContent: includeMarkedContent === true,
disableNormalization: disableNormalization === true,
},
{
highWaterMark: TEXT_CONTENT_CHUNK_SIZE,
size(textContent) {
return textContent.items.length;
},
}
);
}
/**
* NOTE: All occurrences of whitespace will be replaced by
* standard spaces (0x20).
*
* @param {getTextContentParameters} params - getTextContent parameters.
* @returns {Promise<TextContent>} A promise that is resolved with a
* {@link TextContent} object that represents the page's text content.
*/
getTextContent(params = {}) {
if (this._transport._htmlForXfa) {
// TODO: We need to revisit this once the XFA foreground patch lands and
// only do this for non-foreground XFA.
return this.getXfa().then(xfa => XfaText.textContent(xfa));
}
const readableStream = this.streamTextContent(params);
return new Promise(function (resolve, reject) {
function pump() {
reader.read().then(function ({ value, done }) {
if (done) {
resolve(textContent);
return;
}
Object.assign(textContent.styles, value.styles);
textContent.items.push(...value.items);
pump();
}, reject);
}
const reader = readableStream.getReader();
const textContent = {
items: [],
styles: Object.create(null),
};
pump();
});
}
/**
* @returns {Promise<StructTreeNode>} A promise that is resolved with a
* {@link StructTreeNode} object that represents the page's structure tree,
* or `null` when no structure tree is present for the current page.
*/
getStructTree() {
return this._transport.getStructTree(this._pageIndex);
}
/**
* Destroys the page object.
* @private
*/
_destroy() {
this.destroyed = true;
const waitOn = [];
for (const intentState of this._intentStates.values()) {
this._abortOperatorList({
intentState,
reason: new Error("Page was destroyed."),
force: true,
});
if (intentState.opListReadCapability) {
// Avoid errors below, since the renderTasks are just stubs.
continue;
}
for (const internalRenderTask of intentState.renderTasks) {
waitOn.push(internalRenderTask.completed);
internalRenderTask.cancel();
}
}
this.objs.clear();
this.#pendingCleanup = false;
this.#abortDelayedCleanup();
return Promise.all(waitOn);
}
/**
* Cleans up resources allocated by the page.
*
* @param {boolean} [resetStats] - Reset page stats, if enabled.
* The default value is `false`.
* @returns {boolean} Indicates if clean-up was successfully run.
*/
cleanup(resetStats = false) {
this.#pendingCleanup = true;
const success = this.#tryCleanup(/* delayed = */ false);
if (resetStats && success) {
this._stats &&= new StatTimer();
}
return success;
}
/**
* Attempts to clean up if rendering is in a state where that's possible.
* @param {boolean} [delayed] - Delay the cleanup, to e.g. improve zooming
* performance in documents with large images.
* The default value is `false`.
* @returns {boolean} Indicates if clean-up was successfully run.
*/
#tryCleanup(delayed = false) {
this.#abortDelayedCleanup();
if (!this.#pendingCleanup || this.destroyed) {
return false;
}
if (delayed) {
this.#delayedCleanupTimeout = setTimeout(() => {
this.#delayedCleanupTimeout = null;
this.#tryCleanup(/* delayed = */ false);
}, DELAYED_CLEANUP_TIMEOUT);
return false;
}
for (const { renderTasks, operatorList } of this._intentStates.values()) {
if (renderTasks.size > 0 || !operatorList.lastChunk) {
return false;
}
}
this._intentStates.clear();
this.objs.clear();
this.#pendingCleanup = false;
return true;
}
#abortDelayedCleanup() {
if (this.#delayedCleanupTimeout) {
clearTimeout(this.#delayedCleanupTimeout);
this.#delayedCleanupTimeout = null;
}
}
/**
* @private
*/
_startRenderPage(transparency, cacheKey) {
const intentState = this._intentStates.get(cacheKey);
if (!intentState) {
return; // Rendering was cancelled.
}
this._stats?.timeEnd("Page Request");
// TODO Refactor RenderPageRequest to separate rendering
// and operator list logic
intentState.displayReadyCapability?.resolve(transparency);
}
/**
* @private
*/
_renderPageChunk(operatorListChunk, intentState) {
// Add the new chunk to the current operator list.
for (let i = 0, ii = operatorListChunk.length; i < ii; i++) {
intentState.operatorList.fnArray.push(operatorListChunk.fnArray[i]);
intentState.operatorList.argsArray.push(operatorListChunk.argsArray[i]);
}
intentState.operatorList.lastChunk = operatorListChunk.lastChunk;
intentState.operatorList.separateAnnots = operatorListChunk.separateAnnots;
// Notify all the rendering tasks there are more operators to be consumed.
for (const internalRenderTask of intentState.renderTasks) {
internalRenderTask.operatorListChanged();
}
if (operatorListChunk.lastChunk) {
this.#tryCleanup(/* delayed = */ true);
}
}
/**
* @private
*/
_pumpOperatorList({
renderingIntent,
cacheKey,
annotationStorageSerializable,
}) {
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
assert(
Number.isInteger(renderingIntent) && renderingIntent > 0,
'_pumpOperatorList: Expected valid "renderingIntent" argument.'
);
}
const { map, transfer } = annotationStorageSerializable;
const readableStream = this._transport.messageHandler.sendWithStream(
"GetOperatorList",
{
pageIndex: this._pageIndex,
intent: renderingIntent,
cacheKey,
annotationStorage: map,
},
transfer
);
const reader = readableStream.getReader();
const intentState = this._intentStates.get(cacheKey);
intentState.streamReader = reader;
const pump = () => {
reader.read().then(
({ value, done }) => {
if (done) {
intentState.streamReader = null;
return;
}
if (this._transport.destroyed) {
return; // Ignore any pending requests if the worker was terminated.
}
this._renderPageChunk(value, intentState);
pump();
},
reason => {
intentState.streamReader = null;
if (this._transport.destroyed) {
return; // Ignore any pending requests if the worker was terminated.
}
if (intentState.operatorList) {
// Mark operator list as complete.
intentState.operatorList.lastChunk = true;
for (const internalRenderTask of intentState.renderTasks) {
internalRenderTask.operatorListChanged();
}
this.#tryCleanup(/* delayed = */ true);
}
if (intentState.displayReadyCapability) {
intentState.displayReadyCapability.reject(reason);
} else if (intentState.opListReadCapability) {
intentState.opListReadCapability.reject(reason);
} else {
throw reason;
}
}
);
};
pump();
}
/**
* @private
*/
_abortOperatorList({ intentState, reason, force = false }) {
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
assert(
reason instanceof Error,
'_abortOperatorList: Expected valid "reason" argument.'
);
}
if (!intentState.streamReader) {
return;
}
// Ensure that a pending `streamReader` cancel timeout is always aborted.
if (intentState.streamReaderCancelTimeout) {
clearTimeout(intentState.streamReaderCancelTimeout);
intentState.streamReaderCancelTimeout = null;
}
if (!force) {
// Ensure that an Error occurring in *only* one `InternalRenderTask`, e.g.
// multiple render() calls on the same canvas, won't break all rendering.
if (intentState.renderTasks.size > 0) {
return;
}
// Don't immediately abort parsing on the worker-thread when rendering is
// cancelled, since that will unnecessarily delay re-rendering when (for
// partially parsed pages) e.g. zooming/rotation occurs in the viewer.
if (reason instanceof RenderingCancelledException) {
let delay = RENDERING_CANCELLED_TIMEOUT;
if (reason.extraDelay > 0 && reason.extraDelay < /* ms = */ 1000) {
// Above, we prevent the total delay from becoming arbitrarily large.
delay += reason.extraDelay;
}
intentState.streamReaderCancelTimeout = setTimeout(() => {
intentState.streamReaderCancelTimeout = null;
this._abortOperatorList({ intentState, reason, force: true });
}, delay);
return;
}
}
intentState.streamReader
.cancel(new AbortException(reason.message))
.catch(() => {
// Avoid "Uncaught promise" messages in the console.
});
intentState.streamReader = null;
if (this._transport.destroyed) {
return; // Ignore any pending requests if the worker was terminated.
}
// Remove the current `intentState`, since a cancelled `getOperatorList`
// call on the worker-thread cannot be re-started...
for (const [curCacheKey, curIntentState] of this._intentStates) {
if (curIntentState === intentState) {
this._intentStates.delete(curCacheKey);
break;
}
}
// ... and force clean-up to ensure that any old state is always removed.
this.cleanup();
}
/**
* @type {StatTimer | null} Returns page stats, if enabled; returns `null`
* otherwise.
*/
get stats() {
return this._stats;
}
}
class LoopbackPort {
#listeners = new Set();
#deferred = Promise.resolve();
postMessage(obj, transfer) {
const event = {
data: structuredClone(obj, transfer ? { transfer } : null),
};
this.#deferred.then(() => {
for (const listener of this.#listeners) {
listener.call(this, event);
}
});
}
addEventListener(name, listener) {
this.#listeners.add(listener);
}
removeEventListener(name, listener) {
this.#listeners.delete(listener);
}
terminate() {
this.#listeners.clear();
}
}
/**
* @typedef {Object} PDFWorkerParameters
* @property {string} [name] - The name of the worker.
* @property {Worker} [port] - The `workerPort` object.
* @property {number} [verbosity] - Controls the logging level;
* the constants from {@link VerbosityLevel} should be used.
*/
const PDFWorkerUtil = {
isWorkerDisabled: false,
fakeWorkerId: 0,
};
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
if (isNodeJS) {
// Workers aren't supported in Node.js, force-disabling them there.
PDFWorkerUtil.isWorkerDisabled = true;
GlobalWorkerOptions.workerSrc ||= PDFJSDev.test("LIB")
? "../pdf.worker.js"
: "./pdf.worker.mjs";
}
// Check if URLs have the same origin. For non-HTTP based URLs, returns false.
PDFWorkerUtil.isSameOrigin = function (baseUrl, otherUrl) {
let base;
try {
base = new URL(baseUrl);
if (!base.origin || base.origin === "null") {
return false; // non-HTTP url
}
} catch {
return false;
}
const other = new URL(otherUrl, base);
return base.origin === other.origin;
};
PDFWorkerUtil.createCDNWrapper = function (url) {
// We will rely on blob URL's property to specify origin.
// We want this function to fail in case if createObjectURL or Blob do not
// exist or fail for some reason -- our Worker creation will fail anyway.
const wrapper = `await import("${url}");`;
return URL.createObjectURL(
new Blob([wrapper], { type: "text/javascript" })
);
};
}
/**
* PDF.js web worker abstraction that controls the instantiation of PDF
* documents. Message handlers are used to pass information from the main
* thread to the worker thread and vice versa. If the creation of a web
* worker is not possible, a "fake" worker will be used instead.
*
* @param {PDFWorkerParameters} params - The worker initialization parameters.
*/
class PDFWorker {
static #workerPorts;
constructor({
name = null,
port = null,
verbosity = getVerbosityLevel(),
} = {}) {
this.name = name;
this.destroyed = false;
this.verbosity = verbosity;
this._readyCapability = Promise.withResolvers();
this._port = null;
this._webWorker = null;
this._messageHandler = null;
if (
(typeof PDFJSDev === "undefined" || !PDFJSDev.test("MOZCENTRAL")) &&
port
) {
if (PDFWorker.#workerPorts?.has(port)) {
throw new Error("Cannot use more than one PDFWorker per port.");
}
(PDFWorker.#workerPorts ||= new WeakMap()).set(port, this);
this._initializeFromPort(port);
return;
}
this._initialize();
}
/**
* Promise for worker initialization completion.
* @type {Promise<void>}
*/
get promise() {
return this._readyCapability.promise;
}
/**
* The current `workerPort`, when it exists.
* @type {Worker}
*/
get port() {
return this._port;
}
/**
* The current MessageHandler-instance.
* @type {MessageHandler}
*/
get messageHandler() {
return this._messageHandler;
}
_initializeFromPort(port) {
if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
throw new Error("Not implemented: _initializeFromPort");
}
this._port = port;
this._messageHandler = new MessageHandler("main", "worker", port);
this._messageHandler.on("ready", function () {
// Ignoring "ready" event -- MessageHandler should already be initialized
// and ready to accept messages.
});
this._readyCapability.resolve();
// Send global setting, e.g. verbosity level.
this._messageHandler.send("configure", {
verbosity: this.verbosity,
});
}
_initialize() {
// If worker support isn't disabled explicit and the browser has worker
// support, create a new web worker and test if it/the browser fulfills
// all requirements to run parts of pdf.js in a web worker.
// Right now, the requirement is, that an Uint8Array is still an
// Uint8Array as it arrives on the worker. (Chrome added this with v.15.)
if (
!PDFWorkerUtil.isWorkerDisabled &&
!PDFWorker.#mainThreadWorkerMessageHandler
) {
let { workerSrc } = PDFWorker;
try {
// Wraps workerSrc path into blob URL, if the former does not belong
// to the same origin.
if (
typeof PDFJSDev !== "undefined" &&
PDFJSDev.test("GENERIC") &&
!PDFWorkerUtil.isSameOrigin(window.location.href, workerSrc)
) {
workerSrc = PDFWorkerUtil.createCDNWrapper(
new URL(workerSrc, window.location).href
);
}
const worker = new Worker(workerSrc, { type: "module" });
const messageHandler = new MessageHandler("main", "worker", worker);
const terminateEarly = () => {
worker.removeEventListener("error", onWorkerError);
messageHandler.destroy();
worker.terminate();
if (this.destroyed) {
this._readyCapability.reject(new Error("Worker was destroyed"));
} else {
// Fall back to fake worker if the termination is caused by an
// error (e.g. NetworkError / SecurityError).
this._setupFakeWorker();
}
};
const onWorkerError = () => {
if (!this._webWorker) {
// Worker failed to initialize due to an error. Clean up and fall
// back to the fake worker.
terminateEarly();
}
};
worker.addEventListener("error", onWorkerError);
messageHandler.on("test", data => {
worker.removeEventListener("error", onWorkerError);
if (this.destroyed) {
terminateEarly();
return; // worker was destroyed
}
if (data) {
this._messageHandler = messageHandler;
this._port = worker;
this._webWorker = worker;
this._readyCapability.resolve();
// Send global setting, e.g. verbosity level.
messageHandler.send("configure", {
verbosity: this.verbosity,
});
} else {
this._setupFakeWorker();
messageHandler.destroy();
worker.terminate();
}
});
messageHandler.on("ready", data => {
worker.removeEventListener("error", onWorkerError);
if (this.destroyed) {
terminateEarly();
return; // worker was destroyed
}
try {
sendTest();
} catch {
// We need fallback to a faked worker.
this._setupFakeWorker();
}
});
const sendTest = () => {
const testObj = new Uint8Array();
// Ensure that we can use `postMessage` transfers.
messageHandler.send("test", testObj, [testObj.buffer]);
};
// It might take time for the worker to initialize. We will try to send
// the "test" message immediately, and once the "ready" message arrives.
// The worker shall process only the first received "test" message.
sendTest();
return;
} catch {
info("The worker has been disabled.");
}
}
// Either workers are disabled, not supported or have thrown an exception.
// Thus, we fallback to a faked worker.
this._setupFakeWorker();
}
_setupFakeWorker() {
if (!PDFWorkerUtil.isWorkerDisabled) {
warn("Setting up fake worker.");
PDFWorkerUtil.isWorkerDisabled = true;
}
PDFWorker._setupFakeWorkerGlobal
.then(WorkerMessageHandler => {
if (this.destroyed) {
this._readyCapability.reject(new Error("Worker was destroyed"));
return;
}
const port = new LoopbackPort();
this._port = port;
// All fake workers use the same port, making id unique.
const id = `fake${PDFWorkerUtil.fakeWorkerId++}`;
// If the main thread is our worker, setup the handling for the
// messages -- the main thread sends to it self.
const workerHandler = new MessageHandler(id + "_worker", id, port);
WorkerMessageHandler.setup(workerHandler, port);
const messageHandler = new MessageHandler(id, id + "_worker", port);
this._messageHandler = messageHandler;
this._readyCapability.resolve();
// Send global setting, e.g. verbosity level.
messageHandler.send("configure", {
verbosity: this.verbosity,
});
})
.catch(reason => {
this._readyCapability.reject(
new Error(`Setting up fake worker failed: "${reason.message}".`)
);
});
}
/**
* Destroys the worker instance.
*/
destroy() {
this.destroyed = true;
if (this._webWorker) {
// We need to terminate only web worker created resource.
this._webWorker.terminate();
this._webWorker = null;
}
PDFWorker.#workerPorts?.delete(this._port);
this._port = null;
if (this._messageHandler) {
this._messageHandler.destroy();
this._messageHandler = null;
}
}
/**
* @param {PDFWorkerParameters} params - The worker initialization parameters.
*/
static fromPort(params) {
if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
throw new Error("Not implemented: fromPort");
}
if (!params?.port) {
throw new Error("PDFWorker.fromPort - invalid method signature.");
}
const cachedPort = this.#workerPorts?.get(params.port);
if (cachedPort) {
if (cachedPort._pendingDestroy) {
throw new Error(
"PDFWorker.fromPort - the worker is being destroyed.\n" +
"Please remember to await `PDFDocumentLoadingTask.destroy()`-calls."
);
}
return cachedPort;
}
return new PDFWorker(params);
}
/**
* The current `workerSrc`, when it exists.
* @type {string}
*/
static get workerSrc() {
if (GlobalWorkerOptions.workerSrc) {
return GlobalWorkerOptions.workerSrc;
}
throw new Error('No "GlobalWorkerOptions.workerSrc" specified.');
}
static get #mainThreadWorkerMessageHandler() {
try {
return globalThis.pdfjsWorker?.WorkerMessageHandler || null;
} catch {
return null;
}
}
// Loads worker code into the main-thread.
static get _setupFakeWorkerGlobal() {
const loader = async () => {
if (this.#mainThreadWorkerMessageHandler) {
// The worker was already loaded using e.g. a `<script>` tag.
return this.#mainThreadWorkerMessageHandler;
}
const worker =
typeof PDFJSDev === "undefined"
? await import("pdfjs/pdf.worker.js")
: await __non_webpack_import__(this.workerSrc);
return worker.WorkerMessageHandler;
};
return shadow(this, "_setupFakeWorkerGlobal", loader());
}
}
/**
* For internal use only.
* @ignore
*/
class WorkerTransport {
#methodPromises = new Map();
#pageCache = new Map();
#pagePromises = new Map();
#passwordCapability = null;
constructor(messageHandler, loadingTask, networkStream, params, factory) {
this.messageHandler = messageHandler;
this.loadingTask = loadingTask;
this.commonObjs = new PDFObjects();
this.fontLoader = new FontLoader({
ownerDocument: params.ownerDocument,
styleElement: params.styleElement,
});
this._params = params;
this.canvasFactory = factory.canvasFactory;
this.filterFactory = factory.filterFactory;
this.cMapReaderFactory = factory.cMapReaderFactory;
this.standardFontDataFactory = factory.standardFontDataFactory;
this.destroyed = false;
this.destroyCapability = null;
this._networkStream = networkStream;
this._fullReader = null;
this._lastProgress = null;
this.downloadInfoCapability = Promise.withResolvers();
this.setupMessageHandler();
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
// For testing purposes.
Object.defineProperty(this, "getNetworkStreamName", {
value: () => networkStream?.constructor?.name || null,
});
Object.defineProperty(this, "getXFADatasets", {
value: () =>
this.messageHandler.sendWithPromise("GetXFADatasets", null),
});
Object.defineProperty(this, "getXRefPrevValue", {
value: () =>
this.messageHandler.sendWithPromise("GetXRefPrevValue", null),
});
Object.defineProperty(this, "getStartXRefPos", {
value: () =>
this.messageHandler.sendWithPromise("GetStartXRefPos", null),
});
Object.defineProperty(this, "getAnnotArray", {
value: pageIndex =>
this.messageHandler.sendWithPromise("GetAnnotArray", { pageIndex }),
});
}
}
#cacheSimpleMethod(name, data = null) {
const cachedPromise = this.#methodPromises.get(name);
if (cachedPromise) {
return cachedPromise;
}
const promise = this.messageHandler.sendWithPromise(name, data);
this.#methodPromises.set(name, promise);
return promise;
}
get annotationStorage() {
return shadow(this, "annotationStorage", new AnnotationStorage());
}
getRenderingIntent(
intent,
annotationMode = AnnotationMode.ENABLE,
printAnnotationStorage = null,
isOpList = false
) {
let renderingIntent = RenderingIntentFlag.DISPLAY; // Default value.
let annotationStorageSerializable = SerializableEmpty;
switch (intent) {
case "any":
renderingIntent = RenderingIntentFlag.ANY;
break;
case "display":
break;
case "print":
renderingIntent = RenderingIntentFlag.PRINT;
break;
default:
warn(`getRenderingIntent - invalid intent: ${intent}`);
}
switch (annotationMode) {
case AnnotationMode.DISABLE:
renderingIntent += RenderingIntentFlag.ANNOTATIONS_DISABLE;
break;
case AnnotationMode.ENABLE:
break;
case AnnotationMode.ENABLE_FORMS:
renderingIntent += RenderingIntentFlag.ANNOTATIONS_FORMS;
break;
case AnnotationMode.ENABLE_STORAGE:
renderingIntent += RenderingIntentFlag.ANNOTATIONS_STORAGE;
const annotationStorage =
renderingIntent & RenderingIntentFlag.PRINT &&
printAnnotationStorage instanceof PrintAnnotationStorage
? printAnnotationStorage
: this.annotationStorage;
annotationStorageSerializable = annotationStorage.serializable;
break;
default:
warn(`getRenderingIntent - invalid annotationMode: ${annotationMode}`);
}
if (isOpList) {
renderingIntent += RenderingIntentFlag.OPLIST;
}
return {
renderingIntent,
cacheKey: `${renderingIntent}_${annotationStorageSerializable.hash}`,
annotationStorageSerializable,
};
}
destroy() {
if (this.destroyCapability) {
return this.destroyCapability.promise;
}
this.destroyed = true;
this.destroyCapability = Promise.withResolvers();
this.#passwordCapability?.reject(
new Error("Worker was destroyed during onPassword callback")
);
const waitOn = [];
// We need to wait for all renderings to be completed, e.g.
// timeout/rAF can take a long time.
for (const page of this.#pageCache.values()) {
waitOn.push(page._destroy());
}
this.#pageCache.clear();
this.#pagePromises.clear();
// Allow `AnnotationStorage`-related clean-up when destroying the document.
if (this.hasOwnProperty("annotationStorage")) {
this.annotationStorage.resetModified();
}
// We also need to wait for the worker to finish its long running tasks.
const terminated = this.messageHandler.sendWithPromise("Terminate", null);
waitOn.push(terminated);
Promise.all(waitOn).then(() => {
this.commonObjs.clear();
this.fontLoader.clear();
this.#methodPromises.clear();
this.filterFactory.destroy();
cleanupTextLayer();
this._networkStream?.cancelAllRequests(
new AbortException("Worker was terminated.")
);
if (this.messageHandler) {
this.messageHandler.destroy();
this.messageHandler = null;
}
this.destroyCapability.resolve();
}, this.destroyCapability.reject);
return this.destroyCapability.promise;
}
setupMessageHandler() {
const { messageHandler, loadingTask } = this;
messageHandler.on("GetReader", (data, sink) => {
assert(
this._networkStream,
"GetReader - no `IPDFStream` instance available."
);
this._fullReader = this._networkStream.getFullReader();
this._fullReader.onProgress = evt => {
this._lastProgress = {
loaded: evt.loaded,
total: evt.total,
};
};
sink.onPull = () => {
this._fullReader
.read()
.then(function ({ value, done }) {
if (done) {
sink.close();
return;
}
assert(
value instanceof ArrayBuffer,
"GetReader - expected an ArrayBuffer."
);
// Enqueue data chunk into sink, and transfer it
// to other side as `Transferable` object.
sink.enqueue(new Uint8Array(value), 1, [value]);
})
.catch(reason => {
sink.error(reason);
});
};
sink.onCancel = reason => {
this._fullReader.cancel(reason);
sink.ready.catch(readyReason => {
if (this.destroyed) {
return; // Ignore any pending requests if the worker was terminated.
}
throw readyReason;
});
};
});
messageHandler.on("ReaderHeadersReady", data => {
const headersCapability = Promise.withResolvers();
const fullReader = this._fullReader;
fullReader.headersReady.then(() => {
// If stream or range are disabled, it's our only way to report
// loading progress.
if (!fullReader.isStreamingSupported || !fullReader.isRangeSupported) {
if (this._lastProgress) {
loadingTask.onProgress?.(this._lastProgress);
}
fullReader.onProgress = evt => {
loadingTask.onProgress?.({
loaded: evt.loaded,
total: evt.total,
});
};
}
headersCapability.resolve({
isStreamingSupported: fullReader.isStreamingSupported,
isRangeSupported: fullReader.isRangeSupported,
contentLength: fullReader.contentLength,
});
}, headersCapability.reject);
return headersCapability.promise;
});
messageHandler.on("GetRangeReader", (data, sink) => {
assert(
this._networkStream,
"GetRangeReader - no `IPDFStream` instance available."
);
const rangeReader = this._networkStream.getRangeReader(
data.begin,
data.end
);
// When streaming is enabled, it's possible that the data requested here
// has already been fetched via the `_fullRequestReader` implementation.
// However, given that the PDF data is loaded asynchronously on the
// main-thread and then sent via `postMessage` to the worker-thread,
// it may not have been available during parsing (hence the attempt to
// use range requests here).
//
// To avoid wasting time and resources here, we'll thus *not* dispatch
// range requests if the data was already loaded but has not been sent to
// the worker-thread yet (which will happen via the `_fullRequestReader`).
if (!rangeReader) {
sink.close();
return;
}
sink.onPull = () => {
rangeReader
.read()
.then(function ({ value, done }) {
if (done) {
sink.close();
return;
}
assert(
value instanceof ArrayBuffer,
"GetRangeReader - expected an ArrayBuffer."
);
sink.enqueue(new Uint8Array(value), 1, [value]);
})
.catch(reason => {
sink.error(reason);
});
};
sink.onCancel = reason => {
rangeReader.cancel(reason);
sink.ready.catch(readyReason => {
if (this.destroyed) {
return; // Ignore any pending requests if the worker was terminated.
}
throw readyReason;
});
};
});
messageHandler.on("GetDoc", ({ pdfInfo }) => {
this._numPages = pdfInfo.numPages;
this._htmlForXfa = pdfInfo.htmlForXfa;
delete pdfInfo.htmlForXfa;
loadingTask._capability.resolve(new PDFDocumentProxy(pdfInfo, this));
});
messageHandler.on("DocException", function (ex) {
let reason;
switch (ex.name) {
case "PasswordException":
reason = new PasswordException(ex.message, ex.code);
break;
case "InvalidPDFException":
reason = new InvalidPDFException(ex.message);
break;
case "MissingPDFException":
reason = new MissingPDFException(ex.message);
break;
case "UnexpectedResponseException":
reason = new UnexpectedResponseException(ex.message, ex.status);
break;
case "UnknownErrorException":
reason = new UnknownErrorException(ex.message, ex.details);
break;
default:
unreachable("DocException - expected a valid Error.");
}
loadingTask._capability.reject(reason);
});
messageHandler.on("PasswordRequest", exception => {
this.#passwordCapability = Promise.withResolvers();
if (loadingTask.onPassword) {
const updatePassword = password => {
if (password instanceof Error) {
this.#passwordCapability.reject(password);
} else {
this.#passwordCapability.resolve({ password });
}
};
try {
loadingTask.onPassword(updatePassword, exception.code);
} catch (ex) {
this.#passwordCapability.reject(ex);
}
} else {
this.#passwordCapability.reject(
new PasswordException(exception.message, exception.code)
);
}
return this.#passwordCapability.promise;
});
messageHandler.on("DataLoaded", data => {
// For consistency: Ensure that progress is always reported when the
// entire PDF file has been loaded, regardless of how it was fetched.
loadingTask.onProgress?.({
loaded: data.length,
total: data.length,
});
this.downloadInfoCapability.resolve(data);
});
messageHandler.on("StartRenderPage", data => {
if (this.destroyed) {
return; // Ignore any pending requests if the worker was terminated.
}
const page = this.#pageCache.get(data.pageIndex);
page._startRenderPage(data.transparency, data.cacheKey);
});
messageHandler.on("commonobj", ([id, type, exportedData]) => {
if (this.destroyed) {
return null; // Ignore any pending requests if the worker was terminated.
}
if (this.commonObjs.has(id)) {
return null;
}
switch (type) {
case "Font":
const params = this._params;
if ("error" in exportedData) {
const exportedError = exportedData.error;
warn(`Error during font loading: ${exportedError}`);
this.commonObjs.resolve(id, exportedError);
break;
}
const inspectFont =
params.pdfBug && globalThis.FontInspector?.enabled
? (font, url) => globalThis.FontInspector.fontAdded(font, url)
: null;
const font = new FontFaceObject(exportedData, {
isEvalSupported: params.isEvalSupported,
disableFontFace: params.disableFontFace,
ignoreErrors: params.ignoreErrors,
inspectFont,
});
this.fontLoader
.bind(font)
.catch(() => messageHandler.sendWithPromise("FontFallback", { id }))
.finally(() => {
if (!params.fontExtraProperties && font.data) {
// Immediately release the `font.data` property once the font
// has been attached to the DOM, since it's no longer needed,
// rather than waiting for a `PDFDocumentProxy.cleanup` call.
// Since `font.data` could be very large, e.g. in some cases
// multiple megabytes, this will help reduce memory usage.
font.data = null;
}
this.commonObjs.resolve(id, font);
});
break;
case "CopyLocalImage":
const { imageRef } = exportedData;
assert(imageRef, "The imageRef must be defined.");
for (const pageProxy of this.#pageCache.values()) {
for (const [, data] of pageProxy.objs) {
if (data.ref !== imageRef) {
continue;
}
if (!data.dataLen) {
return null;
}
this.commonObjs.resolve(id, structuredClone(data));
return data.dataLen;
}
}
break;
case "FontPath":
case "Image":
case "Pattern":
this.commonObjs.resolve(id, exportedData);
break;
default:
throw new Error(`Got unknown common object type ${type}`);
}
return null;
});
messageHandler.on("obj", ([id, pageIndex, type, imageData]) => {
if (this.destroyed) {
// Ignore any pending requests if the worker was terminated.
return;
}
const pageProxy = this.#pageCache.get(pageIndex);
if (pageProxy.objs.has(id)) {
return;
}
// Don't store data *after* cleanup has successfully run, see bug 1854145.
if (pageProxy._intentStates.size === 0) {
imageData?.bitmap?.close(); // Release any `ImageBitmap` data.
return;
}
switch (type) {
case "Image":
pageProxy.objs.resolve(id, imageData);
// Heuristic that will allow us not to store large data.
if (imageData?.dataLen > MAX_IMAGE_SIZE_TO_CACHE) {
pageProxy._maybeCleanupAfterRender = true;
}
break;
case "Pattern":
pageProxy.objs.resolve(id, imageData);
break;
default:
throw new Error(`Got unknown object type ${type}`);
}
});
messageHandler.on("DocProgress", data => {
if (this.destroyed) {
return; // Ignore any pending requests if the worker was terminated.
}
loadingTask.onProgress?.({
loaded: data.loaded,
total: data.total,
});
});
messageHandler.on("FetchBuiltInCMap", data => {
if (this.destroyed) {
return Promise.reject(new Error("Worker was destroyed."));
}
if (!this.cMapReaderFactory) {
return Promise.reject(
new Error(
"CMapReaderFactory not initialized, see the `useWorkerFetch` parameter."
)
);
}
return this.cMapReaderFactory.fetch(data);
});
messageHandler.on("FetchStandardFontData", data => {
if (this.destroyed) {
return Promise.reject(new Error("Worker was destroyed."));
}
if (!this.standardFontDataFactory) {
return Promise.reject(
new Error(
"StandardFontDataFactory not initialized, see the `useWorkerFetch` parameter."
)
);
}
return this.standardFontDataFactory.fetch(data);
});
}
getData() {
return this.messageHandler.sendWithPromise("GetData", null);
}
saveDocument() {
if (this.annotationStorage.size <= 0) {
warn(
"saveDocument called while `annotationStorage` is empty, " +
"please use the getData-method instead."
);
}
const { map, transfer } = this.annotationStorage.serializable;
return this.messageHandler
.sendWithPromise(
"SaveDocument",
{
isPureXfa: !!this._htmlForXfa,
numPages: this._numPages,
annotationStorage: map,
filename: this._fullReader?.filename ?? null,
},
transfer
)
.finally(() => {
this.annotationStorage.resetModified();
});
}
getPage(pageNumber) {
if (
!Number.isInteger(pageNumber) ||
pageNumber <= 0 ||
pageNumber > this._numPages
) {
return Promise.reject(new Error("Invalid page request."));
}
const pageIndex = pageNumber - 1,
cachedPromise = this.#pagePromises.get(pageIndex);
if (cachedPromise) {
return cachedPromise;
}
const promise = this.messageHandler
.sendWithPromise("GetPage", {
pageIndex,
})
.then(pageInfo => {
if (this.destroyed) {
throw new Error("Transport destroyed");
}
const page = new PDFPageProxy(
pageIndex,
pageInfo,
this,
this._params.pdfBug
);
this.#pageCache.set(pageIndex, page);
return page;
});
this.#pagePromises.set(pageIndex, promise);
return promise;
}
getPageIndex(ref) {
if (
typeof ref !== "object" ||
!Number.isInteger(ref?.num) ||
ref.num < 0 ||
!Number.isInteger(ref?.gen) ||
ref.gen < 0
) {
return Promise.reject(new Error("Invalid pageIndex request."));
}
return this.messageHandler.sendWithPromise("GetPageIndex", {
num: ref.num,
gen: ref.gen,
});
}
getAnnotations(pageIndex, intent) {
return this.messageHandler.sendWithPromise("GetAnnotations", {
pageIndex,
intent,
});
}
getFieldObjects() {
return this.#cacheSimpleMethod("GetFieldObjects");
}
hasJSActions() {
return this.#cacheSimpleMethod("HasJSActions");
}
getCalculationOrderIds() {
return this.messageHandler.sendWithPromise("GetCalculationOrderIds", null);
}
getDestinations() {
return this.messageHandler.sendWithPromise("GetDestinations", null);
}
getDestination(id) {
if (typeof id !== "string") {
return Promise.reject(new Error("Invalid destination request."));
}
return this.messageHandler.sendWithPromise("GetDestination", {
id,
});
}
getPageLabels() {
return this.messageHandler.sendWithPromise("GetPageLabels", null);
}
getPageLayout() {
return this.messageHandler.sendWithPromise("GetPageLayout", null);
}
getPageMode() {
return this.messageHandler.sendWithPromise("GetPageMode", null);
}
getViewerPreferences() {
return this.messageHandler.sendWithPromise("GetViewerPreferences", null);
}
getOpenAction() {
return this.messageHandler.sendWithPromise("GetOpenAction", null);
}
getAttachments() {
return this.messageHandler.sendWithPromise("GetAttachments", null);
}
getDocJSActions() {
return this.#cacheSimpleMethod("GetDocJSActions");
}
getPageJSActions(pageIndex) {
return this.messageHandler.sendWithPromise("GetPageJSActions", {
pageIndex,
});
}
getStructTree(pageIndex) {
return this.messageHandler.sendWithPromise("GetStructTree", {
pageIndex,
});
}
getOutline() {
return this.messageHandler.sendWithPromise("GetOutline", null);
}
getOptionalContentConfig(renderingIntent) {
return this.#cacheSimpleMethod("GetOptionalContentConfig").then(
data => new OptionalContentConfig(data, renderingIntent)
);
}
getPermissions() {
return this.messageHandler.sendWithPromise("GetPermissions", null);
}
getMetadata() {
const name = "GetMetadata",
cachedPromise = this.#methodPromises.get(name);
if (cachedPromise) {
return cachedPromise;
}
const promise = this.messageHandler
.sendWithPromise(name, null)
.then(results => ({
info: results[0],
metadata: results[1] ? new Metadata(results[1]) : null,
contentDispositionFilename: this._fullReader?.filename ?? null,
contentLength: this._fullReader?.contentLength ?? null,
}));
this.#methodPromises.set(name, promise);
return promise;
}
getMarkInfo() {
return this.messageHandler.sendWithPromise("GetMarkInfo", null);
}
async startCleanup(keepLoadedFonts = false) {
if (this.destroyed) {
return; // No need to manually clean-up when destruction has started.
}
await this.messageHandler.sendWithPromise("Cleanup", null);
for (const page of this.#pageCache.values()) {
const cleanupSuccessful = page.cleanup();
if (!cleanupSuccessful) {
throw new Error(
`startCleanup: Page ${page.pageNumber} is currently rendering.`
);
}
}
this.commonObjs.clear();
if (!keepLoadedFonts) {
this.fontLoader.clear();
}
this.#methodPromises.clear();
this.filterFactory.destroy(/* keepHCM = */ true);
cleanupTextLayer();
}
get loadingParams() {
const { disableAutoFetch, enableXfa } = this._params;
return shadow(this, "loadingParams", {
disableAutoFetch,
enableXfa,
});
}
}
const INITIAL_DATA = Symbol("INITIAL_DATA");
/**
* A PDF document and page is built of many objects. E.g. there are objects for
* fonts, images, rendering code, etc. These objects may get processed inside of
* a worker. This class implements some basic methods to manage these objects.
*/
class PDFObjects {
#objs = Object.create(null);
/**
* Ensures there is an object defined for `objId`.
*
* @param {string} objId
* @returns {Object}
*/
#ensureObj(objId) {
return (this.#objs[objId] ||= {
...Promise.withResolvers(),
data: INITIAL_DATA,
});
}
/**
* If called *without* callback, this returns the data of `objId` but the
* object needs to be resolved. If it isn't, this method throws.
*
* If called *with* a callback, the callback is called with the data of the
* object once the object is resolved. That means, if you call this method
* and the object is already resolved, the callback gets called right away.
*
* @param {string} objId
* @param {function} [callback]
* @returns {any}
*/
get(objId, callback = null) {
// If there is a callback, then the get can be async and the object is
// not required to be resolved right now.
if (callback) {
const obj = this.#ensureObj(objId);
obj.promise.then(() => callback(obj.data));
return null;
}
// If there isn't a callback, the user expects to get the resolved data
// directly.
const obj = this.#objs[objId];
// If there isn't an object yet or the object isn't resolved, then the
// data isn't ready yet!
if (!obj || obj.data === INITIAL_DATA) {
throw new Error(`Requesting object that isn't resolved yet ${objId}.`);
}
return obj.data;
}
/**
* @param {string} objId
* @returns {boolean}
*/
has(objId) {
const obj = this.#objs[objId];
return !!obj && obj.data !== INITIAL_DATA;
}
/**
* Resolves the object `objId` with optional `data`.
*
* @param {string} objId
* @param {any} [data]
*/
resolve(objId, data = null) {
const obj = this.#ensureObj(objId);
obj.data = data;
obj.resolve();
}
clear() {
for (const objId in this.#objs) {
const { data } = this.#objs[objId];
data?.bitmap?.close(); // Release any `ImageBitmap` data.
}
this.#objs = Object.create(null);
}
*[Symbol.iterator]() {
for (const objId in this.#objs) {
const { data } = this.#objs[objId];
if (data === INITIAL_DATA) {
continue;
}
yield [objId, data];
}
}
}
/**
* Allows controlling of the rendering tasks.
*/
class RenderTask {
#internalRenderTask = null;
constructor(internalRenderTask) {
this.#internalRenderTask = internalRenderTask;
/**
* Callback for incremental rendering -- a function that will be called
* each time the rendering is paused. To continue rendering call the
* function that is the first argument to the callback.
* @type {function}
*/
this.onContinue = null;
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
// For testing purposes.
Object.defineProperty(this, "getOperatorList", {
value: () => this.#internalRenderTask.operatorList,
});
}
}
/**
* Promise for rendering task completion.
* @type {Promise<void>}
*/
get promise() {
return this.#internalRenderTask.capability.promise;
}
/**
* Cancels the rendering task. If the task is currently rendering it will
* not be cancelled until graphics pauses with a timeout. The promise that
* this object extends will be rejected when cancelled.
*
* @param {number} [extraDelay]
*/
cancel(extraDelay = 0) {
this.#internalRenderTask.cancel(/* error = */ null, extraDelay);
}
/**
* Whether form fields are rendered separately from the main operatorList.
* @type {boolean}
*/
get separateAnnots() {
const { separateAnnots } = this.#internalRenderTask.operatorList;
if (!separateAnnots) {
return false;
}
const { annotationCanvasMap } = this.#internalRenderTask;
return (
separateAnnots.form ||
(separateAnnots.canvas && annotationCanvasMap?.size > 0)
);
}
}
/**
* For internal use only.
* @ignore
*/
class InternalRenderTask {
static #canvasInUse = new WeakSet();
constructor({
callback,
params,
objs,
commonObjs,
annotationCanvasMap,
operatorList,
pageIndex,
canvasFactory,
filterFactory,
useRequestAnimationFrame = false,
pdfBug = false,
pageColors = null,
}) {
this.callback = callback;
this.params = params;
this.objs = objs;
this.commonObjs = commonObjs;
this.annotationCanvasMap = annotationCanvasMap;
this.operatorListIdx = null;
this.operatorList = operatorList;
this._pageIndex = pageIndex;
this.canvasFactory = canvasFactory;
this.filterFactory = filterFactory;
this._pdfBug = pdfBug;
this.pageColors = pageColors;
this.running = false;
this.graphicsReadyCallback = null;
this.graphicsReady = false;
this._useRequestAnimationFrame =
useRequestAnimationFrame === true && typeof window !== "undefined";
this.cancelled = false;
this.capability = Promise.withResolvers();
this.task = new RenderTask(this);
// caching this-bound methods
this._cancelBound = this.cancel.bind(this);
this._continueBound = this._continue.bind(this);
this._scheduleNextBound = this._scheduleNext.bind(this);
this._nextBound = this._next.bind(this);
this._canvas = params.canvasContext.canvas;
}
get completed() {
return this.capability.promise.catch(function () {
// Ignoring errors, since we only want to know when rendering is
// no longer pending.
});
}
initializeGraphics({ transparency = false, optionalContentConfig }) {
if (this.cancelled) {
return;
}
if (this._canvas) {
if (InternalRenderTask.#canvasInUse.has(this._canvas)) {
throw new Error(
"Cannot use the same canvas during multiple render() operations. " +
"Use different canvas or ensure previous operations were " +
"cancelled or completed."
);
}
InternalRenderTask.#canvasInUse.add(this._canvas);
}
if (this._pdfBug && globalThis.StepperManager?.enabled) {
this.stepper = globalThis.StepperManager.create(this._pageIndex);
this.stepper.init(this.operatorList);
this.stepper.nextBreakPoint = this.stepper.getNextBreakPoint();
}
const { canvasContext, viewport, transform, background } = this.params;
this.gfx = new CanvasGraphics(
canvasContext,
this.commonObjs,
this.objs,
this.canvasFactory,
this.filterFactory,
{ optionalContentConfig },
this.annotationCanvasMap,
this.pageColors
);
this.gfx.beginDrawing({
transform,
viewport,
transparency,
background,
});
this.operatorListIdx = 0;
this.graphicsReady = true;
this.graphicsReadyCallback?.();
}
cancel(error = null, extraDelay = 0) {
this.running = false;
this.cancelled = true;
this.gfx?.endDrawing();
InternalRenderTask.#canvasInUse.delete(this._canvas);
this.callback(
error ||
new RenderingCancelledException(
`Rendering cancelled, page ${this._pageIndex + 1}`,
extraDelay
)
);
}
operatorListChanged() {
if (!this.graphicsReady) {
this.graphicsReadyCallback ||= this._continueBound;
return;
}
this.stepper?.updateOperatorList(this.operatorList);
if (this.running) {
return;
}
this._continue();
}
_continue() {
this.running = true;
if (this.cancelled) {
return;
}
if (this.task.onContinue) {
this.task.onContinue(this._scheduleNextBound);
} else {
this._scheduleNext();
}
}
_scheduleNext() {
if (this._useRequestAnimationFrame) {
window.requestAnimationFrame(() => {
this._nextBound().catch(this._cancelBound);
});
} else {
Promise.resolve().then(this._nextBound).catch(this._cancelBound);
}
}
async _next() {
if (this.cancelled) {
return;
}
this.operatorListIdx = this.gfx.executeOperatorList(
this.operatorList,
this.operatorListIdx,
this._continueBound,
this.stepper
);
if (this.operatorListIdx === this.operatorList.argsArray.length) {
this.running = false;
if (this.operatorList.lastChunk) {
this.gfx.endDrawing();
InternalRenderTask.#canvasInUse.delete(this._canvas);
this.callback();
}
}
}
}
/** @type {string} */
const version =
typeof PDFJSDev !== "undefined" ? PDFJSDev.eval("BUNDLE_VERSION") : null;
/** @type {string} */
const build =
typeof PDFJSDev !== "undefined" ? PDFJSDev.eval("BUNDLE_BUILD") : null;
export {
build,
DefaultCanvasFactory,
DefaultCMapReaderFactory,
DefaultFilterFactory,
DefaultStandardFontDataFactory,
getDocument,
LoopbackPort,
PDFDataRangeTransport,
PDFDocumentLoadingTask,
PDFDocumentProxy,
PDFPageProxy,
PDFWorker,
PDFWorkerUtil,
RenderTask,
version,
};