88c35d872f
While it would be nice to change the `PDFFormatVersion` property, as returned through `PDFDocumentProxy.getMetadata`, to a number (rather than a string) that would unfortunately be a breaking API change. However, it does seem like a good idea to at least *validate* the PDF header version on the worker-thread, rather than potentially returning an arbitrary string.
842 lines
23 KiB
JavaScript
842 lines
23 KiB
JavaScript
/* Copyright 2012 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* eslint no-var: error */
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import {
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assert,
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FormatError,
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info,
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InvalidPDFException,
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isArrayBuffer,
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isArrayEqual,
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isBool,
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isNum,
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isString,
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OPS,
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shadow,
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stringToBytes,
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stringToPDFString,
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Util,
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warn,
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} from "../shared/util.js";
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import { Catalog, ObjectLoader, XRef } from "./obj.js";
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import {
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clearPrimitiveCaches,
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Dict,
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isDict,
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isName,
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isStream,
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Ref,
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} from "./primitives.js";
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import {
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getInheritableProperty,
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isSpace,
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MissingDataException,
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XRefEntryException,
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XRefParseException,
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} from "./core_utils.js";
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import { NullStream, Stream, StreamsSequenceStream } from "./stream.js";
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import { AnnotationFactory } from "./annotation.js";
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import { calculateMD5 } from "./crypto.js";
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import { Linearization } from "./parser.js";
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import { OperatorList } from "./operator_list.js";
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import { PartialEvaluator } from "./evaluator.js";
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import { PDFFunctionFactory } from "./function.js";
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const DEFAULT_USER_UNIT = 1.0;
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const LETTER_SIZE_MEDIABOX = [0, 0, 612, 792];
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function isAnnotationRenderable(annotation, intent) {
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return (
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(intent === "display" && annotation.viewable) ||
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(intent === "print" && annotation.printable)
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);
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}
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class Page {
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constructor({
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pdfManager,
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xref,
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pageIndex,
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pageDict,
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ref,
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fontCache,
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builtInCMapCache,
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pdfFunctionFactory,
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}) {
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this.pdfManager = pdfManager;
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this.pageIndex = pageIndex;
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this.pageDict = pageDict;
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this.xref = xref;
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this.ref = ref;
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this.fontCache = fontCache;
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this.builtInCMapCache = builtInCMapCache;
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this.pdfFunctionFactory = pdfFunctionFactory;
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this.evaluatorOptions = pdfManager.evaluatorOptions;
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this.resourcesPromise = null;
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const idCounters = {
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obj: 0,
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};
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this.idFactory = {
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createObjId() {
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return `p${pageIndex}_${++idCounters.obj}`;
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},
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getDocId() {
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return `g_${pdfManager.docId}`;
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},
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};
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}
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/**
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* @private
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*/
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_getInheritableProperty(key, getArray = false) {
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const value = getInheritableProperty({
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dict: this.pageDict,
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key,
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getArray,
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stopWhenFound: false,
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});
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if (!Array.isArray(value)) {
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return value;
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}
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if (value.length === 1 || !isDict(value[0])) {
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return value[0];
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}
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return Dict.merge(this.xref, value);
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}
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get content() {
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return this.pageDict.get("Contents");
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}
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get resources() {
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// For robustness: The spec states that a \Resources entry has to be
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// present, but can be empty. Some documents still omit it; in this case
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// we return an empty dictionary.
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return shadow(
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this,
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"resources",
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this._getInheritableProperty("Resources") || Dict.empty
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);
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}
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_getBoundingBox(name) {
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const box = this._getInheritableProperty(name, /* getArray = */ true);
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if (Array.isArray(box) && box.length === 4) {
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if (box[2] - box[0] !== 0 && box[3] - box[1] !== 0) {
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return box;
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}
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warn(`Empty /${name} entry.`);
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}
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return null;
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}
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get mediaBox() {
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// Reset invalid media box to letter size.
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return shadow(
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this,
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"mediaBox",
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this._getBoundingBox("MediaBox") || LETTER_SIZE_MEDIABOX
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);
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}
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get cropBox() {
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// Reset invalid crop box to media box.
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return shadow(
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this,
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"cropBox",
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this._getBoundingBox("CropBox") || this.mediaBox
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);
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}
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get userUnit() {
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let obj = this.pageDict.get("UserUnit");
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if (!isNum(obj) || obj <= 0) {
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obj = DEFAULT_USER_UNIT;
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}
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return shadow(this, "userUnit", obj);
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}
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get view() {
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// From the spec, 6th ed., p.963:
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// "The crop, bleed, trim, and art boxes should not ordinarily
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// extend beyond the boundaries of the media box. If they do, they are
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// effectively reduced to their intersection with the media box."
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const { cropBox, mediaBox } = this;
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let view;
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if (cropBox === mediaBox || isArrayEqual(cropBox, mediaBox)) {
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view = mediaBox;
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} else {
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const box = Util.intersect(cropBox, mediaBox);
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if (box && box[2] - box[0] !== 0 && box[3] - box[1] !== 0) {
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view = box;
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} else {
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warn("Empty /CropBox and /MediaBox intersection.");
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}
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}
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return shadow(this, "view", view || mediaBox);
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}
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get rotate() {
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let rotate = this._getInheritableProperty("Rotate") || 0;
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// Normalize rotation so it's a multiple of 90 and between 0 and 270.
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if (rotate % 90 !== 0) {
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rotate = 0;
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} else if (rotate >= 360) {
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rotate = rotate % 360;
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} else if (rotate < 0) {
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// The spec doesn't cover negatives. Assume it's counterclockwise
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// rotation. The following is the other implementation of modulo.
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rotate = ((rotate % 360) + 360) % 360;
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}
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return shadow(this, "rotate", rotate);
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}
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getContentStream() {
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const content = this.content;
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let stream;
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if (Array.isArray(content)) {
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// Fetching the individual streams from the array.
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const xref = this.xref;
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const streams = [];
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for (const stream of content) {
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streams.push(xref.fetchIfRef(stream));
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}
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stream = new StreamsSequenceStream(streams);
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} else if (isStream(content)) {
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stream = content;
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} else {
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// Replace non-existent page content with empty content.
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stream = new NullStream();
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}
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return stream;
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}
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loadResources(keys) {
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if (!this.resourcesPromise) {
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// TODO: add async `_getInheritableProperty` and remove this.
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this.resourcesPromise = this.pdfManager.ensure(this, "resources");
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}
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return this.resourcesPromise.then(() => {
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const objectLoader = new ObjectLoader(this.resources, keys, this.xref);
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return objectLoader.load();
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});
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}
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getOperatorList({ handler, sink, task, intent, renderInteractiveForms }) {
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const contentStreamPromise = this.pdfManager.ensure(
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this,
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"getContentStream"
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);
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const resourcesPromise = this.loadResources([
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"ExtGState",
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"ColorSpace",
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"Pattern",
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"Shading",
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"XObject",
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"Font",
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]);
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const partialEvaluator = new PartialEvaluator({
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xref: this.xref,
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handler,
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pageIndex: this.pageIndex,
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idFactory: this.idFactory,
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fontCache: this.fontCache,
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builtInCMapCache: this.builtInCMapCache,
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options: this.evaluatorOptions,
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pdfFunctionFactory: this.pdfFunctionFactory,
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});
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const dataPromises = Promise.all([contentStreamPromise, resourcesPromise]);
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const pageListPromise = dataPromises.then(([contentStream]) => {
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const opList = new OperatorList(intent, sink, this.pageIndex);
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handler.send("StartRenderPage", {
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transparency: partialEvaluator.hasBlendModes(this.resources),
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pageIndex: this.pageIndex,
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intent,
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});
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return partialEvaluator
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.getOperatorList({
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stream: contentStream,
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task,
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resources: this.resources,
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operatorList: opList,
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})
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.then(function() {
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return opList;
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});
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});
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// Fetch the page's annotations and add their operator lists to the
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// page's operator list to render them.
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return Promise.all([pageListPromise, this._parsedAnnotations]).then(
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function([pageOpList, annotations]) {
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if (annotations.length === 0) {
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pageOpList.flush(true);
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return { length: pageOpList.totalLength };
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}
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// Collect the operator list promises for the annotations. Each promise
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// is resolved with the complete operator list for a single annotation.
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const opListPromises = [];
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for (const annotation of annotations) {
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if (isAnnotationRenderable(annotation, intent)) {
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opListPromises.push(
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annotation.getOperatorList(
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partialEvaluator,
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task,
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renderInteractiveForms
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)
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);
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}
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}
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return Promise.all(opListPromises).then(function(opLists) {
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pageOpList.addOp(OPS.beginAnnotations, []);
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for (const opList of opLists) {
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pageOpList.addOpList(opList);
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}
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pageOpList.addOp(OPS.endAnnotations, []);
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pageOpList.flush(true);
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return { length: pageOpList.totalLength };
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});
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}
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);
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}
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extractTextContent({
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handler,
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task,
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normalizeWhitespace,
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sink,
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combineTextItems,
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}) {
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const contentStreamPromise = this.pdfManager.ensure(
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this,
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"getContentStream"
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);
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const resourcesPromise = this.loadResources([
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"ExtGState",
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"XObject",
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"Font",
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]);
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const dataPromises = Promise.all([contentStreamPromise, resourcesPromise]);
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return dataPromises.then(([contentStream]) => {
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const partialEvaluator = new PartialEvaluator({
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xref: this.xref,
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handler,
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pageIndex: this.pageIndex,
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idFactory: this.idFactory,
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fontCache: this.fontCache,
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builtInCMapCache: this.builtInCMapCache,
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options: this.evaluatorOptions,
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pdfFunctionFactory: this.pdfFunctionFactory,
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});
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return partialEvaluator.getTextContent({
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stream: contentStream,
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task,
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resources: this.resources,
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normalizeWhitespace,
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combineTextItems,
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sink,
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});
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});
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}
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getAnnotationsData(intent) {
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return this._parsedAnnotations.then(function(annotations) {
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const annotationsData = [];
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for (let i = 0, ii = annotations.length; i < ii; i++) {
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if (!intent || isAnnotationRenderable(annotations[i], intent)) {
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annotationsData.push(annotations[i].data);
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}
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}
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return annotationsData;
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});
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}
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get annotations() {
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return shadow(
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this,
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"annotations",
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this._getInheritableProperty("Annots") || []
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);
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}
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get _parsedAnnotations() {
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const parsedAnnotations = this.pdfManager
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.ensure(this, "annotations")
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.then(() => {
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const annotationRefs = this.annotations;
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const annotationPromises = [];
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for (let i = 0, ii = annotationRefs.length; i < ii; i++) {
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annotationPromises.push(
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AnnotationFactory.create(
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this.xref,
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annotationRefs[i],
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this.pdfManager,
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this.idFactory
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)
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);
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}
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return Promise.all(annotationPromises).then(
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function(annotations) {
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return annotations.filter(function isDefined(annotation) {
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return !!annotation;
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});
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},
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function(reason) {
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warn(`_parsedAnnotations: "${reason}".`);
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return [];
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}
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);
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});
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return shadow(this, "_parsedAnnotations", parsedAnnotations);
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}
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}
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const PDF_HEADER_SIGNATURE = new Uint8Array([0x25, 0x50, 0x44, 0x46, 0x2d]);
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// prettier-ignore
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const STARTXREF_SIGNATURE = new Uint8Array([
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0x73, 0x74, 0x61, 0x72, 0x74, 0x78, 0x72, 0x65, 0x66]);
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const ENDOBJ_SIGNATURE = new Uint8Array([0x65, 0x6e, 0x64, 0x6f, 0x62, 0x6a]);
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const FINGERPRINT_FIRST_BYTES = 1024;
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const EMPTY_FINGERPRINT =
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
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const PDF_HEADER_VERSION_REGEXP = /^[1-9]\.[0-9]$/;
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function find(stream, signature, limit = 1024, backwards = false) {
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if (
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typeof PDFJSDev === "undefined" ||
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PDFJSDev.test("!PRODUCTION || TESTING")
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) {
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assert(limit > 0, 'The "limit" must be a positive integer.');
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}
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const signatureLength = signature.length;
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const scanBytes = stream.peekBytes(limit);
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const scanLength = scanBytes.length - signatureLength;
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if (scanLength <= 0) {
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return false;
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}
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if (backwards) {
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const signatureEnd = signatureLength - 1;
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let pos = scanBytes.length - 1;
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while (pos >= signatureEnd) {
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let j = 0;
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while (
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j < signatureLength &&
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scanBytes[pos - j] === signature[signatureEnd - j]
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) {
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j++;
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}
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if (j >= signatureLength) {
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// `signature` found.
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stream.pos += pos - signatureEnd;
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return true;
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}
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pos--;
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}
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} else {
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// forwards
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let pos = 0;
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while (pos <= scanLength) {
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let j = 0;
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while (j < signatureLength && scanBytes[pos + j] === signature[j]) {
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j++;
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}
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if (j >= signatureLength) {
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// `signature` found.
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stream.pos += pos;
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return true;
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}
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pos++;
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}
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}
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return false;
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}
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|
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/**
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* The `PDFDocument` class holds all the (worker-thread) data of the PDF file.
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*/
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|
class PDFDocument {
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|
constructor(pdfManager, arg) {
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let stream;
|
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if (isStream(arg)) {
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stream = arg;
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} else if (isArrayBuffer(arg)) {
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stream = new Stream(arg);
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} else {
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throw new Error("PDFDocument: Unknown argument type");
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}
|
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if (stream.length <= 0) {
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throw new InvalidPDFException(
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"The PDF file is empty, i.e. its size is zero bytes."
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);
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}
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|
|
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this.pdfManager = pdfManager;
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|
this.stream = stream;
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this.xref = new XRef(stream, pdfManager);
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|
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this.pdfFunctionFactory = new PDFFunctionFactory({
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xref: this.xref,
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isEvalSupported: pdfManager.evaluatorOptions.isEvalSupported,
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});
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this._pagePromises = [];
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}
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|
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parse(recoveryMode) {
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|
this.setup(recoveryMode);
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|
|
|
const version = this.catalog.catDict.get("Version");
|
|
if (isName(version)) {
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this.pdfFormatVersion = version.name;
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|
}
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|
|
|
// Check if AcroForms are present in the document.
|
|
try {
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|
this.acroForm = this.catalog.catDict.get("AcroForm");
|
|
if (this.acroForm) {
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|
this.xfa = this.acroForm.get("XFA");
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|
const fields = this.acroForm.get("Fields");
|
|
if ((!Array.isArray(fields) || fields.length === 0) && !this.xfa) {
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this.acroForm = null; // No fields and no XFA, so it's not a form.
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}
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}
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} catch (ex) {
|
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if (ex instanceof MissingDataException) {
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throw ex;
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}
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info("Cannot fetch AcroForm entry; assuming no AcroForms are present");
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this.acroForm = null;
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}
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|
|
// Check if a Collection dictionary is present in the document.
|
|
try {
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|
const collection = this.catalog.catDict.get("Collection");
|
|
if (isDict(collection) && collection.getKeys().length > 0) {
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|
this.collection = collection;
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|
}
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|
} catch (ex) {
|
|
if (ex instanceof MissingDataException) {
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throw ex;
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|
}
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|
info("Cannot fetch Collection dictionary.");
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|
}
|
|
}
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|
|
get linearization() {
|
|
let linearization = null;
|
|
try {
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|
linearization = Linearization.create(this.stream);
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|
} catch (err) {
|
|
if (err instanceof MissingDataException) {
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throw err;
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|
}
|
|
info(err);
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|
}
|
|
return shadow(this, "linearization", linearization);
|
|
}
|
|
|
|
get startXRef() {
|
|
const stream = this.stream;
|
|
let startXRef = 0;
|
|
|
|
if (this.linearization) {
|
|
// Find the end of the first object.
|
|
stream.reset();
|
|
if (find(stream, ENDOBJ_SIGNATURE)) {
|
|
startXRef = stream.pos + 6 - stream.start;
|
|
}
|
|
} else {
|
|
// Find `startxref` by checking backwards from the end of the file.
|
|
const step = 1024;
|
|
const startXRefLength = STARTXREF_SIGNATURE.length;
|
|
let found = false,
|
|
pos = stream.end;
|
|
|
|
while (!found && pos > 0) {
|
|
pos -= step - startXRefLength;
|
|
if (pos < 0) {
|
|
pos = 0;
|
|
}
|
|
stream.pos = pos;
|
|
found = find(stream, STARTXREF_SIGNATURE, step, true);
|
|
}
|
|
|
|
if (found) {
|
|
stream.skip(9);
|
|
let ch;
|
|
do {
|
|
ch = stream.getByte();
|
|
} while (isSpace(ch));
|
|
let str = "";
|
|
while (ch >= /* Space = */ 0x20 && ch <= /* '9' = */ 0x39) {
|
|
str += String.fromCharCode(ch);
|
|
ch = stream.getByte();
|
|
}
|
|
startXRef = parseInt(str, 10);
|
|
if (isNaN(startXRef)) {
|
|
startXRef = 0;
|
|
}
|
|
}
|
|
}
|
|
return shadow(this, "startXRef", startXRef);
|
|
}
|
|
|
|
// Find the header, get the PDF format version and setup the
|
|
// stream to start from the header.
|
|
checkHeader() {
|
|
const stream = this.stream;
|
|
stream.reset();
|
|
|
|
if (!find(stream, PDF_HEADER_SIGNATURE)) {
|
|
// May not be a PDF file, but don't throw an error and let
|
|
// parsing continue.
|
|
return;
|
|
}
|
|
stream.moveStart();
|
|
|
|
// Read the PDF format version.
|
|
const MAX_PDF_VERSION_LENGTH = 12;
|
|
let version = "",
|
|
ch;
|
|
while ((ch = stream.getByte()) > /* Space = */ 0x20) {
|
|
if (version.length >= MAX_PDF_VERSION_LENGTH) {
|
|
break;
|
|
}
|
|
version += String.fromCharCode(ch);
|
|
}
|
|
if (!this.pdfFormatVersion) {
|
|
// Remove the "%PDF-" prefix.
|
|
this.pdfFormatVersion = version.substring(5);
|
|
}
|
|
}
|
|
|
|
parseStartXRef() {
|
|
this.xref.setStartXRef(this.startXRef);
|
|
}
|
|
|
|
setup(recoveryMode) {
|
|
this.xref.parse(recoveryMode);
|
|
this.catalog = new Catalog(this.pdfManager, this.xref);
|
|
}
|
|
|
|
get numPages() {
|
|
const linearization = this.linearization;
|
|
const num = linearization ? linearization.numPages : this.catalog.numPages;
|
|
return shadow(this, "numPages", num);
|
|
}
|
|
|
|
get documentInfo() {
|
|
const DocumentInfoValidators = {
|
|
Title: isString,
|
|
Author: isString,
|
|
Subject: isString,
|
|
Keywords: isString,
|
|
Creator: isString,
|
|
Producer: isString,
|
|
CreationDate: isString,
|
|
ModDate: isString,
|
|
Trapped: isName,
|
|
};
|
|
|
|
let version = this.pdfFormatVersion;
|
|
if (
|
|
typeof version !== "string" ||
|
|
!PDF_HEADER_VERSION_REGEXP.test(version)
|
|
) {
|
|
warn(`Invalid PDF header version number: ${version}`);
|
|
version = null;
|
|
}
|
|
|
|
const docInfo = {
|
|
PDFFormatVersion: version,
|
|
IsLinearized: !!this.linearization,
|
|
IsAcroFormPresent: !!this.acroForm,
|
|
IsXFAPresent: !!this.xfa,
|
|
IsCollectionPresent: !!this.collection,
|
|
};
|
|
|
|
let infoDict;
|
|
try {
|
|
infoDict = this.xref.trailer.get("Info");
|
|
} catch (err) {
|
|
if (err instanceof MissingDataException) {
|
|
throw err;
|
|
}
|
|
info("The document information dictionary is invalid.");
|
|
}
|
|
|
|
if (isDict(infoDict)) {
|
|
// Fill the document info with valid entries from the specification,
|
|
// as well as any existing well-formed custom entries.
|
|
for (const key of infoDict.getKeys()) {
|
|
const value = infoDict.get(key);
|
|
|
|
if (DocumentInfoValidators[key]) {
|
|
// Make sure the (standard) value conforms to the specification.
|
|
if (DocumentInfoValidators[key](value)) {
|
|
docInfo[key] =
|
|
typeof value !== "string" ? value : stringToPDFString(value);
|
|
} else {
|
|
info(`Bad value in document info for "${key}".`);
|
|
}
|
|
} else if (typeof key === "string") {
|
|
// For custom values, only accept white-listed types to prevent
|
|
// errors that would occur when trying to send non-serializable
|
|
// objects to the main-thread (for example `Dict` or `Stream`).
|
|
let customValue;
|
|
if (isString(value)) {
|
|
customValue = stringToPDFString(value);
|
|
} else if (isName(value) || isNum(value) || isBool(value)) {
|
|
customValue = value;
|
|
} else {
|
|
info(`Unsupported value in document info for (custom) "${key}".`);
|
|
continue;
|
|
}
|
|
|
|
if (!docInfo["Custom"]) {
|
|
docInfo["Custom"] = Object.create(null);
|
|
}
|
|
docInfo["Custom"][key] = customValue;
|
|
}
|
|
}
|
|
}
|
|
return shadow(this, "documentInfo", docInfo);
|
|
}
|
|
|
|
get fingerprint() {
|
|
let hash;
|
|
const idArray = this.xref.trailer.get("ID");
|
|
if (
|
|
Array.isArray(idArray) &&
|
|
idArray[0] &&
|
|
isString(idArray[0]) &&
|
|
idArray[0] !== EMPTY_FINGERPRINT
|
|
) {
|
|
hash = stringToBytes(idArray[0]);
|
|
} else {
|
|
hash = calculateMD5(
|
|
this.stream.getByteRange(0, FINGERPRINT_FIRST_BYTES),
|
|
0,
|
|
FINGERPRINT_FIRST_BYTES
|
|
);
|
|
}
|
|
|
|
const fingerprintBuf = [];
|
|
for (let i = 0, ii = hash.length; i < ii; i++) {
|
|
const hex = hash[i].toString(16);
|
|
fingerprintBuf.push(hex.padStart(2, "0"));
|
|
}
|
|
return shadow(this, "fingerprint", fingerprintBuf.join(""));
|
|
}
|
|
|
|
_getLinearizationPage(pageIndex) {
|
|
const { catalog, linearization } = this;
|
|
assert(linearization && linearization.pageFirst === pageIndex);
|
|
|
|
const ref = Ref.get(linearization.objectNumberFirst, 0);
|
|
return this.xref
|
|
.fetchAsync(ref)
|
|
.then(obj => {
|
|
// Ensure that the object that was found is actually a Page dictionary.
|
|
if (
|
|
isDict(obj, "Page") ||
|
|
(isDict(obj) && !obj.has("Type") && obj.has("Contents"))
|
|
) {
|
|
if (ref && !catalog.pageKidsCountCache.has(ref)) {
|
|
catalog.pageKidsCountCache.put(ref, 1); // Cache the Page reference.
|
|
}
|
|
return [obj, ref];
|
|
}
|
|
throw new FormatError(
|
|
"The Linearization dictionary doesn't point " +
|
|
"to a valid Page dictionary."
|
|
);
|
|
})
|
|
.catch(reason => {
|
|
info(reason);
|
|
return catalog.getPageDict(pageIndex);
|
|
});
|
|
}
|
|
|
|
getPage(pageIndex) {
|
|
if (this._pagePromises[pageIndex] !== undefined) {
|
|
return this._pagePromises[pageIndex];
|
|
}
|
|
const { catalog, linearization } = this;
|
|
|
|
const promise =
|
|
linearization && linearization.pageFirst === pageIndex
|
|
? this._getLinearizationPage(pageIndex)
|
|
: catalog.getPageDict(pageIndex);
|
|
|
|
return (this._pagePromises[pageIndex] = promise.then(([pageDict, ref]) => {
|
|
return new Page({
|
|
pdfManager: this.pdfManager,
|
|
xref: this.xref,
|
|
pageIndex,
|
|
pageDict,
|
|
ref,
|
|
fontCache: catalog.fontCache,
|
|
builtInCMapCache: catalog.builtInCMapCache,
|
|
pdfFunctionFactory: this.pdfFunctionFactory,
|
|
});
|
|
}));
|
|
}
|
|
|
|
checkFirstPage() {
|
|
return this.getPage(0).catch(async reason => {
|
|
if (reason instanceof XRefEntryException) {
|
|
// Clear out the various caches to ensure that we haven't stored any
|
|
// inconsistent and/or incorrect state, since that could easily break
|
|
// subsequent `this.getPage` calls.
|
|
this._pagePromises.length = 0;
|
|
await this.cleanup();
|
|
|
|
throw new XRefParseException();
|
|
}
|
|
});
|
|
}
|
|
|
|
fontFallback(id, handler) {
|
|
return this.catalog.fontFallback(id, handler);
|
|
}
|
|
|
|
async cleanup() {
|
|
return this.catalog ? this.catalog.cleanup() : clearPrimitiveCaches();
|
|
}
|
|
}
|
|
|
|
export { Page, PDFDocument };
|