A couple of small improvements in the "SaveDocument" handler in src/core/worker.js
- Check that the "Info"-entry, in the XRef-trailer, is actually a dictionary before accessing it. This is similar to the `PDFDocument.documentInfo` method and follows the general principal of validating data carefully before accessing it, given how often PDF-software may create corrupt PDF files. - Slightly simplify the "XFA"-lookup, since there's no point in trying to fetch something from the empty dictionary.
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@ -32,7 +32,7 @@ import {
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VerbosityLevel,
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VerbosityLevel,
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warn,
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warn,
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} from "../shared/util.js";
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} from "../shared/util.js";
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import { clearPrimitiveCaches, Dict, isDict, Ref } from "./primitives.js";
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import { clearPrimitiveCaches, Dict, Ref } from "./primitives.js";
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import { LocalPdfManager, NetworkPdfManager } from "./pdf_manager.js";
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import { LocalPdfManager, NetworkPdfManager } from "./pdf_manager.js";
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import { incrementalUpdate } from "./writer.js";
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import { incrementalUpdate } from "./writer.js";
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import { isNodeJS } from "../shared/is_node.js";
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import { isNodeJS } from "../shared/is_node.js";
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@ -548,8 +548,7 @@ class WorkerMessageHandler {
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return stream.bytes;
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return stream.bytes;
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}
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}
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acroForm = isDict(acroForm) ? acroForm : Dict.empty;
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const xfa = (acroForm instanceof Dict && acroForm.get("XFA")) || [];
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const xfa = acroForm.get("XFA") || [];
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let xfaDatasets = null;
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let xfaDatasets = null;
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if (Array.isArray(xfa)) {
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if (Array.isArray(xfa)) {
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for (let i = 0, ii = xfa.length; i < ii; i += 2) {
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for (let i = 0, ii = xfa.length; i < ii; i += 2) {
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@ -568,7 +567,7 @@ class WorkerMessageHandler {
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// Get string info from Info in order to compute fileId
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// Get string info from Info in order to compute fileId
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const _info = Object.create(null);
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const _info = Object.create(null);
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const xrefInfo = xref.trailer.get("Info") || null;
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const xrefInfo = xref.trailer.get("Info") || null;
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if (xrefInfo) {
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if (xrefInfo instanceof Dict) {
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xrefInfo.forEach((key, value) => {
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xrefInfo.forEach((key, value) => {
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if (isString(key) && isString(value)) {
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if (isString(key) && isString(value)) {
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_info[key] = stringToPDFString(value);
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_info[key] = stringToPDFString(value);
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