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Prevent lookup errors in PartialEvaluator.hasBlendModes from breaking all parsing/rendering of a page (issue 11678)

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The PDF document in question is *corrupt*, since it contains an XObject with a truncated dictionary and where the stream contents start without a "stream" operator.
This commit is contained in:
Jonas Jenwald 2020-03-09 11:37:33 +01:00
parent 7b07b88e71
commit 65e6ea2cb2
3 changed files with 53 additions and 3 deletions
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46
src/core/evaluator.js
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@ -61,6 +61,7 @@ import {
WinAnsiEncoding,
ZapfDingbatsEncoding,
} from "./encodings.js";
import { getLookupTableFactory, MissingDataException } from "./core_utils.js";
import {
getNormalizedUnicodes,
getUnicodeForGlyph,
@ -77,7 +78,6 @@ import { bidi } from "./bidi.js";
import { ColorSpace } from "./colorspace.js";
import { DecodeStream } from "./stream.js";
import { getGlyphsUnicode } from "./glyphlist.js";
import { getLookupTableFactory } from "./core_utils.js";
import { getMetrics } from "./metrics.js";
import { isPDFFunction } from "./function.js";
import { JpegStream } from "./jpeg_stream.js";
@ -266,7 +266,27 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
if (processed[graphicState.toString()]) {
continue; // The ExtGState has already been processed.
}
graphicState = xref.fetch(graphicState);
try {
graphicState = xref.fetch(graphicState);
} catch (ex) {
if (ex instanceof MissingDataException) {
throw ex;
}
if (this.options.ignoreErrors) {
if (graphicState instanceof Ref) {
// Avoid parsing a corrupt ExtGState more than once.
processed[graphicState.toString()] = true;
}
// Error(s) in the ExtGState -- sending unsupported feature
// notification and allow parsing/rendering to continue.
this.handler.send("UnsupportedFeature", {
featureId: UNSUPPORTED_FEATURES.unknown,
});
warn(`hasBlendModes - ignoring ExtGState: "${ex}".`);
continue;
}
throw ex;
}
}
if (!(graphicState instanceof Dict)) {
continue;
@ -308,7 +328,27 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
// time for badly generated PDF files (fixes issue6961.pdf).
continue;
}
xObject = xref.fetch(xObject);
try {
xObject = xref.fetch(xObject);
} catch (ex) {
if (ex instanceof MissingDataException) {
throw ex;
}
if (this.options.ignoreErrors) {
if (xObject instanceof Ref) {
// Avoid parsing a corrupt XObject more than once.
processed[xObject.toString()] = true;
}
// Error(s) in the XObject -- sending unsupported feature
// notification and allow parsing/rendering to continue.
this.handler.send("UnsupportedFeature", {
featureId: UNSUPPORTED_FEATURES.unknown,
});
warn(`hasBlendModes - ignoring XObject: "${ex}".`);
continue;
}
throw ex;
}
}
if (!isStream(xObject)) {
continue;