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Ignore invalid /CIDToGIDMap-entries when parsing fonts (issue 15139)

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In the referenced PDF document the fonts have /CIDToGIDMap-entries that cannot be loaded. Hence, only when `ignoreErrors` is set, we'll now ignore these corrupt /CIDToGIDMap-entries and fallback to simply assume that no such data is available.

Given that this is *clearly* a case of a corrupt PDF document, there's no guarantee that this will "fix" things in the general case since a /CIDToGIDMap may be *required* in order for some composite fonts to render correctly. However, attempting to render *something* is surely better than skipping a font altogether.
This commit is contained in:
Jonas Jenwald 2022-07-13 10:06:16 +02:00
parent 7a4b72ed11
commit 60bd9580e2
3 changed files with 19 additions and 3 deletions
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13
src/core/evaluator.js
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@ -3373,9 +3373,16 @@ class PartialEvaluator {
};
}
const cidToGidMap = dict.get("CIDToGIDMap");
if (cidToGidMap instanceof BaseStream) {
cidToGidBytes = cidToGidMap.getBytes();
try {
const cidToGidMap = dict.get("CIDToGIDMap");
if (cidToGidMap instanceof BaseStream) {
cidToGidBytes = cidToGidMap.getBytes();
}
} catch (ex) {
if (!this.options.ignoreErrors) {
throw ex;
}
warn(`extractDataStructures - ignoring CIDToGIDMap data: "${ex}".`);
}
}