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Restore a weaker version of the /Pages dictionary /Count check for corrupt documents (PR 15593 follow-up)

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It appears that PR 15593 broke `issue12402`, and we thus need to partially restore the /Count check.
 I completely missed this when looking at the test-results for PR 15593, both locally and on the bots, since the `Driver._getLastPageNumber` method would "swallow" an unavailable page number.
This commit is contained in:
Jonas Jenwald 2022-10-20 14:15:58 +02:00
parent 36967fcedb
commit e591378ff1
2 changed files with 7 additions and 6 deletions
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7
src/core/xref.js
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@ -582,6 +582,7 @@ class XRef {
continue;
}
// Do some basic validation of the trailer/root dictionary candidate.
let validPagesDict = false;
try {
const rootDict = dict.get("Root");
if (!(rootDict instanceof Dict)) {
@ -591,13 +592,17 @@ class XRef {
if (!(pagesDict instanceof Dict)) {
continue;
}
const pagesCount = pagesDict.get("Count");
if (Number.isInteger(pagesCount)) {
validPagesDict = true;
}
// The top-level /Pages dictionary isn't obviously corrupt.
} catch (ex) {
trailerError = ex;
continue;
}
// taking the first one with 'ID'
if (dict.has("ID")) {
if (validPagesDict && dict.has("ID")) {
return dict;
}
// The current dictionary is a candidate, but continue searching.