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Add more validation to PDFLinkService_navigateTo

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In some PDF files, the first element (i.e. the one containing either a `Ref` or a `Number` pointing to a page) of the explicit destination Array may be bogus.

One such example is actually the file `pdf.pdf` in the test-suite, where some destinations are incompletely specified. One such example being the `G1.998360` destination whose explicit destination Array contains `[null, /XYZ, 54, 488, null]`, i.e. the destination page is `null`.
Hence this patch adds a bit more validation for that case. It also adds an additional check to ensure that the resulting `pageNumber` is non-negative, and finally a couple more error messages for existing cases of malformed data.
This commit is contained in:
Jonas Jenwald 2016-10-22 18:08:25 +02:00
parent d5e3b2fbf0
commit e1412de320
1 changed files with 28 additions and 11 deletions
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39
web/pdf_link_service.js
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@ -106,13 +106,21 @@ var PDFLinkService = (function PDFLinkServiceClosure() {
var goToDestination = function(destRef) {
// dest array looks like that: <page-ref> </XYZ|/FitXXX> <args..>
var pageNumber = destRef instanceof Object ?
self._pagesRefCache[destRef.num + ' ' + destRef.gen + ' R'] :
(destRef + 1);
var pageNumber;
if (destRef instanceof Object) {
pageNumber = self._cachedPageNumber(destRef);
} else if ((destRef | 0) === destRef) { // Integer
pageNumber = destRef + 1;
} else {
console.error('PDFLinkService_navigateTo: "' + destRef +
'" is not a valid destination reference.');
return;
}
if (pageNumber) {
if (pageNumber > self.pagesCount) {
console.error('PDFLinkService_navigateTo: ' +
'Trying to navigate to a non-existent page.');
if (pageNumber < 1 || pageNumber > self.pagesCount) {
console.error('PDFLinkService_navigateTo: "' + pageNumber +
'" is a non-existent page number.');
return;
}
self.pdfViewer.scrollPageIntoView({
@ -130,10 +138,12 @@ var PDFLinkService = (function PDFLinkServiceClosure() {
}
} else {
self.pdfDocument.getPageIndex(destRef).then(function (pageIndex) {
var pageNum = pageIndex + 1;
var cacheKey = destRef.num + ' ' + destRef.gen + ' R';
self._pagesRefCache[cacheKey] = pageNum;
self.cachePageRef(pageIndex + 1, destRef);
goToDestination(destRef);
}).catch(function () {
console.error('PDFLinkService_navigateTo: "' + destRef +
'" is not a valid page reference.');
return;
});
}
};
@ -148,7 +158,9 @@ var PDFLinkService = (function PDFLinkServiceClosure() {
destinationPromise.then(function(destination) {
dest = destination;
if (!(destination instanceof Array)) {
return; // invalid destination
console.error('PDFLinkService_navigateTo: "' + destination +
'" is not a valid destination array.');
return;
}
goToDestination(destination[0]);
});
@ -333,7 +345,12 @@ var PDFLinkService = (function PDFLinkServiceClosure() {
cachePageRef: function PDFLinkService_cachePageRef(pageNum, pageRef) {
var refStr = pageRef.num + ' ' + pageRef.gen + ' R';
this._pagesRefCache[refStr] = pageNum;
}
},
_cachedPageNumber: function PDFLinkService_cachedPageNumber(pageRef) {
var refStr = pageRef.num + ' ' + pageRef.gen + ' R';
return (this._pagesRefCache && this._pagesRefCache[refStr]) || null;
},
};
function isValidExplicitDestination(dest) {