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Prevent circular references in the /Pages tree

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This commit is contained in:
Jonas Jenwald 2020-02-08 17:43:53 +01:00
parent e2b30e9e9c
commit 3c7b7be100
7 changed files with 155 additions and 8 deletions
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1
test/pdfs/.gitignore vendored
View file

@ -117,6 +117,7 @@
!bug1132849.pdf
!issue6894.pdf
!issue5804.pdf
!Pages-tree-refs.pdf
!ShowText-ShadingPattern.pdf
!complex_ttf_font.pdf
!issue3694_reduced.pdf

84
test/pdfs/Pages-tree-refs.pdf Normal file
View file

@ -0,0 +1,84 @@
%PDF-1.7
1 0 obj
<< /Type /Catalog
/Pages 2 0 R
>>
endobj
2 0 obj
<< /Type /Pages
/Kids [6 0 R 3 0 R]
/Count 2
/MediaBox [0 0 595 842]
>>
endobj
3 0 obj
<< /Type /Pages
/Kids [4 0 R]
/Count 1
/MediaBox [0 0 595 842]
>>
endobj
4 0 obj
<< /Type /Pages
/Kids [5 0 R]
/Count 1
/MediaBox [0 0 595 842]
>>
endobj
5 0 obj
<< /Type /Pages
/Kids [3 0 R]
/Count 1
/MediaBox [0 0 595 842]
>>
endobj
6 0 obj
<< /Type /Page
/Parent 2 0 R
/Resources
<< /Font
<< /F1
<< /Type /Font
/Subtype /Type1
/BaseFont /Courier
>>
>>
>>
/Contents [7 0 R]
>>
endobj
7 0 obj
<< /Length 69 >>
stream
BT
/F1 22 Tf
30 800 Td
(Testcase: 'Pages loop') Tj
ET
endstream
endobj
xref
0 8
0000000000 65535 f
0000000010 00000 n
0000000069 00000 n
0000000176 00000 n
0000000277 00000 n
0000000378 00000 n
0000000479 00000 n
0000000744 00000 n
trailer
<< /Root 1 0 R
/Size 8
>>
startxref
866
%%EOF

37
test/unit/api_spec.js
View file

@ -546,6 +546,43 @@ describe("api", function() {
})
.catch(done.fail);
});
it("gets page, from /Pages tree with circular reference", function(done) {
const loadingTask = getDocument(
buildGetDocumentParams("Pages-tree-refs.pdf")
);
const page1 = loadingTask.promise.then(function(pdfDoc) {
return pdfDoc.getPage(1).then(
function(pdfPage) {
expect(pdfPage instanceof PDFPageProxy).toEqual(true);
expect(pdfPage.ref).toEqual({ num: 6, gen: 0 });
},
function(reason) {
throw new Error("shall not fail for valid page");
}
);
});
const page2 = loadingTask.promise.then(function(pdfDoc) {
return pdfDoc.getPage(2).then(
function(pdfPage) {
throw new Error("shall fail for invalid page");
},
function(reason) {
expect(reason instanceof Error).toEqual(true);
expect(reason.message).toEqual(
"Pages tree contains circular reference."
);
}
);
});
Promise.all([page1, page2]).then(function() {
loadingTask.destroy().then(done);
}, done.fail);
});
it("gets page index", function(done) {
// reference to second page
var ref = { num: 17, gen: 0 };