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support missing object numbers when brute-forcing

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the file 10404 (ironically) contains not found references with number 43 0
for its info dictionary. changes brute-force code so that objects can be
entirely missing
This commit is contained in:
EliotJones
2025-09-13 16:27:09 +02:00
parent c57cd5008b
commit 853ce8b93e
1 changed files with 11 additions and 5 deletions
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16
src/UglyToad.PdfPig/Tokenization/Scanner/PdfTokenScanner.cs
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@@ -770,7 +770,8 @@
if (!MoveNext()) if (!MoveNext())
{ {
return BruteForceFileToFindReference(reference); TryBruteForceFileToFindReference(reference, out var bfObjectToken);
return bfObjectToken;
} }
var found = (ObjectToken)CurrentToken!; var found = (ObjectToken)CurrentToken!;
@@ -780,7 +781,9 @@
return found; return found;
} }
return BruteForceFileToFindReference(reference); TryBruteForceFileToFindReference(reference, out var bfToken);
return bfToken;
} }
public void ReplaceToken(IndirectReference reference, IToken token) public void ReplaceToken(IndirectReference reference, IToken token)
@@ -790,8 +793,9 @@
overwrittenTokens[reference] = new ObjectToken(0, reference, token); overwrittenTokens[reference] = new ObjectToken(0, reference, token);
} }
private ObjectToken BruteForceFileToFindReference(IndirectReference reference) private bool TryBruteForceFileToFindReference(IndirectReference reference, [NotNullWhen(true)] out ObjectToken? result)
{ {
result = null;
try try
{ {
// Brute force read the entire file // Brute force read the entire file
@@ -806,10 +810,12 @@
if (!objectLocationProvider.TryGetCached(reference, out var objectToken)) if (!objectLocationProvider.TryGetCached(reference, out var objectToken))
{ {
throw new PdfDocumentFormatException($"Could not locate object with reference: {reference} despite a full document search."); return false;
} }
return objectToken; result = objectToken;
return true;
} }
finally finally
{ {