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Ensure all trailers security handlers are initialized at parsing time #161

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Ensure all trailers security handlers are initialized at parsing time #161

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16 changes: 10 additions & 6 deletions src/foundation/src/PDFsharp/src/PdfSharp/Pdf.IO/PdfReader.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -308,13 +308,17 @@ PdfDocument OpenFromStream(Stream stream, string? password, PdfDocumentOpenMode
// Reference.Values available by now: All trailers and cross-reference streams (which are not encrypted by definition).

// 2. Read the encryption dictionary, if existing.
if (_document.Trailer!.Elements[PdfTrailer.Keys.Encrypt] is PdfReference xrefEncrypt)
var trailer = _document.Trailer;
while (trailer != null)
{
var encrypt = parser.ReadIndirectObject(xrefEncrypt, null, true);
encrypt.Reference = xrefEncrypt;
xrefEncrypt.Value = encrypt;

_document.SecurityHandler.PrepareForReading();
if (_document.Trailer!.Elements[PdfTrailer.Keys.Encrypt] is PdfReference xrefEncrypt)
{
var encrypt = parser.ReadIndirectObject(xrefEncrypt, null, true);
encrypt.Reference = xrefEncrypt;
xrefEncrypt.Value = encrypt;

_document.SecurityHandler.PrepareForReading();
}
}
// References available by now: All references to file-level objects.
// Reference.Values available by now: All trailers and cross-reference streams and the encryption dictionary.
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