xmlsecurity PDF sign: conditionally write xref stream
In case the input document used a PDF 1.5 xref stream, not an old xref table, then write that as part of the incremental update. Acrobat seems to require this. Change-Id: I9f1f73140c26308f8720aa1ffe1b905d0e60ede0 Reviewed-on: https://gerrit.libreoffice.org/30724 Tested-by: Jenkins <ci@libreoffice.org> Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
This commit is contained in:
Miklos Vajna
@@ -667,80 +667,197 @@ bool PDFDocument::Sign(const uno::Reference<security::XCertificate>& xCertificat
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m_aEditBuffer.WriteCharPtr(">>\nendobj\n\n");
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}
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// Write the xref table.
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sal_uInt64 nXRefOffset = m_aEditBuffer.Tell();
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m_aEditBuffer.WriteCharPtr("xref\n");
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for (const auto& rXRef : m_aXRef)
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{
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size_t nObject = rXRef.first;
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size_t nOffset = rXRef.second.m_nOffset;
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if (!rXRef.second.m_bDirty)
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continue;
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m_aEditBuffer.WriteUInt32AsString(nObject);
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m_aEditBuffer.WriteCharPtr(" 1\n");
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OStringBuffer aBuffer;
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aBuffer.append(static_cast<sal_Int32>(nOffset));
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while (aBuffer.getLength() < 10)
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aBuffer.insert(0, "0");
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if (nObject == 0)
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aBuffer.append(" 65535 f \n");
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else
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aBuffer.append(" 00000 n \n");
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m_aEditBuffer.WriteOString(aBuffer.toString());
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}
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// Write the trailer.
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m_aEditBuffer.WriteCharPtr("trailer\n<</Size ");
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m_aEditBuffer.WriteUInt32AsString(m_aXRef.size());
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m_aEditBuffer.WriteCharPtr("/Root ");
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m_aEditBuffer.WriteUInt32AsString(pRoot->GetObjectValue());
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m_aEditBuffer.WriteCharPtr(" ");
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m_aEditBuffer.WriteUInt32AsString(pRoot->GetGenerationValue());
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m_aEditBuffer.WriteCharPtr(" R\n");
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PDFReferenceElement* pInfo = nullptr;
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if (m_pXRefStream)
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pInfo = dynamic_cast<PDFReferenceElement*>(m_pXRefStream->Lookup("Info"));
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else
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pInfo = dynamic_cast<PDFReferenceElement*>(m_pTrailer->Lookup("Info"));
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if (pInfo)
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{
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m_aEditBuffer.WriteCharPtr("/Info ");
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m_aEditBuffer.WriteUInt32AsString(pInfo->GetObjectValue());
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m_aEditBuffer.WriteCharPtr(" ");
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m_aEditBuffer.WriteUInt32AsString(pInfo->GetGenerationValue());
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m_aEditBuffer.WriteCharPtr(" R\n");
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}
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PDFArrayElement* pID = nullptr;
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if (m_pXRefStream)
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pID = dynamic_cast<PDFArrayElement*>(m_pXRefStream->Lookup("ID"));
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else
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pID = dynamic_cast<PDFArrayElement*>(m_pTrailer->Lookup("ID"));
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if (pID)
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{
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const std::vector<PDFElement*>& rElements = pID->GetElements();
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m_aEditBuffer.WriteCharPtr("/ID [ <");
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for (size_t i = 0; i < rElements.size(); ++i)
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// Write the xref stream.
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// This is a bit meta: the xref stream stores its own offset.
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sal_Int32 nXRefStreamId = m_aXRef.size();
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XRefEntry aXRefStreamEntry;
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aXRefStreamEntry.m_nOffset = nXRefOffset;
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aXRefStreamEntry.m_bDirty = true;
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m_aXRef[nXRefStreamId] = aXRefStreamEntry;
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// Write stream data.
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SvMemoryStream aXRefStream;
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for (const auto& rXRef : m_aXRef)
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{
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auto pIDString = dynamic_cast<PDFHexStringElement*>(rElements[i]);
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if (!pIDString)
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const XRefEntry& rEntry = rXRef.second;
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if (!rEntry.m_bDirty)
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continue;
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m_aEditBuffer.WriteOString(pIDString->GetValue());
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if ((i + 1) < rElements.size())
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m_aEditBuffer.WriteCharPtr(">\n<");
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// First field.
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unsigned char nType = 0;
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switch (rEntry.m_eType)
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{
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case XRefEntryType::FREE:
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nType = 0;
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break;
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case XRefEntryType::NOT_COMPRESSED:
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nType = 1;
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break;
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case XRefEntryType::COMPRESSED:
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nType = 2;
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break;
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}
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aXRefStream.WriteUChar(nType);
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// Second field.
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const size_t nOffsetLen = 3;
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for (size_t i = 0; i < nOffsetLen; ++i)
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{
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size_t nByte = nOffsetLen - i - 1;
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// Fields requiring more than one byte are stored with the
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// high-order byte first.
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unsigned char nCh = (rEntry.m_nOffset & (0xff << (nByte * 8))) >> (nByte * 8);
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aXRefStream.WriteUChar(nCh);
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}
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// Third field.
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aXRefStream.WriteUChar(0);
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}
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m_aEditBuffer.WriteCharPtr("> ]\n");
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}
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if (!m_aStartXRefs.empty())
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m_aEditBuffer.WriteUInt32AsString(nXRefStreamId);
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m_aEditBuffer.WriteCharPtr(" 0 obj\n<<");
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// ID.
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auto pID = dynamic_cast<PDFArrayElement*>(m_pXRefStream->Lookup("ID"));
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if (pID)
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{
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const std::vector<PDFElement*>& rElements = pID->GetElements();
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m_aEditBuffer.WriteCharPtr("/ID [ <");
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for (size_t i = 0; i < rElements.size(); ++i)
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{
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auto pIDString = dynamic_cast<PDFHexStringElement*>(rElements[i]);
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if (!pIDString)
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continue;
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m_aEditBuffer.WriteOString(pIDString->GetValue());
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if ((i + 1) < rElements.size())
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m_aEditBuffer.WriteCharPtr("> <");
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}
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m_aEditBuffer.WriteCharPtr("> ] ");
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}
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// Index.
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m_aEditBuffer.WriteCharPtr("/Index [ ");
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for (const auto& rXRef : m_aXRef)
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{
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if (!rXRef.second.m_bDirty)
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continue;
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m_aEditBuffer.WriteUInt32AsString(rXRef.first);
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m_aEditBuffer.WriteCharPtr(" 1 ");
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}
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m_aEditBuffer.WriteCharPtr("] ");
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// Info.
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auto pInfo = dynamic_cast<PDFReferenceElement*>(m_pXRefStream->Lookup("Info"));
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if (pInfo)
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{
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m_aEditBuffer.WriteCharPtr("/Info ");
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m_aEditBuffer.WriteUInt32AsString(pInfo->GetObjectValue());
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m_aEditBuffer.WriteCharPtr(" ");
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m_aEditBuffer.WriteUInt32AsString(pInfo->GetGenerationValue());
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m_aEditBuffer.WriteCharPtr(" R ");
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}
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// Length.
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m_aEditBuffer.WriteCharPtr("/Length ");
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m_aEditBuffer.WriteUInt32AsString(aXRefStream.GetSize());
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if (!m_aStartXRefs.empty())
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{
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// Write location of the previous cross-reference section.
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m_aEditBuffer.WriteCharPtr("/Prev ");
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m_aEditBuffer.WriteUInt32AsString(m_aStartXRefs.back());
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}
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// Root.
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m_aEditBuffer.WriteCharPtr("/Root ");
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m_aEditBuffer.WriteUInt32AsString(pRoot->GetObjectValue());
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m_aEditBuffer.WriteCharPtr(" ");
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m_aEditBuffer.WriteUInt32AsString(pRoot->GetGenerationValue());
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m_aEditBuffer.WriteCharPtr(" R ");
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// Size.
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m_aEditBuffer.WriteCharPtr("/Size ");
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m_aEditBuffer.WriteUInt32AsString(m_aXRef.size());
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m_aEditBuffer.WriteCharPtr("/Type/XRef/W[1 3 1]>>\nstream\n");
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aXRefStream.Seek(0);
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m_aEditBuffer.WriteStream(aXRefStream);
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m_aEditBuffer.WriteCharPtr("\nendstream\nendobj\n\n");
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}
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else
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{
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// Write location of the previous cross-reference section.
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m_aEditBuffer.WriteCharPtr("/Prev ");
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m_aEditBuffer.WriteUInt32AsString(m_aStartXRefs.back());
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}
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// Write the xref table.
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m_aEditBuffer.WriteCharPtr("xref\n");
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for (const auto& rXRef : m_aXRef)
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{
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size_t nObject = rXRef.first;
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size_t nOffset = rXRef.second.m_nOffset;
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if (!rXRef.second.m_bDirty)
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continue;
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m_aEditBuffer.WriteCharPtr(">>\n");
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m_aEditBuffer.WriteUInt32AsString(nObject);
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m_aEditBuffer.WriteCharPtr(" 1\n");
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OStringBuffer aBuffer;
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aBuffer.append(static_cast<sal_Int32>(nOffset));
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while (aBuffer.getLength() < 10)
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aBuffer.insert(0, "0");
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if (nObject == 0)
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aBuffer.append(" 65535 f \n");
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else
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aBuffer.append(" 00000 n \n");
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m_aEditBuffer.WriteOString(aBuffer.toString());
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}
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// Write the trailer.
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m_aEditBuffer.WriteCharPtr("trailer\n<</Size ");
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m_aEditBuffer.WriteUInt32AsString(m_aXRef.size());
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m_aEditBuffer.WriteCharPtr("/Root ");
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m_aEditBuffer.WriteUInt32AsString(pRoot->GetObjectValue());
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m_aEditBuffer.WriteCharPtr(" ");
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m_aEditBuffer.WriteUInt32AsString(pRoot->GetGenerationValue());
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m_aEditBuffer.WriteCharPtr(" R\n");
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auto pInfo = dynamic_cast<PDFReferenceElement*>(m_pTrailer->Lookup("Info"));
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if (pInfo)
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{
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m_aEditBuffer.WriteCharPtr("/Info ");
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m_aEditBuffer.WriteUInt32AsString(pInfo->GetObjectValue());
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m_aEditBuffer.WriteCharPtr(" ");
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m_aEditBuffer.WriteUInt32AsString(pInfo->GetGenerationValue());
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m_aEditBuffer.WriteCharPtr(" R\n");
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}
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auto pID = dynamic_cast<PDFArrayElement*>(m_pTrailer->Lookup("ID"));
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if (pID)
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{
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const std::vector<PDFElement*>& rElements = pID->GetElements();
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m_aEditBuffer.WriteCharPtr("/ID [ <");
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for (size_t i = 0; i < rElements.size(); ++i)
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{
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auto pIDString = dynamic_cast<PDFHexStringElement*>(rElements[i]);
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if (!pIDString)
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continue;
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m_aEditBuffer.WriteOString(pIDString->GetValue());
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if ((i + 1) < rElements.size())
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m_aEditBuffer.WriteCharPtr(">\n<");
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}
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m_aEditBuffer.WriteCharPtr("> ]\n");
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}
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if (!m_aStartXRefs.empty())
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{
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// Write location of the previous cross-reference section.
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m_aEditBuffer.WriteCharPtr("/Prev ");
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m_aEditBuffer.WriteUInt32AsString(m_aStartXRefs.back());
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}
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m_aEditBuffer.WriteCharPtr(">>\n");
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}
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// Write startxref.
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m_aEditBuffer.WriteCharPtr("startxref\n");
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