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libreoffice/vcl/source/pdf/XmpMetadata.cxx
Daniel Baumann 8e63e14cf6
Adding upstream version 4:25.2.3. 
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-22 16:20:04 +02:00

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
*/
#include <sal/config.h>
#include <string_view>
#include <pdf/XmpMetadata.hxx>
#include <tools/XmlWriter.hxx>
namespace vcl::pdf
{
namespace
{
constexpr const char* constPadding = " "
" "
" "
" "
" "
"\n";
}
XmpMetadata::XmpMetadata()
: mbWritten(false)
, mnPDF_A(0)
, mbPDF_UA(false)
{
}
void XmpMetadata::write()
{
mpMemoryStream = std::make_unique<SvMemoryStream>(4096 /*Initial*/, 64 /*Resize*/);
// Header
mpMemoryStream->WriteOString(std::string_view(reinterpret_cast<char const*>(
u8"<?xpacket begin=\"\uFEFF\" id=\"W5M0MpCehiHzreSzNTczkc9d\"?>\n")));
{
tools::XmlWriter aXmlWriter(mpMemoryStream.get());
aXmlWriter.startDocument(2, false);
aXmlWriter.startElement("x"_ostr, "xmpmeta"_ostr, "adobe:ns:meta/"_ostr);
aXmlWriter.startElement("rdf"_ostr, "RDF"_ostr,
"http://www.w3.org/1999/02/22-rdf-syntax-ns#"_ostr);
// PDF/A part ( ISO 19005-1:2005 - 6.7.11 )
if (mnPDF_A > 0)
{
OString sPdfVersion = OString::number(mnPDF_A);
aXmlWriter.startElement("rdf:Description");
aXmlWriter.attribute("rdf:about", ""_ostr);
aXmlWriter.attribute("xmlns:pdfaid", "http://www.aiim.org/pdfa/ns/id/"_ostr);
aXmlWriter.startElement("pdfaid:part");
aXmlWriter.content(sPdfVersion);
aXmlWriter.endElement();
aXmlWriter.startElement("pdfaid:conformance");
aXmlWriter.content("B"_ostr);
aXmlWriter.endElement();
aXmlWriter.endElement();
}
// Dublin Core properties
if (!msTitle.isEmpty() || !msAuthor.isEmpty() || !msSubject.isEmpty()
|| !maContributor.empty() || !msCoverage.isEmpty() || !msIdentifier.isEmpty()
|| !maPublisher.empty() || !maRelation.empty() || !msRights.isEmpty()
|| !msSource.isEmpty() || !msType.isEmpty())
{
aXmlWriter.startElement("rdf:Description");
aXmlWriter.attribute("rdf:about", ""_ostr);
aXmlWriter.attribute("xmlns:dc", "http://purl.org/dc/elements/1.1/"_ostr);
aXmlWriter.startElement("dc:format");
aXmlWriter.content("application/pdf"_ostr);
aXmlWriter.endElement();
aXmlWriter.startElement("dc:date");
aXmlWriter.startElement("rdf:Seq");
aXmlWriter.startElement("rdf:li");
aXmlWriter.content(m_sCreateDate);
aXmlWriter.endElement();
aXmlWriter.endElement();
aXmlWriter.endElement();
if (!msTitle.isEmpty())
{
// this is according to PDF/A-1, technical corrigendum 1 (2007-04-01)
aXmlWriter.startElement("dc:title");
aXmlWriter.startElement("rdf:Alt");
aXmlWriter.startElement("rdf:li");
aXmlWriter.attribute("xml:lang", "x-default"_ostr);
aXmlWriter.content(msTitle);
aXmlWriter.endElement();
aXmlWriter.endElement();
aXmlWriter.endElement();
}
if (!msAuthor.isEmpty())
{
aXmlWriter.startElement("dc:creator");
aXmlWriter.startElement("rdf:Seq");
aXmlWriter.startElement("rdf:li");
aXmlWriter.content(msAuthor);
aXmlWriter.endElement();
aXmlWriter.endElement();
aXmlWriter.endElement();
}
if (!msSubject.isEmpty())
{
aXmlWriter.startElement("dc:description");
aXmlWriter.startElement("rdf:Alt");
aXmlWriter.startElement("rdf:li");
aXmlWriter.attribute("xml:lang", "x-default"_ostr);
aXmlWriter.content(msSubject);
aXmlWriter.endElement();
aXmlWriter.endElement();
aXmlWriter.endElement();
}
if (!maContributor.empty())
{
aXmlWriter.startElement("dc:contributor");
aXmlWriter.startElement("rdf:Bag");
for (const OString& rContributor : maContributor)
{
aXmlWriter.startElement("rdf:li");
aXmlWriter.content(rContributor);
aXmlWriter.endElement();
}
aXmlWriter.endElement();
aXmlWriter.endElement();
}
if (!msCoverage.isEmpty())
{
aXmlWriter.startElement("dc:coverage");
aXmlWriter.content(msCoverage);
aXmlWriter.endElement();
}
if (!msIdentifier.isEmpty())
{
aXmlWriter.startElement("dc:identifier");
aXmlWriter.content(msIdentifier);
aXmlWriter.endElement();
}
if (!maPublisher.empty())
{
aXmlWriter.startElement("dc:publisher");
aXmlWriter.startElement("rdf:Bag");
for (const OString& rPublisher : maPublisher)
{
aXmlWriter.startElement("rdf:li");
aXmlWriter.content(rPublisher);
aXmlWriter.endElement();
}
aXmlWriter.endElement();
aXmlWriter.endElement();
}
if (!maRelation.empty())
{
aXmlWriter.startElement("dc:relation");
aXmlWriter.startElement("rdf:Bag");
for (const OString& rRelation : maRelation)
{
aXmlWriter.startElement("rdf:li");
aXmlWriter.content(rRelation);
aXmlWriter.endElement();
}
aXmlWriter.endElement();
aXmlWriter.endElement();
}
if (!msRights.isEmpty())
{
aXmlWriter.startElement("dc:rights");
aXmlWriter.startElement("rdf:Alt");
aXmlWriter.startElement("rdf:li");
aXmlWriter.attribute("xml:lang", "x-default"_ostr);
aXmlWriter.content(msRights);
aXmlWriter.endElement();
aXmlWriter.endElement();
aXmlWriter.endElement();
}
if (!msSource.isEmpty())
{
aXmlWriter.startElement("dc:source");
aXmlWriter.content(msSource);
aXmlWriter.endElement();
}
if (!msType.isEmpty())
{
aXmlWriter.startElement("dc:type");
aXmlWriter.content(msType);
aXmlWriter.endElement();
}
aXmlWriter.endElement();
}
// PDF/UA
if (mbPDF_UA)
{
if (mnPDF_A != 0)
{ // tdf#157517 PDF/A extension schema is required
aXmlWriter.startElement("rdf:Description");
aXmlWriter.attribute("rdf:about", ""_ostr);
aXmlWriter.attribute("xmlns:pdfaExtension",
"http://www.aiim.org/pdfa/ns/extension/"_ostr);
aXmlWriter.attribute("xmlns:pdfaSchema",
"http://www.aiim.org/pdfa/ns/schema#"_ostr);
aXmlWriter.attribute("xmlns:pdfaProperty",
"http://www.aiim.org/pdfa/ns/property#"_ostr);
aXmlWriter.startElement("pdfaExtension:schemas");
aXmlWriter.startElement("rdf:Bag");
aXmlWriter.startElement("rdf:li");
aXmlWriter.attribute("rdf:parseType", "Resource"_ostr);
aXmlWriter.startElement("pdfaSchema:namespaceURI");
aXmlWriter.content("http://www.aiim.org/pdfua/ns/id/"_ostr);
aXmlWriter.endElement();
aXmlWriter.startElement("pdfaSchema:prefix");
aXmlWriter.content("pdfuaid"_ostr);
aXmlWriter.endElement();
aXmlWriter.startElement("pdfaSchema:schema");
aXmlWriter.content("PDF/UA identification schema"_ostr);
aXmlWriter.endElement();
aXmlWriter.startElement("pdfaSchema:property");
aXmlWriter.startElement("rdf:Seq");
aXmlWriter.startElement("rdf:li");
aXmlWriter.attribute("rdf:parseType", "Resource"_ostr);
aXmlWriter.startElement("pdfaProperty:category");
aXmlWriter.content("internal"_ostr);
aXmlWriter.endElement();
aXmlWriter.startElement("pdfaProperty:description");
aXmlWriter.content("PDF/UA version identifier"_ostr);
aXmlWriter.endElement();
aXmlWriter.startElement("pdfaProperty:name");
aXmlWriter.content("part"_ostr);
aXmlWriter.endElement();
aXmlWriter.startElement("pdfaProperty:valueType");
aXmlWriter.content("Integer"_ostr);
aXmlWriter.endElement();
aXmlWriter.endElement(); // rdf:li
aXmlWriter.startElement("rdf:li");
aXmlWriter.attribute("rdf:parseType", "Resource"_ostr);
aXmlWriter.startElement("pdfaProperty:category");
aXmlWriter.content("internal"_ostr);
aXmlWriter.endElement();
aXmlWriter.startElement("pdfaProperty:description");
aXmlWriter.content("PDF/UA amendment identifier"_ostr);
aXmlWriter.endElement();
aXmlWriter.startElement("pdfaProperty:name");
aXmlWriter.content("amd"_ostr);
aXmlWriter.endElement();
aXmlWriter.startElement("pdfaProperty:valueType");
aXmlWriter.content("Text"_ostr);
aXmlWriter.endElement();
aXmlWriter.endElement(); // rdf:li
aXmlWriter.startElement("rdf:li");
aXmlWriter.attribute("rdf:parseType", "Resource"_ostr);
aXmlWriter.startElement("pdfaProperty:category");
aXmlWriter.content("internal"_ostr);
aXmlWriter.endElement();
aXmlWriter.startElement("pdfaProperty:description");
aXmlWriter.content("PDF/UA corrigenda identifier"_ostr);
aXmlWriter.endElement();
aXmlWriter.startElement("pdfaProperty:name");
aXmlWriter.content("corr"_ostr);
aXmlWriter.endElement();
aXmlWriter.startElement("pdfaProperty:valueType");
aXmlWriter.content("Text"_ostr);
aXmlWriter.endElement();
aXmlWriter.endElement(); // rdf:li
aXmlWriter.endElement(); // rdf:Seq
aXmlWriter.endElement(); // pdfaSchema:property
aXmlWriter.endElement(); // rdf:li
aXmlWriter.endElement(); // rdf:Bag
aXmlWriter.endElement(); // pdfaExtension:schemas
aXmlWriter.endElement(); // rdf:Description
}
OString sPdfUaVersion = OString::number(1);
aXmlWriter.startElement("rdf:Description");
aXmlWriter.attribute("rdf:about", ""_ostr);
aXmlWriter.attribute("xmlns:pdfuaid", "http://www.aiim.org/pdfua/ns/id/"_ostr);
aXmlWriter.startElement("pdfuaid:part");
aXmlWriter.content(sPdfUaVersion);
aXmlWriter.endElement();
aXmlWriter.endElement();
}
// PDF properties
if (!msProducer.isEmpty() || !msKeywords.isEmpty() || !msPDFVersion.isEmpty())
{
aXmlWriter.startElement("rdf:Description");
aXmlWriter.attribute("rdf:about", ""_ostr);
aXmlWriter.attribute("xmlns:pdf", "http://ns.adobe.com/pdf/1.3/"_ostr);
if (!msProducer.isEmpty())
{
aXmlWriter.startElement("pdf:Producer");
aXmlWriter.content(msProducer);
aXmlWriter.endElement();
}
if (!msKeywords.isEmpty())
{
aXmlWriter.startElement("pdf:Keywords");
aXmlWriter.content(msKeywords);
aXmlWriter.endElement();
}
if (!msPDFVersion.isEmpty())
{
aXmlWriter.startElement("pdf:PDFVersion");
aXmlWriter.content(msPDFVersion);
aXmlWriter.endElement();
}
aXmlWriter.endElement();
}
// XMP Basic schema
aXmlWriter.startElement("rdf:Description");
aXmlWriter.attribute("rdf:about", ""_ostr);
aXmlWriter.attribute("xmlns:xmp", "http://ns.adobe.com/xap/1.0/"_ostr);
if (!m_sCreatorTool.isEmpty())
{
aXmlWriter.startElement("xmp:CreatorTool");
aXmlWriter.content(m_sCreatorTool);
aXmlWriter.endElement();
}
aXmlWriter.startElement("xmp:CreateDate");
aXmlWriter.content(m_sCreateDate);
aXmlWriter.endElement();
aXmlWriter.startElement("xmp:ModifyDate");
aXmlWriter.content(m_sCreateDate);
aXmlWriter.endElement();
aXmlWriter.startElement("xmp:MetadataDate");
aXmlWriter.content(m_sCreateDate);
aXmlWriter.endElement();
aXmlWriter.endElement();
aXmlWriter.endElement();
aXmlWriter.endElement();
aXmlWriter.endDocument();
}
// add padding (needed so the metadata can be changed in-place"
for (sal_Int32 nSpaces = 1; nSpaces <= 21; nSpaces++)
mpMemoryStream->WriteOString(constPadding);
mpMemoryStream->WriteOString("<?xpacket end=\"w\"?>\n");
mbWritten = true;
}
sal_uInt64 XmpMetadata::getSize()
{
if (!mbWritten)
write();
return mpMemoryStream->GetSize();
}
const void* XmpMetadata::getData()
{
if (!mbWritten)
write();
return mpMemoryStream->GetData();
}
} // end vcl::pdf
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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