vcl/source/pdf/XmpMetadata.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  */
  10
  11 #include <pdf/XmpMetadata.hxx>
  12 #include <tools/XmlWriter.hxx>
  13
  14 namespace vcl::pdf
  15 {
  16 namespace
  17 {
  18 constexpr const char* constPadding = "                                        "
  19                                      "                                        "
  20                                      "                                        "
  21                                      "                                        "
  22                                      "                                        "
  23                                      "\n";
  24 }
  25
  26 XmpMetadata::XmpMetadata()
  27     : mbWritten(false)
  28     , mnPDF_A(0)
  29     , mbPDF_UA(false)
  30 {
  31 }
  32
  33 void XmpMetadata::write()
  34 {
  35     mpMemoryStream = std::make_unique<SvMemoryStream>(4096 /*Initial*/, 64 /*Resize*/);
  36
  37     // Header
  38     mpMemoryStream->WriteOString("<?xpacket begin=\"");
  39     mpMemoryStream->WriteOString(OUStringToOString(OUString(u'\xFEFF'), RTL_TEXTENCODING_UTF8));
  40     mpMemoryStream->WriteOString("\" id=\"W5M0MpCehiHzreSzNTczkc9d\"?>\n");
  41
  42     {
  43         tools::XmlWriter aXmlWriter(mpMemoryStream.get());
  44         aXmlWriter.startDocument(2, false);
  45         aXmlWriter.startElement("x", "xmpmeta", "adobe:ns:meta/");
  46         aXmlWriter.startElement("rdf", "RDF", "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
  47
  48         // PDF/A part ( ISO 19005-1:2005 - 6.7.11 )
  49         if (mnPDF_A > 0)
  50         {
  51             OString sPdfVersion = OString::number(mnPDF_A);
  52             OString sPdfConformance = (mnPDF_A == 1) ? "A" : "B";
  53
  54             aXmlWriter.startElement("rdf:Description");
  55             aXmlWriter.attribute("rdf:about", OString(""));
  56             aXmlWriter.attribute("xmlns:pdfaid", OString("http://www.aiim.org/pdfa/ns/id/"));
  57
  58             aXmlWriter.startElement("pdfaid:part");
  59             aXmlWriter.content(sPdfVersion);
  60             aXmlWriter.endElement();
  61
  62             aXmlWriter.startElement("pdfaid:conformance");
  63             aXmlWriter.content(sPdfConformance);
  64             aXmlWriter.endElement();
  65
  66             aXmlWriter.endElement();
  67         }
  68
  69         // Dublin Core properties
  70         if (!msTitle.isEmpty() || !msAuthor.isEmpty() || !msSubject.isEmpty())
  71         {
  72             aXmlWriter.startElement("rdf:Description");
  73             aXmlWriter.attribute("rdf:about", OString(""));
  74             aXmlWriter.attribute("xmlns:dc", OString("http://purl.org/dc/elements/1.1/"));
  75             if (!msTitle.isEmpty())
  76             {
  77                 // this is according to PDF/A-1, technical corrigendum 1 (2007-04-01)
  78                 aXmlWriter.startElement("dc:title");
  79                 aXmlWriter.startElement("rdf:Alt");
  80                 aXmlWriter.startElement("rdf:li");
  81                 aXmlWriter.attribute("xml:lang", OString("x-default"));
  82                 aXmlWriter.content(msTitle);
  83                 aXmlWriter.endElement();
  84                 aXmlWriter.endElement();
  85                 aXmlWriter.endElement();
  86             }
  87             if (!msAuthor.isEmpty())
  88             {
  89                 aXmlWriter.startElement("dc:creator");
  90                 aXmlWriter.startElement("rdf:Seq");
  91                 aXmlWriter.startElement("rdf:li");
  92                 aXmlWriter.content(msAuthor);
  93                 aXmlWriter.endElement();
  94                 aXmlWriter.endElement();
  95                 aXmlWriter.endElement();
  96             }
  97             if (!msSubject.isEmpty())
  98             {
  99                 aXmlWriter.startElement("dc:description");
 100                 aXmlWriter.startElement("rdf:Alt");
 101                 aXmlWriter.startElement("rdf:li");
 102                 aXmlWriter.attribute("xml:lang", OString("x-default"));
 103                 aXmlWriter.content(msSubject);
 104                 aXmlWriter.endElement();
 105                 aXmlWriter.endElement();
 106                 aXmlWriter.endElement();
 107             }
 108             aXmlWriter.endElement();
 109         }
 110
 111         // PDF/UA
 112         if (mbPDF_UA)
 113         {
 114             OString sPdfUaVersion = OString::number(1);
 115             aXmlWriter.startElement("rdf:Description");
 116             aXmlWriter.attribute("rdf:about", OString(""));
 117             aXmlWriter.attribute("xmlns:pdfuaid", OString("http://www.aiim.org/pdfua/ns/id/"));
 118
 119             aXmlWriter.startElement("pdfuaid:part");
 120             aXmlWriter.content(sPdfUaVersion);
 121             aXmlWriter.endElement();
 122
 123             aXmlWriter.endElement();
 124         }
 125
 126         // PDF properties
 127         if (!msProducer.isEmpty() || !msKeywords.isEmpty())
 128         {
 129             aXmlWriter.startElement("rdf:Description");
 130             aXmlWriter.attribute("rdf:about", OString(""));
 131             aXmlWriter.attribute("xmlns:pdf", OString("http://ns.adobe.com/pdf/1.3/"));
 132             if (!msProducer.isEmpty())
 133             {
 134                 aXmlWriter.startElement("pdf:Producer");
 135                 aXmlWriter.content(msProducer);
 136                 aXmlWriter.endElement();
 137             }
 138             if (!msKeywords.isEmpty())
 139             {
 140                 aXmlWriter.startElement("pdf:Keywords");
 141                 aXmlWriter.content(msKeywords);
 142                 aXmlWriter.endElement();
 143             }
 144             aXmlWriter.endElement();
 145         }
 146
 147         // XMP Basic schema
 148         aXmlWriter.startElement("rdf:Description");
 149         aXmlWriter.attribute("rdf:about", OString(""));
 150         aXmlWriter.attribute("xmlns:xmp", OString("http://ns.adobe.com/xap/1.0/"));
 151         if (!m_sCreatorTool.isEmpty())
 152         {
 153             aXmlWriter.startElement("xmp:CreatorTool");
 154             aXmlWriter.content(m_sCreatorTool);
 155             aXmlWriter.endElement();
 156         }
 157         aXmlWriter.startElement("xmp:CreateDate");
 158         aXmlWriter.content(m_sCreateDate);
 159         aXmlWriter.endElement();
 160         aXmlWriter.endElement();
 161
 162         aXmlWriter.endElement();
 163         aXmlWriter.endElement();
 164         aXmlWriter.endDocument();
 165     }
 166
 167     // add padding (needed so the metadata can be changed in-place"
 168     for (sal_Int32 nSpaces = 1; nSpaces <= 21; nSpaces++)
 169         mpMemoryStream->WriteOString(constPadding);
 170
 171     mpMemoryStream->WriteOString("<?xpacket end=\"w\"?>\n");
 172     mbWritten = true;
 173 }
 174
 175 sal_uInt64 XmpMetadata::getSize()
 176 {
 177     if (!mbWritten)
 178         write();
 179     return mpMemoryStream->GetSize();
 180 }
 181
 182 const void* XmpMetadata::getData()
 183 {
 184     if (!mbWritten)
 185         write();
 186     return mpMemoryStream->GetData();
 187 }
 188
 189 } // end vcl::pdf
 190
 191 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */