vcl/inc/pdf/ExternalPDFStreams.hxx

   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 #pragma once
  11
  12 #include <sal/types.h>
  13 #include <sal/log.hxx>
  14 #include <vcl/dllapi.h>
  15
  16 #include <map>
  17 #include <vector>
  18 #include <memory>
  19
  20 #include <vcl/filter/pdfdocument.hxx>
  21 #include <vcl/BinaryDataContainer.hxx>
  22
  23 namespace vcl
  24 {
  25 // A external PDF stream, which stores the PDF stream data as byte array.
  26 // This struct is also responsible to parsing the stream as a PDFDocument,
  27 // and store its instance for the life-cycle of the struct, so that it
  28 // reused to avoid unnecessary parsing.
  29 struct VCL_DLLPUBLIC ExternalPDFStream
  30 {
  31     BinaryDataContainer maDataContainer;
  32     std::shared_ptr<filter::PDFDocument> mpPDFDocument;
  33     std::map<sal_Int32, sal_Int32> maCopiedResources;
  34
  35     std::map<sal_Int32, sal_Int32>& getCopiedResources() { return maCopiedResources; }
  36
  37     std::shared_ptr<filter::PDFDocument>& getPDFDocument()
  38     {
  39         if (!mpPDFDocument)
  40         {
  41             std::shared_ptr<SvStream> aPDFStream = maDataContainer.getAsStream();
  42             auto pPDFDocument = std::make_shared<filter::PDFDocument>();
  43             if (!pPDFDocument->ReadWithPossibleFixup(*aPDFStream))
  44             {
  45                 SAL_WARN("vcl.pdfwriter",
  46                          "PDFWriterImpl::writeReferenceXObject: reading the PDF document failed");
  47             }
  48             else
  49             {
  50                 mpPDFDocument = std::move(pPDFDocument);
  51             }
  52         }
  53         return mpPDFDocument;
  54     }
  55 };
  56
  57 // Class to manage external PDF streams, for the de-duplication purpose.
  58 class ExternalPDFStreams
  59 {
  60 private:
  61     std::map<std::vector<sal_uInt8>, sal_Int32> maStreamIndexMap;
  62     std::vector<ExternalPDFStream> maStreamList;
  63
  64 public:
  65     ExternalPDFStreams() {}
  66
  67     sal_Int32 store(BinaryDataContainer const& rDataContainer);
  68
  69     ExternalPDFStream& get(sal_uInt32 nIndex);
  70 };
  71 }
  72
  73 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */