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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "public/fpdf_ppo.h"
#include <map>
#include <memory>
#include <utility>
#include <vector>
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_document.h"
#include "core/fpdfapi/parser/cpdf_name.h"
#include "core/fpdfapi/parser/cpdf_number.h"
#include "core/fpdfapi/parser/cpdf_reference.h"
#include "core/fpdfapi/parser/cpdf_stream.h"
#include "core/fpdfapi/parser/cpdf_string.h"
#include "fpdfsdk/fsdk_define.h"
#include "third_party/base/ptr_util.h"
#include "third_party/base/stl_util.h"
namespace {
CPDF_Object* PageDictGetInheritableTag(CPDF_Dictionary* pDict,
const CFX_ByteString& bsSrcTag) {
if (!pDict || bsSrcTag.IsEmpty())
return nullptr;
if (!pDict->KeyExist("Parent") || !pDict->KeyExist("Type"))
return nullptr;
CPDF_Object* pType = pDict->GetObjectFor("Type")->GetDirect();
if (!ToName(pType))
return nullptr;
if (pType->GetString().Compare("Page"))
return nullptr;
CPDF_Dictionary* pp =
ToDictionary(pDict->GetObjectFor("Parent")->GetDirect());
if (!pp)
return nullptr;
if (pDict->KeyExist(bsSrcTag))
return pDict->GetObjectFor(bsSrcTag);
while (pp) {
if (pp->KeyExist(bsSrcTag))
return pp->GetObjectFor(bsSrcTag);
if (!pp->KeyExist("Parent"))
break;
pp = ToDictionary(pp->GetObjectFor("Parent")->GetDirect());
}
return nullptr;
}
bool CopyInheritable(CPDF_Dictionary* pCurPageDict,
CPDF_Dictionary* pSrcPageDict,
const CFX_ByteString& key) {
if (pCurPageDict->KeyExist(key))
return true;
CPDF_Object* pInheritable = PageDictGetInheritableTag(pSrcPageDict, key);
if (!pInheritable)
return false;
pCurPageDict->SetFor(key, pInheritable->Clone());
return true;
}
bool ParserPageRangeString(CFX_ByteString rangstring,
std::vector<uint16_t>* pageArray,
int nCount) {
if (rangstring.IsEmpty())
return true;
rangstring.Remove(' ');
int nLength = rangstring.GetLength();
CFX_ByteString cbCompareString("0123456789-,");
for (int i = 0; i < nLength; ++i) {
if (cbCompareString.Find(rangstring[i]) == -1)
return false;
}
CFX_ByteString cbMidRange;
int nStringFrom = 0;
int nStringTo = 0;
while (nStringTo < nLength) {
nStringTo = rangstring.Find(',', nStringFrom);
if (nStringTo == -1)
nStringTo = nLength;
cbMidRange = rangstring.Mid(nStringFrom, nStringTo - nStringFrom);
int nMid = cbMidRange.Find('-');
if (nMid == -1) {
long lPageNum = atol(cbMidRange.c_str());
if (lPageNum <= 0 || lPageNum > nCount)
return false;
pageArray->push_back((uint16_t)lPageNum);
} else {
int nStartPageNum = atol(cbMidRange.Mid(0, nMid).c_str());
if (nStartPageNum == 0)
return false;
++nMid;
int nEnd = cbMidRange.GetLength() - nMid;
if (nEnd == 0)
return false;
int nEndPageNum = atol(cbMidRange.Mid(nMid, nEnd).c_str());
if (nStartPageNum < 0 || nStartPageNum > nEndPageNum ||
nEndPageNum > nCount) {
return false;
}
for (int i = nStartPageNum; i <= nEndPageNum; ++i) {
pageArray->push_back(i);
}
}
nStringFrom = nStringTo + 1;
}
return true;
}
} // namespace
class CPDF_PageOrganizer {
public:
CPDF_PageOrganizer(CPDF_Document* pDestPDFDoc, CPDF_Document* pSrcPDFDoc);
~CPDF_PageOrganizer();
bool PDFDocInit();
bool ExportPage(const std::vector<uint16_t>& pageNums, int nIndex);
private:
using ObjectNumberMap = std::map<uint32_t, uint32_t>;
bool UpdateReference(CPDF_Object* pObj, ObjectNumberMap* pObjNumberMap);
uint32_t GetNewObjId(ObjectNumberMap* pObjNumberMap, CPDF_Reference* pRef);
CPDF_Document* m_pDestPDFDoc;
CPDF_Document* m_pSrcPDFDoc;
};
CPDF_PageOrganizer::CPDF_PageOrganizer(CPDF_Document* pDestPDFDoc,
CPDF_Document* pSrcPDFDoc)
: m_pDestPDFDoc(pDestPDFDoc), m_pSrcPDFDoc(pSrcPDFDoc) {}
CPDF_PageOrganizer::~CPDF_PageOrganizer() {}
bool CPDF_PageOrganizer::PDFDocInit() {
ASSERT(m_pDestPDFDoc);
ASSERT(m_pSrcPDFDoc);
CPDF_Dictionary* pNewRoot = m_pDestPDFDoc->GetRoot();
if (!pNewRoot)
return false;
CPDF_Dictionary* pDocInfoDict = m_pDestPDFDoc->GetInfo();
if (!pDocInfoDict)
return false;
pDocInfoDict->SetNewFor<CPDF_String>("Producer", "PDFium", false);
CFX_ByteString cbRootType = pNewRoot->GetStringFor("Type", "");
if (cbRootType.IsEmpty())
pNewRoot->SetNewFor<CPDF_Name>("Type", "Catalog");
CPDF_Object* pElement = pNewRoot->GetObjectFor("Pages");
CPDF_Dictionary* pNewPages =
pElement ? ToDictionary(pElement->GetDirect()) : nullptr;
if (!pNewPages) {
pNewPages = m_pDestPDFDoc->NewIndirect<CPDF_Dictionary>();
pNewRoot->SetNewFor<CPDF_Reference>("Pages", m_pDestPDFDoc,
pNewPages->GetObjNum());
}
CFX_ByteString cbPageType = pNewPages->GetStringFor("Type", "");
if (cbPageType.IsEmpty())
pNewPages->SetNewFor<CPDF_Name>("Type", "Pages");
if (!pNewPages->GetArrayFor("Kids")) {
pNewPages->SetNewFor<CPDF_Number>("Count", 0);
pNewPages->SetNewFor<CPDF_Reference>(
"Kids", m_pDestPDFDoc,
m_pDestPDFDoc->NewIndirect<CPDF_Array>()->GetObjNum());
}
return true;
}
bool CPDF_PageOrganizer::ExportPage(const std::vector<uint16_t>& pageNums,
int nIndex) {
int curpage = nIndex;
auto pObjNumberMap = pdfium::MakeUnique<ObjectNumberMap>();
int nSize = pdfium::CollectionSize<int>(pageNums);
for (int i = 0; i < nSize; ++i) {
CPDF_Dictionary* pCurPageDict = m_pDestPDFDoc->CreateNewPage(curpage);
CPDF_Dictionary* pSrcPageDict = m_pSrcPDFDoc->GetPage(pageNums[i] - 1);
if (!pSrcPageDict || !pCurPageDict)
return false;
// Clone the page dictionary
for (const auto& it : *pSrcPageDict) {
const CFX_ByteString& cbSrcKeyStr = it.first;
if (cbSrcKeyStr == "Type" || cbSrcKeyStr == "Parent")
continue;
CPDF_Object* pObj = it.second.get();
pCurPageDict->SetFor(cbSrcKeyStr, pObj->Clone());
}
// inheritable item
// Even though some entries are required by the PDF spec, there exist
// PDFs that omit them. Set some defaults in this case.
// 1 MediaBox - required
if (!CopyInheritable(pCurPageDict, pSrcPageDict, "MediaBox")) {
// Search for "CropBox" in the source page dictionary.
// If it does not exist, use the default letter size.
CPDF_Object* pInheritable =
PageDictGetInheritableTag(pSrcPageDict, "CropBox");
if (pInheritable) {
pCurPageDict->SetFor("MediaBox", pInheritable->Clone());
} else {
// Make the default size letter size (8.5"x11")
CPDF_Array* pArray = pCurPageDict->SetNewFor<CPDF_Array>("MediaBox");
pArray->AddNew<CPDF_Number>(0);
pArray->AddNew<CPDF_Number>(0);
pArray->AddNew<CPDF_Number>(612);
pArray->AddNew<CPDF_Number>(792);
}
}
// 2 Resources - required
if (!CopyInheritable(pCurPageDict, pSrcPageDict, "Resources")) {
// Use a default empty resources if it does not exist.
pCurPageDict->SetNewFor<CPDF_Dictionary>("Resources");
}
// 3 CropBox - optional
CopyInheritable(pCurPageDict, pSrcPageDict, "CropBox");
// 4 Rotate - optional
CopyInheritable(pCurPageDict, pSrcPageDict, "Rotate");
// Update the reference
uint32_t dwOldPageObj = pSrcPageDict->GetObjNum();
uint32_t dwNewPageObj = pCurPageDict->GetObjNum();
(*pObjNumberMap)[dwOldPageObj] = dwNewPageObj;
UpdateReference(pCurPageDict, pObjNumberMap.get());
++curpage;
}
return true;
}
bool CPDF_PageOrganizer::UpdateReference(CPDF_Object* pObj,
ObjectNumberMap* pObjNumberMap) {
switch (pObj->GetType()) {
case CPDF_Object::REFERENCE: {
CPDF_Reference* pReference = pObj->AsReference();
uint32_t newobjnum = GetNewObjId(pObjNumberMap, pReference);
if (newobjnum == 0)
return false;
pReference->SetRef(m_pDestPDFDoc, newobjnum);
break;
}
case CPDF_Object::DICTIONARY: {
CPDF_Dictionary* pDict = pObj->AsDictionary();
auto it = pDict->begin();
while (it != pDict->end()) {
const CFX_ByteString& key = it->first;
CPDF_Object* pNextObj = it->second.get();
++it;
if (key == "Parent" || key == "Prev" || key == "First")
continue;
if (!pNextObj)
return false;
if (!UpdateReference(pNextObj, pObjNumberMap))
pDict->RemoveFor(key);
}
break;
}
case CPDF_Object::ARRAY: {
CPDF_Array* pArray = pObj->AsArray();
for (size_t i = 0; i < pArray->GetCount(); ++i) {
CPDF_Object* pNextObj = pArray->GetObjectAt(i);
if (!pNextObj)
return false;
if (!UpdateReference(pNextObj, pObjNumberMap))
return false;
}
break;
}
case CPDF_Object::STREAM: {
CPDF_Stream* pStream = pObj->AsStream();
CPDF_Dictionary* pDict = pStream->GetDict();
if (!pDict)
return false;
if (!UpdateReference(pDict, pObjNumberMap))
return false;
break;
}
default:
break;
}
return true;
}
uint32_t CPDF_PageOrganizer::GetNewObjId(ObjectNumberMap* pObjNumberMap,
CPDF_Reference* pRef) {
if (!pRef)
return 0;
uint32_t dwObjnum = pRef->GetRefObjNum();
uint32_t dwNewObjNum = 0;
const auto it = pObjNumberMap->find(dwObjnum);
if (it != pObjNumberMap->end())
dwNewObjNum = it->second;
if (dwNewObjNum)
return dwNewObjNum;
CPDF_Object* pDirect = pRef->GetDirect();
if (!pDirect)
return 0;
std::unique_ptr<CPDF_Object> pClone = pDirect->Clone();
if (CPDF_Dictionary* pDictClone = pClone->AsDictionary()) {
if (pDictClone->KeyExist("Type")) {
CFX_ByteString strType = pDictClone->GetStringFor("Type");
if (!FXSYS_stricmp(strType.c_str(), "Pages"))
return 4;
if (!FXSYS_stricmp(strType.c_str(), "Page"))
return 0;
}
}
CPDF_Object* pUnownedClone =
m_pDestPDFDoc->AddIndirectObject(std::move(pClone));
dwNewObjNum = pUnownedClone->GetObjNum();
(*pObjNumberMap)[dwObjnum] = dwNewObjNum;
if (!UpdateReference(pUnownedClone, pObjNumberMap))
return 0;
return dwNewObjNum;
}
DLLEXPORT FPDF_BOOL STDCALL FPDF_ImportPages(FPDF_DOCUMENT dest_doc,
FPDF_DOCUMENT src_doc,
FPDF_BYTESTRING pagerange,
int index) {
CPDF_Document* pDestDoc = CPDFDocumentFromFPDFDocument(dest_doc);
if (!dest_doc)
return false;
CPDF_Document* pSrcDoc = CPDFDocumentFromFPDFDocument(src_doc);
if (!pSrcDoc)
return false;
std::vector<uint16_t> pageArray;
int nCount = pSrcDoc->GetPageCount();
if (pagerange) {
if (!ParserPageRangeString(pagerange, &pageArray, nCount))
return false;
} else {
for (int i = 1; i <= nCount; ++i) {
pageArray.push_back(i);
}
}
CPDF_PageOrganizer pageOrg(pDestDoc, pSrcDoc);
return pageOrg.PDFDocInit() && pageOrg.ExportPage(pageArray, index);
}
DLLEXPORT FPDF_BOOL STDCALL FPDF_CopyViewerPreferences(FPDF_DOCUMENT dest_doc,
FPDF_DOCUMENT src_doc) {
CPDF_Document* pDstDoc = CPDFDocumentFromFPDFDocument(dest_doc);
if (!pDstDoc)
return false;
CPDF_Document* pSrcDoc = CPDFDocumentFromFPDFDocument(src_doc);
if (!pSrcDoc)
return false;
CPDF_Dictionary* pSrcDict = pSrcDoc->GetRoot();
pSrcDict = pSrcDict->GetDictFor("ViewerPreferences");
if (!pSrcDict)
return false;
CPDF_Dictionary* pDstDict = pDstDoc->GetRoot();
if (!pDstDict)
return false;
pDstDict->SetFor("ViewerPreferences", pSrcDict->CloneDirectObject());
return true;
}