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// Copyright 2017 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 "core/fpdfdoc/cpdf_structelement.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_name.h"
#include "core/fpdfapi/parser/cpdf_number.h"
#include "core/fpdfapi/parser/cpdf_object.h"
#include "core/fpdfapi/parser/cpdf_reference.h"
#include "core/fpdfapi/parser/cpdf_stream.h"
#include "core/fpdfdoc/cpdf_structtree.h"
#include "third_party/base/stl_util.h"
CPDF_StructKid::CPDF_StructKid()
: m_Type(Invalid),
m_pDict(nullptr),
m_PageObjNum(0),
m_RefObjNum(0),
m_ContentId(0) {}
CPDF_StructKid::CPDF_StructKid(const CPDF_StructKid& that) = default;
CPDF_StructKid::~CPDF_StructKid() = default;
CPDF_StructElement::CPDF_StructElement(CPDF_StructTree* pTree,
CPDF_StructElement* pParent,
CPDF_Dictionary* pDict)
: m_pTree(pTree),
m_pParent(pParent),
m_pDict(pDict),
m_Type(pDict->GetStringFor("S")),
m_Title(pDict->GetStringFor("T")) {
if (pTree->GetRoleMap()) {
CFX_ByteString mapped = pTree->GetRoleMap()->GetStringFor(m_Type);
if (!mapped.IsEmpty())
m_Type = mapped;
}
LoadKids(pDict);
}
CPDF_StructElement::~CPDF_StructElement() = default;
int CPDF_StructElement::CountKids() const {
return pdfium::CollectionSize<int>(m_Kids);
}
CPDF_StructElement* CPDF_StructElement::GetKidIfElement(int index) const {
return m_Kids[index].m_Type == CPDF_StructKid::Element
? m_Kids[index].m_pElement.Get()
: nullptr;
}
void CPDF_StructElement::LoadKids(CPDF_Dictionary* pDict) {
CPDF_Object* pObj = pDict->GetObjectFor("Pg");
uint32_t PageObjNum = 0;
if (CPDF_Reference* pRef = ToReference(pObj))
PageObjNum = pRef->GetRefObjNum();
CPDF_Object* pKids = pDict->GetDirectObjectFor("K");
if (!pKids)
return;
m_Kids.clear();
if (CPDF_Array* pArray = pKids->AsArray()) {
m_Kids.resize(pArray->GetCount());
for (uint32_t i = 0; i < pArray->GetCount(); i++) {
CPDF_Object* pKid = pArray->GetDirectObjectAt(i);
LoadKid(PageObjNum, pKid, &m_Kids[i]);
}
return;
}
m_Kids.resize(1);
LoadKid(PageObjNum, pKids, &m_Kids[0]);
}
void CPDF_StructElement::LoadKid(uint32_t PageObjNum,
CPDF_Object* pKidObj,
CPDF_StructKid* pKid) {
pKid->m_Type = CPDF_StructKid::Invalid;
if (!pKidObj)
return;
if (pKidObj->IsNumber()) {
if (m_pTree->GetPage() && m_pTree->GetPage()->GetObjNum() != PageObjNum)
return;
pKid->m_Type = CPDF_StructKid::PageContent;
pKid->m_ContentId = pKidObj->GetInteger();
pKid->m_PageObjNum = PageObjNum;
return;
}
CPDF_Dictionary* pKidDict = pKidObj->AsDictionary();
if (!pKidDict)
return;
if (CPDF_Reference* pRef = ToReference(pKidDict->GetObjectFor("Pg")))
PageObjNum = pRef->GetRefObjNum();
CFX_ByteString type = pKidDict->GetStringFor("Type");
if ((type == "MCR" || type == "OBJR") && m_pTree->GetPage() &&
m_pTree->GetPage()->GetObjNum() != PageObjNum) {
return;
}
if (type == "MCR") {
pKid->m_Type = CPDF_StructKid::StreamContent;
CPDF_Reference* pRef = ToReference(pKidDict->GetObjectFor("Stm"));
pKid->m_RefObjNum = pRef ? pRef->GetRefObjNum() : 0;
pKid->m_PageObjNum = PageObjNum;
pKid->m_ContentId = pKidDict->GetIntegerFor("MCID");
return;
}
if (type == "OBJR") {
pKid->m_Type = CPDF_StructKid::Object;
CPDF_Reference* pObj = ToReference(pKidDict->GetObjectFor("Obj"));
pKid->m_RefObjNum = pObj ? pObj->GetRefObjNum() : 0;
pKid->m_PageObjNum = PageObjNum;
return;
}
pKid->m_Type = CPDF_StructKid::Element;
pKid->m_pDict = pKidDict;
if (m_pTree->GetPage()) {
pKid->m_pElement = nullptr;
return;
}
pKid->m_pElement =
pdfium::MakeRetain<CPDF_StructElement>(m_pTree.Get(), this, pKidDict);
}
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