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// Copyright 2016 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/fpdfapi/fpdf_parser/include/cpdf_indirect_object_holder.h"
#include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
#include "core/fpdfapi/fpdf_parser/include/cpdf_object.h"
#include "core/fpdfapi/fpdf_parser/include/cpdf_parser.h"
CPDF_IndirectObjectHolder::CPDF_IndirectObjectHolder(CPDF_Parser* pParser)
: m_pParser(pParser), m_LastObjNum(0) {
if (pParser)
m_LastObjNum = m_pParser->GetLastObjNum();
}
CPDF_IndirectObjectHolder::~CPDF_IndirectObjectHolder() {
for (const auto& pair : m_IndirectObjs)
pair.second->Destroy();
}
CPDF_Object* CPDF_IndirectObjectHolder::GetIndirectObject(uint32_t objnum) {
if (objnum == 0)
return nullptr;
CPDF_Object* result_obj = nullptr;
auto it = m_IndirectObjs.find(objnum);
if (it != m_IndirectObjs.end()) {
CPDF_Object* obj = it->second;
result_obj =
obj->GetObjNum() != CPDF_Object::kInvalidObjNum ? it->second : nullptr;
// Xref object is not used by the pdf document itself. Some software thus
// reuse an object number for xref object. So when we get an xref object,
// try again to see whether another object with the same number is defined.
// If so, use that object instead. See chromium:596947.
CPDF_Dictionary* dict =
obj->IsStream() ? obj->GetDict() : obj->AsDictionary();
if (!dict || dict->GetStringBy("Type") != "XRef")
return result_obj;
}
if (!m_pParser)
return nullptr;
CPDF_Object* pObj = m_pParser->ParseIndirectObject(this, objnum);
if (!pObj)
return result_obj;
pObj->m_ObjNum = objnum;
m_LastObjNum = std::max(m_LastObjNum, objnum);
if (m_IndirectObjs[objnum])
m_IndirectObjs[objnum]->Destroy();
m_IndirectObjs[objnum] = pObj;
return pObj;
}
uint32_t CPDF_IndirectObjectHolder::AddIndirectObject(CPDF_Object* pObj) {
if (pObj->m_ObjNum)
return pObj->m_ObjNum;
m_LastObjNum++;
m_IndirectObjs[m_LastObjNum] = pObj;
pObj->m_ObjNum = m_LastObjNum;
return m_LastObjNum;
}
void CPDF_IndirectObjectHolder::ReleaseIndirectObject(uint32_t objnum) {
auto it = m_IndirectObjs.find(objnum);
if (it == m_IndirectObjs.end() ||
it->second->GetObjNum() == CPDF_Object::kInvalidObjNum) {
return;
}
it->second->Destroy();
m_IndirectObjs.erase(it);
}
FX_BOOL CPDF_IndirectObjectHolder::InsertIndirectObject(uint32_t objnum,
CPDF_Object* pObj) {
if (!objnum || !pObj)
return FALSE;
auto it = m_IndirectObjs.find(objnum);
if (it != m_IndirectObjs.end()) {
if (pObj->GetGenNum() <= it->second->GetGenNum()) {
pObj->Destroy();
return FALSE;
}
it->second->Destroy();
}
pObj->m_ObjNum = objnum;
m_IndirectObjs[objnum] = pObj;
m_LastObjNum = std::max(m_LastObjNum, objnum);
return TRUE;
}
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