| // 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_object.h" |
| #include "core/fpdfapi/fpdf_parser/include/cpdf_parser.h" |
| |
| CPDF_IndirectObjectHolder::CPDF_IndirectObjectHolder() : m_LastObjNum(0) {} |
| |
| CPDF_IndirectObjectHolder::~CPDF_IndirectObjectHolder() { |
| for (const auto& pair : m_IndirectObjs) |
| pair.second->Destroy(); |
| } |
| |
| CPDF_Object* CPDF_IndirectObjectHolder::GetIndirectObject( |
| uint32_t objnum) const { |
| if (objnum == 0) |
| return nullptr; |
| |
| auto it = m_IndirectObjs.find(objnum); |
| return it != m_IndirectObjs.end() ? it->second : nullptr; |
| } |
| |
| CPDF_Object* CPDF_IndirectObjectHolder::ParseIndirectObject(uint32_t objnum) { |
| return nullptr; |
| } |
| |
| CPDF_Object* CPDF_IndirectObjectHolder::GetOrParseIndirectObject( |
| uint32_t objnum) { |
| CPDF_Object* pObj = GetIndirectObject(objnum); |
| if (pObj) |
| return pObj->GetObjNum() != CPDF_Object::kInvalidObjNum ? pObj : nullptr; |
| |
| pObj = ParseIndirectObject(objnum); |
| if (!pObj) |
| return nullptr; |
| |
| pObj->m_ObjNum = objnum; |
| ReplaceIndirectObject(pObj); |
| return pObj; |
| } |
| |
| uint32_t CPDF_IndirectObjectHolder::AddIndirectObject(CPDF_Object* pObj) { |
| if (pObj->m_ObjNum) |
| return pObj->m_ObjNum; |
| |
| m_LastObjNum++; |
| pObj->m_ObjNum = m_LastObjNum; |
| ReplaceIndirectObject(pObj); |
| return m_LastObjNum; |
| } |
| |
| void CPDF_IndirectObjectHolder::ReleaseIndirectObject(uint32_t objnum) { |
| CPDF_Object* pObj = GetIndirectObject(objnum); |
| if (!pObj || pObj->m_ObjNum == CPDF_Object::kInvalidObjNum) |
| return; |
| |
| pObj->Destroy(); |
| m_IndirectObjs.erase(objnum); |
| } |
| |
| bool CPDF_IndirectObjectHolder::ReplaceIndirectObjectIfHigherGeneration( |
| uint32_t objnum, |
| CPDF_Object* pObj) { |
| if (!objnum || !pObj) |
| return false; |
| |
| CPDF_Object* pOldObj = GetIndirectObject(objnum); |
| if (pOldObj && pObj->GetGenNum() <= pOldObj->GetGenNum()) { |
| pObj->Destroy(); |
| return false; |
| } |
| |
| pObj->m_ObjNum = objnum; |
| ReplaceIndirectObject(pObj); |
| return true; |
| } |
| |
| void CPDF_IndirectObjectHolder::ReplaceIndirectObject(CPDF_Object* pObj) { |
| m_LastObjNum = std::max(m_LastObjNum, pObj->m_ObjNum); |
| if (m_IndirectObjs[pObj->m_ObjNum]) |
| m_IndirectObjs[pObj->m_ObjNum]->Destroy(); |
| |
| m_IndirectObjs[pObj->m_ObjNum] = pObj; |
| } |